chore(variables): update version and build number to 0.2.2 and 7 respectively

Every settings update answered with a bare success, so the console could not
tell a change that took effect at once from one written to the file that the
running program would keep ignoring until it was restarted — the listener
address, the storage paths, the Komari dashboard URL.

Classify the patch instead. config.RestartRequiredKeys expands a patch into the
dot-separated paths of its leaves and intersects them with the settings main
reads before it starts serving, and the settings endpoint returns that list as
data.restartRequired. It is a pure function of the patch, so UpdateSettings
keeps its signature and nothing else has to change; the write succeeds either
way, and the field only says which edits are not live.

Matching is by overlap rather than equality, so a patch that names a section —
replacing it, or deleting it with a null — reports the startup-only keys inside
it, while a sibling subtree like webhook.endpoints is not mistaken for
webhook.enabled.

The result is never nil, so an update with nothing to report serializes as []
rather than null and a client can iterate it without a guard.

The console reads the field in ConfigSection and warns instead of confirming,
naming the keys that are pending; Settings.vue's hints for the Komari URL, the
listen address and the storage paths now say which of their fields is affected
rather than labelling the whole card.

.gitignore

@@ -6,6 +6,10 @@ bot_node_config.json
 *.exe
 nukumizu-linux-amd64
 
+# Scratch test files dropped in the repo root stay untracked; the real suite
+# lives next to the code it covers (config/, handler/, ...) and is tracked.
+/*test.go
+
 # The built web console. web/embed.go compiles it into the binary, and the
 # build-*.sh / build-*.bat scripts rebuild it before every compile.
 /web/dist/

README.md

@@ -77,9 +77,9 @@ nukumizu-backend/
 │           ├── email.go          # Email notification pipe
 │           ├── ntfy.go           # ntfy notification pipe
 │           ├── webhook.go        # Outgoing webhook notification pipe
-│           ├── qq_napcat/
+│           ├── qq_onebot/
 │           │   ├── qq.go         # QQ (NapCat / OneBot 11) bot controller
-│           │   └── napcat.go     # NapCat WebSocket + HTTP API client
+│           │   └── onebot.go     # OneBot 11 WebSocket client (events + API)
 │           └── telegram/
 │               ├── telegram.go   # Telegram bot controller (go-telegram/bot, long polling)
 │               └── send.go       # Message sending / splitting (Telegram Markdown)
@@ -101,7 +101,7 @@ nukumizu-backend/
 - Go **1.25** or newer
 - [Node.js](https://nodejs.org) **22** or newer — only needed to build the web console; a prebuilt binary does not require it
 - A running [Komari](https://www.komari.wiki) Dashboard instance reachable from this host
-- For QQ: a [NapCat](https://napneko.github.io/) instance exposing an OneBot 11 WebSocket + HTTP endpoint
+- For QQ: a [NapCat](https://napneko.github.io/) instance exposing an OneBot 11 forward WebSocket endpoint (`/api` and `/event`)
 - For Telegram: a bot token from [@BotFather](https://t.me/BotFather)
 
 Key dependencies: `github.com/go-telegram/bot`, `github.com/gorilla/websocket`, `gopkg.in/mail.v2`, `modernc.org/sqlite`.
@@ -218,7 +218,7 @@ There are two configuration files, both read from the working directory unless o
 
 Field notes:
 
-- `system.networkProxy` is a **system-wide** proxy URL. A controller only uses it when its own `networkUseProxy` is `true`. Applied to Telegram HTTP polling, NapCat HTTP/WebSocket, ntfy and webhook requests, and Email SMTP (tunneled via HTTP CONNECT).
+- `system.networkProxy` is a **system-wide** proxy URL. A controller only uses it when its own `networkUseProxy` is `true`. Applied to Telegram HTTP polling, QQ OneBot WebSocket, ntfy and webhook requests, and Email SMTP (tunneled via HTTP CONNECT).
 - `webhook` configures the **incoming** webhook API (see [Incoming webhook API](#incoming-webhook-api)); `controllerMethod.webhook` configures the outgoing webhook notification channel. They are independent.
 - `markdown` is a per-channel switch on all five channels. With it `false` (the default) every rendered value is inserted as plain text; with it `true` the values meant to be read verbatim (UUIDs, event messages, commands, command results, alert source and alert content) are wrapped in Markdown code spans / fenced blocks. Nothing is inferred from the channel name, so a channel only ever gets the formatting you asked for — turn it off for a channel whose platform does not render Markdown. On Telegram it also picks the `parse_mode`: with `markdown` off, messages are sent without one, so text containing `*` or `_` is delivered as-is rather than rejected by the API as malformed Markdown.
 - `controllerMethod.qq(napcat).listenMethod` / `telegram.listenMethod` — see [Bot recognition modes](#bot-recognition-modes).
@@ -294,6 +294,18 @@ Admins and trusted groups are defined **per bot channel** and map a member ID to
 | `{{ list.offlineServers }}` | Formatted list of offline servers |
 | `{{ softwareVersion }}`, `{{ softwareBuildVer }}`, `{{ softwareCommitHash }}`, `{{ softwareBuildType }}`, `{{ softwareBuildTime }}`, `{{ softwareDeveloper }}`, `{{ softwareDescription }}` | Build metadata (commit hash and build time are injected at compile time) |
 
+### What applies without a restart
+
+Saving settings applies most of them immediately. How each group takes effect:
+
+| Settings | How it applies |
+|---|---|
+| `controllerMethod` (all five channels) | Every channel is **rebuilt**: the running controllers are stopped and a fresh set is built from the new settings. A channel that owns a connection reconnects — Telegram re-runs its `getMe` handshake, NapCat opens a new WebSocket — so notifications sent during the swap are lost. The rebuild only happens when this section actually changed; saving a message template does not disturb the channels. |
+| `controllerMessage`, `debug`, `bot_user_config.json`, `bot_node_config.json`, `webhook.endpoints` | Picked up as they are used; nothing is restarted. |
+| `system.debugMode` | Applies to both behavior and log filtering. |
+| `system.networkProxy` | Read on every request and every dial, so a new address reaches channels that are already running. Only the per-channel `networkUseProxy` opt-in is fixed when a channel is built, so toggling that still needs the rebuild above. |
+| `system.listenAddr` / `listenPort`, `webhook.enabled` / `listenAddr` / `listenPort`, `dataPath`, `dbPath`, `komari.dashboardURL` | **Applied at startup only.** Saving them changes the file and the in-memory configuration but not the running listener, database or Komari client — restart to apply. |
+
 ## API
 
 Success responses follow the envelope `{"success": true, "message": "...", "data": {...}}`, with the payload nested under a single `data` key. Error responses use `{"success": false, "message": "..."}`. `message` may be omitted on success when there is nothing to report.
@@ -322,7 +334,7 @@ Browser WebSocket handshakes cannot carry custom headers, so `/api/system/getLog
 | `/api/server/getStatus` | GET | admin | Live server status (mirrors the Bot's `/status`). Query `?uuid=<uuid>` (or `all`). Returns `data: {<uuid>: {uuid, name, online, report}}`; `report` is `null` when the node has not reported yet. `404` for an unknown single uuid. |
 | `/api/server/exec` | POST | bot / admin | Execute a command. Body `{uuid: [<uuid>...], command}`. Dispatches a Komari task and polls until completion (or timeout). Returns `data: {taskID, results}`. |
 | `/api/settings/get` | GET | admin | `?type=global\|bot_user_config\|bot_node_config` | Returns `data: {config}`, where `config` is the selected config file's content (same layout as the JSON file). |
-| `/api/settings/set` | POST | admin | `?type=<same types>` + JSON body of partial updates, e.g. `{"system":{"debugMode":true}}` | Deep-merges the body into the selected config file, persists it, and reloads it in memory. Only the given keys change; arrays replace. |
+| `/api/settings/set` | POST | admin | `?type=<same types>` + JSON body of partial updates, e.g. `{"system":{"debugMode":true}}` | Deep-merges the body into the selected config file, persists it, and reloads it in memory. Only the given keys change; arrays replace. Returns `data: {type, restartRequired}`, where `restartRequired` lists the keys the update changed that are only read at startup (see [What applies without a restart](#what-applies-without-a-restart)) — the write succeeds regardless, this only says which edits are not live yet. Always an array, empty when everything took effect. |
 | `/api/webhook/add` | POST | admin | Add an incoming webhook endpoint. Body `{name, enabled?, token?, notifyPipes?}` — only the fields given are stored, the rest start at their defaults. `409` when the name is already configured. |
 | `/api/webhook/modify` | POST | admin | Change an existing endpoint. Body `{name, ...}` — the fields given are the fields that change (same partial-update rule as `/api/settings/set`, but scoped to one endpoint). `404` for an unknown name, `400` when no other field is given. |
 | `/api/webhook/delete` | POST | admin | Remove an endpoint. Body `{name}`. `404` for an unknown name. |
@@ -375,7 +387,7 @@ Status codes: `200` delivered, `400` malformed body or empty `subject`/`content`
 
 ## Bots
 
-QQ (NapCat) and Telegram bots share one command engine and authorization pipeline, implemented in `internal/controller/`. NapCat speaks OneBot 11 (WebSocket event stream + HTTP actions); Telegram uses `go-telegram/bot` long polling.
+QQ (NapCat) and Telegram bots share one command engine and authorization pipeline, implemented in `internal/controller/`. NapCat speaks OneBot 11 over WebSocket (event stream + actions); Telegram uses `go-telegram/bot` long polling.
 
 ### Permission model
 

changeLogs.md

@@ -1,3 +1,13 @@
+## Ver.0.2.1.6-d06d0bc.pre-release
+### Features
+- Most of settings now support hot reload when changed
+  - [Network proxy]("https://gitea.nanami.tech/NanamiAdmin/Nukumizu/commit/457ea424178b397f5509578d6180da437aaed075")
+  - [Controllers]("https://gitea.nanami.tech/NanamiAdmin/Nukumizu/commit/2a5a46a9846c5afe8ac3c66dc42164ddea25c038")
+- [Only log node count when it changed]("https://gitea.nanami.tech/NanamiAdmin/Nukumizu/commit/aa7e7f87e17f17ff2f64aa1823a00a291628d4eb")
+
+### Bug Fixes
+- [Resolve the proxy address per request]("https://gitea.nanami.tech/NanamiAdmin/Nukumizu/commit/457ea424178b397f5509578d6180da437aaed075")
+
 ## Ver.0.2.0.5-661cf08.pre-release
 ### Features
 - [Enhance security of websocket log system]("https://gitea.nanami.tech/NanamiAdmin/Nukumizu/commit/da467c9297e641e2ab9a1889252589503791b7e9")

config/concurrency_test.go

@@ -0,0 +1,164 @@
+package config
+
+import (
+	"sync"
+	"testing"
+
+	"nukumizu-backend/global"
+)
+
+// TestConcurrentReloadAndRead drives every configuration accessor from reader
+// goroutines while UpdateSettings and SaveBotNodeConfig replace the in-memory
+// configurations underneath them. Run with -race to check that the swap is
+// race-free: before the singletons were published through atomic pointers this
+// pattern was an unsynchronized read of a variable written by LoadGlobalConfig
+// and friends, which the race detector reports.
+//
+// The readers call the accessors the way production code does — take the value
+// and use it immediately, never store it — because that is what keeps a reader
+// pinned to one complete version of the configuration.
+func TestConcurrentReloadAndRead(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{
+    "system": {
+        "debugMode": true,
+        "listenPort": "8080"
+    },
+    "webhook": {
+        "endpoints": {
+            "example": { "enabled": true, "token": "t", "notifyPipes": ["ntfy"] }
+        }
+    },
+    "controllerMessage": {
+        "BOT_STARTED": "hello"
+    }
+}`)
+	writeTempConfig(t, &global.ConfigPath.BotUserConfig, `{
+    "qq(napcat)": {
+        "admins": { "1": { "event_reply": true } },
+        "trustedGroups": { "2": { "event_status_notify": true } }
+    }
+}`)
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, `{
+    "node-1": { "enableStatusNotify": true }
+}`)
+
+	// Seed every singleton so the readers start from a loaded configuration
+	// rather than racing the first store.
+	if _, err := LoadGlobalConfig(global.ConfigPath.Global); err != nil {
+		t.Fatalf("LoadGlobalConfig: %v", err)
+	}
+	if _, err := LoadBotUserConfig(global.ConfigPath.BotUserConfig); err != nil {
+		t.Fatalf("LoadBotUserConfig: %v", err)
+	}
+	if err := LoadBotNodeConfig(global.ConfigPath.BotNodeConfig); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+
+	const readers = 4
+	const rounds = 40
+
+	var readersWg, writersWg sync.WaitGroup
+	stop := make(chan struct{})
+
+	for i := 0; i < readers; i++ {
+		readersWg.Add(1)
+		go func() {
+			defer readersWg.Done()
+			for {
+				select {
+				case <-stop:
+					return
+				default:
+				}
+				if cfg := Current(); cfg != nil {
+					_ = cfg.System.DebugMode
+					_ = cfg.System.ListenPort
+					_ = cfg.ControllerMessage.BotStarted
+					_ = cfg.Webhook.Endpoints
+				}
+				if users := BotUsers(); users != nil {
+					_ = users.QQ.Admins.IDs()
+					_ = users.QQ.TrustedGroups.IDs()
+				}
+				_ = BotNodes()
+				_ = IsDebugMode()
+				_ = NodeStatusNotifyEnabled("node-1")
+				_ = WebhookEndpoints()
+				_, _ = GetWebhookEndpoint("example")
+			}
+		}()
+	}
+
+	// Writer: reloads the global and bot user configurations, and rewrites the
+	// node registry through UpdateSettings so its reload runs too.
+	writersWg.Add(1)
+	go func() {
+		defer writersWg.Done()
+		for i := 0; i < rounds; i++ {
+			enabled := i%2 == 0
+			patch := map[string]interface{}{
+				"system": map[string]interface{}{"debugMode": enabled},
+				"controllerMessage": map[string]interface{}{
+					"BOT_STARTED": "hello",
+				},
+			}
+			if err := UpdateSettings(SettingGlobal, patch); err != nil {
+				t.Errorf("UpdateSettings(global): %v", err)
+				return
+			}
+			if err := UpdateSettings(SettingBotUserConfig, map[string]interface{}{
+				"qq(napcat)": map[string]interface{}{
+					"admins": map[string]interface{}{
+						"1": map[string]interface{}{"event_reply": enabled},
+					},
+				},
+			}); err != nil {
+				t.Errorf("UpdateSettings(bot_user_config): %v", err)
+				return
+			}
+			if err := UpdateSettings(SettingBotNodeConfig, map[string]interface{}{
+				"node-2": map[string]interface{}{"enableStatusNotify": enabled},
+			}); err != nil {
+				t.Errorf("UpdateSettings(bot_node_config): %v", err)
+				return
+			}
+		}
+	}()
+
+	// Second writer: the node tracker's background save, which shares the same
+	// read-modify-write lock as the admin edits above.
+	writersWg.Add(1)
+	go func() {
+		defer writersWg.Done()
+		for i := 0; i < rounds; i++ {
+			if err := SaveBotNodeConfig(global.ConfigPath.BotNodeConfig, []string{"node-1", "node-2"}); err != nil {
+				t.Errorf("SaveBotNodeConfig: %v", err)
+				return
+			}
+		}
+	}()
+
+	// Let the writers finish, then release the readers. Waiting on the readers
+	// first would deadlock: they only return once stop is closed.
+	writersWg.Wait()
+	close(stop)
+	readersWg.Wait()
+
+	// The last write must be visible: the accessors are not allowed to serve a
+	// stale configuration once UpdateSettings has returned.
+	if err := UpdateSettings(SettingGlobal, map[string]interface{}{
+		"system": map[string]interface{}{"debugMode": true},
+	}); err != nil {
+		t.Fatalf("final UpdateSettings(global): %v", err)
+	}
+	cfg := Current()
+	if cfg == nil {
+		t.Fatal("Current() is nil after a successful reload")
+	}
+	if !cfg.System.DebugMode {
+		t.Error("Current() did not observe the reloaded debugMode")
+	}
+	if cfg.System.ListenPort != "8080" {
+		t.Errorf("reload dropped an untouched sibling: listenPort = %q", cfg.System.ListenPort)
+	}
+}

config/config.go

@@ -5,19 +5,20 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"time"
 )
 
 // LoadBotNodeConfig reads and parses bot_node_config.json and stores it as the
 // global C_botNodeConfig singleton, mirroring LoadGlobalConfig. Unlike the
 // other config files this one is auto-generated and optional: a missing or
-// empty file yields an empty map, so every node falls back to its default
+// empty file yields an empty map, so every node falls back to its defaults —
-// enableStatusNotify value (true).
+// enableStatusNotify true and flap_tolerant 0 (no flap inhibition).
 func LoadBotNodeConfig(configPath string) error {
 	cfg := BotNodeMembers{}
 	data, err := os.ReadFile(configPath)
 	if err != nil {
 		if os.IsNotExist(err) {
-			C_botNodeConfig = cfg
+			botNodeConfig.Store(&cfg)
 			return nil
 		}
 		return fmt.Errorf("failed to read bot node config file: %w", err)
@@ -27,25 +28,44 @@ func LoadBotNodeConfig(configPath string) error {
 			return fmt.Errorf("failed to parse bot node config file: %w", err)
 		}
 	}
-	C_botNodeConfig = cfg
+	botNodeConfig.Store(&cfg)
 	return nil
 }
 
 // NodeStatusNotifyEnabled reports whether the node identified by uuid should
 // broadcast status-change notifications, per bot_node_config.json.
 // enableStatusNotify defaults to true: a node notifies unless its entry
-// explicitly sets the flag to false.
+// explicitly sets the flag to false. A missing configuration (nil map) yields
+// the same default.
 func NodeStatusNotifyEnabled(uuid string) bool {
-	if C_botNodeConfig == nil {
+	opts, ok := BotNodes()[uuid]
-		return true
-	}
-	opts, ok := C_botNodeConfig[uuid]
 	if !ok || opts.EnableStatusNotify == nil {
 		return true
 	}
 	return *opts.EnableStatusNotify
 }
 
+// maxFlapTolerantSeconds bounds the flap-inhibition window so an absurd
+// hand-written value cannot overflow time.Duration.
+const maxFlapTolerantSeconds = 86400
+
+// NodeFlapTolerant returns how long an Offline notification for uuid should be
+// held in order to absorb a quick reconnect, per bot_node_config.json's
+// flap_tolerant. It returns 0 (inhibition disabled) when the node has no entry,
+// the value is zero or negative, or the config has not been loaded — in every
+// case the caller falls back to notifying immediately.
+func NodeFlapTolerant(uuid string) time.Duration {
+	opts, ok := BotNodes()[uuid]
+	if !ok || opts.FlapTolerant <= 0 {
+		return 0
+	}
+	seconds := opts.FlapTolerant
+	if seconds > maxFlapTolerantSeconds {
+		seconds = maxFlapTolerantSeconds
+	}
+	return time.Duration(seconds * float64(time.Second))
+}
+
 // LoadGlobalConfig reads and parses the configuration file, applies defaults,
 // and stores it as a global singleton.
 func LoadGlobalConfig(configPath string) (*Config, error) {
@@ -67,15 +87,15 @@ func LoadGlobalConfig(configPath string) (*Config, error) {
 		cfg.System.ListenPort = "8080"
 	}
 
-	// Apply defaults for QQ controller.
+	// Apply defaults for QQ_OneBot controller.
-	if cfg.ControllerMethod.QQ.ListenMethod == "" {
+	if cfg.ControllerMethod.QQ_OneBot.ListenMethod == "" {
-		cfg.ControllerMethod.QQ.ListenMethod = "global"
+		cfg.ControllerMethod.QQ_OneBot.ListenMethod = "global"
 	}
-	if cfg.ControllerMethod.QQ.NapcatAddr == "" {
+	if cfg.ControllerMethod.QQ_OneBot.OneBotAddr == "" {
-		cfg.ControllerMethod.QQ.NapcatAddr = "127.0.0.1"
+		cfg.ControllerMethod.QQ_OneBot.OneBotAddr = "127.0.0.1"
 	}
-	if cfg.ControllerMethod.QQ.NapcatPort == "" {
+	if cfg.ControllerMethod.QQ_OneBot.OneBotPort == "" {
-		cfg.ControllerMethod.QQ.NapcatPort = "3000"
+		cfg.ControllerMethod.QQ_OneBot.OneBotPort = "3000"
 	}
 
 	// Apply defaults for Telegram controller.
@@ -146,7 +166,7 @@ func LoadGlobalConfig(configPath string) (*Config, error) {
 		cfg.ControllerMessage.ServerExecuteResult = "Command execute result:\nServer Name: {{ serverName }}\nCommand: {{ command }}\n***Result***\n\n{{ result }}\n\n************\nTime: {{ time }}"
 	}
 
-	C_globalConfig = &cfg
+	globalConfig.Store(&cfg)
 	return &cfg, nil
 }
 
@@ -162,7 +182,7 @@ func LoadBotUserConfig(configPath string) (*BotUserConfig, error) {
 	if err := json.Unmarshal(data, &cfg); err != nil {
 		return nil, fmt.Errorf("failed to parse bot user config file: %w", err)
 	}
-	C_botUserConfig = &cfg
+	botUserConfig.Store(&cfg)
 	return &cfg, nil
 }
 
@@ -170,7 +190,8 @@ func LoadBotUserConfig(configPath string) (*BotUserConfig, error) {
 // which is a plain registry of the nodes Komari reports (read back at startup
 // by LoadBotNodeConfig). Entries already present are always preserved: a UUID
 // Komari no longer reports on a given fetch is kept rather than deleted, and
-// any enableStatusNotify a user set by hand is left untouched. UUIDs seen for
+// any per-node option a user set by hand — enableStatusNotify or flap_tolerant
+// — is left untouched. UUIDs seen for
 // the first time are added as an empty object, i.e. no parameter is written, so
 // they inherit the enableStatusNotify default (true). The resulting JSON has
 // its object keys emitted in sorted order by encoding/json, keeping the file
@@ -213,8 +234,9 @@ func SaveBotNodeConfig(configPath string, uuids []string) error {
 
 // IsDebugMode returns whether debug mode is enabled.
 func IsDebugMode() bool {
-	if C_globalConfig == nil {
+	cfg := Current()
+	if cfg == nil {
 		return false
 	}
-	return C_globalConfig.System.DebugMode
+	return cfg.System.DebugMode
 }

config/flap_test.go

@@ -0,0 +1,140 @@
+package config
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"nukumizu-backend/global"
+)
+
+// TestNodeFlapTolerant covers the flap-inhibition window accessor against the
+// per-node options in bot_node_config.json, including the hand-written values
+// the comment on BotNodeOptions.FlapTolerant promises to accept.
+func TestNodeFlapTolerant(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, `{
+    "seconds": { "flap_tolerant": 30 },
+    "fractional": { "flap_tolerant": 2.5 },
+    "zero": { "flap_tolerant": 0 },
+    "negative": { "flap_tolerant": -5 },
+    "unset": { "enableStatusNotify": true },
+    "absurd": { "flap_tolerant": 1e9 },
+    "throughput": { "flap_tolerant": 8, "enableStatusNotify": false }
+}`)
+	if err := LoadBotNodeConfig(global.ConfigPath.BotNodeConfig); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+
+	cases := []struct {
+		name string
+		uuid string
+		want time.Duration
+	}{
+		{"whole seconds", "seconds", 30 * time.Second},
+		{"fractional seconds parse", "fractional", 2500 * time.Millisecond},
+		{"zero disables", "zero", 0},
+		{"negative disables", "negative", 0},
+		{"absent field disables", "unset", 0},
+		{"unknown node disables", "not-in-the-file", 0},
+		{"absurd value is clamped", "absurd", maxFlapTolerantSeconds * time.Second},
+		{"independent of enableStatusNotify", "throughput", 8 * time.Second},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := NodeFlapTolerant(tc.uuid); got != tc.want {
+				t.Errorf("NodeFlapTolerant(%q) = %v, want %v", tc.uuid, got, tc.want)
+			}
+		})
+	}
+}
+
+// TestNodeFlapTolerantWithoutConfig pins the nil-safe default: before any
+// bot_node_config.json has been loaded — and for a file that is missing or
+// empty — no node has a window, so notifications keep their previous
+// notify-immediately behavior.
+func TestNodeFlapTolerantWithoutConfig(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, ``)
+	if err := LoadBotNodeConfig(global.ConfigPath.BotNodeConfig); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+
+	if got := NodeFlapTolerant("anything"); got != 0 {
+		t.Errorf("node flap tolerance from an empty file = %v, want 0", got)
+	}
+}
+
+// nodeEntry reads one node's raw object back from the settings file, the way
+// GetSettings serves it to the console.
+func nodeEntry(t *testing.T, uuid string) map[string]interface{} {
+	t.Helper()
+	data, err := GetSettings(SettingBotNodeConfig)
+	if err != nil {
+		t.Fatalf("GetSettings: %v", err)
+	}
+	var all map[string]map[string]interface{}
+	if err := json.Unmarshal(data, &all); err != nil {
+		t.Fatalf("unmarshal settings: %v", err)
+	}
+	return all[uuid]
+}
+
+// TestFlapTolerantSettingsRoundTrip drives the payload the console's node card
+// actually posts — { "<uuid>": { "flap_tolerant": <seconds> } } — through the
+// settings API, so the frontend and the accessor are checked against each other
+// and not just against hand-written files.
+func TestFlapTolerantSettingsRoundTrip(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, `{
+    "node-a": { "enableStatusNotify": false }
+}`)
+	if err := LoadBotNodeConfig(global.ConfigPath.BotNodeConfig); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+
+	patch := map[string]interface{}{
+		"node-a": map[string]interface{}{"flap_tolerant": 30},
+	}
+	if err := UpdateSettings(SettingBotNodeConfig, patch); err != nil {
+		t.Fatalf("UpdateSettings: %v", err)
+	}
+
+	if got := NodeFlapTolerant("node-a"); got != 30*time.Second {
+		t.Errorf("NodeFlapTolerant after save = %v, want 30s", got)
+	}
+	// The sibling option must survive: the card saves only the field it edits.
+	entry := nodeEntry(t, "node-a")
+	if entry["enableStatusNotify"] != false {
+		t.Errorf("enableStatusNotify = %v, want it preserved as false", entry["enableStatusNotify"])
+	}
+	if entry["flap_tolerant"] != float64(30) {
+		t.Errorf("flap_tolerant on disk = %v, want 30", entry["flap_tolerant"])
+	}
+}
+
+// TestFlapTolerantSettingsRemoval: clearing the console's field sends a JSON
+// null, which must remove the key rather than leave an explicit 0 behind.
+func TestFlapTolerantSettingsRemoval(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, `{
+    "node-a": { "enableStatusNotify": true, "flap_tolerant": 30 }
+}`)
+	if err := LoadBotNodeConfig(global.ConfigPath.BotNodeConfig); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+
+	patch := map[string]interface{}{
+		"node-a": map[string]interface{}{"flap_tolerant": nil},
+	}
+	if err := UpdateSettings(SettingBotNodeConfig, patch); err != nil {
+		t.Fatalf("UpdateSettings: %v", err)
+	}
+
+	if got := NodeFlapTolerant("node-a"); got != 0 {
+		t.Errorf("NodeFlapTolerant after removal = %v, want 0", got)
+	}
+	entry := nodeEntry(t, "node-a")
+	if _, present := entry["flap_tolerant"]; present {
+		t.Error("flap_tolerant is still in the file after being cleared")
+	}
+	if entry["enableStatusNotify"] != true {
+		t.Errorf("enableStatusNotify = %v, want it preserved as true", entry["enableStatusNotify"])
+	}
+}

config/reload.go

@@ -0,0 +1,81 @@
+package config
+
+import (
+	"fmt"
+	"sync"
+
+	"nukumizu-backend/postLog"
+)
+
+// reloadHooks are the callbacks run after the global configuration has been
+// reloaded, i.e. after every settings update that touches config.json.
+//
+// They exist so that packages which already depend on config — the controller
+// manager, the logger — can react to an update without config importing them,
+// which would be an import cycle. Everything a hook needs is passed in.
+var (
+	reloadHooksMu sync.Mutex
+	reloadHooks   []func(*Config)
+
+	// reloadRunMu serializes hook execution. A hook mutates process-wide state
+	// — the logger's debug flag, the controller registry — so two overlapping
+	// settings updates must not run them at the same time, or both would decide
+	// to rebuild the controllers from their own view of what was applied.
+	reloadRunMu sync.Mutex
+)
+
+// OnReload registers a hook to run after every reload of the global
+// configuration, receiving the configuration now in effect. Hooks run in
+// registration order.
+//
+// Register once, at startup, before the first settings update can arrive: a
+// hook registered later has already missed the updates that came before it, and
+// the configuration it would have seen is not replayed.
+//
+// A hook runs on the goroutine serving /api/settings/set, so it must not block
+// for long. It may be called concurrently by two overlapping updates.
+func OnReload(hook func(*Config)) {
+	reloadHooksMu.Lock()
+	defer reloadHooksMu.Unlock()
+	reloadHooks = append(reloadHooks, hook)
+}
+
+// notifyReload runs every registered hook with cfg. A nil cfg is the signal
+// that the update touched one of the other settings files, which have no
+// hook-visible reload, and it is ignored.
+//
+// A panicking hook is logged and skipped rather than allowed to unwind through
+// UpdateSettings: by the time hooks run the new configuration is already on
+// disk and published in memory, so reporting the write as failed would be a
+// lie, and the hooks registered after the broken one must still run.
+func notifyReload(cfg *Config) {
+	if cfg == nil {
+		return
+	}
+
+	// Copy under the registry lock, then release it before running anything: a
+	// hook is free to register another hook without deadlocking.
+	reloadHooksMu.Lock()
+	hooks := make([]func(*Config), len(reloadHooks))
+	copy(hooks, reloadHooks)
+	reloadHooksMu.Unlock()
+
+	reloadRunMu.Lock()
+	defer reloadRunMu.Unlock()
+	for _, hook := range hooks {
+		runReloadHook(hook, cfg)
+	}
+}
+
+// runReloadHook runs one hook, isolating a panic to that hook. Recovering in a
+// separate function rather than inline is deliberate: a deferred recover placed
+// in the loop body would not run until notifyReload itself returned, which
+// would abandon the remaining hooks.
+func runReloadHook(hook func(*Config), cfg *Config) {
+	defer func() {
+		if r := recover(); r != nil {
+			postLog.Error(fmt.Sprintf("Configuration reload hook panicked: %v", r))
+		}
+	}()
+	hook(cfg)
+}

config/reload_test.go

@@ -0,0 +1,173 @@
+package config
+
+import (
+	"reflect"
+	"testing"
+
+	"nukumizu-backend/global"
+)
+
+// swapReloadHooks replaces the registered reload hooks for the duration of a
+// test and restores the previous set afterwards, so the package-level registry
+// cannot leak into another test.
+func swapReloadHooks(t *testing.T, hooks ...func(*Config)) {
+	t.Helper()
+
+	reloadHooksMu.Lock()
+	original := reloadHooks
+	reloadHooks = hooks
+	reloadHooksMu.Unlock()
+
+	t.Cleanup(func() {
+		reloadHooksMu.Lock()
+		reloadHooks = original
+		reloadHooksMu.Unlock()
+	})
+}
+
+func TestReloadHookRunsOnlyForGlobalSettings(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{"system":{"debugMode":false}}`)
+	writeTempConfig(t, &global.ConfigPath.BotUserConfig, `{}`)
+	writeTempConfig(t, &global.ConfigPath.BotNodeConfig, `{}`)
+
+	var seen []bool
+	swapReloadHooks(t, func(cfg *Config) {
+		seen = append(seen, cfg.System.DebugMode)
+	})
+
+	// A config.json update runs the hook, with the values just written.
+	if err := UpdateSettings(SettingGlobal, map[string]interface{}{
+		"system": map[string]interface{}{"debugMode": true},
+	}); err != nil {
+		t.Fatalf("UpdateSettings(global): %v", err)
+	}
+
+	if len(seen) != 1 {
+		t.Fatalf("hook ran %d times for a config.json update, want 1", len(seen))
+	}
+	if !seen[0] {
+		t.Error("hook received a configuration without the updated debugMode")
+	}
+
+	// The other two files reload a singleton that callers read at the point of
+	// use, so they have nothing to notify.
+	for _, settingsType := range []string{SettingBotUserConfig, SettingBotNodeConfig} {
+		if err := UpdateSettings(settingsType, map[string]interface{}{
+			"unused": map[string]interface{}{"event_reply": true},
+		}); err != nil {
+			t.Fatalf("UpdateSettings(%s): %v", settingsType, err)
+		}
+	}
+
+	if len(seen) != 1 {
+		t.Errorf("hook ran %d times after updates to the other settings files, want 1", len(seen))
+	}
+}
+
+func TestReloadHookIsolatesPanic(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{"system":{"debugMode":false}}`)
+
+	reached := false
+	swapReloadHooks(t,
+		func(*Config) { panic("hook under test") },
+		func(*Config) { reached = true },
+	)
+
+	// The configuration is already on disk and published by the time hooks run,
+	// so a broken hook must not turn a successful write into a failed request.
+	if err := UpdateSettings(SettingGlobal, map[string]interface{}{
+		"system": map[string]interface{}{"debugMode": true},
+	}); err != nil {
+		t.Fatalf("a panicking hook must not fail the settings write: %v", err)
+	}
+	if !reached {
+		t.Error("a panicking hook stopped the hooks registered after it")
+	}
+
+	// The write itself must still have landed.
+	cfg := Current()
+	if cfg == nil || !cfg.System.DebugMode {
+		t.Error("the settings write did not take effect")
+	}
+}
+
+// TestUnrelatedUpdateLeavesControllerMethodAlone guards the trigger for a
+// controller rebuild. Whether to rebuild is decided by comparing the whole
+// controllerMethod section with the one the running controllers were built
+// from, so reloading the file has to reproduce that section byte for byte. A
+// default applied inconsistently — a nil recipient slice turned into an empty
+// one on the second load, say — would make every settings edit look like a
+// controller change and tear down every channel on each save.
+func TestUnrelatedUpdateLeavesControllerMethodAlone(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{
+    "controllerMethod": {
+        "qq(napcat)": { "enabled": false },
+        "email": { "enabled": false, "to": [] },
+        "webhook": { "enabled": false, "headers": {} }
+    }
+}`)
+
+	first, err := LoadGlobalConfig(global.ConfigPath.Global)
+	if err != nil {
+		t.Fatalf("LoadGlobalConfig: %v", err)
+	}
+	before := first.ControllerMethod
+
+	if err := UpdateSettings(SettingGlobal, map[string]interface{}{
+		"controllerMessage": map[string]interface{}{"BOT_STARTED": "hello"},
+	}); err != nil {
+		t.Fatalf("UpdateSettings: %v", err)
+	}
+
+	after := Current().ControllerMethod
+	if !reflect.DeepEqual(before, after) {
+		t.Errorf("an unrelated update changed the controllerMethod section:\nbefore: %+v\nafter:  %+v", before, after)
+	}
+}
+
+// TestReloadHookSeesEveryWriterPath pins the invariant that each writer of
+// config.json notifies, not just /api/settings/set: the webhook endpoint
+// helpers go through the same channel.
+func TestReloadHookSeesEveryWriterPath(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{
+    "webhook": { "endpoints": {} }
+}`)
+
+	var seen int
+	swapReloadHooks(t, func(*Config) { seen++ })
+
+	if err := AddWebhookEndpoint("example", map[string]interface{}{
+		"enabled":     true,
+		"token":       "secret",
+		"notifyPipes": []interface{}{"ntfy"},
+	}); err != nil {
+		t.Fatalf("AddWebhookEndpoint: %v", err)
+	}
+	if seen != 1 {
+		t.Errorf("hook ran %d times after adding an endpoint, want 1", seen)
+	}
+
+	if err := ModifyWebhookEndpoint("example", map[string]interface{}{
+		"enabled": false,
+	}); err != nil {
+		t.Fatalf("ModifyWebhookEndpoint: %v", err)
+	}
+	if seen != 2 {
+		t.Errorf("hook ran %d times after modifying an endpoint, want 2", seen)
+	}
+
+	if err := DeleteWebhookEndpoint("example"); err != nil {
+		t.Fatalf("DeleteWebhookEndpoint: %v", err)
+	}
+	if seen != 3 {
+		t.Errorf("hook ran %d times after deleting an endpoint, want 3", seen)
+	}
+
+	// A rejected write changes nothing, so it must not notify either.
+	if err := DeleteWebhookEndpoint("ghost"); err == nil {
+		t.Error("deleting an unknown endpoint should fail")
+	}
+	if seen != 3 {
+		t.Errorf("hook ran for a rejected write (%d notifications, want 3)", seen)
+	}
+}

config/settings.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"strings"
 	"sync"
 
 	"nukumizu-backend/global"
@@ -23,6 +24,89 @@ const (
 // accepted constants above.
 var ErrUnsupportedSettingsType = errors.New("unsupported settings type")
 
+// startupOnlySettings are the config.json keys that are read once before the
+// program starts serving and never again: the listener addresses, the paths the
+// databases are opened from, and the Komari dashboard its client is built
+// against. Editing one writes the file and replaces the in-memory
+// configuration, but the running program keeps the old value, so an update that
+// touches one is reported back to the caller instead of being silently
+// accepted.
+//
+// Keep this in step with main: these are exactly the settings main reads before
+// the HTTP server comes up. Everything else — controllerMethod, networkProxy,
+// the message templates, the debug switches — is picked up at runtime.
+var startupOnlySettings = []string{
+	"system.listenAddr",
+	"system.listenPort",
+	"webhook.enabled",
+	"webhook.listenAddr",
+	"webhook.listenPort",
+	"komari.dashboardURL",
+	"dataPath",
+	"dbPath",
+}
+
+// IsRestartRequiredKeys lists the settings in patch that only take effect at
+// startup, as dot-separated paths, in the order startupOnlySettings declares
+// them. Only config.json carries such settings; an update to one of the other
+// files always reports nothing.
+//
+// The write itself succeeds either way — this is advice for the user, not a
+// rejection. The result is never nil, so a caller can put it straight into a
+// JSON response and get [] rather than null.
+func IsRestartRequiredKeys(settingsType string, patch map[string]interface{}) []string {
+	keys := []string{}
+	if settingsType != SettingGlobal {
+		return keys
+	}
+
+	patched := patchPaths(patch)
+	for _, watched := range startupOnlySettings {
+		for _, path := range patched {
+			if isPathsOverlap(path, watched) {
+				keys = append(keys, watched)
+				break
+			}
+		}
+	}
+	return keys
+}
+
+// patchPaths expands a nested settings patch into the dot-separated paths of its
+// leaves. An object is descended into rather than reported, so a patch that only
+// names sections still resolves to the keys it changes, and a JSON null is a
+// leaf because it deletes the key it names.
+func patchPaths(patch map[string]interface{}) []string {
+	paths := []string{}
+	var walk func(prefix string, node map[string]interface{})
+	walk = func(prefix string, node map[string]interface{}) {
+		for key, value := range node {
+			path := key
+			if prefix != "" {
+				path = prefix + "." + key
+			}
+			if nested, ok := value.(map[string]interface{}); ok && nested != nil {
+				walk(path, nested)
+				continue
+			}
+			paths = append(paths, path)
+		}
+	}
+	walk("", patch)
+	return paths
+}
+
+// isPathsOverlap reports whether a patched path and a watched setting can affect
+// each other: they are the same key, the patch names something inside the
+// watched setting, or the patch names a section the watched setting lives in.
+// The last case matters because a patch may replace a whole section, which
+// changes every key under it.
+func isPathsOverlap(patched, watched string) bool {
+	return patched == watched ||
+		strings.HasPrefix(patched, watched+".") ||
+		strings.HasPrefix(watched, patched+".")
+}
+
 // settingsLock serializes read-modify-write access to the on-disk configuration
 // files so concurrent admin edits (UpdateSettings) and the node tracker's
 // background save (SaveBotNodeConfig) cannot lose each other's updates.
@@ -82,19 +166,45 @@ func GetSettings(settingsType string) ([]byte, error) {
 // written the matching in-memory singleton is reloaded so runtime code observes
 // the new values.
 func UpdateSettings(settingsType string, patch map[string]interface{}) error {
+	return runSettingsUpdate(func() (*Config, error) {
+		return updateSettingsLocked(settingsType, patch)
+	})
+}
+
+// runSettingsUpdate runs fn under settingsLock and then, once the lock is
+// released, runs the reload hooks with whatever configuration fn reports (nil
+// when the update did not touch config.json).
+//
+// The hooks deliberately run outside settingsLock. A hook rebuilds controllers,
+// which can wait on a network call, while settingsLock is also held by the node
+// tracker's background save (SaveBotNodeConfig); holding it across a hook would
+// stall node registration behind an unrelated settings edit.
+func runSettingsUpdate(fn func() (*Config, error)) error {
+	cfg, err := func() (*Config, error) {
 		settingsLock.Lock()
 		defer settingsLock.Unlock()
+		return fn()
+	}()
+	if err != nil {
+		return err
+	}
 
-	return updateSettingsLocked(settingsType, patch)
+	notifyReload(cfg)
+	return nil
 }
 
 // updateSettingsLocked is UpdateSettings without the locking, for callers that
 // need to inspect the loaded configuration and write in one critical section
 // (see the incoming webhook endpoint helpers). Callers must hold settingsLock.
-func updateSettingsLocked(settingsType string, patch map[string]interface{}) error {
+//
+// It returns the freshly loaded global configuration, or nil when the settings
+// type is one of the other files. The caller is responsible for handing that
+// value to notifyReload once settingsLock is released — which runSettingsUpdate
+// does for every writer.
+func updateSettingsLocked(settingsType string, patch map[string]interface{}) (*Config, error) {
 	path, err := settingsPath(settingsType)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	// Start from whatever is already on disk so nothing is dropped. A missing or
@@ -104,23 +214,23 @@ func updateSettingsLocked(settingsType string, patch map[string]interface{}) err
 	if err == nil {
 		if len(bytes.TrimSpace(data)) > 0 {
 			if err := json.Unmarshal(data, &current); err != nil {
-				return fmt.Errorf("failed to parse existing %s settings file %s: %w", settingsType, path, err)
+				return nil, fmt.Errorf("failed to parse existing %s settings file %s: %w", settingsType, path, err)
 			}
 		}
 	} else if !os.IsNotExist(err) {
-		return fmt.Errorf("failed to read existing %s settings file %s: %w", settingsType, path, err)
+		return nil, fmt.Errorf("failed to read existing %s settings file %s: %w", settingsType, path, err)
 	}
 
 	deepMergeSettings(current, patch)
 
 	data, err = json.MarshalIndent(current, "", "    ")
 	if err != nil {
-		return fmt.Errorf("failed to marshal %s settings: %w", settingsType, err)
+		return nil, fmt.Errorf("failed to marshal %s settings: %w", settingsType, err)
 	}
 	data = append(data, '\n')
 
 	if err := os.WriteFile(path, data, 0o644); err != nil {
-		return fmt.Errorf("failed to write %s settings file %s: %w", settingsType, path, err)
+		return nil, fmt.Errorf("failed to write %s settings file %s: %w", settingsType, path, err)
 	}
 
 	return reloadSettings(settingsType, path)
@@ -151,18 +261,19 @@ func deepMergeSettings(dst, src map[string]interface{}) {
 }
 
 // reloadSettings refreshes the in-memory singleton for the given settings type
-// so the running program observes the values just persisted to disk.
+// so the running program observes the values just persisted to disk. Only
-func reloadSettings(settingsType, path string) error {
+// config.json has a hook-visible reload, so for SettingGlobal it returns the
+// configuration now in effect and for the other types it returns nil.
+func reloadSettings(settingsType, path string) (*Config, error) {
 	switch settingsType {
 	case SettingGlobal:
-		_, err := LoadGlobalConfig(path)
+		return LoadGlobalConfig(path)
-		return err
 	case SettingBotUserConfig:
 		_, err := LoadBotUserConfig(path)
-		return err
+		return nil, err
 	case SettingBotNodeConfig:
-		return LoadBotNodeConfig(path)
+		return nil, LoadBotNodeConfig(path)
 	default:
-		return ErrUnsupportedSettingsType
+		return nil, ErrUnsupportedSettingsType
 	}
 }

config/settings_test.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"os"
 	"path/filepath"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -27,13 +28,13 @@ func TestUpdateSettingsDeepMerge(t *testing.T) {
 	writeTempConfig(t, &global.ConfigPath.BotUserConfig, `{
     "qq(napcat)": {
         "admins": {
-            "3526453517": {
+            "100000001": {
                 "event_status_notify": true,
                 "event_bot_started": true
             }
         },
         "trustedGroups": {
-            "740724778": {
+            "200000002": {
                 "event_status_notify": true,
                 "event_bot_started": false
             }
@@ -44,7 +45,7 @@ func TestUpdateSettingsDeepMerge(t *testing.T) {
 	patch := map[string]interface{}{
 		"qq(napcat)": map[string]interface{}{
 			"admins": map[string]interface{}{
-				"3526453517": map[string]interface{}{
+				"100000001": map[string]interface{}{
 					"event_status_notify": false, // toggle an existing nested flag
 					"event_reply":         true,  // add a key that is not in the file
 				},
@@ -70,7 +71,7 @@ func TestUpdateSettingsDeepMerge(t *testing.T) {
 		`"event_status_notify": false`,
 		`"event_reply": true`,
 		`"event_bot_started": true`,
-		`"event_status_notify": true`, // sibling under trustedGroups 740724778 kept
+		`"event_status_notify": true`, // sibling under trustedGroups 200000002 kept
 		`"12345"`,
 	} {
 		if !strings.Contains(got, want) {
@@ -79,16 +80,17 @@ func TestUpdateSettingsDeepMerge(t *testing.T) {
 	}
 
 	// The in-memory singleton must reflect the merged file too.
-	if C_botUserConfig == nil {
+	users := BotUsers()
-		t.Fatal("C_botUserConfig not reloaded")
+	if users == nil {
+		t.Fatal("bot user config not reloaded")
 	}
-	if C_botUserConfig.QQ.Admins["3526453517"].EventStatusNotify {
+	if users.QQ.Admins["100000001"].EventStatusNotify {
 		t.Error("expected reloaded admin event_status_notify = false")
 	}
-	if !C_botUserConfig.QQ.Admins["3526453517"].EventReply {
+	if !users.QQ.Admins["100000001"].EventReply {
 		t.Error("expected reloaded admin event_reply = true")
 	}
-	if !C_botUserConfig.QQ.TrustedGroups["12345"].EventBotStarted {
+	if !users.QQ.TrustedGroups["12345"].EventBotStarted {
 		t.Error("expected new trusted group event_bot_started = true")
 	}
 }
@@ -147,6 +149,162 @@ func TestUpdateSettingsReplacesArraysAndKeepsNumbers(t *testing.T) {
 	}
 }
 
+func TestRestartRequiredKeys(t *testing.T) {
+	cases := []struct {
+		name         string
+		settingsType string
+		patch        map[string]interface{}
+		want         []string
+	}{
+		{
+			name:         "a runtime switch needs no restart",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"system": map[string]interface{}{"debugMode": true}},
+			want:         []string{},
+		},
+		{
+			name:         "the listen port does",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"system": map[string]interface{}{"listenPort": "9090"}},
+			want:         []string{"system.listenPort"},
+		},
+		{
+			name:         "only the startup key of a mixed patch is reported",
+			settingsType: SettingGlobal,
+			patch: map[string]interface{}{
+				"system": map[string]interface{}{"listenPort": "9090", "debugMode": true},
+			},
+			want: []string{"system.listenPort"},
+		},
+		{
+			name:         "a top-level path is reported",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"dataPath": "/srv/data"},
+			want:         []string{"dataPath"},
+		},
+		{
+			name:         "results follow the declared order, not the patch order",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"dbPath": "/srv/db", "dataPath": "/srv/data"},
+			want:         []string{"dataPath", "dbPath"},
+		},
+		{
+			name:         "deleting a startup key with null is reported",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"system": map[string]interface{}{"listenPort": nil}},
+			want:         []string{"system.listenPort"},
+		},
+		{
+			name:         "replacing a whole section reports the startup keys inside it",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"webhook": map[string]interface{}{"listenAddr": "127.0.0.1"}},
+			want:         []string{"webhook.listenAddr"},
+		},
+		{
+			// Deleting the section resets the URL to its built-in default.
+			name:         "deleting a section the startup key lives in reports it",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"komari": nil},
+			want:         []string{"komari.dashboardURL"},
+		},
+		{
+			name:         "deleting a section reports every startup key inside it",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"webhook": nil},
+			want:         []string{"webhook.enabled", "webhook.listenAddr", "webhook.listenPort"},
+		},
+		{
+			// An empty object merges nothing, so it changes no key and needs no
+			// restart — surprising enough to pin.
+			name:         "an empty object changes nothing",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{"komari": map[string]interface{}{}},
+			want:         []string{},
+		},
+		{
+			// webhook.endpoints must not be mistaken for webhook.enabled.
+			name:         "a sibling subtree is not mistaken for the startup key",
+			settingsType: SettingGlobal,
+			patch: map[string]interface{}{
+				"webhook": map[string]interface{}{
+					"endpoints": map[string]interface{}{"example": map[string]interface{}{"enabled": true}},
+				},
+			},
+			want: []string{},
+		},
+		{
+			// The Komari credentials are re-read on the next login, so only the
+			// dashboard URL is startup-only.
+			name:         "komari credentials are not startup-only",
+			settingsType: SettingGlobal,
+			patch: map[string]interface{}{
+				"komari": map[string]interface{}{
+					"account": map[string]interface{}{"username": "admin", "password": "x"},
+				},
+			},
+			want: []string{},
+		},
+		{
+			name:         "controller settings are not startup-only",
+			settingsType: SettingGlobal,
+			patch: map[string]interface{}{
+				"controllerMethod": map[string]interface{}{
+					"telegram": map[string]interface{}{"enabled": true, "botToken": "t"},
+				},
+			},
+			want: []string{},
+		},
+		{
+			name:         "an empty patch reports nothing",
+			settingsType: SettingGlobal,
+			patch:        map[string]interface{}{},
+			want:         []string{},
+		},
+		{
+			// Only config.json has settings that are read once at startup.
+			name:         "the other settings files never need a restart",
+			settingsType: SettingBotUserConfig,
+			patch:        map[string]interface{}{"dataPath": "/srv/data"},
+			want:         []string{},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got := IsRestartRequiredKeys(tc.settingsType, tc.patch)
+			if !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("RestartRequiredKeys() = %v, want %v", got, tc.want)
+			}
+			if got == nil {
+				t.Error("the result must never be nil, so it serializes as [] rather than null")
+			}
+		})
+	}
+}
+
+// TestRestartRequiredKeysIsAdvisory pins that reporting a startup-only key does
+// not stop the write: the caller is told, the file is still updated.
+func TestRestartRequiredKeysIsAdvisory(t *testing.T) {
+	writeTempConfig(t, &global.ConfigPath.Global, `{"system":{"listenPort":"8080"}}`)
+
+	keys := IsRestartRequiredKeys(SettingGlobal, map[string]interface{}{
+		"system": map[string]interface{}{"listenPort": "9090"},
+	})
+	if len(keys) != 1 {
+		t.Fatalf("expected the listen port to be reported, got %v", keys)
+	}
+
+	if err := UpdateSettings(SettingGlobal, map[string]interface{}{
+		"system": map[string]interface{}{"listenPort": "9090"},
+	}); err != nil {
+		t.Fatalf("UpdateSettings: %v", err)
+	}
+
+	if got := Current().System.ListenPort; got != "9090" {
+		t.Errorf("the update was not applied: listenPort = %q", got)
+	}
+}
+
 func TestSettingsTypeValidation(t *testing.T) {
 	for _, valid := range []string{SettingGlobal, SettingBotUserConfig, SettingBotNodeConfig} {
 		if !IsValidSettingsType(valid) {
@@ -181,8 +339,8 @@ func TestUpdateSettingsRemovesKeysWithNull(t *testing.T) {
 	writeTempConfig(t, &global.ConfigPath.BotUserConfig, `{
     "qq(napcat)": {
         "admins": {
-            "3526453517": { "event_status_notify": true },
+            "100000001": { "event_status_notify": true },
-            "740724778": { "event_status_notify": false }
+            "200000002": { "event_status_notify": false }
         },
         "trustedGroups": {
             "999": { "event_bot_started": true }
@@ -197,7 +355,7 @@ func TestUpdateSettingsRemovesKeysWithNull(t *testing.T) {
 	patch := map[string]interface{}{
 		"qq(napcat)": map[string]interface{}{
 			"admins": map[string]interface{}{
-				"3526453517": nil,
+				"100000001": nil,
 			},
 		},
 	}
@@ -210,10 +368,10 @@ func TestUpdateSettingsRemovesKeysWithNull(t *testing.T) {
 		t.Fatalf("GetSettings: %v", err)
 	}
 	got := string(data)
-	if strings.Contains(got, "3526453517") {
+	if strings.Contains(got, "100000001") {
 		t.Errorf("deleted member still present:\n%s", got)
 	}
-	for _, want := range []string{"740724778", `"trustedGroups"`, `"telegram"`} {
+	for _, want := range []string{"200000002", `"trustedGroups"`, `"telegram"`} {
 		if !strings.Contains(got, want) {
 			t.Errorf("unrelated content missing %q:\n%s", want, got)
 		}

config/variables.go

@@ -1,6 +1,9 @@
 package config
 
-import "sort"
+import (
+	"sort"
+	"sync/atomic"
+)
 
 // SystemConfig holds system-level configuration.
 type SystemConfig struct {
@@ -12,12 +15,13 @@ type SystemConfig struct {
 
 // DebugConfig holds debug-level configuration.
 type DebugConfig struct {
-	ShowNapcatMsg       bool `json:"showNapcatMsg"`
+	ShowOneBotMsg     	     bool `json:"showOneBotMsg"`
-	ShowNapcatAction    bool `json:"showNapcatAction"`
+	ShowOneBotAction  	     bool `json:"showOneBotAction"`
 	ShowTelegramMsg  	     bool `json:"showTelegramMsg"`
 	ShowTriggerCmdEcho  	 bool `json:"showTriggerCmdEcho"`
 	ShowKomariTaskEcho 		 bool `json:"showKomariTaskEcho"`
-	NapcatIgnoreSelfMsg bool `json:"napcatIgnoreSelfMsg"`
+	OneBotIgnoreSelfMsg		 bool `json:"oneBotIgnoreSelfMsg"`
+	ShowFlapTolerantEcho 	 bool `json:"showFlapTolerantEcho"`
 }
 
 // KomariAccount holds Komari login credentials.
@@ -32,14 +36,14 @@ type KomariConfig struct {
 	Account      KomariAccount `json:"account"`
 }
 
-// QQConfig holds QQ (Napcat) Bot controller configuration.
+// QQConfig holds QQ (OneBot) Bot controller configuration.
-type QQConfig struct {
+type OneBotConfig struct {
 	Markdown     	bool   `json:"markdown"`
 	Enabled         bool   `json:"enabled"`
 	NetworkUseProxy bool   `json:"networkUseProxy"`
-	NapcatAddr      string `json:"napcatAddr"`
+	OneBotAddr      string `json:"oneBotAddr"`
-	NapcatPort      string `json:"napcatPort"`
+	OneBotPort      string `json:"oneBotPort"`
-	NapcatToken     string `json:"napcatToken"`
+	OneBotToken     string `json:"oneBotToken"`
 	BotQQID         int64  `json:"botQQID"`
 	ListenMethod    string `json:"listenMethod"`
 }
@@ -93,7 +97,7 @@ type WebhookConfig struct {
 
 // ControllerMethodConfig holds all controller method configurations.
 type ControllerMethodConfig struct {
-	QQ       QQConfig       `json:"qq(napcat)"`
+	QQ_OneBot   OneBotConfig   `json:"qq_onebot"`
 	Telegram 	TelegramConfig `json:"telegram"`
 	Email    	EmailConfig    `json:"email"`
 	Ntfy     	NtfyConfig     `json:"ntfy"`
@@ -116,7 +120,7 @@ type WebhookEndpointConfig struct {
 	Token string `json:"token"`
 
 	// NotifyPipes lists the notification channels the alert is delivered to, by
-	// controller name (e.g. "qq(napcat)", "telegram", "email", "ntfy",
+	// controller name (e.g. "qq(onebot)", "telegram", "email", "ntfy",
 	// "webhook").
 	NotifyPipes []string `json:"notifyPipes"`
 }
@@ -136,10 +140,11 @@ type WebhookReceiverConfig struct {
 // GetWebhookEndpoint returns the incoming webhook endpoint registered under the
 // given name, and whether such an endpoint exists.
 func GetWebhookEndpoint(name string) (WebhookEndpointConfig, bool) {
-	if C_globalConfig == nil {
+	cfg := Current()
+	if cfg == nil {
 		return WebhookEndpointConfig{}, false
 	}
-	endpoint, ok := C_globalConfig.Webhook.Endpoints[name]
+	endpoint, ok := cfg.Webhook.Endpoints[name]
 	return endpoint, ok
 }
 
@@ -165,7 +170,19 @@ type Config struct {
 	DBPath            string                  `json:"dbPath"`
 }
 
-var C_globalConfig *Config
+// globalConfig holds the configuration currently in effect. It is replaced as a
+// whole by LoadGlobalConfig — and therefore by every settings update — and never
+// mutated in place, so a reader that loads the pointer always observes a fully
+// initialized Config. Read it through Current rather than caching the result: a
+// cached pointer stops tracking reloads.
+var globalConfig atomic.Pointer[Config]
+
+// Current returns the configuration currently in effect, or nil before the
+// first successful LoadGlobalConfig. It is safe to call from any goroutine, and
+// must be called on every use rather than stored, so the caller sees reloads.
+func Current() *Config {
+	return globalConfig.Load()
+}
 
 // BotUserOptions holds per-member options stored in bot_user_config.json.
 type BotUserOptions struct {
@@ -200,7 +217,7 @@ func (m BotUserMembers) IDs() []string {
 	return ids
 }
 
-// BotUser_QQConfig holds the admins and trusted groups for the QQ (Napcat) bot.
+// BotUser_QQConfig holds the admins and trusted groups for the QQ (OneBot) bot.
 type BotUser_QQConfig struct {
 	Admins        BotUserMembers `json:"admins"`
 	TrustedGroups BotUserMembers `json:"trustedGroups"`
@@ -216,11 +233,20 @@ type BotUser_TelegramConfig struct {
 // and trusted groups (chat targets) for each bot channel separately from the
 // main config.json.
 type BotUserConfig struct {
-	QQ       BotUser_QQConfig       `json:"qq(napcat)"`
+	QQ       BotUser_QQConfig       `json:"qq_onebot"`
 	Telegram BotUser_TelegramConfig `json:"telegram"`
 }
 
-var C_botUserConfig *BotUserConfig
+// botUserConfig mirrors bot_user_config.json the same way globalConfig mirrors
+// config.json: replaced wholesale on reload and read through BotUsers.
+var botUserConfig atomic.Pointer[BotUserConfig]
+
+// BotUsers returns the bot user configuration currently in effect, or nil
+// before the first successful LoadBotUserConfig. Like Current it must be called
+// on every use rather than stored.
+func BotUsers() *BotUserConfig {
+	return botUserConfig.Load()
+}
 
 // BotNodeOptions holds per-node options stored in bot_node_config.json. The
 // file is auto-populated by the node tracker for every node Komari reports;
@@ -232,12 +258,35 @@ type BotNodeOptions struct {
 	// bool) lets an absent field be told apart from an explicit false, and
 	// omitempty keeps untouched nodes stored as {}.
 	EnableStatusNotify *bool `json:"enableStatusNotify,omitempty"`
+
+	// FlapTolerant is the number of seconds a node's Offline notification is
+	// held in the hope the node returns. A node that comes back online within
+	// this window produces no notification at all; one still offline when the
+	// window elapses reports Offline as usual. Zero (or an absent field)
+	// disables inhibition, which keeps the notify-immediately behavior. It is
+	// a float64 rather than an int so a hand-written fractional value such as
+	// 2.5 parses instead of failing the whole config load at startup, and it
+	// is not a pointer because 0 already means "off", unlike
+	// EnableStatusNotify whose default is true.
+	FlapTolerant float64 `json:"flap_tolerant,omitempty"`
 }
 
 // BotNodeMembers maps a node UUID (as reported by Komari) to its per-node
 // options.
 type BotNodeMembers map[string]BotNodeOptions
 
-// C_botNodeConfig is the global singleton mirroring bot_node_config.json,
+// NodeConfig mirrors bot_node_config.json, populated by LoadNodeConfig.
-// populated by LoadBotNodeConfig.
+// The map is rebuilt rather than mutated on every load, so the pointer can be
-var C_botNodeConfig BotNodeMembers
+// swapped atomically; read it through BotNodes.
+var botNodeConfig atomic.Pointer[BotNodeMembers]
+
+// BotNodes returns the per-node options currently in effect, or nil before the
+// first LoadBotNodeConfig. Like Current it must be called on every use rather
+// than stored.
+func BotNodes() BotNodeMembers {
+	nodes := botNodeConfig.Load()
+	if nodes == nil {
+		return nil
+	}
+	return *nodes
+}

config/webhook.go

@@ -37,10 +37,11 @@ var webhookEndpointFields = map[string]func(interface{}) bool{
 // configuration.
 func WebhookEndpoints() map[string]WebhookEndpointConfig {
 	endpoints := map[string]WebhookEndpointConfig{}
-	if C_globalConfig == nil {
+	cfg := Current()
+	if cfg == nil {
 		return endpoints
 	}
-	for name, endpoint := range C_globalConfig.Webhook.Endpoints {
+	for name, endpoint := range cfg.Webhook.Endpoints {
 		endpoints[name] = endpoint
 	}
 	return endpoints
@@ -59,13 +60,12 @@ func AddWebhookEndpoint(name string, fields map[string]interface{}) error {
 		return err
 	}
 
-	settingsLock.Lock()
+	return runSettingsUpdate(func() (*Config, error) {
-	defer settingsLock.Unlock()
-
 		if _, exists := webhookEndpoint(name); exists {
-		return fmt.Errorf("%w: %s", ErrWebhookEndpointExists, name)
+			return nil, fmt.Errorf("%w: %s", ErrWebhookEndpointExists, name)
 		}
 		return updateSettingsLocked(SettingGlobal, webhookEndpointsPatch(name, patch))
+	})
 }
 
 // ModifyWebhookEndpoint updates an existing incoming webhook endpoint. Only the
@@ -83,38 +83,36 @@ func ModifyWebhookEndpoint(name string, fields map[string]interface{}) error {
 		return fmt.Errorf("%w: no fields to update", ErrWebhookEndpointInvalid)
 	}
 
-	settingsLock.Lock()
+	return runSettingsUpdate(func() (*Config, error) {
-	defer settingsLock.Unlock()
-
 		if _, exists := webhookEndpoint(name); !exists {
-		return fmt.Errorf("%w: %s", ErrWebhookEndpointNotFound, name)
+			return nil, fmt.Errorf("%w: %s", ErrWebhookEndpointNotFound, name)
 		}
 		return updateSettingsLocked(SettingGlobal, webhookEndpointsPatch(name, patch))
+	})
 }
 
 // DeleteWebhookEndpoint removes the incoming webhook endpoint registered under
 // name. The endpoint stops accepting requests as soon as the configuration is
 // reloaded.
 func DeleteWebhookEndpoint(name string) error {
-	settingsLock.Lock()
+	return runSettingsUpdate(func() (*Config, error) {
-	defer settingsLock.Unlock()
-
 		if _, exists := webhookEndpoint(name); !exists {
-		return fmt.Errorf("%w: %s", ErrWebhookEndpointNotFound, name)
+			return nil, fmt.Errorf("%w: %s", ErrWebhookEndpointNotFound, name)
 		}
-
 		return updateSettingsLocked(SettingGlobal, webhookEndpointDeletePatch(name))
+	})
 }
 
 // webhookEndpoint returns the named endpoint held by the loaded configuration.
-// No lock is needed to read it: a reload replaces the whole configuration
+// No extra lock is needed to read it: a reload replaces the whole configuration
-// rather than mutating it in place, and the value is read from whichever
+// rather than mutating it in place, and Current publishes the replacement
-// version is current.
+// atomically, so the value read is always from one complete version.
 func webhookEndpoint(name string) (WebhookEndpointConfig, bool) {
-	if C_globalConfig == nil {
+	cfg := Current()
+	if cfg == nil {
 		return WebhookEndpointConfig{}, false
 	}
-	endpoint, exists := C_globalConfig.Webhook.Endpoints[name]
+	endpoint, exists := cfg.Webhook.Endpoints[name]
 	return endpoint, exists
 }
 

frontend/README.md

@@ -5,7 +5,7 @@ Web console for the Nukumizu backend — a remote-server monitor and alert bot.
 ## Features
 
 - **Sign in / first-run admin** — login, or create the very first admin while the database is still empty (the backend rejects further registrations once any user exists).
-- **Nodes (overview)** — live server cards from the backend status/info APIs: online state, CPU / RAM / disk load, plus the per-node *status notify* switch persisted to `bot_node_config.json`. Searchable, auto-refreshes.
+- **Nodes (overview)** — live server cards from the backend status/info APIs: online state, CPU / RAM / disk load. The pencil on a card opens a per-node options dialog holding the *status notify* switch and the *flap inhibition* window, persisted to `bot_node_config.json`. Searchable, auto-refreshes.
 - **Bot trust** — manage QQ (NapCat) and Telegram admins & trusted groups in `bot_user_config.json`: add / remove members and toggle each member's `status notify`, `startup notify`, and `command replies`.
 - **Settings** — structured forms for the global `config.json` (system, debug, Komari dashboard, controller methods, message templates, storage paths). Each card saves only its own section.
 - **System logs** — live WebSocket log stream (`/api/system/getLogs`) with severity filter chips, search, pause/resume and export.

frontend/package-lock.json

@@ -1473,7 +1473,6 @@
       "integrity": "sha512-qcJu88Q2IWqJsDD529JKMdwGm/dvInW4HvQnRwiH9JtihJvzGOscDtHE3x1pBKeUOTysQ8kVmLnJ2kJu7yhcGA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -1596,7 +1595,6 @@
       "integrity": "sha512-NTKlcQjlAK7MlQoyb6LgaqHc8sso/pVyUJYWMws3jg21uTJw/LddqIFPcPqP6PzpgbIcZyKI85sFE4HBrQDA8A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.4.4",
@@ -1671,7 +1669,6 @@
       "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.42.tgz",
       "integrity": "sha512-4RyHQTbQvOPs3MfvUO1Sg0YRrKNnA0mAVtvpd12Tg1fKDN7OHBUl1IqSn8zGJjK9nI3NkNp8cgTpVrSZC5TTcA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/compiler-dom": "3.5.42",
         "@vue/compiler-sfc": "3.5.42",

frontend/src/api/index.js

@@ -13,6 +13,10 @@ export const serverApi = {
 
 // /api/settings/get?type=… / /api/settings/set?type=…
 // get → { success, message, data: { config } }.
+// set → { success, message, data: { type, restartRequired } }, where
+//       restartRequired lists the keys the update changed that are only read at
+//       startup, so the caller can say which edits are not live yet. It is
+//       always an array, empty when the whole update took effect.
 // `type` is one of global | bot_user_config | bot_node_config.
 // For set, pass a partial object; a JSON null value removes that key.
 export const settingsApi = {

frontend/src/components/ConfigSection.vue

@@ -133,8 +133,15 @@ async function save() {
     const patch = wrapRoot(props.section, nest(obj));
     saving.value = true;
     try {
-        await settingsApi.set('global', patch);
+        const res = await settingsApi.set('global', patch);
+        // The backend reports the keys it wrote that are only read at startup.
+        // A plain "saved" would suggest those are live too.
+        const pending = (res && res.data && res.data.restartRequired) || [];
+        if (pending.length) {
+            toast.warn(`${props.section.title} saved — restart to apply: ${pending.join(', ')}`, 7000);
+        } else {
             toast.success(`${props.section.title} saved`);
+        }
         emit('saved');
     } catch (e) {
         toast.error('Failed to save: ' + e.message);

frontend/src/views/Overview.vue

@@ -4,6 +4,7 @@ import { serverApi, settingsApi } from '../api/index.js';
 import { toast } from '../utils/toast.js';
 import { formatBytes, shortUUID } from '../utils/fmt.js';
 import Toggle from '../components/Toggle.vue';
+import Modal from '../components/Modal.vue';
 
 function percent(m) {
     return m && m.total ? Math.min(100, Math.max(0, Math.round((m.used / m.total) * 100))) : 0;
@@ -13,9 +14,20 @@ const query = ref('');
 const loading = ref(true);
 const failed = ref(false);
 const entries = ref([]);
-const saving = reactive(new Set());
 let timer = null;
 
+// The per-node options dialog. Its form is a copy of the node's settings taken
+// when the dialog opens, so the 15s card refresh behind it cannot disturb an
+// open editor, and closing without saving leaves the node untouched.
+const editing = reactive({
+    open: false,
+    uuid: '',
+    name: '',
+    notify: true,
+    flap: '',
+    saving: false
+});
+
 const filtered = computed(() => {
     const q = query.value.trim().toLowerCase();
     if (!q) return entries.value;
@@ -57,7 +69,8 @@ async function load() {
                 online: !!s.online,
                 report: s.report || null,
                 info: infoEntry.info || null,
-                notify: conf.enableStatusNotify !== false
+                notify: conf.enableStatusNotify !== false,
+                flapTolerant: Number(conf.flap_tolerant) > 0 ? Number(conf.flap_tolerant) : 0
             });
         }
         list.sort((a, b) => (a.online === b.online ? a.name.localeCompare(b.name) : b.online ? 1 : -1));
@@ -71,21 +84,42 @@ async function load() {
     }
 }
 
-async function toggleNotify(entry) {
+function openOptions(entry) {
-    const next = !entry.notify;
+    editing.uuid = entry.uuid;
-    const prev = entry.notify;
+    editing.name = entry.name;
-    entry.notify = next;
+    editing.notify = entry.notify;
-    saving.add(entry.uuid);
+    editing.flap = entry.flapTolerant ? String(entry.flapTolerant) : '';
+    editing.open = true;
+}
+
+// saveOptions writes both options in one patch. A flap window that is not a
+// positive number disables inhibition, which is sent as a JSON null so the key
+// is removed rather than stored as an explicit 0 — the file then keeps matching
+// its documented "absent means off" default.
+async function saveOptions() {
+    const typed = Number(editing.flap);
+    const seconds = Number.isFinite(typed) && typed > 0 ? typed : 0;
+    const uuid = editing.uuid;
+
+    editing.saving = true;
     try {
         const patch = {};
-        patch[entry.uuid] = { enableStatusNotify: next };
+        patch[uuid] = {
+            enableStatusNotify: editing.notify,
+            flap_tolerant: seconds > 0 ? seconds : null
+        };
         await settingsApi.set('bot_node_config', patch);
-        toast.success(`${entry.name}: status notify ${next ? 'on' : 'off'}`);
+        const entry = entries.value.find((e) => e.uuid === uuid);
+        if (entry) {
+            entry.notify = editing.notify;
+            entry.flapTolerant = seconds;
+        }
+        toast.success(`${editing.name}: options saved`);
+        editing.open = false;
     } catch (e) {
-        entry.notify = prev;
         toast.error('Save failed: ' + e.message);
     } finally {
-        saving.delete(entry.uuid);
+        editing.saving = false;
     }
 }
 
@@ -111,7 +145,6 @@ onBeforeUnmount(() => {
             <div>
                 <p class="eyebrow">Overview</p>
                 <h1>Nodes</h1>
-                <p class="lead">Monitored servers with live load, online state, and the per-node status-notify switch.</p>
             </div>
             <div class="head-actions">
                 <button class="btn btn-ghost" title="Refresh" :disabled="loading" @click="load">
@@ -207,17 +240,60 @@ onBeforeUnmount(() => {
                         <span>·</span>
                         <span class="mono">{{ e.info.ipv4 || (e.info.ipv6 ? 'IPv6' : '—') }}</span>
                     </div>
-                    <div class="notify">
+                    <div class="opts">
-                        <Toggle
+                        <span v-if="!e.notify" class="chip" title="Status-change notifications are off for this node">
-                            :model-value="e.notify"
+                            <i class="fas fa-bell-slash" /> Notify off
-                            label="Status notify"
+                        </span>
-                            :disabled="saving.has(e.uuid)"
+                        <span v-if="e.flapTolerant" class="chip" title="Flap inhibition window">
-                            @update:model-value="toggleNotify(e)"
+                            <i class="fas fa-shield-halved" /> Flap {{ e.flapTolerant }}s
-                        />
+                        </span>
+                        <button class="icon-btn" title="Node options" @click="openOptions(e)">
+                            <i class="fas fa-pen" />
+                        </button>
                     </div>
                 </footer>
             </article>
         </div>
+
+        <Modal :open="editing.open" title="Node options" @close="editing.open = false">
+            <div class="node-head">
+                <p class="node-name">{{ editing.name }}</p>
+                <p class="node-uuid mono">{{ editing.uuid }}</p>
+            </div>
+
+            <div class="field">
+                <label>Status notify</label>
+                <Toggle v-model="editing.notify" label="Report online / offline changes" />
+                <p class="help">With this off, the node's status changes are not delivered to any pipes.</p>
+            </div>
+
+            <div class="field">
+                <label>Flap inhibition</label>
+                <div class="flap-row">
+                    <input
+                        v-model="editing.flap"
+                        class="input flap-input"
+                        type="number"
+                        min="0"
+                        max="86400"
+                        step="1"
+                        inputmode="numeric"
+                        placeholder="0"
+                        @keydown.enter="saveOptions"
+                    />
+                    <span class="flap-unit">seconds</span>
+                </div>
+                <p class="help">How long the node may drop offline and come back without a notification being sent. An outage lasting longer than this is still reported. Leave empty or 0 to report every change right away.</p>
+            </div>
+
+            <template #foot>
+                <button class="btn btn-ghost" @click="editing.open = false">Cancel</button>
+                <button class="btn btn-primary" :disabled="editing.saving" @click="saveOptions">
+                    <span v-if="editing.saving" class="spinner" style="width:12px;height:12px" />
+                    <i v-else class="fas fa-check" /> Save
+                </button>
+            </template>
+        </Modal>
     </section>
 </template>
 
@@ -298,7 +374,67 @@ onBeforeUnmount(() => {
     flex-wrap: wrap;
 }
 
-.notify { display: flex; align-items: center; }
+.opts {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    flex-shrink: 0;
+    /* Stay right-aligned even when the spec block is absent. */
+    margin-left: auto;
+}
+
+.opts .chip { white-space: nowrap; }
+
+/* --- Node options dialog ------------------------------------------------ */
+
+.node-head {
+    padding-bottom: 14px;
+    margin-bottom: 16px;
+    border-bottom: 1px solid var(--line);
+}
+
+.node-name {
+    font-size: 15px;
+    font-weight: 600;
+    color: var(--text);
+}
+
+.node-uuid {
+    font-size: 11.5px;
+    color: var(--text-3);
+    margin-top: 3px;
+    overflow-wrap: anywhere;
+}
+
+/* The modal body has no grid to space stacked fields. */
+.field + .field { margin-top: 20px; }
+
+.flap-row {
+    display: flex;
+    align-items: center;
+    gap: 9px;
+}
+
+.flap-input {
+    width: 110px;
+    text-align: center;
+    font-variant-numeric: tabular-nums;
+    /* Match the plain hand-rolled field look: the rest of the console renders
+       numbers as ordinary inputs, so the spinner controls would stand out. */
+    -moz-appearance: textfield;
+    appearance: textfield;
+}
+
+.flap-input::-webkit-outer-spin-button,
+.flap-input::-webkit-inner-spin-button {
+    -webkit-appearance: none;
+    margin: 0;
+}
+
+.flap-unit {
+    font-size: 12.5px;
+    color: var(--text-3);
+}
 
 .refresh-hint {
     font-size: 12px;

frontend/src/views/Settings.vue

@@ -11,7 +11,7 @@ const sections = [
     {
         id: 'system',
         title: 'System',
-        hint: 'HTTP listener and global runtime switches.',
+        hint: 'HTTP listener and global runtime switches. A changed listen address or port applies on restart.',
         root: ['system'],
         fields: [
             { key: 'debugMode', type: 'bool', label: 'Debug mode', help: 'Skipped X-Timestamp checks and verbose debug logging.' },
@@ -23,21 +23,22 @@ const sections = [
     {
         id: 'debug',
         title: 'Debug logging',
-        hint: 'Per-module verbosity for the bot pipes.',
+        hint: '',
         root: ['debug'],
         fields: [
-            { key: 'showNapcatMsg', type: 'bool', label: 'NapCat messages' },
+            { key: 'showOneBotMsg', type: 'bool', label: 'OneBot messages' },
-            { key: 'showNapcatAction', type: 'bool', label: 'NapCat actions' },
+            { key: 'showOneBotAction', type: 'bool', label: 'OneBot actions' },
             { key: 'showTelegramMsg', type: 'bool', label: 'Telegram messages' },
             { key: 'showTriggerCmdEcho', type: 'bool', label: 'Trigger command echo' },
             { key: 'showKomariTaskEcho', type: 'bool', label: 'Komari task echo' },
-            { key: 'napcatIgnoreSelfMsg', type: 'bool', label: 'Ignore NapCat self messages' }
+            { key: 'showFlapTolerantEcho', type: 'bool', label: 'Flap inhibition echo' },
+            { key: 'onebotIgnoreSelfMsg', type: 'bool', label: 'Ignore OneBot self messages' }
         ]
     },
     {
         id: 'komari',
         title: 'Komari dashboard',
-        hint: 'Connection the monitor reads node data from. Takes effect on restart.',
+        hint: 'Connection the monitor reads node data from. The URL applies on restart; the account is re-read on the next login.',
         root: ['komari'],
         fields: [
             { key: 'dashboardURL', type: 'text', label: 'Dashboard URL' },
@@ -60,16 +61,16 @@ const sections = [
         ]
     },
     {
-        id: 'qq',
+        id: 'qq_onebot',
-        title: 'QQ controller (NapCat)',
+        title: 'QQ controller (OneBot)',
-        root: ['controllerMethod', 'qq(napcat)'],
+        root: ['controllerMethod', 'qq_onebot'],
         fields: [
             { key: 'enabled', type: 'bool', label: 'Enabled' },
             { key: 'markdown', type: 'bool', label: 'Markdown', help: 'Send the formatted variant of the templates (code blocks, inline code).' },
             { key: 'networkUseProxy', type: 'bool', label: 'Use network proxy' },
-            { key: 'napcatAddr', type: 'text', label: 'NapCat address' },
+            { key: 'oneBotAddr', type: 'text', label: 'OneBot address' },
-            { key: 'napcatPort', type: 'text', label: 'NapCat port' },
+            { key: 'oneBotPort', type: 'text', label: 'OneBot port' },
-            { key: 'napcatToken', type: 'password', label: 'NapCat token' },
+            { key: 'oneBotToken', type: 'password', label: 'OneBot token' },
             { key: 'botQQID', type: 'number', label: 'Bot QQ ID' },
             { key: 'listenMethod', type: 'select', label: 'Listen method', options: ['global', 'at'] }
         ]
@@ -80,7 +81,7 @@ const sections = [
         root: ['controllerMethod', 'telegram'],
         fields: [
             { key: 'enabled', type: 'bool', label: 'Enabled' },
-            { key: 'markdown', type: 'bool', label: 'Markdown', help: 'Sends messages with parse_mode=Markdown; turn off to have text delivered verbatim.' },
+            { key: 'markdown', type: 'bool', label: 'Markdown' },
             { key: 'networkUseProxy', type: 'bool', label: 'Use network proxy' },
             { key: 'botToken', type: 'password', label: 'Bot token' },
             { key: 'listenMethod', type: 'select', label: 'Listen method', options: ['global', 'at'] }
@@ -92,7 +93,7 @@ const sections = [
         root: ['controllerMethod', 'email'],
         fields: [
             { key: 'enabled', type: 'bool', label: 'Enabled' },
-            { key: 'markdown', type: 'bool', label: 'Markdown', help: 'Send the formatted variant of the templates (code blocks, inline code).' },
+            { key: 'markdown', type: 'bool', label: 'Markdown' },
             { key: 'networkUseProxy', type: 'bool', label: 'Use network proxy' },
             { key: 'smtpHost', type: 'text', label: 'SMTP host' },
             { key: 'smtpPort', type: 'number', label: 'SMTP port' },
@@ -109,7 +110,7 @@ const sections = [
         root: ['controllerMethod', 'ntfy'],
         fields: [
             { key: 'enabled', type: 'bool', label: 'Enabled' },
-            { key: 'markdown', type: 'bool', label: 'Markdown', help: 'Send the formatted variant of the templates (code blocks, inline code).' },
+            { key: 'markdown', type: 'bool', label: 'Markdown' },
             { key: 'networkUseProxy', type: 'bool', label: 'Use network proxy' },
             { key: 'server', type: 'text', label: 'Server' },
             { key: 'topic', type: 'text', label: 'Topic' },
@@ -124,7 +125,7 @@ const sections = [
         root: ['controllerMethod', 'webhook'],
         fields: [
             { key: 'enabled', type: 'bool', label: 'Enabled' },
-            { key: 'markdown', type: 'bool', label: 'Markdown', help: 'Format the alert body with code blocks and inline code in the posted payload.' },
+            { key: 'markdown', type: 'bool', label: 'Markdown' },
             { key: 'networkUseProxy', type: 'bool', label: 'Use network proxy' },
             { key: 'url', type: 'text', label: 'URL' },
             { key: 'method', type: 'select', label: 'Method', options: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'] },
@@ -170,7 +171,6 @@ onMounted(load);
             <div>
                 <p class="eyebrow">Configuration</p>
                 <h1>System settings</h1>
-                <p class="lead">Edit the global <span class="mono">config.json</span>. Every card saves only its own section — other fields stay untouched.</p>
             </div>
             <div class="head-actions">
                 <button class="btn btn-ghost" @click="load"><i class="fas fa-rotate" :class="{ 'fa-spin': loading }" /> Reload</button>

frontend/src/views/Trusted.vue

@@ -6,7 +6,7 @@ import Toggle from '../components/Toggle.vue';
 import Modal from '../components/Modal.vue';
 
 const CHANNELS = [
-    { key: 'qq(napcat)', label: 'QQ (NapCat)', hint: 'Members are identified by QQ number / group number' },
+    { key: 'qq_onebot', label: 'QQ (OneBot)', hint: 'Members are identified by QQ number / group number' },
     { key: 'telegram', label: 'Telegram', hint: 'Members are identified by @username or numeric ID / group ID' }
 ];
 

frontend/src/views/WebHooks.vue

@@ -10,7 +10,7 @@ import Modal from '../components/Modal.vue';
 // controller names in config.json (controllerMethod.*), which is exactly what
 // the backend matches notifyPipes against.
 const CHANNELS = [
-    { key: 'qq(napcat)', label: 'QQ' },
+    { key: 'qq_onebot', label: 'QQ_OneBot' },
     { key: 'telegram', label: 'Telegram' },
     { key: 'email', label: 'Email' },
     { key: 'ntfy', label: 'ntfy' },

global/variables.go

@@ -14,9 +14,9 @@ type SoftwareInfoStr struct {
 
 var SoftwareInfo = SoftwareInfoStr{
 	Name:        "Nukumizu",
-	Version:     "0.2.0",
+	Version:     "0.2.2",
 	Developer:   "Madobi Nanami",
-	BuildVer:    5,
+	BuildVer:    7,
 	CommitHash:  "unknown",
 	Description: "Remote server monitoring and command execution subsystem for Komari",
 	BuildType:   "pre-release",

handler/server_test.go

@@ -51,13 +51,27 @@ func setupAdminToken() {
 	utils.AddToken("test-admin-token", 1, "admin", "tester")
 }
 
+// decodeResponse decodes a success envelope and returns its data object, which
+// the getInfo and getStatus handlers key by uuid. Responses are wrapped by
+// utils.SendSuccessResponse as {success, message?, data:{...}}, the shape the
+// console reads as `response.data[uuid]` (see frontend/src/api/index.js), so
+// the tests index the returned map by uuid rather than by envelope key.
 func decodeResponse(t *testing.T, w *httptest.ResponseRecorder) map[string]json.RawMessage {
 	t.Helper()
-	var body map[string]json.RawMessage
+	var body struct {
+		Success bool                       `json:"success"`
+		Data    map[string]json.RawMessage `json:"data"`
+	}
 	if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
 		t.Fatalf("decode response: %v; body=%s", err, w.Body.String())
 	}
-	return body
+	if !body.Success {
+		t.Fatalf("response is not a success envelope: %s", w.Body.String())
+	}
+	if body.Data == nil {
+		t.Fatalf("response has no data object: %s", w.Body.String())
+	}
+	return body.Data
 }
 
 func TestServerGetInfoAll(t *testing.T) {

handler/settings.go

@@ -47,6 +47,10 @@ func SettingsGetHandler(w http.ResponseWriter, r *http.Request) {
 //	{"system": {"debugMode": true}}
 //
 // Multiple entries may be given at once; only the provided keys are changed.
+//
+// The response carries data.restartRequired: the keys the update changed that
+// are only read at startup, so the caller can say which edits are not live yet.
+// It is empty for an update that took effect in full.
 func SettingsSetHandler(w http.ResponseWriter, r *http.Request) {
 	if !utils.Auth(w, r, "POST", "admin") {
 		return
@@ -80,7 +84,10 @@ func SettingsSetHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// The write landed either way. This only tells the caller which of the keys
+	// it changed will not be live until the program is restarted.
 	utils.SendSuccessResponse(w, "settings updated successfully", map[string]interface{}{
 		"type":            settingsType,
+		"restartRequired": config.IsRestartRequiredKeys(settingsType, patch),
 	})
 }

handler/settings_test.go

@@ -0,0 +1,128 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"nukumizu-backend/config"
+	"nukumizu-backend/global"
+)
+
+// tempConfigFile points one of the settings paths at a throwaway file, so a
+// test can drive the settings API without touching the config files in the
+// working directory.
+func tempConfigFile(t *testing.T, field *string, content string) {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "config.json")
+	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
+		t.Fatalf("write temp config: %v", err)
+	}
+	original := *field
+	*field = path
+	t.Cleanup(func() { *field = original })
+}
+
+// settingsSetRequest builds an authenticated POST for the settings endpoint.
+func settingsSetRequest(t *testing.T, settingsType, body string) *http.Request {
+	t.Helper()
+	req := httptest.NewRequest(
+		http.MethodPost,
+		"/api/settings/set?type="+settingsType,
+		strings.NewReader(body),
+	)
+	req.Header.Set("X-Token", "test-admin-token")
+	req.Header.Set("X-Timestamp", strconv.FormatInt(time.Now().Unix(), 10))
+	return req
+}
+
+// settingsSetResponse is the envelope /api/settings/set answers with.
+type settingsSetResponse struct {
+	Success bool `json:"success"`
+	Data    struct {
+		Type            string   `json:"type"`
+		RestartRequired []string `json:"restartRequired"`
+	} `json:"data"`
+}
+
+func decodeSettingsSetResponse(t *testing.T, w *httptest.ResponseRecorder) settingsSetResponse {
+	t.Helper()
+	var body settingsSetResponse
+	if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
+		t.Fatalf("decode response: %v; body=%s", err, w.Body.String())
+	}
+	return body
+}
+
+// TestSettingsSetReportsStartupOnlyKeys covers the field the console reads to
+// tell the user which of their edits are not live yet.
+func TestSettingsSetReportsStartupOnlyKeys(t *testing.T) {
+	setupAdminToken()
+	tempConfigFile(t, &global.ConfigPath.Global, `{"system":{"debugMode":false,"listenPort":"8080"}}`)
+
+	w := httptest.NewRecorder()
+	SettingsSetHandler(w, settingsSetRequest(t, "global",
+		`{"system":{"listenPort":"9090","debugMode":true}}`))
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d, body = %s", w.Code, w.Body.String())
+	}
+	body := decodeSettingsSetResponse(t, w)
+	if !body.Success {
+		t.Fatalf("not a success envelope: %s", w.Body.String())
+	}
+	if body.Data.Type != "global" {
+		t.Errorf("data.type = %q, want global", body.Data.Type)
+	}
+	if len(body.Data.RestartRequired) != 1 || body.Data.RestartRequired[0] != "system.listenPort" {
+		t.Errorf("restartRequired = %v, want [system.listenPort]", body.Data.RestartRequired)
+	}
+
+	// Being reported as startup-only must not stop the write.
+	data, err := config.GetSettings(config.SettingGlobal)
+	if err != nil {
+		t.Fatalf("GetSettings: %v", err)
+	}
+	for _, want := range []string{`"listenPort": "9090"`, `"debugMode": true`} {
+		if !strings.Contains(string(data), want) {
+			t.Errorf("the patch was not applied, missing %s:\n%s", want, data)
+		}
+	}
+}
+
+// TestSettingsSetRestartRequiredIsAlwaysAnArray pins the shape a client
+// iterates over: an update with nothing to report must answer [] and not null.
+func TestSettingsSetRestartRequiredIsAlwaysAnArray(t *testing.T) {
+	setupAdminToken()
+	tempConfigFile(t, &global.ConfigPath.Global, `{"system":{"debugMode":false}}`)
+
+	w := httptest.NewRecorder()
+	SettingsSetHandler(w, settingsSetRequest(t, "global", `{"system":{"debugMode":true}}`))
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d, body = %s", w.Code, w.Body.String())
+	}
+	if !strings.Contains(w.Body.String(), `"restartRequired":[]`) {
+		t.Errorf("restartRequired should serialize as an empty array: %s", w.Body.String())
+	}
+}
+
+// TestSettingsSetRejectsUnknownType keeps the failure path intact now that the
+// success path computes an extra field.
+func TestSettingsSetRejectsUnknownType(t *testing.T) {
+	setupAdminToken()
+	tempConfigFile(t, &global.ConfigPath.Global, `{}`)
+
+	w := httptest.NewRecorder()
+	SettingsSetHandler(w, settingsSetRequest(t, "nonsense", `{}`))
+
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("status = %d, want 400", w.Code)
+	}
+}

internal/controller/controller.go

@@ -3,8 +3,11 @@ package controller
 import (
 	"errors"
 	"fmt"
+	"reflect"
 	"strings"
 	"sync"
+	"sync/atomic"
+	"time"
 
 	"nukumizu-backend/config"
 	"nukumizu-backend/internal/node"
@@ -25,7 +28,7 @@ type Command struct {
 
 // Message represents a message to be sent by a controller.
 type Message struct {
-	Source  string // The source pipe (e.g., "telegram", "qq", "napcat")
+	Source  string // The source pipe (e.g., "telegram", "qq", "onebot")
 	Content string // The message content
 	ChatID  int64  // Chat/group ID where the message should be sent
 	Type    string // Message type (see MessageType*), used for per-member opt-outs
@@ -98,17 +101,45 @@ type Controller interface {
 
 // BotController is implemented by controllers that act as chat bots and can
 // deliver arbitrary messages, such as the bot initialization message on startup.
-// Only bot-type pipes (QQ/NapCat, Telegram) implement it; notification-only
+// Only bot-type pipes (QQ_OneBot, Telegram) implement it; notification-only
 // pipes (email, ntfy, webhook) do not.
 type BotController interface {
 	Controller
 	SendMessage(message Message) error
 }
 
+// flapPending is an Offline notification being held back for a node's
+// flap_tolerant window, in the hope that the node returns before the deadline.
+// The held change is kept by value so a later mutation of the caller's copy
+// cannot reach it.
+type flapPending struct {
+	timer  *time.Timer
+	change node.StatusChange
+}
+
 // Manager manages all controller instances and routes events.
 type Manager struct {
 	mu          sync.RWMutex
 	controllers map[string]Controller
+
+	// builtFrom records the controllerMethod section the registered controllers
+	// were built from, so a settings update that concerns them can be told apart
+	// from one that does not. It is read on the settings-update goroutine and
+	// written when the set is replaced.
+	builtFrom atomic.Pointer[config.ControllerMethodConfig]
+
+	// flapMu guards flapPending, the Offline notifications currently held for
+	// flap inhibition, keyed by node UUID. It is a separate lock from mu and is
+	// never held while mu is taken: a held notification is dispatched by a timer
+	// goroutine, which must not block behind a routing swap, and dispatching
+	// (network I/O per controller) must not happen while holding the flap lock.
+	flapMu      sync.Mutex
+	flapPending map[string]*flapPending
+
+	// flapToleranceFor overrides the per-node flap window. It is nil in
+	// production, where the value comes from bot_node_config.json through
+	// config.NodeFlapTolerant; tests set it to keep their timings hermetic.
+	flapToleranceFor func(uuid string) time.Duration
 }
 
 var globalManager *Manager
@@ -117,6 +148,7 @@ var globalManager *Manager
 func InitManager() {
 	globalManager = &Manager{
 		controllers: make(map[string]Controller),
+		flapPending: make(map[string]*flapPending),
 	}
 	postLog.Info("Controller manager initialized")
 }
@@ -126,16 +158,74 @@ func GetManager() *Manager {
 	return globalManager
 }
 
-// Register adds a controller to the manager.
+// NeedsRebuild reports whether next differs from the controllerMethod section
-func (m *Manager) Register(c Controller) {
+// the registered controllers were built from. A manager with no controllers yet
+// always reports true, so the first call installs the initial set.
+//
+// Controllers are rebuilt wholesale rather than reconfigured in place: each one
+// reads its settings into fields at construction, and two of them own
+// connections that cannot be re-pointed (the OneBot WebSocket listener is
+// stopped through a sync.Once, the Telegram polling context is created with the
+// controller). Replacing the set keeps every channel on the same footing.
+func (m *Manager) NeedsRebuild(next config.ControllerMethodConfig) bool {
+	built := m.builtFrom.Load()
+	if built == nil {
+		return true
+	}
+	// The section carries a header map and a recipient slice, so it is not
+	// comparable with ==.
+	return !reflect.DeepEqual(*built, next)
+}
+
+// ReplaceAll stops every registered controller and swaps in next, which the
+// caller built from method. It is the only way controllers are installed, at
+// startup and after a settings change alike.
+//
+// The swap happens under the registry lock so routing flips to the new set
+// atomically; stopping and starting happen outside it. Both can block — Stop
+// closes sockets, Start performs a handshake — and holding m.mu across them
+// would stall every notification for the duration.
+func (m *Manager) ReplaceAll(next []Controller, method config.ControllerMethodConfig) {
 	m.mu.Lock()
-	defer m.mu.Unlock()
+	previous := m.controllers
-	m.controllers[c.Name()] = c
+	m.controllers = make(map[string]Controller, len(next))
-	postLog.Info("Controller registered: " + c.Name())
+	for _, ctrl := range next {
+		m.controllers[ctrl.Name()] = ctrl
+	}
+	m.mu.Unlock()
+
+	m.builtFrom.Store(&method)
+
+	names := make([]string, 0, len(next))
+	for _, ctrl := range next {
+		names = append(names, ctrl.Name())
+	}
+	postLog.Info("Controller set installed: " + strings.Join(names, ", "))
+
+	for _, ctrl := range previous {
+		ctrl.Stop()
+	}
+
+	// Start off the calling goroutine, the way startup does: Telegram's getMe
+	// and the OneBot WebSocket handshake would otherwise hold the settings
+	// request open for as long as they take. The new controllers are already
+	// routable, and each one can send before Start returns.
+	for _, ctrl := range next {
+		go func(ctrl Controller) {
+			defer func() {
+				if r := recover(); r != nil {
+					postLog.Error(fmt.Sprintf("Controller %s panicked on start: %v", ctrl.Name(), r))
+				}
+			}()
+			if err := ctrl.Start(); err != nil {
+				postLog.Error(fmt.Sprintf("Failed to start controller %s: %v", ctrl.Name(), err))
+			}
+		}(ctrl)
+	}
 }
 
 // ShowBotInitMessage sends the bot initialization message to all enabled
-// bot controllers (QQ/NapCat and Telegram). Notification-only pipes that do
+// bot controllers (QQ_OneBot and Telegram). Notification-only pipes that do
 // not implement BotController are skipped. The message is typed
 // MessageTypeBotStarted so each controller can honor its members' per-recipient
 // EventBotStarted opt-out. It is rendered once per controller because the
@@ -144,7 +234,7 @@ func (m *Manager) ShowBotInitMessage() {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildBotInitializationMsgParams()
 
 	for _, ctrl := range m.controllers {
@@ -176,7 +266,7 @@ func (m *Manager) ShowBotServerList() {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 
 	for _, ctrl := range m.controllers {
@@ -202,12 +292,37 @@ func (m *Manager) ShowBotServerList() {
 // controllers. It honors the per-node allow-list in bot_node_config.json: a
 // node whose enableStatusNotify is not true is skipped entirely, so no
 // controller (chat bots or notification pipes) broadcasts its change.
+//
+// It also applies flap inhibition, the counterpart of the allow-list and read
+// from the same file: an Offline notification for a node with a positive
+// flap_tolerant is held back for that many seconds instead of being broadcast
+// (see holdOffline). Because both gates live here, every controller is subject
+// to them, chat bots and notification pipes alike.
 func (m *Manager) NotifyStatusChange(change node.StatusChange) {
 	if !config.NodeStatusNotifyEnabled(change.UUID) {
 		postLog.Debug(fmt.Sprintf("Status change for node %s skipped: enableStatusNotify is not enabled", change.UUID))
 		return
 	}
 
+	switch change.Event {
+	case "Offline":
+		if tolerance := m.flapTolerance(change.UUID); tolerance > 0 {
+			m.holdOffline(change, tolerance)
+			return
+		}
+	case "Online":
+		// A node that returns while its Offline is still held flaps: both
+		// halves of the pair are suppressed, and nothing is sent at all.
+		if m.releaseHeldOffline(change.UUID) {
+			return
+		}
+	}
+
+	m.dispatchStatusChange(change)
+}
+
+// dispatchStatusChange hands a change to every enabled controller.
+func (m *Manager) dispatchStatusChange(change node.StatusChange) {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
@@ -221,6 +336,116 @@ func (m *Manager) NotifyStatusChange(change node.StatusChange) {
 	}
 }
 
+// flapTolerance returns the flap-inhibition window for a node, honoring the
+// test override when one is set.
+func (m *Manager) flapTolerance(uuid string) time.Duration {
+	if m.flapToleranceFor != nil {
+		return m.flapToleranceFor(uuid)
+	}
+	return config.NodeFlapTolerant(uuid)
+}
+
+// holdOffline holds an Offline notification for the given window rather than
+// broadcasting it. If the node returns within the window, releaseHeldOffline
+// claims the held notification first and nothing is sent; otherwise the timer
+// claims it and the Offline goes out late (see fireHeldOffline).
+//
+// A held notification is claimed by removing it from flapPending under flapMu,
+// and the claim is decided by the identity of the map entry. That is what keeps
+// the two racers — the timer and a returning Online — from both winning:
+// whichever gets there first deletes the entry, and the loser finds it gone.
+func (m *Manager) holdOffline(change node.StatusChange, tolerance time.Duration) {
+	m.flapMu.Lock()
+	if m.flapPending == nil {
+		m.flapPending = make(map[string]*flapPending)
+	}
+	// Defensive: the tracker reports transitions, so a second Offline should
+	// not arrive for a node already held, but if one does the older hold is
+	// superseded — its callback loses the claim below and drops the change.
+	if old := m.flapPending[change.UUID]; old != nil {
+		old.timer.Stop()
+	}
+	held := &flapPending{change: change}
+	held.timer = time.AfterFunc(tolerance, func() {
+		m.fireHeldOffline(change.UUID, held)
+	})
+	m.flapPending[change.UUID] = held
+	m.flapMu.Unlock()
+
+	if flapEchoEnabled() {
+		postLog.Debug(fmt.Sprintf("Offline for node %s held for %s (flap tolerance)", change.UUID, tolerance))
+	}
+}
+
+// flapEchoEnabled reports whether the flap-inhibition log lines are emitted,
+// per the ShowFlapTolerantEcho debug flag. config.Current is nil before the
+// first configuration load — which includes every unit test that drives the
+// manager directly — so it is checked before the flag is read, the way the
+// other per-module debug flags are (see internal/controller/pipes/qq_onebot).
+func flapEchoEnabled() bool {
+	cfg := config.Current()
+	return cfg != nil && cfg.Debug.ShowFlapTolerantEcho
+}
+
+// fireHeldOffline dispatches a held Offline once its window has elapsed. It
+// claims the entry first and returns without sending if the hold was already
+// released or superseded, so a node that came back in time never reports an
+// Offline.
+func (m *Manager) fireHeldOffline(uuid string, held *flapPending) {
+	m.flapMu.Lock()
+	if m.flapPending[uuid] != held {
+		// Already claimed by a returning Online, or replaced by a newer hold.
+		m.flapMu.Unlock()
+		return
+	}
+	delete(m.flapPending, uuid)
+	m.flapMu.Unlock()
+
+	// Re-check the allow-list: it may have been edited while the change was
+	// held, and years-long holds are possible in principle.
+	if !config.NodeStatusNotifyEnabled(uuid) {
+		if flapEchoEnabled() {
+			postLog.Debug(fmt.Sprintf("Held status change for node %s dropped: enableStatusNotify is not enabled", uuid))
+		}
+		return
+	}
+
+	if flapEchoEnabled() {
+		postLog.Debug(fmt.Sprintf("Node %s still offline after flap tolerance; reporting it now", uuid))
+	}
+	m.dispatchStatusChange(held.change)
+}
+
+// releaseHeldOffline claims and cancels a held Offline notification, reporting
+// whether one was still pending. A true result means the node returned within
+// its flap window, so the caller must suppress the Online as well.
+//
+// Stop's return value is deliberately ignored: false also covers "the timer has
+// started firing but has not yet taken flapMu", which is not the same as
+// "already dispatched". Removing the entry is what decides the race, and it
+// makes the only possible outcomes "both halves sent" (the timer won, the node
+// really did stay down past the deadline) or "neither sent" — never an Offline
+// with no matching Online.
+func (m *Manager) releaseHeldOffline(uuid string) bool {
+	m.flapMu.Lock()
+	defer m.flapMu.Unlock()
+
+	if m.flapPending == nil {
+		return false
+	}
+	held := m.flapPending[uuid]
+	if held == nil {
+		return false
+	}
+	held.timer.Stop()
+	delete(m.flapPending, uuid)
+
+	if flapEchoEnabled() {
+		postLog.Debug(fmt.Sprintf("Node %s returned within flap tolerance; suppressing both halves", uuid))
+	}
+	return true
+}
+
 // NotifyAlert delivers an alert to the named pipes only, and returns the names
 // of the pipes it was handed to. A pipe that is unknown, disabled or fails to
 // send is reported through the returned error instead of stopping the delivery
@@ -274,8 +499,19 @@ func (m *Manager) IsMarkdown(pipeName string) bool {
 	return ctrl.IsMarkdown()
 }
 
-// StopAll stops all registered controllers.
+// StopAll stops all registered controllers. Held Offline notifications are
+// dropped first: their timers would otherwise fire against a shutting-down
+// controller set. A timer that has already claimed its entry can still be
+// dispatching concurrently, which is harmless — it reads the same registry
+// under the same lock.
 func (m *Manager) StopAll() {
+	m.flapMu.Lock()
+	for uuid, held := range m.flapPending {
+		held.timer.Stop()
+		delete(m.flapPending, uuid)
+	}
+	m.flapMu.Unlock()
+
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 	for _, ctrl := range m.controllers {

internal/controller/controller_test.go

@@ -0,0 +1,446 @@
+package controller
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+	"testing"
+	"time"
+
+	"nukumizu-backend/config"
+	"nukumizu-backend/internal/node"
+)
+
+// fakeController records the lifecycle calls it receives so a test can assert
+// what ReplaceAll did to it. Start signals on started, because ReplaceAll starts
+// controllers off the calling goroutine.
+type fakeController struct {
+	name    string
+	started chan struct{}
+
+	mu     sync.Mutex
+	starts int
+	stops  int
+}
+
+func newFake(name string) *fakeController {
+	return &fakeController{name: name, started: make(chan struct{}, 4)}
+}
+
+func (f *fakeController) Name() string     { return f.name }
+func (f *fakeController) IsEnabled() bool  { return true }
+func (f *fakeController) IsMarkdown() bool { return false }
+
+func (f *fakeController) Start() error {
+	f.mu.Lock()
+	f.starts++
+	f.mu.Unlock()
+	select {
+	case f.started <- struct{}{}:
+	default:
+	}
+	return nil
+}
+
+func (f *fakeController) Stop() {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.stops++
+}
+
+func (f *fakeController) lifecycle() (starts, stops int) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	return f.starts, f.stops
+}
+
+func (f *fakeController) SendStatusChange(node.StatusChange) error               { return nil }
+func (f *fakeController) SendServerList(string, string) error                    { return nil }
+func (f *fakeController) SendExecuteResult(string, string, string, string) error { return nil }
+func (f *fakeController) SendAlert(Alert) error                                  { return nil }
+
+// waitStarted blocks until the controller's Start has run.
+func (f *fakeController) waitStarted(t *testing.T) {
+	t.Helper()
+	select {
+	case <-f.started:
+	case <-time.After(5 * time.Second):
+		t.Fatalf("controller %s was never started", f.name)
+	}
+}
+
+func newTestManager() *Manager {
+	return &Manager{controllers: make(map[string]Controller)}
+}
+
+// routedTo returns the controller the manager currently routes the given name
+// to.
+func (m *Manager) routedTo(name string) Controller {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.controllers[name]
+}
+
+// heldOffline returns the Offline notification the manager is currently holding
+// for the given node, if any. It lets a test drive the hold/fire/release race
+// deterministically instead of racing a real timer.
+func (m *Manager) heldOffline(uuid string) *flapPending {
+	m.flapMu.Lock()
+	defer m.flapMu.Unlock()
+	return m.flapPending[uuid]
+}
+
+// recordingController keeps every status change it is handed, so a test can
+// assert on what actually reached the controllers. The embedded fakeController
+// satisfies the rest of the Controller interface.
+type recordingController struct {
+	*fakeController
+	changes chan node.StatusChange
+}
+
+func newRecording(name string) *recordingController {
+	return &recordingController{
+		fakeController: newFake(name),
+		changes:        make(chan node.StatusChange, 16),
+	}
+}
+
+func (r *recordingController) SendStatusChange(change node.StatusChange) error {
+	r.changes <- change
+	return nil
+}
+
+// awaitChange blocks until a status change reaches the controller, failing the
+// test rather than hanging if none does.
+func awaitChange(t *testing.T, rec *recordingController, what string) node.StatusChange {
+	t.Helper()
+	select {
+	case change := <-rec.changes:
+		return change
+	case <-time.After(5 * time.Second):
+		t.Fatalf("timed out waiting for the %s notification", what)
+		return node.StatusChange{}
+	}
+}
+
+// expectNoChange asserts that no status change reaches the controller for the
+// given window. Only a negative assertion needs a real wait; the manager has no
+// observable "decided to stay silent" event.
+func expectNoChange(t *testing.T, rec *recordingController, window time.Duration, what string) {
+	t.Helper()
+	select {
+	case change := <-rec.changes:
+		t.Fatalf("unexpected %s notification: %+v", what, change)
+	case <-time.After(window):
+	}
+}
+
+func offlineChange(uuid string) node.StatusChange {
+	return node.StatusChange{Event: "Offline", UUID: uuid, Name: uuid, OldOnline: true, NewOnline: false}
+}
+
+func onlineChange(uuid string) node.StatusChange {
+	return node.StatusChange{Event: "Online", UUID: uuid, Name: uuid, OldOnline: false, NewOnline: true}
+}
+
+// flapTestManager returns a manager with a recording controller installed and
+// the flap window stubbed to tolerance, so the tests never touch the global
+// bot_node_config.json or wait on real seconds. ReplaceAll makes the controller
+// routable before it starts it, so no start handshake is needed here.
+func flapTestManager(tolerance time.Duration) (*Manager, *recordingController) {
+	m := newTestManager()
+	m.flapToleranceFor = func(string) time.Duration { return tolerance }
+	rec := newRecording("recorder")
+	m.ReplaceAll([]Controller{rec}, config.ControllerMethodConfig{})
+	return m, rec
+}
+
+// TestFlapInhibitionSuppressesBothHalves is the core guarantee: a node that
+// returns inside its flap window produces no notification at all, so a flapping
+// node does not flood the controllers.
+func TestFlapInhibitionSuppressesBothHalves(t *testing.T) {
+	m, rec := flapTestManager(50 * time.Millisecond)
+
+	m.NotifyStatusChange(offlineChange("flappy"))
+	m.NotifyStatusChange(onlineChange("flappy"))
+
+	expectNoChange(t, rec, 300*time.Millisecond, "suppressed offline/online pair")
+
+	if held := m.heldOffline("flappy"); held != nil {
+		t.Error("the held offline notification was not released when the node returned")
+	}
+}
+
+// TestFlapInhibitionReportsLateOffline: a node still down when the window
+// elapses reports Offline as usual, however late the notification is.
+func TestFlapInhibitionReportsLateOffline(t *testing.T) {
+	m, rec := flapTestManager(50 * time.Millisecond)
+
+	m.NotifyStatusChange(offlineChange("down"))
+
+	if change := awaitChange(t, rec, "offline"); change.Event != "Offline" || change.UUID != "down" {
+		t.Errorf("got %+v, want the Offline change for node down", change)
+	}
+	if held := m.heldOffline("down"); held != nil {
+		t.Error("the held notification was still pending after it was dispatched")
+	}
+}
+
+// TestFlapInhibitionReportsRecoveryAfterWindow: once the Offline has gone out,
+// the node's eventual return is a genuine recovery and must be reported. This
+// is the honest half of the "both or neither, never Offline alone" rule.
+func TestFlapInhibitionReportsRecoveryAfterWindow(t *testing.T) {
+	m, rec := flapTestManager(50 * time.Millisecond)
+
+	m.NotifyStatusChange(offlineChange("down"))
+	if change := awaitChange(t, rec, "offline"); change.Event != "Offline" {
+		t.Fatalf("got %+v, want the Offline change", change)
+	}
+
+	m.NotifyStatusChange(onlineChange("down"))
+	if change := awaitChange(t, rec, "online"); change.Event != "Online" {
+		t.Errorf("got %+v, want the Online change", change)
+	}
+}
+
+// TestFlapInhibitionDisabledWithoutTolerance guards the previous behavior: with
+// no window (the default for every node), an Offline still goes out at once.
+func TestFlapInhibitionDisabledWithoutTolerance(t *testing.T) {
+	m, rec := flapTestManager(0)
+
+	m.NotifyStatusChange(offlineChange("plain"))
+
+	if change := awaitChange(t, rec, "offline"); change.Event != "Offline" {
+		t.Errorf("got %+v, want the Offline change", change)
+	}
+	if held := m.heldOffline("plain"); held != nil {
+		t.Error("a node without a flap window must not have a held notification")
+	}
+}
+
+// TestFlapInhibitionHonorsEnableStatusNotify pins the gate ordering: a node
+// whose notifications are switched off is skipped before any hold is taken, so
+// it cannot report a late Offline either.
+func TestFlapInhibitionHonorsEnableStatusNotify(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "bot_node_config.json")
+	content := `{"muted": {"enableStatusNotify": false, "flap_tolerant": 600}}`
+	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
+		t.Fatalf("write node config: %v", err)
+	}
+	if err := config.LoadBotNodeConfig(path); err != nil {
+		t.Fatalf("LoadBotNodeConfig: %v", err)
+	}
+	// Leave nothing behind for the other tests in this package, which reach the
+	// same package-global node config.
+	t.Cleanup(func() {
+		if err := config.LoadBotNodeConfig(filepath.Join(dir, "empty.json")); err != nil {
+			t.Errorf("reset node config: %v", err)
+		}
+	})
+
+	// The stub reports a window, so only the allow-list can be responsible for
+	// the silence.
+	m, rec := flapTestManager(time.Hour)
+	m.NotifyStatusChange(offlineChange("muted"))
+
+	expectNoChange(t, rec, 100*time.Millisecond, "offline for a muted node")
+	if held := m.heldOffline("muted"); held != nil {
+		t.Error("a muted node must not have its Offline held")
+	}
+}
+
+// TestFlapInhibitionClaimOrder pins both sides of the hold/fire/release race
+// deterministically, with a window long enough that the real timer never fires:
+// whichever claims the held notification first wins, and the loser sees it gone.
+func TestFlapInhibitionClaimOrder(t *testing.T) {
+	t.Run("release first suppresses the pair", func(t *testing.T) {
+		m, rec := flapTestManager(time.Hour)
+		m.NotifyStatusChange(offlineChange("node"))
+
+		held := m.heldOffline("node")
+		if held == nil {
+			t.Fatal("the offline notification was not held")
+		}
+		if !m.releaseHeldOffline("node") {
+			t.Fatal("releaseHeldOffline reported no pending notification")
+		}
+		// The timer goroutine loses the claim and must not dispatch.
+		m.fireHeldOffline("node", held)
+
+		expectNoChange(t, rec, 100*time.Millisecond, "notification after a release")
+	})
+
+	t.Run("fire first reports the offline alone", func(t *testing.T) {
+		m, rec := flapTestManager(time.Hour)
+		m.NotifyStatusChange(offlineChange("node"))
+
+		held := m.heldOffline("node")
+		if held == nil {
+			t.Fatal("the offline notification was not held")
+		}
+		m.fireHeldOffline("node", held)
+
+		if change := awaitChange(t, rec, "offline"); change.Event != "Offline" {
+			t.Errorf("got %+v, want the Offline change", change)
+		}
+		if m.releaseHeldOffline("node") {
+			t.Error("a fired notification must not be claimable again")
+		}
+	})
+}
+
+// TestStopAllDropsHeldNotifications: a hold must not outlive the controllers it
+// was meant for.
+func TestStopAllDropsHeldNotifications(t *testing.T) {
+	m, _ := flapTestManager(time.Hour)
+	m.NotifyStatusChange(offlineChange("node"))
+
+	m.StopAll()
+
+	if held := m.heldOffline("node"); held != nil {
+		t.Error("StopAll left a held offline notification armed")
+	}
+}
+
+func TestReplaceAllInstallsAndStarts(t *testing.T) {
+	m := newTestManager()
+	alpha, beta := newFake("alpha"), newFake("beta")
+
+	m.ReplaceAll([]Controller{alpha, beta}, config.ControllerMethodConfig{})
+
+	alpha.waitStarted(t)
+	beta.waitStarted(t)
+
+	if got := m.routedTo("alpha"); got != Controller(alpha) {
+		t.Errorf("alpha is not routable after ReplaceAll: %v", got)
+	}
+	if got := m.routedTo("beta"); got != Controller(beta) {
+		t.Errorf("beta is not routable after ReplaceAll: %v", got)
+	}
+}
+
+// TestReplaceAllStopsTheOutgoingSet is the invariant the rebuild relies on: the
+// old controllers must be shut down, or a rebuilt onebot or Telegram controller
+// would leave its previous connection running.
+func TestReplaceAllStopsTheOutgoingSet(t *testing.T) {
+	m := newTestManager()
+	outgoing := newFake("alpha")
+	m.ReplaceAll([]Controller{outgoing}, config.ControllerMethodConfig{})
+	outgoing.waitStarted(t)
+
+	incoming := newFake("alpha")
+	m.ReplaceAll([]Controller{incoming}, config.ControllerMethodConfig{})
+	incoming.waitStarted(t)
+
+	if starts, stops := outgoing.lifecycle(); starts != 1 || stops != 1 {
+		t.Errorf("outgoing controller lifecycle = %d starts / %d stops, want 1/1", starts, stops)
+	}
+	if _, stops := incoming.lifecycle(); stops != 0 {
+		t.Errorf("incoming controller was stopped %d times", stops)
+	}
+	if got := m.routedTo("alpha"); got != Controller(incoming) {
+		t.Error("routing still points at the outgoing controller")
+	}
+}
+
+func TestReplaceAllDropsChannelsLeftOut(t *testing.T) {
+	m := newTestManager()
+	m.ReplaceAll([]Controller{newFake("alpha"), newFake("beta")}, config.ControllerMethodConfig{})
+
+	m.ReplaceAll([]Controller{newFake("beta")}, config.ControllerMethodConfig{})
+
+	if got := m.routedTo("alpha"); got != nil {
+		t.Errorf("a channel missing from the new set is still routable: %v", got)
+	}
+	if got := m.routedTo("beta"); got == nil {
+		t.Error("the surviving channel is not routable")
+	}
+}
+
+func TestNeedsRebuild(t *testing.T) {
+	m := newTestManager()
+	base := config.ControllerMethodConfig{
+		Email: config.EmailConfig{Enabled: true, SMTPPort: 587, To: []string{"a@example.com"}},
+	}
+
+	if !m.NeedsRebuild(base) {
+		t.Error("a manager with nothing installed must report that a rebuild is needed")
+	}
+
+	m.ReplaceAll(nil, base)
+	if m.NeedsRebuild(base) {
+		t.Error("the settings the set was built from must not ask for another rebuild")
+	}
+
+	changed := base
+	changed.Email.Enabled = false
+	if !m.NeedsRebuild(changed) {
+		t.Error("a changed email setting must ask for a rebuild")
+	}
+
+	// The section carries maps and slices, so it is compared by value rather
+	// than by identity: equal content must not trigger a rebuild.
+	withHeaders := config.ControllerMethodConfig{
+		Webhook: config.WebhookConfig{Headers: map[string]string{"X-Token": "t"}},
+	}
+	m.ReplaceAll(nil, withHeaders)
+	equalHeaders := config.ControllerMethodConfig{
+		Webhook: config.WebhookConfig{Headers: map[string]string{"X-Token": "t"}},
+	}
+	if m.NeedsRebuild(equalHeaders) {
+		t.Error("equal header maps must not ask for a rebuild")
+	}
+
+	differentHeaders := config.ControllerMethodConfig{
+		Webhook: config.WebhookConfig{Headers: map[string]string{"X-Token": "other"}},
+	}
+	if !m.NeedsRebuild(differentHeaders) {
+		t.Error("a changed header must ask for a rebuild")
+	}
+}
+
+// TestReplaceAllDuringNotification drives ReplaceAll while notifications are
+// being routed. Run with -race: the swap replaces the map the routing path
+// reads, which is what the registry lock exists to make safe.
+func TestReplaceAllDuringNotification(t *testing.T) {
+	m := newTestManager()
+	m.ReplaceAll([]Controller{newFake("alpha")}, config.ControllerMethodConfig{})
+
+	var readers, writers sync.WaitGroup
+	stop := make(chan struct{})
+
+	for i := 0; i < 3; i++ {
+		readers.Add(1)
+		go func() {
+			defer readers.Done()
+			for {
+				select {
+				case <-stop:
+					return
+				default:
+				}
+				m.NotifyStatusChange(node.StatusChange{UUID: "u1", Name: "alpha", Event: "Online"})
+				_ = m.IsMarkdown("alpha")
+			}
+		}()
+	}
+
+	writers.Add(1)
+	go func() {
+		defer writers.Done()
+		for i := 0; i < 20; i++ {
+			m.ReplaceAll([]Controller{newFake("alpha"), newFake("beta")}, config.ControllerMethodConfig{})
+		}
+	}()
+
+	// Let the writer finish, then release the readers: they only return once
+	// stop is closed.
+	writers.Wait()
+	close(stop)
+	readers.Wait()
+
+	if got := m.routedTo("beta"); got == nil {
+		t.Error("the last installed set is not routable")
+	}
+}

internal/controller/pipes/email.go

@@ -2,6 +2,7 @@ package pipes
 
 import (
 	"fmt"
+	"net"
 
 	gomail "gopkg.in/mail.v2"
 
@@ -14,22 +15,34 @@ import (
 )
 
 // EmailController handles email notifications via SMTP.
+//
+// cfg is written once, by the constructor, and never again: a controller that
+// needs different settings is replaced wholesale by the manager rather than
+// reconfigured in place, so the send methods can read it without locking.
 type EmailController struct {
 	cfg config.EmailConfig
 }
 
 // NewEmailController creates a new Email controller.
 func NewEmailController(cfg config.EmailConfig) *EmailController {
-	if cfg.NetworkUseProxy {
+	applyEmailProxy(cfg.NetworkUseProxy)
-		// Route SMTP through the HTTP CONNECT proxy. NetDialTimeout is
-		// gomail's documented hook for overriding how the SMTP connection is
-		// dialed. There is a single global email channel, so overriding it
-		// unconditionally when the flag is set is safe.
-		gomail.NetDialTimeout = netproxy.DialWithTimeout(true)
-	}
 	return &EmailController{cfg: cfg}
 }
 
+// applyEmailProxy routes SMTP through the HTTP CONNECT proxy, or restores a
+// direct dial. gomail exposes the dial path as the package-level
+// NetDialTimeout, whose own default is net.DialTimeout, so turning the proxy
+// off has to put that back rather than leave the hook in place. There is a
+// single global email channel, so setting a package-level hook here is
+// unambiguous.
+func applyEmailProxy(useProxy bool) {
+	if useProxy {
+		gomail.NetDialTimeout = netproxy.DialWithTimeout(true)
+		return
+	}
+	gomail.NetDialTimeout = net.DialTimeout
+}
+
 // Name returns the controller name.
 func (e *EmailController) Name() string {
 	return "email"
@@ -71,7 +84,7 @@ func (e *EmailController) SendStatusChange(change node.StatusChange) error {
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromStatusChange(change)
 	body := template.Render(cfg.ControllerMessage.ServerStatusChanged, params, e.cfg.Markdown)
 
@@ -85,7 +98,7 @@ func (e *EmailController) SendServerList(onlineServers, offlineServers string) e
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	body := template.Render(cfg.ControllerMessage.ServerList, params, e.cfg.Markdown)
 
@@ -98,7 +111,7 @@ func (e *EmailController) SendExecuteResult(serverName, serverUUID, command, res
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
 	body := template.Render(cfg.ControllerMessage.ServerExecuteResult, params, e.cfg.Markdown)
 

internal/controller/pipes/email_proxy_test.go

@@ -0,0 +1,54 @@
+package pipes
+
+import (
+	"net"
+	"reflect"
+	"testing"
+
+	gomail "gopkg.in/mail.v2"
+
+	"nukumizu-backend/config"
+)
+
+// dialerIsDefault reports whether gomail still dials directly. Function values
+// are not comparable in Go, so the code pointers are compared instead.
+func dialerIsDefault() bool {
+	return reflect.ValueOf(gomail.NetDialTimeout).Pointer() ==
+		reflect.ValueOf(net.DialTimeout).Pointer()
+}
+
+// TestApplyEmailProxyRestoresDefaultDialer covers the case the constructor used
+// to get wrong. gomail exposes its dial hook as a package-level variable with no
+// unset, and the code only installed the proxy dialer when the flag was set, so
+// turning networkUseProxy back off left SMTP tunnelled through a proxy nobody
+// had asked for — with no way to undo it short of a restart.
+func TestApplyEmailProxyRestoresDefaultDialer(t *testing.T) {
+	t.Cleanup(func() { gomail.NetDialTimeout = net.DialTimeout })
+
+	applyEmailProxy(true)
+	if dialerIsDefault() {
+		t.Fatal("applyEmailProxy(true) did not install the proxy dialer")
+	}
+
+	applyEmailProxy(false)
+	if !dialerIsDefault() {
+		t.Error("applyEmailProxy(false) left the proxy dialer in place")
+	}
+}
+
+// TestNewEmailControllerAppliesProxySetting pins that the dialer follows the
+// settings a controller is built with, which is what makes a rebuilt controller
+// pick up a changed proxy flag.
+func TestNewEmailControllerAppliesProxySetting(t *testing.T) {
+	t.Cleanup(func() { gomail.NetDialTimeout = net.DialTimeout })
+
+	NewEmailController(config.EmailConfig{NetworkUseProxy: true})
+	if dialerIsDefault() {
+		t.Error("a controller built with networkUseProxy: true did not install the proxy dialer")
+	}
+
+	NewEmailController(config.EmailConfig{NetworkUseProxy: false})
+	if !dialerIsDefault() {
+		t.Error("a controller rebuilt with networkUseProxy: false left the proxy dialer in place")
+	}
+}

internal/controller/pipes/ntfy.go

@@ -15,6 +15,11 @@ import (
 )
 
 // NtfyController handles notifications via ntfy.sh or a self-hosted ntfy server.
+//
+// cfg and httpClient are written once, by the constructor, and never again: a
+// controller that needs different settings is replaced wholesale by the manager
+// rather than reconfigured in place, so the send methods can read them without
+// locking.
 type NtfyController struct {
 	cfg        config.NtfyConfig
 	httpClient *http.Client
@@ -65,7 +70,7 @@ func (n *NtfyController) SendStatusChange(change node.StatusChange) error {
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromStatusChange(change)
 	message := template.Render(cfg.ControllerMessage.ServerStatusChanged, params, n.cfg.Markdown)
 
@@ -79,7 +84,7 @@ func (n *NtfyController) SendServerList(onlineServers, offlineServers string) er
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	message := template.Render(cfg.ControllerMessage.ServerList, params, n.cfg.Markdown)
 
@@ -92,7 +97,7 @@ func (n *NtfyController) SendExecuteResult(serverName, serverUUID, command, resu
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
 	message := template.Render(cfg.ControllerMessage.ServerExecuteResult, params, n.cfg.Markdown)
 

internal/controller/pipes/qq_napcat/napcat.go

@@ -1,321 +0,0 @@
-package qq_napcat
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"sync"
-	"time"
-
-	"github.com/gorilla/websocket"
-
-	"nukumizu-backend/config"
-	"nukumizu-backend/internal/netproxy"
-	"nukumizu-backend/postLog"
-)
-
-// APIResponse mirrors NapCat's HTTP API response envelope.
-type APIResponse struct {
-	Status  string          `json:"status"`
-	RetCode int             `json:"retcode"`
-	Message string          `json:"message"`
-	Data    json.RawMessage `json:"data"`
-}
-
-// Client is the HTTP + WebSocket client for a single NapCat instance.
-// It both listens for incoming OneBot events over WebSocket and issues
-// outbound NapCat API calls over HTTP.
-type Client struct {
-	addr       string
-	port       string
-	token      string
-	useProxy   bool
-	httpClient *http.Client
-
-	connMu   sync.Mutex
-	conn     *websocket.Conn
-	stopCh   chan struct{}
-	stopOnce sync.Once
-}
-
-// NewClient creates a NapCat client for the given host/port/token. When
-// useProxy is set, HTTP API calls and the WebSocket connection are routed
-// through the system-wide network proxy.
-func NewClient(addr, port, token string, useProxy bool) *Client {
-	return &Client{
-		addr:       addr,
-		port:       port,
-		token:      token,
-		useProxy:   useProxy,
-		httpClient: netproxy.HTTPClient(useProxy, 30*time.Second),
-		stopCh:     make(chan struct{}),
-	}
-}
-
-func (c *Client) baseURL() string {
-	return fmt.Sprintf("http://%s:%s", c.addr, c.port)
-}
-
-// sendRequest performs an HTTP call to NapCat, injecting access_token into POST
-// bodies AND setting Authorization: Bearer (compatible with HTTP Server adapters
-// created in the NapCat Web UI).
-func (c *Client) sendRequest(method, endpoint string, body []byte) ([]byte, error) {
-	url := c.baseURL() + endpoint
-
-	// For POST requests, inject access_token into the JSON body before sending.
-	var finalBody []byte
-	if body != nil && c.token != "" {
-		var bodyMap map[string]interface{}
-		if err := json.Unmarshal(body, &bodyMap); err == nil {
-			bodyMap["access_token"] = c.token
-			finalBody, _ = json.Marshal(bodyMap)
-		}
-	}
-	if finalBody == nil {
-		finalBody = body
-	}
-
-	var req *http.Request
-	var err error
-	if finalBody != nil {
-		req, err = http.NewRequest(method, url, bytes.NewReader(finalBody))
-	} else {
-		req, err = http.NewRequest(method, url, nil)
-	}
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	req.Header.Set("Content-Type", "application/json")
-	if c.token != "" {
-		req.Header.Set("Authorization", "Bearer "+c.token)
-	}
-
-	resp, err := c.httpClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("failed to send request to napcat: %w", err)
-	}
-	defer resp.Body.Close()
-
-	respBody, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read napcat response: %w", err)
-	}
-
-	return respBody, nil
-}
-
-// parseResponse unmarshals NapCat's raw response body into an APIResponse.
-func (c *Client) parseResponse(respBody []byte, caller string) (*APIResponse, error) {
-	var napcatResp APIResponse
-	if err := json.Unmarshal(respBody, &napcatResp); err != nil {
-		return nil, fmt.Errorf("failed to unmarshal napcat response (%s): %w\n%s", caller, err, string(respBody))
-	}
-	return &napcatResp, nil
-}
-
-// SendMsg sends a message via NapCat.
-// targetType: "group" or "private"
-// targetID: QQ group ID or user ID
-// msg: message content
-// hasAt: whether to prepend an @mention
-// atTargetID: the QQ ID to @mention
-func (c *Client) SendMsg(targetType string, targetID int64, msg string, hasAt bool, atTargetID int64) (*APIResponse, error) {
-	// Build message with optional @mention.
-	message := msg
-	if hasAt && atTargetID > 0 {
-		message = fmt.Sprintf("[CQ:at,qq=%d] %s", atTargetID, msg)
-	}
-
-	var endpoint string
-	var napcatReq map[string]interface{}
-
-	switch targetType {
-	case "group":
-		endpoint = "/send_group_msg"
-		napcatReq = map[string]interface{}{
-			"group_id": targetID,
-			"message":  message,
-		}
-	case "private":
-		endpoint = "/send_private_msg"
-		napcatReq = map[string]interface{}{
-			"user_id": targetID,
-			"message": message,
-		}
-	default:
-		return nil, fmt.Errorf("invalid targetType: %s, must be 'group' or 'private'", targetType)
-	}
-
-	reqBody, err := json.Marshal(napcatReq)
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal request: %w", err)
-	}
-
-	if config.C_globalConfig.Debug.ShowNapcatAction {
-		postLog.Debug(fmt.Sprintf("[Napcat] SendMsg -> %s (%s): %s", endpoint, targetType, message))
-	}
-
-	respBody, err := c.sendRequest(http.MethodPost, endpoint, reqBody)
-	if err != nil {
-		return nil, err
-	}
-
-	return c.parseResponse(respBody, "SendMsg")
-}
-
-// RecallMsg recalls (deletes) a sent message via NapCat.
-func (c *Client) RecallMsg(msgID int64) (*APIResponse, error) {
-	reqBody, err := json.Marshal(map[string]interface{}{
-		"message_id": msgID,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal request: %w", err)
-	}
-
-	if config.C_globalConfig.Debug.ShowNapcatAction {
-		postLog.Debug(fmt.Sprintf("[Napcat] RecallMsg -> /delete_msg: %d", msgID))
-	}
-
-	respBody, err := c.sendRequest(http.MethodPost, "/delete_msg", reqBody)
-	if err != nil {
-		return nil, err
-	}
-
-	return c.parseResponse(respBody, "RecallMsg")
-}
-
-// GetGroupList retrieves the list of joined groups from NapCat.
-func (c *Client) GetGroupList() (*APIResponse, error) {
-	if config.C_globalConfig.Debug.ShowNapcatAction {
-		postLog.Debug("[Napcat] GetGroupList -> /get_group_list")
-	}
-
-	respBody, err := c.sendRequest(http.MethodGet, "/get_group_list", nil)
-	if err != nil {
-		return nil, err
-	}
-
-	return c.parseResponse(respBody, "GetGroupList")
-}
-
-// GetGroupInfo retrieves detailed information about a specific group from NapCat.
-func (c *Client) GetGroupInfo(groupID int64) (*APIResponse, error) {
-	reqBody, err := json.Marshal(map[string]interface{}{
-		"group_id": groupID,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal request: %w", err)
-	}
-
-	if config.C_globalConfig.Debug.ShowNapcatAction {
-		postLog.Debug(fmt.Sprintf("[Napcat] GetGroupInfo -> /get_group_info: %d", groupID))
-	}
-
-	respBody, err := c.sendRequest(http.MethodPost, "/get_group_info", reqBody)
-	if err != nil {
-		return nil, err
-	}
-
-	return c.parseResponse(respBody, "GetGroupInfo")
-}
-
-// GetFriendsList retrieves the friends list from NapCat.
-func (c *Client) GetFriendsList() (*APIResponse, error) {
-	if config.C_globalConfig.Debug.ShowNapcatAction {
-		postLog.Debug("[Napcat] GetFriendsList -> /get_friend_list")
-	}
-
-	respBody, err := c.sendRequest(http.MethodGet, "/get_friend_list", nil)
-	if err != nil {
-		return nil, err
-	}
-
-	return c.parseResponse(respBody, "GetFriendsList")
-}
-
-// Listen connects to the NapCat WebSocket server and calls onEvent for every raw
-// message. It blocks forever, reconnecting every 5s after a disconnect, until
-// Stop is called. Run it in a goroutine.
-func (c *Client) Listen(onEvent func(raw []byte)) {
-	for {
-		select {
-		case <-c.stopCh:
-			return
-		default:
-		}
-
-		c.listenOnce(onEvent)
-
-		postLog.Warning("[Napcat] WebSocket disconnected, reconnecting in 5s...")
-		select {
-		case <-c.stopCh:
-			return
-		case <-time.After(5 * time.Second):
-		}
-	}
-}
-
-// listenOnce connects to the NapCat WebSocket and reads events until the
-// connection drops or Stop is called.
-func (c *Client) listenOnce(onEvent func(raw []byte)) {
-	wsURL := fmt.Sprintf("ws://%s:%s/", c.addr, c.port)
-	header := http.Header{}
-	if c.token != "" {
-		wsURL += "?access_token=" + url.QueryEscape(c.token)
-		header.Set("Authorization", "Bearer "+c.token)
-	}
-
-	dialer := *websocket.DefaultDialer
-	dialer.Proxy = netproxy.ProxyFunc(c.useProxy)
-	conn, _, err := dialer.Dial(wsURL, header)
-	if err != nil {
-		postLog.Error(fmt.Sprintf("[Napcat] Failed to connect to NapCat WebSocket: %v", err))
-		return
-	}
-
-	c.connMu.Lock()
-	c.conn = conn
-	c.connMu.Unlock()
-	defer func() {
-		c.connMu.Lock()
-		if c.conn == conn {
-			c.conn = nil
-		}
-		c.connMu.Unlock()
-		conn.Close()
-	}()
-
-	postLog.Info(fmt.Sprintf("[Napcat] Connected to NapCat WebSocket at %s", wsURL))
-
-	for {
-		select {
-		case <-c.stopCh:
-			return
-		default:
-		}
-
-		_, msgBytes, err := conn.ReadMessage()
-		if err != nil {
-			postLog.Error(fmt.Sprintf("[Napcat] WebSocket read error: %v", err))
-			return
-		}
-
-		onEvent(msgBytes)
-	}
-}
-
-// Stop closes any open WebSocket connection and unblocks the Listen reconnect loop.
-func (c *Client) Stop() {
-	c.stopOnce.Do(func() { close(c.stopCh) })
-
-	c.connMu.Lock()
-	defer c.connMu.Unlock()
-	if c.conn != nil {
-		c.conn.Close()
-		c.conn = nil
-	}
-}

internal/controller/pipes/qq_onebot/onebot.go

@@ -0,0 +1,562 @@
+package qq_onebot
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/gorilla/websocket"
+
+	"nukumizu-backend/config"
+	"nukumizu-backend/internal/netproxy"
+	"nukumizu-backend/postLog"
+)
+
+const (
+	// onebotReconnectDelay is the pause between reconnect attempts, shared by the
+	// event socket and the API socket.
+	onebotReconnectDelay = 5 * time.Second
+	// onebotAPITimeout bounds one callAPI response wait. It matches the timeout the
+	// removed HTTP client (netproxy.HTTPClient(useProxy, 30s)) imposed, so callers
+	// see the same worst-case latency they always did.
+	onebotAPITimeout = 30 * time.Second
+	// onebotConnectWait bounds how long callAPI waits for the API socket to come up
+	// when it is not connected yet. It is deliberately short: the startup bot
+	// initialization message is sent on the main goroutine, and a down OneBot
+	// server must not stall HTTP-server startup for the full API timeout.
+	onebotConnectWait = 5 * time.Second
+	// onebotWriteTimeout bounds a single socket write so a wedged peer cannot block
+	// the caller (and, through writeMu, every other writer) indefinitely.
+	onebotWriteTimeout = 10 * time.Second
+)
+
+// actionLogEnabled reports whether the OneBot API methods echo each action they
+// send, per the showOneBotAction toggle. Unlike the WebSocket message path in
+// qq.go it deliberately does not also require debugMode: these methods have
+// always logged on this toggle alone, and preserving that is intentional.
+func actionLogEnabled() bool {
+	cfg := config.Current()
+	return cfg != nil && cfg.Debug.ShowOneBotAction
+}
+
+// APIResponse mirrors OneBot's API response envelope. Echo is the correlation id
+// the client sent, echoed back by the server; callAPI uses it internally to match
+// a response to its request. Data stays raw so callers decode get_group_list /
+// get_friend_list arrays themselves.
+type APIResponse struct {
+	Status  string          `json:"status"`
+	RetCode int             `json:"retcode"`
+	Message string          `json:"message"`
+	Data    json.RawMessage `json:"data"`
+	Echo    json.RawMessage `json:"echo"`
+}
+
+// apiRequest is one OneBot API call written to the API socket. A struct rather
+// than a map guarantees Echo is encoded as a JSON string, which is what the
+// server sends back verbatim.
+type apiRequest struct {
+	Action string                 `json:"action"`
+	Params map[string]interface{} `json:"params"`
+	Echo   string                 `json:"echo"`
+}
+
+// apiResult carries one decoded API response (or a transport error) from the API
+// read loop back to the callAPI invocation waiting on its echo.
+type apiResult struct {
+	resp *APIResponse
+	err  error
+}
+
+// Client is the WebSocket client for a single OneBot instance. It uses two
+// forward-WebSocket connections, per the OneBot 11 split between events and API
+// calls:
+//
+//   - the event socket ("/") only reads: one goroutine feeds every frame to
+//     onEvent. Nothing is ever written to it.
+//   - the API socket ("/api") only issues actions: callAPI writes a
+//     {"action","params","echo"} frame there, and its dedicated read loop matches
+//     the reply by echo.
+//
+// They must be separate: qq.go's event handler replies with SendMsg from inside
+// the event read loop, so reading API responses on that same socket would
+// deadlock (the loop would be blocked in the handler, waiting on a response only
+// it could deliver).
+type Client struct {
+	addr     string
+	port     string
+	token    string
+	useProxy bool
+
+	// Event socket ("/"): one reader (listenOnce), closed only by Stop or its own
+	// cleanup, never written to.
+	connMu sync.Mutex
+	conn   *websocket.Conn
+
+	// API socket ("/api"). apiMu guards the pointer, the epoch channel and the
+	// pending table; writeMu serializes the actual socket writes, so apiMu is
+	// never held across I/O (which would stall response dispatch behind a slow
+	// write).
+	apiMu      sync.Mutex
+	apiConn    *websocket.Conn
+	apiChanged chan struct{} // closed and replaced on every connect/disconnect
+	writeMu    sync.Mutex
+	pending    map[string]chan apiResult
+	echoSeq    atomic.Uint64
+	stopped    bool
+
+	stopCh   chan struct{}
+	stopOnce sync.Once
+}
+
+// NewClient creates a OneBot client for the given host/port/token. When useProxy
+// is set, both WebSocket connections are routed through the system-wide network
+// proxy. It performs no I/O; Listen starts the sockets.
+func NewClient(addr, port, token string, useProxy bool) *Client {
+	return &Client{
+		addr:       addr,
+		port:       port,
+		token:      token,
+		useProxy:   useProxy,
+		apiChanged: make(chan struct{}),
+		pending:    make(map[string]chan apiResult),
+		stopCh:     make(chan struct{}),
+	}
+}
+
+// dialWS opens one forward-WebSocket connection to the given path. The token is
+// passed both as an access_token query parameter and as an Authorization: Bearer
+// header (forward adapters check one or the other), and the dial goes through the
+// system proxy when useProxy is set.
+func (c *Client) dialWS(path string) (*websocket.Conn, error) {
+	wsURL := fmt.Sprintf("ws://%s:%s%s", c.addr, c.port, path)
+	header := http.Header{}
+	if c.token != "" {
+		wsURL += "?access_token=" + url.QueryEscape(c.token)
+		header.Set("Authorization", "Bearer "+c.token)
+	}
+
+	dialer := *websocket.DefaultDialer
+	dialer.Proxy = netproxy.ProxyFunc(c.useProxy)
+	conn, _, err := dialer.Dial(wsURL, header)
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to onebot websocket %s: %w", path, err)
+	}
+	return conn, nil
+}
+
+// SendMsg sends a message via OneBot.
+// targetType: "group" or "private"
+// targetID: QQ group ID or user ID
+// msg: message content
+// hasAt: whether to prepend an @mention
+// atTargetID: the QQ ID to @mention
+func (c *Client) SendMsg(targetType string, targetID int64, msg string, hasAt bool, atTargetID int64) (*APIResponse, error) {
+	// Build message with optional @mention.
+	message := msg
+	if hasAt && atTargetID > 0 {
+		message = fmt.Sprintf("[CQ:at,qq=%d] %s", atTargetID, msg)
+	}
+
+	var action string
+	var params map[string]interface{}
+
+	switch targetType {
+	case "group":
+		action = "send_group_msg"
+		params = map[string]interface{}{
+			"group_id": targetID,
+			"message":  message,
+		}
+	case "private":
+		action = "send_private_msg"
+		params = map[string]interface{}{
+			"user_id": targetID,
+			"message": message,
+		}
+	default:
+		return nil, fmt.Errorf("invalid targetType: %s, must be 'group' or 'private'", targetType)
+	}
+
+	if actionLogEnabled() {
+		postLog.Debug(fmt.Sprintf("[qq_onebot] SendMsg -> %s (%s): %s", action, targetType, message))
+	}
+
+	return c.callAPI(action, params)
+}
+
+// RecallMsg recalls (deletes) a sent message via OneBot.
+func (c *Client) RecallMsg(msgID int64) (*APIResponse, error) {
+	if actionLogEnabled() {
+		postLog.Debug(fmt.Sprintf("[qq_onebot] RecallMsg -> delete_msg: %d", msgID))
+	}
+
+	return c.callAPI("delete_msg", map[string]interface{}{"message_id": msgID})
+}
+
+// GetGroupList retrieves the list of joined groups from OneBot.
+func (c *Client) GetGroupList() (*APIResponse, error) {
+	if actionLogEnabled() {
+		postLog.Debug("[qq_onebot] GetGroupList -> get_group_list")
+	}
+
+	return c.callAPI("get_group_list", nil)
+}
+
+// GetGroupInfo retrieves detailed information about a specific group from OneBot.
+func (c *Client) GetGroupInfo(groupID int64) (*APIResponse, error) {
+	if actionLogEnabled() {
+		postLog.Debug(fmt.Sprintf("[qq_onebot] GetGroupInfo -> get_group_info: %d", groupID))
+	}
+
+	return c.callAPI("get_group_info", map[string]interface{}{"group_id": groupID})
+}
+
+// GetFriendsList retrieves the friends list from OneBot.
+func (c *Client) GetFriendsList() (*APIResponse, error) {
+	if actionLogEnabled() {
+		postLog.Debug("[qq_onebot] GetFriendsList -> get_friend_list")
+	}
+
+	return c.callAPI("get_friend_list", nil)
+}
+
+// callAPI issues one OneBot action over the API socket and waits for its reply.
+//
+// It returns a Go error only for transport failures (not connected, write error,
+// disconnect, timeout, Stop). An OneBot-level failure (status "failed", retcode
+// 1xxx) is returned as an ordinary (*APIResponse, nil), matching the behavior of
+// the HTTP client this replaces.
+func (c *Client) callAPI(action string, params map[string]interface{}) (*APIResponse, error) {
+	// The spec allows omitting params entirely, but some adapters reject a null
+	// value, so a bodyless action still sends an empty object.
+	if params == nil {
+		params = map[string]interface{}{}
+	}
+	echo := strconv.FormatUint(c.echoSeq.Add(1), 10)
+
+	payload, err := json.Marshal(apiRequest{Action: action, Params: params, Echo: echo})
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal onebot request: %w", err)
+	}
+
+	// Buffered cap 1: the API read loop and failPending can each deliver at most
+	// once, and delivering must never block the read loop.
+	ch := make(chan apiResult, 1)
+
+	c.apiMu.Lock()
+	if c.stopped {
+		c.apiMu.Unlock()
+		return nil, fmt.Errorf("onebot client stopped")
+	}
+	c.pending[echo] = ch
+	c.apiMu.Unlock()
+
+	// Deregister on every exit path. dispatchAPI deletes the entry too, so this is
+	// a no-op when the response already arrived.
+	defer func() {
+		c.apiMu.Lock()
+		delete(c.pending, echo)
+		c.apiMu.Unlock()
+	}()
+
+	conn, err := c.waitForAPIConn()
+	if err != nil {
+		return nil, err
+	}
+
+	if err := c.writeAPI(conn, payload); err != nil {
+		return nil, fmt.Errorf("failed to send onebot request: %w", err)
+	}
+
+	timer := time.NewTimer(onebotAPITimeout)
+	defer timer.Stop()
+
+	select {
+	case res := <-ch:
+		return res.resp, res.err
+	case <-timer.C:
+		return nil, fmt.Errorf("onebot API %s timed out after %s", action, onebotAPITimeout)
+	case <-c.stopCh:
+		return nil, fmt.Errorf("onebot client stopped")
+	}
+}
+
+// waitForAPIConn returns the live API connection, waiting (bounded by
+// onebotConnectWait, or until Stop) for apiLoop to establish one when it is not
+// connected yet. It re-checks the state on every apiChanged transition, so a
+// closed channel left over from a previous connection cannot fool it.
+func (c *Client) waitForAPIConn() (*websocket.Conn, error) {
+	timer := time.NewTimer(onebotConnectWait)
+	defer timer.Stop()
+
+	for {
+		c.apiMu.Lock()
+		conn := c.apiConn
+		changed := c.apiChanged
+		stopped := c.stopped
+		c.apiMu.Unlock()
+
+		if conn != nil {
+			return conn, nil
+		}
+		if stopped {
+			return nil, fmt.Errorf("onebot client stopped")
+		}
+
+		select {
+		case <-changed:
+			// Connection state changed; re-check.
+		case <-timer.C:
+			return nil, fmt.Errorf("onebot API WebSocket not connected")
+		case <-c.stopCh:
+			return nil, fmt.Errorf("onebot client stopped")
+		}
+	}
+}
+
+// writeAPI serializes one request frame onto conn under writeMu, with a write
+// deadline. gorilla/websocket panics on concurrent writes, and both the event
+// handler and every SendMessage path call callAPI, so concurrency is the norm.
+func (c *Client) writeAPI(conn *websocket.Conn, payload []byte) error {
+	c.writeMu.Lock()
+	defer c.writeMu.Unlock()
+
+	if err := conn.SetWriteDeadline(time.Now().Add(onebotWriteTimeout)); err != nil {
+		return err
+	}
+	return conn.WriteMessage(websocket.TextMessage, payload)
+}
+
+// Listen connects the event WebSocket and calls onEvent for every raw message. It
+// starts the API socket loop as well, since NewClient is side-effect-free and
+// Listen is the single entry point the controller drives. It blocks forever,
+// reconnecting every onebotReconnectDelay after a disconnect, until Stop is
+// called. Run it in a goroutine.
+func (c *Client) Listen(onEvent func(raw []byte)) {
+	go c.apiLoop()
+
+	for {
+		select {
+		case <-c.stopCh:
+			return
+		default:
+		}
+
+		c.listenOnce(onEvent)
+
+		postLog.Warning("[qq_onebot] Event WebSocket disconnected, reconnecting in 5s...")
+		select {
+		case <-c.stopCh:
+			return
+		case <-time.After(onebotReconnectDelay):
+		}
+	}
+}
+
+// listenOnce connects to the OneBot event WebSocket and reads events until the
+// connection drops or Stop is called.
+func (c *Client) listenOnce(onEvent func(raw []byte)) {
+	conn, err := c.dialWS("/")
+	if err != nil {
+		postLog.Error(fmt.Sprintf("[qq_onebot] Failed to connect to OneBot event WebSocket: %v", err))
+		return
+	}
+
+	c.connMu.Lock()
+	c.conn = conn
+	c.connMu.Unlock()
+	defer func() {
+		c.connMu.Lock()
+		if c.conn == conn {
+			c.conn = nil
+		}
+		c.connMu.Unlock()
+		conn.Close()
+	}()
+
+	postLog.Info("[qq_onebot] Connected to OneBot event WebSocket")
+
+	for {
+		select {
+		case <-c.stopCh:
+			return
+		default:
+		}
+
+		_, msgBytes, err := conn.ReadMessage()
+		if err != nil {
+			postLog.Error(fmt.Sprintf("[qq_onebot] Event WebSocket read error: %v", err))
+			return
+		}
+
+		onEvent(msgBytes)
+	}
+}
+
+// apiLoop owns the API socket: it keeps a connection to "/api" up, dispatching
+// any reply its read loop receives and reconnecting every onebotReconnectDelay.
+// It exits on Stop.
+func (c *Client) apiLoop() {
+	for {
+		select {
+		case <-c.stopCh:
+			return
+		default:
+		}
+
+		c.runAPIConnection()
+
+		select {
+		case <-c.stopCh:
+			return
+		case <-time.After(onebotReconnectDelay):
+		}
+	}
+}
+
+// runAPIConnection dials "/api", publishes the connection to waiters, and reads
+// response frames until the connection drops or Stop is called. On the way out it
+// marks the socket down (waking waiters and failing in-flight calls) so a caller
+// does not wait the full timeout for a reply that can no longer arrive.
+func (c *Client) runAPIConnection() {
+	conn, err := c.dialWS("/api")
+	if err != nil {
+		postLog.Error(fmt.Sprintf("[qq_onebot] Failed to connect to OneBot API WebSocket: %v", err))
+		return
+	}
+
+	c.apiMu.Lock()
+	c.apiConn = conn
+	close(c.apiChanged)
+	c.apiChanged = make(chan struct{})
+	c.apiMu.Unlock()
+
+	postLog.Info("[qq_onebot] Connected to OneBot API WebSocket")
+
+	c.readAPILoop(conn)
+
+	c.apiMu.Lock()
+	if c.apiConn == conn {
+		c.apiConn = nil
+	}
+	close(c.apiChanged)
+	c.apiChanged = make(chan struct{})
+	c.apiMu.Unlock()
+
+	conn.Close()
+	c.failPending(fmt.Errorf("onebot API WebSocket disconnected"))
+}
+
+// readAPILoop reads response frames from the API socket until the connection
+// drops or Stop is called. It is the only reader of that connection.
+func (c *Client) readAPILoop(conn *websocket.Conn) {
+	for {
+		select {
+		case <-c.stopCh:
+			return
+		default:
+		}
+
+		_, data, err := conn.ReadMessage()
+		if err != nil {
+			select {
+			case <-c.stopCh:
+				// Stopping: the read error is just the closed socket.
+			default:
+				postLog.Error(fmt.Sprintf("[qq_onebot] API WebSocket read error: %v", err))
+			}
+			return
+		}
+
+		c.dispatchAPI(data)
+	}
+}
+
+// dispatchAPI decodes one inbound frame on the API socket. A frame with no usable
+// echo is not an API response and is ignored (the event socket is the only place
+// events are expected); otherwise the pending channel registered for that echo
+// receives the envelope and is removed, both under apiMu.
+func (c *Client) dispatchAPI(raw []byte) {
+	var resp APIResponse
+	if err := json.Unmarshal(raw, &resp); err != nil {
+		postLog.Debug("[qq_onebot] Failed to parse OneBot API response: " + err.Error())
+		return
+	}
+
+	key, ok := echoKey(resp.Echo)
+	if !ok {
+		postLog.Debug("[qq_onebot] Ignoring non-response frame on OneBot API WebSocket: " + string(raw))
+		return
+	}
+
+	c.apiMu.Lock()
+	ch := c.pending[key]
+	delete(c.pending, key)
+	c.apiMu.Unlock()
+
+	if ch != nil {
+		ch <- apiResult{resp: &resp}
+	}
+}
+
+// echoKey normalizes an echo value to its pending-map key. An absent or null echo
+// yields ok=false, i.e. the frame is not an API response. A JSON string is
+// unquoted; any other type falls back to its verbatim bytes so an adapter that
+// returns the id unquoted still matches.
+func echoKey(raw json.RawMessage) (string, bool) {
+	if len(raw) == 0 || string(raw) == "null" {
+		return "", false
+	}
+	var s string
+	if err := json.Unmarshal(raw, &s); err == nil {
+		return s, true
+	}
+	return string(raw), true
+}
+
+// failPending delivers err to every call waiting on a response and clears the
+// table, so a dropped API socket unblocks its callers immediately. Called on
+// disconnect and by Stop; safe to call repeatedly.
+func (c *Client) failPending(err error) {
+	c.apiMu.Lock()
+	pending := c.pending
+	c.pending = make(map[string]chan apiResult)
+	c.apiMu.Unlock()
+
+	for _, ch := range pending {
+		// Buffered cap 1, and each entry is owned exactly once, so this never blocks.
+		ch <- apiResult{err: err}
+	}
+}
+
+// Stop closes both WebSocket connections and unblocks the event reconnect loop,
+// the API loop and every in-flight callAPI. It is idempotent and safe to call
+// even when Listen was never started.
+func (c *Client) Stop() {
+	c.stopOnce.Do(func() {
+		close(c.stopCh)
+
+		c.apiMu.Lock()
+		c.stopped = true
+		apiConn := c.apiConn
+		c.apiMu.Unlock()
+
+		c.connMu.Lock()
+		if c.conn != nil {
+			c.conn.Close()
+			c.conn = nil
+		}
+		c.connMu.Unlock()
+
+		if apiConn != nil {
+			apiConn.Close()
+		}
+
+		c.failPending(fmt.Errorf("onebot client stopped"))
+	})
+}

internal/controller/pipes/qq_onebot/onebot_test.go

@@ -0,0 +1,235 @@
+package qq_onebot
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+// fakeOneBot is a minimal OneBot 11 forward-WebSocket server. "/api" answers
+// every action call by echoing its echo with a fixed ok response; "/" accepts the
+// event socket and hands it to the test so events can be pushed on demand.
+type fakeOneBot struct {
+	upgrader websocket.Upgrader
+
+	server      *httptest.Server
+	apiRequests chan fakeAPIRequest
+	eventConns  chan *websocket.Conn
+}
+
+type fakeAPIRequest struct {
+	Action string          `json:"action"`
+	Params json.RawMessage `json:"params"`
+	Echo   json.RawMessage `json:"echo"`
+}
+
+func newFakeOneBot(t *testing.T) *fakeOneBot {
+	t.Helper()
+
+	f := &fakeOneBot{
+		apiRequests: make(chan fakeAPIRequest, 16),
+		eventConns:  make(chan *websocket.Conn, 16),
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/api", func(w http.ResponseWriter, r *http.Request) {
+		conn, err := f.upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			return
+		}
+		defer conn.Close()
+
+		for {
+			_, data, err := conn.ReadMessage()
+			if err != nil {
+				return
+			}
+			var req fakeAPIRequest
+			if err := json.Unmarshal(data, &req); err != nil {
+				continue
+			}
+			f.apiRequests <- req
+
+			resp, _ := json.Marshal(map[string]json.RawMessage{
+				"status":  json.RawMessage(`"ok"`),
+				"retcode": json.RawMessage(`0`),
+				"data":    json.RawMessage(`{"message_id":123}`),
+				"echo":    req.Echo,
+			})
+			if err := conn.WriteMessage(websocket.TextMessage, resp); err != nil {
+				return
+			}
+		}
+	})
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		conn, err := f.upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			return
+		}
+		f.eventConns <- conn
+
+		// Keep the event socket open until the client goes away.
+		for {
+			if _, _, err := conn.ReadMessage(); err != nil {
+				return
+			}
+		}
+	})
+
+	f.server = httptest.NewServer(mux)
+	t.Cleanup(f.server.Close)
+	return f
+}
+
+// client returns a Client pointed at this fake server with the proxy disabled.
+func (f *fakeOneBot) client(t *testing.T) *Client {
+	t.Helper()
+	u, err := url.Parse(f.server.URL)
+	if err != nil {
+		t.Fatalf("parse test server URL: %v", err)
+	}
+	return NewClient(u.Hostname(), u.Port(), "", false)
+}
+
+// eventConn waits for the event socket to be established and returns it.
+func (f *fakeOneBot) eventConn(t *testing.T) *websocket.Conn {
+	t.Helper()
+	select {
+	case conn := <-f.eventConns:
+		return conn
+	case <-time.After(3 * time.Second):
+		t.Fatal("event WebSocket never connected")
+		return nil
+	}
+}
+
+// TestSendMsgOverWebSocket checks an API call is issued over the "/api" socket
+// and its response is decoded.
+func TestSendMsgOverWebSocket(t *testing.T) {
+	f := newFakeOneBot(t)
+
+	c := f.client(t)
+	go c.Listen(func([]byte) {})
+	defer c.Stop()
+
+	resp, err := c.SendMsg("group", 12345, "hello", false, 0)
+	if err != nil {
+		t.Fatalf("SendMsg: %v", err)
+	}
+	if resp.Status != "ok" || resp.RetCode != 0 {
+		t.Fatalf("unexpected response: %+v", resp)
+	}
+
+	var data struct {
+		MessageID int64 `json:"message_id"`
+	}
+	if err := json.Unmarshal(resp.Data, &data); err != nil {
+		t.Fatalf("decode data: %v", err)
+	}
+	if data.MessageID != 123 {
+		t.Fatalf("message_id = %d, want 123", data.MessageID)
+	}
+
+	req := <-f.apiRequests
+	if req.Action != "send_group_msg" {
+		t.Fatalf("action = %q, want send_group_msg", req.Action)
+	}
+	var params map[string]any
+	if err := json.Unmarshal(req.Params, &params); err != nil {
+		t.Fatalf("decode params: %v", err)
+	}
+	if params["group_id"].(float64) != 12345 || params["message"].(string) != "hello" {
+		t.Fatalf("params = %v", params)
+	}
+	var echo string
+	if err := json.Unmarshal(req.Echo, &echo); err != nil {
+		t.Fatalf("echo is not a JSON string: %s", req.Echo)
+	}
+}
+
+// TestBodylessActionSendsEmptyParams checks actions without arguments still send
+// a params object (never null), which some adapters reject.
+func TestBodylessActionSendsEmptyParams(t *testing.T) {
+	f := newFakeOneBot(t)
+
+	c := f.client(t)
+	go c.Listen(func([]byte) {})
+	defer c.Stop()
+
+	if _, err := c.GetGroupList(); err != nil {
+		t.Fatalf("GetGroupList: %v", err)
+	}
+
+	req := <-f.apiRequests
+	if req.Action != "get_group_list" {
+		t.Fatalf("action = %q, want get_group_list", req.Action)
+	}
+	if string(req.Params) != "{}" {
+		t.Fatalf("params = %s, want {}", req.Params)
+	}
+}
+
+// TestSendMsgFromEventCallbackDoesNotDeadlock is the regression test for the
+// reason the client uses two sockets: the event handler replies with SendMsg from
+// inside the event read loop, so a response read on that same connection would
+// never arrive.
+func TestSendMsgFromEventCallbackDoesNotDeadlock(t *testing.T) {
+	f := newFakeOneBot(t)
+
+	c := f.client(t)
+
+	type result struct {
+		resp *APIResponse
+		err  error
+	}
+	done := make(chan result, 1)
+	go c.Listen(func(raw []byte) {
+		resp, err := c.SendMsg("group", 1, "pong", false, 0)
+		done <- result{resp, err}
+	})
+	defer c.Stop()
+
+	evConn := f.eventConn(t)
+	event := []byte(`{"post_type":"message","message_type":"group","group_id":1,"user_id":2,"raw_message":"/ping","self_id":9}`)
+	if err := evConn.WriteMessage(websocket.TextMessage, event); err != nil {
+		t.Fatalf("write event: %v", err)
+	}
+
+	select {
+	case r := <-done:
+		if r.err != nil {
+			t.Fatalf("SendMsg from event callback: %v", r.err)
+		}
+		if r.resp.Status != "ok" {
+			t.Fatalf("unexpected response: %+v", r.resp)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatal("deadlock: SendMsg did not return from within the event callback")
+	}
+}
+
+// TestEchoKey covers the response-matcher: an absent or null echo is not a
+// response, and both string and non-string echoes normalize to a key.
+func TestEchoKey(t *testing.T) {
+	cases := []struct {
+		in  string
+		key string
+		ok  bool
+	}{
+		{`"42"`, "42", true},
+		{`42`, "42", true},
+		{`null`, "", false},
+		{``, "", false},
+	}
+	for _, tc := range cases {
+		key, ok := echoKey(json.RawMessage(tc.in))
+		if key != tc.key || ok != tc.ok {
+			t.Errorf("echoKey(%q) = (%q, %v), want (%q, %v)", tc.in, key, ok, tc.key, tc.ok)
+		}
+	}
+}

internal/controller/pipes/qq_onebot/qq.go

@@ -1,4 +1,4 @@
-package qq_napcat
+package qq_onebot
 
 import (
 	"encoding/json"
@@ -12,7 +12,7 @@ import (
 	"nukumizu-backend/postLog"
 )
 
-// oneBotEvent mirrors a OneBot 11 event pushed over the NapCat WebSocket.
+// oneBotEvent mirrors a OneBot 11 event pushed over the OneBot WebSocket.
 // Only "message" events are handled; notice/request/meta_event are ignored.
 type oneBotEvent struct {
 	PostType    string          `json:"post_type"`    // Identifies "message", "notice", "request", or "meta_event"
@@ -29,45 +29,46 @@ type oneBotEvent struct {
 	SubType string `json:"sub_type"` // The subtype of the message, e.g., "normal", "anonymous", etc.
 }
 
-// QQController handles QQ Bot interactions by connecting directly to NapCat.
+// QQController handles QQ Bot interactions by connecting directly to OneBot.
 type QQController struct {
-	cfg          config.QQConfig
+	cfg          config.OneBotConfig
-	napcatClient *Client
+	onebotClient *Client
 }
 
-// NewQQController creates a new QQ (Napcat) controller.
+// NewQQController creates a new QQ (OneBot) controller.
-func NewQQController(cfg config.QQConfig) *QQController {
+func NewQQController(cfg config.OneBotConfig) *QQController {
 	q := &QQController{cfg: cfg}
 	if cfg.Enabled {
-		q.napcatClient = NewClient(cfg.NapcatAddr, cfg.NapcatPort, cfg.NapcatToken, cfg.NetworkUseProxy)
+		q.onebotClient = NewClient(cfg.OneBotAddr, cfg.OneBotPort, cfg.OneBotToken, cfg.NetworkUseProxy)
 	}
 	return q
 }
 
 // Name returns the controller name.
 func (q *QQController) Name() string {
-	return "qq(napcat)"
+	return "qq_onebot"
 }
 
-// Start initializes the QQ controller and starts the NapCat WebSocket listener.
+// Start initializes the QQ controller and starts the OneBot WebSocket listeners
+// (the event socket and the API socket the client manages internally).
 func (q *QQController) Start() error {
 	if !q.cfg.Enabled {
 		// postLog.Info("QQ (Napcat) controller is disabled")
 		return nil
 	}
-	if q.napcatClient == nil {
+	if q.onebotClient == nil {
-		postLog.Warning("QQ (Napcat) controller enabled but NapCat client is nil")
+		postLog.Warning("[qq_onebot] QQ (OneBot) controller enabled but OneBot client is nil")
 		return nil
 	}
 
-	postLog.Info("QQ (Napcat) controller started, connecting to NapCat WebSocket...")
+	postLog.Info("[qq_onebot] QQ (OneBot) controller started, connecting to OneBot WebSocket...")
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("Napcat WS listener panic recovered: %v", r))
+				postLog.Error("[qq_onebot] OneBot WS listener panic recovered: " + fmt.Sprintf("%v", r))
 			}
 		}()
-		q.napcatClient.Listen(q.handleNapcatEvent)
+		q.onebotClient.Listen(q.handleOneBotEvent)
 	}()
 
 	return nil
@@ -75,10 +76,10 @@ func (q *QQController) Start() error {
 
 // Stop shuts down the QQ controller and its WebSocket listener.
 func (q *QQController) Stop() {
-	if q.napcatClient != nil {
+	if q.onebotClient != nil {
-		q.napcatClient.Stop()
+		q.onebotClient.Stop()
 	}
-	postLog.Info("QQ (Napcat) controller stopped")
+	postLog.Info("[qq_onebot] QQ (OneBot) controller stopped")
 }
 
 // IsEnabled returns whether the controller is enabled.
@@ -92,33 +93,43 @@ func (q *QQController) IsMarkdown() bool {
 	return q.cfg.Markdown
 }
 
-// handleNapcatEvent processes a raw OneBot event received from the NapCat WebSocket.
+// handleOneBotEvent processes a raw OneBot event received from the OneBot WebSocket.
-func (q *QQController) handleNapcatEvent(raw []byte) {
+func (q *QQController) handleOneBotEvent(raw []byte) {
 	var ev oneBotEvent
 	if err := json.Unmarshal(raw, &ev); err != nil {
-		postLog.Debug("Failed to parse NapCat WS event: " + err.Error())
+		postLog.Debug("[qq_onebot] Failed to parse OneBot WS event: " + err.Error())
 		return
 	}
 
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowNapcatMsg {
+	// The configuration is read once per event: the debug guards below are
-		postLog.Debug("Napcat WS event received: " + string(raw))
+	// evaluated several times, and taking them all from one version keeps a
+	// concurrent reload from splitting them mid-event.
+	cfg := config.Current()
+	if cfg == nil {
+		return
+	}
+	debugMode := cfg.System.DebugMode
+	showAction := debugMode && cfg.Debug.ShowOneBotAction
+
+	if debugMode && cfg.Debug.ShowOneBotMsg {
+		postLog.Debug("[qq_onebot] OneBot WS event received: " + string(raw))
 	}
 
 	// Only handle message events; ignore notice/request/meta_event.
 	if ev.PostType != "message" {
-		if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowNapcatAction {
+		if showAction {
-			postLog.Debug("Ignoring Napcat WS event: " + string(raw))
+			postLog.Debug("[qq_onebot] Ignoring OneBot WS event: " + string(raw))
 		}
 		return
 	}
 
 	// Ignore messages the bot itself sent (echo prevention).
-	if q.isSelfMessage(ev) && !config.C_globalConfig.System.DebugMode {
+	if q.isSelfMessage(ev) && !debugMode {
 		return
 	}
-	if q.isSelfMessage(ev) && config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.NapcatIgnoreSelfMsg {
+	if q.isSelfMessage(ev) && debugMode && cfg.Debug.OneBotIgnoreSelfMsg {
-		if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowNapcatAction {
+		if showAction {
-			postLog.Debug("Ignoring Napcat WS self message: " + string(raw))
+			postLog.Debug("[qq_onebot] Ignoring OneBot WS self message: " + string(raw))
 		}
 		return
 	}
@@ -138,20 +149,20 @@ func (q *QQController) handleNapcatEvent(raw []byte) {
 
 	response := q.processCommand(cmd)
 	if response == "" {
-		if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowNapcatAction {
+		if showAction {
-			postLog.Debug("Napcat WS command discarded: " + string(raw))
+			postLog.Debug("[qq_onebot] OneBot WS command discarded: " + string(raw))
 		}
 		return
 	}
 
 	// Reply in the same chat.
 	if ev.MessageType == "private" {
-		if _, err := q.napcatClient.SendMsg("private", ev.UserID, response, false, 0); err != nil {
+		if _, err := q.onebotClient.SendMsg("private", ev.UserID, response, false, 0); err != nil {
-			postLog.Warning("Failed to send NapCat private reply: " + err.Error())
+			postLog.Warning("[qq_onebot] Failed to send OneBot private reply: " + err.Error())
 		}
 	} else {
-		if _, err := q.napcatClient.SendMsg("group", ev.GroupID, response, false, 0); err != nil {
+		if _, err := q.onebotClient.SendMsg("group", ev.GroupID, response, false, 0); err != nil {
-			postLog.Warning("Failed to send NapCat group reply: " + err.Error())
+			postLog.Warning("[qq_onebot] Failed to send OneBot group reply: " + err.Error())
 		}
 	}
 }
@@ -160,6 +171,7 @@ func (q *QQController) handleNapcatEvent(raw []byte) {
 // complete command to the unified processor. It returns the response text to
 // reply with; an empty response means the message was discarded.
 func (q *QQController) processCommand(cmd controller.Command) string {
+	cfg := config.Current()
 	text := cmd.RawText
 
 	// In "at" listen mode, require an @mention of the bot and strip it before
@@ -168,8 +180,8 @@ func (q *QQController) processCommand(cmd controller.Command) string {
 	if q.cfg.ListenMethod == "at" {
 		atMention := fmt.Sprintf("[CQ:at,qq=%d]", q.cfg.BotQQID)
 		if !strings.Contains(text, atMention) {
-			if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowNapcatAction {
+			if cfg != nil && cfg.System.DebugMode && cfg.Debug.ShowOneBotAction {
-				postLog.Debug("Napcat WS message ignored (no @mention): " + text)
+				postLog.Debug("[qq_onebot] OneBot WS message ignored (no @mention): " + text)
 			}
 			return "" // Not mentioned, ignore.
 		}
@@ -190,13 +202,14 @@ func (q *QQController) processCommand(cmd controller.Command) string {
 	// Hand the complete command to the unified processor, which checks group
 	// vs private, trusted groups, admin permissions, and executes it.
 	response, err := controller.GetManager().Trigger(parsed, q.trustedGroupIDs(), q.adminIDs(), q.cfg.ListenMethod)
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowTriggerCmdEcho {
+	if cfg != nil && cfg.System.DebugMode && cfg.Debug.ShowTriggerCmdEcho {
-		postLog.Debug(fmt.Sprintf("[qq_napcat] triggered command: \"/%s\" with args: \"%s\" from chatID: %d and senderID: %d", parsed.Command, strings.Join(parsed.Args, ", "), cmd.ChatID, cmd.SenderID))
+		postLog.Debug(fmt.Sprintf("[qq_onebot] triggered command: \"/%s\" with args: \"%s\" from chatID: %d and senderID: %d", parsed.Command, strings.Join(parsed.Args, ", "), cmd.ChatID, cmd.SenderID))
 	}
 	if err != nil {
-		postLog.Error("Napcat command processing failed: " + err.Error())
+		postLog.Error("[qq_onebot] OneBot command processing failed: " + err.Error())
 		return ""
 	}
+	// postLog.Debug("[qq_onebot] processCommand.resp: " + response)
 	return response
 }
 
@@ -213,7 +226,7 @@ func (q *QQController) isSelfMessage(ev oneBotEvent) bool {
 
 // adminIDs returns the QQ admin IDs from bot_user_config.json.
 func (q *QQController) adminIDs() []string {
-	if c := config.C_botUserConfig; c != nil {
+	if c := config.BotUsers(); c != nil {
 		return c.QQ.Admins.IDs()
 	}
 	return nil
@@ -221,7 +234,7 @@ func (q *QQController) adminIDs() []string {
 
 // trustedGroupIDs returns the QQ trusted group IDs from bot_user_config.json.
 func (q *QQController) trustedGroupIDs() []string {
-	if c := config.C_botUserConfig; c != nil {
+	if c := config.BotUsers(); c != nil {
 		return c.QQ.TrustedGroups.IDs()
 	}
 	return nil
@@ -237,7 +250,7 @@ func (q *QQController) SendMessage(message controller.Message) error {
 	}
 
 	// Only notify trusted groups and admins whose options allow this message type.
-	if uc := config.C_botUserConfig; uc != nil {
+	if uc := config.BotUsers(); uc != nil {
 		for groupID, opts := range uc.QQ.TrustedGroups {
 			if !controller.MemberReceives(opts, message.Type) {
 				continue
@@ -260,12 +273,12 @@ func (q *QQController) SendStatusChange(change node.StatusChange) error {
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromStatusChange(change)
 	message := template.Render(cfg.ControllerMessage.ServerStatusChanged, params, q.cfg.Markdown)
 
 	// Only notify trusted groups and admins whose event_status_notify is true.
-	if uc := config.C_botUserConfig; uc != nil {
+	if uc := config.BotUsers(); uc != nil {
 		for groupID, opts := range uc.QQ.TrustedGroups {
 			if !opts.EventStatusNotify {
 				continue
@@ -289,7 +302,7 @@ func (q *QQController) SendServerList(onlineServers, offlineServers string) erro
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	message := template.Render(cfg.ControllerMessage.ServerList, params, q.cfg.Markdown)
 
@@ -305,7 +318,7 @@ func (q *QQController) SendExecuteResult(serverName, serverUUID, command, result
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
 	message := template.Render(cfg.ControllerMessage.ServerExecuteResult, params, q.cfg.Markdown)
 
@@ -330,35 +343,35 @@ func (q *QQController) SendAlert(alert controller.Alert) error {
 }
 
 func (q *QQController) sendGroupMessage(groupID string, message string) {
-	if q.napcatClient == nil {
+	if q.onebotClient == nil {
-		postLog.Warning("Cannot send QQ group message: NapCat client not initialized")
+		postLog.Warning("[qq_onebot] Cannot send QQ group message: OneBot client not initialized")
 		return
 	}
 
 	var groupIDInt int64
 	if _, err := fmt.Sscanf(groupID, "%d", &groupIDInt); err != nil || groupIDInt == 0 {
-		postLog.Warning(fmt.Sprintf("Invalid QQ group ID: %s", groupID))
+		postLog.Warning("[qq_onebot] Invalid QQ group ID: " + groupID)
 		return
 	}
 
-	if _, err := q.napcatClient.SendMsg("group", groupIDInt, message, false, 0); err != nil {
+	if _, err := q.onebotClient.SendMsg("group", groupIDInt, message, false, 0); err != nil {
-		postLog.Warning(fmt.Sprintf("Failed to send QQ group message to %s: %v", groupID, err))
+		postLog.Warning("[qq_onebot] Failed to send QQ group message to " + groupID + ": " + err.Error())
 	}
 }
 
 func (q *QQController) sendPrivateMessage(userID string, message string) {
-	if q.napcatClient == nil {
+	if q.onebotClient == nil {
-		postLog.Warning("Cannot send QQ private message: NapCat client not initialized")
+		postLog.Warning("[qq_onebot] Cannot send QQ private message: OneBot client not initialized")
 		return
 	}
 
 	var userIDInt int64
 	if _, err := fmt.Sscanf(userID, "%d", &userIDInt); err != nil || userIDInt == 0 {
-		postLog.Warning(fmt.Sprintf("Invalid QQ user ID: %s", userID))
+		postLog.Warning("[qq_onebot] Invalid QQ user ID: " + userID)
 		return
 	}
 
-	if _, err := q.napcatClient.SendMsg("private", userIDInt, message, false, 0); err != nil {
+	if _, err := q.onebotClient.SendMsg("private", userIDInt, message, false, 0); err != nil {
-		postLog.Warning(fmt.Sprintf("Failed to send QQ private message to %s: %v", userID, err))
+		postLog.Warning("[qq_onebot] Failed to send QQ private message to " + userID + ": " + err.Error())
 	}
 }

internal/controller/pipes/telegram/telegram.go

@@ -148,7 +148,7 @@ func (t *TelegramController) handleUpdate(_ context.Context, _ *bot.Bot, update
 	}
 	msg := update.Message
 
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowTelegramMsg {
+	if cfg := config.Current(); cfg != nil && cfg.System.DebugMode && cfg.Debug.ShowTelegramMsg {
 		raw, _ := json.Marshal(update)
 		postLog.Debug("Telegram update received: " + string(raw))
 	}
@@ -232,7 +232,7 @@ func (t *TelegramController) processCommand(cmd controller.Command) string {
 	// Hand the complete command to the unified processor, which checks group
 	// vs private, trusted groups, admin permissions, and executes it.
 	response, err := controller.GetManager().Trigger(parsed, t.trustedGroupIDs(), t.resolvedAdminList(), t.cfg.ListenMethod)
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowTriggerCmdEcho {
+	if cfg := config.Current(); cfg != nil && cfg.System.DebugMode && cfg.Debug.ShowTriggerCmdEcho {
 		postLog.Debug(fmt.Sprintf("[telegram] triggered command: \"/%s\" with args: \"%s\" from chatID: %d and senderID: %d", parsed.Command, strings.Join(parsed.Args, ", "), cmd.ChatID, cmd.SenderID))
 	}
 	if err != nil {
@@ -252,7 +252,7 @@ func (t *TelegramController) SendMessage(message controller.Message) error {
 	}
 
 	// Only notify trusted groups and admins whose options allow this message type.
-	if uc := config.C_botUserConfig; uc != nil {
+	if uc := config.BotUsers(); uc != nil {
 		for groupID, opts := range uc.Telegram.TrustedGroups {
 			if !controller.MemberReceives(opts, message.Type) {
 				continue
@@ -275,12 +275,12 @@ func (t *TelegramController) SendStatusChange(change node.StatusChange) error {
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromStatusChange(change)
 	message := template.Render(cfg.ControllerMessage.ServerStatusChanged, params, t.cfg.Markdown)
 
 	// Only notify trusted groups and admins whose event_status_notify is true.
-	if uc := config.C_botUserConfig; uc != nil {
+	if uc := config.BotUsers(); uc != nil {
 		for groupID, opts := range uc.Telegram.TrustedGroups {
 			if !opts.EventStatusNotify {
 				continue
@@ -303,7 +303,7 @@ func (t *TelegramController) SendServerList(onlineServers, offlineServers string
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	message := template.Render(cfg.ControllerMessage.ServerList, params, t.cfg.Markdown)
 
@@ -317,7 +317,7 @@ func (t *TelegramController) SendExecuteResult(serverName, serverUUID, command,
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
 	message := template.Render(cfg.ControllerMessage.ServerExecuteResult, params, t.cfg.Markdown)
 
@@ -395,7 +395,7 @@ func (t *TelegramController) resolveUsername(username string) (int64, bool) {
 // adminIDs returns the Telegram admin entries (numeric user ID or @username)
 // from bot_user_config.json.
 func (t *TelegramController) adminIDs() []string {
-	if c := config.C_botUserConfig; c != nil {
+	if c := config.BotUsers(); c != nil {
 		return c.Telegram.Admins.IDs()
 	}
 	return nil
@@ -403,7 +403,7 @@ func (t *TelegramController) adminIDs() []string {
 
 // trustedGroupIDs returns the Telegram trusted group IDs from bot_user_config.json.
 func (t *TelegramController) trustedGroupIDs() []string {
-	if c := config.C_botUserConfig; c != nil {
+	if c := config.BotUsers(); c != nil {
 		return c.Telegram.TrustedGroups.IDs()
 	}
 	return nil

internal/controller/pipes/webhook.go

@@ -16,6 +16,11 @@ import (
 )
 
 // WebhookController handles notifications via generic HTTP webhooks.
+//
+// cfg and httpClient are written once, by the constructor, and never again: a
+// controller that needs different settings is replaced wholesale by the manager
+// rather than reconfigured in place, so the send methods can read them without
+// locking.
 type WebhookController struct {
 	cfg        config.WebhookConfig
 	httpClient *http.Client
@@ -66,7 +71,7 @@ func (w *WebhookController) SendStatusChange(change node.StatusChange) error {
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromStatusChange(change)
 	message := template.Render(cfg.ControllerMessage.ServerStatusChanged, params, w.cfg.Markdown)
 
@@ -87,7 +92,7 @@ func (w *WebhookController) SendServerList(onlineServers, offlineServers string)
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	message := template.Render(cfg.ControllerMessage.ServerList, params, w.cfg.Markdown)
 
@@ -108,7 +113,7 @@ func (w *WebhookController) SendExecuteResult(serverName, serverUUID, command, r
 		return nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
 	message := template.Render(cfg.ControllerMessage.ServerExecuteResult, params, w.cfg.Markdown)
 

internal/controller/processor.go

@@ -22,13 +22,13 @@ func commandMarkdown(cmd Command) bool {
 }
 
 func handleHelp(cmd Command) (string, error) {
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildBotInitializationMsgParams()
 	return template.Render(cfg.ControllerMessage.BotHelp, params, commandMarkdown(cmd)), nil
 }
 
 func handleList(cmd Command) (string, error) {
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromServerList()
 	return template.Render(cfg.ControllerMessage.ServerList, params, commandMarkdown(cmd)), nil
 }
@@ -139,7 +139,7 @@ func handleRun(cmd Command) (string, error) {
 		return fmt.Sprintf("Error getting results: %v", err), nil
 	}
 
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildParamsFromExecResult(uuidArg, uuidArg, command, formatTaskResults(results))
 	return template.Render(cfg.ControllerMessage.ServerExecuteResult, params, commandMarkdown(cmd)), nil
 }
@@ -189,7 +189,7 @@ func handleInfo(cmd Command) (string, error) {
 }
 
 func telegram_handleStart(cmd Command) (string, error) {
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	params := template.BuildBotInitializationMsgParams()
 	return template.Render(cfg.ControllerMessage.Tg_BotStart, params, commandMarkdown(cmd)), nil
 }

internal/controller/trigger.go

@@ -3,6 +3,8 @@ package controller
 import (
 	"fmt"
 	"strings"
+
+	"nukumizu-backend/postLog"
 )
 
 // Trigger validates an incoming command against the pipe's authorization
@@ -16,9 +18,11 @@ func (m *Manager) Trigger(cmd Command, trustedGroups, admins []string, listenMet
 	// Check whether the command arrived in a group or a private chat.
 	if cmd.ChatType == "group" {
 		// Group commands are only honored from trusted groups, otherwise discard.
+		// postLog.Debug(fmt.Sprintf("trustedGroups: %v", trustedGroups))
 		if !IsTrustedGroup(cmd.ChatID, trustedGroups) {
 			return "", nil
 		}
+		postLog.Debug("isTrustedGroup")
 	}
 
 	// Commands that require special permission must be sent by an admin.
@@ -37,6 +41,7 @@ func (m *Manager) Trigger(cmd Command, trustedGroups, admins []string, listenMet
 	if response == "" && listenMethod == "at" {
 		return "Unknown command: /" + cmd.Command, nil
 	}
+	// postLog.Debug("[controller] Trigger.resp: " + response)
 	return response, nil
 }
 

internal/komari/client.go

@@ -18,6 +18,14 @@ import (
 	"nukumizu-backend/postLog"
 )
 
+// taskEchoEnabled reports whether Komari task progress should be echoed to the
+// log: debug mode plus the showKomariTaskEcho toggle. The configuration is read
+// once per call so both flags come from the same reload.
+func taskEchoEnabled() bool {
+	cfg := config.Current()
+	return cfg != nil && cfg.System.DebugMode && cfg.Debug.ShowKomariTaskEcho
+}
+
 // NodeInfo represents a single node as returned by Komari's
 // common:getNodes RPC2 method.
 type NodeInfo struct {
@@ -146,7 +154,7 @@ func (c *Client) Login(username, password string) error {
 
 	var kr KomariResponse
 	if err := json.NewDecoder(resp.Body).Decode(&kr); err != nil {
-		if config.C_globalConfig.System.DebugMode {
+		if config.IsDebugMode() {
 			respBody, _ := io.ReadAll(resp.Body)
 			return fmt.Errorf("failed to parse komari login response: %w.\nResponse: %s", err, respBody)
 		}
@@ -240,7 +248,7 @@ func (c *Client) FetchNodes() ([]NodeInfo, error) {
 		postLog.Warning("Failed to save bot node config: " + err.Error())
 	}
 
-	postLog.Info(fmt.Sprintf("Fetched %d nodes from Komari", len(nodes)))
+	// postLog.Debug(fmt.Sprintf("Fetched %d nodes from Komari", len(nodes)))
 	return nodes, nil
 }
 
@@ -332,7 +340,7 @@ func (c *Client) ExecTask(uuids []string, command string) (string, error) {
 		return "", fmt.Errorf("failed to parse komari task exec data: %w", err)
 	}
 
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowKomariTaskEcho {
+	if taskEchoEnabled() {
 		postLog.Debug(fmt.Sprintf("Created Komari task %s for %d clients", result.TaskID, len(uuids)))
 	}
 	return result.TaskID, nil
@@ -375,7 +383,7 @@ func (c *Client) GetTaskResult(taskID string) ([]TaskResult, bool, error) {
 // PollTaskResult polls for task results every 1 second until all results are
 // available or 60 seconds have elapsed.
 func (c *Client) PollTaskResult(taskID string) ([]TaskResult, error) {
-	if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowKomariTaskEcho {
+	if taskEchoEnabled() {
 		postLog.Debug(fmt.Sprintf("Polling for Komari task %s results...", taskID))
 	}
 
@@ -393,7 +401,7 @@ func (c *Client) PollTaskResult(taskID string) ([]TaskResult, error) {
 				return nil, err
 			}
 			if done {
-				if config.C_globalConfig.System.DebugMode && config.C_globalConfig.Debug.ShowKomariTaskEcho {
+				if taskEchoEnabled() {
 					postLog.Info(fmt.Sprintf("Task %s completed with %d results", taskID, len(results)))
 				}
 				return results, nil

internal/komari/ws.go

@@ -409,7 +409,10 @@ func GetWSClient() *WSClient {
 
 // LoginAndStart performs the Komari login and returns an error if it fails.
 func LoginAndStart() error {
-	cfg := config.C_globalConfig
+	cfg := config.Current()
+	if cfg == nil {
+		return fmt.Errorf("configuration not loaded")
+	}
 	client := GetClient()
 	if client == nil {
 		return fmt.Errorf("komari client not initialized")

internal/netproxy/netproxy.go

@@ -2,6 +2,10 @@
 // network proxy configured in the system config. Each caller decides whether
 // to use the proxy by passing its own useProxy flag (the per-channel
 // networkUseProxy setting), so proxying is opt-in per channel.
+//
+// The opt-in is captured when a client is built, but the proxy address is not:
+// it is read again on every request and every dial, so editing
+// system.networkProxy takes effect on clients that already exist.
 package netproxy
 
 import (
@@ -20,7 +24,11 @@ import (
 // proxyURL returns the system-wide network proxy URL, or nil when none is
 // configured. A missing scheme is normalized to http:// for convenience.
 func proxyURL() *url.URL {
-	raw := config.C_globalConfig.System.NetworkProxy
+	cfg := config.Current()
+	if cfg == nil {
+		return nil
+	}
+	raw := cfg.System.NetworkProxy
 	if raw == "" {
 		return nil
 	}
@@ -35,19 +43,23 @@ func proxyURL() *url.URL {
 }
 
 // ProxyFunc returns a transport proxy function that routes requests through
-// the configured network proxy when enabled. It returns nil when the caller
+// the configured network proxy when enabled, and nil when the caller opts out
-// opts out or no proxy is configured, meaning direct connection. The returned
+// of proxying entirely. The returned function is compatible with both
-// function is compatible with both http.Transport.Proxy and
+// http.Transport.Proxy and websocket.Dialer.Proxy.
-// websocket.Dialer.Proxy.
+//
+// The proxy address is resolved on every call rather than once here, so a
+// settings update that changes system.networkProxy reaches a client that was
+// already built. That is also why opting out is the only case that returns nil:
+// a function resolved to nothing at construction time would pin its client to
+// whatever was configured then. A nil URL from the returned function means no
+// proxy is configured and the request goes direct.
 func ProxyFunc(useProxy bool) func(*http.Request) (*url.URL, error) {
 	if !useProxy {
 		return nil
 	}
-	u := proxyURL()
+	return func(*http.Request) (*url.URL, error) {
-	if u == nil {
+		return proxyURL(), nil
-		return nil
 	}
-	return http.ProxyURL(u)
 }
 
 // HTTPClient builds an http.Client that sends traffic through the configured
@@ -67,10 +79,16 @@ func HTTPClient(useProxy bool, timeout time.Duration) *http.Client {
 // through the configured HTTP CONNECT proxy when enabled. Its signature
 // matches net.DialTimeout so it can be plugged into gomail's NetDialTimeout
 // to send SMTP over the proxy.
+//
+// Like ProxyFunc it reads the proxy address per dial, so clearing or changing
+// system.networkProxy reaches a dialer that already exists.
 func DialWithTimeout(useProxy bool) func(network, addr string, timeout time.Duration) (net.Conn, error) {
-	u := proxyURL()
 	return func(network, addr string, timeout time.Duration) (net.Conn, error) {
-		if !useProxy || u == nil {
+		if !useProxy {
+			return net.DialTimeout(network, addr, timeout)
+		}
+		u := proxyURL()
+		if u == nil {
 			return net.DialTimeout(network, addr, timeout)
 		}
 		return dialViaProxy(u, addr, timeout)

internal/netproxy/netproxy_test.go

@@ -0,0 +1,133 @@
+package netproxy
+
+import (
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"nukumizu-backend/config"
+)
+
+// publishConfig writes a config.json and makes it the configuration in effect,
+// which is what a settings update does.
+func publishConfig(t *testing.T, body string) {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "config.json")
+	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
+		t.Fatalf("write temp config: %v", err)
+	}
+	if _, err := config.LoadGlobalConfig(path); err != nil {
+		t.Fatalf("LoadGlobalConfig: %v", err)
+	}
+}
+
+// resolve runs a proxy function and returns the URL it chose, or "" when it
+// chose a direct connection.
+func resolve(t *testing.T, proxy func(*http.Request) (*url.URL, error)) string {
+	t.Helper()
+	req, err := http.NewRequest(http.MethodGet, "https://example.com/", nil)
+	if err != nil {
+		t.Fatalf("NewRequest: %v", err)
+	}
+	u, err := proxy(req)
+	if err != nil {
+		t.Fatalf("proxy function: %v", err)
+	}
+	if u == nil {
+		return ""
+	}
+	return u.String()
+}
+
+// TestProxyFuncResolvesPerCall is the property that makes system.networkProxy
+// hot-reloadable: the function handed to a transport keeps reading the live
+// configuration instead of the address that was configured when it was built.
+func TestProxyFuncResolvesPerCall(t *testing.T) {
+	publishConfig(t, `{"system":{"networkProxy":"http://127.0.0.1:7890"}}`)
+
+	proxy := ProxyFunc(true)
+	if proxy == nil {
+		t.Fatal("ProxyFunc(true) returned nil, so the channel would never proxy")
+	}
+	if got := resolve(t, proxy); got != "http://127.0.0.1:7890" {
+		t.Errorf("first resolution = %q", got)
+	}
+
+	// The same function must follow a settings update.
+	publishConfig(t, `{"system":{"networkProxy":"http://127.0.0.1:8888"}}`)
+	if got := resolve(t, proxy); got != "http://127.0.0.1:8888" {
+		t.Errorf("after a settings update the same function resolved %q", got)
+	}
+
+	// Clearing the proxy falls back to a direct connection.
+	publishConfig(t, `{"system":{"networkProxy":""}}`)
+	if got := resolve(t, proxy); got != "" {
+		t.Errorf("a cleared proxy still resolved %q", got)
+	}
+}
+
+func TestProxyFuncOptOutReturnsNil(t *testing.T) {
+	publishConfig(t, `{"system":{"networkProxy":"http://127.0.0.1:7890"}}`)
+
+	// A channel with networkUseProxy off must not be handed a function at all,
+	// so its transport keeps the default direct dialing.
+	if ProxyFunc(false) != nil {
+		t.Error("ProxyFunc(false) must return nil")
+	}
+}
+
+func TestProxyFuncNormalizesMissingScheme(t *testing.T) {
+	publishConfig(t, `{"system":{"networkProxy":"127.0.0.1:7890"}}`)
+
+	if got := resolve(t, ProxyFunc(true)); got != "http://127.0.0.1:7890" {
+		t.Errorf("resolved %q, want the http:// prefix added", got)
+	}
+}
+
+func TestProxyFuncIgnoresUnusableProxy(t *testing.T) {
+	// A value that cannot be parsed must leave the client dialing directly
+	// rather than failing every request.
+	publishConfig(t, `{"system":{"networkProxy":"://missing-scheme"}}`)
+
+	if got := resolve(t, ProxyFunc(true)); got != "" {
+		t.Errorf("an unparseable proxy resolved %q, want a direct connection", got)
+	}
+}
+
+// TestDialWithTimeoutDialsDirectlyWithoutProxy covers the path a cleared
+// system.networkProxy takes: the dialer was built while a proxy was configured,
+// and must fall back to a direct dial once there is none.
+func TestDialWithTimeoutDialsDirectlyWithoutProxy(t *testing.T) {
+	publishConfig(t, `{"system":{"networkProxy":"http://127.0.0.1:7890"}}`)
+
+	dial := DialWithTimeout(true)
+	if dial == nil {
+		t.Fatal("DialWithTimeout(true) returned nil")
+	}
+
+	// No proxy is listening on that address, so a dial attempted now would
+	// fail; clearing the setting is what makes the direct path reachable.
+	publishConfig(t, `{"system":{"networkProxy":""}}`)
+
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("listen: %v", err)
+	}
+	defer ln.Close()
+	go func() {
+		conn, err := ln.Accept()
+		if err == nil {
+			conn.Close()
+		}
+	}()
+
+	conn, err := dial("tcp", ln.Addr().String(), 5*time.Second)
+	if err != nil {
+		t.Fatalf("dial through a cleared proxy: %v", err)
+	}
+	conn.Close()
+}

internal/node/tracker.go

@@ -107,6 +107,7 @@ type StatusChangeCallback func(change StatusChange)
 // All methods are thread-safe.
 type Tracker struct {
 	mu              sync.RWMutex
+	count 			int
 	nodes           map[string]*Node  // uuid → Node
 	uuidToName      map[string]string // uuid → name (from node list)
 	onlineSet       map[string]bool   // which uuids are currently online
@@ -161,6 +162,13 @@ func (t *Tracker) fireCallbacks(change StatusChange) {
 	}
 }
 
+// GetNodeCount returns the total number of nodes in the tracker.
+func (t *Tracker) GetNodeCount() int {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.count
+}
+
 // UpdateNodeList replaces the full node list and updates each node's name and
 // static Info metadata. entries maps UUID → node metadata from the Komari node
 // list.
@@ -175,6 +183,8 @@ func (t *Tracker) UpdateNodeList(entries map[string]NodeListEntry) {
 		t.knownUUIDs[uuid] = true
 	}
 
+	t.count = len(entries)
+
 	t.uuidToName = make(map[string]string, len(entries))
 	for uuid, entry := range entries {
 		t.uuidToName[uuid] = entry.Name

main.go

@@ -14,7 +14,7 @@ import (
 	"nukumizu-backend/global"
 	"nukumizu-backend/internal/controller"
 	"nukumizu-backend/internal/controller/pipes"
-	"nukumizu-backend/internal/controller/pipes/qq_napcat"
+	"nukumizu-backend/internal/controller/pipes/qq_onebot"
 	"nukumizu-backend/internal/controller/pipes/telegram"
 	"nukumizu-backend/internal/komari"
 	"nukumizu-backend/internal/node"
@@ -58,6 +58,27 @@ func main() {
 	postLog.SetDebugMode(cfg.System.DebugMode)
 	postLog.InitLogBroadcaster()
 
+	// A settings update replaces the configuration in memory; these hooks push
+	// the new values into the state that was derived from the old one. The
+	// logger's debug flag is process-wide rather than read at every log call,
+	// and each controller holds its own copy of its channel settings plus the
+	// clients built from them.
+	config.OnReload(func(updated *config.Config) {
+		postLog.SetDebugMode(updated.System.DebugMode)
+
+		mgr := controller.GetManager()
+		if mgr == nil || !mgr.NeedsRebuild(updated.ControllerMethod) {
+			return
+		}
+
+		// Controller settings changed. Each controller reads its settings into
+		// fields when it is built, and the OneBot and Telegram ones own
+		// connections that cannot be re-pointed, so the change is applied by
+		// replacing the whole set rather than reconfiguring it in place.
+		postLog.Info("Controller settings changed; rebuilding every channel")
+		mgr.ReplaceAll(buildControllers(updated), updated.ControllerMethod)
+	})
+
 	dbPath := cfg.DBPath
 
 	if err := postLog.InitLogsDatabase(fmt.Sprintf("%s/log.db", dbPath)); err != nil {
@@ -110,7 +131,7 @@ func main() {
 	initControllers()
 
 	// Send the bot initialization message to all enabled bot controllers
-	// (QQ_NapCat, Telegram), then the server list right after it once the
+	// (QQ_OneBot, Telegram), then the server list right after it once the
 	// initial status refresh has completed so the list reflects the real
 	// online/offline state.
 	if mgr := controller.GetManager(); mgr != nil {
@@ -199,83 +220,28 @@ func startWebhookServer(cfg *config.Config) {
 	}()
 }
 
-// initControllers initializes and starts all configured controllers.
+// buildControllers constructs one controller per channel from the given
+// configuration. The set is built fresh whenever controller settings change,
+// because a controller reads its settings once at construction and two of them
+// own connections that cannot be re-pointed.
+func buildControllers(cfg *config.Config) []controller.Controller {
+	return []controller.Controller{
+		qq_onebot.NewQQController(cfg.ControllerMethod.QQ_OneBot),
+		telegram.NewTelegramController(cfg.ControllerMethod.Telegram),
+		pipes.NewEmailController(cfg.ControllerMethod.Email),
+		pipes.NewNtfyController(cfg.ControllerMethod.Ntfy),
+		pipes.NewWebhookController(cfg.ControllerMethod.Webhook),
+	}
+}
+
+// initControllers installs the initial controller set.
 func initControllers() {
-	cfg := config.C_globalConfig
+	cfg := config.Current()
 	mgr := controller.GetManager()
-	if mgr == nil {
+	if mgr == nil || cfg == nil {
 		return
 	}
-
+	mgr.ReplaceAll(buildControllers(cfg), cfg.ControllerMethod)
-	// QQ (Napcat) controller.
-	qqCtrl := qq_napcat.NewQQController(cfg.ControllerMethod.QQ)
-	mgr.Register(qqCtrl)
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("QQ controller panic: %v", r))
-			}
-		}()
-		if err := qqCtrl.Start(); err != nil {
-			postLog.Error("Failed to start QQ controller: " + err.Error())
-		}
-	}()
-
-	// Telegram controller.
-	tgCtrl := telegram.NewTelegramController(cfg.ControllerMethod.Telegram)
-	mgr.Register(tgCtrl)
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("Telegram controller panic: %v", r))
-			}
-		}()
-		if err := tgCtrl.Start(); err != nil {
-			postLog.Error("Failed to start Telegram controller: " + err.Error())
-		}
-	}()
-
-	// Email controller (status-only).
-	emailCtrl := pipes.NewEmailController(cfg.ControllerMethod.Email)
-	mgr.Register(emailCtrl)
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("Email controller panic: %v", r))
-			}
-		}()
-		if err := emailCtrl.Start(); err != nil {
-			postLog.Error("Failed to start Email controller: " + err.Error())
-		}
-	}()
-
-	// Ntfy controller (status-only).
-	ntfyCtrl := pipes.NewNtfyController(cfg.ControllerMethod.Ntfy)
-	mgr.Register(ntfyCtrl)
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("Ntfy controller panic: %v", r))
-			}
-		}()
-		if err := ntfyCtrl.Start(); err != nil {
-			postLog.Error("Failed to start Ntfy controller: " + err.Error())
-		}
-	}()
-
-	// Webhook controller (status-only).
-	webhookCtrl := pipes.NewWebhookController(cfg.ControllerMethod.Webhook)
-	mgr.Register(webhookCtrl)
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				postLog.Error(fmt.Sprintf("Webhook controller panic: %v", r))
-			}
-		}()
-		if err := webhookCtrl.Start(); err != nil {
-			postLog.Error("Failed to start Webhook controller: " + err.Error())
-		}
-	}()
 }
 
 // startBackgroundTasks starts periodic background goroutines.
@@ -294,11 +260,15 @@ func startBackgroundTasks(_ *config.Config) {
 			if client == nil {
 				continue
 			}
+			orgNodeCount := node.GetTracker().GetNodeCount()
 			nodes, err := client.FetchNodes()
 			if err != nil {
 				postLog.Warning("Failed to refresh node list: " + err.Error())
 				continue
 			}
+			if node.GetTracker().GetNodeCount() != orgNodeCount {
+				postLog.Info(fmt.Sprintf("Refreshed node list: %d nodes", len(nodes)))
+			}
 			tracker := node.GetTracker()
 			if tracker != nil {
 				tracker.UpdateNodeList(komari.BuildNodeListData(nodes))

run.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+#
+# Runs the server from source, with the build metadata stamped in.
+#
+# The console is embedded in the binary (web/embed.go), so compiling without
+# web/dist fails. Say that plainly rather than leaving go:embed's error.
+set -euo pipefail
+
+# Run from the repository root, however the script was invoked.
+cd "$(dirname "$0")"
+
+if [ ! -f web/dist/index.html ]; then
+    echo "The web console is not built: web/dist is missing." >&2
+    echo "Run build-linux-x86_64.sh once, or \"npm run build\" in frontend/." >&2
+    exit 1
+fi
+
+# Get git commit hash (shortened to 7 characters, can also use full)
+COMMIT=$(git rev-parse --short HEAD)
+
+# Get UTC time
+BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+
+# Build -ldflags
+LDFLAGS="-X main.BuildTime=$BUILD_DATE -X main.CommitHash=$COMMIT"
+go run -ldflags "$LDFLAGS" .