feat(watchdog): add exception handling and webhook integration

- Implement exception handling in TCP client to process error messages
- Add webhook functionality to send notifications for exceptions
- Introduce utility functions for string parsing
- Update config with webhook template

utils/handlers.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"strconv"
 	"time"
+	"strings"
 
 	"super-frpc/database"
 	"super-frpc/global"
@@ -128,3 +129,35 @@ func LogRequest(r *http.Request, userID int) {
 func IntToString(i int) string {
 	return strconv.Itoa(i)
 }
+
+func GetTextMiddle(text, left, right string) string {
+	start := 0
+	if left != "" {
+		idx := strings.Index(text, left)
+		if idx == -1 {
+			return ""
+		}
+		start = idx + len(left)
+	}
+
+	if right == "" {
+		if start > len(text) {
+			return ""
+		}
+		return text[start:]
+	}
+
+	endIdx := strings.Index(text[start:], right)
+	if endIdx == -1 {
+		return ""
+	}
+	return text[start : start+endIdx]
+}
+
+func GetCmdType(source string) string {
+	return GetTextMiddle(source, "[", "]")
+}
+
+func GetCmdParams(source string, param string) string {
+	return GetTextMiddle(source, "<"+param+">", "</"+param+">")
+}

watchdog/processor.go

@@ -0,0 +1,32 @@
+package watchdog
+
+import (
+	"fmt"
+	"strings"
+
+	"super-frpc/global"
+	"super-frpc/webhook"
+)
+
+func exceptionHandle(exceptionType string, serviceName string, errorMsg string) {
+	body := make(map[string]string)
+	for k, v := range global.CurrentConfig.Webhook.Body {
+		replaced := v
+		for strings.Contains(replaced, "{{ exceptionType }}") ||
+			strings.Contains(replaced, "{{ serviceName }}") ||
+			strings.Contains(replaced, "{{ exceptionMsg }}") {
+			replaced = strings.ReplaceAll(replaced, "{{ exceptionType }}", exceptionType)
+			replaced = strings.ReplaceAll(replaced, "{{ serviceName }}", serviceName)
+			replaced = strings.ReplaceAll(replaced, "{{ exceptionMsg }}", errorMsg)
+		}
+		body[k] = replaced
+	}
+
+	bodyJSON := ""
+	for k, v := range body {
+		bodyJSON = fmt.Sprintf(`{"%s": "%s"}`, k, v)
+		break
+	}
+
+	webhook.SendHook(global.CurrentConfig.Webhook.URL, global.CurrentConfig.Webhook.Method, global.CurrentConfig.Webhook.Headers, bodyJSON)
+}

watchdog/tcpClient.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"strings"
 	"super-frpc/postLog"
+	"super-frpc/utils"
 	"sync"
 	"time"
 )
@@ -108,15 +109,23 @@ func recvMsg() {
 
 			if len(data) > 0 {
 				line := strings.TrimSpace(string(data))
-
 				if len(line) > 0 {
 					select {
 					case recvChan <- line: 
 					default:
+						// drop the message
 					}
-
+					// Here add logic to handle the message
 					if !isResponseMessage(line) {
 						postLog.Debug(fmt.Sprintf("[Watchdog] TCP Socket received message: %s", line))
+						cmdType := utils.GetCmdType(line)
+						if cmdType == "Exception" {
+							exceptionType := utils.GetCmdParams(line, "exceptionType")
+							serviceName := utils.GetCmdParams(line, "serviceName")
+							errorMsg := utils.GetCmdParams(line, "errorMsg")
+							postLog.Error(fmt.Sprintf("[Watchdog] Exception[%s]: %s, %s", serviceName, exceptionType, errorMsg))
+							exceptionHandle(exceptionType, serviceName, errorMsg)
+						}
 					}
 				}
 			}

webhook/webhook.go

@@ -0,0 +1,39 @@
+package webhook
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"super-frpc/postLog"
+)
+
+// SendHook sends a webhook to the specified URL.
+// Returns the error message, status code, and response message.
+// If the status code is not 200, it logs the error and returns the status code and response message.
+// If the status code is 200, it returns an empty error message, status code, and response message.
+func SendHook(url string, method string, headers map[string]string, body string) (err string, code int, msg string) {
+	req, reqErr := http.NewRequest(method, url, strings.NewReader(body))
+	if reqErr != nil {
+		return reqErr.Error(), 500, ""
+	}
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	resp, doErr := http.DefaultClient.Do(req)
+	if doErr != nil {
+		return doErr.Error(), 500, ""
+	}
+	defer resp.Body.Close()
+	respMsg := ""
+	if resp.Body != nil {
+		respBody, _ := io.ReadAll(resp.Body)
+		respMsg = string(respBody)
+	}
+	if resp.StatusCode != http.StatusOK {
+		postLog.Debug(fmt.Sprintf("[SendHook] SendHook { %s, %s, %s, %s } failed, status code: %d, response: [%s]: %s", url, method, headers, body, resp.StatusCode, resp.Status, respMsg))
+		return fmt.Sprintf("unexpected status code: %d, response: [%s]: %s", resp.StatusCode, resp.Status, respMsg), resp.StatusCode, respMsg
+	}
+	return "", 200, ""
+}