backend/main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"
)

func main() {
	configPath := flag.String("config", "./config.json", "path to config file")
	dbPath := flag.String("db", "./database.db", "path to database file")
	flag.Parse()

	if _, err := os.Stat(*configPath); os.IsNotExist(err) {
		defaultConfig := `{
	listenAddr": "	"0.0.0.0",
	"listenPort": "8080",
	"configDir": "./configs"
}`
		if err := os.WriteFile(*configPath, []byte(defaultConfig), 0644); err != nil {
			log.Fatalf("failed to create default config file: %v", err)
		}
		log.Printf("created default config file at %s", *configPath)
	}

	_, err := LoadConfig(*configPath)
	if err != nil {
		log.Fatalf("failed to load config: %v", err)
	}

	if err := InitDatabase(*dbPath); err != nil {
		log.Fatalf("failed to initialize database: %v", err)
	}
	log.Println("database initialized successfully")

	if err := InitFrpcDatabase(*dbPath); err != nil {
		log.Printf("warning: failed to initialize frpc database: %v", err)
	}

	config, err := GetConfig()
	if err != nil {
		log.Fatalf("failed to get config: %v", err)
	}

	setupRoutes()

	addr := fmt.Sprintf("%s:%s", config.ListenAddr, config.ListenPort)
	server := &http.Server{
		Addr:         addr,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	go func() {
		log.Printf("server starting on %s", addr)
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("failed to start server: %v", err)
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	log.Println("shutting down server...")

	if err := server.Close(); err != nil {
		log.Printf("server closed with error: %v", err)
	}

	if err := CloseDatabase(); err != nil {
		log.Printf("error closing database: %v", err)
	}

	if err := CloseFrpcDatabase(); err != nil {
		log.Printf("error closing frpc database: %v", err)
	}

	log.Println("server stopped")
}

func setupRoutes() {
	http.HandleFunc("/register", RegisterHandler)
	http.HandleFunc("/login", LoginHandler)

	http.HandleFunc("/frpcAct/instanceMgr/create", CreateInstanceHandler)
	http.HandleFunc("/frpcAct/instanceMgr/list", ListInstancesHandler)

	http.HandleFunc("/frpcAct/instanceMgr/", func(w http.ResponseWriter, r *http.Request) {
		path := r.URL.Path
		if len(path) < len("/frpcAct/instanceMgr/") {
			SendErrorResponse(w, http.StatusNotFound, "invalid path")
			return
		}

		remainingPath := path[len("/frpcAct/instanceMgr/"):]

		if r.Method == http.MethodPost {
			if remainingPath == "create" {
				CreateInstanceHandler(w, r)
				return
			}

			if remainingPath == "list" {
				ListInstancesHandler(w, r)
				return
			}

			if strings.HasSuffix(remainingPath, "/delete") {
				instanceName := strings.TrimSuffix(remainingPath, "/delete")
				instanceName = strings.Trim(instanceName, "/")
				DeleteInstanceHandler(w, r, instanceName)
				return
			}

			if strings.Contains(remainingPath, "/modify/") {
				parts := strings.SplitN(remainingPath, "/modify/", 2)
				if len(parts) == 2 {
					instanceName := strings.Trim(parts[0], "/")
					ModifyInstanceHandler(w, r, instanceName)
					return
				}
			}

			instanceName := strings.Trim(remainingPath, "/")
			if instanceName != "" {
				ListInstancesHandler(w, r)
				return
			}
		}

		SendErrorResponse(w, http.StatusNotFound, "endpoint not found")
	})
}