feat: scaffold independent workbench service

cmd/workbench/main.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"git.118im.com/im_team/im_workbench/internal/app"
+	"git.118im.com/im_team/im_workbench/internal/config"
+)
+
+func main() {
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatalf("load config: %v", err)
+	}
+
+	server, err := app.New(cfg)
+	if err != nil {
+		log.Fatalf("init app: %v", err)
+	}
+	defer server.Close()
+
+	httpServer := &http.Server{
+		Addr:              cfg.Listen,
+		Handler:           server.Handler(),
+		ReadHeaderTimeout: 5 * time.Second,
+	}
+
+	errCh := make(chan error, 1)
+	go func() {
+		log.Printf("im_workbench listening on %s", cfg.Listen)
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			errCh <- err
+		}
+	}()
+
+	stopCh := make(chan os.Signal, 1)
+	signal.Notify(stopCh, syscall.SIGINT, syscall.SIGTERM)
+
+	select {
+	case err := <-errCh:
+		log.Fatalf("serve: %v", err)
+	case <-stopCh:
+		log.Printf("shutdown requested")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := httpServer.Shutdown(ctx); err != nil {
+		log.Printf("shutdown error: %v", err)
+	}
+}