add handler error metrics

pkg/handler/http/udp.go

@@ -2,17 +2,18 @@ package http
 
 import (
 	"context"
+	"errors"
 	"net"
 	"net/http"
 	"net/http/httputil"
 	"time"
 
+	"github.com/go-gost/gost/pkg/common/net/relay"
 	"github.com/go-gost/gost/pkg/common/util/socks"
-	"github.com/go-gost/gost/pkg/handler"
 	"github.com/go-gost/gost/pkg/logger"
 )
 
-func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) {
+func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
 	log = log.WithFields(map[string]any{
 		"cmd": "udp",
 	})
@@ -28,15 +29,15 @@ func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, network, add
 
 	if !h.md.enableUDP {
 		resp.StatusCode = http.StatusForbidden
-		resp.Write(conn)
 
 		if log.IsLevelEnabled(logger.DebugLevel) {
 			dump, _ := httputil.DumpResponse(resp, false)
 			log.Debug(string(dump))
 		}
-		log.Error("UDP relay is diabled")
 
-		return
+		log.Error("http: UDP relay is disabled")
+
+		return resp.Write(conn)
 	}
 
 	resp.StatusCode = http.StatusOK
@@ -46,24 +47,25 @@ func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, network, add
 	}
 	if err := resp.Write(conn); err != nil {
 		log.Error(err)
-		return
+		return err
 	}
 
 	// obtain a udp connection
 	c, err := h.router.Dial(ctx, "udp", "") // UDP association
 	if err != nil {
 		log.Error(err)
-		return
+		return err
 	}
 	defer c.Close()
 
 	pc, ok := c.(net.PacketConn)
 	if !ok {
-		log.Errorf("wrong connection type")
-		return
+		err = errors.New("wrong connection type")
+		log.Error(err)
+		return err
 	}
 
-	relay := handler.NewUDPRelay(socks.UDPTunServerConn(conn), pc).
+	relay := relay.NewUDPRelay(socks.UDPTunServerConn(conn), pc).
 		WithBypass(h.options.Bypass).
 		WithLogger(log)
 
@@ -73,4 +75,6 @@ func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, network, add
 	log.WithFields(map[string]any{
 		"duration": time.Since(t),
 	}).Infof("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
+
+	return nil
 }