merge ss and ssu

pkg/handler/forward/local/handler.go

@@ -0,0 +1,113 @@
+package local
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/go-gost/gost/pkg/bypass"
+	"github.com/go-gost/gost/pkg/chain"
+	"github.com/go-gost/gost/pkg/handler"
+	"github.com/go-gost/gost/pkg/logger"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/go-gost/gost/pkg/registry"
+)
+
+func init() {
+	registry.RegisterHandler("forward", NewHandler)
+}
+
+type localForwardHandler struct {
+	group  *chain.NodeGroup
+	chain  *chain.Chain
+	bypass bypass.Bypass
+	logger logger.Logger
+	md     metadata
+}
+
+func NewHandler(opts ...handler.Option) handler.Handler {
+	options := &handler.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &localForwardHandler{
+		chain:  options.Chain,
+		bypass: options.Bypass,
+		logger: options.Logger,
+	}
+}
+
+func (h *localForwardHandler) Init(md md.Metadata) (err error) {
+	return h.parseMetadata(md)
+}
+
+// Forward implements handler.Forwarder.
+func (h *localForwardHandler) Forward(group *chain.NodeGroup) {
+	h.group = group
+}
+
+func (h *localForwardHandler) Handle(ctx context.Context, conn net.Conn) {
+	defer conn.Close()
+
+	start := time.Now()
+	h.logger = h.logger.WithFields(map[string]interface{}{
+		"remote": conn.RemoteAddr().String(),
+		"local":  conn.LocalAddr().String(),
+	})
+
+	h.logger.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
+	defer func() {
+		h.logger.WithFields(map[string]interface{}{
+			"duration": time.Since(start),
+		}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
+	}()
+
+	target := h.group.Next()
+	if target == nil {
+		h.logger.Error("no target available")
+		return
+	}
+
+	h.logger = h.logger.WithFields(map[string]interface{}{
+		"dst": target.Addr(),
+	})
+
+	h.logger.Infof("%s >> %s", conn.RemoteAddr(), target.Addr())
+
+	r := (&handler.Router{}).
+		WithChain(h.chain).
+		WithRetry(h.md.retryCount).
+		WithLogger(h.logger)
+
+	network := "tcp"
+	if _, ok := conn.(net.PacketConn); ok {
+		network = "udp"
+	}
+
+	cc, err := r.Dial(ctx, network, target.Addr())
+	if err != nil {
+		h.logger.Error(err)
+		// TODO: the router itself may be failed due to the failed node in the router,
+		// the dead marker may be a wrong operation.
+		target.Marker().Mark()
+		return
+	}
+	defer cc.Close()
+	target.Marker().Reset()
+
+	t := time.Now()
+	h.logger.Infof("%s <-> %s", conn.RemoteAddr(), target.Addr())
+	handler.Transport(conn, cc)
+	h.logger.
+		WithFields(map[string]interface{}{
+			"duration": time.Since(t),
+		}).
+		Infof("%s >-< %s", conn.RemoteAddr(), target.Addr())
+}
+
+func (h *localForwardHandler) parseMetadata(md md.Metadata) (err error) {
+	h.md.readTimeout = md.GetDuration(readTimeout)
+	h.md.retryCount = md.GetInt(retryCount)
+	return
+}

pkg/handler/forward/local/metadata.go

@@ -0,0 +1,15 @@
+package local
+
+import (
+	"time"
+)
+
+const (
+	readTimeout = "readTimeout"
+	retryCount  = "retry"
+)
+
+type metadata struct {
+	readTimeout time.Duration
+	retryCount  int
+}