diff --git a/core/handler/server/log.go b/core/handler/server/log.go
index e1d1717..1c76964 100644
--- a/core/handler/server/log.go
+++ b/core/handler/server/log.go
@@ -16,10 +16,9 @@ package server
 
 import (
 	"context"
-	"encoding/json"
+	"io"
 	"net/http"
 	"strconv"
-	"time"
 
 	"github.com/99nil/gopkg/ctr"
 	"github.com/99nil/gopkg/sse"
@@ -105,52 +104,35 @@ func logWatch() http.HandlerFunc {
 			return
 		}
 
-		sender, err := sse.NewSender(w)
-		if err != nil {
-			wrapper.InternalError(w, err)
-			return
-		}
-		sender.Ping()
-
 		ctx, cancel := context.WithCancel(r.Context())
 		defer cancel()
 
 		ll := livelog.FromRequest(r)
 		lineCh, closeCh, err := ll.Watch(ctx, strconv.FormatUint(stepS.ID, 10))
 		if err != nil {
-			sender.SendError("", err)
+			wrapper.InternalError(w, err)
 			return
 		}
 		if closeCh == nil {
-			sender.Close()
+			wrapper.InternalError(w, "already closed")
 			return
 		}
 
-		pingChan := time.After(30 * time.Second)
-		timeoutChan := time.After(24 * time.Hour)
-	L:
-		for {
+		sender, err := sse.NewSender(w)
+		if err != nil {
+			wrapper.InternalError(w, err)
+			return
+		}
+
+		errCh := make(chan error)
+		go func() {
 			select {
 			case <-ctx.Done():
-				break L
+			case <-sender.WaitForClose():
 			case <-closeCh:
-				break L
-			case <-timeoutChan:
-				break L
-			case <-pingChan:
-				sender.Ping()
-			case line := <-lineCh:
-				data, err := json.Marshal(line)
-				if err != nil {
-					sender.SendError("", err)
-					continue
-				}
-				sender.SendMessage(&sse.Message{
-					Event: "data",
-					Data:  string(data),
-				})
+				errCh <- io.EOF
 			}
-		}
-		sender.Close()
+		}()
+		_ = sse.SendLoop[*livelog.Line](ctx, sender, lineCh, errCh)
 	}
 }
diff --git a/go.mod b/go.mod
index 157fb18..aed6b3a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/zc2638/ink
 go 1.21.0
 
 require (
-	github.com/99nil/gopkg v0.0.0-20240111070951-f7ccbb7471f3
+	github.com/99nil/gopkg v0.0.0-20240112073009-b6f03c6c05fc
 	github.com/docker/distribution v2.8.2+incompatible
 	github.com/docker/docker v24.0.5+incompatible
 	github.com/docker/go-units v0.5.0
diff --git a/go.sum b/go.sum
index d58bef4..ac63945 100644
--- a/go.sum
+++ b/go.sum
@@ -53,8 +53,8 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3fOKtUw0Xmo=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
-github.com/99nil/gopkg v0.0.0-20240111070951-f7ccbb7471f3 h1:/ov/x6XC6td/zd7vNVe4fmoqNF2zzEITzAsbUnIGyXA=
-github.com/99nil/gopkg v0.0.0-20240111070951-f7ccbb7471f3/go.mod h1:yQy7Xa2r1VHYfgqfCuDE6VGDmBt8xJgDVTZ2Bw3xTW0=
+github.com/99nil/gopkg v0.0.0-20240112073009-b6f03c6c05fc h1:BLGRvIONB+Q+hqwNfDzJE4iWTv2KX/1rufbEYBF/d08=
+github.com/99nil/gopkg v0.0.0-20240112073009-b6f03c6c05fc/go.mod h1:yQy7Xa2r1VHYfgqfCuDE6VGDmBt8xJgDVTZ2Bw3xTW0=
 github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8/go.mod h1:CzsSbkDixRphAF5hS6wbMKq0eI6ccJRb7/A0M6JBnwg=
 github.com/Azure/azure-pipeline-go v0.2.3/go.mod h1:x841ezTBIMG6O3lAcl8ATHnsOPVl2bqk7S3ta6S6u4k=
 github.com/Azure/azure-sdk-for-go v16.2.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
diff --git a/pkg/livelog/file.go b/pkg/livelog/file.go
index 7ef6e14..4f1a8a0 100644
--- a/pkg/livelog/file.go
+++ b/pkg/livelog/file.go
@@ -113,6 +113,7 @@ func NewFile(cfg ConfigFile) (Interface, error) {
 type file struct {
 	dir     string
 	rs      sync.Map
+	mux     sync.Mutex
 	clients map[string]map[*subscriber]struct{}
 }
 
@@ -137,7 +138,9 @@ func (f *file) List(ctx context.Context, id string) ([]*Line, error) {
 }
 
 func (f *file) Watch(ctx context.Context, id string) (<-chan *Line, <-chan struct{}, error) {
+	f.mux.Lock()
 	clients, ok := f.clients[id]
+	f.mux.Unlock()
 	if !ok {
 		return nil, nil, nil
 	}
@@ -178,11 +181,13 @@ func (f *file) Write(ctx context.Context, id string, line *Line) error {
 		return fmt.Errorf("log line write failed: %v", err)
 	}
 
+	f.mux.Lock()
 	clients, ok := f.clients[id]
 	if !ok {
 		f.clients[id] = make(map[*subscriber]struct{})
-		return nil
 	}
+	f.mux.Unlock()
+
 	for client := range clients {
 		client.publish(line)
 	}
@@ -199,13 +204,22 @@ func (f *file) Create(_ context.Context, id string) error {
 	if err != nil {
 		return err
 	}
+
 	fi := &fileItem{file: ff}
 	f.rs.Store(id, fi)
+
+	f.mux.Lock()
+	if _, ok := f.clients[id]; !ok {
+		f.clients[id] = make(map[*subscriber]struct{})
+	}
+	f.mux.Unlock()
 	return nil
 }
 
 func (f *file) Delete(_ context.Context, id string) error {
+	f.mux.Lock()
 	clients, ok := f.clients[id]
+	f.mux.Unlock()
 	if !ok {
 		return nil
 	}