diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0c555a1..efe18c8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,6 +35,9 @@ jobs:
         with:
           go-version: ${{ matrix.go }}
 
+      - name: Lint
+        run: golint 
+
       - name: Build Server
         run: go build -v code/server/main.go
 
diff --git a/build b/build
index 73a5e65..9563275 100755
--- a/build
+++ b/build
@@ -4,10 +4,10 @@ VERSION="0.5.0"
 HASH=`git log -n1 --pretty=format:%h`
 REVERSION=`git log --oneline|wc -l|tr -d ' '`
 BUILD_TIME=`date +'%Y-%m-%d %H:%M:%S'`
-LDFLAGS="-X 'main._GIT_HASH=$HASH'
--X 'main._GIT_REVERSION=$REVERSION'
--X 'main._BUILD_TIME=$BUILD_TIME'
--X 'main._VERSION=$VERSION'"
+LDFLAGS="-X 'main.gitHash=$HASH'
+-X 'main.gitReversion=$REVERSION'
+-X 'main.buildTime=$BUILD_TIME'
+-X 'main.version=$VERSION'"
 
 go run contrib/bindata/main.go -pkg shell -o code/client/tunnel/shell/assets.go \
    -prefix html/shell "$@" html/shell/...
diff --git a/build_all.go b/build_all.go
index 04c05a8..b880d61 100644
--- a/build_all.go
+++ b/build_all.go
@@ -95,10 +95,10 @@ func build(t target) {
 	err = copyFile("CHANGELOG.md", path.Join(buildDir, "CHANGELOG.md"))
 	runtime.Assert(err)
 
-	ldflags := "-X 'main._GIT_HASH=" + gitHash() + "' " +
-		"-X 'main._GIT_REVERSION=" + gitReversion() + "' " +
-		"-X 'main._BUILD_TIME=" + buildTime() + "' " +
-		"-X 'main._VERSION=" + version + "'"
+	ldflags := "-X 'main.gitHash=" + gitHash() + "' " +
+		"-X 'main.gitReversion=" + gitReversion() + "' " +
+		"-X 'main.buildTime=" + buildTime() + "' " +
+		"-X 'main.version=" + version + "'"
 
 	logging.Info("build server...")
 	cmd := exec.Command("go", "build", "-o", path.Join(buildDir, "np-svr"+t.ext),
diff --git a/code/client/dashboard/dashboard.go b/code/client/dashboard/dashboard.go
index f7e83e6..508c540 100644
--- a/code/client/dashboard/dashboard.go
+++ b/code/client/dashboard/dashboard.go
@@ -16,6 +16,7 @@ type Dashboard struct {
 	Version string
 }
 
+// New create dashboard object
 func New(cfg *global.Configure, pl *pool.Pool, mgr *tunnel.Mgr, version string) *Dashboard {
 	return &Dashboard{
 		cfg:     cfg,
@@ -25,6 +26,7 @@ func New(cfg *global.Configure, pl *pool.Pool, mgr *tunnel.Mgr, version string)
 	}
 }
 
+// ListenAndServe listen and serve http handler
 func (db *Dashboard) ListenAndServe(addr string, port uint16) error {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/api/info", db.Info)
diff --git a/code/client/dashboard/h_render.go b/code/client/dashboard/h_render.go
index ff83228..b2458ab 100644
--- a/code/client/dashboard/h_render.go
+++ b/code/client/dashboard/h_render.go
@@ -15,7 +15,7 @@ import (
 func (db *Dashboard) Render(w http.ResponseWriter, r *http.Request) {
 	dir := strings.TrimPrefix(r.URL.Path, "/")
 	if filepath.Ext(dir) == ".html" {
-		db.renderHtml(w, r, dir)
+		db.renderHTML(w, r, dir)
 		return
 	}
 	data, err := Asset(dir)
@@ -28,10 +28,10 @@ func (db *Dashboard) Render(w http.ResponseWriter, r *http.Request) {
 		io.Copy(w, bytes.NewReader(data))
 		return
 	}
-	db.renderHtml(w, r, "index.html")
+	db.renderHTML(w, r, "index.html")
 }
 
-func (db *Dashboard) renderHtml(w http.ResponseWriter, r *http.Request, name string) {
+func (db *Dashboard) renderHTML(w http.ResponseWriter, r *http.Request, name string) {
 	data, err := Asset(name)
 	if err != nil {
 		if os.IsNotExist(err) {
diff --git a/code/client/dashboard/h_tunnels.go b/code/client/dashboard/h_tunnels.go
index 1a70482..09dbb9e 100644
--- a/code/client/dashboard/h_tunnels.go
+++ b/code/client/dashboard/h_tunnels.go
@@ -6,6 +6,7 @@ import (
 	"net/http"
 )
 
+// Tunnels get tunnels list
 func (db *Dashboard) Tunnels(w http.ResponseWriter, r *http.Request) {
 	type link struct {
 		ID         string `json:"id"`
diff --git a/code/client/main.go b/code/client/main.go
index d80e310..cfd478c 100644
--- a/code/client/main.go
+++ b/code/client/main.go
@@ -23,17 +23,17 @@ import (
 )
 
 var (
-	_VERSION       string = "0.0.0"
-	_GIT_HASH      string
-	_GIT_REVERSION string
-	_BUILD_TIME    string
+	version      string = "0.0.0"
+	gitHash      string
+	gitReversion string
+	buildTime    string
 )
 
 func showVersion() {
 	fmt.Printf("version: v%s\ntime: %s\ncommit: %s.%s\n",
-		_VERSION,
-		_BUILD_TIME,
-		_GIT_HASH, _GIT_REVERSION)
+		version,
+		buildTime,
+		gitHash, gitReversion)
 	os.Exit(0)
 }
 
@@ -108,7 +108,7 @@ func (a *app) run() {
 	}
 
 	if a.cfg.DashboardEnabled {
-		db := dashboard.New(a.cfg, pl, mgr, _VERSION)
+		db := dashboard.New(a.cfg, pl, mgr, version)
 		runtime.Assert(db.ListenAndServe(a.cfg.DashboardListen, a.cfg.DashboardPort))
 	} else {
 		select {}
diff --git a/code/client/tunnel/mgr.go b/code/client/tunnel/mgr.go
index c460058..301b99a 100644
--- a/code/client/tunnel/mgr.go
+++ b/code/client/tunnel/mgr.go
@@ -2,6 +2,7 @@ package tunnel
 
 import "sync"
 
+// Link link interface
 type Link interface {
 	GetID() string
 	// GetBytes rx, tx
diff --git a/code/client/tunnel/reverse/tunnel.go b/code/client/tunnel/reverse/tunnel.go
index 9409526..944781b 100644
--- a/code/client/tunnel/reverse/tunnel.go
+++ b/code/client/tunnel/reverse/tunnel.go
@@ -29,67 +29,67 @@ func New(cfg global.Tunnel) *Tunnel {
 }
 
 // GetName get reverse tunnel name
-func (tunnel *Tunnel) GetName() string {
-	return tunnel.Name
+func (tn *Tunnel) GetName() string {
+	return tn.Name
 }
 
 // GetTypeName get reverse tunnel type name
-func (tunnel *Tunnel) GetTypeName() string {
+func (tn *Tunnel) GetTypeName() string {
 	return "reverse"
 }
 
 // GetTarget get target of this tunnel
-func (tunnel *Tunnel) GetTarget() string {
-	return tunnel.cfg.Target
+func (tn *Tunnel) GetTarget() string {
+	return tn.cfg.Target
 }
 
 // GetLinks get tunnel links
-func (t *Tunnel) GetLinks() []tunnel.Link {
-	ret := make([]tunnel.Link, 0, len(t.links))
-	t.RLock()
-	for _, link := range t.links {
+func (tn *Tunnel) GetLinks() []tunnel.Link {
+	ret := make([]tunnel.Link, 0, len(tn.links))
+	tn.RLock()
+	for _, link := range tn.links {
 		ret = append(ret, link)
 	}
-	t.RUnlock()
+	tn.RUnlock()
 	return ret
 }
 
 // GetRemote get remote target name
-func (t *Tunnel) GetRemote() string {
-	return t.cfg.Target
+func (tn *Tunnel) GetRemote() string {
+	return tn.cfg.Target
 }
 
 // GetPort get listen port
-func (t *Tunnel) GetPort() uint16 {
-	return t.cfg.LocalPort
+func (tn *Tunnel) GetPort() uint16 {
+	return tn.cfg.LocalPort
 }
 
 // Handle handle tunnel
-func (tunnel *Tunnel) Handle(pool *pool.Pool) {
-	if tunnel.cfg.Type == "tcp" {
-		tunnel.handleTcp(pool)
+func (tn *Tunnel) Handle(pool *pool.Pool) {
+	if tn.cfg.Type == "tcp" {
+		tn.handleTCP(pool)
 	} else {
 		// TODO
 		func() {}()
 	}
 }
 
-func (tunnel *Tunnel) handleTcp(pool *pool.Pool) {
+func (tn *Tunnel) handleTCP(pool *pool.Pool) {
 	defer func() {
 		if err := recover(); err != nil {
-			logging.Error("close tcp tunnel: %s, err=%v", tunnel.cfg.Name, err)
+			logging.Error("close tcp tunnel: %s, err=%v", tn.cfg.Name, err)
 		}
 	}()
 	l, err := net.ListenTCP("tcp", &net.TCPAddr{
-		IP:   net.ParseIP(tunnel.cfg.LocalAddr),
-		Port: int(tunnel.cfg.LocalPort),
+		IP:   net.ParseIP(tn.cfg.LocalAddr),
+		Port: int(tn.cfg.LocalPort),
 	})
 	runtime.Assert(err)
 	defer l.Close()
 	for {
 		conn, err := l.Accept()
 		if err != nil {
-			logging.Error("accept from %s tunnel, err=%v", tunnel.cfg.Name, err)
+			logging.Error("accept from %s tunnel, err=%v", tn.cfg.Name, err)
 			continue
 		}
 
@@ -106,17 +106,17 @@ func (tunnel *Tunnel) handleTcp(pool *pool.Pool) {
 			logging.Error("no connection available")
 			continue
 		}
-		link := NewLink(tunnel, id, tunnel.cfg.Target, conn, remote)
-		tunnel.Lock()
-		tunnel.links[id] = link
-		tunnel.Unlock()
-		remote.SendConnectReq(id, tunnel.cfg)
+		link := NewLink(tn, id, tn.cfg.Target, conn, remote)
+		tn.Lock()
+		tn.links[id] = link
+		tn.Unlock()
+		remote.SendConnectReq(id, tn.cfg)
 		link.Forward()
 	}
 }
 
-func (tunnel *Tunnel) remove(id string) {
-	tunnel.Lock()
-	delete(tunnel.links, id)
-	tunnel.Unlock()
+func (tn *Tunnel) remove(id string) {
+	tn.Lock()
+	delete(tn.links, id)
+	tn.Unlock()
 }
diff --git a/code/server/main.go b/code/server/main.go
index 6dc4e41..edc5ffe 100644
--- a/code/server/main.go
+++ b/code/server/main.go
@@ -17,17 +17,17 @@ import (
 )
 
 var (
-	_VERSION       string = "0.0.0"
-	_GIT_HASH      string
-	_GIT_REVERSION string
-	_BUILD_TIME    string
+	version      string = "0.0.0"
+	gitHash      string
+	gitReversion string
+	buildTime    string
 )
 
 func showVersion() {
 	fmt.Printf("version: v%s\ntime: %s\ncommit: %s.%s\n",
-		_VERSION,
-		_BUILD_TIME,
-		_GIT_HASH, _GIT_REVERSION)
+		version,
+		buildTime,
+		gitHash, gitReversion)
 	os.Exit(0)
 }