fix sync.once bug

必须使用引用，如果单纯值传递，once 也被复制了一份，导致单例不起作用。

pkg/server/api.go

@@ -14,10 +14,10 @@ import (
 
 // listServices return all service informations
 func (gs *gocServer) listServices(c *gin.Context) {
-	agents := make([]gocCoveredAgent, 0)
+	agents := make([]*gocCoveredAgent, 0)
 
 	gs.rpcClients.Range(func(key, value interface{}) bool {
-		agent, ok := value.(gocCoveredAgent)
+		agent, ok := value.(*gocCoveredAgent)
 		if !ok {
 			return false
 		}
@@ -40,7 +40,7 @@ func (gs *gocServer) getProfiles(c *gin.Context) {
 	mergedProfiles := make([][]*cover.Profile, 0)
 
 	gs.rpcClients.Range(func(key, value interface{}) bool {
-		agent, ok := value.(gocCoveredAgent)
+		agent, ok := value.(*gocCoveredAgent)
 		if !ok {
 			return false
 		}
@@ -80,7 +80,6 @@ func (gs *gocServer) getProfiles(c *gin.Context) {
 					})
 				}
 			}
-
 			// append profile
 			profile, err := convertProfile([]byte(res))
 			if err != nil {

pkg/server/rpcstream.go

@@ -41,7 +41,7 @@ func (gs *gocServer) serveRpcStream(c *gin.Context) {
 		return
 	}
 
-	gocA := gocCoveredAgent{
+	gocA := &gocCoveredAgent{
 		RemoteIP: remoteIP.String(),
 		Hostname: hostname,
 		Pid:      pid,
@@ -104,9 +104,7 @@ func (gs *gocServer) serveRpcStream(c *gin.Context) {
 	gocA.Id = string(clientId)
 	gs.rpcClients.Store(clientId, gocA)
 	// wait for exit
-	for {
-		<-gocA.exitCh
-	}
+	<-gocA.exitCh
 }
 
 func (gs *gocServer) wsping(ws *websocket.Conn, deadline time.Duration) error {