feat 排队

internal/grpc_server/stream_client/scene.go

@@ -6,60 +6,79 @@ import (
 	"context"
 	"google.golang.org/grpc"
 	"google.golang.org/protobuf/proto"
+	"strconv"
+	"sync"
 )
 
-var sceneServerM map[int64]map[SceneFun]grpc.ClientStream // map[sid]map[方法名]流连接
-
 type SceneFun int
 
 const (
 	FunAction SceneFun = iota
 )
 
-func init() {
-	sceneServerM = make(map[int64]map[SceneFun]grpc.ClientStream)
+var sceneServer sync.Map // map[string]*sceneStream
+
+type sceneStream struct {
+	mu     sync.Mutex
+	stream grpc.ClientStream
 }
 
-func findSceneBySID(sid int64, fun SceneFun) (grpc.ClientStream, error) {
-	g := sceneServerM[sid]
-	if g == nil {
-		g = make(map[SceneFun]grpc.ClientStream)
-		sceneServerM[sid] = g
+func findSceneBySID(sid int64, fun SceneFun) (*sceneStream, error) {
+	key := sceneKey(sid, fun)
+
+	if v, ok := sceneServer.Load(key); ok {
+		return v.(*sceneStream), nil
 	}
-	sceneLink := g[fun]
-	if sceneLink == nil {
-		sceneClient, err := service.SceneNewClient(sid)
-		if err != nil {
-			log.Errorf("cannot find sceneClient: %v", err)
-			return nil, err
-		}
-		var link grpc.ClientStream
-		switch fun {
-		case FunAction:
-			link, err = sceneClient.Action(context.Background())
-		}
-		if err != nil {
-			log.Errorf("findSceneBySID %v err: %v, sid: %v", fun, err, sid)
-			return nil, err
-		}
-		g[fun] = link
-		sceneLink = link
+
+	client, err := service.SceneNewClient(sid)
+	if err != nil {
+		log.Errorf("findSceneBySID cannot find client: %v", err)
+		return nil, err
 	}
-	return sceneLink, nil
+	var stream grpc.ClientStream
+	switch fun {
+	case FunAction:
+		stream, err = client.Action(context.Background())
+	}
+	if err != nil {
+		log.Errorf("findSceneBySID %v err: %v, sid: %v", fun, err, sid)
+		return nil, err
+	}
+
+	ss := &sceneStream{stream: stream}
+	if actual, loaded := sceneServer.LoadOrStore(key, ss); loaded {
+		go func() { _ = stream.CloseSend() }()
+		return actual.(*sceneStream), nil
+	}
+
+	return ss, nil
 }
 
 func SendMessageToScene(sid int64, fun SceneFun, msg proto.Message, re ...bool) error {
-	stream, err := findSceneBySID(sid, fun)
+	ss, err := findSceneBySID(sid, fun)
 	if err != nil {
 		return err
 	}
-	if err = stream.SendMsg(msg); err != nil {
+
+	ss.mu.Lock()
+	err = ss.stream.SendMsg(msg)
+	ss.mu.Unlock()
+
+	if err != nil {
+		key := sceneKey(sid, fun)
+		if v, ok := sceneServer.Load(key); ok && v == ss {
+			sceneServer.Delete(key)
+			_ = ss.stream.CloseSend()
+		}
+		// 如果没有标识本次是重试的，就重试一次（默认重试）
 		if re == nil || !re[0] {
-			_ = stream.CloseSend()
-			delete(sceneServerM[sid], fun)
 			return SendMessageToScene(sid, fun, msg, true)
 		}
 		return err
 	}
 	return nil
 }
+
+func sceneKey(sid int64, fun SceneFun) string {
+	return strconv.FormatInt(sid, 10) + "-" + strconv.Itoa(int(fun))
+}