refactoring

weed/pb/grpc_client_server.go

@@ -76,43 +76,33 @@ func GrpcDial(ctx context.Context, address string, opts ...grpc.DialOption) (*gr
 	return grpc.DialContext(ctx, address, options...)
 }
 
-func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
+func getOrCreateConnection(address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
 
 	grpcClientsLock.Lock()
+	defer grpcClientsLock.Unlock()
 
 	existingConnection, found := grpcClients[address]
 	if found {
-		grpcClientsLock.Unlock()
+		return existingConnection, nil
-		err := fn(existingConnection)
-		if err != nil {
-			grpcClientsLock.Lock()
-			// delete(grpcClients, address)
-			grpcClientsLock.Unlock()
-			// println("closing existing connection to", existingConnection.Target())
-			// existingConnection.Close()
-		}
-		return err
 	}
 
 	grpcConnection, err := GrpcDial(context.Background(), address, opts...)
 	if err != nil {
-		grpcClientsLock.Unlock()
+		return nil, fmt.Errorf("fail to dial %s: %v", address, err)
-		return fmt.Errorf("fail to dial %s: %v", address, err)
 	}
 
 	grpcClients[address] = grpcConnection
-	grpcClientsLock.Unlock()
 
-	err = fn(grpcConnection)
+	return grpcConnection, nil
+}
+
+func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
+
+	grpcConnection, err := getOrCreateConnection(address, opts...)
 	if err != nil {
-		grpcClientsLock.Lock()
+		return fmt.Errorf("getOrCreateConnection %s: %v", address, err)
-		// delete(grpcClients, address)
-		grpcClientsLock.Unlock()
-		// println("closing created new connection to", grpcConnection.Target())
-		// grpcConnection.Close()
 	}
-
+	return fn(grpcConnection)
-	return err
 }
 
 func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) {