优化节点到API节点连接管理

internal/rpc/services/service_node_stream.go

@@ -134,6 +134,12 @@ func (this *NodeService) NodeStream(server pb.NodeService_NodeStreamServer) erro
 	}
 	nodeLocker.Unlock()
 
+	defer func() {
+		nodeLocker.Lock()
+		delete(requestChanMap, nodeId)
+		nodeLocker.Unlock()
+	}()
+
 	// 发送请求
 	go func() {
 		for {