如何編碼嵌套的Python Protobuf

Question

被絆倒了一段時間，把我剩下的頭發拉了出來。

將非嵌套的Protobuf從Python發送到Java，再從Java發送到Python，而WebSockets沒有問題。 我的問題是通過WebSocket發送嵌套版本。 我相信我的問題在Python編碼方面。

感謝您的指導。

.proto文件

message Response {
  // Reflect back to caller
  required string service_name = 1;

  // Reflect back to caller
  required string method_name = 2;

  // Who is responding
  required string client_id = 3;

  // Status Code
  required StatusCd status_cd = 4;

  // RPC response proto
  optional bytes response_proto = 5;

  // Was callback invoked
  optional bool callback = 6 [default = false];

  // Error, if any
  optional string error = 7;
  //optional string response_desc = 6;
}

message HeartbeatResult {
    required string service = 1;
    required string timestamp = 2;
    required float status_cd = 3;
    required string status_summary = 4;
}

心跳結果應該在Response Protobuf的reponse_proto字段中發送。 我可以在Java到Java中執行此操作，但Python到Java無法正常工作。

我已經包括了python代碼的兩個變體。 兩者都不起作用。

   def GetHeartbeat(self):
    print "GetHeartbeat called"
    import time
    ts = time.time()
    import datetime
    st = datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d %H:%M:%S')
    heartbeatResult = rpc_pb2.HeartbeatResult()
    heartbeatResult.service = "ALERT_SERVICE"
    heartbeatResult.timestamp = st
    heartbeatResult.status_cd = rpc_pb2.OK
    heartbeatResult.status_summary = "OK"

    response = rpc_pb2.Response()
    response.service_name = ""
    response.method_name = "SendHeartbeatResult"
    response.client_id = "ALERT_SERVICE"
    response.status_cd = rpc_pb2.OK 
    response.response_proto = str(heartbeatResult).encode('utf-8')

    self.sendMessage(response.SerializeToString())
    print "GetHeartbeat finished"

   def GetHeartbeat2(self):
    print "GetHeartbeat called"
    import time
    ts = time.time()
    import datetime
    st = datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d %H:%M:%S')
    heartbeatResult = rpc_pb2.HeartbeatResult()
    heartbeatResult.service = "ALERT_SERVICE"
    heartbeatResult.timestamp = st
    heartbeatResult.status_cd = rpc_pb2.OK
    heartbeatResult.status_summary = "OK"

    response = rpc_pb2.Response()
    response.service_name = ""
    response.method_name = "SendHeartbeatResult"
    response.client_id = "ALERT_SERVICE"
    response.status_cd = rpc_pb2.OK 
    response.response_proto = heartbeatResult.SerializeToString()
    self.sendMessage(response.SerializeToString())
    print "GetHeartbeat finished"

Java服務器端的錯誤是：

(GetHeartbeat) Protocol message end-group tag did not match expected tag
and
(GetHeartbeat2)
Message: [org.java_websocket.exceptions.InvalidDataException: java.nio.charset.MalformedInputException: Input length = 1
    at org.java_websocket.util.Charsetfunctions.stringUtf8(Charsetfunctions.java:80)
    at org.java_websocket.WebSocketImpl.deliverMessage(WebSocketImpl.java:561)
    at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:328)
    at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:149)
    at org.java_websocket.server.WebSocketServer$WebSocketWorker.run(WebSocketServer.java:593)
Caused by: java.nio.charset.MalformedInputException: Input length = 1
    at java.nio.charset.CoderResult.throwException(CoderResult.java:277)
    at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:798)
    at org.java_websocket.util.Charsetfunctions.stringUtf8(Charsetfunctions.java:77)

Answer 1

解

還在protobuf組上發布了這個問題

感謝Christopher Head和Ilia Mirkin在Google小組中提供的意見

https://groups.google.com/forum/#!topic/protobuf/Cp7zWiWok9I

response.response_proto = base64.b64encode(heartbeatResult.SerializeToString())
self.sendMessage(response.SerializeToString())

僅供參考，伊利亞（Ilia）還建議對整個消息進行base64編碼，但是目前看來這是可行的。