使用json时出现UnboundLocalError 错误

eveson 发表于 2015-01-21 11:13

本帖最后由 eveson 于 2015-01-21 11:15 编辑

问题：
直接调用self.rpc({"jsonrpc": "2.0", "method": "test", "params": , "id": 1})就没有问题
如果换成变量self.rpc(recvstr)就会抛出异常
代码：def test(num):
str = {"FunId":1, "Stat":0, "param":num}
print(str)
return str

global recvstr
class MyServerProtocol(WebSocketServerProtocol):
def __init__(self):
   self.rpc = JsonRpc()
   self.rpc['test'] = test

def onConnect(self, request):
   print("Client connecting: {0}".format(request.peer))

def onOpen(self):
   print("WebSocket connection open.")

def onMessage(self, payload, isBinary):
   if isBinary:
      print("Binary message received: {0} bytes".format(len(payload)))
   else:
      recvstr = format(payload.decode('utf8'))
      print("Text message received:",recvstr)
      self.rpc(recvstr)
      #self.rpc({"jsonrpc": "2.0", "method": "test", "params": , "id": 1})
   ## echo back message verbatim
   self.sendMessage(payload, isBinary)

def onClose(self, wasClean, code, reason):
   print("WebSocket connection closed: {0}".format(reason))
错误：Text message received: {"method": "test", "params": , "id": 1, "jsonrpc": "2.0"}
Exception in callback WebSocketAdapterProtocol._consume.<locals>.process(<Future finished result=None>) at /usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py:94
handle: <Handle WebSocketAdapterProtocol._consume.<locals>.process(<Future finished result=None>) at /usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py:94>
Traceback (most recent call last):
File "/usr/local/lib/python3.4/asyncio/events.py", line 119, in _run
self._callback(*self._args)
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 98, in process
self._dataReceived(data)
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1328, in _dataReceived
self.consumeData()
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1344, in consumeData
while self.processData() and self.state != WebSocketProtocol.STATE_CLOSED:
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1503, in processData
return self.processDataHybi()
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1817, in processDataHybi
fr = self.onFrameEnd()
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 1947, in onFrameEnd
self._onMessageEnd()
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 154, in _onMessageEnd
res = self.onMessageEnd()
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/websocket/protocol.py", line 743, in onMessageEnd
self._onMessage(payload, self.message_is_binary)
File "/usr/local/lib/python3.4/site-packages/autobahn-0.9.5-py3.4.egg/autobahn/asyncio/websocket.py", line 160, in _onMessage
res = self.onMessage(payload, isBinary)
File "server.py", line 46, in onMessage
self.rpc(recvstr)
File "/usr/local/lib/python3.4/site-packages/jsonrpc2-0.4.1-py3.4.egg/jsonrpc2/__init__.py", line 206, in __call__
return resdata
UnboundLocalError: local variable 'resdata' referenced before assignment

eveson 发表于 2015-01-21 11:29

请高手给看下怎么回事，搞了一上午了，哎，python用的不熟啊

修杰_JIANG 发表于 2015-01-21 14:34

你测试的参数和运行是的参数 recvstr数据类型不是一样的
recvstr.__class___ 看下

eveson 发表于 2015-01-21 16:12

解决了。追到库jsonrpc的源码里面，找了个他自己使用的过程看了下，原来调用rpc之前必须json.loads一下。
C语言用惯了，什么事情，总想自己推理、实现，用python还是老老实实看api，看demo

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使用json时出现UnboundLocalError 错误