我需要在我的python - tornado服务器上接收协议缓冲区消息,并从二进制消息中获取内容。
postContent = self.request.body
message = prototemp.ReqMessage()
message.ParseFromString(postContent)
使用测试工具完美运行。当我在沙箱环境中运行它并模拟来自我的客户端的1000个请求时,它在某些情况下有效,但在大多数请求中,它会引发异常 -
File "server1.py", line 21, in post
message.ParseFromString(postContent)
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/message.py", line 179, in ParseFromString
self.MergeFromString(serialized)
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/internal/python_message.py", line 755, in MergeFromString
if self._InternalParse(serialized, 0, length) != length:
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/internal/python_message.py", line 782, in InternalParse
pos = field_decoder(buffer, new_pos, end, self, field_dict)
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/internal/decoder.py", line 544, in DecodeField
if value._InternalParse(buffer, pos, new_pos) != new_pos:
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/internal/python_message.py", line 782, in InternalParse
pos = field_decoder(buffer, new_pos, end, self, field_dict)
File "/usr/lib/python2.6/site-packages/protobuf-2.4.1-py2.6.egg/google/protobuf/internal/decoder.py", line 410, in DecodeField
field_dict[key] = local_unicode(buffer[pos:new_pos], 'utf-8')
UnicodeDecodeError: 'utf8' codec can't decode byte 0xce in position 1: invalid continuation byte
在其他一些情况下,它会出现这些错误 -
UnicodeDecodeError: 'utf8' codec can't decode byte 0xbf in position 3: invalid start byte
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe7 in position 3: unexpected end of data
可能是什么原因?
答案 0 :(得分:4)
我与RabbitMQ和Protocol Buffers完全相同。问题是协议缓冲区假定输入是str类型,而RabbitMQ似乎在某些情况下将消息解码为unicode(如果字节数组包含大于127的字节)。龙卷风也可能发生同样的情况。到目前为止,似乎可以通过以下代码来解决问题:
body = self.request.body
if type(body) == unicode:
data = bytearray(body, "utf-8")
body = bytes(data)
message = whatever.FromString(body)
此代码将unicode字符串转换为python bytes对象,可以通过协议缓冲区消息快速解析。 Dunno如果有更好的方法可以做到这一点,但至少这似乎有效。
答案 1 :(得分:1)
我遇到同样的问题。
这是一个参考文献[1]。
在这种情况下,我们应该使用字节。
感谢。
[1] https://developers.google.com/protocol-buffers/docs/proto#scalar