python - httpretty.enable() 之后 MongoClient 连接失败

Question

每当我启用 HTTPretty 时，我都无法与 PyMongo 建立连接。我知道 HTTPretty 改变了核心套接字模块；有什么办法解决这个问题吗？

代码示例:

    import pymongo
    import httpretty
    import time

    httpretty.enable()
    try:
        client = pymongo.MongoClient()
    except pymongo.errors.AutoReconnect:
        print("AutoReconnect")
        time.sleep(2)

引发异常:

    Traceback (most recent call last):
      File "C:\Python33\lib\site-packages\pymongo\mongo_client.py", line 363, in __init__
        self._ensure_connected(True)
      File "C:\Python33\lib\site-packages\pymongo\mongo_client.py", line 924, in _ensure_connected
        self.__ensure_member()
      File "C:\Python33\lib\site-packages\pymongo\mongo_client.py", line 797, in __ensure_member
        member, nodes = self.__find_node()
      File "C:\Python33\lib\site-packages\pymongo\mongo_client.py", line 888, in __find_node
        raise AutoReconnect(', '.join(errors))
    pymongo.errors.AutoReconnect: [WinError 10035] A non-blocking socket operation could not be completed immediately

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "tmp.py", line 7, in 
        client = pymongo.MongoClient()
      File "C:\Python33\lib\site-packages\pymongo\mongo_client.py", line 366, in __init__
        raise ConnectionFailure(str(e))
    pymongo.errors.ConnectionFailure: [WinError 10035] A non-blocking socket operation could not be completed immediately

我在 Windows 8.1 上使用 Python 3.3。

谁能解释一下这种行为以及如何解决它？谢谢!

Answer 1

看起来引发的异常与 HTTPretty 的猴子补丁有关每当我们对非 HTTP 请求调用 sendall 时，它都会在自己的套接字上调用 settimeout(0) (请参阅 real_sendall )。这将套接字置于非阻塞模式。套接字上的超时永远不会重置在 real_sendall 之后，因此对 recv 的后续调用会失败并显示 WSAEWOULDBLOCK(错误号 10035)。这可能是 HTTPretty 中的一个错误。

解决此问题的一种方法是在之后重置套接字上的超时real_sendall。这可以通过猴子修补fakesocket.socket来完成在 HTTPretty 中:

from httpretty.core import fakesock

class MySocket(fakesock.socket):
    def real_sendall(self, data, *args, **kw):
        super(MySocket, self).real_sendall(data, *args, **kw)
        # Restore non-zero timeout
        self.truesock.settimeout(self.timeout)

fakesock.socket = MySocket