httpretty.enable（）之后MongoClient连接失败

Question

每当启用HTTPretty时，我就无法与PyMongo建立连接。 我知道HTTPretty会更改核心套接字模块； 有没有办法解决？

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中使用Python 3.3。

谁能解释这种现象以及如何解决？ 谢谢！

Answer 1

看起来正在引发的异常与HTTPretty的猴子修补套接字有关，每当我们在非HTTP请求中调用sendall时，该套接字都会在其自己的套接字上调用settimeout(0) （请参阅real_sendall ）。 这会将套接字置于非阻塞模式。 在real_sendall之后，套接字上的超时永远不会重置，因此后续对recv调用会因WSAEWOULDBLOCK （errno 10035）而失败。 这可能是HTTPretty中的错误。

一种解决方法是在real_sendall之后重置套接字上的超时。 这可以通过在HTTPretty中猴子修补fakesocket.socket来完成：

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