fix a error when the socket connect is not blocking

add a Decorator to checking the socket's blocking

socks.py

@@ -60,6 +60,7 @@
 from os import SEEK_CUR
 import os
 import sys
+import functools
 from collections import Callable
 from base64 import b64encode
 
@@ -79,6 +80,25 @@
 
 _orgsocket = _orig_socket = socket.socket
 
+
+def set_self_blocking(function):
+
+    @functools.wraps(function)
+    def wrapper(*args, **kwargs):
+        self = args[0]
+        try:
+            _is_blocking =  self.gettimeout()
+            if _is_blocking == 0:
+                self.setblocking(True)
+            return function(*args, **kwargs)
+        except Exception as e:
+            raise(e)
+        finally:
+            # set orgin blcoking
+            if _is_blocking == 0:
+                self.setblocking(False)
+    return wrapper
+
 class ProxyError(IOError):
     """
     socket_err contains original socket.error exception.
@@ -707,7 +727,7 @@ def _negotiate_HTTP(self, dest_addr, dest_port):
                            HTTP: _negotiate_HTTP
                          }
 
-
+    @set_self_blocking
     def connect(self, dest_pair):
         """
         Connects to the specified destination through a proxy.