Fix sock_connect() to resolve addresses for correct socket family

Fixes #139.

tests/test_sockets.py

@@ -116,6 +116,22 @@ async def run():
 
             self.loop.run_until_complete(run())
 
+    def test_socket_ipv4_nameaddr(self):
+        async def run():
+            sock = socket.socket(socket.AF_INET)
+            with sock:
+                sock.setblocking(False)
+                await self.loop.sock_connect(sock, ('localhost', 0))
+
+        with self.assertRaises(OSError):
+            # Regression test: sock_connect(sock) wasn't calling
+            # getaddrinfo() with `family=sock.family`, which resulted
+            # in `socket.connect()` being called with an IPv6 address
+            # for IPv4 sockets, which used to cause a TypeError.
+            # Here we expect that that is fixed so we should get an
+            # OSError instead.
+            self.loop.run_until_complete(run())
+
     def test_socket_blocking_error(self):
         self.loop.set_debug(True)
         sock = socket.socket()

uvloop/loop.pyx

@@ -2272,7 +2272,10 @@ cdef class Loop:
             if sock.family == uv.AF_UNIX:
                 fut = self._sock_connect(sock, address)
             else:
-                _, _, _, _, address = (await self.getaddrinfo(*address[:2]))[0]
+                addrs = await self.getaddrinfo(
+                    *address[:2], family=sock.family)
+
+                _, _, _, _, address = addrs[0]
                 fut = self._sock_connect(sock, address)
             if fut is not None:
                 await fut