gh-90980: skip getaddrinfo thread if host is already resolved, using socket.AI_NUMERIC...

Lib/asyncio/base_events.py

@@ -99,65 +99,6 @@ def _set_reuseport(sock):
                              'SO_REUSEPORT defined but not implemented.')
 
 
-def _ipaddr_info(host, port, family, type, proto, flowinfo=0, scopeid=0):
-    # Try to skip getaddrinfo if "host" is already an IP. Users might have
-    # handled name resolution in their own code and pass in resolved IPs.
-    if not hasattr(socket, 'inet_pton'):
-        return
-
-    if proto not in {0, socket.IPPROTO_TCP, socket.IPPROTO_UDP} or \
-            host is None:
-        return None
-
-    if type == socket.SOCK_STREAM:
-        proto = socket.IPPROTO_TCP
-    elif type == socket.SOCK_DGRAM:
-        proto = socket.IPPROTO_UDP
-    else:
-        return None
-
-    if port is None:
-        port = 0
-    elif isinstance(port, bytes) and port == b'':
-        port = 0
-    elif isinstance(port, str) and port == '':
-        port = 0
-    else:
-        # If port's a service name like "http", don't skip getaddrinfo.
-        try:
-            port = int(port)
-        except (TypeError, ValueError):
-            return None
-
-    if family == socket.AF_UNSPEC:
-        afs = [socket.AF_INET]
-        if _HAS_IPv6:
-            afs.append(socket.AF_INET6)
-    else:
-        afs = [family]
-
-    if isinstance(host, bytes):
-        host = host.decode('idna')
-    if '%' in host:
-        # Linux's inet_pton doesn't accept an IPv6 zone index after host,
-        # like '::1%lo0'.
-        return None
-
-    for af in afs:
-        try:
-            socket.inet_pton(af, host)
-            # The host has already been resolved.
-            if _HAS_IPv6 and af == socket.AF_INET6:
-                return af, type, proto, '', (host, port, flowinfo, scopeid)
-            else:
-                return af, type, proto, '', (host, port)
-        except OSError:
-            pass
-
-    # "host" is not an IP address.
-    return None
-
-
 def _interleave_addrinfos(addrinfos, first_address_family_count=1):
     """Interleave list of addrinfo tuples by family."""
     # Group addresses by family
@@ -938,6 +879,15 @@ async def getaddrinfo(self, host, port, *,
         else:
             getaddr_func = socket.getaddrinfo
 
+        try:
+            return getaddr_func(
+                host, port, family, type, proto,
+                flags | socket.AI_NUMERICHOST | socket.AI_NUMERICSERV,
+            )
+        except socket.gaierror as e:
+            if e.errno != socket.EAI_NONAME:
+                raise
+
         return await self.run_in_executor(
             None, getaddr_func, host, port, family, type, proto, flags)
 
@@ -1514,14 +1464,17 @@ async def create_datagram_endpoint(self, protocol_factory,
     async def _ensure_resolved(self, address, *,
                                family=0, type=socket.SOCK_STREAM,
                                proto=0, flags=0, loop):
-        host, port = address[:2]
-        info = _ipaddr_info(host, port, family, type, proto, *address[2:])
-        if info is not None:
-            # "host" is already a resolved IP.
-            return [info]
-        else:
-            return await loop.getaddrinfo(host, port, family=family, type=type,
-                                          proto=proto, flags=flags)
+        host, port, *rest = address
+        if not rest:
+            return await loop.getaddrinfo(
+                host, port, family=family, type=type, proto=proto, flags=flags,
+            )
+        return [
+            (*first, (host, port, *rest)) for *first, (host, port, *_) in
+            await loop.getaddrinfo(
+                host, port, family=family, type=type, proto=proto, flags=flags,
+            )
+        ]
 
     async def _create_server_getaddrinfo(self, host, port, family, flags):
         infos = await self._ensure_resolved((host, port), family=family,

Lib/test/test_asyncio/test_base_events.py

@@ -36,7 +36,8 @@ def mock_socket_module():
     m_socket = mock.MagicMock(spec=socket)
     for name in (
         'AF_INET', 'AF_INET6', 'AF_UNSPEC', 'IPPROTO_TCP', 'IPPROTO_UDP',
-        'SOCK_STREAM', 'SOCK_DGRAM', 'SOL_SOCKET', 'SO_REUSEADDR', 'inet_pton'
+        'SOCK_STREAM', 'SOCK_DGRAM', 'SOL_SOCKET', 'SO_REUSEADDR', 'inet_pton',
+        'gaierror', 'AI_NUMERICHOST', 'AI_NUMERICSERV', 'EAI_NONAME',
     ):
         if hasattr(socket, name):
             setattr(m_socket, name, getattr(socket, name))
@@ -2059,31 +2060,6 @@ def test_create_datagram_endpoint_nosoreuseport(self, m_socket):
 
         self.assertRaises(ValueError, self.loop.run_until_complete, coro)
 
-    @patch_socket
-    def test_create_datagram_endpoint_ip_addr(self, m_socket):
-        def getaddrinfo(*args, **kw):
-            self.fail('should not have called getaddrinfo')
-
-        m_socket.getaddrinfo = getaddrinfo
-        m_socket.socket.return_value.bind = bind = mock.Mock()
-        self.loop._add_reader = mock.Mock()
-
-        reuseport_supported = hasattr(socket, 'SO_REUSEPORT')
-        coro = self.loop.create_datagram_endpoint(
-            lambda: MyDatagramProto(loop=self.loop),
-            local_addr=('1.2.3.4', 0),
-            reuse_port=reuseport_supported)
-
-        t, p = self.loop.run_until_complete(coro)
-        try:
-            bind.assert_called_with(('1.2.3.4', 0))
-            m_socket.socket.assert_called_with(family=m_socket.AF_INET,
-                                               proto=m_socket.IPPROTO_UDP,
-                                               type=m_socket.SOCK_DGRAM)
-        finally:
-            t.close()
-            test_utils.run_briefly(self.loop)  # allow transport to close
-
     def test_accept_connection_retry(self):
         sock = mock.Mock()
         sock.accept.side_effect = BlockingIOError()

Lib/test/test_asyncio/test_selector_events.py

@@ -172,7 +172,9 @@ def test_sock_connect_resolve_using_socket_params(self, m_gai):
                 con = self.loop.create_task(self.loop.sock_connect(sock, addr))
                 self.loop.run_until_complete(con)
                 m_gai.assert_called_with(
-                    addr[0], addr[1], sock.family, sock.type, sock.proto, 0)
+                    addr[0], addr[1], sock.family, sock.type, sock.proto,
+                    mock.ANY,
+                )
 
                 self.loop.run_until_complete(con)
                 sock.connect.assert_called_with(('127.0.0.1', 0))

Misc/NEWS.d/next/Library/2022-02-22-10-22-44.bpo-46824.IflDPF.rst

@@ -0,0 +1 @@
+skip getaddrinfo thread if host is already resolved, using socket.AI_NUMERIC