python/aqmp: drop _bind_hack()

_bind_hack() was a quick fix to allow async QMP to call bind(2) prior to
calling listen(2) and accept(2). This wasn't sufficient to fully address
the race condition present in synchronous clients.

With the race condition in legacy.py fixed (see the previous commit),
there are no longer any users of _bind_hack(). Drop it.

Fixes: b0b662bb2b
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-11-jsnow@redhat.com
[Expanded commit message. --js]
Signed-off-by: John Snow <jsnow@redhat.com>

python/qemu/aqmp/legacy.py

@@ -57,7 +57,7 @@ def __init__(self, address: SocketAddrT,
         self._timeout: Optional[float] = None
 
         if server:
-            self._sync(self._aqmp.start_server(address))
+            self._sync(self._aqmp.start_server(self._address))
 
     _T = TypeVar('_T')
 

python/qemu/aqmp/protocol.py

@@ -18,7 +18,6 @@
 from enum import Enum
 from functools import wraps
 import logging
-import socket
 from ssl import SSLContext
 from typing import (
     Any,
@@ -242,9 +241,6 @@ def __init__(self, name: Optional[str] = None) -> None:
         self._runstate = Runstate.IDLE
         self._runstate_changed: Optional[asyncio.Event] = None
 
-        # Workaround for bind()
-        self._sock: Optional[socket.socket] = None
-
         # Server state for start_server() and _incoming()
         self._server: Optional[asyncio.AbstractServer] = None
         self._accepted: Optional[asyncio.Event] = None
@@ -535,34 +531,6 @@ async def _incoming(self,
         self._reader, self._writer = (reader, writer)
         self._accepted.set()
 
-    def _bind_hack(self, address: Union[str, Tuple[str, int]]) -> None:
-        """
-        Used to create a socket in advance of accept().
-
-        This is a workaround to ensure that we can guarantee timing of
-        precisely when a socket exists to avoid a connection attempt
-        bouncing off of nothing.
-
-        Python 3.7+ adds a feature to separate the server creation and
-        listening phases instead, and should be used instead of this
-        hack.
-        """
-        if isinstance(address, tuple):
-            family = socket.AF_INET
-        else:
-            family = socket.AF_UNIX
-
-        sock = socket.socket(family, socket.SOCK_STREAM)
-        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-
-        try:
-            sock.bind(address)
-        except:
-            sock.close()
-            raise
-
-        self._sock = sock
-
     @upper_half
     async def _do_start_server(self, address: SocketAddrT,
                                ssl: Optional[SSLContext] = None) -> None:
@@ -589,21 +557,19 @@ async def _do_start_server(self, address: SocketAddrT,
         if isinstance(address, tuple):
             coro = asyncio.start_server(
                 self._incoming,
-                host=None if self._sock else address[0],
-                port=None if self._sock else address[1],
+                host=address[0],
+                port=address[1],
                 ssl=ssl,
                 backlog=1,
                 limit=self._limit,
-                sock=self._sock,
             )
         else:
             coro = asyncio.start_unix_server(
                 self._incoming,
-                path=None if self._sock else address,
+                path=address,
                 ssl=ssl,
                 backlog=1,
                 limit=self._limit,
-                sock=self._sock,
             )
 
         # Allow runstate watchers to witness 'CONNECTING' state; some
@@ -630,7 +596,6 @@ async def _do_accept(self) -> None:
         await self._accepted.wait()
         assert self._server is None
         self._accepted = None
-        self._sock = None
 
         self.logger.debug("Connection accepted.")