gh-93852: Add test.support.create_unix_domain_name() (#93914)

test_asyncio, test_logging, test_socket and test_socketserver now
create AF_UNIX domains in the current directory to no longer fail
with OSError("AF_UNIX path too long") if the temporary directory (the
TMPDIR environment variable) is too long.

Modify the following tests to use create_unix_domain_name():

* test_asyncio
* test_logging
* test_socket
* test_socketserver

test_asyncio.utils: remove unused time import.

Lib/test/test_socket.py

@@ -4,31 +4,30 @@ from test.support import os_helper
 from test.support import socket_helper
 from test.support import threading_helper
 
+import _thread as thread
+import array
+import contextlib
 import errno
 import io
 import itertools
-import socket
+import math
+import os
+import pickle
+import platform
+import queue
+import random
+import re
 import select
+import signal
+import socket
+import string
+import struct
+import sys
 import tempfile
+import threading
 import time
 import traceback
-import queue
-import sys
-import os
-import platform
-import array
-import contextlib
 from weakref import proxy
-import signal
-import math
-import pickle
-import re
-import struct
-import random
-import shutil
-import string
-import _thread as thread
-import threading
 try:
     import multiprocessing
 except ImportError:
@@ -605,17 +604,18 @@ class SocketTestBase(unittest.TestCase):
 
     def setUp(self):
         self.serv = self.newSocket()
+        self.addCleanup(self.close_server)
         self.bindServer()
 
+    def close_server(self):
+        self.serv.close()
+        self.serv = None
+
     def bindServer(self):
         """Bind server socket and set self.serv_addr to its address."""
         self.bindSock(self.serv)
         self.serv_addr = self.serv.getsockname()
 
-    def tearDown(self):
-        self.serv.close()
-        self.serv = None
-
 
 class SocketListeningTestMixin(SocketTestBase):
     """Mixin to listen on the server socket."""
@@ -700,15 +700,10 @@ class UnixSocketTestBase(SocketTestBase):
     # can't send anything that might be problematic for a privileged
     # user running the tests.
 
-    def setUp(self):
-        self.dir_path = tempfile.mkdtemp()
-        self.addCleanup(os.rmdir, self.dir_path)
-        super().setUp()
-
     def bindSock(self, sock):
-        path = tempfile.mktemp(dir=self.dir_path)
-        socket_helper.bind_unix_socket(sock, path)
+        path = socket_helper.create_unix_domain_name()
         self.addCleanup(os_helper.unlink, path)
+        socket_helper.bind_unix_socket(sock, path)
 
 class UnixStreamBase(UnixSocketTestBase):
     """Base class for Unix-domain SOCK_STREAM tests."""
@@ -1905,17 +1900,18 @@ class GeneralModuleTests(unittest.TestCase):
             self._test_socket_fileno(s, socket.AF_INET6, socket.SOCK_STREAM)
 
         if hasattr(socket, "AF_UNIX"):
-            tmpdir = tempfile.mkdtemp()
-            self.addCleanup(shutil.rmtree, tmpdir)
+            unix_name = socket_helper.create_unix_domain_name()
+            self.addCleanup(os_helper.unlink, unix_name)
+
             s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-            self.addCleanup(s.close)
-            try:
-                s.bind(os.path.join(tmpdir, 'socket'))
-            except PermissionError:
-                pass
-            else:
-                self._test_socket_fileno(s, socket.AF_UNIX,
-                                         socket.SOCK_STREAM)
+            with s:
+                try:
+                    s.bind(unix_name)
+                except PermissionError:
+                    pass
+                else:
+                    self._test_socket_fileno(s, socket.AF_UNIX,
+                                             socket.SOCK_STREAM)
 
     def test_socket_fileno_rejects_float(self):
         with self.assertRaises(TypeError):