Fix create_unix_server to support Path-like objects (PEP 519)

asyncio/unix_events.py

@@ -39,6 +39,13 @@ def _sighandler_noop(signum, frame):
     pass
 
 
+try:
+    _fspath = os.fspath
+except AttributeError:
+    # Python 3.5 or earlier
+    _fspath = lambda path: path
+
+
 class _UnixSelectorEventLoop(selector_events.BaseSelectorEventLoop):
     """Unix event loop.
 
@@ -256,6 +263,7 @@ def create_unix_server(self, protocol_factory, path=None, *,
                 raise ValueError(
                     'path and sock can not be specified at the same time')
 
+            path = _fspath(path)
             sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
 
             # Check for abstract socket. `str` and `bytes` paths are supported.

tests/test_unix_events.py

@@ -4,6 +4,7 @@
 import errno
 import io
 import os
+import pathlib
 import signal
 import socket
 import stat
@@ -251,6 +252,15 @@ def test_create_unix_server_existing_path_sock(self):
             srv.close()
             self.loop.run_until_complete(srv.wait_closed())
 
+    @unittest.skipUnless(hasattr(os, 'fspath'), 'no os.fspath')
+    def test_create_unix_server_pathlib(self):
+        with test_utils.unix_socket_path() as path:
+            path = pathlib.Path(path)
+            srv_coro = self.loop.create_unix_server(lambda: None, path)
+            srv = self.loop.run_until_complete(srv_coro)
+            srv.close()
+            self.loop.run_until_complete(srv.wait_closed())
+
     def test_create_unix_server_existing_path_nonsock(self):
         with tempfile.NamedTemporaryFile() as file:
             coro = self.loop.create_unix_server(lambda: None, file.name)