Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/tests/http/testenv/ports.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+# SPDX-License-Identifier: curl
+#
+###########################################################################
+#
+import logging
+import os
+import socket
+from collections.abc import Callable
+from typing import Dict
+
+from filelock import FileLock
+
+log = logging.getLogger(__name__)
+
+
+def alloc_port_set(port_specs: Dict[str, int]) -> Dict[str, int]:
+    socks = []
+    ports = {}
+    for name, ptype in port_specs.items():
+        try:
+            s = socket.socket(type=ptype)
+            s.bind(('127.0.0.1', 0))
+            ports[name] = s.getsockname()[1]
+            socks.append(s)
+        except Exception as e:
+            raise e
+    for s in socks:
+        s.close()
+    return ports
+
+
+def alloc_ports_and_do(port_spec: Dict[str, int],
+                       do_func: Callable[[Dict[str, int]], bool],
+                       gen_dir, max_tries=1) -> bool:
+    lock_file = os.path.join(gen_dir, 'ports.lock')
+    with FileLock(lock_file):
+        for _ in range(max_tries):
+            port_set = alloc_port_set(port_spec)
+            if do_func(port_set):
+                return True
+    return False