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130 lines
4.0 KiB
Python
130 lines
4.0 KiB
Python
2 years ago
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# Copyright (c) Microsoft Corporation. All rights reserved.
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# Licensed under the MIT License. See LICENSE in the project root
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# for license information.
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import socket
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import sys
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import threading
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from debugpy.common import log
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from debugpy.common.util import hide_thread_from_debugger
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def create_server(host, port=0, backlog=socket.SOMAXCONN, timeout=None):
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"""Return a local server socket listening on the given port."""
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assert backlog > 0
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if host is None:
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host = "127.0.0.1"
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if port is None:
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port = 0
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try:
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server = _new_sock()
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if port != 0:
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# If binding to a specific port, make sure that the user doesn't have
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# to wait until the OS times out the socket to be able to use that port
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# again.if the server or the adapter crash or are force-killed.
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if sys.platform == "win32":
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server.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
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else:
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try:
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server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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except (AttributeError, OSError):
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pass # Not available everywhere
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server.bind((host, port))
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if timeout is not None:
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server.settimeout(timeout)
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server.listen(backlog)
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except Exception:
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server.close()
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raise
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return server
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def create_client():
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"""Return a client socket that may be connected to a remote address."""
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return _new_sock()
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def _new_sock():
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
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# Set TCP keepalive on an open socket.
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# It activates after 1 second (TCP_KEEPIDLE,) of idleness,
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# then sends a keepalive ping once every 3 seconds (TCP_KEEPINTVL),
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# and closes the connection after 5 failed ping (TCP_KEEPCNT), or 15 seconds
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try:
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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except (AttributeError, OSError):
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pass # May not be available everywhere.
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try:
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 1)
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except (AttributeError, OSError):
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pass # May not be available everywhere.
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try:
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 3)
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except (AttributeError, OSError):
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pass # May not be available everywhere.
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try:
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 5)
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except (AttributeError, OSError):
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pass # May not be available everywhere.
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return sock
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def shut_down(sock, how=socket.SHUT_RDWR):
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"""Shut down the given socket."""
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sock.shutdown(how)
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def close_socket(sock):
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"""Shutdown and close the socket."""
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try:
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shut_down(sock)
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except Exception:
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pass
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sock.close()
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def serve(name, handler, host, port=0, backlog=socket.SOMAXCONN, timeout=None):
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"""Accepts TCP connections on the specified host and port, and invokes the
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provided handler function for every new connection.
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Returns the created server socket.
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"""
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assert backlog > 0
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try:
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listener = create_server(host, port, backlog, timeout)
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except Exception:
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log.reraise_exception(
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"Error listening for incoming {0} connections on {1}:{2}:", name, host, port
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)
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host, port = listener.getsockname()
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log.info("Listening for incoming {0} connections on {1}:{2}...", name, host, port)
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def accept_worker():
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while True:
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try:
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sock, (other_host, other_port) = listener.accept()
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except (OSError, socket.error):
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# Listener socket has been closed.
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break
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log.info(
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"Accepted incoming {0} connection from {1}:{2}.",
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name,
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other_host,
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other_port,
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)
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handler(sock)
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thread = threading.Thread(target=accept_worker)
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thread.daemon = True
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hide_thread_from_debugger(thread)
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thread.start()
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return listener
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