two version of R2R are here HEAD master

1 files changed, 1191 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/websockets/legacy/server.py b/.venv/lib/python3.12/site-packages/websockets/legacy/server.py
new file mode 100644
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+++ b/.venv/lib/python3.12/site-packages/websockets/legacy/server.py
@@ -0,0 +1,1191 @@
+from __future__ import annotations
+
+import asyncio
+import email.utils
+import functools
+import http
+import inspect
+import logging
+import socket
+import warnings
+from collections.abc import Awaitable, Generator, Iterable, Sequence
+from types import TracebackType
+from typing import Any, Callable, Union, cast
+
+from ..asyncio.compatibility import asyncio_timeout
+from ..datastructures import Headers, HeadersLike, MultipleValuesError
+from ..exceptions import (
+    InvalidHandshake,
+    InvalidHeader,
+    InvalidMessage,
+    InvalidOrigin,
+    InvalidUpgrade,
+    NegotiationError,
+)
+from ..extensions import Extension, ServerExtensionFactory
+from ..extensions.permessage_deflate import enable_server_permessage_deflate
+from ..headers import (
+    build_extension,
+    parse_extension,
+    parse_subprotocol,
+    validate_subprotocols,
+)
+from ..http11 import SERVER
+from ..protocol import State
+from ..typing import ExtensionHeader, LoggerLike, Origin, StatusLike, Subprotocol
+from .exceptions import AbortHandshake
+from .handshake import build_response, check_request
+from .http import read_request
+from .protocol import WebSocketCommonProtocol, broadcast
+
+
+__all__ = [
+    "broadcast",
+    "serve",
+    "unix_serve",
+    "WebSocketServerProtocol",
+    "WebSocketServer",
+]
+
+
+# Change to HeadersLike | ... when dropping Python < 3.10.
+HeadersLikeOrCallable = Union[HeadersLike, Callable[[str, Headers], HeadersLike]]
+
+HTTPResponse = tuple[StatusLike, HeadersLike, bytes]
+
+
+class WebSocketServerProtocol(WebSocketCommonProtocol):
+    """
+    WebSocket server connection.
+
+    :class:`WebSocketServerProtocol` provides :meth:`recv` and :meth:`send`
+    coroutines for receiving and sending messages.
+
+    It supports asynchronous iteration to receive messages::
+
+        async for message in websocket:
+            await process(message)
+
+    The iterator exits normally when the connection is closed with close code
+    1000 (OK) or 1001 (going away) or without a close code. It raises
+    a :exc:`~websockets.exceptions.ConnectionClosedError` when the connection
+    is closed with any other code.
+
+    You may customize the opening handshake in a subclass by
+    overriding :meth:`process_request` or :meth:`select_subprotocol`.
+
+    Args:
+        ws_server: WebSocket server that created this connection.
+
+    See :func:`serve` for the documentation of ``ws_handler``, ``logger``, ``origins``,
+    ``extensions``, ``subprotocols``, ``extra_headers``, and ``server_header``.
+
+    See :class:`~websockets.legacy.protocol.WebSocketCommonProtocol` for the
+    documentation of ``ping_interval``, ``ping_timeout``, ``close_timeout``,
+    ``max_size``, ``max_queue``, ``read_limit``, and ``write_limit``.
+
+    """
+
+    is_client = False
+    side = "server"
+
+    def __init__(
+        self,
+        # The version that accepts the path in the second argument is deprecated.
+        ws_handler: (
+            Callable[[WebSocketServerProtocol], Awaitable[Any]]
+            | Callable[[WebSocketServerProtocol, str], Awaitable[Any]]
+        ),
+        ws_server: WebSocketServer,
+        *,
+        logger: LoggerLike | None = None,
+        origins: Sequence[Origin | None] | None = None,
+        extensions: Sequence[ServerExtensionFactory] | None = None,
+        subprotocols: Sequence[Subprotocol] | None = None,
+        extra_headers: HeadersLikeOrCallable | None = None,
+        server_header: str | None = SERVER,
+        process_request: (
+            Callable[[str, Headers], Awaitable[HTTPResponse | None]] | None
+        ) = None,
+        select_subprotocol: (
+            Callable[[Sequence[Subprotocol], Sequence[Subprotocol]], Subprotocol] | None
+        ) = None,
+        open_timeout: float | None = 10,
+        **kwargs: Any,
+    ) -> None:
+        if logger is None:
+            logger = logging.getLogger("websockets.server")
+        super().__init__(logger=logger, **kwargs)
+        # For backwards compatibility with 6.0 or earlier.
+        if origins is not None and "" in origins:
+            warnings.warn("use None instead of '' in origins", DeprecationWarning)
+            origins = [None if origin == "" else origin for origin in origins]
+        # For backwards compatibility with 10.0 or earlier. Done here in
+        # addition to serve to trigger the deprecation warning on direct
+        # use of WebSocketServerProtocol.
+        self.ws_handler = remove_path_argument(ws_handler)
+        self.ws_server = ws_server
+        self.origins = origins
+        self.available_extensions = extensions
+        self.available_subprotocols = subprotocols
+        self.extra_headers = extra_headers
+        self.server_header = server_header
+        self._process_request = process_request
+        self._select_subprotocol = select_subprotocol
+        self.open_timeout = open_timeout
+
+    def connection_made(self, transport: asyncio.BaseTransport) -> None:
+        """
+        Register connection and initialize a task to handle it.
+
+        """
+        super().connection_made(transport)
+        # Register the connection with the server before creating the handler
+        # task. Registering at the beginning of the handler coroutine would
+        # create a race condition between the creation of the task, which
+        # schedules its execution, and the moment the handler starts running.
+        self.ws_server.register(self)
+        self.handler_task = self.loop.create_task(self.handler())
+
+    async def handler(self) -> None:
+        """
+        Handle the lifecycle of a WebSocket connection.
+
+        Since this method doesn't have a caller able to handle exceptions, it
+        attempts to log relevant ones and guarantees that the TCP connection is
+        closed before exiting.
+
+        """
+        try:
+            try:
+                async with asyncio_timeout(self.open_timeout):
+                    await self.handshake(
+                        origins=self.origins,
+                        available_extensions=self.available_extensions,
+                        available_subprotocols=self.available_subprotocols,
+                        extra_headers=self.extra_headers,
+                    )
+            except asyncio.TimeoutError:  # pragma: no cover
+                raise
+            except ConnectionError:
+                raise
+            except Exception as exc:
+                if isinstance(exc, AbortHandshake):
+                    status, headers, body = exc.status, exc.headers, exc.body
+                elif isinstance(exc, InvalidOrigin):
+                    if self.debug:
+                        self.logger.debug("! invalid origin", exc_info=True)
+                    status, headers, body = (
+                        http.HTTPStatus.FORBIDDEN,
+                        Headers(),
+                        f"Failed to open a WebSocket connection: {exc}.\n".encode(),
+                    )
+                elif isinstance(exc, InvalidUpgrade):
+                    if self.debug:
+                        self.logger.debug("! invalid upgrade", exc_info=True)
+                    status, headers, body = (
+                        http.HTTPStatus.UPGRADE_REQUIRED,
+                        Headers([("Upgrade", "websocket")]),
+                        (
+                            f"Failed to open a WebSocket connection: {exc}.\n"
+                            f"\n"
+                            f"You cannot access a WebSocket server directly "
+                            f"with a browser. You need a WebSocket client.\n"
+                        ).encode(),
+                    )
+                elif isinstance(exc, InvalidHandshake):
+                    if self.debug:
+                        self.logger.debug("! invalid handshake", exc_info=True)
+                    exc_chain = cast(BaseException, exc)
+                    exc_str = f"{exc_chain}"
+                    while exc_chain.__cause__ is not None:
+                        exc_chain = exc_chain.__cause__
+                        exc_str += f"; {exc_chain}"
+                    status, headers, body = (
+                        http.HTTPStatus.BAD_REQUEST,
+                        Headers(),
+                        f"Failed to open a WebSocket connection: {exc_str}.\n".encode(),
+                    )
+                else:
+                    self.logger.error("opening handshake failed", exc_info=True)
+                    status, headers, body = (
+                        http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                        Headers(),
+                        (
+                            b"Failed to open a WebSocket connection.\n"
+                            b"See server log for more information.\n"
+                        ),
+                    )
+
+                headers.setdefault("Date", email.utils.formatdate(usegmt=True))
+                if self.server_header:
+                    headers.setdefault("Server", self.server_header)
+
+                headers.setdefault("Content-Length", str(len(body)))
+                headers.setdefault("Content-Type", "text/plain")
+                headers.setdefault("Connection", "close")
+
+                self.write_http_response(status, headers, body)
+                self.logger.info(
+                    "connection rejected (%d %s)", status.value, status.phrase
+                )
+                await self.close_transport()
+                return
+
+            try:
+                await self.ws_handler(self)
+            except Exception:
+                self.logger.error("connection handler failed", exc_info=True)
+                if not self.closed:
+                    self.fail_connection(1011)
+                raise
+
+            try:
+                await self.close()
+            except ConnectionError:
+                raise
+            except Exception:
+                self.logger.error("closing handshake failed", exc_info=True)
+                raise
+
+        except Exception:
+            # Last-ditch attempt to avoid leaking connections on errors.
+            try:
+                self.transport.close()
+            except Exception:  # pragma: no cover
+                pass
+
+        finally:
+            # Unregister the connection with the server when the handler task
+            # terminates. Registration is tied to the lifecycle of the handler
+            # task because the server waits for tasks attached to registered
+            # connections before terminating.
+            self.ws_server.unregister(self)
+            self.logger.info("connection closed")
+
+    async def read_http_request(self) -> tuple[str, Headers]:
+        """
+        Read request line and headers from the HTTP request.
+
+        If the request contains a body, it may be read from ``self.reader``
+        after this coroutine returns.
+
+        Raises:
+            InvalidMessage: If the HTTP message is malformed or isn't an
+                HTTP/1.1 GET request.
+
+        """
+        try:
+            path, headers = await read_request(self.reader)
+        except asyncio.CancelledError:  # pragma: no cover
+            raise
+        except Exception as exc:
+            raise InvalidMessage("did not receive a valid HTTP request") from exc
+
+        if self.debug:
+            self.logger.debug("< GET %s HTTP/1.1", path)
+            for key, value in headers.raw_items():
+                self.logger.debug("< %s: %s", key, value)
+
+        self.path = path
+        self.request_headers = headers
+
+        return path, headers
+
+    def write_http_response(
+        self, status: http.HTTPStatus, headers: Headers, body: bytes | None = None
+    ) -> None:
+        """
+        Write status line and headers to the HTTP response.
+
+        This coroutine is also able to write a response body.
+
+        """
+        self.response_headers = headers
+
+        if self.debug:
+            self.logger.debug("> HTTP/1.1 %d %s", status.value, status.phrase)
+            for key, value in headers.raw_items():
+                self.logger.debug("> %s: %s", key, value)
+            if body is not None:
+                self.logger.debug("> [body] (%d bytes)", len(body))
+
+        # Since the status line and headers only contain ASCII characters,
+        # we can keep this simple.
+        response = f"HTTP/1.1 {status.value} {status.phrase}\r\n"
+        response += str(headers)
+
+        self.transport.write(response.encode())
+
+        if body is not None:
+            self.transport.write(body)
+
+    async def process_request(
+        self, path: str, request_headers: Headers
+    ) -> HTTPResponse | None:
+        """
+        Intercept the HTTP request and return an HTTP response if appropriate.
+
+        You may override this method in a :class:`WebSocketServerProtocol`
+        subclass, for example:
+
+        * to return an HTTP 200 OK response on a given path; then a load
+          balancer can use this path for a health check;
+        * to authenticate the request and return an HTTP 401 Unauthorized or an
+          HTTP 403 Forbidden when authentication fails.
+
+        You may also override this method with the ``process_request``
+        argument of :func:`serve` and :class:`WebSocketServerProtocol`. This
+        is equivalent, except ``process_request`` won't have access to the
+        protocol instance, so it can't store information for later use.
+
+        :meth:`process_request` is expected to complete quickly. If it may run
+        for a long time, then it should await :meth:`wait_closed` and exit if
+        :meth:`wait_closed` completes, or else it could prevent the server
+        from shutting down.
+
+        Args:
+            path: Request path, including optional query string.
+            request_headers: Request headers.
+
+        Returns:
+            tuple[StatusLike, HeadersLike, bytes] | None: :obj:`None` to
+            continue the WebSocket handshake normally.
+
+            An HTTP response, represented by a 3-uple of the response status,
+            headers, and body, to abort the WebSocket handshake and return
+            that HTTP response instead.
+
+        """
+        if self._process_request is not None:
+            response = self._process_request(path, request_headers)
+            if isinstance(response, Awaitable):
+                return await response
+            else:
+                # For backwards compatibility with 7.0.
+                warnings.warn(
+                    "declare process_request as a coroutine", DeprecationWarning
+                )
+                return response
+        return None
+
+    @staticmethod
+    def process_origin(
+        headers: Headers, origins: Sequence[Origin | None] | None = None
+    ) -> Origin | None:
+        """
+        Handle the Origin HTTP request header.
+
+        Args:
+            headers: Request headers.
+            origins: Optional list of acceptable origins.
+
+        Raises:
+            InvalidOrigin: If the origin isn't acceptable.
+
+        """
+        # "The user agent MUST NOT include more than one Origin header field"
+        # per https://datatracker.ietf.org/doc/html/rfc6454#section-7.3.
+        try:
+            origin = headers.get("Origin")
+        except MultipleValuesError as exc:
+            raise InvalidHeader("Origin", "multiple values") from exc
+        if origin is not None:
+            origin = cast(Origin, origin)
+        if origins is not None:
+            if origin not in origins:
+                raise InvalidOrigin(origin)
+        return origin
+
+    @staticmethod
+    def process_extensions(
+        headers: Headers,
+        available_extensions: Sequence[ServerExtensionFactory] | None,
+    ) -> tuple[str | None, list[Extension]]:
+        """
+        Handle the Sec-WebSocket-Extensions HTTP request header.
+
+        Accept or reject each extension proposed in the client request.
+        Negotiate parameters for accepted extensions.
+
+        Return the Sec-WebSocket-Extensions HTTP response header and the list
+        of accepted extensions.
+
+        :rfc:`6455` leaves the rules up to the specification of each
+        :extension.
+
+        To provide this level of flexibility, for each extension proposed by
+        the client, we check for a match with each extension available in the
+        server configuration. If no match is found, the extension is ignored.
+
+        If several variants of the same extension are proposed by the client,
+        it may be accepted several times, which won't make sense in general.
+        Extensions must implement their own requirements. For this purpose,
+        the list of previously accepted extensions is provided.
+
+        This process doesn't allow the server to reorder extensions. It can
+        only select a subset of the extensions proposed by the client.
+
+        Other requirements, for example related to mandatory extensions or the
+        order of extensions, may be implemented by overriding this method.
+
+        Args:
+            headers: Request headers.
+            extensions: Optional list of supported extensions.
+
+        Raises:
+            InvalidHandshake: To abort the handshake with an HTTP 400 error.
+
+        """
+        response_header_value: str | None = None
+
+        extension_headers: list[ExtensionHeader] = []
+        accepted_extensions: list[Extension] = []
+
+        header_values = headers.get_all("Sec-WebSocket-Extensions")
+
+        if header_values and available_extensions:
+            parsed_header_values: list[ExtensionHeader] = sum(
+                [parse_extension(header_value) for header_value in header_values], []
+            )
+
+            for name, request_params in parsed_header_values:
+                for ext_factory in available_extensions:
+                    # Skip non-matching extensions based on their name.
+                    if ext_factory.name != name:
+                        continue
+
+                    # Skip non-matching extensions based on their params.
+                    try:
+                        response_params, extension = ext_factory.process_request_params(
+                            request_params, accepted_extensions
+                        )
+                    except NegotiationError:
+                        continue
+
+                    # Add matching extension to the final list.
+                    extension_headers.append((name, response_params))
+                    accepted_extensions.append(extension)
+
+                    # Break out of the loop once we have a match.
+                    break
+
+                # If we didn't break from the loop, no extension in our list
+                # matched what the client sent. The extension is declined.
+
+        # Serialize extension header.
+        if extension_headers:
+            response_header_value = build_extension(extension_headers)
+
+        return response_header_value, accepted_extensions
+
+    # Not @staticmethod because it calls self.select_subprotocol()
+    def process_subprotocol(
+        self, headers: Headers, available_subprotocols: Sequence[Subprotocol] | None
+    ) -> Subprotocol | None:
+        """
+        Handle the Sec-WebSocket-Protocol HTTP request header.
+
+        Return Sec-WebSocket-Protocol HTTP response header, which is the same
+        as the selected subprotocol.
+
+        Args:
+            headers: Request headers.
+            available_subprotocols: Optional list of supported subprotocols.
+
+        Raises:
+            InvalidHandshake: To abort the handshake with an HTTP 400 error.
+
+        """
+        subprotocol: Subprotocol | None = None
+
+        header_values = headers.get_all("Sec-WebSocket-Protocol")
+
+        if header_values and available_subprotocols:
+            parsed_header_values: list[Subprotocol] = sum(
+                [parse_subprotocol(header_value) for header_value in header_values], []
+            )
+
+            subprotocol = self.select_subprotocol(
+                parsed_header_values, available_subprotocols
+            )
+
+        return subprotocol
+
+    def select_subprotocol(
+        self,
+        client_subprotocols: Sequence[Subprotocol],
+        server_subprotocols: Sequence[Subprotocol],
+    ) -> Subprotocol | None:
+        """
+        Pick a subprotocol among those supported by the client and the server.
+
+        If several subprotocols are available, select the preferred subprotocol
+        by giving equal weight to the preferences of the client and the server.
+
+        If no subprotocol is available, proceed without a subprotocol.
+
+        You may provide a ``select_subprotocol`` argument to :func:`serve` or
+        :class:`WebSocketServerProtocol` to override this logic. For example,
+        you could reject the handshake if the client doesn't support a
+        particular subprotocol, rather than accept the handshake without that
+        subprotocol.
+
+        Args:
+            client_subprotocols: List of subprotocols offered by the client.
+            server_subprotocols: List of subprotocols available on the server.
+
+        Returns:
+            Selected subprotocol, if a common subprotocol was found.
+
+            :obj:`None` to continue without a subprotocol.
+
+        """
+        if self._select_subprotocol is not None:
+            return self._select_subprotocol(client_subprotocols, server_subprotocols)
+
+        subprotocols = set(client_subprotocols) & set(server_subprotocols)
+        if not subprotocols:
+            return None
+        return sorted(
+            subprotocols,
+            key=lambda p: client_subprotocols.index(p) + server_subprotocols.index(p),
+        )[0]
+
+    async def handshake(
+        self,
+        origins: Sequence[Origin | None] | None = None,
+        available_extensions: Sequence[ServerExtensionFactory] | None = None,
+        available_subprotocols: Sequence[Subprotocol] | None = None,
+        extra_headers: HeadersLikeOrCallable | None = None,
+    ) -> str:
+        """
+        Perform the server side of the opening handshake.
+
+        Args:
+            origins: List of acceptable values of the Origin HTTP header;
+                include :obj:`None` if the lack of an origin is acceptable.
+            extensions: List of supported extensions, in order in which they
+                should be tried.
+            subprotocols: List of supported subprotocols, in order of
+                decreasing preference.
+            extra_headers: Arbitrary HTTP headers to add to the response when
+                the handshake succeeds.
+
+        Returns:
+            path of the URI of the request.
+
+        Raises:
+            InvalidHandshake: If the handshake fails.
+
+        """
+        path, request_headers = await self.read_http_request()
+
+        # Hook for customizing request handling, for example checking
+        # authentication or treating some paths as plain HTTP endpoints.
+        early_response_awaitable = self.process_request(path, request_headers)
+        if isinstance(early_response_awaitable, Awaitable):
+            early_response = await early_response_awaitable
+        else:
+            # For backwards compatibility with 7.0.
+            warnings.warn("declare process_request as a coroutine", DeprecationWarning)
+            early_response = early_response_awaitable
+
+        # The connection may drop while process_request is running.
+        if self.state is State.CLOSED:
+            # This subclass of ConnectionError is silently ignored in handler().
+            raise BrokenPipeError("connection closed during opening handshake")
+
+        # Change the response to a 503 error if the server is shutting down.
+        if not self.ws_server.is_serving():
+            early_response = (
+                http.HTTPStatus.SERVICE_UNAVAILABLE,
+                [],
+                b"Server is shutting down.\n",
+            )
+
+        if early_response is not None:
+            raise AbortHandshake(*early_response)
+
+        key = check_request(request_headers)
+
+        self.origin = self.process_origin(request_headers, origins)
+
+        extensions_header, self.extensions = self.process_extensions(
+            request_headers, available_extensions
+        )
+
+        protocol_header = self.subprotocol = self.process_subprotocol(
+            request_headers, available_subprotocols
+        )
+
+        response_headers = Headers()
+
+        build_response(response_headers, key)
+
+        if extensions_header is not None:
+            response_headers["Sec-WebSocket-Extensions"] = extensions_header
+
+        if protocol_header is not None:
+            response_headers["Sec-WebSocket-Protocol"] = protocol_header
+
+        if callable(extra_headers):
+            extra_headers = extra_headers(path, self.request_headers)
+        if extra_headers is not None:
+            response_headers.update(extra_headers)
+
+        response_headers.setdefault("Date", email.utils.formatdate(usegmt=True))
+        if self.server_header is not None:
+            response_headers.setdefault("Server", self.server_header)
+
+        self.write_http_response(http.HTTPStatus.SWITCHING_PROTOCOLS, response_headers)
+
+        self.logger.info("connection open")
+
+        self.connection_open()
+
+        return path
+
+
+class WebSocketServer:
+    """
+    WebSocket server returned by :func:`serve`.
+
+    This class mirrors the API of :class:`~asyncio.Server`.
+
+    It keeps track of WebSocket connections in order to close them properly
+    when shutting down.
+
+    Args:
+        logger: Logger for this server.
+            It defaults to ``logging.getLogger("websockets.server")``.
+            See the :doc:`logging guide <../../topics/logging>` for details.
+
+    """
+
+    def __init__(self, logger: LoggerLike | None = None) -> None:
+        if logger is None:
+            logger = logging.getLogger("websockets.server")
+        self.logger = logger
+
+        # Keep track of active connections.
+        self.websockets: set[WebSocketServerProtocol] = set()
+
+        # Task responsible for closing the server and terminating connections.
+        self.close_task: asyncio.Task[None] | None = None
+
+        # Completed when the server is closed and connections are terminated.
+        self.closed_waiter: asyncio.Future[None]
+
+    def wrap(self, server: asyncio.base_events.Server) -> None:
+        """
+        Attach to a given :class:`~asyncio.Server`.
+
+        Since :meth:`~asyncio.loop.create_server` doesn't support injecting a
+        custom ``Server`` class, the easiest solution that doesn't rely on
+        private :mod:`asyncio` APIs is to:
+
+        - instantiate a :class:`WebSocketServer`
+        - give the protocol factory a reference to that instance
+        - call :meth:`~asyncio.loop.create_server` with the factory
+        - attach the resulting :class:`~asyncio.Server` with this method
+
+        """
+        self.server = server
+        for sock in server.sockets:
+            if sock.family == socket.AF_INET:
+                name = "%s:%d" % sock.getsockname()
+            elif sock.family == socket.AF_INET6:
+                name = "[%s]:%d" % sock.getsockname()[:2]
+            elif sock.family == socket.AF_UNIX:
+                name = sock.getsockname()
+            # In the unlikely event that someone runs websockets over a
+            # protocol other than IP or Unix sockets, avoid crashing.
+            else:  # pragma: no cover
+                name = str(sock.getsockname())
+            self.logger.info("server listening on %s", name)
+
+        # Initialized here because we need a reference to the event loop.
+        # This should be moved back to __init__ when dropping Python < 3.10.
+        self.closed_waiter = server.get_loop().create_future()
+
+    def register(self, protocol: WebSocketServerProtocol) -> None:
+        """
+        Register a connection with this server.
+
+        """
+        self.websockets.add(protocol)
+
+    def unregister(self, protocol: WebSocketServerProtocol) -> None:
+        """
+        Unregister a connection with this server.
+
+        """
+        self.websockets.remove(protocol)
+
+    def close(self, close_connections: bool = True) -> None:
+        """
+        Close the server.
+
+        * Close the underlying :class:`~asyncio.Server`.
+        * When ``close_connections`` is :obj:`True`, which is the default,
+          close existing connections. Specifically:
+
+          * Reject opening WebSocket connections with an HTTP 503 (service
+            unavailable) error. This happens when the server accepted the TCP
+            connection but didn't complete the opening handshake before closing.
+          * Close open WebSocket connections with close code 1001 (going away).
+
+        * Wait until all connection handlers terminate.
+
+        :meth:`close` is idempotent.
+
+        """
+        if self.close_task is None:
+            self.close_task = self.get_loop().create_task(
+                self._close(close_connections)
+            )
+
+    async def _close(self, close_connections: bool) -> None:
+        """
+        Implementation of :meth:`close`.
+
+        This calls :meth:`~asyncio.Server.close` on the underlying
+        :class:`~asyncio.Server` object to stop accepting new connections and
+        then closes open connections with close code 1001.
+
+        """
+        self.logger.info("server closing")
+
+        # Stop accepting new connections.
+        self.server.close()
+
+        # Wait until all accepted connections reach connection_made() and call
+        # register(). See https://github.com/python/cpython/issues/79033 for
+        # details. This workaround can be removed when dropping Python < 3.11.
+        await asyncio.sleep(0)
+
+        if close_connections:
+            # Close OPEN connections with close code 1001. After server.close(),
+            # handshake() closes OPENING connections with an HTTP 503 error.
+            close_tasks = [
+                asyncio.create_task(websocket.close(1001))
+                for websocket in self.websockets
+                if websocket.state is not State.CONNECTING
+            ]
+            # asyncio.wait doesn't accept an empty first argument.
+            if close_tasks:
+                await asyncio.wait(close_tasks)
+
+        # Wait until all TCP connections are closed.
+        await self.server.wait_closed()
+
+        # Wait until all connection handlers terminate.
+        # asyncio.wait doesn't accept an empty first argument.
+        if self.websockets:
+            await asyncio.wait(
+                [websocket.handler_task for websocket in self.websockets]
+            )
+
+        # Tell wait_closed() to return.
+        self.closed_waiter.set_result(None)
+
+        self.logger.info("server closed")
+
+    async def wait_closed(self) -> None:
+        """
+        Wait until the server is closed.
+
+        When :meth:`wait_closed` returns, all TCP connections are closed and
+        all connection handlers have returned.
+
+        To ensure a fast shutdown, a connection handler should always be
+        awaiting at least one of:
+
+        * :meth:`~WebSocketServerProtocol.recv`: when the connection is closed,
+          it raises :exc:`~websockets.exceptions.ConnectionClosedOK`;
+        * :meth:`~WebSocketServerProtocol.wait_closed`: when the connection is
+          closed, it returns.
+
+        Then the connection handler is immediately notified of the shutdown;
+        it can clean up and exit.
+
+        """
+        await asyncio.shield(self.closed_waiter)
+
+    def get_loop(self) -> asyncio.AbstractEventLoop:
+        """
+        See :meth:`asyncio.Server.get_loop`.
+
+        """
+        return self.server.get_loop()
+
+    def is_serving(self) -> bool:
+        """
+        See :meth:`asyncio.Server.is_serving`.
+
+        """
+        return self.server.is_serving()
+
+    async def start_serving(self) -> None:  # pragma: no cover
+        """
+        See :meth:`asyncio.Server.start_serving`.
+
+        Typical use::
+
+            server = await serve(..., start_serving=False)
+            # perform additional setup here...
+            # ... then start the server
+            await server.start_serving()
+
+        """
+        await self.server.start_serving()
+
+    async def serve_forever(self) -> None:  # pragma: no cover
+        """
+        See :meth:`asyncio.Server.serve_forever`.
+
+        Typical use::
+
+            server = await serve(...)
+            # this coroutine doesn't return
+            # canceling it stops the server
+            await server.serve_forever()
+
+        This is an alternative to using :func:`serve` as an asynchronous context
+        manager. Shutdown is triggered by canceling :meth:`serve_forever`
+        instead of exiting a :func:`serve` context.
+
+        """
+        await self.server.serve_forever()
+
+    @property
+    def sockets(self) -> Iterable[socket.socket]:
+        """
+        See :attr:`asyncio.Server.sockets`.
+
+        """
+        return self.server.sockets
+
+    async def __aenter__(self) -> WebSocketServer:  # pragma: no cover
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:  # pragma: no cover
+        self.close()
+        await self.wait_closed()
+
+
+class Serve:
+    """
+    Start a WebSocket server listening on ``host`` and ``port``.
+
+    Whenever a client connects, the server creates a
+    :class:`WebSocketServerProtocol`, performs the opening handshake, and
+    delegates to the connection handler, ``ws_handler``.
+
+    The handler receives the :class:`WebSocketServerProtocol` and uses it to
+    send and receive messages.
+
+    Once the handler completes, either normally or with an exception, the
+    server performs the closing handshake and closes the connection.
+
+    Awaiting :func:`serve` yields a :class:`WebSocketServer`. This object
+    provides a :meth:`~WebSocketServer.close` method to shut down the server::
+
+        # set this future to exit the server
+        stop = asyncio.get_running_loop().create_future()
+
+        server = await serve(...)
+        await stop
+        server.close()
+        await server.wait_closed()
+
+    :func:`serve` can be used as an asynchronous context manager. Then, the
+    server is shut down automatically when exiting the context::
+
+        # set this future to exit the server
+        stop = asyncio.get_running_loop().create_future()
+
+        async with serve(...):
+            await stop
+
+    Args:
+        ws_handler: Connection handler. It receives the WebSocket connection,
+            which is a :class:`WebSocketServerProtocol`, in argument.
+        host: Network interfaces the server binds to.
+            See :meth:`~asyncio.loop.create_server` for details.
+        port: TCP port the server listens on.
+            See :meth:`~asyncio.loop.create_server` for details.
+        create_protocol: Factory for the :class:`asyncio.Protocol` managing
+            the connection. It defaults to :class:`WebSocketServerProtocol`.
+            Set it to a wrapper or a subclass to customize connection handling.
+        logger: Logger for this server.
+            It defaults to ``logging.getLogger("websockets.server")``.
+            See the :doc:`logging guide <../../topics/logging>` for details.
+        compression: The "permessage-deflate" extension is enabled by default.
+            Set ``compression`` to :obj:`None` to disable it. See the
+            :doc:`compression guide <../../topics/compression>` for details.
+        origins: Acceptable values of the ``Origin`` header, for defending
+            against Cross-Site WebSocket Hijacking attacks. Include :obj:`None`
+            in the list if the lack of an origin is acceptable.
+        extensions: List of supported extensions, in order in which they
+            should be negotiated and run.
+        subprotocols: List of supported subprotocols, in order of decreasing
+            preference.
+        extra_headers (HeadersLike | Callable[[str, Headers] | HeadersLike]):
+            Arbitrary HTTP headers to add to the response. This can be
+            a :data:`~websockets.datastructures.HeadersLike` or a callable
+            taking the request path and headers in arguments and returning
+            a :data:`~websockets.datastructures.HeadersLike`.
+        server_header: Value of  the ``Server`` response header.
+            It defaults to ``"Python/x.y.z websockets/X.Y"``.
+            Setting it to :obj:`None` removes the header.
+        process_request (Callable[[str, Headers], \
+            Awaitable[tuple[StatusLike, HeadersLike, bytes] | None]] | None):
+            Intercept HTTP request before the opening handshake.
+            See :meth:`~WebSocketServerProtocol.process_request` for details.
+        select_subprotocol: Select a subprotocol supported by the client.
+            See :meth:`~WebSocketServerProtocol.select_subprotocol` for details.
+        open_timeout: Timeout for opening connections in seconds.
+            :obj:`None` disables the timeout.
+
+    See :class:`~websockets.legacy.protocol.WebSocketCommonProtocol` for the
+    documentation of ``ping_interval``, ``ping_timeout``, ``close_timeout``,
+    ``max_size``, ``max_queue``, ``read_limit``, and ``write_limit``.
+
+    Any other keyword arguments are passed the event loop's
+    :meth:`~asyncio.loop.create_server` method.
+
+    For example:
+
+    * You can set ``ssl`` to a :class:`~ssl.SSLContext` to enable TLS.
+
+    * You can set ``sock`` to a :obj:`~socket.socket` that you created
+      outside of websockets.
+
+    Returns:
+        WebSocket server.
+
+    """
+
+    def __init__(
+        self,
+        # The version that accepts the path in the second argument is deprecated.
+        ws_handler: (
+            Callable[[WebSocketServerProtocol], Awaitable[Any]]
+            | Callable[[WebSocketServerProtocol, str], Awaitable[Any]]
+        ),
+        host: str | Sequence[str] | None = None,
+        port: int | None = None,
+        *,
+        create_protocol: Callable[..., WebSocketServerProtocol] | None = None,
+        logger: LoggerLike | None = None,
+        compression: str | None = "deflate",
+        origins: Sequence[Origin | None] | None = None,
+        extensions: Sequence[ServerExtensionFactory] | None = None,
+        subprotocols: Sequence[Subprotocol] | None = None,
+        extra_headers: HeadersLikeOrCallable | None = None,
+        server_header: str | None = SERVER,
+        process_request: (
+            Callable[[str, Headers], Awaitable[HTTPResponse | None]] | None
+        ) = None,
+        select_subprotocol: (
+            Callable[[Sequence[Subprotocol], Sequence[Subprotocol]], Subprotocol] | None
+        ) = None,
+        open_timeout: float | None = 10,
+        ping_interval: float | None = 20,
+        ping_timeout: float | None = 20,
+        close_timeout: float | None = None,
+        max_size: int | None = 2**20,
+        max_queue: int | None = 2**5,
+        read_limit: int = 2**16,
+        write_limit: int = 2**16,
+        **kwargs: Any,
+    ) -> None:
+        # Backwards compatibility: close_timeout used to be called timeout.
+        timeout: float | None = kwargs.pop("timeout", None)
+        if timeout is None:
+            timeout = 10
+        else:
+            warnings.warn("rename timeout to close_timeout", DeprecationWarning)
+        # If both are specified, timeout is ignored.
+        if close_timeout is None:
+            close_timeout = timeout
+
+        # Backwards compatibility: create_protocol used to be called klass.
+        klass: type[WebSocketServerProtocol] | None = kwargs.pop("klass", None)
+        if klass is None:
+            klass = WebSocketServerProtocol
+        else:
+            warnings.warn("rename klass to create_protocol", DeprecationWarning)
+        # If both are specified, klass is ignored.
+        if create_protocol is None:
+            create_protocol = klass
+
+        # Backwards compatibility: recv() used to return None on closed connections
+        legacy_recv: bool = kwargs.pop("legacy_recv", False)
+
+        # Backwards compatibility: the loop parameter used to be supported.
+        _loop: asyncio.AbstractEventLoop | None = kwargs.pop("loop", None)
+        if _loop is None:
+            loop = asyncio.get_event_loop()
+        else:
+            loop = _loop
+            warnings.warn("remove loop argument", DeprecationWarning)
+
+        ws_server = WebSocketServer(logger=logger)
+
+        secure = kwargs.get("ssl") is not None
+
+        if compression == "deflate":
+            extensions = enable_server_permessage_deflate(extensions)
+        elif compression is not None:
+            raise ValueError(f"unsupported compression: {compression}")
+
+        if subprotocols is not None:
+            validate_subprotocols(subprotocols)
+
+        # Help mypy and avoid this error: "type[WebSocketServerProtocol] |
+        # Callable[..., WebSocketServerProtocol]" not callable  [misc]
+        create_protocol = cast(Callable[..., WebSocketServerProtocol], create_protocol)
+        factory = functools.partial(
+            create_protocol,
+            # For backwards compatibility with 10.0 or earlier. Done here in
+            # addition to WebSocketServerProtocol to trigger the deprecation
+            # warning once per serve() call rather than once per connection.
+            remove_path_argument(ws_handler),
+            ws_server,
+            host=host,
+            port=port,
+            secure=secure,
+            open_timeout=open_timeout,
+            ping_interval=ping_interval,
+            ping_timeout=ping_timeout,
+            close_timeout=close_timeout,
+            max_size=max_size,
+            max_queue=max_queue,
+            read_limit=read_limit,
+            write_limit=write_limit,
+            loop=_loop,
+            legacy_recv=legacy_recv,
+            origins=origins,
+            extensions=extensions,
+            subprotocols=subprotocols,
+            extra_headers=extra_headers,
+            server_header=server_header,
+            process_request=process_request,
+            select_subprotocol=select_subprotocol,
+            logger=logger,
+        )
+
+        if kwargs.pop("unix", False):
+            path: str | None = kwargs.pop("path", None)
+            # unix_serve(path) must not specify host and port parameters.
+            assert host is None and port is None
+            create_server = functools.partial(
+                loop.create_unix_server, factory, path, **kwargs
+            )
+        else:
+            create_server = functools.partial(
+                loop.create_server, factory, host, port, **kwargs
+            )
+
+        # This is a coroutine function.
+        self._create_server = create_server
+        self.ws_server = ws_server
+
+    # async with serve(...)
+
+    async def __aenter__(self) -> WebSocketServer:
+        return await self
+
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:
+        self.ws_server.close()
+        await self.ws_server.wait_closed()
+
+    # await serve(...)
+
+    def __await__(self) -> Generator[Any, None, WebSocketServer]:
+        # Create a suitable iterator by calling __await__ on a coroutine.
+        return self.__await_impl__().__await__()
+
+    async def __await_impl__(self) -> WebSocketServer:
+        server = await self._create_server()
+        self.ws_server.wrap(server)
+        return self.ws_server
+
+    # yield from serve(...) - remove when dropping Python < 3.10
+
+    __iter__ = __await__
+
+
+serve = Serve
+
+
+def unix_serve(
+    # The version that accepts the path in the second argument is deprecated.
+    ws_handler: (
+        Callable[[WebSocketServerProtocol], Awaitable[Any]]
+        | Callable[[WebSocketServerProtocol, str], Awaitable[Any]]
+    ),
+    path: str | None = None,
+    **kwargs: Any,
+) -> Serve:
+    """
+    Start a WebSocket server listening on a Unix socket.
+
+    This function is identical to :func:`serve`, except the ``host`` and
+    ``port`` arguments are replaced by ``path``. It is only available on Unix.
+
+    Unrecognized keyword arguments are passed the event loop's
+    :meth:`~asyncio.loop.create_unix_server` method.
+
+    It's useful for deploying a server behind a reverse proxy such as nginx.
+
+    Args:
+        path: File system path to the Unix socket.
+
+    """
+    return serve(ws_handler, path=path, unix=True, **kwargs)
+
+
+def remove_path_argument(
+    ws_handler: (
+        Callable[[WebSocketServerProtocol], Awaitable[Any]]
+        | Callable[[WebSocketServerProtocol, str], Awaitable[Any]]
+    ),
+) -> Callable[[WebSocketServerProtocol], Awaitable[Any]]:
+    try:
+        inspect.signature(ws_handler).bind(None)
+    except TypeError:
+        try:
+            inspect.signature(ws_handler).bind(None, "")
+        except TypeError:  # pragma: no cover
+            # ws_handler accepts neither one nor two arguments; leave it alone.
+            pass
+        else:
+            # ws_handler accepts two arguments; activate backwards compatibility.
+            warnings.warn("remove second argument of ws_handler", DeprecationWarning)
+
+            async def _ws_handler(websocket: WebSocketServerProtocol) -> Any:
+                return await cast(
+                    Callable[[WebSocketServerProtocol, str], Awaitable[Any]],
+                    ws_handler,
+                )(websocket, websocket.path)
+
+            return _ws_handler
+
+    return cast(
+        Callable[[WebSocketServerProtocol], Awaitable[Any]],
+        ws_handler,
+    )