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Diffstat (limited to '.venv/lib/python3.12/site-packages/aiohttp/web_protocol.py')
| -rw-r--r-- | .venv/lib/python3.12/site-packages/aiohttp/web_protocol.py | 760 |
1 files changed, 760 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/aiohttp/web_protocol.py b/.venv/lib/python3.12/site-packages/aiohttp/web_protocol.py new file mode 100644 index 00000000..1dba9606 --- /dev/null +++ b/.venv/lib/python3.12/site-packages/aiohttp/web_protocol.py @@ -0,0 +1,760 @@ +import asyncio +import asyncio.streams +import sys +import traceback +import warnings +from collections import deque +from contextlib import suppress +from html import escape as html_escape +from http import HTTPStatus +from logging import Logger +from typing import ( + TYPE_CHECKING, + Any, + Awaitable, + Callable, + Deque, + Optional, + Sequence, + Tuple, + Type, + Union, + cast, +) + +import attr +import yarl + +from .abc import AbstractAccessLogger, AbstractStreamWriter +from .base_protocol import BaseProtocol +from .helpers import ceil_timeout +from .http import ( + HttpProcessingError, + HttpRequestParser, + HttpVersion10, + RawRequestMessage, + StreamWriter, +) +from .http_exceptions import BadHttpMethod +from .log import access_logger, server_logger +from .streams import EMPTY_PAYLOAD, StreamReader +from .tcp_helpers import tcp_keepalive +from .web_exceptions import HTTPException, HTTPInternalServerError +from .web_log import AccessLogger +from .web_request import BaseRequest +from .web_response import Response, StreamResponse + +__all__ = ("RequestHandler", "RequestPayloadError", "PayloadAccessError") + +if TYPE_CHECKING: + from .web_server import Server + + +_RequestFactory = Callable[ + [ + RawRequestMessage, + StreamReader, + "RequestHandler", + AbstractStreamWriter, + "asyncio.Task[None]", + ], + BaseRequest, +] + +_RequestHandler = Callable[[BaseRequest], Awaitable[StreamResponse]] + +ERROR = RawRequestMessage( + "UNKNOWN", + "/", + HttpVersion10, + {}, # type: ignore[arg-type] + {}, # type: ignore[arg-type] + True, + None, + False, + False, + yarl.URL("/"), +) + + +class RequestPayloadError(Exception): + """Payload parsing error.""" + + +class PayloadAccessError(Exception): + """Payload was accessed after response was sent.""" + + +_PAYLOAD_ACCESS_ERROR = PayloadAccessError() + + +@attr.s(auto_attribs=True, frozen=True, slots=True) +class _ErrInfo: + status: int + exc: BaseException + message: str + + +_MsgType = Tuple[Union[RawRequestMessage, _ErrInfo], StreamReader] + + +class RequestHandler(BaseProtocol): + """HTTP protocol implementation. + + RequestHandler handles incoming HTTP request. It reads request line, + request headers and request payload and calls handle_request() method. + By default it always returns with 404 response. + + RequestHandler handles errors in incoming request, like bad + status line, bad headers or incomplete payload. If any error occurs, + connection gets closed. + + keepalive_timeout -- number of seconds before closing + keep-alive connection + + tcp_keepalive -- TCP keep-alive is on, default is on + + debug -- enable debug mode + + logger -- custom logger object + + access_log_class -- custom class for access_logger + + access_log -- custom logging object + + access_log_format -- access log format string + + loop -- Optional event loop + + max_line_size -- Optional maximum header line size + + max_field_size -- Optional maximum header field size + + max_headers -- Optional maximum header size + + timeout_ceil_threshold -- Optional value to specify + threshold to ceil() timeout + values + + """ + + __slots__ = ( + "_request_count", + "_keepalive", + "_manager", + "_request_handler", + "_request_factory", + "_tcp_keepalive", + "_next_keepalive_close_time", + "_keepalive_handle", + "_keepalive_timeout", + "_lingering_time", + "_messages", + "_message_tail", + "_handler_waiter", + "_waiter", + "_task_handler", + "_upgrade", + "_payload_parser", + "_request_parser", + "_reading_paused", + "logger", + "debug", + "access_log", + "access_logger", + "_close", + "_force_close", + "_current_request", + "_timeout_ceil_threshold", + "_request_in_progress", + ) + + def __init__( + self, + manager: "Server", + *, + loop: asyncio.AbstractEventLoop, + # Default should be high enough that it's likely longer than a reverse proxy. + keepalive_timeout: float = 3630, + tcp_keepalive: bool = True, + logger: Logger = server_logger, + access_log_class: Type[AbstractAccessLogger] = AccessLogger, + access_log: Logger = access_logger, + access_log_format: str = AccessLogger.LOG_FORMAT, + debug: bool = False, + max_line_size: int = 8190, + max_headers: int = 32768, + max_field_size: int = 8190, + lingering_time: float = 10.0, + read_bufsize: int = 2**16, + auto_decompress: bool = True, + timeout_ceil_threshold: float = 5, + ): + super().__init__(loop) + + # _request_count is the number of requests processed with the same connection. + self._request_count = 0 + self._keepalive = False + self._current_request: Optional[BaseRequest] = None + self._manager: Optional[Server] = manager + self._request_handler: Optional[_RequestHandler] = manager.request_handler + self._request_factory: Optional[_RequestFactory] = manager.request_factory + + self._tcp_keepalive = tcp_keepalive + # placeholder to be replaced on keepalive timeout setup + self._next_keepalive_close_time = 0.0 + self._keepalive_handle: Optional[asyncio.Handle] = None + self._keepalive_timeout = keepalive_timeout + self._lingering_time = float(lingering_time) + + self._messages: Deque[_MsgType] = deque() + self._message_tail = b"" + + self._waiter: Optional[asyncio.Future[None]] = None + self._handler_waiter: Optional[asyncio.Future[None]] = None + self._task_handler: Optional[asyncio.Task[None]] = None + + self._upgrade = False + self._payload_parser: Any = None + self._request_parser: Optional[HttpRequestParser] = HttpRequestParser( + self, + loop, + read_bufsize, + max_line_size=max_line_size, + max_field_size=max_field_size, + max_headers=max_headers, + payload_exception=RequestPayloadError, + auto_decompress=auto_decompress, + ) + + self._timeout_ceil_threshold: float = 5 + try: + self._timeout_ceil_threshold = float(timeout_ceil_threshold) + except (TypeError, ValueError): + pass + + self.logger = logger + self.debug = debug + self.access_log = access_log + if access_log: + self.access_logger: Optional[AbstractAccessLogger] = access_log_class( + access_log, access_log_format + ) + else: + self.access_logger = None + + self._close = False + self._force_close = False + self._request_in_progress = False + + def __repr__(self) -> str: + return "<{} {}>".format( + self.__class__.__name__, + "connected" if self.transport is not None else "disconnected", + ) + + @property + def keepalive_timeout(self) -> float: + return self._keepalive_timeout + + async def shutdown(self, timeout: Optional[float] = 15.0) -> None: + """Do worker process exit preparations. + + We need to clean up everything and stop accepting requests. + It is especially important for keep-alive connections. + """ + self._force_close = True + + if self._keepalive_handle is not None: + self._keepalive_handle.cancel() + + # Wait for graceful handler completion + if self._request_in_progress: + # The future is only created when we are shutting + # down while the handler is still processing a request + # to avoid creating a future for every request. + self._handler_waiter = self._loop.create_future() + try: + async with ceil_timeout(timeout): + await self._handler_waiter + except (asyncio.CancelledError, asyncio.TimeoutError): + self._handler_waiter = None + if ( + sys.version_info >= (3, 11) + and (task := asyncio.current_task()) + and task.cancelling() + ): + raise + # Then cancel handler and wait + try: + async with ceil_timeout(timeout): + if self._current_request is not None: + self._current_request._cancel(asyncio.CancelledError()) + + if self._task_handler is not None and not self._task_handler.done(): + await asyncio.shield(self._task_handler) + except (asyncio.CancelledError, asyncio.TimeoutError): + if ( + sys.version_info >= (3, 11) + and (task := asyncio.current_task()) + and task.cancelling() + ): + raise + + # force-close non-idle handler + if self._task_handler is not None: + self._task_handler.cancel() + + self.force_close() + + def connection_made(self, transport: asyncio.BaseTransport) -> None: + super().connection_made(transport) + + real_transport = cast(asyncio.Transport, transport) + if self._tcp_keepalive: + tcp_keepalive(real_transport) + + assert self._manager is not None + self._manager.connection_made(self, real_transport) + + loop = self._loop + if sys.version_info >= (3, 12): + task = asyncio.Task(self.start(), loop=loop, eager_start=True) + else: + task = loop.create_task(self.start()) + self._task_handler = task + + def connection_lost(self, exc: Optional[BaseException]) -> None: + if self._manager is None: + return + self._manager.connection_lost(self, exc) + + # Grab value before setting _manager to None. + handler_cancellation = self._manager.handler_cancellation + + self.force_close() + super().connection_lost(exc) + self._manager = None + self._request_factory = None + self._request_handler = None + self._request_parser = None + + if self._keepalive_handle is not None: + self._keepalive_handle.cancel() + + if self._current_request is not None: + if exc is None: + exc = ConnectionResetError("Connection lost") + self._current_request._cancel(exc) + + if handler_cancellation and self._task_handler is not None: + self._task_handler.cancel() + + self._task_handler = None + + if self._payload_parser is not None: + self._payload_parser.feed_eof() + self._payload_parser = None + + def set_parser(self, parser: Any) -> None: + # Actual type is WebReader + assert self._payload_parser is None + + self._payload_parser = parser + + if self._message_tail: + self._payload_parser.feed_data(self._message_tail) + self._message_tail = b"" + + def eof_received(self) -> None: + pass + + def data_received(self, data: bytes) -> None: + if self._force_close or self._close: + return + # parse http messages + messages: Sequence[_MsgType] + if self._payload_parser is None and not self._upgrade: + assert self._request_parser is not None + try: + messages, upgraded, tail = self._request_parser.feed_data(data) + except HttpProcessingError as exc: + messages = [ + (_ErrInfo(status=400, exc=exc, message=exc.message), EMPTY_PAYLOAD) + ] + upgraded = False + tail = b"" + + for msg, payload in messages or (): + self._request_count += 1 + self._messages.append((msg, payload)) + + waiter = self._waiter + if messages and waiter is not None and not waiter.done(): + # don't set result twice + waiter.set_result(None) + + self._upgrade = upgraded + if upgraded and tail: + self._message_tail = tail + + # no parser, just store + elif self._payload_parser is None and self._upgrade and data: + self._message_tail += data + + # feed payload + elif data: + eof, tail = self._payload_parser.feed_data(data) + if eof: + self.close() + + def keep_alive(self, val: bool) -> None: + """Set keep-alive connection mode. + + :param bool val: new state. + """ + self._keepalive = val + if self._keepalive_handle: + self._keepalive_handle.cancel() + self._keepalive_handle = None + + def close(self) -> None: + """Close connection. + + Stop accepting new pipelining messages and close + connection when handlers done processing messages. + """ + self._close = True + if self._waiter: + self._waiter.cancel() + + def force_close(self) -> None: + """Forcefully close connection.""" + self._force_close = True + if self._waiter: + self._waiter.cancel() + if self.transport is not None: + self.transport.close() + self.transport = None + + def log_access( + self, request: BaseRequest, response: StreamResponse, time: float + ) -> None: + if self.access_logger is not None and self.access_logger.enabled: + self.access_logger.log(request, response, self._loop.time() - time) + + def log_debug(self, *args: Any, **kw: Any) -> None: + if self.debug: + self.logger.debug(*args, **kw) + + def log_exception(self, *args: Any, **kw: Any) -> None: + self.logger.exception(*args, **kw) + + def _process_keepalive(self) -> None: + self._keepalive_handle = None + if self._force_close or not self._keepalive: + return + + loop = self._loop + now = loop.time() + close_time = self._next_keepalive_close_time + if now < close_time: + # Keep alive close check fired too early, reschedule + self._keepalive_handle = loop.call_at(close_time, self._process_keepalive) + return + + # handler in idle state + if self._waiter and not self._waiter.done(): + self.force_close() + + async def _handle_request( + self, + request: BaseRequest, + start_time: float, + request_handler: Callable[[BaseRequest], Awaitable[StreamResponse]], + ) -> Tuple[StreamResponse, bool]: + self._request_in_progress = True + try: + try: + self._current_request = request + resp = await request_handler(request) + finally: + self._current_request = None + except HTTPException as exc: + resp = exc + resp, reset = await self.finish_response(request, resp, start_time) + except asyncio.CancelledError: + raise + except asyncio.TimeoutError as exc: + self.log_debug("Request handler timed out.", exc_info=exc) + resp = self.handle_error(request, 504) + resp, reset = await self.finish_response(request, resp, start_time) + except Exception as exc: + resp = self.handle_error(request, 500, exc) + resp, reset = await self.finish_response(request, resp, start_time) + else: + # Deprecation warning (See #2415) + if getattr(resp, "__http_exception__", False): + warnings.warn( + "returning HTTPException object is deprecated " + "(#2415) and will be removed, " + "please raise the exception instead", + DeprecationWarning, + ) + + resp, reset = await self.finish_response(request, resp, start_time) + finally: + self._request_in_progress = False + if self._handler_waiter is not None: + self._handler_waiter.set_result(None) + + return resp, reset + + async def start(self) -> None: + """Process incoming request. + + It reads request line, request headers and request payload, then + calls handle_request() method. Subclass has to override + handle_request(). start() handles various exceptions in request + or response handling. Connection is being closed always unless + keep_alive(True) specified. + """ + loop = self._loop + manager = self._manager + assert manager is not None + keepalive_timeout = self._keepalive_timeout + resp = None + assert self._request_factory is not None + assert self._request_handler is not None + + while not self._force_close: + if not self._messages: + try: + # wait for next request + self._waiter = loop.create_future() + await self._waiter + finally: + self._waiter = None + + message, payload = self._messages.popleft() + + start = loop.time() + + manager.requests_count += 1 + writer = StreamWriter(self, loop) + if isinstance(message, _ErrInfo): + # make request_factory work + request_handler = self._make_error_handler(message) + message = ERROR + else: + request_handler = self._request_handler + + # Important don't hold a reference to the current task + # as on traceback it will prevent the task from being + # collected and will cause a memory leak. + request = self._request_factory( + message, + payload, + self, + writer, + self._task_handler or asyncio.current_task(loop), # type: ignore[arg-type] + ) + try: + # a new task is used for copy context vars (#3406) + coro = self._handle_request(request, start, request_handler) + if sys.version_info >= (3, 12): + task = asyncio.Task(coro, loop=loop, eager_start=True) + else: + task = loop.create_task(coro) + try: + resp, reset = await task + except ConnectionError: + self.log_debug("Ignored premature client disconnection") + break + + # Drop the processed task from asyncio.Task.all_tasks() early + del task + if reset: + self.log_debug("Ignored premature client disconnection 2") + break + + # notify server about keep-alive + self._keepalive = bool(resp.keep_alive) + + # check payload + if not payload.is_eof(): + lingering_time = self._lingering_time + if not self._force_close and lingering_time: + self.log_debug( + "Start lingering close timer for %s sec.", lingering_time + ) + + now = loop.time() + end_t = now + lingering_time + + try: + while not payload.is_eof() and now < end_t: + async with ceil_timeout(end_t - now): + # read and ignore + await payload.readany() + now = loop.time() + except (asyncio.CancelledError, asyncio.TimeoutError): + if ( + sys.version_info >= (3, 11) + and (t := asyncio.current_task()) + and t.cancelling() + ): + raise + + # if payload still uncompleted + if not payload.is_eof() and not self._force_close: + self.log_debug("Uncompleted request.") + self.close() + + payload.set_exception(_PAYLOAD_ACCESS_ERROR) + + except asyncio.CancelledError: + self.log_debug("Ignored premature client disconnection") + self.force_close() + raise + except Exception as exc: + self.log_exception("Unhandled exception", exc_info=exc) + self.force_close() + except BaseException: + self.force_close() + raise + finally: + request._task = None # type: ignore[assignment] # Break reference cycle in case of exception + if self.transport is None and resp is not None: + self.log_debug("Ignored premature client disconnection.") + + if self._keepalive and not self._close and not self._force_close: + # start keep-alive timer + close_time = loop.time() + keepalive_timeout + self._next_keepalive_close_time = close_time + if self._keepalive_handle is None: + self._keepalive_handle = loop.call_at( + close_time, self._process_keepalive + ) + else: + break + + # remove handler, close transport if no handlers left + if not self._force_close: + self._task_handler = None + if self.transport is not None: + self.transport.close() + + async def finish_response( + self, request: BaseRequest, resp: StreamResponse, start_time: float + ) -> Tuple[StreamResponse, bool]: + """Prepare the response and write_eof, then log access. + + This has to + be called within the context of any exception so the access logger + can get exception information. Returns True if the client disconnects + prematurely. + """ + request._finish() + if self._request_parser is not None: + self._request_parser.set_upgraded(False) + self._upgrade = False + if self._message_tail: + self._request_parser.feed_data(self._message_tail) + self._message_tail = b"" + try: + prepare_meth = resp.prepare + except AttributeError: + if resp is None: + self.log_exception("Missing return statement on request handler") + else: + self.log_exception( + "Web-handler should return a response instance, " + "got {!r}".format(resp) + ) + exc = HTTPInternalServerError() + resp = Response( + status=exc.status, reason=exc.reason, text=exc.text, headers=exc.headers + ) + prepare_meth = resp.prepare + try: + await prepare_meth(request) + await resp.write_eof() + except ConnectionError: + self.log_access(request, resp, start_time) + return resp, True + + self.log_access(request, resp, start_time) + return resp, False + + def handle_error( + self, + request: BaseRequest, + status: int = 500, + exc: Optional[BaseException] = None, + message: Optional[str] = None, + ) -> StreamResponse: + """Handle errors. + + Returns HTTP response with specific status code. Logs additional + information. It always closes current connection. + """ + if self._request_count == 1 and isinstance(exc, BadHttpMethod): + # BadHttpMethod is common when a client sends non-HTTP + # or encrypted traffic to an HTTP port. This is expected + # to happen when connected to the public internet so we log + # it at the debug level as to not fill logs with noise. + self.logger.debug( + "Error handling request from %s", request.remote, exc_info=exc + ) + else: + self.log_exception( + "Error handling request from %s", request.remote, exc_info=exc + ) + + # some data already got sent, connection is broken + if request.writer.output_size > 0: + raise ConnectionError( + "Response is sent already, cannot send another response " + "with the error message" + ) + + ct = "text/plain" + if status == HTTPStatus.INTERNAL_SERVER_ERROR: + title = "{0.value} {0.phrase}".format(HTTPStatus.INTERNAL_SERVER_ERROR) + msg = HTTPStatus.INTERNAL_SERVER_ERROR.description + tb = None + if self.debug: + with suppress(Exception): + tb = traceback.format_exc() + + if "text/html" in request.headers.get("Accept", ""): + if tb: + tb = html_escape(tb) + msg = f"<h2>Traceback:</h2>\n<pre>{tb}</pre>" + message = ( + "<html><head>" + "<title>{title}</title>" + "</head><body>\n<h1>{title}</h1>" + "\n{msg}\n</body></html>\n" + ).format(title=title, msg=msg) + ct = "text/html" + else: + if tb: + msg = tb + message = title + "\n\n" + msg + + resp = Response(status=status, text=message, content_type=ct) + resp.force_close() + + return resp + + def _make_error_handler( + self, err_info: _ErrInfo + ) -> Callable[[BaseRequest], Awaitable[StreamResponse]]: + async def handler(request: BaseRequest) -> StreamResponse: + return self.handle_error( + request, err_info.status, err_info.exc, err_info.message + ) + + return handler |