diff options
Diffstat (limited to '.venv/lib/python3.12/site-packages/uvicorn/protocols/http')
5 files changed, 1229 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/__init__.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/__init__.py new file mode 100644 index 00000000..e69de29b --- /dev/null +++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/__init__.py diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/auto.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/auto.py new file mode 100644 index 00000000..a14bec14 --- /dev/null +++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/auto.py @@ -0,0 +1,15 @@ +from __future__ import annotations + +import asyncio + +AutoHTTPProtocol: type[asyncio.Protocol] +try: + import httptools # noqa +except ImportError: # pragma: no cover + from uvicorn.protocols.http.h11_impl import H11Protocol + + AutoHTTPProtocol = H11Protocol +else: # pragma: no cover + from uvicorn.protocols.http.httptools_impl import HttpToolsProtocol + + AutoHTTPProtocol = HttpToolsProtocol diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py new file mode 100644 index 00000000..df642c7b --- /dev/null +++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/flow_control.py @@ -0,0 +1,66 @@ +import asyncio + +from uvicorn._types import ( + ASGIReceiveCallable, + ASGISendCallable, + HTTPResponseBodyEvent, + HTTPResponseStartEvent, + Scope, +) + +CLOSE_HEADER = (b"connection", b"close") + +HIGH_WATER_LIMIT = 65536 + + +class FlowControl: + def __init__(self, transport: asyncio.Transport) -> None: + self._transport = transport + self.read_paused = False + self.write_paused = False + self._is_writable_event = asyncio.Event() + self._is_writable_event.set() + + async def drain(self) -> None: + await self._is_writable_event.wait() + + def pause_reading(self) -> None: + if not self.read_paused: + self.read_paused = True + self._transport.pause_reading() + + def resume_reading(self) -> None: + if self.read_paused: + self.read_paused = False + self._transport.resume_reading() + + def pause_writing(self) -> None: + if not self.write_paused: + self.write_paused = True + self._is_writable_event.clear() + + def resume_writing(self) -> None: + if self.write_paused: + self.write_paused = False + self._is_writable_event.set() + + +async def service_unavailable( + scope: "Scope", receive: "ASGIReceiveCallable", send: "ASGISendCallable" +) -> None: + response_start: "HTTPResponseStartEvent" = { + "type": "http.response.start", + "status": 503, + "headers": [ + (b"content-type", b"text/plain; charset=utf-8"), + (b"connection", b"close"), + ], + } + await send(response_start) + + response_body: "HTTPResponseBodyEvent" = { + "type": "http.response.body", + "body": b"Service Unavailable", + "more_body": False, + } + await send(response_body) diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/h11_impl.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/h11_impl.py new file mode 100644 index 00000000..4922d178 --- /dev/null +++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/h11_impl.py @@ -0,0 +1,554 @@ +from __future__ import annotations + +import asyncio +import http +import logging +from typing import Any, Callable, Literal, cast +from urllib.parse import unquote + +import h11 +from h11._connection import DEFAULT_MAX_INCOMPLETE_EVENT_SIZE + +from uvicorn._types import ( + ASGI3Application, + ASGIReceiveEvent, + ASGISendEvent, + HTTPRequestEvent, + HTTPResponseBodyEvent, + HTTPResponseStartEvent, + HTTPScope, +) +from uvicorn.config import Config +from uvicorn.logging import TRACE_LOG_LEVEL +from uvicorn.protocols.http.flow_control import ( + CLOSE_HEADER, + HIGH_WATER_LIMIT, + FlowControl, + service_unavailable, +) +from uvicorn.protocols.utils import ( + get_client_addr, + get_local_addr, + get_path_with_query_string, + get_remote_addr, + is_ssl, +) +from uvicorn.server import ServerState + + +def _get_status_phrase(status_code: int) -> bytes: + try: + return http.HTTPStatus(status_code).phrase.encode() + except ValueError: + return b"" + + +STATUS_PHRASES = { + status_code: _get_status_phrase(status_code) for status_code in range(100, 600) +} + + +class H11Protocol(asyncio.Protocol): + def __init__( + self, + config: Config, + server_state: ServerState, + app_state: dict[str, Any], + _loop: asyncio.AbstractEventLoop | None = None, + ) -> None: + if not config.loaded: + config.load() + + self.config = config + self.app = config.loaded_app + self.loop = _loop or asyncio.get_event_loop() + self.logger = logging.getLogger("uvicorn.error") + self.access_logger = logging.getLogger("uvicorn.access") + self.access_log = self.access_logger.hasHandlers() + self.conn = h11.Connection( + h11.SERVER, + config.h11_max_incomplete_event_size + if config.h11_max_incomplete_event_size is not None + else DEFAULT_MAX_INCOMPLETE_EVENT_SIZE, + ) + self.ws_protocol_class = config.ws_protocol_class + self.root_path = config.root_path + self.limit_concurrency = config.limit_concurrency + self.app_state = app_state + + # Timeouts + self.timeout_keep_alive_task: asyncio.TimerHandle | None = None + self.timeout_keep_alive = config.timeout_keep_alive + + # Shared server state + self.server_state = server_state + self.connections = server_state.connections + self.tasks = server_state.tasks + + # Per-connection state + self.transport: asyncio.Transport = None # type: ignore[assignment] + self.flow: FlowControl = None # type: ignore[assignment] + self.server: tuple[str, int] | None = None + self.client: tuple[str, int] | None = None + self.scheme: Literal["http", "https"] | None = None + + # Per-request state + self.scope: HTTPScope = None # type: ignore[assignment] + self.headers: list[tuple[bytes, bytes]] = None # type: ignore[assignment] + self.cycle: RequestResponseCycle = None # type: ignore[assignment] + + # Protocol interface + def connection_made( # type: ignore[override] + self, transport: asyncio.Transport + ) -> None: + self.connections.add(self) + + self.transport = transport + self.flow = FlowControl(transport) + self.server = get_local_addr(transport) + self.client = get_remote_addr(transport) + self.scheme = "https" if is_ssl(transport) else "http" + + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sHTTP connection made", prefix) + + def connection_lost(self, exc: Exception | None) -> None: + self.connections.discard(self) + + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sHTTP connection lost", prefix) + + if self.cycle and not self.cycle.response_complete: + self.cycle.disconnected = True + if self.conn.our_state != h11.ERROR: + event = h11.ConnectionClosed() + try: + self.conn.send(event) + except h11.LocalProtocolError: + # Premature client disconnect + pass + + if self.cycle is not None: + self.cycle.message_event.set() + if self.flow is not None: + self.flow.resume_writing() + if exc is None: + self.transport.close() + self._unset_keepalive_if_required() + + def eof_received(self) -> None: + pass + + def _unset_keepalive_if_required(self) -> None: + if self.timeout_keep_alive_task is not None: + self.timeout_keep_alive_task.cancel() + self.timeout_keep_alive_task = None + + def _get_upgrade(self) -> bytes | None: + connection = [] + upgrade = None + for name, value in self.headers: + if name == b"connection": + connection = [token.lower().strip() for token in value.split(b",")] + if name == b"upgrade": + upgrade = value.lower() + if b"upgrade" in connection: + return upgrade + return None + + def _should_upgrade_to_ws(self) -> bool: + if self.ws_protocol_class is None: + if self.config.ws == "auto": + msg = "Unsupported upgrade request." + self.logger.warning(msg) + msg = "No supported WebSocket library detected. Please use \"pip install 'uvicorn[standard]'\", or install 'websockets' or 'wsproto' manually." # noqa: E501 + self.logger.warning(msg) + return False + return True + + def data_received(self, data: bytes) -> None: + self._unset_keepalive_if_required() + + self.conn.receive_data(data) + self.handle_events() + + def handle_events(self) -> None: + while True: + try: + event = self.conn.next_event() + except h11.RemoteProtocolError: + msg = "Invalid HTTP request received." + self.logger.warning(msg) + self.send_400_response(msg) + return + + if event is h11.NEED_DATA: + break + + elif event is h11.PAUSED: + # This case can occur in HTTP pipelining, so we need to + # stop reading any more data, and ensure that at the end + # of the active request/response cycle we handle any + # events that have been buffered up. + self.flow.pause_reading() + break + + elif isinstance(event, h11.Request): + self.headers = [(key.lower(), value) for key, value in event.headers] + raw_path, _, query_string = event.target.partition(b"?") + path = unquote(raw_path.decode("ascii")) + full_path = self.root_path + path + full_raw_path = self.root_path.encode("ascii") + raw_path + self.scope = { + "type": "http", + "asgi": { + "version": self.config.asgi_version, + "spec_version": "2.3", + }, + "http_version": event.http_version.decode("ascii"), + "server": self.server, + "client": self.client, + "scheme": self.scheme, # type: ignore[typeddict-item] + "method": event.method.decode("ascii"), + "root_path": self.root_path, + "path": full_path, + "raw_path": full_raw_path, + "query_string": query_string, + "headers": self.headers, + "state": self.app_state.copy(), + } + + upgrade = self._get_upgrade() + if upgrade == b"websocket" and self._should_upgrade_to_ws(): + self.handle_websocket_upgrade(event) + return + + # Handle 503 responses when 'limit_concurrency' is exceeded. + if self.limit_concurrency is not None and ( + len(self.connections) >= self.limit_concurrency + or len(self.tasks) >= self.limit_concurrency + ): + app = service_unavailable + message = "Exceeded concurrency limit." + self.logger.warning(message) + else: + app = self.app + + # When starting to process a request, disable the keep-alive + # timeout. Normally we disable this when receiving data from + # client and set back when finishing processing its request. + # However, for pipelined requests processing finishes after + # already receiving the next request and thus the timer may + # be set here, which we don't want. + self._unset_keepalive_if_required() + + self.cycle = RequestResponseCycle( + scope=self.scope, + conn=self.conn, + transport=self.transport, + flow=self.flow, + logger=self.logger, + access_logger=self.access_logger, + access_log=self.access_log, + default_headers=self.server_state.default_headers, + message_event=asyncio.Event(), + on_response=self.on_response_complete, + ) + task = self.loop.create_task(self.cycle.run_asgi(app)) + task.add_done_callback(self.tasks.discard) + self.tasks.add(task) + + elif isinstance(event, h11.Data): + if self.conn.our_state is h11.DONE: + continue + self.cycle.body += event.data + if len(self.cycle.body) > HIGH_WATER_LIMIT: + self.flow.pause_reading() + self.cycle.message_event.set() + + elif isinstance(event, h11.EndOfMessage): + if self.conn.our_state is h11.DONE: + self.transport.resume_reading() + self.conn.start_next_cycle() + continue + self.cycle.more_body = False + self.cycle.message_event.set() + + def handle_websocket_upgrade(self, event: h11.Request) -> None: + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sUpgrading to WebSocket", prefix) + + self.connections.discard(self) + output = [event.method, b" ", event.target, b" HTTP/1.1\r\n"] + for name, value in self.headers: + output += [name, b": ", value, b"\r\n"] + output.append(b"\r\n") + protocol = self.ws_protocol_class( # type: ignore[call-arg, misc] + config=self.config, + server_state=self.server_state, + app_state=self.app_state, + ) + protocol.connection_made(self.transport) + protocol.data_received(b"".join(output)) + self.transport.set_protocol(protocol) + + def send_400_response(self, msg: str) -> None: + reason = STATUS_PHRASES[400] + headers: list[tuple[bytes, bytes]] = [ + (b"content-type", b"text/plain; charset=utf-8"), + (b"connection", b"close"), + ] + event = h11.Response(status_code=400, headers=headers, reason=reason) + output = self.conn.send(event) + self.transport.write(output) + + output = self.conn.send(event=h11.Data(data=msg.encode("ascii"))) + self.transport.write(output) + + output = self.conn.send(event=h11.EndOfMessage()) + self.transport.write(output) + + self.transport.close() + + def on_response_complete(self) -> None: + self.server_state.total_requests += 1 + + if self.transport.is_closing(): + return + + # Set a short Keep-Alive timeout. + self._unset_keepalive_if_required() + + self.timeout_keep_alive_task = self.loop.call_later( + self.timeout_keep_alive, self.timeout_keep_alive_handler + ) + + # Unpause data reads if needed. + self.flow.resume_reading() + + # Unblock any pipelined events. + if self.conn.our_state is h11.DONE and self.conn.their_state is h11.DONE: + self.conn.start_next_cycle() + self.handle_events() + + def shutdown(self) -> None: + """ + Called by the server to commence a graceful shutdown. + """ + if self.cycle is None or self.cycle.response_complete: + event = h11.ConnectionClosed() + self.conn.send(event) + self.transport.close() + else: + self.cycle.keep_alive = False + + def pause_writing(self) -> None: + """ + Called by the transport when the write buffer exceeds the high water mark. + """ + self.flow.pause_writing() + + def resume_writing(self) -> None: + """ + Called by the transport when the write buffer drops below the low water mark. + """ + self.flow.resume_writing() + + def timeout_keep_alive_handler(self) -> None: + """ + Called on a keep-alive connection if no new data is received after a short + delay. + """ + if not self.transport.is_closing(): + event = h11.ConnectionClosed() + self.conn.send(event) + self.transport.close() + + +class RequestResponseCycle: + def __init__( + self, + scope: "HTTPScope", + conn: h11.Connection, + transport: asyncio.Transport, + flow: FlowControl, + logger: logging.Logger, + access_logger: logging.Logger, + access_log: bool, + default_headers: list[tuple[bytes, bytes]], + message_event: asyncio.Event, + on_response: Callable[..., None], + ) -> None: + self.scope = scope + self.conn = conn + self.transport = transport + self.flow = flow + self.logger = logger + self.access_logger = access_logger + self.access_log = access_log + self.default_headers = default_headers + self.message_event = message_event + self.on_response = on_response + + # Connection state + self.disconnected = False + self.keep_alive = True + self.waiting_for_100_continue = conn.they_are_waiting_for_100_continue + + # Request state + self.body = b"" + self.more_body = True + + # Response state + self.response_started = False + self.response_complete = False + + # ASGI exception wrapper + async def run_asgi(self, app: "ASGI3Application") -> None: + try: + result = await app( # type: ignore[func-returns-value] + self.scope, self.receive, self.send + ) + except BaseException as exc: + msg = "Exception in ASGI application\n" + self.logger.error(msg, exc_info=exc) + if not self.response_started: + await self.send_500_response() + else: + self.transport.close() + else: + if result is not None: + msg = "ASGI callable should return None, but returned '%s'." + self.logger.error(msg, result) + self.transport.close() + elif not self.response_started and not self.disconnected: + msg = "ASGI callable returned without starting response." + self.logger.error(msg) + await self.send_500_response() + elif not self.response_complete and not self.disconnected: + msg = "ASGI callable returned without completing response." + self.logger.error(msg) + self.transport.close() + finally: + self.on_response = lambda: None + + async def send_500_response(self) -> None: + response_start_event: "HTTPResponseStartEvent" = { + "type": "http.response.start", + "status": 500, + "headers": [ + (b"content-type", b"text/plain; charset=utf-8"), + (b"connection", b"close"), + ], + } + await self.send(response_start_event) + response_body_event: "HTTPResponseBodyEvent" = { + "type": "http.response.body", + "body": b"Internal Server Error", + "more_body": False, + } + await self.send(response_body_event) + + # ASGI interface + async def send(self, message: "ASGISendEvent") -> None: + message_type = message["type"] + + if self.flow.write_paused and not self.disconnected: + await self.flow.drain() + + if self.disconnected: + return + + if not self.response_started: + # Sending response status line and headers + if message_type != "http.response.start": + msg = "Expected ASGI message 'http.response.start', but got '%s'." + raise RuntimeError(msg % message_type) + message = cast("HTTPResponseStartEvent", message) + + self.response_started = True + self.waiting_for_100_continue = False + + status = message["status"] + headers = self.default_headers + list(message.get("headers", [])) + + if CLOSE_HEADER in self.scope["headers"] and CLOSE_HEADER not in headers: + headers = headers + [CLOSE_HEADER] + + if self.access_log: + self.access_logger.info( + '%s - "%s %s HTTP/%s" %d', + get_client_addr(self.scope), + self.scope["method"], + get_path_with_query_string(self.scope), + self.scope["http_version"], + status, + ) + + # Write response status line and headers + reason = STATUS_PHRASES[status] + response = h11.Response(status_code=status, headers=headers, reason=reason) + output = self.conn.send(event=response) + self.transport.write(output) + + elif not self.response_complete: + # Sending response body + if message_type != "http.response.body": + msg = "Expected ASGI message 'http.response.body', but got '%s'." + raise RuntimeError(msg % message_type) + message = cast("HTTPResponseBodyEvent", message) + + body = message.get("body", b"") + more_body = message.get("more_body", False) + + # Write response body + data = b"" if self.scope["method"] == "HEAD" else body + output = self.conn.send(event=h11.Data(data=data)) + self.transport.write(output) + + # Handle response completion + if not more_body: + self.response_complete = True + self.message_event.set() + output = self.conn.send(event=h11.EndOfMessage()) + self.transport.write(output) + + else: + # Response already sent + msg = "Unexpected ASGI message '%s' sent, after response already completed." + raise RuntimeError(msg % message_type) + + if self.response_complete: + if self.conn.our_state is h11.MUST_CLOSE or not self.keep_alive: + self.conn.send(event=h11.ConnectionClosed()) + self.transport.close() + self.on_response() + + async def receive(self) -> "ASGIReceiveEvent": + if self.waiting_for_100_continue and not self.transport.is_closing(): + headers: list[tuple[str, str]] = [] + event = h11.InformationalResponse( + status_code=100, headers=headers, reason="Continue" + ) + output = self.conn.send(event=event) + self.transport.write(output) + self.waiting_for_100_continue = False + + if not self.disconnected and not self.response_complete: + self.flow.resume_reading() + await self.message_event.wait() + self.message_event.clear() + + if self.disconnected or self.response_complete: + return {"type": "http.disconnect"} + + message: "HTTPRequestEvent" = { + "type": "http.request", + "body": self.body, + "more_body": self.more_body, + } + self.body = b"" + return message diff --git a/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py new file mode 100644 index 00000000..e203745b --- /dev/null +++ b/.venv/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py @@ -0,0 +1,594 @@ +from __future__ import annotations + +import asyncio +import http +import logging +import re +import urllib +from asyncio.events import TimerHandle +from collections import deque +from typing import Any, Callable, Deque, Literal, cast + +import httptools + +from uvicorn._types import ( + ASGI3Application, + ASGIReceiveEvent, + ASGISendEvent, + HTTPDisconnectEvent, + HTTPRequestEvent, + HTTPResponseBodyEvent, + HTTPResponseStartEvent, + HTTPScope, +) +from uvicorn.config import Config +from uvicorn.logging import TRACE_LOG_LEVEL +from uvicorn.protocols.http.flow_control import ( + CLOSE_HEADER, + HIGH_WATER_LIMIT, + FlowControl, + service_unavailable, +) +from uvicorn.protocols.utils import ( + get_client_addr, + get_local_addr, + get_path_with_query_string, + get_remote_addr, + is_ssl, +) +from uvicorn.server import ServerState + +HEADER_RE = re.compile(b'[\x00-\x1F\x7F()<>@,;:[]={} \t\\"]') +HEADER_VALUE_RE = re.compile(b"[\x00-\x1F\x7F]") + + +def _get_status_line(status_code: int) -> bytes: + try: + phrase = http.HTTPStatus(status_code).phrase.encode() + except ValueError: + phrase = b"" + return b"".join([b"HTTP/1.1 ", str(status_code).encode(), b" ", phrase, b"\r\n"]) + + +STATUS_LINE = { + status_code: _get_status_line(status_code) for status_code in range(100, 600) +} + + +class HttpToolsProtocol(asyncio.Protocol): + def __init__( + self, + config: Config, + server_state: ServerState, + app_state: dict[str, Any], + _loop: asyncio.AbstractEventLoop | None = None, + ) -> None: + if not config.loaded: + config.load() + + self.config = config + self.app = config.loaded_app + self.loop = _loop or asyncio.get_event_loop() + self.logger = logging.getLogger("uvicorn.error") + self.access_logger = logging.getLogger("uvicorn.access") + self.access_log = self.access_logger.hasHandlers() + self.parser = httptools.HttpRequestParser(self) + self.ws_protocol_class = config.ws_protocol_class + self.root_path = config.root_path + self.limit_concurrency = config.limit_concurrency + self.app_state = app_state + + # Timeouts + self.timeout_keep_alive_task: TimerHandle | None = None + self.timeout_keep_alive = config.timeout_keep_alive + + # Global state + self.server_state = server_state + self.connections = server_state.connections + self.tasks = server_state.tasks + + # Per-connection state + self.transport: asyncio.Transport = None # type: ignore[assignment] + self.flow: FlowControl = None # type: ignore[assignment] + self.server: tuple[str, int] | None = None + self.client: tuple[str, int] | None = None + self.scheme: Literal["http", "https"] | None = None + self.pipeline: Deque[tuple[RequestResponseCycle, ASGI3Application]] = deque() + + # Per-request state + self.scope: HTTPScope = None # type: ignore[assignment] + self.headers: list[tuple[bytes, bytes]] = None # type: ignore[assignment] + self.expect_100_continue = False + self.cycle: RequestResponseCycle = None # type: ignore[assignment] + + # Protocol interface + def connection_made( # type: ignore[override] + self, transport: asyncio.Transport + ) -> None: + self.connections.add(self) + + self.transport = transport + self.flow = FlowControl(transport) + self.server = get_local_addr(transport) + self.client = get_remote_addr(transport) + self.scheme = "https" if is_ssl(transport) else "http" + + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sHTTP connection made", prefix) + + def connection_lost(self, exc: Exception | None) -> None: + self.connections.discard(self) + + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sHTTP connection lost", prefix) + + if self.cycle and not self.cycle.response_complete: + self.cycle.disconnected = True + if self.cycle is not None: + self.cycle.message_event.set() + if self.flow is not None: + self.flow.resume_writing() + if exc is None: + self.transport.close() + self._unset_keepalive_if_required() + + self.parser = None + + def eof_received(self) -> None: + pass + + def _unset_keepalive_if_required(self) -> None: + if self.timeout_keep_alive_task is not None: + self.timeout_keep_alive_task.cancel() + self.timeout_keep_alive_task = None + + def _get_upgrade(self) -> bytes | None: + connection = [] + upgrade = None + for name, value in self.headers: + if name == b"connection": + connection = [token.lower().strip() for token in value.split(b",")] + if name == b"upgrade": + upgrade = value.lower() + if b"upgrade" in connection: + return upgrade + return None + + def _should_upgrade_to_ws(self, upgrade: bytes | None) -> bool: + if upgrade == b"websocket" and self.ws_protocol_class is not None: + return True + if self.config.ws == "auto": + msg = "Unsupported upgrade request." + self.logger.warning(msg) + msg = "No supported WebSocket library detected. Please use \"pip install 'uvicorn[standard]'\", or install 'websockets' or 'wsproto' manually." # noqa: E501 + self.logger.warning(msg) + return False + + def _should_upgrade(self) -> bool: + upgrade = self._get_upgrade() + return self._should_upgrade_to_ws(upgrade) + + def data_received(self, data: bytes) -> None: + self._unset_keepalive_if_required() + + try: + self.parser.feed_data(data) + except httptools.HttpParserError: + msg = "Invalid HTTP request received." + self.logger.warning(msg) + self.send_400_response(msg) + return + except httptools.HttpParserUpgrade: + upgrade = self._get_upgrade() + if self._should_upgrade_to_ws(upgrade): + self.handle_websocket_upgrade() + + def handle_websocket_upgrade(self) -> None: + if self.logger.level <= TRACE_LOG_LEVEL: + prefix = "%s:%d - " % self.client if self.client else "" + self.logger.log(TRACE_LOG_LEVEL, "%sUpgrading to WebSocket", prefix) + + self.connections.discard(self) + method = self.scope["method"].encode() + output = [method, b" ", self.url, b" HTTP/1.1\r\n"] + for name, value in self.scope["headers"]: + output += [name, b": ", value, b"\r\n"] + output.append(b"\r\n") + protocol = self.ws_protocol_class( # type: ignore[call-arg, misc] + config=self.config, + server_state=self.server_state, + app_state=self.app_state, + ) + protocol.connection_made(self.transport) + protocol.data_received(b"".join(output)) + self.transport.set_protocol(protocol) + + def send_400_response(self, msg: str) -> None: + content = [STATUS_LINE[400]] + for name, value in self.server_state.default_headers: + content.extend([name, b": ", value, b"\r\n"]) + content.extend( + [ + b"content-type: text/plain; charset=utf-8\r\n", + b"content-length: " + str(len(msg)).encode("ascii") + b"\r\n", + b"connection: close\r\n", + b"\r\n", + msg.encode("ascii"), + ] + ) + self.transport.write(b"".join(content)) + self.transport.close() + + def on_message_begin(self) -> None: + self.url = b"" + self.expect_100_continue = False + self.headers = [] + self.scope = { # type: ignore[typeddict-item] + "type": "http", + "asgi": {"version": self.config.asgi_version, "spec_version": "2.3"}, + "http_version": "1.1", + "server": self.server, + "client": self.client, + "scheme": self.scheme, # type: ignore[typeddict-item] + "root_path": self.root_path, + "headers": self.headers, + "state": self.app_state.copy(), + } + + # Parser callbacks + def on_url(self, url: bytes) -> None: + self.url += url + + def on_header(self, name: bytes, value: bytes) -> None: + name = name.lower() + if name == b"expect" and value.lower() == b"100-continue": + self.expect_100_continue = True + self.headers.append((name, value)) + + def on_headers_complete(self) -> None: + http_version = self.parser.get_http_version() + method = self.parser.get_method() + self.scope["method"] = method.decode("ascii") + if http_version != "1.1": + self.scope["http_version"] = http_version + if self.parser.should_upgrade() and self._should_upgrade(): + return + parsed_url = httptools.parse_url(self.url) + raw_path = parsed_url.path + path = raw_path.decode("ascii") + if "%" in path: + path = urllib.parse.unquote(path) + full_path = self.root_path + path + full_raw_path = self.root_path.encode("ascii") + raw_path + self.scope["path"] = full_path + self.scope["raw_path"] = full_raw_path + self.scope["query_string"] = parsed_url.query or b"" + + # Handle 503 responses when 'limit_concurrency' is exceeded. + if self.limit_concurrency is not None and ( + len(self.connections) >= self.limit_concurrency + or len(self.tasks) >= self.limit_concurrency + ): + app = service_unavailable + message = "Exceeded concurrency limit." + self.logger.warning(message) + else: + app = self.app + + existing_cycle = self.cycle + self.cycle = RequestResponseCycle( + scope=self.scope, + transport=self.transport, + flow=self.flow, + logger=self.logger, + access_logger=self.access_logger, + access_log=self.access_log, + default_headers=self.server_state.default_headers, + message_event=asyncio.Event(), + expect_100_continue=self.expect_100_continue, + keep_alive=http_version != "1.0", + on_response=self.on_response_complete, + ) + if existing_cycle is None or existing_cycle.response_complete: + # Standard case - start processing the request. + task = self.loop.create_task(self.cycle.run_asgi(app)) + task.add_done_callback(self.tasks.discard) + self.tasks.add(task) + else: + # Pipelined HTTP requests need to be queued up. + self.flow.pause_reading() + self.pipeline.appendleft((self.cycle, app)) + + def on_body(self, body: bytes) -> None: + if ( + self.parser.should_upgrade() and self._should_upgrade() + ) or self.cycle.response_complete: + return + self.cycle.body += body + if len(self.cycle.body) > HIGH_WATER_LIMIT: + self.flow.pause_reading() + self.cycle.message_event.set() + + def on_message_complete(self) -> None: + if ( + self.parser.should_upgrade() and self._should_upgrade() + ) or self.cycle.response_complete: + return + self.cycle.more_body = False + self.cycle.message_event.set() + + def on_response_complete(self) -> None: + # Callback for pipelined HTTP requests to be started. + self.server_state.total_requests += 1 + + if self.transport.is_closing(): + return + + self._unset_keepalive_if_required() + + # Unpause data reads if needed. + self.flow.resume_reading() + + # Unblock any pipelined events. If there are none, arm the + # Keep-Alive timeout instead. + if self.pipeline: + cycle, app = self.pipeline.pop() + task = self.loop.create_task(cycle.run_asgi(app)) + task.add_done_callback(self.tasks.discard) + self.tasks.add(task) + else: + self.timeout_keep_alive_task = self.loop.call_later( + self.timeout_keep_alive, self.timeout_keep_alive_handler + ) + + def shutdown(self) -> None: + """ + Called by the server to commence a graceful shutdown. + """ + if self.cycle is None or self.cycle.response_complete: + self.transport.close() + else: + self.cycle.keep_alive = False + + def pause_writing(self) -> None: + """ + Called by the transport when the write buffer exceeds the high water mark. + """ + self.flow.pause_writing() + + def resume_writing(self) -> None: + """ + Called by the transport when the write buffer drops below the low water mark. + """ + self.flow.resume_writing() + + def timeout_keep_alive_handler(self) -> None: + """ + Called on a keep-alive connection if no new data is received after a short + delay. + """ + if not self.transport.is_closing(): + self.transport.close() + + +class RequestResponseCycle: + def __init__( + self, + scope: "HTTPScope", + transport: asyncio.Transport, + flow: FlowControl, + logger: logging.Logger, + access_logger: logging.Logger, + access_log: bool, + default_headers: list[tuple[bytes, bytes]], + message_event: asyncio.Event, + expect_100_continue: bool, + keep_alive: bool, + on_response: Callable[..., None], + ): + self.scope = scope + self.transport = transport + self.flow = flow + self.logger = logger + self.access_logger = access_logger + self.access_log = access_log + self.default_headers = default_headers + self.message_event = message_event + self.on_response = on_response + + # Connection state + self.disconnected = False + self.keep_alive = keep_alive + self.waiting_for_100_continue = expect_100_continue + + # Request state + self.body = b"" + self.more_body = True + + # Response state + self.response_started = False + self.response_complete = False + self.chunked_encoding: bool | None = None + self.expected_content_length = 0 + + # ASGI exception wrapper + async def run_asgi(self, app: "ASGI3Application") -> None: + try: + result = await app( # type: ignore[func-returns-value] + self.scope, self.receive, self.send + ) + except BaseException as exc: + msg = "Exception in ASGI application\n" + self.logger.error(msg, exc_info=exc) + if not self.response_started: + await self.send_500_response() + else: + self.transport.close() + else: + if result is not None: + msg = "ASGI callable should return None, but returned '%s'." + self.logger.error(msg, result) + self.transport.close() + elif not self.response_started and not self.disconnected: + msg = "ASGI callable returned without starting response." + self.logger.error(msg) + await self.send_500_response() + elif not self.response_complete and not self.disconnected: + msg = "ASGI callable returned without completing response." + self.logger.error(msg) + self.transport.close() + finally: + self.on_response = lambda: None + + async def send_500_response(self) -> None: + response_start_event: "HTTPResponseStartEvent" = { + "type": "http.response.start", + "status": 500, + "headers": [ + (b"content-type", b"text/plain; charset=utf-8"), + (b"connection", b"close"), + ], + } + await self.send(response_start_event) + response_body_event: "HTTPResponseBodyEvent" = { + "type": "http.response.body", + "body": b"Internal Server Error", + "more_body": False, + } + await self.send(response_body_event) + + # ASGI interface + async def send(self, message: "ASGISendEvent") -> None: + message_type = message["type"] + + if self.flow.write_paused and not self.disconnected: + await self.flow.drain() + + if self.disconnected: + return + + if not self.response_started: + # Sending response status line and headers + if message_type != "http.response.start": + msg = "Expected ASGI message 'http.response.start', but got '%s'." + raise RuntimeError(msg % message_type) + message = cast("HTTPResponseStartEvent", message) + + self.response_started = True + self.waiting_for_100_continue = False + + status_code = message["status"] + headers = self.default_headers + list(message.get("headers", [])) + + if CLOSE_HEADER in self.scope["headers"] and CLOSE_HEADER not in headers: + headers = headers + [CLOSE_HEADER] + + if self.access_log: + self.access_logger.info( + '%s - "%s %s HTTP/%s" %d', + get_client_addr(self.scope), + self.scope["method"], + get_path_with_query_string(self.scope), + self.scope["http_version"], + status_code, + ) + + # Write response status line and headers + content = [STATUS_LINE[status_code]] + + for name, value in headers: + if HEADER_RE.search(name): + raise RuntimeError("Invalid HTTP header name.") + if HEADER_VALUE_RE.search(value): + raise RuntimeError("Invalid HTTP header value.") + + name = name.lower() + if name == b"content-length" and self.chunked_encoding is None: + self.expected_content_length = int(value.decode()) + self.chunked_encoding = False + elif name == b"transfer-encoding" and value.lower() == b"chunked": + self.expected_content_length = 0 + self.chunked_encoding = True + elif name == b"connection" and value.lower() == b"close": + self.keep_alive = False + content.extend([name, b": ", value, b"\r\n"]) + + if ( + self.chunked_encoding is None + and self.scope["method"] != "HEAD" + and status_code not in (204, 304) + ): + # Neither content-length nor transfer-encoding specified + self.chunked_encoding = True + content.append(b"transfer-encoding: chunked\r\n") + + content.append(b"\r\n") + self.transport.write(b"".join(content)) + + elif not self.response_complete: + # Sending response body + if message_type != "http.response.body": + msg = "Expected ASGI message 'http.response.body', but got '%s'." + raise RuntimeError(msg % message_type) + + body = cast(bytes, message.get("body", b"")) + more_body = message.get("more_body", False) + + # Write response body + if self.scope["method"] == "HEAD": + self.expected_content_length = 0 + elif self.chunked_encoding: + if body: + content = [b"%x\r\n" % len(body), body, b"\r\n"] + else: + content = [] + if not more_body: + content.append(b"0\r\n\r\n") + self.transport.write(b"".join(content)) + else: + num_bytes = len(body) + if num_bytes > self.expected_content_length: + raise RuntimeError("Response content longer than Content-Length") + else: + self.expected_content_length -= num_bytes + self.transport.write(body) + + # Handle response completion + if not more_body: + if self.expected_content_length != 0: + raise RuntimeError("Response content shorter than Content-Length") + self.response_complete = True + self.message_event.set() + if not self.keep_alive: + self.transport.close() + self.on_response() + + else: + # Response already sent + msg = "Unexpected ASGI message '%s' sent, after response already completed." + raise RuntimeError(msg % message_type) + + async def receive(self) -> "ASGIReceiveEvent": + if self.waiting_for_100_continue and not self.transport.is_closing(): + self.transport.write(b"HTTP/1.1 100 Continue\r\n\r\n") + self.waiting_for_100_continue = False + + if not self.disconnected and not self.response_complete: + self.flow.resume_reading() + await self.message_event.wait() + self.message_event.clear() + + message: HTTPDisconnectEvent | HTTPRequestEvent + if self.disconnected or self.response_complete: + message = {"type": "http.disconnect"} + else: + message = { + "type": "http.request", + "body": self.body, + "more_body": self.more_body, + } + self.body = b"" + + return message |