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httptools_impl.py
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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, Literal, cast import httptools from uvicorn._types import ( ASGI3Application, ASGIReceiveEvent, ASGISendEvent, HTTPRequestEvent, 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-\x08\x0a-\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 # pragma: full coverage def _should_upgrade_to_ws(self) -> bool: if self.ws_protocol_class is None: return False return True def _unsupported_upgrade_warning(self) -> None: self.logger.warning("Unsupported upgrade request.") if not self._should_upgrade_to_ws(): msg = "No supported WebSocket library detected. Please use \"pip install 'uvicorn[standard]'\", or install 'websockets' or 'wsproto' manually." # noqa: E501 self.logger.warning(msg) def _should_upgrade(self) -> bool: upgrade = self._get_upgrade() return upgrade == b"websocket" and self._should_upgrade_to_ws() 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: if self._should_upgrade(): self.handle_websocket_upgrade() else: self._unsupported_upgrade_warning() 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"]) # pragma: full coverage 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": "2.4"}, "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() # pragma: full coverage def resume_writing(self) -> None: """ Called by the transport when the write buffer drops below the low water mark. """ self.flow.resume_writing() # pragma: full coverage 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: await self.send( { "type": "http.response.start", "status": 500, "headers": [ (b"content-type", b"text/plain; charset=utf-8"), (b"content-length", b"21"), (b"connection", b"close"), ], } ) await self.send({"type": "http.response.body", "body": b"Internal Server Error", "more_body": False}) # 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() # pragma: full coverage if self.disconnected: return # pragma: full coverage 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.") # pragma: full coverage 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() 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