590 lines
23 KiB
Python
590 lines
23 KiB
Python
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import enum
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import logging
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import time
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import types
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import typing
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import h2.config
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import h2.connection
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import h2.events
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import h2.exceptions
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import h2.settings
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from .._backends.base import AsyncNetworkStream
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from .._exceptions import (
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ConnectionNotAvailable,
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LocalProtocolError,
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RemoteProtocolError,
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)
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from .._models import Origin, Request, Response
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from .._synchronization import AsyncLock, AsyncSemaphore, AsyncShieldCancellation
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from .._trace import Trace
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from .interfaces import AsyncConnectionInterface
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logger = logging.getLogger("httpcore.http2")
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def has_body_headers(request: Request) -> bool:
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return any(
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k.lower() == b"content-length" or k.lower() == b"transfer-encoding"
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for k, v in request.headers
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)
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class HTTPConnectionState(enum.IntEnum):
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ACTIVE = 1
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IDLE = 2
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CLOSED = 3
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class AsyncHTTP2Connection(AsyncConnectionInterface):
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READ_NUM_BYTES = 64 * 1024
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CONFIG = h2.config.H2Configuration(validate_inbound_headers=False)
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def __init__(
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self,
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origin: Origin,
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stream: AsyncNetworkStream,
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keepalive_expiry: typing.Optional[float] = None,
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):
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self._origin = origin
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self._network_stream = stream
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self._keepalive_expiry: typing.Optional[float] = keepalive_expiry
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self._h2_state = h2.connection.H2Connection(config=self.CONFIG)
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self._state = HTTPConnectionState.IDLE
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self._expire_at: typing.Optional[float] = None
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self._request_count = 0
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self._init_lock = AsyncLock()
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self._state_lock = AsyncLock()
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self._read_lock = AsyncLock()
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self._write_lock = AsyncLock()
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self._sent_connection_init = False
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self._used_all_stream_ids = False
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self._connection_error = False
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# Mapping from stream ID to response stream events.
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self._events: typing.Dict[
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int,
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typing.Union[
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h2.events.ResponseReceived,
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h2.events.DataReceived,
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h2.events.StreamEnded,
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h2.events.StreamReset,
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],
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] = {}
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# Connection terminated events are stored as state since
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# we need to handle them for all streams.
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self._connection_terminated: typing.Optional[
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h2.events.ConnectionTerminated
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] = None
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self._read_exception: typing.Optional[Exception] = None
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self._write_exception: typing.Optional[Exception] = None
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async def handle_async_request(self, request: Request) -> Response:
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if not self.can_handle_request(request.url.origin):
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# This cannot occur in normal operation, since the connection pool
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# will only send requests on connections that handle them.
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# It's in place simply for resilience as a guard against incorrect
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# usage, for anyone working directly with httpcore connections.
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raise RuntimeError(
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f"Attempted to send request to {request.url.origin} on connection "
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f"to {self._origin}"
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)
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async with self._state_lock:
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if self._state in (HTTPConnectionState.ACTIVE, HTTPConnectionState.IDLE):
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self._request_count += 1
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self._expire_at = None
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self._state = HTTPConnectionState.ACTIVE
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else:
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raise ConnectionNotAvailable()
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async with self._init_lock:
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if not self._sent_connection_init:
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try:
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kwargs = {"request": request}
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async with Trace("send_connection_init", logger, request, kwargs):
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await self._send_connection_init(**kwargs)
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except BaseException as exc:
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with AsyncShieldCancellation():
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await self.aclose()
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raise exc
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self._sent_connection_init = True
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# Initially start with just 1 until the remote server provides
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# its max_concurrent_streams value
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self._max_streams = 1
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local_settings_max_streams = (
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self._h2_state.local_settings.max_concurrent_streams
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)
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self._max_streams_semaphore = AsyncSemaphore(local_settings_max_streams)
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for _ in range(local_settings_max_streams - self._max_streams):
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await self._max_streams_semaphore.acquire()
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await self._max_streams_semaphore.acquire()
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try:
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stream_id = self._h2_state.get_next_available_stream_id()
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self._events[stream_id] = []
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except h2.exceptions.NoAvailableStreamIDError: # pragma: nocover
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self._used_all_stream_ids = True
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self._request_count -= 1
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raise ConnectionNotAvailable()
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try:
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kwargs = {"request": request, "stream_id": stream_id}
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async with Trace("send_request_headers", logger, request, kwargs):
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await self._send_request_headers(request=request, stream_id=stream_id)
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async with Trace("send_request_body", logger, request, kwargs):
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await self._send_request_body(request=request, stream_id=stream_id)
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async with Trace(
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"receive_response_headers", logger, request, kwargs
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) as trace:
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status, headers = await self._receive_response(
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request=request, stream_id=stream_id
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)
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trace.return_value = (status, headers)
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return Response(
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status=status,
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headers=headers,
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content=HTTP2ConnectionByteStream(self, request, stream_id=stream_id),
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extensions={
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"http_version": b"HTTP/2",
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"network_stream": self._network_stream,
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"stream_id": stream_id,
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},
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)
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except BaseException as exc: # noqa: PIE786
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with AsyncShieldCancellation():
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kwargs = {"stream_id": stream_id}
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async with Trace("response_closed", logger, request, kwargs):
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await self._response_closed(stream_id=stream_id)
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if isinstance(exc, h2.exceptions.ProtocolError):
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# One case where h2 can raise a protocol error is when a
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# closed frame has been seen by the state machine.
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#
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# This happens when one stream is reading, and encounters
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# a GOAWAY event. Other flows of control may then raise
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# a protocol error at any point they interact with the 'h2_state'.
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#
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# In this case we'll have stored the event, and should raise
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# it as a RemoteProtocolError.
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if self._connection_terminated: # pragma: nocover
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raise RemoteProtocolError(self._connection_terminated)
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# If h2 raises a protocol error in some other state then we
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# must somehow have made a protocol violation.
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raise LocalProtocolError(exc) # pragma: nocover
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raise exc
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async def _send_connection_init(self, request: Request) -> None:
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"""
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The HTTP/2 connection requires some initial setup before we can start
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using individual request/response streams on it.
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"""
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# Need to set these manually here instead of manipulating via
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# __setitem__() otherwise the H2Connection will emit SettingsUpdate
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# frames in addition to sending the undesired defaults.
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self._h2_state.local_settings = h2.settings.Settings(
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client=True,
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initial_values={
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# Disable PUSH_PROMISE frames from the server since we don't do anything
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# with them for now. Maybe when we support caching?
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h2.settings.SettingCodes.ENABLE_PUSH: 0,
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# These two are taken from h2 for safe defaults
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h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS: 100,
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h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE: 65536,
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},
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)
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# Some websites (*cough* Yahoo *cough*) balk at this setting being
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# present in the initial handshake since it's not defined in the original
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# RFC despite the RFC mandating ignoring settings you don't know about.
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del self._h2_state.local_settings[
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h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL
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]
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self._h2_state.initiate_connection()
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self._h2_state.increment_flow_control_window(2**24)
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await self._write_outgoing_data(request)
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# Sending the request...
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async def _send_request_headers(self, request: Request, stream_id: int) -> None:
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"""
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Send the request headers to a given stream ID.
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"""
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end_stream = not has_body_headers(request)
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# In HTTP/2 the ':authority' pseudo-header is used instead of 'Host'.
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# In order to gracefully handle HTTP/1.1 and HTTP/2 we always require
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# HTTP/1.1 style headers, and map them appropriately if we end up on
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# an HTTP/2 connection.
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authority = [v for k, v in request.headers if k.lower() == b"host"][0]
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headers = [
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(b":method", request.method),
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(b":authority", authority),
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(b":scheme", request.url.scheme),
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(b":path", request.url.target),
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] + [
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(k.lower(), v)
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for k, v in request.headers
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if k.lower()
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not in (
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b"host",
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b"transfer-encoding",
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)
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]
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self._h2_state.send_headers(stream_id, headers, end_stream=end_stream)
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self._h2_state.increment_flow_control_window(2**24, stream_id=stream_id)
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await self._write_outgoing_data(request)
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async def _send_request_body(self, request: Request, stream_id: int) -> None:
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"""
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Iterate over the request body sending it to a given stream ID.
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"""
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if not has_body_headers(request):
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return
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assert isinstance(request.stream, typing.AsyncIterable)
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async for data in request.stream:
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await self._send_stream_data(request, stream_id, data)
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await self._send_end_stream(request, stream_id)
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async def _send_stream_data(
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self, request: Request, stream_id: int, data: bytes
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) -> None:
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"""
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Send a single chunk of data in one or more data frames.
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"""
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while data:
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max_flow = await self._wait_for_outgoing_flow(request, stream_id)
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chunk_size = min(len(data), max_flow)
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chunk, data = data[:chunk_size], data[chunk_size:]
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self._h2_state.send_data(stream_id, chunk)
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await self._write_outgoing_data(request)
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async def _send_end_stream(self, request: Request, stream_id: int) -> None:
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"""
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Send an empty data frame on on a given stream ID with the END_STREAM flag set.
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"""
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self._h2_state.end_stream(stream_id)
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await self._write_outgoing_data(request)
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# Receiving the response...
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async def _receive_response(
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self, request: Request, stream_id: int
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) -> typing.Tuple[int, typing.List[typing.Tuple[bytes, bytes]]]:
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"""
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Return the response status code and headers for a given stream ID.
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"""
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while True:
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event = await self._receive_stream_event(request, stream_id)
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if isinstance(event, h2.events.ResponseReceived):
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break
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status_code = 200
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headers = []
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for k, v in event.headers:
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if k == b":status":
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status_code = int(v.decode("ascii", errors="ignore"))
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elif not k.startswith(b":"):
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headers.append((k, v))
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return (status_code, headers)
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async def _receive_response_body(
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self, request: Request, stream_id: int
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) -> typing.AsyncIterator[bytes]:
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"""
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Iterator that returns the bytes of the response body for a given stream ID.
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"""
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while True:
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event = await self._receive_stream_event(request, stream_id)
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if isinstance(event, h2.events.DataReceived):
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amount = event.flow_controlled_length
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self._h2_state.acknowledge_received_data(amount, stream_id)
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await self._write_outgoing_data(request)
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yield event.data
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elif isinstance(event, h2.events.StreamEnded):
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break
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async def _receive_stream_event(
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self, request: Request, stream_id: int
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) -> typing.Union[
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h2.events.ResponseReceived, h2.events.DataReceived, h2.events.StreamEnded
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]:
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"""
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Return the next available event for a given stream ID.
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Will read more data from the network if required.
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"""
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while not self._events.get(stream_id):
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await self._receive_events(request, stream_id)
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event = self._events[stream_id].pop(0)
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if isinstance(event, h2.events.StreamReset):
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raise RemoteProtocolError(event)
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return event
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async def _receive_events(
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self, request: Request, stream_id: typing.Optional[int] = None
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) -> None:
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"""
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Read some data from the network until we see one or more events
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for a given stream ID.
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"""
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async with self._read_lock:
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if self._connection_terminated is not None:
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last_stream_id = self._connection_terminated.last_stream_id
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if stream_id and last_stream_id and stream_id > last_stream_id:
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self._request_count -= 1
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raise ConnectionNotAvailable()
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raise RemoteProtocolError(self._connection_terminated)
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# This conditional is a bit icky. We don't want to block reading if we've
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# actually got an event to return for a given stream. We need to do that
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# check *within* the atomic read lock. Though it also need to be optional,
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# because when we call it from `_wait_for_outgoing_flow` we *do* want to
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# block until we've available flow control, event when we have events
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# pending for the stream ID we're attempting to send on.
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if stream_id is None or not self._events.get(stream_id):
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events = await self._read_incoming_data(request)
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for event in events:
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if isinstance(event, h2.events.RemoteSettingsChanged):
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async with Trace(
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"receive_remote_settings", logger, request
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|
) as trace:
|
||
|
|
await self._receive_remote_settings_change(event)
|
||
|
|
trace.return_value = event
|
||
|
|
|
||
|
|
elif isinstance(
|
||
|
|
event,
|
||
|
|
(
|
||
|
|
h2.events.ResponseReceived,
|
||
|
|
h2.events.DataReceived,
|
||
|
|
h2.events.StreamEnded,
|
||
|
|
h2.events.StreamReset,
|
||
|
|
),
|
||
|
|
):
|
||
|
|
if event.stream_id in self._events:
|
||
|
|
self._events[event.stream_id].append(event)
|
||
|
|
|
||
|
|
elif isinstance(event, h2.events.ConnectionTerminated):
|
||
|
|
self._connection_terminated = event
|
||
|
|
|
||
|
|
await self._write_outgoing_data(request)
|
||
|
|
|
||
|
|
async def _receive_remote_settings_change(self, event: h2.events.Event) -> None:
|
||
|
|
max_concurrent_streams = event.changed_settings.get(
|
||
|
|
h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS
|
||
|
|
)
|
||
|
|
if max_concurrent_streams:
|
||
|
|
new_max_streams = min(
|
||
|
|
max_concurrent_streams.new_value,
|
||
|
|
self._h2_state.local_settings.max_concurrent_streams,
|
||
|
|
)
|
||
|
|
if new_max_streams and new_max_streams != self._max_streams:
|
||
|
|
while new_max_streams > self._max_streams:
|
||
|
|
await self._max_streams_semaphore.release()
|
||
|
|
self._max_streams += 1
|
||
|
|
while new_max_streams < self._max_streams:
|
||
|
|
await self._max_streams_semaphore.acquire()
|
||
|
|
self._max_streams -= 1
|
||
|
|
|
||
|
|
async def _response_closed(self, stream_id: int) -> None:
|
||
|
|
await self._max_streams_semaphore.release()
|
||
|
|
del self._events[stream_id]
|
||
|
|
async with self._state_lock:
|
||
|
|
if self._connection_terminated and not self._events:
|
||
|
|
await self.aclose()
|
||
|
|
|
||
|
|
elif self._state == HTTPConnectionState.ACTIVE and not self._events:
|
||
|
|
self._state = HTTPConnectionState.IDLE
|
||
|
|
if self._keepalive_expiry is not None:
|
||
|
|
now = time.monotonic()
|
||
|
|
self._expire_at = now + self._keepalive_expiry
|
||
|
|
if self._used_all_stream_ids: # pragma: nocover
|
||
|
|
await self.aclose()
|
||
|
|
|
||
|
|
async def aclose(self) -> None:
|
||
|
|
# Note that this method unilaterally closes the connection, and does
|
||
|
|
# not have any kind of locking in place around it.
|
||
|
|
self._h2_state.close_connection()
|
||
|
|
self._state = HTTPConnectionState.CLOSED
|
||
|
|
await self._network_stream.aclose()
|
||
|
|
|
||
|
|
# Wrappers around network read/write operations...
|
||
|
|
|
||
|
|
async def _read_incoming_data(
|
||
|
|
self, request: Request
|
||
|
|
) -> typing.List[h2.events.Event]:
|
||
|
|
timeouts = request.extensions.get("timeout", {})
|
||
|
|
timeout = timeouts.get("read", None)
|
||
|
|
|
||
|
|
if self._read_exception is not None:
|
||
|
|
raise self._read_exception # pragma: nocover
|
||
|
|
|
||
|
|
try:
|
||
|
|
data = await self._network_stream.read(self.READ_NUM_BYTES, timeout)
|
||
|
|
if data == b"":
|
||
|
|
raise RemoteProtocolError("Server disconnected")
|
||
|
|
except Exception as exc:
|
||
|
|
# If we get a network error we should:
|
||
|
|
#
|
||
|
|
# 1. Save the exception and just raise it immediately on any future reads.
|
||
|
|
# (For example, this means that a single read timeout or disconnect will
|
||
|
|
# immediately close all pending streams. Without requiring multiple
|
||
|
|
# sequential timeouts.)
|
||
|
|
# 2. Mark the connection as errored, so that we don't accept any other
|
||
|
|
# incoming requests.
|
||
|
|
self._read_exception = exc
|
||
|
|
self._connection_error = True
|
||
|
|
raise exc
|
||
|
|
|
||
|
|
events: typing.List[h2.events.Event] = self._h2_state.receive_data(data)
|
||
|
|
|
||
|
|
return events
|
||
|
|
|
||
|
|
async def _write_outgoing_data(self, request: Request) -> None:
|
||
|
|
timeouts = request.extensions.get("timeout", {})
|
||
|
|
timeout = timeouts.get("write", None)
|
||
|
|
|
||
|
|
async with self._write_lock:
|
||
|
|
data_to_send = self._h2_state.data_to_send()
|
||
|
|
|
||
|
|
if self._write_exception is not None:
|
||
|
|
raise self._write_exception # pragma: nocover
|
||
|
|
|
||
|
|
try:
|
||
|
|
await self._network_stream.write(data_to_send, timeout)
|
||
|
|
except Exception as exc: # pragma: nocover
|
||
|
|
# If we get a network error we should:
|
||
|
|
#
|
||
|
|
# 1. Save the exception and just raise it immediately on any future write.
|
||
|
|
# (For example, this means that a single write timeout or disconnect will
|
||
|
|
# immediately close all pending streams. Without requiring multiple
|
||
|
|
# sequential timeouts.)
|
||
|
|
# 2. Mark the connection as errored, so that we don't accept any other
|
||
|
|
# incoming requests.
|
||
|
|
self._write_exception = exc
|
||
|
|
self._connection_error = True
|
||
|
|
raise exc
|
||
|
|
|
||
|
|
# Flow control...
|
||
|
|
|
||
|
|
async def _wait_for_outgoing_flow(self, request: Request, stream_id: int) -> int:
|
||
|
|
"""
|
||
|
|
Returns the maximum allowable outgoing flow for a given stream.
|
||
|
|
|
||
|
|
If the allowable flow is zero, then waits on the network until
|
||
|
|
WindowUpdated frames have increased the flow rate.
|
||
|
|
https://tools.ietf.org/html/rfc7540#section-6.9
|
||
|
|
"""
|
||
|
|
local_flow: int = self._h2_state.local_flow_control_window(stream_id)
|
||
|
|
max_frame_size: int = self._h2_state.max_outbound_frame_size
|
||
|
|
flow = min(local_flow, max_frame_size)
|
||
|
|
while flow == 0:
|
||
|
|
await self._receive_events(request)
|
||
|
|
local_flow = self._h2_state.local_flow_control_window(stream_id)
|
||
|
|
max_frame_size = self._h2_state.max_outbound_frame_size
|
||
|
|
flow = min(local_flow, max_frame_size)
|
||
|
|
return flow
|
||
|
|
|
||
|
|
# Interface for connection pooling...
|
||
|
|
|
||
|
|
def can_handle_request(self, origin: Origin) -> bool:
|
||
|
|
return origin == self._origin
|
||
|
|
|
||
|
|
def is_available(self) -> bool:
|
||
|
|
return (
|
||
|
|
self._state != HTTPConnectionState.CLOSED
|
||
|
|
and not self._connection_error
|
||
|
|
and not self._used_all_stream_ids
|
||
|
|
and not (
|
||
|
|
self._h2_state.state_machine.state
|
||
|
|
== h2.connection.ConnectionState.CLOSED
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
def has_expired(self) -> bool:
|
||
|
|
now = time.monotonic()
|
||
|
|
return self._expire_at is not None and now > self._expire_at
|
||
|
|
|
||
|
|
def is_idle(self) -> bool:
|
||
|
|
return self._state == HTTPConnectionState.IDLE
|
||
|
|
|
||
|
|
def is_closed(self) -> bool:
|
||
|
|
return self._state == HTTPConnectionState.CLOSED
|
||
|
|
|
||
|
|
def info(self) -> str:
|
||
|
|
origin = str(self._origin)
|
||
|
|
return (
|
||
|
|
f"{origin!r}, HTTP/2, {self._state.name}, "
|
||
|
|
f"Request Count: {self._request_count}"
|
||
|
|
)
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
class_name = self.__class__.__name__
|
||
|
|
origin = str(self._origin)
|
||
|
|
return (
|
||
|
|
f"<{class_name} [{origin!r}, {self._state.name}, "
|
||
|
|
f"Request Count: {self._request_count}]>"
|
||
|
|
)
|
||
|
|
|
||
|
|
# These context managers are not used in the standard flow, but are
|
||
|
|
# useful for testing or working with connection instances directly.
|
||
|
|
|
||
|
|
async def __aenter__(self) -> "AsyncHTTP2Connection":
|
||
|
|
return self
|
||
|
|
|
||
|
|
async def __aexit__(
|
||
|
|
self,
|
||
|
|
exc_type: typing.Optional[typing.Type[BaseException]] = None,
|
||
|
|
exc_value: typing.Optional[BaseException] = None,
|
||
|
|
traceback: typing.Optional[types.TracebackType] = None,
|
||
|
|
) -> None:
|
||
|
|
await self.aclose()
|
||
|
|
|
||
|
|
|
||
|
|
class HTTP2ConnectionByteStream:
|
||
|
|
def __init__(
|
||
|
|
self, connection: AsyncHTTP2Connection, request: Request, stream_id: int
|
||
|
|
) -> None:
|
||
|
|
self._connection = connection
|
||
|
|
self._request = request
|
||
|
|
self._stream_id = stream_id
|
||
|
|
self._closed = False
|
||
|
|
|
||
|
|
async def __aiter__(self) -> typing.AsyncIterator[bytes]:
|
||
|
|
kwargs = {"request": self._request, "stream_id": self._stream_id}
|
||
|
|
try:
|
||
|
|
async with Trace("receive_response_body", logger, self._request, kwargs):
|
||
|
|
async for chunk in self._connection._receive_response_body(
|
||
|
|
request=self._request, stream_id=self._stream_id
|
||
|
|
):
|
||
|
|
yield chunk
|
||
|
|
except BaseException as exc:
|
||
|
|
# If we get an exception while streaming the response,
|
||
|
|
# we want to close the response (and possibly the connection)
|
||
|
|
# before raising that exception.
|
||
|
|
with AsyncShieldCancellation():
|
||
|
|
await self.aclose()
|
||
|
|
raise exc
|
||
|
|
|
||
|
|
async def aclose(self) -> None:
|
||
|
|
if not self._closed:
|
||
|
|
self._closed = True
|
||
|
|
kwargs = {"stream_id": self._stream_id}
|
||
|
|
async with Trace("response_closed", logger, self._request, kwargs):
|
||
|
|
await self._connection._response_closed(stream_id=self._stream_id)
|