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http2.py
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from __future__ import annotations import threading import types import typing import h2.config # type: ignore[import-untyped] import h2.connection # type: ignore[import-untyped] import h2.events # type: ignore[import-untyped] import urllib3.connection import urllib3.util.ssl_ from urllib3.response import BaseHTTPResponse from ._collections import HTTPHeaderDict from .connection import HTTPSConnection from .connectionpool import HTTPSConnectionPool orig_HTTPSConnection = HTTPSConnection T = typing.TypeVar("T") class _LockedObject(typing.Generic[T]): """ A wrapper class that hides a specific object behind a lock. The goal here is to provide a simple way to protect access to an object that cannot safely be simultaneously accessed from multiple threads. The intended use of this class is simple: take hold of it with a context manager, which returns the protected object. """ def __init__(self, obj: T): self.lock = threading.RLock() self._obj = obj def __enter__(self) -> T: self.lock.acquire() return self._obj def __exit__( self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: types.TracebackType | None, ) -> None: self.lock.release() class HTTP2Connection(HTTPSConnection): def __init__( self, host: str, port: int | None = None, **kwargs: typing.Any ) -> None: self._h2_conn = self._new_h2_conn() self._h2_stream: int | None = None self._h2_headers: list[tuple[bytes, bytes]] = [] if "proxy" in kwargs or "proxy_config" in kwargs: # Defensive: raise NotImplementedError("Proxies aren't supported with HTTP/2") super().__init__(host, port, **kwargs) def _new_h2_conn(self) -> _LockedObject[h2.connection.H2Connection]: config = h2.config.H2Configuration(client_side=True) return _LockedObject(h2.connection.H2Connection(config=config)) def connect(self) -> None: super().connect() with self._h2_conn as h2_conn: h2_conn.initiate_connection() self.sock.sendall(h2_conn.data_to_send()) def putrequest( self, method: str, url: str, skip_host: bool = False, skip_accept_encoding: bool = False, ) -> None: with self._h2_conn as h2_conn: self._request_url = url self._h2_stream = h2_conn.get_next_available_stream_id() if ":" in self.host: authority = f"[{self.host}]:{self.port or 443}" else: authority = f"{self.host}:{self.port or 443}" self._h2_headers.extend( ( (b":scheme", b"https"), (b":method", method.encode()), (b":authority", authority.encode()), (b":path", url.encode()), ) ) def putheader(self, header: str, *values: str) -> None: # type: ignore[override] for value in values: self._h2_headers.append( (header.encode("utf-8").lower(), value.encode("utf-8")) ) def endheaders(self) -> None: # type: ignore[override] with self._h2_conn as h2_conn: h2_conn.send_headers( stream_id=self._h2_stream, headers=self._h2_headers, end_stream=True, ) if data_to_send := h2_conn.data_to_send(): self.sock.sendall(data_to_send) def send(self, data: bytes) -> None: # type: ignore[override] # Defensive: if not data: return raise NotImplementedError("Sending data isn't supported yet") def getresponse( # type: ignore[override] self, ) -> HTTP2Response: status = None data = bytearray() with self._h2_conn as h2_conn: end_stream = False while not end_stream: # TODO: Arbitrary read value. if received_data := self.sock.recv(65535): events = h2_conn.receive_data(received_data) for event in events: if isinstance(event, h2.events.ResponseReceived): headers = HTTPHeaderDict() for header, value in event.headers: if header == b":status": status = int(value.decode()) else: headers.add( header.decode("ascii"), value.decode("ascii") ) elif isinstance(event, h2.events.DataReceived): data += event.data h2_conn.acknowledge_received_data( event.flow_controlled_length, event.stream_id ) elif isinstance(event, h2.events.StreamEnded): end_stream = True if data_to_send := h2_conn.data_to_send(): self.sock.sendall(data_to_send) # We always close to not have to handle connection management. self.close() assert status is not None return HTTP2Response( status=status, headers=headers, request_url=self._request_url, data=bytes(data), ) def close(self) -> None: with self._h2_conn as h2_conn: try: h2_conn.close_connection() if data := h2_conn.data_to_send(): self.sock.sendall(data) except Exception: pass # Reset all our HTTP/2 connection state. self._h2_conn = self._new_h2_conn() self._h2_stream = None self._h2_headers = [] super().close() class HTTP2Response(BaseHTTPResponse): # TODO: This is a woefully incomplete response object, but works for non-streaming. def __init__( self, status: int, headers: HTTPHeaderDict, request_url: str, data: bytes, decode_content: bool = False, # TODO: support decoding ) -> None: super().__init__( status=status, headers=headers, # Following CPython, we map HTTP versions to major * 10 + minor integers version=20, # No reason phrase in HTTP/2 reason=None, decode_content=decode_content, request_url=request_url, ) self._data = data self.length_remaining = 0 @property def data(self) -> bytes: return self._data def get_redirect_location(self) -> None: return None def close(self) -> None: pass def inject_into_urllib3() -> None: HTTPSConnectionPool.ConnectionCls = HTTP2Connection urllib3.connection.HTTPSConnection = HTTP2Connection # type: ignore[misc] # TODO: Offer 'http/1.1' as well, but for testing purposes this is handy. urllib3.util.ssl_.ALPN_PROTOCOLS = ["h2"] def extract_from_urllib3() -> None: HTTPSConnectionPool.ConnectionCls = orig_HTTPSConnection urllib3.connection.HTTPSConnection = orig_HTTPSConnection # type: ignore[misc] urllib3.util.ssl_.ALPN_PROTOCOLS = ["http/1.1"]