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Diffstat (limited to '.venv/lib/python3.12/site-packages/httpcore/_async/connection.py')
| -rw-r--r-- | .venv/lib/python3.12/site-packages/httpcore/_async/connection.py | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/httpcore/_async/connection.py b/.venv/lib/python3.12/site-packages/httpcore/_async/connection.py new file mode 100644 index 00000000..b42581df --- /dev/null +++ b/.venv/lib/python3.12/site-packages/httpcore/_async/connection.py @@ -0,0 +1,222 @@ +from __future__ import annotations + +import itertools +import logging +import ssl +import types +import typing + +from .._backends.auto import AutoBackend +from .._backends.base import SOCKET_OPTION, AsyncNetworkBackend, AsyncNetworkStream +from .._exceptions import ConnectError, ConnectTimeout +from .._models import Origin, Request, Response +from .._ssl import default_ssl_context +from .._synchronization import AsyncLock +from .._trace import Trace +from .http11 import AsyncHTTP11Connection +from .interfaces import AsyncConnectionInterface + +RETRIES_BACKOFF_FACTOR = 0.5 # 0s, 0.5s, 1s, 2s, 4s, etc. + + +logger = logging.getLogger("httpcore.connection") + + +def exponential_backoff(factor: float) -> typing.Iterator[float]: + """ + Generate a geometric sequence that has a ratio of 2 and starts with 0. + + For example: + - `factor = 2`: `0, 2, 4, 8, 16, 32, 64, ...` + - `factor = 3`: `0, 3, 6, 12, 24, 48, 96, ...` + """ + yield 0 + for n in itertools.count(): + yield factor * 2**n + + +class AsyncHTTPConnection(AsyncConnectionInterface): + def __init__( + self, + origin: Origin, + ssl_context: ssl.SSLContext | None = None, + keepalive_expiry: float | None = None, + http1: bool = True, + http2: bool = False, + retries: int = 0, + local_address: str | None = None, + uds: str | None = None, + network_backend: AsyncNetworkBackend | None = None, + socket_options: typing.Iterable[SOCKET_OPTION] | None = None, + ) -> None: + self._origin = origin + self._ssl_context = ssl_context + self._keepalive_expiry = keepalive_expiry + self._http1 = http1 + self._http2 = http2 + self._retries = retries + self._local_address = local_address + self._uds = uds + + self._network_backend: AsyncNetworkBackend = ( + AutoBackend() if network_backend is None else network_backend + ) + self._connection: AsyncConnectionInterface | None = None + self._connect_failed: bool = False + self._request_lock = AsyncLock() + self._socket_options = socket_options + + async def handle_async_request(self, request: Request) -> Response: + if not self.can_handle_request(request.url.origin): + raise RuntimeError( + f"Attempted to send request to {request.url.origin} on connection to {self._origin}" + ) + + try: + async with self._request_lock: + if self._connection is None: + stream = await self._connect(request) + + ssl_object = stream.get_extra_info("ssl_object") + http2_negotiated = ( + ssl_object is not None + and ssl_object.selected_alpn_protocol() == "h2" + ) + if http2_negotiated or (self._http2 and not self._http1): + from .http2 import AsyncHTTP2Connection + + self._connection = AsyncHTTP2Connection( + origin=self._origin, + stream=stream, + keepalive_expiry=self._keepalive_expiry, + ) + else: + self._connection = AsyncHTTP11Connection( + origin=self._origin, + stream=stream, + keepalive_expiry=self._keepalive_expiry, + ) + except BaseException as exc: + self._connect_failed = True + raise exc + + return await self._connection.handle_async_request(request) + + async def _connect(self, request: Request) -> AsyncNetworkStream: + timeouts = request.extensions.get("timeout", {}) + sni_hostname = request.extensions.get("sni_hostname", None) + timeout = timeouts.get("connect", None) + + retries_left = self._retries + delays = exponential_backoff(factor=RETRIES_BACKOFF_FACTOR) + + while True: + try: + if self._uds is None: + kwargs = { + "host": self._origin.host.decode("ascii"), + "port": self._origin.port, + "local_address": self._local_address, + "timeout": timeout, + "socket_options": self._socket_options, + } + async with Trace("connect_tcp", logger, request, kwargs) as trace: + stream = await self._network_backend.connect_tcp(**kwargs) + trace.return_value = stream + else: + kwargs = { + "path": self._uds, + "timeout": timeout, + "socket_options": self._socket_options, + } + async with Trace( + "connect_unix_socket", logger, request, kwargs + ) as trace: + stream = await self._network_backend.connect_unix_socket( + **kwargs + ) + trace.return_value = stream + + if self._origin.scheme in (b"https", b"wss"): + ssl_context = ( + default_ssl_context() + if self._ssl_context is None + else self._ssl_context + ) + alpn_protocols = ["http/1.1", "h2"] if self._http2 else ["http/1.1"] + ssl_context.set_alpn_protocols(alpn_protocols) + + kwargs = { + "ssl_context": ssl_context, + "server_hostname": sni_hostname + or self._origin.host.decode("ascii"), + "timeout": timeout, + } + async with Trace("start_tls", logger, request, kwargs) as trace: + stream = await stream.start_tls(**kwargs) + trace.return_value = stream + return stream + except (ConnectError, ConnectTimeout): + if retries_left <= 0: + raise + retries_left -= 1 + delay = next(delays) + async with Trace("retry", logger, request, kwargs) as trace: + await self._network_backend.sleep(delay) + + def can_handle_request(self, origin: Origin) -> bool: + return origin == self._origin + + async def aclose(self) -> None: + if self._connection is not None: + async with Trace("close", logger, None, {}): + await self._connection.aclose() + + def is_available(self) -> bool: + if self._connection is None: + # If HTTP/2 support is enabled, and the resulting connection could + # end up as HTTP/2 then we should indicate the connection as being + # available to service multiple requests. + return ( + self._http2 + and (self._origin.scheme == b"https" or not self._http1) + and not self._connect_failed + ) + return self._connection.is_available() + + def has_expired(self) -> bool: + if self._connection is None: + return self._connect_failed + return self._connection.has_expired() + + def is_idle(self) -> bool: + if self._connection is None: + return self._connect_failed + return self._connection.is_idle() + + def is_closed(self) -> bool: + if self._connection is None: + return self._connect_failed + return self._connection.is_closed() + + def info(self) -> str: + if self._connection is None: + return "CONNECTION FAILED" if self._connect_failed else "CONNECTING" + return self._connection.info() + + def __repr__(self) -> str: + return f"<{self.__class__.__name__} [{self.info()}]>" + + # 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) -> AsyncHTTPConnection: + return self + + async def __aexit__( + self, + exc_type: type[BaseException] | None = None, + exc_value: BaseException | None = None, + traceback: types.TracebackType | None = None, + ) -> None: + await self.aclose() |