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import ssl import typing import anyio from .._exceptions import ( ConnectError, ConnectTimeout, ReadError, ReadTimeout, WriteError, WriteTimeout, map_exceptions, ) from .._utils import is_socket_readable from .base import AsyncNetworkBackend, AsyncNetworkStream class AsyncIOStream(AsyncNetworkStream): def __init__(self, stream: anyio.abc.ByteStream) -> None: self._stream = stream async def read( self, max_bytes: int, timeout: typing.Optional[float] = None ) -> bytes: exc_map = { TimeoutError: ReadTimeout, anyio.BrokenResourceError: ReadError, anyio.ClosedResourceError: ReadError, } with map_exceptions(exc_map): with anyio.fail_after(timeout): try: return await self._stream.receive(max_bytes=max_bytes) except anyio.EndOfStream: # pragma: nocover return b"" async def write( self, buffer: bytes, timeout: typing.Optional[float] = None ) -> None: if not buffer: return exc_map = { TimeoutError: WriteTimeout, anyio.BrokenResourceError: WriteError, anyio.ClosedResourceError: WriteError, } with map_exceptions(exc_map): with anyio.fail_after(timeout): await self._stream.send(item=buffer) async def aclose(self) -> None: await self._stream.aclose() async def start_tls( self, ssl_context: ssl.SSLContext, server_hostname: typing.Optional[str] = None, timeout: typing.Optional[float] = None, ) -> AsyncNetworkStream: exc_map = { TimeoutError: ConnectTimeout, anyio.BrokenResourceError: ConnectError, } with map_exceptions(exc_map): try: with anyio.fail_after(timeout): ssl_stream = await anyio.streams.tls.TLSStream.wrap( self._stream, ssl_context=ssl_context, hostname=server_hostname, standard_compatible=False, server_side=False, ) except Exception as exc: # pragma: nocover await self.aclose() raise exc return AsyncIOStream(ssl_stream) def get_extra_info(self, info: str) -> typing.Any: if info == "ssl_object": return self._stream.extra(anyio.streams.tls.TLSAttribute.ssl_object, None) if info == "client_addr": return self._stream.extra(anyio.abc.SocketAttribute.local_address, None) if info == "server_addr": return self._stream.extra(anyio.abc.SocketAttribute.remote_address, None) if info == "socket": return self._stream.extra(anyio.abc.SocketAttribute.raw_socket, None) if info == "is_readable": sock = self._stream.extra(anyio.abc.SocketAttribute.raw_socket, None) return is_socket_readable(sock) return None class AsyncIOBackend(AsyncNetworkBackend): async def connect_tcp( self, host: str, port: int, timeout: typing.Optional[float] = None, local_address: typing.Optional[str] = None, ) -> AsyncNetworkStream: exc_map = { TimeoutError: ConnectTimeout, OSError: ConnectError, anyio.BrokenResourceError: ConnectError, } with map_exceptions(exc_map): with anyio.fail_after(timeout): stream: anyio.abc.ByteStream = await anyio.connect_tcp( remote_host=host, remote_port=port, local_host=local_address, ) return AsyncIOStream(stream) async def connect_unix_socket( self, path: str, timeout: typing.Optional[float] = None ) -> AsyncNetworkStream: # pragma: nocover exc_map = { TimeoutError: ConnectTimeout, OSError: ConnectError, anyio.BrokenResourceError: ConnectError, } with map_exceptions(exc_map): with anyio.fail_after(timeout): stream: anyio.abc.ByteStream = await anyio.connect_unix(path) return AsyncIOStream(stream) async def sleep(self, seconds: float) -> None: await anyio.sleep(seconds) # pragma: nocover