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import ssl import typing import trio from .._exceptions import ( ConnectError, ConnectTimeout, ExceptionMapping, ReadError, ReadTimeout, WriteError, WriteTimeout, map_exceptions, ) from .base import AsyncNetworkBackend, AsyncNetworkStream class TrioStream(AsyncNetworkStream): def __init__(self, stream: trio.abc.Stream) -> None: self._stream = stream async def read( self, max_bytes: int, timeout: typing.Optional[float] = None ) -> bytes: timeout_or_inf = float("inf") if timeout is None else timeout exc_map: ExceptionMapping = { trio.TooSlowError: ReadTimeout, trio.BrokenResourceError: ReadError, trio.ClosedResourceError: ReadError, } with map_exceptions(exc_map): with trio.fail_after(timeout_or_inf): data: bytes = await self._stream.receive_some(max_bytes=max_bytes) return data async def write( self, buffer: bytes, timeout: typing.Optional[float] = None ) -> None: if not buffer: return timeout_or_inf = float("inf") if timeout is None else timeout exc_map: ExceptionMapping = { trio.TooSlowError: WriteTimeout, trio.BrokenResourceError: WriteError, trio.ClosedResourceError: WriteError, } with map_exceptions(exc_map): with trio.fail_after(timeout_or_inf): await self._stream.send_all(data=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: timeout_or_inf = float("inf") if timeout is None else timeout exc_map: ExceptionMapping = { trio.TooSlowError: ConnectTimeout, trio.BrokenResourceError: ConnectError, } ssl_stream = trio.SSLStream( self._stream, ssl_context=ssl_context, server_hostname=server_hostname, https_compatible=True, server_side=False, ) with map_exceptions(exc_map): try: with trio.fail_after(timeout_or_inf): await ssl_stream.do_handshake() except Exception as exc: # pragma: nocover await self.aclose() raise exc return TrioStream(ssl_stream) def get_extra_info(self, info: str) -> typing.Any: if info == "ssl_object" and isinstance(self._stream, trio.SSLStream): # Type checkers cannot see `_ssl_object` attribute because trio._ssl.SSLStream uses __getattr__/__setattr__. # Tracked at https://github.com/python-trio/trio/issues/542 return self._stream._ssl_object # type: ignore[attr-defined] if info == "client_addr": return self._get_socket_stream().socket.getsockname() if info == "server_addr": return self._get_socket_stream().socket.getpeername() if info == "socket": stream = self._stream while isinstance(stream, trio.SSLStream): stream = stream.transport_stream assert isinstance(stream, trio.SocketStream) return stream.socket if info == "is_readable": socket = self.get_extra_info("socket") return socket.is_readable() return None def _get_socket_stream(self) -> trio.SocketStream: stream = self._stream while isinstance(stream, trio.SSLStream): stream = stream.transport_stream assert isinstance(stream, trio.SocketStream) return stream class TrioBackend(AsyncNetworkBackend): async def connect_tcp( self, host: str, port: int, timeout: typing.Optional[float] = None, local_address: typing.Optional[str] = None, ) -> AsyncNetworkStream: timeout_or_inf = float("inf") if timeout is None else timeout exc_map: ExceptionMapping = { trio.TooSlowError: ConnectTimeout, trio.BrokenResourceError: ConnectError, OSError: ConnectError, } with map_exceptions(exc_map): with trio.fail_after(timeout_or_inf): stream: trio.abc.Stream = await trio.open_tcp_stream( host=host, port=port, local_address=local_address ) return TrioStream(stream) async def connect_unix_socket( self, path: str, timeout: typing.Optional[float] = None ) -> AsyncNetworkStream: # pragma: nocover timeout_or_inf = float("inf") if timeout is None else timeout exc_map: ExceptionMapping = { trio.TooSlowError: ConnectTimeout, trio.BrokenResourceError: ConnectError, OSError: ConnectError, } with map_exceptions(exc_map): with trio.fail_after(timeout_or_inf): stream: trio.abc.Stream = await trio.open_unix_socket(path) return TrioStream(stream) async def sleep(self, seconds: float) -> None: await trio.sleep(seconds) # pragma: nocover