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web_runner.py
import asyncio import signal import socket import warnings from abc import ABC, abstractmethod from typing import Any, Awaitable, Callable, List, Optional, Set from yarl import URL from .typedefs import PathLike from .web_app import Application from .web_server import Server try: from ssl import SSLContext except ImportError: SSLContext = object # type: ignore[misc,assignment] __all__ = ( "BaseSite", "TCPSite", "UnixSite", "NamedPipeSite", "SockSite", "BaseRunner", "AppRunner", "ServerRunner", "GracefulExit", ) class GracefulExit(SystemExit): code = 1 def _raise_graceful_exit() -> None: raise GracefulExit() class BaseSite(ABC): __slots__ = ("_runner", "_ssl_context", "_backlog", "_server") def __init__( self, runner: "BaseRunner", *, shutdown_timeout: float = 60.0, ssl_context: Optional[SSLContext] = None, backlog: int = 128, ) -> None: if runner.server is None: raise RuntimeError("Call runner.setup() before making a site") if shutdown_timeout != 60.0: msg = "shutdown_timeout should be set on BaseRunner" warnings.warn(msg, DeprecationWarning, stacklevel=2) runner._shutdown_timeout = shutdown_timeout self._runner = runner self._ssl_context = ssl_context self._backlog = backlog self._server: Optional[asyncio.AbstractServer] = None @property @abstractmethod def name(self) -> str: pass # pragma: no cover @abstractmethod async def start(self) -> None: self._runner._reg_site(self) async def stop(self) -> None: self._runner._check_site(self) if self._server is not None: # Maybe not started yet self._server.close() self._runner._unreg_site(self) class TCPSite(BaseSite): __slots__ = ("_host", "_port", "_reuse_address", "_reuse_port") def __init__( self, runner: "BaseRunner", host: Optional[str] = None, port: Optional[int] = None, *, shutdown_timeout: float = 60.0, ssl_context: Optional[SSLContext] = None, backlog: int = 128, reuse_address: Optional[bool] = None, reuse_port: Optional[bool] = None, ) -> None: super().__init__( runner, shutdown_timeout=shutdown_timeout, ssl_context=ssl_context, backlog=backlog, ) self._host = host if port is None: port = 8443 if self._ssl_context else 8080 self._port = port self._reuse_address = reuse_address self._reuse_port = reuse_port @property def name(self) -> str: scheme = "https" if self._ssl_context else "http" host = "0.0.0.0" if self._host is None else self._host return str(URL.build(scheme=scheme, host=host, port=self._port)) async def start(self) -> None: await super().start() loop = asyncio.get_event_loop() server = self._runner.server assert server is not None self._server = await loop.create_server( server, self._host, self._port, ssl=self._ssl_context, backlog=self._backlog, reuse_address=self._reuse_address, reuse_port=self._reuse_port, ) class UnixSite(BaseSite): __slots__ = ("_path",) def __init__( self, runner: "BaseRunner", path: PathLike, *, shutdown_timeout: float = 60.0, ssl_context: Optional[SSLContext] = None, backlog: int = 128, ) -> None: super().__init__( runner, shutdown_timeout=shutdown_timeout, ssl_context=ssl_context, backlog=backlog, ) self._path = path @property def name(self) -> str: scheme = "https" if self._ssl_context else "http" return f"{scheme}://unix:{self._path}:" async def start(self) -> None: await super().start() loop = asyncio.get_event_loop() server = self._runner.server assert server is not None self._server = await loop.create_unix_server( server, self._path, ssl=self._ssl_context, backlog=self._backlog, ) class NamedPipeSite(BaseSite): __slots__ = ("_path",) def __init__( self, runner: "BaseRunner", path: str, *, shutdown_timeout: float = 60.0 ) -> None: loop = asyncio.get_event_loop() if not isinstance( loop, asyncio.ProactorEventLoop # type: ignore[attr-defined] ): raise RuntimeError( "Named Pipes only available in proactor" "loop under windows" ) super().__init__(runner, shutdown_timeout=shutdown_timeout) self._path = path @property def name(self) -> str: return self._path async def start(self) -> None: await super().start() loop = asyncio.get_event_loop() server = self._runner.server assert server is not None _server = await loop.start_serving_pipe( # type: ignore[attr-defined] server, self._path ) self._server = _server[0] class SockSite(BaseSite): __slots__ = ("_sock", "_name") def __init__( self, runner: "BaseRunner", sock: socket.socket, *, shutdown_timeout: float = 60.0, ssl_context: Optional[SSLContext] = None, backlog: int = 128, ) -> None: super().__init__( runner, shutdown_timeout=shutdown_timeout, ssl_context=ssl_context, backlog=backlog, ) self._sock = sock scheme = "https" if self._ssl_context else "http" if hasattr(socket, "AF_UNIX") and sock.family == socket.AF_UNIX: name = f"{scheme}://unix:{sock.getsockname()}:" else: host, port = sock.getsockname()[:2] name = str(URL.build(scheme=scheme, host=host, port=port)) self._name = name @property def name(self) -> str: return self._name async def start(self) -> None: await super().start() loop = asyncio.get_event_loop() server = self._runner.server assert server is not None self._server = await loop.create_server( server, sock=self._sock, ssl=self._ssl_context, backlog=self._backlog ) class BaseRunner(ABC): __slots__ = ( "shutdown_callback", "_handle_signals", "_kwargs", "_server", "_sites", "_shutdown_timeout", ) def __init__( self, *, handle_signals: bool = False, shutdown_timeout: float = 60.0, **kwargs: Any, ) -> None: self.shutdown_callback: Optional[Callable[[], Awaitable[None]]] = None self._handle_signals = handle_signals self._kwargs = kwargs self._server: Optional[Server] = None self._sites: List[BaseSite] = [] self._shutdown_timeout = shutdown_timeout @property def server(self) -> Optional[Server]: return self._server @property def addresses(self) -> List[Any]: ret: List[Any] = [] for site in self._sites: server = site._server if server is not None: sockets = server.sockets # type: ignore[attr-defined] if sockets is not None: for sock in sockets: ret.append(sock.getsockname()) return ret @property def sites(self) -> Set[BaseSite]: return set(self._sites) async def setup(self) -> None: loop = asyncio.get_event_loop() if self._handle_signals: try: loop.add_signal_handler(signal.SIGINT, _raise_graceful_exit) loop.add_signal_handler(signal.SIGTERM, _raise_graceful_exit) except NotImplementedError: # pragma: no cover # add_signal_handler is not implemented on Windows pass self._server = await self._make_server() @abstractmethod async def shutdown(self) -> None: """Call any shutdown hooks to help server close gracefully.""" async def cleanup(self) -> None: # The loop over sites is intentional, an exception on gather() # leaves self._sites in unpredictable state. # The loop guaranties that a site is either deleted on success or # still present on failure for site in list(self._sites): await site.stop() if self._server: # If setup succeeded self._server.pre_shutdown() await self.shutdown() if self.shutdown_callback: await self.shutdown_callback() await self._server.shutdown(self._shutdown_timeout) await self._cleanup_server() self._server = None if self._handle_signals: loop = asyncio.get_running_loop() try: loop.remove_signal_handler(signal.SIGINT) loop.remove_signal_handler(signal.SIGTERM) except NotImplementedError: # pragma: no cover # remove_signal_handler is not implemented on Windows pass @abstractmethod async def _make_server(self) -> Server: pass # pragma: no cover @abstractmethod async def _cleanup_server(self) -> None: pass # pragma: no cover def _reg_site(self, site: BaseSite) -> None: if site in self._sites: raise RuntimeError(f"Site {site} is already registered in runner {self}") self._sites.append(site) def _check_site(self, site: BaseSite) -> None: if site not in self._sites: raise RuntimeError(f"Site {site} is not registered in runner {self}") def _unreg_site(self, site: BaseSite) -> None: if site not in self._sites: raise RuntimeError(f"Site {site} is not registered in runner {self}") self._sites.remove(site) class ServerRunner(BaseRunner): """Low-level web server runner""" __slots__ = ("_web_server",) def __init__( self, web_server: Server, *, handle_signals: bool = False, **kwargs: Any ) -> None: super().__init__(handle_signals=handle_signals, **kwargs) self._web_server = web_server async def shutdown(self) -> None: pass async def _make_server(self) -> Server: return self._web_server async def _cleanup_server(self) -> None: pass class AppRunner(BaseRunner): """Web Application runner""" __slots__ = ("_app",) def __init__( self, app: Application, *, handle_signals: bool = False, **kwargs: Any ) -> None: super().__init__(handle_signals=handle_signals, **kwargs) if not isinstance(app, Application): raise TypeError( "The first argument should be web.Application " "instance, got {!r}".format(app) ) self._app = app @property def app(self) -> Application: return self._app async def shutdown(self) -> None: await self._app.shutdown() async def _make_server(self) -> Server: loop = asyncio.get_event_loop() self._app._set_loop(loop) self._app.on_startup.freeze() await self._app.startup() self._app.freeze() return self._app._make_handler(loop=loop, **self._kwargs) async def _cleanup_server(self) -> None: await self._app.cleanup()
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