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Mini Shell
Mini Shell
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()
Zerion Mini Shell 1.0