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Mini Shell
Mini Shell
import asyncio
import signal
import socket
from abc import ABC, abstractmethod
from typing import Any, List, Optional, Set
from yarl import URL
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", "_shutdown_timeout", "_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")
self._runner = runner
self._shutdown_timeout = shutdown_timeout
self._ssl_context = ssl_context
self._backlog = backlog
self._server = None # type: Optional[asyncio.AbstractServer]
@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 None:
self._runner._unreg_site(self)
return # not started yet
self._server.close()
# named pipes do not have wait_closed property
if hasattr(self._server, "wait_closed"):
await self._server.wait_closed()
await self._runner.shutdown()
assert self._runner.server
await self._runner.server.shutdown(self._shutdown_timeout)
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: str,
*,
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__ = ("_handle_signals", "_kwargs", "_server", "_sites")
def __init__(self, *, handle_signals: bool = False, **kwargs: Any) -> None:
self._handle_signals = handle_signals
self._kwargs = kwargs
self._server = None # type: Optional[Server]
self._sites = [] # type: List[BaseSite]
@property
def server(self) -> Optional[Server]:
return self._server
@property
def addresses(self) -> List[Any]:
ret = [] # type: List[Any]
for site in self._sites:
server = site._server
if server is not None:
sockets = server.sockets
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:
pass # pragma: no cover
async def cleanup(self) -> None:
loop = asyncio.get_event_loop()
# 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()
await self._cleanup_server()
self._server = None
if self._handle_signals:
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