mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-10 01:17:42 +01:00
252 lines
7.8 KiB
Python
252 lines
7.8 KiB
Python
"""Async gunicorn worker for aiohttp.web"""
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import asyncio
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import os
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import re
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import signal
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import sys
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from types import FrameType
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from typing import Any, Awaitable, Callable, Optional, Union # noqa
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from gunicorn.config import AccessLogFormat as GunicornAccessLogFormat
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from gunicorn.workers import base
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from aiohttp import web
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from .helpers import set_result
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from .web_app import Application
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from .web_log import AccessLogger
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try:
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import ssl
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SSLContext = ssl.SSLContext
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except ImportError: # pragma: no cover
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ssl = None # type: ignore
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SSLContext = object # type: ignore
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__all__ = ("GunicornWebWorker", "GunicornUVLoopWebWorker", "GunicornTokioWebWorker")
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class GunicornWebWorker(base.Worker):
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DEFAULT_AIOHTTP_LOG_FORMAT = AccessLogger.LOG_FORMAT
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DEFAULT_GUNICORN_LOG_FORMAT = GunicornAccessLogFormat.default
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def __init__(self, *args: Any, **kw: Any) -> None: # pragma: no cover
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super().__init__(*args, **kw)
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self._task = None # type: Optional[asyncio.Task[None]]
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self.exit_code = 0
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self._notify_waiter = None # type: Optional[asyncio.Future[bool]]
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def init_process(self) -> None:
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# create new event_loop after fork
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asyncio.get_event_loop().close()
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self.loop = asyncio.new_event_loop()
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asyncio.set_event_loop(self.loop)
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super().init_process()
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def run(self) -> None:
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self._task = self.loop.create_task(self._run())
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try: # ignore all finalization problems
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self.loop.run_until_complete(self._task)
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except Exception:
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self.log.exception("Exception in gunicorn worker")
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if sys.version_info >= (3, 6):
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self.loop.run_until_complete(self.loop.shutdown_asyncgens())
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self.loop.close()
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sys.exit(self.exit_code)
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async def _run(self) -> None:
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if isinstance(self.wsgi, Application):
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app = self.wsgi
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elif asyncio.iscoroutinefunction(self.wsgi):
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app = await self.wsgi()
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else:
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raise RuntimeError(
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"wsgi app should be either Application or "
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"async function returning Application, got {}".format(self.wsgi)
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)
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access_log = self.log.access_log if self.cfg.accesslog else None
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runner = web.AppRunner(
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app,
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logger=self.log,
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keepalive_timeout=self.cfg.keepalive,
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access_log=access_log,
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access_log_format=self._get_valid_log_format(self.cfg.access_log_format),
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)
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await runner.setup()
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ctx = self._create_ssl_context(self.cfg) if self.cfg.is_ssl else None
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runner = runner
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assert runner is not None
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server = runner.server
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assert server is not None
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for sock in self.sockets:
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site = web.SockSite(
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runner,
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sock,
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ssl_context=ctx,
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shutdown_timeout=self.cfg.graceful_timeout / 100 * 95,
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)
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await site.start()
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# If our parent changed then we shut down.
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pid = os.getpid()
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try:
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while self.alive: # type: ignore
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self.notify()
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cnt = server.requests_count
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if self.cfg.max_requests and cnt > self.cfg.max_requests:
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self.alive = False
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self.log.info("Max requests, shutting down: %s", self)
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elif pid == os.getpid() and self.ppid != os.getppid():
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self.alive = False
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self.log.info("Parent changed, shutting down: %s", self)
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else:
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await self._wait_next_notify()
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except BaseException:
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pass
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await runner.cleanup()
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def _wait_next_notify(self) -> "asyncio.Future[bool]":
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self._notify_waiter_done()
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loop = self.loop
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assert loop is not None
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self._notify_waiter = waiter = loop.create_future()
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self.loop.call_later(1.0, self._notify_waiter_done, waiter)
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return waiter
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def _notify_waiter_done(
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self, waiter: Optional["asyncio.Future[bool]"] = None
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) -> None:
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if waiter is None:
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waiter = self._notify_waiter
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if waiter is not None:
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set_result(waiter, True)
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if waiter is self._notify_waiter:
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self._notify_waiter = None
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def init_signals(self) -> None:
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# Set up signals through the event loop API.
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self.loop.add_signal_handler(
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signal.SIGQUIT, self.handle_quit, signal.SIGQUIT, None
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)
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self.loop.add_signal_handler(
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signal.SIGTERM, self.handle_exit, signal.SIGTERM, None
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)
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self.loop.add_signal_handler(
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signal.SIGINT, self.handle_quit, signal.SIGINT, None
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)
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self.loop.add_signal_handler(
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signal.SIGWINCH, self.handle_winch, signal.SIGWINCH, None
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)
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self.loop.add_signal_handler(
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signal.SIGUSR1, self.handle_usr1, signal.SIGUSR1, None
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)
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self.loop.add_signal_handler(
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signal.SIGABRT, self.handle_abort, signal.SIGABRT, None
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)
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# Don't let SIGTERM and SIGUSR1 disturb active requests
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# by interrupting system calls
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signal.siginterrupt(signal.SIGTERM, False)
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signal.siginterrupt(signal.SIGUSR1, False)
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def handle_quit(self, sig: int, frame: FrameType) -> None:
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self.alive = False
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# worker_int callback
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self.cfg.worker_int(self)
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# wakeup closing process
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self._notify_waiter_done()
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def handle_abort(self, sig: int, frame: FrameType) -> None:
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self.alive = False
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self.exit_code = 1
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self.cfg.worker_abort(self)
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sys.exit(1)
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@staticmethod
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def _create_ssl_context(cfg: Any) -> "SSLContext":
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"""Creates SSLContext instance for usage in asyncio.create_server.
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See ssl.SSLSocket.__init__ for more details.
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"""
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if ssl is None: # pragma: no cover
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raise RuntimeError("SSL is not supported.")
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ctx = ssl.SSLContext(cfg.ssl_version)
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ctx.load_cert_chain(cfg.certfile, cfg.keyfile)
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ctx.verify_mode = cfg.cert_reqs
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if cfg.ca_certs:
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ctx.load_verify_locations(cfg.ca_certs)
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if cfg.ciphers:
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ctx.set_ciphers(cfg.ciphers)
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return ctx
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def _get_valid_log_format(self, source_format: str) -> str:
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if source_format == self.DEFAULT_GUNICORN_LOG_FORMAT:
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return self.DEFAULT_AIOHTTP_LOG_FORMAT
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elif re.search(r"%\([^\)]+\)", source_format):
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raise ValueError(
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"Gunicorn's style options in form of `%(name)s` are not "
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"supported for the log formatting. Please use aiohttp's "
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"format specification to configure access log formatting: "
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"http://docs.aiohttp.org/en/stable/logging.html"
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"#format-specification"
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)
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else:
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return source_format
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class GunicornUVLoopWebWorker(GunicornWebWorker):
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def init_process(self) -> None:
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import uvloop
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# Close any existing event loop before setting a
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# new policy.
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asyncio.get_event_loop().close()
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# Setup uvloop policy, so that every
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# asyncio.get_event_loop() will create an instance
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# of uvloop event loop.
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asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
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super().init_process()
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class GunicornTokioWebWorker(GunicornWebWorker):
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def init_process(self) -> None: # pragma: no cover
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import tokio
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# Close any existing event loop before setting a
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# new policy.
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asyncio.get_event_loop().close()
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# Setup tokio policy, so that every
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# asyncio.get_event_loop() will create an instance
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# of tokio event loop.
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asyncio.set_event_loop_policy(tokio.EventLoopPolicy())
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super().init_process()
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