GNXSOFT.COM
This commit is contained in:
Iliyan Angelov
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"""Worker command-line program.
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This module is the 'program-version' of :mod:`celery.worker`.
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It does everything necessary to run that module
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as an actual application, like installing signal handlers,
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platform tweaks, and so on.
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"""
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import logging
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import os
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import platform as _platform
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import sys
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from datetime import datetime
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from functools import partial
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from billiard.common import REMAP_SIGTERM
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from billiard.process import current_process
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from kombu.utils.encoding import safe_str
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from celery import VERSION_BANNER, platforms, signals
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from celery.app import trace
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from celery.loaders.app import AppLoader
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from celery.platforms import EX_FAILURE, EX_OK, check_privileges
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from celery.utils import static, term
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from celery.utils.debug import cry
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from celery.utils.imports import qualname
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from celery.utils.log import get_logger, in_sighandler, set_in_sighandler
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from celery.utils.text import pluralize
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from celery.worker import WorkController
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__all__ = ('Worker',)
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logger = get_logger(__name__)
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is_jython = sys.platform.startswith('java')
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is_pypy = hasattr(sys, 'pypy_version_info')
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ARTLINES = [
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' --------------',
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'--- ***** -----',
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'-- ******* ----',
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'- *** --- * ---',
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'- ** ----------',
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'- ** ----------',
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'- ** ----------',
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'- ** ----------',
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'- *** --- * ---',
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'-- ******* ----',
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'--- ***** -----',
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' --------------',
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]
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BANNER = """\
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{hostname} v{version}
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{platform} {timestamp}
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[config]
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.> app: {app}
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.> transport: {conninfo}
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.> results: {results}
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.> concurrency: {concurrency}
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.> task events: {events}
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[queues]
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{queues}
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"""
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EXTRA_INFO_FMT = """
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[tasks]
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{tasks}
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"""
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def active_thread_count():
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from threading import enumerate
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return sum(1 for t in enumerate()
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if not t.name.startswith('Dummy-'))
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def safe_say(msg):
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print(f'\n{msg}', file=sys.__stderr__, flush=True)
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class Worker(WorkController):
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"""Worker as a program."""
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def on_before_init(self, quiet=False, **kwargs):
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self.quiet = quiet
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trace.setup_worker_optimizations(self.app, self.hostname)
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# this signal can be used to set up configuration for
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# workers by name.
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signals.celeryd_init.send(
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sender=self.hostname, instance=self,
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conf=self.app.conf, options=kwargs,
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)
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check_privileges(self.app.conf.accept_content)
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def on_after_init(self, purge=False, no_color=None,
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redirect_stdouts=None, redirect_stdouts_level=None,
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**kwargs):
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self.redirect_stdouts = self.app.either(
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'worker_redirect_stdouts', redirect_stdouts)
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self.redirect_stdouts_level = self.app.either(
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'worker_redirect_stdouts_level', redirect_stdouts_level)
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super().setup_defaults(**kwargs)
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self.purge = purge
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self.no_color = no_color
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self._isatty = sys.stdout.isatty()
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self.colored = self.app.log.colored(
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self.logfile,
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enabled=not no_color if no_color is not None else no_color
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)
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def on_init_blueprint(self):
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self._custom_logging = self.setup_logging()
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# apply task execution optimizations
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# -- This will finalize the app!
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trace.setup_worker_optimizations(self.app, self.hostname)
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def on_start(self):
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app = self.app
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super().on_start()
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# this signal can be used to, for example, change queues after
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# the -Q option has been applied.
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signals.celeryd_after_setup.send(
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sender=self.hostname, instance=self, conf=app.conf,
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)
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if self.purge:
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self.purge_messages()
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if not self.quiet:
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self.emit_banner()
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self.set_process_status('-active-')
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self.install_platform_tweaks(self)
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if not self._custom_logging and self.redirect_stdouts:
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app.log.redirect_stdouts(self.redirect_stdouts_level)
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# TODO: Remove the following code in Celery 6.0
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# This qualifies as a hack for issue #6366.
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warn_deprecated = True
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config_source = app._config_source
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if isinstance(config_source, str):
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# Don't raise the warning when the settings originate from
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# django.conf:settings
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warn_deprecated = config_source.lower() not in [
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'django.conf:settings',
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]
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if warn_deprecated:
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if app.conf.maybe_warn_deprecated_settings():
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logger.warning(
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"Please run `celery upgrade settings path/to/settings.py` "
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"to avoid these warnings and to allow a smoother upgrade "
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"to Celery 6.0."
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)
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def emit_banner(self):
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# Dump configuration to screen so we have some basic information
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# for when users sends bug reports.
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use_image = term.supports_images()
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if use_image:
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print(term.imgcat(static.logo()))
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print(safe_str(''.join([
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str(self.colored.cyan(
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' \n', self.startup_info(artlines=not use_image))),
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str(self.colored.reset(self.extra_info() or '')),
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])), file=sys.__stdout__, flush=True)
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def on_consumer_ready(self, consumer):
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signals.worker_ready.send(sender=consumer)
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logger.info('%s ready.', safe_str(self.hostname))
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def setup_logging(self, colorize=None):
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if colorize is None and self.no_color is not None:
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colorize = not self.no_color
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return self.app.log.setup(
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self.loglevel, self.logfile,
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redirect_stdouts=False, colorize=colorize, hostname=self.hostname,
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)
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def purge_messages(self):
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with self.app.connection_for_write() as connection:
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count = self.app.control.purge(connection=connection)
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if count: # pragma: no cover
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print(f"purge: Erased {count} {pluralize(count, 'message')} from the queue.\n", flush=True)
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def tasklist(self, include_builtins=True, sep='\n', int_='celery.'):
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return sep.join(
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f' . {task}' for task in sorted(self.app.tasks)
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if (not task.startswith(int_) if not include_builtins else task)
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)
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def extra_info(self):
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if self.loglevel is None:
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return
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if self.loglevel <= logging.INFO:
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include_builtins = self.loglevel <= logging.DEBUG
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tasklist = self.tasklist(include_builtins=include_builtins)
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return EXTRA_INFO_FMT.format(tasks=tasklist)
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def startup_info(self, artlines=True):
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app = self.app
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concurrency = str(self.concurrency)
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appr = '{}:{:#x}'.format(app.main or '__main__', id(app))
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if not isinstance(app.loader, AppLoader):
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loader = qualname(app.loader)
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if loader.startswith('celery.loaders'): # pragma: no cover
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loader = loader[14:]
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appr += f' ({loader})'
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if self.autoscale:
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max, min = self.autoscale
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concurrency = f'{{min={min}, max={max}}}'
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pool = self.pool_cls
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if not isinstance(pool, str):
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pool = pool.__module__
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concurrency += f" ({pool.split('.')[-1]})"
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events = 'ON'
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if not self.task_events:
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events = 'OFF (enable -E to monitor tasks in this worker)'
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banner = BANNER.format(
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app=appr,
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hostname=safe_str(self.hostname),
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timestamp=datetime.now().replace(microsecond=0),
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version=VERSION_BANNER,
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conninfo=self.app.connection().as_uri(),
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results=self.app.backend.as_uri(),
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concurrency=concurrency,
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platform=safe_str(_platform.platform()),
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events=events,
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queues=app.amqp.queues.format(indent=0, indent_first=False),
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).splitlines()
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# integrate the ASCII art.
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if artlines:
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for i, _ in enumerate(banner):
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try:
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banner[i] = ' '.join([ARTLINES[i], banner[i]])
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except IndexError:
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banner[i] = ' ' * 16 + banner[i]
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return '\n'.join(banner) + '\n'
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def install_platform_tweaks(self, worker):
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"""Install platform specific tweaks and workarounds."""
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if self.app.IS_macOS:
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self.macOS_proxy_detection_workaround()
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# Install signal handler so SIGHUP restarts the worker.
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if not self._isatty:
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# only install HUP handler if detached from terminal,
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# so closing the terminal window doesn't restart the worker
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# into the background.
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if self.app.IS_macOS:
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# macOS can't exec from a process using threads.
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# See https://github.com/celery/celery/issues#issue/152
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install_HUP_not_supported_handler(worker)
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else:
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install_worker_restart_handler(worker)
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install_worker_term_handler(worker)
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install_worker_term_hard_handler(worker)
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install_worker_int_handler(worker)
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install_cry_handler()
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install_rdb_handler()
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def macOS_proxy_detection_workaround(self):
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"""See https://github.com/celery/celery/issues#issue/161."""
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os.environ.setdefault('celery_dummy_proxy', 'set_by_celeryd')
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def set_process_status(self, info):
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return platforms.set_mp_process_title(
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'celeryd',
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info=f'{info} ({platforms.strargv(sys.argv)})',
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hostname=self.hostname,
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)
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def _shutdown_handler(worker, sig='TERM', how='Warm',
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callback=None, exitcode=EX_OK):
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def _handle_request(*args):
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with in_sighandler():
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from celery.worker import state
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if current_process()._name == 'MainProcess':
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if callback:
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callback(worker)
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safe_say(f'worker: {how} shutdown (MainProcess)')
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signals.worker_shutting_down.send(
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sender=worker.hostname, sig=sig, how=how,
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exitcode=exitcode,
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)
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setattr(state, {'Warm': 'should_stop',
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'Cold': 'should_terminate'}[how], exitcode)
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_handle_request.__name__ = str(f'worker_{how}')
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platforms.signals[sig] = _handle_request
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if REMAP_SIGTERM == "SIGQUIT":
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install_worker_term_handler = partial(
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_shutdown_handler, sig='SIGTERM', how='Cold', exitcode=EX_FAILURE,
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)
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else:
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install_worker_term_handler = partial(
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_shutdown_handler, sig='SIGTERM', how='Warm',
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)
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if not is_jython: # pragma: no cover
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install_worker_term_hard_handler = partial(
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_shutdown_handler, sig='SIGQUIT', how='Cold',
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exitcode=EX_FAILURE,
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)
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else: # pragma: no cover
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install_worker_term_handler = \
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install_worker_term_hard_handler = lambda *a, **kw: None
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def on_SIGINT(worker):
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safe_say('worker: Hitting Ctrl+C again will terminate all running tasks!')
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install_worker_term_hard_handler(worker, sig='SIGINT')
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if not is_jython: # pragma: no cover
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install_worker_int_handler = partial(
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_shutdown_handler, sig='SIGINT', callback=on_SIGINT,
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exitcode=EX_FAILURE,
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)
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else: # pragma: no cover
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def install_worker_int_handler(*args, **kwargs):
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pass
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def _reload_current_worker():
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platforms.close_open_fds([
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sys.__stdin__, sys.__stdout__, sys.__stderr__,
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])
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os.execv(sys.executable, [sys.executable] + sys.argv)
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def install_worker_restart_handler(worker, sig='SIGHUP'):
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def restart_worker_sig_handler(*args):
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"""Signal handler restarting the current python program."""
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set_in_sighandler(True)
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safe_say(f"Restarting celery worker ({' '.join(sys.argv)})")
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import atexit
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atexit.register(_reload_current_worker)
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from celery.worker import state
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state.should_stop = EX_OK
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platforms.signals[sig] = restart_worker_sig_handler
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def install_cry_handler(sig='SIGUSR1'):
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# PyPy does not have sys._current_frames
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if is_pypy: # pragma: no cover
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return
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def cry_handler(*args):
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"""Signal handler logging the stack-trace of all active threads."""
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with in_sighandler():
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safe_say(cry())
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platforms.signals[sig] = cry_handler
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def install_rdb_handler(envvar='CELERY_RDBSIG',
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sig='SIGUSR2'): # pragma: no cover
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def rdb_handler(*args):
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"""Signal handler setting a rdb breakpoint at the current frame."""
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with in_sighandler():
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from celery.contrib.rdb import _frame, set_trace
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# gevent does not pass standard signal handler args
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frame = args[1] if args else _frame().f_back
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set_trace(frame)
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if os.environ.get(envvar):
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platforms.signals[sig] = rdb_handler
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def install_HUP_not_supported_handler(worker, sig='SIGHUP'):
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def warn_on_HUP_handler(signum, frame):
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with in_sighandler():
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safe_say('{sig} not supported: Restarting with {sig} is '
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'unstable on this platform!'.format(sig=sig))
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platforms.signals[sig] = warn_on_HUP_handler
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