/lib/python/celery/bin/base.py
Python | 392 lines | 329 code | 20 blank | 43 comment | 32 complexity | 81bb8b8a01b1e53ad1889e9132147fd0 MD5 | raw file
- # -*- coding: utf-8 -*-
- """
- .. _preload-options:
- Preload Options
- ---------------
- These options are supported by all commands,
- and usually parsed before command-specific arguments.
- .. cmdoption:: -A, --app
- app instance to use (e.g. module.attr_name)
- .. cmdoption:: -b, --broker
- url to broker. default is 'amqp://guest@localhost//'
- .. cmdoption:: --loader
- name of custom loader class to use.
- .. cmdoption:: --config
- Name of the configuration module
- .. _daemon-options:
- Daemon Options
- --------------
- These options are supported by commands that can detach
- into the background (daemon). They will be present
- in any command that also has a `--detach` option.
- .. cmdoption:: -f, --logfile
- Path to log file. If no logfile is specified, `stderr` is used.
- .. cmdoption:: --pidfile
- Optional file used to store the process pid.
- The program will not start if this file already exists
- and the pid is still alive.
- .. cmdoption:: --uid
- User id, or user name of the user to run as after detaching.
- .. cmdoption:: --gid
- Group id, or group name of the main group to change to after
- detaching.
- .. cmdoption:: --umask
- Effective umask of the process after detaching. Default is 0.
- .. cmdoption:: --workdir
- Optional directory to change to after detaching.
- """
- from __future__ import absolute_import
- import os
- import re
- import sys
- import warnings
- from collections import defaultdict
- from optparse import OptionParser, IndentedHelpFormatter, make_option as Option
- from types import ModuleType
- import celery
- from celery.exceptions import CDeprecationWarning, CPendingDeprecationWarning
- from celery.platforms import EX_FAILURE, EX_USAGE, maybe_patch_concurrency
- from celery.utils import text
- from celery.utils.imports import symbol_by_name, import_from_cwd
- # always enable DeprecationWarnings, so our users can see them.
- for warning in (CDeprecationWarning, CPendingDeprecationWarning):
- warnings.simplefilter('once', warning, 0)
- ARGV_DISABLED = """
- Unrecognized command line arguments: %s
- Try --help?
- """
- find_long_opt = re.compile(r'.+?(--.+?)(?:\s|,|$)')
- find_rst_ref = re.compile(r':\w+:`(.+?)`')
- class HelpFormatter(IndentedHelpFormatter):
- def format_epilog(self, epilog):
- if epilog:
- return '\n%s\n\n' % epilog
- return ''
- def format_description(self, description):
- return text.ensure_2lines(text.fill_paragraphs(
- text.dedent(description), self.width))
- class Command(object):
- """Base class for command line applications.
- :keyword app: The current app.
- :keyword get_app: Callable returning the current app if no app provided.
- """
- Parser = OptionParser
- #: Arg list used in help.
- args = ''
- #: Application version.
- version = celery.VERSION_BANNER
- #: If false the parser will raise an exception if positional
- #: args are provided.
- supports_args = True
- #: List of options (without preload options).
- option_list = ()
- # module Rst documentation to parse help from (if any)
- doc = None
- # Some programs (multi) does not want to load the app specified
- # (Issue #1008).
- respects_app_option = True
- #: List of options to parse before parsing other options.
- preload_options = (
- Option('-A', '--app', default=None),
- Option('-b', '--broker', default=None),
- Option('--loader', default=None),
- Option('--config', default=None),
- Option('--workdir', default=None, dest='working_directory'),
- )
- #: Enable if the application should support config from the cmdline.
- enable_config_from_cmdline = False
- #: Default configuration namespace.
- namespace = 'celery'
- #: Text to print at end of --help
- epilog = None
- #: Text to print in --help before option list.
- description = ''
- #: Set to true if this command doesn't have subcommands
- leaf = True
- def __init__(self, app=None, get_app=None):
- self.app = app
- self.get_app = get_app or self._get_default_app
- def run(self, *args, **options):
- """This is the body of the command called by :meth:`handle_argv`."""
- raise NotImplementedError('subclass responsibility')
- def execute_from_commandline(self, argv=None):
- """Execute application from command line.
- :keyword argv: The list of command line arguments.
- Defaults to ``sys.argv``.
- """
- if argv is None:
- argv = list(sys.argv)
- # Should we load any special concurrency environment?
- self.maybe_patch_concurrency(argv)
- self.on_concurrency_setup()
- # Dump version and exit if '--version' arg set.
- self.early_version(argv)
- argv = self.setup_app_from_commandline(argv)
- prog_name = os.path.basename(argv[0])
- return self.handle_argv(prog_name, argv[1:])
- def run_from_argv(self, prog_name, argv=None):
- return self.handle_argv(prog_name, sys.argv if argv is None else argv)
- def maybe_patch_concurrency(self, argv=None):
- argv = argv or sys.argv
- pool_option = self.with_pool_option(argv)
- if pool_option:
- maybe_patch_concurrency(argv, *pool_option)
- short_opts, long_opts = pool_option
- def on_concurrency_setup(self):
- pass
- def usage(self, command):
- """Returns the command line usage string for this app."""
- return '%%prog [options] %s' % (self.args, )
- def get_options(self):
- """Get supported command line options."""
- return self.option_list
- def expanduser(self, value):
- if isinstance(value, basestring):
- return os.path.expanduser(value)
- return value
- def handle_argv(self, prog_name, argv):
- """Parses command line arguments from ``argv`` and dispatches
- to :meth:`run`.
- :param prog_name: The program name (``argv[0]``).
- :param argv: Command arguments.
- Exits with an error message if :attr:`supports_args` is disabled
- and ``argv`` contains positional arguments.
- """
- options, args = self.prepare_args(*self.parse_options(prog_name, argv))
- return self.run(*args, **options)
- def prepare_args(self, options, args):
- if options:
- options = dict((k, self.expanduser(v))
- for k, v in vars(options).iteritems()
- if not k.startswith('_'))
- args = map(self.expanduser, args)
- self.check_args(args)
- return options, args
- def check_args(self, args):
- if not self.supports_args and args:
- self.die(ARGV_DISABLED % (', '.join(args, )), EX_USAGE)
- def die(self, msg, status=EX_FAILURE):
- sys.stderr.write(msg + '\n')
- sys.exit(status)
- def early_version(self, argv):
- if '--version' in argv:
- sys.stdout.write('%s\n' % self.version)
- sys.exit(0)
- def parse_options(self, prog_name, arguments):
- """Parse the available options."""
- # Don't want to load configuration to just print the version,
- # so we handle --version manually here.
- parser = self.create_parser(prog_name)
- return parser.parse_args(arguments)
- def create_parser(self, prog_name, command=None):
- return self.prepare_parser(self.Parser(
- prog=prog_name,
- usage=self.usage(command),
- version=self.version,
- epilog=self.epilog,
- formatter=HelpFormatter(),
- description=self.description,
- option_list=(self.preload_options + self.get_options())))
- def prepare_parser(self, parser):
- docs = [self.parse_doc(doc) for doc in (self.doc, __doc__) if doc]
- for doc in docs:
- for long_opt, help in doc.iteritems():
- option = parser.get_option(long_opt)
- if option is not None:
- option.help = ' '.join(help) % {'default': option.default}
- return parser
- def setup_app_from_commandline(self, argv):
- preload_options = self.parse_preload_options(argv)
- workdir = preload_options.get('working_directory')
- if workdir:
- os.chdir(workdir)
- app = (preload_options.get('app') or
- os.environ.get('CELERY_APP') or
- self.app)
- preload_loader = preload_options.get('loader')
- if preload_loader:
- # Default app takes loader from this env (Issue #1066).
- os.environ['CELERY_LOADER'] = preload_loader
- loader = (preload_loader,
- os.environ.get('CELERY_LOADER') or
- 'default')
- broker = preload_options.get('broker', None)
- if broker:
- os.environ['CELERY_BROKER_URL'] = broker
- config = preload_options.get('config')
- if config:
- os.environ['CELERY_CONFIG_MODULE'] = config
- if self.respects_app_option:
- if app and self.respects_app_option:
- self.app = self.find_app(app)
- elif self.app is None:
- self.app = self.get_app(loader=loader)
- if self.enable_config_from_cmdline:
- argv = self.process_cmdline_config(argv)
- else:
- self.app = celery.Celery()
- return argv
- def find_app(self, app):
- try:
- sym = self.symbol_by_name(app)
- except AttributeError:
- # last part was not an attribute, but a module
- sym = import_from_cwd(app)
- if isinstance(sym, ModuleType):
- if getattr(sym, '__path__', None):
- return self.find_app('%s.celery:' % (app.replace(':', ''), ))
- return sym.celery
- return sym
- def symbol_by_name(self, name):
- return symbol_by_name(name, imp=import_from_cwd)
- get_cls_by_name = symbol_by_name # XXX compat
- def process_cmdline_config(self, argv):
- try:
- cargs_start = argv.index('--')
- except ValueError:
- return argv
- argv, cargs = argv[:cargs_start], argv[cargs_start + 1:]
- self.app.config_from_cmdline(cargs, namespace=self.namespace)
- return argv
- def parse_preload_options(self, args):
- acc = {}
- opts = {}
- for opt in self.preload_options:
- for t in (opt._long_opts, opt._short_opts):
- opts.update(dict(zip(t, [opt.dest] * len(t))))
- index = 0
- length = len(args)
- while index < length:
- arg = args[index]
- if arg.startswith('--') and '=' in arg:
- key, value = arg.split('=', 1)
- dest = opts.get(key)
- if dest:
- acc[dest] = value
- elif arg.startswith('-'):
- dest = opts.get(arg)
- if dest:
- acc[dest] = args[index + 1]
- index += 1
- index += 1
- return acc
- def parse_doc(self, doc):
- options, in_option = defaultdict(list), None
- for line in doc.splitlines():
- if line.startswith('.. cmdoption::'):
- m = find_long_opt.match(line)
- if m:
- in_option = m.groups()[0].strip()
- assert in_option, 'missing long opt'
- elif in_option and line.startswith(' ' * 4):
- options[in_option].append(
- find_rst_ref.sub(r'\1', line.strip()).replace('`', ''))
- return options
- def with_pool_option(self, argv):
- """Returns tuple of ``(short_opts, long_opts)`` if the command
- supports a pool argument, and used to monkey patch eventlet/gevent
- environments as early as possible.
- E.g::
- has_pool_option = (['-P'], ['--pool'])
- """
- pass
- def _get_default_app(self, *args, **kwargs):
- from celery._state import get_current_app
- return get_current_app() # omit proxy
- def daemon_options(default_pidfile=None, default_logfile=None):
- return (
- Option('-f', '--logfile', default=default_logfile),
- Option('--pidfile', default=default_pidfile),
- Option('--uid', default=None),
- Option('--gid', default=None),
- Option('--umask', default=0, type='int'),
- )