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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import datetime
import logging
from celery import Celery
from kombu import Exchange, Queue
from mediagoblin.tools.pluginapi import hook_runall
_log = logging.getLogger(__name__)
MANDATORY_CELERY_IMPORTS = [
'mediagoblin.processing.task',
'mediagoblin.notifications.task',
'mediagoblin.submit.task',
'mediagoblin.media_types.video.processing',
]
DEFAULT_SETTINGS_MODULE = 'mediagoblin.init.celery.dummy_settings_module'
def get_celery_settings_dict(app_config, global_config,
force_celery_always_eager=False):
"""
Get a celery settings dictionary from reading the config
"""
if 'celery' in global_config:
celery_conf = global_config['celery']
else:
celery_conf = {}
# Add x-max-priority to config
celery_conf['CELERY_QUEUES'] = (
Queue('default', Exchange('default'), routing_key='default',
queue_arguments={'x-max-priority': 10}),
)
celery_settings = {}
# Add all celery settings from config
for key, value in celery_conf.items():
celery_settings[key] = value
# TODO: use default result stuff here if it exists
# add mandatory celery imports
celery_imports = celery_settings.setdefault('CELERY_IMPORTS', [])
celery_imports.extend(MANDATORY_CELERY_IMPORTS)
if force_celery_always_eager:
celery_settings['CELERY_ALWAYS_EAGER'] = True
celery_settings['CELERY_EAGER_PROPAGATES_EXCEPTIONS'] = True
# Garbage collection periodic task
frequency = app_config.get('garbage_collection', 60)
if frequency:
frequency = int(frequency)
celery_settings['CELERYBEAT_SCHEDULE'] = {
'garbage-collection': {
'task': 'mediagoblin.submit.task.collect_garbage',
'schedule': datetime.timedelta(minutes=frequency),
}
}
return celery_settings
def setup_celery_app(app_config, global_config,
settings_module=DEFAULT_SETTINGS_MODULE,
force_celery_always_eager=False):
"""
Setup celery without using terrible setup-celery-module hacks.
"""
celery_settings = get_celery_settings_dict(
app_config, global_config, force_celery_always_eager)
celery_app = Celery()
celery_app.config_from_object(celery_settings)
hook_runall('celery_setup', celery_app)
def setup_celery_from_config(app_config, global_config,
settings_module=DEFAULT_SETTINGS_MODULE,
force_celery_always_eager=False,
set_environ=True):
"""
Take a mediagoblin app config and try to set up a celery settings
module from this.
Args:
- app_config: the application config section
- global_config: the entire ConfigObj loaded config, all sections
- settings_module: the module to populate, as a string
- force_celery_always_eager: whether or not to force celery into
always eager mode; good for development and small installs
- set_environ: if set, this will CELERY_CONFIG_MODULE to the
settings_module
"""
celery_settings = get_celery_settings_dict(
app_config, global_config, force_celery_always_eager)
__import__(settings_module)
this_module = sys.modules[settings_module]
for key, value in celery_settings.items():
setattr(this_module, key, value)
if set_environ:
os.environ['CELERY_CONFIG_MODULE'] = settings_module
# Replace the default celery.current_app.conf if celery has already been
# initiated
from celery import current_app
_log.info('Setting celery configuration from object "{}"'.format(
settings_module))
current_app.config_from_object(this_module)
_log.debug('Celery broker host: {}'.format(current_app.conf['BROKER_HOST']))
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