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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 logging
from celery.task import Task
from mediagoblin import mg_globals as mgg
from mediagoblin.db.models import MediaEntry
from mediagoblin.processing import mark_entry_failed, BaseProcessingFail
from mediagoblin.tools.processing import json_processing_callback
_log = logging.getLogger(__name__)
logging.basicConfig()
_log.setLevel(logging.DEBUG)
################################
# Media processing initial steps
################################
class ProcessMedia(Task):
"""
Pass this entry off for processing.
"""
def run(self, media_id):
"""
Pass the media entry off to the appropriate processing function
(for now just process_image...)
"""
entry = MediaEntry.query.get(media_id)
# Try to process, and handle expected errors.
try:
entry.state = u'processing'
entry.save()
_log.debug('Processing {0}'.format(entry))
# run the processing code
entry.media_manager['processor'](entry)
# We set the state to processed and save the entry here so there's
# no need to save at the end of the processing stage, probably ;)
entry.state = u'processed'
entry.save()
json_processing_callback(entry)
except BaseProcessingFail as exc:
mark_entry_failed(entry.id, exc)
json_processing_callback(entry)
return
except ImportError as exc:
_log.error(
'Entry {0} failed to process due to an import error: {1}'\
.format(
entry.title,
exc))
mark_entry_failed(entry.id, exc)
json_processing_callback(entry)
except Exception as exc:
_log.error('An unhandled exception was raised while'
+ ' processing {0}'.format(
entry))
mark_entry_failed(entry.id, exc)
json_processing_callback(entry)
raise
def on_failure(self, exc, task_id, args, kwargs, einfo):
"""
If the processing failed we should mark that in the database.
Assuming that the exception raised is a subclass of
BaseProcessingFail, we can use that to get more information
about the failure and store that for conveying information to
users about the failure, etc.
"""
entry_id = args[0]
mark_entry_failed(entry_id, exc)
entry = mgg.database.MediaEntry.query.filter_by(id=entry_id).first()
json_processing_callback(entry)
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