144 lines
4.7 KiB
Python
144 lines
4.7 KiB
Python
# GNU MediaGoblin -- federated, autonomous media hosting
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# Copyright (C) 2011 MediaGoblin contributors. See AUTHORS.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from celery.task import Task
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from mediagoblin.db.util import ObjectId
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from mediagoblin import mg_globals as mgg
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from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
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from mediagoblin.media_types import get_media_manager
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THUMB_SIZE = 180, 180
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MEDIUM_SIZE = 640, 640
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def create_pub_filepath(entry, filename):
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return mgg.public_store.get_unique_filepath(
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['media_entries',
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unicode(entry._id),
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filename])
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################################
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# Media processing initial steps
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################################
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class ProcessMedia(Task):
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"""
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DEPRECATED -- This now resides in the individual media plugins
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Pass this entry off for processing.
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"""
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def run(self, media_id):
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"""
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Pass the media entry off to the appropriate processing function
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(for now just process_image...)
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"""
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entry = mgg.database.MediaEntry.one(
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{'_id': ObjectId(media_id)})
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# Try to process, and handle expected errors.
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try:
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#__import__(entry.media_type)
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manager = get_media_manager(entry.media_type)
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manager['processor'](entry)
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except BaseProcessingFail, exc:
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mark_entry_failed(entry._id, exc)
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return
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except ImportError, exc:
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mark_entry_failed(entry[u'_id'], exc)
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entry.state = u'processed'
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entry.save()
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def on_failure(self, exc, task_id, args, kwargs, einfo):
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"""
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If the processing failed we should mark that in the database.
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Assuming that the exception raised is a subclass of
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BaseProcessingFail, we can use that to get more information
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about the failure and store that for conveying information to
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users about the failure, etc.
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"""
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entry_id = args[0]
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mark_entry_failed(entry_id, exc)
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def mark_entry_failed(entry_id, exc):
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"""
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Mark a media entry as having failed in its conversion.
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Uses the exception that was raised to mark more information. If
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the exception is a derivative of BaseProcessingFail then we can
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store extra information that can be useful for users telling them
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why their media failed to process.
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Args:
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- entry_id: The id of the media entry
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"""
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# Was this a BaseProcessingFail? In other words, was this a
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# type of error that we know how to handle?
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if isinstance(exc, BaseProcessingFail):
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# Looks like yes, so record information about that failure and any
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# metadata the user might have supplied.
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mgg.database['media_entries'].update(
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{'_id': entry_id},
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{'$set': {u'state': u'failed',
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u'fail_error': exc.exception_path,
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u'fail_metadata': exc.metadata}})
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else:
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# Looks like no, so just mark it as failed and don't record a
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# failure_error (we'll assume it wasn't handled) and don't record
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# metadata (in fact overwrite it if somehow it had previous info
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# here)
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mgg.database['media_entries'].update(
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{'_id': entry_id},
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{'$set': {u'state': u'failed',
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u'fail_error': None,
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u'fail_metadata': {}}})
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class BaseProcessingFail(Exception):
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"""
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Base exception that all other processing failure messages should
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subclass from.
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You shouldn't call this itself; instead you should subclass it
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and provid the exception_path and general_message applicable to
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this error.
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"""
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general_message = u''
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@property
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def exception_path(self):
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return u"%s:%s" % (
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self.__class__.__module__, self.__class__.__name__)
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def __init__(self, **metadata):
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self.metadata = metadata or {}
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class BadMediaFail(BaseProcessingFail):
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"""
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Error that should be raised when an inappropriate file was given
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for the media type specified.
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"""
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general_message = _(u'Invalid file given for media type.')
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