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-rw-r--r--mediagoblin/processing.py154
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diff --git a/mediagoblin/processing.py b/mediagoblin/processing.py
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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.db.util import ObjectId, atomic_update
-from mediagoblin import mg_globals as mgg
-
-from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
-
-from mediagoblin.media_types import get_media_manager
-
-_log = logging.getLogger(__name__)
-
-THUMB_SIZE = 180, 180
-MEDIUM_SIZE = 640, 640
-
-
-def create_pub_filepath(entry, filename):
- return mgg.public_store.get_unique_filepath(
- ['media_entries',
- unicode(entry._id),
- filename])
-
-
-################################
-# Media processing initial steps
-################################
-
-class ProcessMedia(Task):
- """
- DEPRECATED -- This now resides in the individual media plugins
-
- 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 = mgg.database.MediaEntry.one(
- {'_id': ObjectId(media_id)})
-
- # Try to process, and handle expected errors.
- try:
- #__import__(entry.media_type)
- manager = get_media_manager(entry.media_type)
- _log.debug('Processing {0}'.format(entry))
- manager['processor'](entry)
- except BaseProcessingFail, exc:
- mark_entry_failed(entry._id, exc)
- return
- except ImportError, exc:
- _log.error(
- 'Entry {0} failed to process due to an import error: {1}'\
- .format(
- entry.title,
- exc))
-
- mark_entry_failed(entry._id, exc)
-
- entry.state = u'processed'
- entry.save()
-
- 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)
-
-
-def mark_entry_failed(entry_id, exc):
- """
- Mark a media entry as having failed in its conversion.
-
- Uses the exception that was raised to mark more information. If
- the exception is a derivative of BaseProcessingFail then we can
- store extra information that can be useful for users telling them
- why their media failed to process.
-
- Args:
- - entry_id: The id of the media entry
-
- """
- # Was this a BaseProcessingFail? In other words, was this a
- # type of error that we know how to handle?
- if isinstance(exc, BaseProcessingFail):
- # Looks like yes, so record information about that failure and any
- # metadata the user might have supplied.
- atomic_update(mgg.database.MediaEntry,
- {'_id': entry_id},
- {u'state': u'failed',
- u'fail_error': exc.exception_path,
- u'fail_metadata': exc.metadata})
- else:
- _log.warn("No idea what happened here, but it failed: %r", exc)
- # Looks like no, so just mark it as failed and don't record a
- # failure_error (we'll assume it wasn't handled) and don't record
- # metadata (in fact overwrite it if somehow it had previous info
- # here)
- atomic_update(mgg.database.MediaEntry,
- {'_id': entry_id},
- {u'state': u'failed',
- u'fail_error': None,
- u'fail_metadata': {}})
-
-
-class BaseProcessingFail(Exception):
- """
- Base exception that all other processing failure messages should
- subclass from.
-
- You shouldn't call this itself; instead you should subclass it
- and provid the exception_path and general_message applicable to
- this error.
- """
- general_message = u''
-
- @property
- def exception_path(self):
- return u"%s:%s" % (
- self.__class__.__module__, self.__class__.__name__)
-
- def __init__(self, **metadata):
- self.metadata = metadata or {}
-
-
-class BadMediaFail(BaseProcessingFail):
- """
- Error that should be raised when an inappropriate file was given
- for the media type specified.
- """
- general_message = _(u'Invalid file given for media type.')