1 files changed, 143 insertions, 0 deletions
diff --git a/mediagoblin/processing.py b/mediagoblin/processing.py
new file mode 100644
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+++ b/mediagoblin/processing.py
@@ -0,0 +1,143 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011 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/>.
+
+from celery.task import Task
+
+from mediagoblin.db.util import ObjectId
+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
+
+
+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)
+            manager['processor'](entry)
+        except BaseProcessingFail, exc:
+            mark_entry_failed(entry._id, exc)
+            return
+        except ImportError, exc:
+            mark_entry_failed(entry[u'_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.
+        mgg.database['media_entries'].update(
+            {'_id': entry_id},
+            {'$set': {u'state': u'failed',
+                      u'fail_error': exc.exception_path,
+                      u'fail_metadata': exc.metadata}})
+    else:
+        # Looks like no, so just mark it as failed and don't record a
+        # failure_error (we'll assume it wasn't handled) and don't record
+        # metadata (in fact overwrite it if somehow it had previous info
+        # here)
+        mgg.database['media_entries'].update(
+            {'_id': entry_id},
+            {'$set': {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.')