1 files changed, 127 insertions, 0 deletions
diff --git a/mediagoblin/processing/__init__.py b/mediagoblin/processing/__init__.py
new file mode 100644
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+++ b/mediagoblin/processing/__init__.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
+import os
+
+from mediagoblin.db.util import atomic_update
+from mediagoblin import mg_globals as mgg
+
+from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
+
+_log = logging.getLogger(__name__)
+
+
+def create_pub_filepath(entry, filename):
+    return mgg.public_store.get_unique_filepath(
+            ['media_entries',
+             unicode(entry._id),
+             filename])
+
+class FilenameBuilder(object):
+    """Easily slice and dice filenames.
+
+    Initialize this class with an original file path, then use the fill()
+    method to create new filenames based on the original.
+
+    """
+    MAX_FILENAME_LENGTH = 255  # VFAT's maximum filename length
+
+    def __init__(self, path):
+        """Initialize a builder from an original file path."""
+        self.dirpath, self.basename = os.path.split(path)
+        self.basename, self.ext = os.path.splitext(self.basename)
+        self.ext = self.ext.lower()
+
+    def fill(self, fmtstr):
+        """Build a new filename based on the original.
+
+        The fmtstr argument can include the following:
+        {basename} -- the original basename, with the extension removed
+        {ext} -- the original extension, always lowercase
+
+        If necessary, {basename} will be truncated so the filename does not
+        exceed this class' MAX_FILENAME_LENGTH in length.
+
+        """
+        basename_len = (self.MAX_FILENAME_LENGTH -
+                        len(fmtstr.format(basename='', ext=self.ext)))
+        return fmtstr.format(basename=self.basename[:basename_len],
+                             ext=self.ext)
+
+
+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.')