add manage.py command to extract derivatives, fixes #783

pandora/archive/management/commands/extract_derivatives.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+from django.core.management.base import BaseCommand
+from django.conf import settings
+import os
+
+import monkey_patch.models
+from ... import models
+from ...tasks import extract_derivatives
+
+class Command(BaseCommand):
+    """
+    """
+    help = 'extract derivatives, run this to recreate all derivatives. i.e after adding new resolutions'
+    args = ''
+    option_list = BaseCommand.option_list + (
+        make_option('--rebuild', action='store_true', dest='rebuild',
+            default=False, help='reencode all derivatives again'),
+        make_option('--forground', action='store_true', dest='forground',
+            default=False, help='dont dispatch encoding to celery but run in forground'),
+    )
+    def handle(self, **options):
+        for s in models.Stream.objects.filter(source=None):
+            if options['forground']:
+                extract_derivatives(s.item.id, options['rebuild'])
+            else:
+                extract_derivatives.delay(s.item.id, options['rebuild'])