delete old cached map tiles

src/c3nav/mapdata/models/update.py

@@ -7,6 +7,8 @@ from django.utils.http import int_to_base36
 from django.utils.timezone import make_naive
 from django.utils.translation import ugettext_lazy as _
 
+from c3nav.mapdata.tasks import delete_old_cached_tiles
+
 
 class MapUpdate(models.Model):
     """
@@ -51,6 +53,6 @@ class MapUpdate(models.Model):
         from c3nav.mapdata.render.base import LevelGeometries
         AltitudeArea.recalculate()
         LevelGeometries.rebuild()
-
         super().save(**kwargs)
         cache.set('mapdata:last_update', (self.pk, self.datetime), 900)
+        delete_old_cached_tiles.apply_async(countdown=5)

src/c3nav/mapdata/tasks.py

@@ -0,0 +1,17 @@
+import os
+from django.conf import settings
+
+from c3nav.celery import app
+
+
+@app.task()
+def delete_old_cached_tiles(*args, **kwargs):
+    from c3nav.mapdata.models import MapUpdate
+    cache_key = MapUpdate.cache_key()
+
+    for folder in os.listdir(settings.TILES_ROOT):
+        if folder == cache_key:
+            continue
+        fullpath = os.path.join(settings.TILES_ROOT, folder)
+        if os.path.isdir(fullpath):
+            os.system('rm -rf '+fullpath)