add heavy caching to mapdata api

src/c3nav/mapdata/management/commands/clearmapcache.py

@@ -0,0 +1,11 @@
+from django.core.management.base import BaseCommand
+
+from c3nav.mapdata.lastupdate import set_last_mapdata_update
+
+
+class Command(BaseCommand):
+    help = 'Clear the map cache (set last updated to now)'
+
+    def handle(self, *args, **options):
+        with set_last_mapdata_update():
+            pass

src/c3nav/mapdata/management/commands/loadmap.py

@@ -1,6 +1,7 @@
 from django.core.management.base import BaseCommand, CommandError
 from django.db import transaction
 
+from c3nav.mapdata.lastupdate import set_last_mapdata_update
 from c3nav.mapdata.packageio import MapdataReader
 
 
@@ -15,8 +16,9 @@ class Command(BaseCommand):
         reader = MapdataReader()
         reader.read_packages()
 
-        with transaction.atomic():
-            reader.apply_to_db()
-            print()
-            if not options['yes'] and input('Confirm (y/N): ') != 'y':
-                raise CommandError('Aborted.')
+        with set_last_mapdata_update():
+            with transaction.atomic():
+                reader.apply_to_db()
+                print()
+                if not options['yes'] and input('Confirm (y/N): ') != 'y':
+                    raise CommandError('Aborted.')