add statssnapshot

src/c3nav/mapdata/utils/cache/stats.py

@@ -1,4 +1,5 @@
 from django.core.cache import cache
+from django.utils import timezone
 
 
 def increment_cache_key(cache_key):
@@ -6,3 +7,21 @@ def increment_cache_key(cache_key):
         cache.incr(cache_key)
     except ValueError:
         cache.set(cache_key, 0, None)
+
+
+def stats_snapshot(reset=True):
+    last_now = cache.get('apistats_last_reset', '', None)
+    now = timezone.now()
+    results = {}
+    for key in cache.keys('apistats__*'):
+        results[key] = cache.get(key)
+        if reset:
+            cache.delete(key)
+    if reset:
+        cache.set('apistats_last_reset', now, None)
+    results = dict(sorted(results.items()))
+    return {
+        'start_time': str(last_now),
+        'end_time': str(now),
+        'data': results
+    }