Add API caching, move calls out into its own modules for reuse.

evesde/eveapi/__init__.py

@@ -0,0 +1,43 @@
+from datetime import timedelta
+from django.utils.timezone import now
+from django.conf import settings
+from eveapi import EVEAPIConnection
+
+from evesde.models.cache import EVEAPICache
+
+
+class EVEAPICache(object):
+
+    def hash(self, data):
+        from hashlib import sha1
+        return sha1('-'.join(data)).hexdigest()
+
+    def store(self, host, path, params, doc, obj):
+        key = self.hash((host, path, str(params.items())))
+        cached = now() + timedelta(seconds=obj.cachedUntil - obj.currentTime)
+
+        try:
+            obj = EVEAPICache.objects.get(key=key)
+        except EVEAPICache.DoesNotExist:
+            EVEAPICache.objects.create(key=key, cache_until=cached, document=doc)
+        else:
+            obj.cache_until = cached
+            obj.document = doc
+            obj.save()
+
+    def retrieve(self, host, path, params):
+        key = self.hash((host, path, str(params.items())))
+        try:
+            obj = EVEAPICache.objects.get(key=key)
+        except EVEAPICache.DoesNotExist:
+            pass
+        else:
+            if obj.cache_until >= now():
+                return obj.document
+        return None
+
+
+def get_api_connection():
+    cache_handler = getattr(settings, 'EVE_SDE_CACHE_HANDLER', 'evesde.eveapi.EVEAPICache')
+
+    return EVEAPIConnection(cacheHandler=cache_obj)