Added a redis cache for the template usage stats.

Cache expires every 10 minutes, but will help with the every 2 second query, especially when a job is running.
There is some clean up and qa to do for this yet

app/template_statistics/rest.py

@@ -1,14 +1,16 @@
 from flask import (
     Blueprint,
     jsonify,
-    request
-)
+    request,
+    current_app)
 
+from app import redis_store
 from app.dao.notifications_dao import (
     dao_get_template_usage,
     dao_get_last_template_usage)
+from app.dao.templates_dao import dao_get_templates_by_for_cache
 
-from app.schemas import notifications_filter_schema, NotificationWithTemplateSchema, notification_with_template_schema
+from app.schemas import notification_with_template_schema
 
 template_statistics = Blueprint('template-statistics',
                                 __name__,
@@ -30,7 +32,15 @@ def get_template_statistics_for_service_by_day(service_id):
             raise InvalidRequest(message, status_code=400)
     else:
         limit_days = None
-    stats = dao_get_template_usage(service_id, limit_days=limit_days)
+
+    if limit_days == 7:
+        stats = get_template_statistics_for_7_days(limit_days, service_id)
+        print(stats)
+    #     [(UUID('c2a331f8-e0b9-43de-9dd2-88300511a1d7'), 'Create with priority', 'sms', 1)]
+
+    else:
+        stats = dao_get_template_usage(service_id, limit_days=limit_days)
+        print(stats)
 
     def serialize(data):
         return {
@@ -52,3 +62,18 @@ def get_template_statistics_for_template_id(service_id, template_id):
         raise InvalidRequest(errors, status_code=404)
     data = notification_with_template_schema.dump(notification).data
     return jsonify(data=data)
+
+
+def get_template_statistics_for_7_days(limit_days, service_id):
+    cache_key = "{}-template-counter-limit-7-days".format(service_id)
+    template_stats_by_id = redis_store.get_all_from_hash(cache_key)
+    if not template_stats_by_id:
+        print("populate cache")
+        stats = dao_get_template_usage(service_id, limit_days=limit_days)
+        cache_values = dict([(x.template_id, x.count) for x in stats])
+        redis_store.set_hash_and_expire(cache_key, cache_values, current_app.config.get('EXPIRE_CACHE_IN_SECONDS', 600))
+        current_app.logger.info('use redis-client: {}'.format(cache_key))
+    else:
+        print("template_stats_by_id: {}".format(template_stats_by_id))
+        stats = dao_get_templates_by_for_cache(template_stats_by_id.items())
+    return stats