Finished feature better-service-category-endpoint-performance.

inventory_provider/routes/poller.py

 import json
 
-from flask import Blueprint, Response, jsonify
+from flask import Blueprint, Response, jsonify, current_app
 from lxml import etree
 from inventory_provider import juniper
 from inventory_provider.routes import common
@@ -88,10 +88,12 @@ def poller_interface_oids(hostname):
 @common.require_accepts_json
 def service_category_interfaces(category):
 
-    def _interfaces(rc, cat):
-        for k in rc.scan_iter(f'interface-services:{cat}:*'):
-            cached_ifc = rc.get(k.decode('utf-8')).decode('utf-8')
-            cached_ifc = json.loads(cached_ifc)
+    def _interfaces(cat):
+        config_params = current_app.config['INVENTORY_PROVIDER_CONFIG']
+        for doc in common.load_json_docs(
+                config_params=config_params,
+                key_pattern=f'interface-services:{cat}:*'):
+            cached_ifc = doc['value']
             basic_ifc_info = dict()
             for k in ['description', 'interface', 'router']:
                 basic_ifc_info[k] = cached_ifc[k]
@@ -110,15 +112,17 @@ def service_category_interfaces(category):
     result = r.get(cache_key)
 
     if result:
-        result = json.loads(result.decode('utf-8'))
+        result = result.decode('utf-8')
     else:
-        result = list(_interfaces(r, category))
-        if result:
-            r.set(cache_key, json.dumps(result).encode('utf-8'))
-        else:
+        result = list(_interfaces(category))
+        if not result:
             return Response(
                 response=f'no info available for service category {category}',
                 status=404,
                 mimetype="text/html")
 
-    return jsonify(result)
+        result = json.dumps(result)
+        # cache this data for the next call
+        r.set(cache_key, result.encode('utf-8'))
+
+    return Response(result, mimetype="application/json")