finally fix redis

app/status/views/healthcheck.py

@@ -1,7 +1,12 @@
+import time
+import traceback
+
 from flask import current_app, jsonify, request
 from notifications_python_client.errors import HTTPError
+from redis import RedisError
 
 from app import status_api_client, version
+from app.extensions import redis_client
 from app.status import status
 
 
@@ -12,11 +17,49 @@ def show_status():
     else:
         try:
             api_status = status_api_client.get_status()
-        except HTTPError as e:
+        except HTTPError as err:
             current_app.logger.exception("API failed to respond")
-            return jsonify(status="error", message=str(e.message)), 500
+            return jsonify(status="error", message=str(err.message)), 500
         return jsonify(
             status="ok",
             api=api_status,
             git_commit=version.__git_commit__,
             build_time=version.__time__), 200
+
+
+@status.route('/_status/redis', methods=['GET'])
+def show_redis_status():
+    try:
+        try:
+            api_status = {"error": "unexpected error"}
+            redis_uri = current_app.config['REDIS_URL']
+            current_app.logger.info(f"config['REDIS_URL']: {redis_uri}")
+            redis_enabled = current_app.config['REDIS_ENABLED']
+            current_app.logger.info(f"config['REDIS_ENABLED']: {redis_enabled}")
+            if redis_enabled:
+                current_app.logger.info("config['REDIS_ENABLED'] evaluates as True")
+
+            try:
+                now = time.time()
+                redis_client.set('mytestkey', now)
+                val = redis_client.get('mytestkey')
+                current_app.logger.info(f"Retrieved value from redis for mytestkey is: {val}")
+            except RedisError as err:
+                current_app.logger.exception(f"Redis service failed to respond with {err}")
+
+            api_status = status_api_client.get_count_of_live_services_and_organisations_cached()
+        except HTTPError as err:
+            current_app.logger.exception("API failed to respond")
+            return jsonify(status="error", message=str(err.message)), 500
+        return jsonify(
+            status="ok",
+            api=api_status,
+            git_commit=version.__git_commit__,
+            build_time=version.__time__), 200
+    except Exception as err:
+        current_app.logger.exception(F"Unhandled exception: {err} - {traceback.format_exc()}")
+        return jsonify(
+            status=f"error: {err}",
+            api=api_status,
+            git_commit=version.__git_commit__,
+            build_time=version.__time__), 500