Implement web server metrics in Tornado #3

server/handlers/api/alerts.py

@@ -5,16 +5,24 @@ from datetime import datetime
 import pytz
 import tornado
 
+from core.prometheus_metrics_handler import api_requests_counter
 from core.utils import serialize_everything
 
 
 # API request handler for /api/v1/alerts
 class APIAlertsHandler(tornado.web.RequestHandler):
-    def initialize(self, alerts):
+    def initialize(self, alerts, web_server_metrics):
         self.alerts = alerts
+        self.web_server_metrics = web_server_metrics
 
     def get(self):
         try:
+            # Metrics
+            self.web_server_metrics["last_api_access_time"] = datetime.now(pytz.UTC)
+            self.web_server_metrics["api_access_counter"] += 1
+            self.web_server_metrics["status"] = "OK"
+            api_requests_counter.inc()
+
             # request.arguments contains lists for each param key because technically the client can supply multiple,
             # reduce that to just the first entry, and convert bytes to string
             query_params = {k: v[0].decode("utf-8") for k, v in self.request.arguments.items()}
@@ -39,6 +47,9 @@ class APIAlertsStreamHandler(tornado.web.RequestHandler):
     def get(self):
         # todo
         # try:
+        #     # Metrics
+        #     api_requests_counter.inc()
+        #
         #     response.content_type  = 'text/event-stream'
         #     response.cache_control = 'no-cache'
         #     yield 'retry: 1000\n\n'