add metrics to auth route

packages/doorman-api/.env.example

@@ -8,3 +8,9 @@ AWS_SECRET_ACCESS_KEY=
 
 # discord notifs
 DISCORD_BOT_TOKEN=
+
+# metrics
+PUSHGATEWAY_URL=https://metrics.chromart.cc
+STAGE=prod
+PUSHGATEWAY_USER=doorman
+PUSHGATEWAY_PW=doormanmetrics

packages/doorman-api/src/functions/api/door/auth.ts

@@ -4,12 +4,15 @@
 
 import { ServerlessEventObject, ServerlessFunctionSignature } from "@twilio-labs/serverless-runtime-types/types";
 import { TwilioContext } from "../../../types/TwilioContext";
-import { shouldBlockRequest, UserAgentHeader } from "../../../utils/blockUserAgent";
+import { UserAgentHeader } from "../../../utils/blockUserAgent";
 import { clearLockStatusCommand, createDDBClient, ddbItemToJSON, getDoorConfigCommand, getLockStatusCommand, isLockOpen, setLockStatusCommand } from "../../../utils/ddb";
 import { DoorConfig } from "../../../types/DoorConfig";
 import { AuthMethod } from "../../../types/AuthMethod";
 import { Lock } from "../../../types/Lock";
 import { DoorStatus } from "../../../types/DoorStatus";
+import { getMetricFromRegistry, withMetrics } from "../../../common/DoormanHandler";
+import { AuthMetrics, registerMetrics } from "../../../metrics/AuthMetrics";
+import { Counter } from "prom-client";
 
 export interface AuthRequest extends ServerlessEventObject<{}, UserAgentHeader> {
   door?: string;
@@ -18,13 +21,10 @@ export interface AuthRequest extends ServerlessEventObject<{}, UserAgentHeader>
   timeout?: string;
 }
 
-export const handler: ServerlessFunctionSignature<TwilioContext, AuthRequest> = async function(context, event, callback) {
+export const handler: ServerlessFunctionSignature<TwilioContext, AuthRequest> = withMetrics('auth', async (context, event, callback, metricsRegistry) => {
   const response = new Twilio.Response();
 
-  if (shouldBlockRequest(event)) {
-    response.setStatusCode(200);
-    return callback(null, response);
-  }
+  registerMetrics(metricsRegistry);
 
   let door = event.door;
   let pin = event.key;
@@ -40,6 +40,7 @@ export const handler: ServerlessFunctionSignature<TwilioContext, AuthRequest> =
   const config: DoorConfig = ddbItemToJSON<DoorConfig>(ddbConfig);
 
   if (!config) {
+    getMetricFromRegistry<Counter>(metricsRegistry, AuthMetrics.DOOR_CONFIG_NOT_FOUND).inc({ door }, 1);
     response.setStatusCode(404);
     return callback(null, response);
   }
@@ -62,6 +63,9 @@ export const handler: ServerlessFunctionSignature<TwilioContext, AuthRequest> =
     return callback(null, response);
   }
 
+  getMetricFromRegistry<Counter>(metricsRegistry, AuthMetrics.AUTH_METHOD)
+    .inc({ method }, 1);
+
   const fingerprint = { 
     method,
     userAgent: event.request.headers['user-agent'],
@@ -109,4 +113,4 @@ export const handler: ServerlessFunctionSignature<TwilioContext, AuthRequest> =
 
   await client.destroy();
   return callback(null, response);
-};
+});

packages/doorman-api/src/metrics/AuthMetrics.ts

@@ -0,0 +1,20 @@
+import { Counter, Registry, Summary } from "prom-client";
+
+export enum AuthMetrics {
+  DOOR_CONFIG_NOT_FOUND = "DoorConfigNotFound",
+  AUTH_METHOD = "AuthMethod",
+}
+
+export const registerMetrics = (metricsRegistry: Registry) => {
+  metricsRegistry.registerMetric(new Counter({
+    name: AuthMetrics.DOOR_CONFIG_NOT_FOUND,
+    help: "Auth was attempted on a door that does not exist",
+    labelNames: ["door"],
+  }));
+
+  metricsRegistry.registerMetric(new Counter({
+    name: AuthMetrics.AUTH_METHOD,
+    help: "Which auth method was used",
+    labelNames: ["method"],
+  }));
+}

packages/doorman-api/src/types/TwilioContext.ts

@@ -1,6 +1,6 @@
-import { EnvironmentVariables } from "@twilio-labs/serverless-runtime-types/types";
+import { DoormanLambdaContext } from "../common/DoormanHandlerContext";
 
-export interface TwilioContext extends EnvironmentVariables {
+export interface TwilioContext extends DoormanLambdaContext {
   AWS_ACCESS_KEY: string;
   AWS_SECRET_ACCESS_KEY: string;
   DISCORD_BOT_TOKEN: string;