From abf9d43a8cccd748da73817654e8edba172a678d Mon Sep 17 00:00:00 2001
From: Martin Dimitrov <martin3dimitrov@gmail.com>
Date: Sat, 11 Oct 2025 15:45:03 -0700
Subject: [PATCH] add a fail fast watermark so we can see if a response is fail
 fast

---
 packages/doorman-client/src/functions/buzzer-activated.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/doorman-client/src/functions/buzzer-activated.ts b/packages/doorman-client/src/functions/buzzer-activated.ts
index 85277e6..ceee32f 100644
--- a/packages/doorman-client/src/functions/buzzer-activated.ts
+++ b/packages/doorman-client/src/functions/buzzer-activated.ts
@@ -19,6 +19,8 @@ import { getMetricFromRegistry, withMetrics } from '../../../doorman-api/src/com
 import { Counter, Summary } from 'prom-client';
 import { BuzzerActivatedMetrics, registerMetrics } from '../metrics/BuzzerActivatedMetrics';
 
+const XML_FAIL_FAST_CALLBACK_COMMENT = "<!-- This response is from a fail fast callback -->";
+
 export const handler: ServerlessFunctionSignature<TwilioContext, BuzzerDialEvent> = withMetrics('buzzer-activated', async function (context, event, callback, metricsRegistry, logger, failFastCallback) {
   // metrics
   registerMetrics(metricsRegistry);
@@ -74,6 +76,7 @@ export const handler: ServerlessFunctionSignature<TwilioContext, BuzzerDialEvent
 
   await notifyDiscord(context, msgs, config.discordUsers, config.discordUsers.map(() => ""), metricsRegistry);
 
+  // set me to true to simulate a timeout
   let responseLock = false;
   let intervals: Timer[] = [];
   let timeouts: Timer[] = [];
@@ -167,6 +170,7 @@ export const handler: ServerlessFunctionSignature<TwilioContext, BuzzerDialEvent
     console.log(
       invokeId + " UngracefulFallback: Cutting it too close to timeout! Skipping notifying users and responding fallback"
     );
+    twiml.play(XML_FAIL_FAST_CALLBACK_COMMENT);
     return [null, twiml];
   });