await transmission of discord notif request instead of waiting for it to complete

packages/doorman-client/functions/buzzer-activated.js

@@ -3,6 +3,29 @@
  */
 const { randomUUID } = require('crypto');
 const fetch = require('node-fetch');
+const https = require('https');
+const http = require('http');
+
+/**
+ * Helper function to do an HTTP request and just await transmission, but not await a response.
+ * ref: https://www.sensedeep.com/blog/posts/stories/lambda-fast-http.html
+ * @param {*} url - the URL to do HTTP request to
+ * @returns promise signalling HTTP request has been transmitted
+ */
+async function lambdaFastHttp(url) {
+  return new Promise((resolve, reject) => {
+    let req;
+
+    if (url.startsWith("https://")) {
+      req = https.request(URL.parse(url));
+    } else {
+      req = http.request(URL.parse(url));
+    }
+    req.end(null, null, () => {
+      resolve(req);
+    });
+  });
+}
 
 async function getConfig(context, buzzer) {
   return await fetch(context.DOORMAN_URL + `/api/door/info?buzzer=${buzzer}`)
@@ -12,13 +35,13 @@ async function getConfig(context, buzzer) {
     });
 }
 
-function notifyDiscord(context, msg, u, optionalJsonStr) {
-  return fetch(context.DOORMAN_URL + 
+async function notifyDiscord(context, msg, u, optionalJsonStr) {
+  return lambdaFastHttp(context.DOORMAN_URL + 
     `/api/door/notify?discordUser=${encodeURIComponent(JSON.stringify(u))}&msg=${encodeURIComponent(JSON.stringify(msg))}&json=${encodeURIComponent(JSON.stringify(optionalJsonStr))}`,
   ).catch(err => console.log(err))
 }
 
-function notifyAllDiscord(context, config, msg, optionalJsonStr) {
+async function notifyAllDiscord(context, config, msg, optionalJsonStr) {
   return notifyDiscord(context, config.discordUsers.map(() => msg), config.discordUsers, config.discordUsers.map(() => optionalJsonStr).filter(Boolean));
 }
 
@@ -90,7 +113,7 @@ exports.handler = async function(context, event, callback) {
               console.log(
                 invokeId, "UnlockPromise: I was the fastest, so I will attempt to notify discord users before resolving with unlock"
               );
-              notifyAllDiscord(context, config, `🔓 Doorman buzzed someone up @ Door "${config.door}"`, JSON.stringify(body.fingerprint));
+              await notifyAllDiscord(context, config, `🔓 Doorman buzzed someone up @ Door "${config.door}"`, JSON.stringify(body.fingerprint));
               resolve(twiml);
             } else {
               console.log(
@@ -113,7 +136,7 @@ exports.handler = async function(context, event, callback) {
         console.log(
           invokeId, "GracefulFallbackPromise: I was the fastest, so I will attempt to notify discord users before resolving with a call"
         );
-        notifyAllDiscord(
+        await notifyAllDiscord(
           context, 
           config, 
           `📞 Somebody buzzed the door and it dialed through to fallback phone numbers @ Door "${config.door}"`,