From d07563013b0705589868c930003d62bb659336aa Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Fri, 26 Feb 2021 14:47:27 +0000
Subject: [PATCH] Log when turn creds expire

---
 src/client.js                  | 13 +++++++++++++
 src/webrtc/callEventHandler.ts |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/src/client.js b/src/client.js
index 5e224a5bf..16c79895d 100644
--- a/src/client.js
+++ b/src/client.js
@@ -393,6 +393,9 @@ export function MatrixClient(opts) {
     this._clientWellKnown = undefined;
     this._clientWellKnownPromise = undefined;
 
+    this._turnServers = [];
+    this._turnServersExpiry = null;
+
     // The SDK doesn't really provide a clean way for events to recalculate the push
     // actions for themselves, so we have to kinda help them out when they are encrypted.
     // We do this so that push rules are correctly executed on events in their decrypted
@@ -4942,6 +4945,15 @@ MatrixClient.prototype.getTurnServers = function() {
     return this._turnServers || [];
 };
 
+/**
+ * Get the unix timestamp (in seconds) at which the current
+ * TURN credentials (from getTurnServers) expire
+ * @return {number} The expiry timestamp, in seconds, or null if no credentials
+ */
+MatrixClient.prototype.getTurnServersExpiry = function() {
+    return this._turnServersExpiry;
+};
+
 /**
  * Set whether to allow a fallback ICE server should be used for negotiating a
  * WebRTC connection if the homeserver doesn't provide any servers. Defaults to
@@ -5437,6 +5449,7 @@ function checkTurnServers(client) {
                 credential: res.password,
             };
             client._turnServers = [servers];
+            client._turnServersExpiry = Date.now() + res.ttl;
             // re-fetch when we're about to reach the TTL
             client._checkTurnServersTimeoutID = setTimeout(() => {
                 checkTurnServers(client);
diff --git a/src/webrtc/callEventHandler.ts b/src/webrtc/callEventHandler.ts
index ba4452ea8..304eacfdd 100644
--- a/src/webrtc/callEventHandler.ts
+++ b/src/webrtc/callEventHandler.ts
@@ -138,6 +138,8 @@ export class CallEventHandler {
                 );
             }
 
+            const timeUntilTurnCresExpire = this.client.getTurnServersExpiry() - Date.now();
+            logger.info("Current turn creds expire in " + timeUntilTurnCresExpire + " seconds");
             call = createNewMatrixCall(this.client, event.getRoomId(), {
                 forceTURN: this.client._forceTURN,
             });