From 853ee994a68d92a44bbb9bb54e5b9e1a189b7242 Mon Sep 17 00:00:00 2001
From: Jakob Ackermann <jakob.ackermann@overleaf.com>
Date: Mon, 18 May 2020 18:25:27 +0200
Subject: [PATCH] [perf] add a few short cuts to the packet decoding

---
 services/real-time/socket.io.patch.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/services/real-time/socket.io.patch.js b/services/real-time/socket.io.patch.js
index 796f8c7574..354d8223c3 100644
--- a/services/real-time/socket.io.patch.js
+++ b/services/real-time/socket.io.patch.js
@@ -47,3 +47,13 @@ function patchedFrameHandler(opcode, str) {
   }
   return outputBuffer;
 }
+
+const parser = require('socket.io/lib/parser')
+const decodePacket = parser.decodePacket
+parser.decodePacket = function (data) {
+  if (typeof data !== 'string') return {}
+  const firstColon = data.indexOf(':')
+  if (firstColon === -1) return {}
+  if (data.indexOf(':', firstColon + 1) === -1) return {}
+  return decodePacket(data)
+}