From de0f6a2cdd6d574b2af214b7c536efbf6376f861 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Fri, 14 Jan 2022 09:07:28 -0500
Subject: [PATCH] Add longest wait time when fetching from storage in support
 info

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/1865

This may be useful to rule out that the issue is caused by the
browser API responding in unduly delayed manner.
---
 src/js/assets.js     | 7 +++++++
 src/js/background.js | 1 +
 2 files changed, 8 insertions(+)

diff --git a/src/js/assets.js b/src/js/assets.js
index 3394e8a82..fa327d52f 100644
--- a/src/js/assets.js
+++ b/src/js/assets.js
@@ -538,6 +538,7 @@ const saveAssetCacheRegistry = (( ) => {
 })();
 
 const assetCacheRead = async function(assetKey, updateReadTime = false) {
+    const t0 = Date.now();
     const internalKey = `cache/${assetKey}`;
 
     const reportBack = function(content) {
@@ -551,6 +552,12 @@ const assetCacheRead = async function(assetKey, updateReadTime = false) {
         getAssetCacheRegistry(),
         cacheStorage.get(internalKey),
     ]);
+
+    µb.supportStats.maxAssetCacheWait = Math.max(
+        Date.now() - t0,
+        parseInt(µb.supportStats.maxAssetCacheWait, 10)
+    ) + ' ms';
+
     if (
         bin instanceof Object === false ||
         bin.hasOwnProperty(internalKey) === false
diff --git a/src/js/background.js b/src/js/background.js
index 5c9d95abe..225b55ae9 100644
--- a/src/js/background.js
+++ b/src/js/background.js
@@ -215,6 +215,7 @@ const µBlock = {  // jshint ignore:line
 
     supportStats: {
         allReadyAfter: '',
+        maxAssetCacheWait: '0 ms',
     },
 
     pageStores: new Map(),