Chore: also fetch EasyList & EasyPrivacy from fallback server

Build/build-reject-domainset.js

@@ -85,7 +85,13 @@ const threads = isCI ? cpuCount : cpuCount / 2;
 
   (await Promise.all([
     // Easy List
-    'https://easylist.to/easylist/easylist.txt',
+    [
+      'https://easylist.to/easylist/easylist.txt',
+      [
+        'https://easylist-downloads.adblockplus.org/easylist.txt',
+        'https://secure.fanboy.co.nz/easylist.txt'
+      ]
+    ],
     // AdGuard DNS Filter
     'https://adguardteam.github.io/AdGuardSDNSFilter/Filters/filter.txt',
     // uBlock Origin Filter List
@@ -112,7 +118,13 @@ const threads = isCI ? cpuCount : cpuCount / 2;
     // AdGuard Chinese filter (EasyList China + AdGuard Chinese filter)
     'https://filters.adtidy.org/extension/ublock/filters/224.txt',
     // Easy Privacy
-    'https://easylist.to/easylist/easyprivacy.txt',
+    [
+      'https://easylist.to/easylist/easyprivacy.txt',
+      [
+        'https://secure.fanboy.co.nz/easyprivacy.txt',
+        'https://easylist-downloads.adblockplus.org/easyprivacy.txt'
+      ]
+    ],
     // Curben's Malware Online UrlHaus
     'https://malware-filter.gitlab.io/malware-filter/urlhaus-filter-agh-online.txt',
     // Curben's Phishing Online Filter
@@ -123,7 +135,14 @@ const threads = isCI ? cpuCount : cpuCount / 2;
     'https://raw.githubusercontent.com/DandelionSprout/adfilt/master/GameConsoleAdblockList.txt',
     // PiHoleBlocklist
     'https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/SmartTV-AGH.txt',
-  ].map(processFilterRules))).forEach(({ white, black }) => {
+  ].map(input => {
+    if (typeof input === 'string') {
+      return processFilterRules(input);
+    }
+    if (Array.isArray(input) && input.length === 2) {
+      return processFilterRules(input[0], input[1]);
+    }
+  }))).forEach(({ white, black }) => {
     white.forEach(i => filterRuleWhitelistDomainSets.add(i));
     black.forEach(i => domainSets.add(i));
   });

Build/lib/parse-filter.js

@@ -92,9 +92,12 @@ async function processHosts (hostsUrl, includeAllSubDomain = false) {
 
 /**
  * @param {string | URL} filterRulesUrl
+ * @param {(string | URL)[] | undefined} fallbackUrls
  * @returns {Promise<{ white: Set<string>, black: Set<string> }>}
  */
-async function processFilterRules (filterRulesUrl) {
+async function processFilterRules (filterRulesUrl, fallbackUrls) {
+  console.time(`processFilterRules: ${filterRulesUrl}`);
+
   if (typeof filterRulesUrl === 'string') {
     filterRulesUrl = new URL(filterRulesUrl);
   }
@@ -105,7 +108,13 @@ async function processFilterRules (filterRulesUrl) {
   const blacklistDomainSets = new Set();
 
   /** @type string[] */
-  const filterRules = (await (await fetchWithRetry(filterRulesUrl)).text()).split('\n').map(line => line.trim());
+  const filterRules = (
+    await Promise.any(
+      [filterRulesUrl, ...(fallbackUrls || [])].map(
+        async url => (await fetchWithRetry(url)).text()
+      )
+    )
+  ).split('\n').map(line => line.trim());
 
   filterRules.forEach(line => {
     const lineStartsWithDoubleVerticalBar = line.startsWith('||');
@@ -197,6 +206,8 @@ async function processFilterRules (filterRulesUrl) {
     }
   });
 
+  console.timeEnd(`processFilterRules: ${filterRulesUrl}`);
+
   return {
     white: whitelistDomainSets,
     black: blacklistDomainSets