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Amazon CPU Tamer

It reduces CPU usage on Amazon shopping pages. Enjoy your snappy shopping.

目前為 2020-12-22 提交的版本，檢視 最新版本。

  1. // ==UserScript==
  2. // @name        Amazon CPU Tamer
  3. // @name:ja     Amazon CPU Tamer
  4. // @name:zh-CN  Amazon CPU Tamer
  5. // @namespace   knoa.jp
  6. // @description It reduces CPU usage on Amazon shopping pages. Enjoy your snappy shopping.
  7. // @description:ja AmazonのショッピングページでのCPU使用率を削減します。お買いものをサクサク楽しみましょう。
  8. // @description:zh-CN 减少Amazon购物页面上的CPU利用率。顺利地享受买东西吧。
  9. // @include     https://www.amazon.com/*
  10. // @include     https://www.amazon.co.jp/*
  11. // @include     https://www.amazon.co.uk/*
  12. // @include     https://www.amazon.es/*
  13. // @include     https://www.amazon.fr/*
  14. // @include     https://www.amazon.de/*
  15. // @include     https://www.amazon.it/*
  16. // @include     https://www.amazon.*
  17. // @include     https://*.amazon-*.com/*
  18. // @include     https://*.*-amazon.com/*
  19. // @exclude     */cart/*
  20. // @exclude     */buy/*
  21. // @version     1.4.2
  22. // @grant       none
  23. // @run-at      document-start
  24. // @antifeature referral-link
  25. // @contributionURL https://paypal.me/kantankikaku
  26. // ==/UserScript==
  27.  
  28. /*
  29. [update]
  30. Added @antifeature referral-link for adopting greasyfork's rule. And minor internal update.
  31.  
  32. [memo]
  33. top:
  34.   interval インタラクション要素にも使われるので、1インスタンスにまとめた上で前面タブのみやむなく125msごとに実行。
  35.     もっとゆるい頻度にしつつ、click や  keydown 時のみ頻度を上げる手はあるが、前面タブで1-2%なら許されるだろう。
  36.     ゆるい interval による把握できている問題は詳細画像の切り替え表示だけなので、自分でやっちゃう手もあるが。
  37.   timeout  インタラクションのみで定常なしなので、そのまま実行してもよい。
  38. iframe(ad):
  39.   interval 初期化時のみなのでそのまま実行してもよい。
  40.   timeout  定常 100ms が iframe ごとに1つずつなので、1秒ごとに頻度を落とす。
  41. iframe(cloudfront.net ad)
  42.   ローカルソースのiframeから事後生成されるのでTampermonkeyが機能しない。
  43.   広告除去することはできるが、このスクリプトの役目ではない。
  44. */
  45. (function(){
  46.   const SCRIPTID = 'AmazonCpuTamer';
  47.   console.log(SCRIPTID, location.href);
  48.   const BUNDLEDINTERVAL    =     125;/* the bundled interval */
  49.   const BACKGROUNDINTERVAL = 60*1000;/* take even longer interval on hidden tab */
  50.   const IFRAMETIMEOUT      =  1*1000;/* amazon uses timeouts instead of intervals on iframes */
  51.   /*
  52.     [interval]
  53.     tame quick intervals
  54.   */
  55.   if(window === top){
  56.     /* integrate each of intervals */
  57.     const bundle = {};/* {0: {f, interval, lastExecution}} */
  58.     let index = 0;/* use it instead of interval id */
  59.     let lastExecution = 0;
  60.     /* bundle intervals */
  61.     const originalSetInterval = window.setInterval.bind(window);
  62.     window.setInterval = function(f, interval, ...args){
  63.       //console.log(SCRIPTID, 'original interval:', interval, location.href);
  64.       bundle[index] = {
  65.         f: f.bind(null, ...args),
  66.         interval: interval,
  67.         lastExecution: 0,
  68.       };
  69.       return index++;
  70.     };
  71.     window.clearInterval = function(id){
  72.       //console.log(SCRIPTID, 'clearInterval:', id, location.href);
  73.       delete bundle[id];
  74.     };
  75.     /* execute bundled intervals */
  76.     /* a bunch of intervals does cost so much even if the processes do nothing */
  77.     originalSetInterval(function(){
  78.       const now = Date.now();
  79.       if(document.hidden && now < lastExecution + BACKGROUNDINTERVAL) return;
  80.       Object.keys(bundle).forEach(id => {
  81.         const item = bundle[id];
  82.         if(item === undefined) return;/* it could be occur on tiny deletion chance */
  83.         if(now < item.lastExecution + item.interval) return;/* not yet */
  84.         item.f();
  85.         item.lastExecution = now;
  86.       });
  87.       lastExecution = now;
  88.     }, BUNDLEDINTERVAL);
  89.   }
  90.   /*
  91.     [timeout]
  92.     tame quick timeouts on iframe ads
  93.   */
  94.   if(window !== top){
  95.     const originalSetTimeout = window.setTimeout.bind(window);
  96.     window.setTimeout = function(f, timeout, ...args){
  97.       if(document.hidden) return;
  98.       if(timeout < IFRAMETIMEOUT){
  99.         //console.log(SCRIPTID, 'timeout:', timeout, 'to', IFRAMETIMEOUT, location.href);
  100.         timeout = IFRAMETIMEOUT;
  101.       }
  102.       return originalSetTimeout(f, timeout, ...args);
  103.     };
  104.   }
  105.   /*
  106.     [associate]
  107.     add an associate tag
  108.   */
  109.   if(window === top){
  110.     const IDS = {
  111.       'www.amazon.com':   'knoa-20',
  112.       'www.amazon.co.jp': 'knoa-22',
  113.       'www.amazon.co.uk': 'knoa01-21',
  114.       'www.amazon.es':    'knoa0c-21',
  115.       'www.amazon.fr':    'knoa09-21',
  116.       'www.amazon.de':    'knoa03-21',
  117.       'www.amazon.it':    'knoa0a-21',
  118.     };
  119.     if(IDS[location.host]){
  120.       addTag(IDS[location.host]);
  121.     }
  122.     function addTag(tag){
  123.       const url = new URL(location.href);
  124.       if(url.searchParams.get('tag') !== null) return;/* do not overwrite */
  125.       console.log(SCRIPTID, 'associate tag:', tag);
  126.       document.documentElement.addEventListener('mousedown', function(e){
  127.         for(let target = e.target; target; target = target.parentNode){
  128.           if(target.href && target.href.startsWith(location.origin)){
  129.             const separator = (target.href.includes('?')) ? '&' : '?';
  130.             target.href = target.href + separator + 'tag=' + tag;
  131.           }
  132.         }
  133.       });
  134.       const separator = (url.search === '') ? '?' : '&';
  135.       history.replaceState(null, document.title, location.href + separator + 'tag=' + tag);
  136.     }
  137.   }
  138. })();