利用github給國外檔案下載加速

吃西瓜的星星發表於2021-01-15

前言

作為一名程式設計師,經常需要下載一些程式設計相關的環境,而國內的網路環境大家都知道,有的檔案用瀏覽器是下載不動的,於是我有了利用github下載檔案的想法。

我的demo專案地址:https://github.com/bobowire/wireboy.remote.download

參考資料:

  1. NodeJS使用node-fetch下載檔案並顯示下載進度示例:https://www.jianshu.com/p/4b58711cb72a
  2. nodejs——傳送郵件(帶附件):https://www.cnblogs.com/yourstars/p/6728931.html

覺得好玩的,大家可以點個贊~

下載加速原理

使用github的Action遠端執行檔案下載(下載qt環境速度可以達到3mb/s),然後將下載的檔案進行分片,每片15mb,分片後的檔案以郵件附件的方式傳送到國內郵箱,我們通過下載郵箱中的附件,將分片的附件合併成完整檔案,從而實現不翻牆、不用下載器也能下載國外檔案的目的。

簡單點說

  1. github遠端下載
  2. 檔案分片
  3. 通過郵箱發到國內
  4. 對附件進行合併

使用方法

  1. 新建github專案
  2. 建立js檔案download.js檔案,內容請查閱後文
  3. 建立workflows/RunDownload.yml檔案,內容請查閱後文
  4. 修改download.js中的fileURL 變數值,此為檔案url地址
  5. 在專案github->settings->Secrets中,點選右上方“new responsitory secret”按鈕,新增"EMAILPASS","SENDEMAIL","TOEMAIL"變數(授權碼、傳送郵箱、目標郵箱)
  6. 以上全部完成後,我們每次修改download.js檔案的fileURL地址,github都會自動進行一次下載。原理請自行百度“github action”。

注意:

  1. 授權碼(EMAILPASS)是指“郵箱第三方登入授權碼”,如何獲取授權碼,以QQ郵箱為例,請點選:http://jingyan.baidu.com/article/fedf0737af2b4035ac8977ea.html

github Action檔案(RunDownload.yml)

name: Github wireboy.remote.download
 
on:
    push:
        branches:
            - main
    schedule:
     - cron: '* * * * *'
jobs:
    build:
        runs-on: ubuntu-latest
 
        steps:
            - name: Checkout codes
              uses: actions/checkout@v2
            - name: Use Node.js
              uses: actions/setup-node@v1
              with:
                node-version: '12.x'
            - name: Run
              run: npm install
              
            - run: node download.js
              
              env:
                EMAILPASS: ${{ secrets.EMAILPASS }}
                SENDEMAIL: ${{ secrets.SENDEMAIL }}
                TOEMAIL: ${{ secrets.TOEMAIL }}

原始碼(download.js)

const fetch = require("node-fetch");
const fs = require("fs");
const path = require("path");
const progressStream = require('progress-stream');
const nodemailer = require('nodemailer');


//下載 的檔案 地址 (https://nodejs.org/dist/v12.18.3/node-v12.18.3-x64.msi)
let fileURL = 'https://nodejs.org/dist/v12.18.3/node-v12.18.3-x64.msi';


//下載儲存的檔案路徑
let fileSavePath = path.join(__dirname, path.basename(fileURL));
//快取檔案路徑
let tmpFileSavePath = fileSavePath + ".tmp";
//建立寫入流
const fileStream = fs.createWriteStream(tmpFileSavePath).on('error', function (e) {
    console.error('error==>', e)
}).on('ready', function () {
    console.log("開始下載:", fileURL);
}).on('finish', function () {
    //下載完成後重新命名檔案
    fs.renameSync(tmpFileSavePath, fileSavePath);
    console.log('檔案下載完成:', fileSavePath);
    const readstream = fs.createReadStream(fileSavePath);
	let i = 0;
	console.time('readtime');
    let patchIndex = 0;
	readstream.on('readable', () => {
        {
            console.log('start read');
            let chunk = readstream.read(1024 * 1024 * 15);
            while (null !== chunk) {
                patchIndex = patchIndex + 1;
                console.log('read times:'+patchIndex)
                console.log(fileSavePath+'.email_'+patchIndex);
                let emailFile = fs.createWriteStream(fileSavePath+'.email_'+patchIndex).on('finish',function(){
    
                })
                emailFile.write(chunk);
                emailFile.end();
                let msg = createEmailMessage(patchIndex+'_'+path.basename(fileURL),fileSavePath+'.email_'+patchIndex,path.basename(fileURL) + '(' + patchIndex + ')');
                console.log('Send Mail ' + patchIndex + ' times');
                console.log(path.basename(fileURL));
                var transporter = createTransporter();
                transporter.sendMail(msg, (error, info) => {
                    if (error) {
                        console.log('Error occurred');
                        console.log(error.message);
                        return;
                    }
                    console.log('Message sent successfully!');
                    console.log('Server responded with "%s"', info.response);
                    transporter.close();
                });
    
                chunk = readstream.read(1024 * 1024 * 10);
            }
            console.log('end read');
        }
	});
	readstream.on('close', () => {
		console.timeEnd('readtime');
    });
    
});
//請求檔案
fetch(fileURL, {
    method: 'GET',
    headers: { 'Content-Type': 'application/octet-stream' },
    // timeout: 100,    
}).then(res => {
    //獲取請求頭中的檔案大小資料
    let fsize = res.headers.get("content-length");
    //建立進度
    let str = progressStream({
        length: fsize,
        time: 100 /* ms */
    });
    // 下載進度 
    str.on('progress', function (progressData) {
        //不換行輸出
        let percentage = Math.round(progressData.percentage) + '%';
        console.log(percentage);
        // process.stdout.write('\033[2J'+);
        // console.log(progress);
        /*
        {
            percentage: 9.05,
            transferred: 949624,
            length: 10485760,
            remaining: 9536136,
            eta: 42,
            runtime: 3,
            delta: 295396,
            speed: 949624
        }
        */
    });
    res.body.pipe(str).pipe(fileStream);
}).catch(e => {
    //自定義異常處理
    console.log(e);
});



var createTransporter = function(){
    return nodemailer.createTransport({
        service: 'qq',
        auth: {
            user: process.env.SENDEMAIL,//傳送者郵箱
            pass: process.env.EMAILPASS //郵箱第三方登入授權碼
        },
       //  logger: bunyan.createLogger({
       //      name: 'nodemailer'
       //  }),//列印日誌
        debug: true
    },{
        from: process.env.SENDEMAIL,//傳送者郵箱
        headers: {
            'X-Laziness-level': 1000
        }
    });
} 

console.log('SMTP Configured');

var createEmailMessage = function(filename,filepath,subject){
    var message = {
        // Comma separated lsit of recipients 收件人用逗號間隔
        to: process.env.TOEMAIL,
    
        // Subject of the message 資訊主題
        subject:  subject,
    
        // plaintext body
        text: '請查閱附件',
    
        // Html body
        html: '<p>下載檔案成功</p>',
    
        // Apple Watch specific HTML body 蘋果手錶指定HTML格式
        watchHtml: '<b>Hello</b> to myself',
    
        // An array of attachments 附件
        attachments: [
            // String attachment
           //  {
           //      filename: 'notes.txt',
           //      content: 'Some notes about this e-mail',
           //      contentType: 'text/plain' // optional,would be detected from the filename 可選的,會檢測檔名
           //  },
           //  // Binary Buffer attchment
           //  {
           //      filename: 'image.png',
           //      content: Buffer.from('iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/' +
           //         '//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U' +
           //         'g9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC', 'base64'),
           //      cid: '00001'  // should be as unique as possible 儘可能唯一
           //  },
            // File Stream attachment
            {
                filename: filename,
                path: filepath,
                // cid: '00002'  // should be as unique as possible 儘可能唯一
             }
        ]
    
    };
    return message;
};

效果圖

收件箱

github的action執行日誌

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