Downloadr

Binary file download library built on top of got.

Installation

npm install downloadr

Features

• Progression tracking
• File integrity check
• Abort
• Queue

Usage

Initialization

const Downloadr = require('downloadr');
 
const downloadr = new Downloadr();

Queue a download

downloadr.add({
    url:  'http://localhost/file.zip',
    hash: '4fb8652b2be29734df530fc0cfcaae922564b840', // optional SHA-1 - omit to skip file integrity check
    file: 'file.zip'
});

You can also pass an array of downloads directly to the constructor:

const downloadr = new Downloadr([
    {
        url:  'http://localhost/file.zip',
        hash: '4fb8652b2be29734df530fc0cfcaae922564b840',
        file: 'file.zip'
    }
]);

Event listeners

// Progress
downloadr.on('progress', (job, progress) => {
    /*
        job => {
            url:  'http://localhost/file.zip',
            hash: '4fb8652b2be29734df530fc0cfcaae922564b840',
            file: 'file.zip'
        }
 
        progress => {
            current: 0.1254,
            total: 0.896,
            speed: 949624
        }
    */
});
 
// Job end
downloadr.on('jobEnd', (job, err) => {
    if (err) {
        return console.log(`An error occurred: ${err.message}`);
    }
 
    console.log(`Successfully downloaded ${job.url}`);
});
 
// End
downloadr.on('end', err => {
    if (err) {
        return console.log(`An error occurred: ${err.message}`);
    }
 
    console.log('Download queue complete');
});

Post processing

Use postProcess argument to pass a function that will be executed after a successful download, but before jobEnd event is triggered:

downloadr.add({
    url:         'http://localhost/file.zip',
    file:        'file.zip',
    postProcess: job => {
        console.dir(job);
    }
});

If postProcess returns a promise, jobEnd will only be triggered once it's fulfilled (and pass an error if it's rejected).

downloadr.add({
    url:         'http://localhost/file.zip',
    file:        'file.zip',
    postProcess: job => new Promise((resolve, reject) => {
        console.log(`File ${job.file} downloaded, waiting 2 seconds...`);
        setTimeout(resolve, 2000);
    })
});

Start/abort download queue

// Start queue
downloadr.start();
 
// Abort queue
downloadr.abort();

Tests

To run the test suite, first install the dependencies, then run npm test:

npm install
npm test

Resources

• Changelog

TODO

• Seen an issue with 0b files