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var request = require('request')
var fs = require('fs')
var path = require('path')
var log = require('single-line-log').stdout
var progress = require('progress-stream')
var prettyBytes = require('pretty-bytes')
var throttle = require('throttleit')
var EventEmitter = require('events').EventEmitter
var debug = require('debug')('nugget')
function noop () {}
module.exports = function (urls, opts, cb) {
if (!Array.isArray(urls)) urls = [urls]
if (urls.length === 1) opts.singleTarget = true
var defaultProps = {}
if (opts.sockets) {
var sockets = +opts.sockets
defaultProps.pool = {maxSockets: sockets}
}
if (opts.proxy) {
defaultProps.proxy = opts.proxy
}
if (opts.strictSSL !== null) {
defaultProps.strictSSL = opts.strictSSL
}
if (Object.keys(defaultProps).length > 0) {
request = request.defaults(defaultProps)
}
var downloads = []
var errors = []
var pending = 0
var truncated = urls.length * 2 >= (process.stdout.rows - 15)
urls.forEach(function (url) {
debug('start dl', url)
pending++
var dl = startDownload(url, opts, function done (err) {
debug('done dl', url, pending)
if (err) {
debug('error dl', url, err)
errors.push(err)
dl.error = err.message
}
if (truncated) {
var i = downloads.indexOf(dl)
downloads.splice(i, 1)
downloads.push(dl)
}
if (--pending === 0) {
render()
cb(errors.length ? errors : undefined)
}
})
downloads.push(dl)
dl.on('start', function (progressStream) {
throttledRender()
})
dl.on('progress', function (data) {
debug('progress', url, data.percentage)
dl.speed = data.speed
if (dl.percentage === 100) render()
else throttledRender()
})
})
var _log = opts.quiet ? noop : log
render()
var throttledRender = throttle(render, opts.frequency || 250)
if (opts.singleTarget) return downloads[0]
else return downloads
function render () {
var height = process.stdout.rows
var rendered = 0
var output = ''
var totalSpeed = 0
downloads.forEach(function (dl) {
if (2 * rendered >= height - 15) return
rendered++
if (dl.error) {
output += 'Downloading ' + path.basename(dl.target) + '\n'
output += 'Error: ' + dl.error + '\n'
return
}
var pct = dl.percentage
var speed = dl.speed
var total = dl.fileSize
totalSpeed += speed
var bar = Array(Math.floor(45 * pct / 100)).join('=') + '>'
while (bar.length < 45) bar += ' '
output += 'Downloading ' + path.basename(dl.target) + '\n' +
'[' + bar + '] ' + pct.toFixed(1) + '%'
if (total) output += ' of ' + prettyBytes(total)
output += ' (' + prettyBytes(speed) + '/s)\n'
})
if (rendered < downloads.length) output += '\n... and ' + (downloads.length - rendered) + ' more\n'
if (downloads.length > 1) output += '\nCombined Speed: ' + prettyBytes(totalSpeed) + '/s\n'
_log(output)
}
function startDownload (url, opts, cb) {
var targetName = path.basename(url).split('?')[0]
if (opts.singleTarget && opts.target) targetName = opts.target
var target = path.resolve(opts.dir || process.cwd(), targetName)
if (opts.resume) {
resume(url, opts, cb)
} else {
download(url, opts, cb)
}
var progressEmitter = new EventEmitter()
progressEmitter.target = target
progressEmitter.speed = 0
progressEmitter.percentage = 0
return progressEmitter
function resume (url, opts, cb) {
fs.stat(target, function (err, stats) {
if (err && err.code === 'ENOENT') {
return download(url, opts, cb)
}
if (err) {
return cb(err)
}
var offset = stats.size
var req = request.get(url)
req.on('error', cb)
req.on('response', function (resp) {
resp.destroy()
var length = parseInt(resp.headers['content-length'], 10)
// file is already downloaded.
if (length === offset) return cb()
if (!isNaN(length) && length > offset && /bytes/.test(resp.headers['accept-ranges'])) {
opts.range = [offset, length]
}
download(url, opts, cb)
})
})
}
function download (url, opts, cb) {
var headers = opts.headers || {}
if (opts.range) {
headers.Range = 'bytes=' + opts.range[0] + '-' + opts.range[1]
}
var read = request(url, { headers: headers })
read.on('error', cb)
read.on('response', function (resp) {
debug('response', url, resp.statusCode)
if (resp.statusCode > 299 && !opts.force) return cb(new Error('GET ' + url + ' returned ' + resp.statusCode))
var write = fs.createWriteStream(target, {flags: opts.resume ? 'a' : 'w'})
write.on('error', cb)
write.on('finish', cb)
var fullLen
var contentLen = Number(resp.headers['content-length'])
var range = resp.headers['content-range']
if (range) {
fullLen = Number(range.split('/')[1])
} else {
fullLen = contentLen
}
progressEmitter.fileSize = fullLen
if (range) {
var downloaded = fullLen - contentLen
}
var progressStream = progress({ length: fullLen, transferred: downloaded }, onprogress)
progressEmitter.emit('start', progressStream)
resp
.pipe(progressStream)
.pipe(write)
})
function onprogress (p) {
var pct = p.percentage
progressEmitter.progress = p
progressEmitter.percentage = pct
progressEmitter.emit('progress', p)
}
}
}
}
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