83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
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var once = require('once')
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var eos = require('end-of-stream')
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var fs = require('fs') // we only need fs to get the ReadStream and WriteStream prototypes
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var noop = function () {}
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var ancient = /^v?\.0/.test(process.version)
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var isFn = function (fn) {
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return typeof fn === 'function'
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}
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var isFS = function (stream) {
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if (!ancient) return false // newer node version do not need to care about fs is a special way
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if (!fs) return false // browser
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return (stream instanceof (fs.ReadStream || noop) || stream instanceof (fs.WriteStream || noop)) && isFn(stream.close)
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}
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var isRequest = function (stream) {
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return stream.setHeader && isFn(stream.abort)
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}
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var destroyer = function (stream, reading, writing, callback) {
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callback = once(callback)
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var closed = false
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stream.on('close', function () {
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closed = true
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})
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eos(stream, {readable: reading, writable: writing}, function (err) {
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if (err) return callback(err)
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closed = true
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callback()
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})
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var destroyed = false
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return function (err) {
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if (closed) return
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if (destroyed) return
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destroyed = true
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if (isFS(stream)) return stream.close(noop) // use close for fs streams to avoid fd leaks
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if (isRequest(stream)) return stream.abort() // request.destroy just do .end - .abort is what we want
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if (isFn(stream.destroy)) return stream.destroy()
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callback(err || new Error('stream was destroyed'))
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}
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}
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var call = function (fn) {
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fn()
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}
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var pipe = function (from, to) {
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return from.pipe(to)
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}
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var pump = function () {
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var streams = Array.prototype.slice.call(arguments)
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var callback = isFn(streams[streams.length - 1] || noop) && streams.pop() || noop
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if (Array.isArray(streams[0])) streams = streams[0]
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if (streams.length < 2) throw new Error('pump requires two streams per minimum')
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var error
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var destroys = streams.map(function (stream, i) {
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var reading = i < streams.length - 1
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var writing = i > 0
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return destroyer(stream, reading, writing, function (err) {
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if (!error) error = err
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if (err) destroys.forEach(call)
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if (reading) return
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destroys.forEach(call)
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callback(error)
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})
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})
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return streams.reduce(pipe)
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}
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module.exports = pump
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