forked from zhurui/management
61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
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var pump = require('pump')
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var inherits = require('inherits')
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var Duplexify = require('duplexify')
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var toArray = function(args) {
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if (!args.length) return []
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return Array.isArray(args[0]) ? args[0] : Array.prototype.slice.call(args)
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}
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var define = function(opts) {
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var Pumpify = function() {
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var streams = toArray(arguments)
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if (!(this instanceof Pumpify)) return new Pumpify(streams)
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Duplexify.call(this, null, null, opts)
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if (streams.length) this.setPipeline(streams)
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}
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inherits(Pumpify, Duplexify)
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Pumpify.prototype.setPipeline = function() {
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var streams = toArray(arguments)
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var self = this
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var ended = false
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var w = streams[0]
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var r = streams[streams.length-1]
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r = r.readable ? r : null
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w = w.writable ? w : null
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var onclose = function() {
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streams[0].emit('error', new Error('stream was destroyed'))
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}
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this.on('close', onclose)
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this.on('prefinish', function() {
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if (!ended) self.cork()
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})
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pump(streams, function(err) {
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self.removeListener('close', onclose)
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if (err) return self.destroy(err.message === 'premature close' ? null : err)
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ended = true
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// pump ends after the last stream is not writable *but*
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// pumpify still forwards the readable part so we need to catch errors
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// still, so reenable autoDestroy in this case
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if (self._autoDestroy === false) self._autoDestroy = true
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self.uncork()
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})
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if (this.destroyed) return onclose()
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this.setWritable(w)
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this.setReadable(r)
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}
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return Pumpify
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}
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module.exports = define({autoDestroy:false, destroy:false})
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module.exports.obj = define({autoDestroy: false, destroy:false, objectMode:true, highWaterMark:16})
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module.exports.ctor = define
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