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48 lines
1.2 KiB
48 lines
1.2 KiB
const through = require('through2')
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module.exports = ObjectMultiplex
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function ObjectMultiplex (opts) {
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opts = opts || {}
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// create multiplexer
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const mx = through.obj(function (chunk, enc, cb) {
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const name = chunk.name
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const data = chunk.data
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if (!name) {
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console.warn(`ObjectMultiplex - Malformed chunk without name "${chunk}"`)
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return cb()
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}
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const substream = mx.streams[name]
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if (!substream) {
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console.warn(`ObjectMultiplex - orphaned data for stream "${name}"`)
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} else {
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if (substream.push) substream.push(data)
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}
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return cb()
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})
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mx.streams = {}
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// create substreams
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mx.createStream = function (name) {
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const substream = mx.streams[name] = through.obj(function (chunk, enc, cb) {
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mx.push({
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name: name,
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data: chunk,
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})
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return cb()
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})
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mx.on('end', function () {
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return substream.emit('end')
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})
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if (opts.error) {
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mx.on('error', function () {
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return substream.emit('error')
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})
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}
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return substream
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}
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// ignore streams (dont display orphaned data warning)
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mx.ignoreStream = function (name) {
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mx.streams[name] = true
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}
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return mx
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}
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