pipe streams together and close all of them if one of them closes
npm install pumppump is a small node module that pipes streams together and destroys all of them if one of them closes.
``
npm install pump
When using standard source.pipe(dest) source will _not_ be destroyed if dest emits close or an error.
You are also not able to provide a callback to tell when then pipe has finished.
pump does these two things for you
Simply pass the streams you want to pipe together to pump and add an optional callback
` js
var pump = require('pump')
var fs = require('fs')
var source = fs.createReadStream('/dev/random')
var dest = fs.createWriteStream('/dev/null')
pump(source, dest, function(err) {
console.log('pipe finished', err)
})
setTimeout(function() {
dest.destroy() // when dest is closed pump will destroy source
}, 1000)
`
You can use pump to pipe more than two streams together as well
` js
var transform = someTransformStream()
pump(source, transform, anotherTransform, dest, function(err) {
console.log('pipe finished', err)
})
`
If source, transform, anotherTransform or dest closes all of them will be destroyed.
Similarly to stream.pipe(), pump() returns the last stream passed in, so you can do:
`
return pump(s1, s2) // returns s2
Note that pump attaches error handlers to the streams to do internal error handling, so if s2 emits anproccess.on('uncaughtException')
error in the above scenario, it will not trigger a if you do not listen for it.
If you want to return a stream that combines both s1 and s2 to a single stream use
pumpify instead.
MIT
pump` is part of the mississippi stream utility collection which includes more useful stream modules similar to this one.
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