What is pump?
The pump npm package is a small node module that pipes streams together and destroys all of them if one of them closes. It is particularly useful for preventing memory leaks when piping together streams and handling errors properly in Node.js applications.
What are pump's main functionalities?
Piping streams together with error handling
This code demonstrates how to use pump to pipe data from a readable stream to a writable stream, such as from a file to another file, with error handling. If an error occurs in any of the streams, pump ensures that all streams are properly closed to prevent memory leaks.
const pump = require('pump');
const fs = require('fs');
const source = fs.createReadStream('/path/to/source');
const destination = fs.createWriteStream('/path/to/dest');
pump(source, destination, function(err) {
console.log('Pipe finished', err);
});
Other packages similar to pump
through2
Through2 is a tiny wrapper around Node.js streams.Transform (Streams2/3) to avoid explicit subclassing noise. It's similar to pump in facilitating stream operations, but it focuses more on transforming stream data rather than piping and managing stream lifecycle.
mississippi
Mississippi is a collection of useful stream utilities for Node.js, including pump. It offers a variety of tools for working with streams beyond what pump provides, such as stream concatenation, parallel stream processing, and more, making it a more comprehensive toolkit for stream operations.
pump
pump is a small node module that pipes streams together and destroys all of them if one of them closes.
npm install pump
What problem does it solve?
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
Usage
Simply pass the streams you want to pipe together to pump and add an optional callback
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()
}, 1000)
You can use pump to pipe more than two streams together as well
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
If you want to return a stream that combines both s1 and s2 to a single stream use
pumpify instead.
License
MIT
Related
pump
is part of the mississippi stream utility collection which includes more useful stream modules similar to this one.