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sonic-boom

NPM Package Version Build Status js-standard-style

Extremely fast utf8-only stream implementation to write to files and file descriptors.

This implementation is partial, but support backpressure and .pipe() in is here. However, it is 2-3x faster than Node Core fs.createWriteStream():

benchSonic*1000: 1916.904ms
benchSonicSync*1000: 8605.265ms
benchSonic4k*1000: 1965.231ms
benchSonicSync4k*1000: 1588.224ms
benchCore*1000: 5851.959ms
benchConsole*1000: 7605.713ms

Note that sync mode without buffering is slower than a Node Core WritableStream, however this mode matches the expected behavior of console.log().

Note that if this is used to log to a windows terminal (cmd.exe or powershell), it is needed to run chcp 65001 in the terminal to correctly display utf-8 characters, see chcp for more details.

Install

npm i sonic-boom

Example

'use strict'

const SonicBoom = require('sonic-boom')
const sonic = new SonicBoom({ fd: process.stdout.fd }) // or { dest: '/path/to/destination' }

for (let i = 0; i < 10; i++) {
  sonic.write('hello sonic\n')
}

API

SonicBoom(opts)

Creates a new instance of SonicBoom.

The options are:

For sync:false a SonicBoom instance will emit the 'ready' event when a file descriptor is available. For sync:true this is not relevant because the 'ready' event will be fired when the SonicBoom instance is created, before it can be subscribed to.

SonicBoom#write(string)

Writes the string to the file. It will return false to signal the producer to slow down.

SonicBoom#flush([cb])

Writes the current buffer to the file if a write was not in progress. Do nothing if minLength is zero or if it is already writing.

call the callback when the flush operation is completed. when failed the callback is called with an error.

SonicBoom#reopen([file])

Reopen the file in place, useful for log rotation.

Example:

const stream = new SonicBoom('./my.log')
process.on('SIGUSR2', function () {
  stream.reopen()
})

SonicBoom#flushSync()

Flushes the buffered data synchronously. This is a costly operation.

SonicBoom#end()

Closes the stream, the data will be flushed down asynchronously

SonicBoom#destroy()

Closes the stream immediately, the data is not flushed.

Events

SonicBoom#close

See Stream#close. The 'close' event when the instance has been closed.

SonicBoom#drain

See Stream#drain. The 'drain' event is emitted when source can resume sending data.

SonicBoom#drop <any>

When destination file maximal length is reached, the 'drop' event is emitted with data that could not be written.

SonicBoom#error <Error>

The 'error' event is emitted when the destination file can not be opened, or written.

SonicBoom#finish

See Stream#finish. The 'finish' event after calling end() method and when all data was written.

SonicBoom#ready

The 'ready' event occurs when the created instance is ready to process input.

SonicBoom#write <number>

The 'write' event occurs every time data is written to the underlying file. It emits the number of written bytes.

License

MIT