streamqueue

StreamQueue pipe the queued streams one by one in order to preserve their content order.

Usage

Install the npm module:

npm install streamqueue --save

Then, in your scripts:

import { StreamQueue } from 'streamqueue';
import { createReadStream } from 'node:fs';

const queue = new StreamQueue(
  createReadStream('input.txt'),
  createReadStream('input2.txt'),
  createReadStream('input3.txt'),
).pipe(process.stdout);

StreamQueue also accept functions returning streams, the above can be written like this, doing system calls only when piping:

import { queueStreams } = require('streamqueue');
import { createReadStream } from 'node:fs';

const queue = queueStreams(
  createReadStream.bind(null, 'input.txt'),
  createReadStream.bind(null, 'input2.txt'),
  createReadStream.bind(null, 'input3.txt'),
).pipe(process.stdout);

Object-oriented traditionnal API offers more flexibility:

import { StreamQueue } from 'streamqueue';
import { createReadStream } from 'node:fs';

const queue = new StreamQueue();

queue.queue(
  createReadStream('input.txt'),
  createReadStream('input2.txt'),
  createReadStream('input3.txt'),
);
queue.done();

queue.pipe(process.stdout);

You can also chain StreamQueue methods like that:

import StreamQueue from 'streamqueue';
import { createReadStream } from 'node:fs';

new StreamQueue()
  .queue(createReadStream('input.txt'))
  .queue(createReadStream('input2.txt'))
  .queue(createReadStream('input3.txt'))
  .done()
  .pipe(process.stdout);

You can queue new streams at any moment until you call the done() method. So the created stream will not fire the end event until done() call.

Stats

Contributing

Feel free to propose your code if you agree with publishing it under the MIT license.

API

Classes

Functions

StreamQueue

Pipe queued streams sequentially

Kind: global class

• StreamQueue
  • new StreamQueue(options, ...streams)
  • .queue(...streams) ⇒
  • .done(...streams) ⇒

new StreamQueue(options, ...streams)

Create a new queue and pipe given streams and end if some

Returns: StreamQueue

| Param | Type | Description | | --- | --- | --- | | options | Object | The queue options | | options.objectMode | boolean | Operate in object mode | | options.pauseFlowingStream | boolean | Pause given streams that are flowing | | options.resumeFlowingStream | boolean | Resume given streams that are flowing | | ...streams | Readable | function | The stream or stream returning function to pipe in |

streamQueue.queue(...streams) ⇒

Queue each stream given in argument

Kind: instance method of StreamQueue
Returns: StreamQueue

| Param | Type | Description | | --- | --- | --- | | ...streams | Readable | function | The stream or stream returning function to pipe in |

streamQueue.done(...streams) ⇒

Queue each stream given in argument and end

Kind: instance method of StreamQueue
Returns: StreamQueue

| Param | Type | Description | | --- | --- | --- | | ...streams | Readable | function | The stream or stream returning function to pipe in |

queueObjectStreams(options, ...streams) ⇒

Create a new queue in object mode and pipe given streams and end if some

Kind: global function
Returns: StreamQueue

| Param | Type | Description | | --- | --- | --- | | options | Object | The queue options | | ...streams | Readable | function | The stream or stream returning function to pipe in |

queueStreams(options, ...streams) ⇒

Create a new queue and pipe given streams and end if some

Kind: global function
Returns: StreamQueue

| Param | Type | Description | | --- | --- | --- | | options | Object | The queue options | | ...streams | Readable | function | The stream or stream returning function to pipe in |

Authors

• Nicolas Froidure

License

MIT