Current Dev State

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Tim Lorsbach
2025-06-23 20:13:54 +02:00
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The MIT License (MIT)
Copyright (c) 2014 Artem Medeusheyev
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# ordered-read-streams [![NPM version](https://badge.fury.io/js/ordered-read-streams.png)](http://badge.fury.io/js/ordered-read-streams) [![Build Status](https://travis-ci.org/armed/ordered-read-streams.png?branch=master)](https://travis-ci.org/armed/ordered-read-streams)
Combines array of streams into one read stream in strict order.
## Installation
`npm install ordered-read-streams`
## Overview
`ordered-read-streams` handles all data/errors from input streams in parallel, but emits data/errors in strict order in which streams are passed to constructor. This is `objectMode = true` stream.
## Example
```js
var through = require('through2');
var Ordered = require('ordered-read-streams');
var s1 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 200)
});
var s2 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 30)
});
var s3 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 100)
});
var streams = new Ordered([s1, s2, s3]);
streams.on('data', function (data) {
console.log(data);
})
s1.write('stream 1');
s1.end();
s2.write('stream 2');
s2.end();
s3.write('stream 3');
s3.end();
```
Ouput will be:
```
stream 1
stream 2
stream 3
```
## Licence
MIT

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var Readable = require('stream').Readable;
var util = require('util');
function addStream(streams, stream)
{
if(!stream.readable) throw new Error('All input streams must be readable');
if(this._readableState.ended) throw new Error('Adding streams after ended');
var self = this;
stream._buffer = [];
stream.on('data', function(chunk)
{
if(this === streams[0])
self.push(chunk);
else
this._buffer.push(chunk);
});
stream.on('end', function()
{
for(var stream = streams[0];
stream && stream._readableState.ended;
stream = streams[0])
{
while(stream._buffer.length)
self.push(stream._buffer.shift());
streams.shift();
}
if(!streams.length) self.push(null);
});
stream.on('error', this.emit.bind(this, 'error'));
streams.push(stream);
}
function OrderedStreams(streams, options) {
if (!(this instanceof(OrderedStreams))) {
return new OrderedStreams(streams, options);
}
streams = streams || [];
options = options || {};
options.objectMode = true;
Readable.call(this, options);
if(!Array.isArray(streams)) streams = [streams];
if(!streams.length) return this.push(null); // no streams, close
var addStream_bind = addStream.bind(this, []);
this.concat = function()
{
Array.prototype.forEach.call(arguments, function(item)
{
if(Array.isArray(item))
item.forEach(addStream_bind);
else
addStream_bind(item);
});
};
this.concat(streams);
}
util.inherits(OrderedStreams, Readable);
OrderedStreams.prototype._read = function () {};
module.exports = OrderedStreams;

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{
"_from": "ordered-read-streams@^0.1.0",
"_id": "ordered-read-streams@0.1.0",
"_inBundle": false,
"_integrity": "sha1-/VZamvjrRHO6abbtijQ1LLVS8SY=",
"_location": "/ordered-read-streams",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "ordered-read-streams@^0.1.0",
"name": "ordered-read-streams",
"escapedName": "ordered-read-streams",
"rawSpec": "^0.1.0",
"saveSpec": null,
"fetchSpec": "^0.1.0"
},
"_requiredBy": [
"/glob-stream"
],
"_resolved": "https://registry.npmjs.org/ordered-read-streams/-/ordered-read-streams-0.1.0.tgz",
"_shasum": "fd565a9af8eb4473ba69b6ed8a34352cb552f126",
"_spec": "ordered-read-streams@^0.1.0",
"_where": "/home/manfred/enviPath/ketcher2/ketcher/node_modules/glob-stream",
"author": {
"name": "Artem Medeusheyev",
"email": "artem.medeusheyev@gmail.com"
},
"bugs": {
"url": "https://github.com/armed/ordered-read-streams/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "Combines array of streams into one read stream in strict order",
"devDependencies": {
"jshint": "~2.4.1",
"mocha": "~1.17.0",
"pre-commit": "0.0.4",
"should": "~3.0.1",
"through2": "~0.4.0"
},
"homepage": "https://github.com/armed/ordered-read-streams#readme",
"license": "MIT",
"main": "index.js",
"name": "ordered-read-streams",
"repository": {
"type": "git",
"url": "git://github.com/armed/ordered-read-streams.git"
},
"scripts": {
"test": "jshint *.js test/*.js && mocha -R spec"
},
"version": "0.1.0"
}

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var should = require('should');
var through = require('through2');
var OrderedStreams = require('../');
describe('ordered-read-streams', function () {
it('should end if no streams are given', function (done) {
var streams = OrderedStreams();
streams.on('data', function () {
done('error');
});
streams.on('end', done);
});
it('should throw error if one or more streams are not readable', function (done) {
var writable = { readable: false };
try {
new OrderedStreams(writable);
} catch (e) {
e.message.should.equal('All input streams must be readable');
done();
}
});
it('should emit data from all streams', function(done) {
var s1 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var s2 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var s3 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var streams = new OrderedStreams([s1, s2, s3]);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
results[0].should.equal('stream 1');
results[1].should.equal('stream 2');
results[2].should.equal('stream 3');
done();
});
s1.write('stream 1');
s1.end();
s2.write('stream 2');
s2.end();
s3.write('stream 3');
s3.end();
});
it('should emit all data event from each stream', function (done) {
var s = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var streams = new OrderedStreams(s);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
done();
});
s.write('data1');
s.write('data2');
s.write('data3');
s.end();
});
it('should preserve streams order', function(done) {
var s1 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 200);
});
var s2 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 30);
});
var s3 = through.obj(function (data, enc, next) {
var self = this;
setTimeout(function () {
self.push(data);
next();
}, 100);
});
var streams = new OrderedStreams([s1, s2, s3]);
var results = [];
streams.on('data', function (data) {
results.push(data);
});
streams.on('end', function () {
results.length.should.be.exactly(3);
results[0].should.equal('stream 1');
results[1].should.equal('stream 2');
results[2].should.equal('stream 3');
done();
});
s1.write('stream 1');
s1.end();
s2.write('stream 2');
s2.end();
s3.write('stream 3');
s3.end();
});
it('should emit stream errors downstream', function (done) {
var s = through.obj(function (data, enc, next) {
this.emit('error', new Error('stahp!'));
next();
});
var s2 = through.obj(function (data, enc, next) {
this.push(data);
next();
});
var errMsg;
var streamData;
var streams = new OrderedStreams([s, s2]);
streams.on('data', function (data) {
streamData = data;
});
streams.on('error', function (err) {
errMsg = err.message;
});
streams.on('end', function () {
errMsg.should.equal('stahp!');
streamData.should.equal('Im ok!');
done();
});
s.write('go');
s.end();
s2.write('Im ok!');
s2.end();
});
});