130 lines
2.6 KiB
Markdown
130 lines
2.6 KiB
Markdown
duplexer2 [](https://travis-ci.org/deoxxa/fork)
|
|
=========
|
|
|
|
Like duplexer (http://npm.im/duplexer) but using streams2.
|
|
|
|
Overview
|
|
--------
|
|
|
|
duplexer2 is a reimplementation of [duplexer](http://npm.im/duplexer) using the
|
|
readable-stream API which is standard in node as of v0.10. Everything largely
|
|
works the same.
|
|
|
|
Installation
|
|
------------
|
|
|
|
Available via [npm](http://npmjs.org/):
|
|
|
|
> $ npm install duplexer2
|
|
|
|
Or via git:
|
|
|
|
> $ git clone git://github.com/deoxxa/duplexer2.git node_modules/duplexer2
|
|
|
|
API
|
|
---
|
|
|
|
**duplexer2**
|
|
|
|
Creates a new `DuplexWrapper` object, which is the actual class that implements
|
|
most of the fun stuff. All that fun stuff is hidden. DON'T LOOK.
|
|
|
|
```javascript
|
|
duplexer2([options], writable, readable)
|
|
```
|
|
|
|
```javascript
|
|
var duplex = duplexer2(new stream.Writable(), new stream.Readable());
|
|
```
|
|
|
|
Arguments
|
|
|
|
* __options__ - an object specifying the regular `stream.Duplex` options, as
|
|
well as the properties described below.
|
|
* __writable__ - a writable stream
|
|
* __readable__ - a readable stream
|
|
|
|
Options
|
|
|
|
* __bubbleErrors__ - a boolean value that specifies whether to bubble errors
|
|
from the underlying readable/writable streams. Default is `true`.
|
|
|
|
Example
|
|
-------
|
|
|
|
Also see [example.js](https://github.com/deoxxa/duplexer2/blob/master/example.js).
|
|
|
|
Code:
|
|
|
|
```javascript
|
|
var stream = require("stream");
|
|
|
|
var duplexer2 = require("duplexer2");
|
|
|
|
var writable = new stream.Writable({objectMode: true}),
|
|
readable = new stream.Readable({objectMode: true});
|
|
|
|
writable._write = function _write(input, encoding, done) {
|
|
if (readable.push(input)) {
|
|
return done();
|
|
} else {
|
|
readable.once("drain", done);
|
|
}
|
|
};
|
|
|
|
readable._read = function _read(n) {
|
|
// no-op
|
|
};
|
|
|
|
// simulate the readable thing closing after a bit
|
|
writable.once("finish", function() {
|
|
setTimeout(function() {
|
|
readable.push(null);
|
|
}, 500);
|
|
});
|
|
|
|
var duplex = duplexer2(writable, readable);
|
|
|
|
duplex.on("data", function(e) {
|
|
console.log("got data", JSON.stringify(e));
|
|
});
|
|
|
|
duplex.on("finish", function() {
|
|
console.log("got finish event");
|
|
});
|
|
|
|
duplex.on("end", function() {
|
|
console.log("got end event");
|
|
});
|
|
|
|
duplex.write("oh, hi there", function() {
|
|
console.log("finished writing");
|
|
});
|
|
|
|
duplex.end(function() {
|
|
console.log("finished ending");
|
|
});
|
|
```
|
|
|
|
Output:
|
|
|
|
```
|
|
got data "oh, hi there"
|
|
finished writing
|
|
got finish event
|
|
finished ending
|
|
got end event
|
|
```
|
|
|
|
License
|
|
-------
|
|
|
|
3-clause BSD. A copy is included with the source.
|
|
|
|
Contact
|
|
-------
|
|
|
|
* GitHub ([deoxxa](http://github.com/deoxxa))
|
|
* Twitter ([@deoxxa](http://twitter.com/deoxxa))
|
|
* Email ([deoxxa@fknsrs.biz](mailto:deoxxa@fknsrs.biz))
|