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Forward one (emitter|stream)
's events to another -> connect parts of your application whose interface you have no control over.
This is compatible both with the node-core EventEmitter and with component/emitter.
$ component install juliangruber/fwd
$ npm install fwd
var fwd = require('fwd');
var Stream = require('stream');
var EventEmitter = require('events').EventEmitter;
// or: var EventEmitter = require('emitter')
var src = new EventEmitter();
var dest = new EventEmitter();
fwd(src, dest);
dest.on('event', function() {
// success
});
src.emit('event');
var src = new Stream();
src.readable = true;
var dest = new EventEmitter();
fwd(src, dest, {'data': 'entry'});
var src = new EventEmitter();
var dest = new Stream();
dest.writable = true;
fwd(src, dest, 'entry');
fwd(src, dest, {'wrong': JSON.stringify});
var src = new Stream();
src.readable = true;
var dest = new Stream();
dest.writable = true;
fwd(src, dest, function(data) {
return data*2;
});
You can rewrite data on-the-fly:
var src = new EventEmitter();
var dest = new EventEmitter();
fwd(src, dest, '*'); // the same as with no 3rd argument
fwd(src, dest, ['event1', 'event2']) // only forward event1 and event2
fwd(src, dest, [{'event1': 'entry'}, '*']) // forward event1 as entry and everything else
fwd(src, dest, [{'event1': function(data) { // forward event1 with it's data doubled
return data*2;
}}]);
fwd(src, dest, [{'event1': function(event, data) { // also rewrite the event name
return {
event: 'event-foo',
data : data*2
}
}}]);
fwd(src, dest, function(event, data) { // forward and rewrite everything
return { // the same as: {'*': function(){ ... }}
event: 'my-'+event,
data : JSON.stringify(data)
}
});
Forward all events from src
to dest
.
Forward only event
.
Forward only events
.
Rewrite names and fwd only that. mapping
can be in an array to do multiple rewrites at one.
Apply fn
to
(data)
and return modified data
(event, data)
and return {event:'event', data:'data'}
fn
can also appear inside mappings.
stop
is returned by every fwd
-call, so you can stop forwarding. Use this as stream-unpipe which isn't in the stream class yet.
$ git clone https://github.com/juliangruber/fwd.git && cd fwd
$ npm install
$ mocha
Copyright (c) 2012 Julian Gruber <julian@juliangruber.com>
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.
FAQs
Forward one (emitter|stream)'s events to another
The npm package fwd receives a total of 6,008 weekly downloads. As such, fwd popularity was classified as popular.
We found that fwd demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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