Request-Response ortiented communication for websockets with Primus.
npm install @cocalc/primus-responderClient and server plugin that adds a request/response cycle to Primus.
 
$ npm install primus-responder --save
* Wrap existing REST API into a realtime websocket connection
* Simplify program flow if waiting on a specific response is needed
## Usage
``javascript
var Primus = require('primus')
, PrimusResponder = require('primus-responder')
, server = require('http').createServer()
, options = { transformer: 'websockets' }
, primus = new Primus(server, options);
primus.use('responder', PrimusResponder);
primus.on('connection', function(spark) {
// Handle incoming requests:
spark.on('request', function(data, done) {
// Echo the received request data
done(data);
});
// Request a response from the spark:
spark.writeAndWait('request from server', function(response) {
// Write the sparks response to console
console.log('Reponse from spark:', response);
});
});
server.listen(8080);
`
`javascript
var primus = Primus.connect('ws://localhost:8080');
// Handle incoming requests:
primus.on('request', function(data, done) {
// Echo the received request data
done(data);
});
// Request a response from the server:
primus.writeAndWait('request from client', function(response) {
// Write the servers response to console
console.log('Response from server:', response);
});
`
*
contains the data which was sent with the request
* done is a callback function. First and only argument contains the data you want to transmit.`javascript
spark.on('request', function(data, done) {
done('this is the response');
});
`#### spark#writeAndWait(data, fn)
Sends
to the given spark. As soon as the response from the spark arrives, fn is called with the sparks response as first and only argument.`javascript
spark.writeAndWait('request data', function(response) {
console.log('spark responded:', response);
});
`$3
#### primus#on('request', fn)
Registers an event handler for incoming requests. The handler has two arguments: *
contains the data which was sent with the request
* done is a callback function. First and only argument contains the data you want to transmit.`javascript
primus.on('request', function(data, done) {
done('this is the response');
});
`#### primus#writeAndWait(data, fn)
Sends
to the connected server. As soon as the response arrives, fn is called with the servers response as first and only argument.`javascript
primus.writeAndWait('request data', function(response) {
console.log('server responded:', response);
});
``$ npm test
* http://alabor.me/articles/request-response-oriented-websockets/
Copyright (c) 2013 Manuel Alabor
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.
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