RxWS

RxWS is a RESTful reactive JavaScript implementation on top of web sockets. This includes, GET, POST, PUT, REMOVE (DELETE), PATCH, and HEAD. RxWS guarantees message delivery by generating a correlation id for each message (to and from the server). Both the server and client automatically send an acknowledgement response for each request. If there is no acknowledgement after a timeout, an error is thrown.

RxWS implements a RESTful protocol. You can use any websocket server as long as it implements the same protocol. By default RxWS supports SocketIO with rxws-socketio

Setup

RxWS requires a websocket abstraction layer. By default it supports both SockJS and SocketIO.

import rxws from 'rxws';
import SocketIOBackend from 'rxws-socketio/SocketIOBackend';

rxws.setBackend({
	backend: SocketIOBackend,
	url: 'ws://someurl'
});

rxws.get('users')
  .subscribe(data => console.log)
  .catch(error => console.error)

Example

Performing a GET request:

// Request all users
rxws.get('users')
  .subscribe(data => console.log, error => console.error)
  
// Request a specific user
rxws.get('users', {
  parameters: { 'users': 13 }
})
  .subscribe(data => console.log, error => console.error)
  
// Optionally the request could have been built with
rxws({
  method: 'get',
  resource: 'users',
  parameters: { 'users': 13 }
})
  .subscribe(data => console.log, error => console.error)

Performing a POST request:

// Create a user
rxws.post('users', {
  firstName: 'Johnny',
  lastName: 'Appleseed'
})
  .subscribe(data => console.log, error => console.error)

// Optionally the request could have been built with
rxws({
  method: 'post',
  resource: 'users',
  body: {
    firstName: 'Johnny',
    lastName: 'Appleseed'
  }
})
  .subscribe(data => console.log, error => console.error)

Nested resources:

// Request a comment from a specific post
rxws.get('posts.comments', {
  parameters: { 'posts': 13, 'comments': 15 }
})
  .subscribe(data => console.log, error => console.error)

Custom headers:

// Request all comments from a post
rxws.get('posts.comments', {
  parameters: { 'posts': 13 },
  apiVersion: '1.2.1',
  accessToken: '7fgnasdfvy0afdsjfjdls',
  queryParameters: { include: 'history' }
})  
  .subscribe(data => console.log, error => console.error)

Server Notifications:

// Listen for new posts
rxws.onNotification('newPost')
  .forEach((messageBody) => {
    rxws.get('posts', { parameters: { posts: messageBody.id } })
      .subscribe(data => console.log, error => console.error);
  })

Request Middleware:

// Middleware progress from one another in the order they are defined
rxws.requestUse()
	.subscribe(({req, send, reply, next}) => {
		req.header.resource = 'prefix.' + req.header.resource;
		next();
	}, ({req, err}) => {
		//the error function is currently never called
	});

Response Middleware:

// Middleware progress from one another in the order they are defined
rxws.use()
	.subscribe(({req, res, reply, retry, next}) => {
		res.requestTime = Date.now();
		next();
	});

rxws.use()
	.subscribe(({req, res, reply, retry, next}) => {
		next();
	}, ({req, err}) => {
		// Do something with the error and the request.
	});

rxws.use()
	.subscribe(({req, res, reply, retry, next}) => {
		reply(res);
	});

// Use middleware to retry requests

rxws.use()
	.subscribe(({res, reply, retry, next}) => {
		if (res.header.statusCode === 401) {
			auth.refreshAuthToken()
				.then(() => retry())
		} else {
			reply(res);
		}
	})

Reactive example:

// Try three times to get the data and then return cached data if still fails
var source = rxws.get('url').retry(3).catch(cachedVersion());

var subscription = source.subscribe(
  (data) => {
    // Displays the data from the URL or cached data
    console.log(data);
  }
);

API

rxws.setBackend(options)

rxws.setBackend({
	backend: rxwsBackendImplementation,
	url: string,
	url: (): Observable,
	defaultHeaders?: object,
	requestTransformer?: (request: object, send: Function): null,
	responseTransformer?: (response: object, reply: Function, retry: Function): null,
	timeout?: 10000,
	onConnectionError?: (error: string): null
})

rxws(config): observable

rxws({
  method: 'get',
  resource: 'posts',
  parameters: { 'posts': 13 }
});

rxws.get(resource[, config]): observable

rxws.delete(resource[, config]): observable

rxws.head(resource[, config]): observable

rxws.post(resource[, data[, config]]): observable

rxws.put(resource[, data[, config]]): observable

rxws.patch(resource[, data[, config]]): observable

rxws.onMessage(type: string): observable

config obbject:

{
	resource: string,
	method: string,
	parameters: object,
	data: object,
	extraResources: object,
	queryParameters: object
}

###License ISC License (ISC) Copyright (c) 2016, CanopyTax

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.