rockets-client

Rockets JS Client

A small client for Rockets using JSON RPC as communication contract over a WebSocket.

Table of Contents

• Installation
• Usage
  • Connection
  • Notifications
  • Requests
  • Batching
• Release
• Learning Material

Installation

---

You can install this package from NPM:

npm add rxjs rockets-client

Or with Yarn:

yarn add rxjs rockets-client

CDN

For CDN, you can use unpkg:

https://unpkg.com/rockets-client/dist/bundles/rockets-client.umd.min.js

The global namespace for rockets is rocketsClient:

const {Client} = rocketsClient;

const rockets = new Client({
    url: 'myhost'
});

Usage

---

Connection

Create a client and connect:

import {Client} from 'rockets-client';

const rockets = new Client({
    url: 'myhost',
    onConnected() {
        console.info('I just connected');
    },
    onClosed(evt) {
        console.log(`Socket connection closed with code ${evt.code}`);
    }
});

Close the connection with the socket cleanly:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

rockets.subscribe({
    next(notification) {
        console.log(notification);
    },
    complete() {
        console.log('Socket connection closed');
    }
});

rockets.disconnect();

Notifications

Listen to server notifications:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

rockets.subscribe(notification => {
    console.log(notification);
});

Send notifications:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

rockets.notify('mymethod', {
    ping: true
});

Send a notification using the Notification object:

import {Client, Notification} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const notification = new Notification('mymethod', {
    ping: true
});
rockets.notify(notification);

Requests

Make a request:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const response = await rockets.request('mymethod', {
    ping: true
});
console.log(response);

NOTE: There is no need to wait for a connection to be established with the socket as requests will be buffered and sent once the connection is alive. In case of a socket error, the request promise will reject. The same is true for batch requests and notifications.

Or make a request using the Request object:

import {Client, Request} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const request = new Request('mymethod', {
    ping: true
});
const response = await rockets.request(request);
console.log(response);

Handle a request error:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

try {
    await rockets.request('mymethod');
} catch (err) {
    console.log(err.code);
    console.log(err.message);
    console.log(err.data);
}

NOTE: Any error that may occur will be a JsonRpcError.

Cancel a request:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const task = rockets.request('mymethod');
task.cancel();

Get progress updates for a request:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const task = rockets.request('mymethod');
task.on('progress')
    .subscribe(progress => {
        console.log(progress);
    });

Batching

Make a batch request:

import {Client, Notification, Request} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const request = new Request('mymethod');
const notification = new Notification('mymethod');
const [response] = await rockets.batch(...[
    request,
    notification
]);

const result = await response.json();
console.log(result);

NOTE: Notifications will not return any responses and if no requests are sent, the batch request will resolve without any arguments.

Handle a batch request error:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

try {
    const request = new Request('mymethod');
    await rockets.batch(request);
} catch (err) {
    console.log(err.code);
    console.log(err.message);
    console.log(err.data);
}

NOTE: The batch promise will not reject for response errors, but you can catch the response error when using the response .json() method:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

try {
    const request = new Request('mymethod');
    const [response] = await rockets.batch(request);
    await response.json();
} catch (err) {
    console.log(err.code);
    console.log(err.message);
    console.log(err.data);
}

Cancel a batch request:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const request = new Request('mymethod');
const task = rockets.batch(request);

task.cancel();

NOTE: Notifications cannot be canceled.

Get progress updates for a batch request:

import {Client} from 'rockets-client';

const rockets = new Client({url: 'myhost'});

const request = new Request('mymethod');
const task = rockets.batch(request);

task.on('progress')
    .subscribe(progress => {
        console.log(progress);
    });

Release

---

If you're a contributor and wish to make a release of this package use:

# Cut a minor release
# A release can be: patch, minor, major;
yarn release --release-as minor

See release as a target type imperatively like npm-version for more release options.

After the changes land in master, the new version will be automatically published by the CI.

IMPORTANT: Follow the semver for versioning.

Learning Material

---

• JSON RPC 2.0
• RxJs