@qrvey/websocket-client

The @qrvey/websocket-client package provides a unified interface to work with websocket as any client. Works from Backend and Frontend. This package is based on the WebSocket services that use Socket.io

Installation

npm install @qrvey/websocket-client

Or with yarn:

yarn add @qrvey/websocket-client

Environment variables

DOMAIN; // The BASE Qrvey domain. If not set, could be pass in the constructor of WebSocketClient class

API Documentation

Class: WebSocketClient

Constructor

new WebSocketClient(auth, options)

Creates an instance of WebSocketClient.

• Parameters:
  • auth (Object): Authentication details.
    • userId (string, optional): User identifier.
    • clientId (string, optional): Client identifier.
    • token (string, optional): Authentication token.
    • apiKey (string, optional): API key.
  • options (Object): Additional options.
    • domain (string, optional): Domain to stablish connection with the socket. If not set, try to find the domain in process.env.DOMAIN
    • isAutoPingPongEnable (boolean, optional, default=true): Enables or disables the auto ping-pong mechanism.

Methods

publish({ eventName, data, isPublic = false }: { eventName: string; data: Record<string, any>; isPublic?: boolean; }): void

Publishes an event with the specified data.

• Parameters:
  • eventName (string): The name of the event to publish.
  • data (any): The data to send with the event.
  • isPublic (boolean, optional, default=false): Whether the event is public or not.

subscribe(eventName: string, callback: (message: any) => void): void

Subscribes to an event and provides a callback to handle the messages.

• Parameters:

  • eventName (string): The name of the event to subscribe to.
  • callback (function): A callback function to handle the messages. The function receives one argument:
    • message (any): The message received from the event.

• Returns: this (the instance of WebSocketClient)

onError(callback: (message: any) => void): void

Sets a callback function to handle error messages.

• Parameters:
  • callback (function): A callback function to handle error messages. The function receives one argument:
    • message (any): The error message.

status(): SOCKET_STATUS

Returns the current status of the WebSocket connection.

• Returns: SOCKET_STATUS (enum): The current status of the WebSocket connection.

connect(): void

Establishes the WebSocket connection if needed. After create the instances, the connection and reconnection is done by default.

disconnect(): void

Disconnects the WebSocket client.

Enum: SOCKET_STATUS

The SOCKET_STATUS enum defines the possible states of a WebSocket connection.

Enum Values:

• CONNECTED: Indicates that the WebSocket connection has been successfully established.
• ACTIVE: Indicates that the WebSocket connection is active and currently transmitting or receiving data.
• RECOVERED: Indicates that the WebSocket connection was lost but has been successfully re-established.
• DISCONNECTED: Indicates that the WebSocket connection has been intentionally or unintentionally closed.
• UNDEFINED: Indicates that the WebSocket connection status is undefined or has not yet been determined.

Usage Example

const { WebSocketClient, SOCKET_STATUS }  = require('@qrvey/websocket-client');

const socket = new WebSocketClient({ userId: '', token: '' });

socket.publish({
    eventName: 'from:example',
    data: { body: 'example message' }
})

socket.subscribe('example', (message) => {
    console.log('Recibed: ', message);
})

if (socket.status() === SOCKET_STATUS.DISCONNECTED) console.log('Socket disconnected!')