The Ultimate Guide to ngrx Websocket

Websockets have become a popular tool for real-time communication between a server and a client. They allow the server to push data to the client without the need for the client to constantly request new data. ngrx is a popular open-source library for managing state in Angular applications. ngrx websocket is an extension to ngrx that provides a simple way to integrate websockets into an Angular application. In this article, we will discuss everything you need to know about ngrx websocket.

What is ngrx Websocket?

ngrx websocket is an extension to ngrx that provides a simple way to integrate websockets into an Angular application. It is designed to work seamlessly with ngrx and allows you to easily manage state through websockets. With ngrx websocket, you can easily create a bi-directional communication channel between your server and client, allowing for real-time updates.

How Does ngrx Websocket Work?

ngrx websocket works by creating a websocket connection between your server and client. Once the connection is established, you can use it to send and receive data in real-time. The ngrx websocket library provides a set of actions and reducers that allow you to manage the state of your application through the websocket connection. For example, you can use actions to send data to the server and reducers to update the state of your application based on data received from the server.

Why Use ngrx Websocket?

ngrx websocket provides a number of benefits over traditional HTTP requests. Firstly, it allows for real-time communication between your server and client. This means that updates can be pushed to the client as soon as they are available, rather than waiting for the client to request new data. Secondly, it reduces the amount of data that needs to be sent between the server and client. With HTTP requests, the client needs to send a request and wait for a response, even if there is no new data available. With websockets, data can be sent as soon as it is available, reducing the amount of unnecessary requests.

Getting Started with ngrx Websocket

1. Installation

The first step to using ngrx websocket is to install it. You can do this using npm:

npm install –save @ngrx/websocket

2. Creating a WebSocket Service

The next step is to create a WebSocket service. This service will be responsible for establishing the websocket connection and handling incoming and outgoing messages. Here is an example of a simple WebSocket service:

  1. import { Injectable } from ‘@angular/core’;
  2. import { Subject } from ‘rxjs’;
  3. import { WebSocketSubject } from ‘@ngrx/websocket’;
  4. @Injectable()
  5. export class MyWebSocketService {
  6. private socket$: WebSocketSubject<any>;
  7. public messages$: Subject<any> = new Subject();
  8. constructor() {
  9. this.socket$ = new WebSocketSubject(‘wss://my-websocket-server.com’);
  10. this.socket$.subscribe((message) => {
  11. this.messages$.next(message);
  12. });
  13. }
  14. public send(message: any): void {
  15. this.socket$.next(message);
  16. }
  17. }

This service creates a WebSocketSubject using the URL of your websocket server. It also creates a Subject that can be used to receive incoming messages. The send method can be used to send messages to the server.

3. Creating Actions and Reducers

The next step is to create actions and reducers that will be used to manage the state of your application through the websocket connection. Here is an example of a simple action and reducer:

  1. import { createAction, props } from ‘@ngrx/store’;
  2. import { Message } from ‘./message.model’;
  3. export const sendMessage = createAction(‘[My Component] Send Message’, props<{ message: Message }>());
  1. import { createReducer, on } from ‘@ngrx/store’;
  2. import { sendMessage } from ‘./message.actions’;
  3. export interface MessageState {
  4. messages: Message[];
  5. }
  6. export const initialState: MessageState = {
  7. messages: []
  8. }
  9. export const messageReducer = createReducer(initialState,
  10. on(sendMessage, (state, { message }) => ({
  11. …state,
  12. messages: […state.messages, message],
  13. }))
  14. );

The sendMessage action is used to send a message to the server. The messageReducer updates the state of the application by adding new messages to the messages array.

4. Integrating with ngrx

The final step is to integrate the WebSocket service, actions, and reducers with ngrx. Here is an example of how to do this:

  1. import { NgModule } from ‘@angular/core’;
  2. import { CommonModule } from ‘@angular/common’;
  3. import { StoreModule } from ‘@ngrx/store’;
  4. import { EffectsModule } from ‘@ngrx/effects’;
  5. import { WebSocketEffects } from ‘./websocket.effects’;
  6. import { messageReducer } from ‘./message.reducer’;
  7. import { MyWebSocketService } from ‘./my-websocket.service’;
  8. @NgModule({
  9. declarations: [],
  10. imports: [
  11. CommonModule,
  12. StoreModule.forFeature(‘messages’, messageReducer),
  13. EffectsModule.forFeature([WebSocketEffects])
  14. ],
  15. providers: [MyWebSocketService]
  16. )
  17. export class MessageModule { }

This code imports the necessary modules, reducers, and effects, and provides the WebSocket service as a provider. It also registers the messageReducer with ngrx using the StoreModule.forFeature method.

FAQ

What is the difference between ngrx and ngrx websocket?

ngrx is a library for managing state in Angular applications. ngrx websocket is an extension to ngrx that provides a simple way to integrate websockets into an Angular application.

What are the benefits of using ngrx websocket?

ngrx websocket provides a number of benefits over traditional HTTP requests, including real-time communication between the server and client, reduced data transfer, and improved performance.

How do I install ngrx websocket?

You can install ngrx websocket using npm:

npm install –save @ngrx/websocket

Can I use ngrx websocket with other frameworks?

No, ngrx websocket is designed specifically for use with Angular.