将 NestJS 连接到 websocket 服务器 [英] Connect NestJS to a websocket server

问题描述

NestJS 如何作为 websocket 客户端使用?我想使用 NestJS 作为客户端连接到远程 websocket 服务器，但我在框架中没有找到有关此实现的任何信息.

How can NestJS be use as a websocket client? I want to connect to a remote websocket server as a client using NestJS, but I didn't find any information about this implementation in the framework.

推荐答案

由于 Nestjs 只是 Nodejs 的一个框架，所以需要找到支持 Websocket 的 NPM 包.例如，我使用 ws 和 @types/ws 类型定义，并创建一个 Websocket 客户端作为 Nestjs 服务类:

As Nestjs is simply a framework for Nodejs, so you need to find an NPM package that supports Websocket. For example, I use ws with @types/ws type definition, and create a Websocket client as a Nestjs service class:

// socket-client.ts
import { Injectable } from "@nestjs/common";
import * as WebSocket from "ws";

@Injectable()
export class WSService {
    // wss://echo.websocket.org is a test websocket server
    private ws = new WebSocket("wss://echo.websocket.org");

    constructor() {
        this.ws.on("open", () => {
            this.ws.send(Math.random())
        });

        this.ws.on("message", function(message) {
            console.log(message);
        });
    }

    send(data: any) {
        this.ws.send(data);
    }

    onMessage(handler: Function) {
        // ...
    }

    // ...
}

// app.module.ts
import { Module } from "@nestjs/common";
import { WSService } from "./socket-client";

@Module({
    providers: [WSService]
})
export class AppModule {}

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