nestjs-sse/README.md

Middleware for Nest.js to broadcast Server-Sent Events (SSE)

# Server-Sent Events (SSE) - Nest.js
This package implements a middleware to broadcast SSE when using Nexs.js framework.

**npm i -S nestjs-sse**

## Usage

Apply the middleware

    import {MiddlewareConsumer, Module} from "@nestjs/common";  
    import {ConnectionService} from "./connection.service";  
    import {ConnectionController} from "./connection.controller";  
    import {SSEMiddleware} from "nestjs-sse";  
      
    @Module({  
      imports: [],  
      controllers: [ConnectionController],  
      providers: [ConnectionService],  
      exports: [ConnectionService],  
    })  
    export class ConnectionModule {  
      configure(consumer: MiddlewareConsumer) {  
        consumer  
          .apply(SSEMiddleware)  
          .forRoutes(ConnectionController);  
      }  
    }

Inside the controller

    import {Controller, Get, Res} from "@nestjs/common";  
    import {Response} from "nestjs-sse";  
    import {ConnectionService} from "./connection.service";  
    import settings from "./config";  
      
    @Controller()  
    export class ConnectionController {  
      constructor(private readonly connectionService: ConnectionService) {  
      
      }  
      
      @Get("vm/connection")  
      list(@Res() res: Response) {  
        res.sse(`data: ${JSON.stringify(this.connectionService.getAliveVMsData())}\n\n`);  
      
        setInterval(() => {  
          res.sse(`data: ${JSON.stringify(this.connectionService.getAliveVMsData())}\n\n`);  
        }, settings.MAX_HEART_BEAT_IDLE_MS);  
      }  
    }