Some utilities for the development of socket.io applications with Inversify.

You can install inversify-socket-utils using npm:

npm install inversify inversify-socket-utils reflect-metadata --save

Please refer to the InversifyJS documentation to learn more about the installation process.

Step 1: Create a controller.

import "reflect-metadata";

import { injectable } from "inversify";
import { Socket } from "socket.io";

import {
  connectedSocket,
  controller,
  onConnect,
  onDisconnect,
  onMessage,
} from "inversify-socket-utils";

@injectable()
@controller("/namespace")
export class MessageController {
  @onConnect("connection")
  connection() {
    console.log("client connected");
  }

  @onDisconnect("disconnect")
  disconnect() {
    console.log("client disconnected");
  }

  @onMessage("message")
  message(@connectedSocket() socket: Socket) {
    console.log("message received");
    socket.emit("message", "hello!");
  }
}

Step 2: Configure container and server.

Configure the inversify container in your composition root as usual.

Then, pass the container to the InversifySocketServer constructor. This will allow it to register all controllers and their dependencies from your container and attach them to the socket.io app. Then just call server.build() to prepare your app.

In order for the InversifySocketServer to find your controllers, you must bind them to the TYPE.Controller service identifier and tag the binding with the controller's name.

import { createServer } from "http";
import { Container } from "inversify";
import { Server } from "socket.io";

import { MessageController } from "./controllers/message";
import {
  interfaces,
  InversifySocketServer,
  TYPE,
} from "inversify-socket-utils";

const container = new Container();

container.bind<interfaces.Controller>(TYPE.Controller).to(MessageController);

const app = createServer();

const io = new Server(app, {
  cors: {
    origin: "*",
  },
});

const server = new InversifySocketServer(container, io);
server.build();

app.listen(3000);

console.log("Server is listening on port 3000");

The MIT License (MIT)

Copyright (c) 2024 Alexander Shelepenok

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.