Use socket.io in controllers

Question

I only need socket.io to emit messages to clients, if a new object is inserted to database. So my idea was to emit the message directly fr

Answer 1

You can solve this problem declaring io instance as global variable.

at the last line of my app.js: IoInstance = require("./socket.io")(server);

at the './socket.io' :
const chatNamespace = require("./namespaces/chat");
const notificationsNamespace = require("./namespaces/notifications");
const auth = require("./middlewares/auth");

module.exports = (server) => {
  const io = require("socket.io").listen(server);

  io.of("/chats")
    .use(auth)
    .on("connect", (socket) => chatNamespace({ io, socket }));

  io.of("/notifications")
    .use(auth)
    .on("connect", (socket) => notificationsNamespace({ io, socket }));

  return io;
};

then, you can use the IoInstance wherever you want, event into your controller. Btw, I could have use it into my namespaces as well, but I've just realized it right now.

example of implementation in the testController.js:

module.exports = async (req, res) => {
  IoInstance.of("/notifications")
    .to("myUserId")
    .emit("sendNotification", ["test", "test1"]);
  return res.send("oioi");
};