My setup involves websockets with AWS API Gateway, an EC2 instance running Node.js and Express with WS websockets. I can send a message from wscat to the API Gateway WSS URL and it shows up in the EC2 instance. However, when I send a message from the EC2 instance, it doesn't show up back in wscat. I followed this tutorial to set up the API Gateway: https://aws.amazon.com/blogs/compute/announcing-websocket-apis-in-amazon-api-gateway/
Below is the code on my EC2 instance. I'm unsure of what might be causing the issue:
const express = require("express");
const app = express();
const port = 8080;
const WebSocket = require("ws");
const url = "wss://obsf.execute-api.us-east-1.amazonaws.com/Prod";
const ws = new WebSocket(url);
process.setMaxListeners(0) // I have tried with and without this line
app.get("/", (req, res) => {
var test = { action: "sendmessage", data: "hello world" };
ws.on("open", function open() {
ws.send(JSON.stringify(test));
});
ws.on("message", function incoming(data) {
console.log(data);
});
ws.on('error', (error) => {
console.log(error)
});
res.send("Hello World!");
});
app.post("/doorbell", (req, res) => {
console.log(req);
});
app.listen(port, () => {
console.log(`Example app listening at http://localhost:${port}`);
});
Updated Error Information:
I am encountering the following errors:
...
Update: After trying the addition of EventEmitter settings, I still face the EventEmitter error.
Further Update:
Moving the `ws.on("open")` event outside the `app.get` resolves the issue. I plan to test if placing it inside the `app.post` will result in the same error. Why is it problematic to have it in `app.get`?
Another Update:
Despite trying to include it in the post request, the event emitter error persists.