Cannot get the WebSockets example working
Hello,
I'm running the LFW111 course examples on node 20.11.0 with
"dependencies": { "@fastify/autoload": "^5.0.0", "@fastify/cors": "^9.0.1", "@fastify/sensible": "^5.0.0", "@fastify/websocket": "^10.0.1", "fastify": "^4.26.1", "fastify-cli": "^6.2.1", "fastify-plugin": "^4.0.0" },
The Web Sockets example in lesson 04 (Going Realtime) doesn't work for me. When I run the mock-service, and select a category in the static web page, the mock service of the routes/orders plugin throws an error complaining that the socket is undefined:
[16:45:38.506] ERROR (369197): Cannot read properties of undefined (reading 'send') reqId: "req-2" err: { "type": "TypeError", "message": "Cannot read properties of undefined (reading 'send')", "stack": TypeError: Cannot read properties of undefined (reading 'send') at Object.<anonymous> (file:///home/cfinis/workspace/jsnad/my-project-WS/mock-srv/routes/orders/index.mjs:9:16) at /home/cfinis/workspace/jsnad/my-project-WS/mock-srv/node_modules/@fastify/websocket/index.js:185:34 ... }
Any idea what is going wrong?
Thanks
Answers
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I've got the same problem. Did you ever get it working?
0 -
Hi,
here is what worked for me based on the official documentationasync ({ socket }, request) => {
use this instead:
async ( socket, request) => {
the parameter "socket" is just a variable, not an object (with {socket} )
Let's also create an index.mjs file in our newly created folder with the following contents: "use strict"; export default async function (fastify, opts) { fastify.get( "/:category", { websocket: true }, async (socket, request) => { socket.send(JSON.stringify({ id: "A1", total: 3 })); } )};
6 -
@jonatasmello , thank you! That was the problem.
0 -
Saved my sanity with this, thanks!
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Thanks @jonatasmello. Could the admins fix this? Also, there is a minor bug on the related page https://trainingportal.linuxfoundation.org/learn/course/introduction-to-nodejs-lfw111x/going-real-time/real-time-functionality?page=4 -> the static files should be served with command npx serve -p 5050 static
0 -
@jonatasmello Thanks it worked.
0 -
@jonatasmello said:
Hi,
here is what worked for me based on the official documentationasync ({ socket }, request) => {
use this instead:
async ( socket, request) => {
the parameter "socket" is just a variable, not an object (with {socket} )
Let's also create an index.mjs file in our newly created folder with the following contents: "use strict"; export default async function (fastify, opts) { fastify.get( "/:category", { websocket: true }, async (socket, request) => { socket.send(JSON.stringify({ id: "A1", total: 3 })); } )};
This is the miracle working code!! A crack!!
0 -
Grazie!
0
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