This directory contains a full stack example of a simple chat webapp using nhooyr.io/websocket.
$ cd examples/chat
$ go run . localhost:0
listening on http://127.0.0.1:51055
Visit the printed URL to submit and view broadcasted messages in a browser.
The frontend is contained in index.html
, index.js
and index.css
. It sets up the
DOM with a scrollable div at the top that is populated with new messages as they are broadcast.
At the bottom it adds a form to submit messages.
The messages are received via the WebSocket /subscribe
endpoint and published via
the HTTP POST /publish
endpoint.
The server portion is main.go
and chat.go
and implements serving the static frontend
assets, the /subscribe
WebSocket endpoint and the HTTP POST /publish
endpoint.
The code is well commented. I would recommend starting in main.go
and then chat.go
followed by
index.html
and then index.js
.
There are two automated tests for the server included in chat_test.go
. The first is a simple one
client echo test. It publishes a single message and ensures it's received.
The second is a complex concurrency test where 10 clients send 128 unique messages of max 128 bytes concurrently. The test ensures all messages are seen by every client.