wscat VS websocat

Let's quickly test the backend, to make sure it works as we expect. We'll use the wscat command-line utility. The command below will open a long-lived connection to the API Gateway, and we'll be able to send and receive messages in a subshell:

It's similar to running netcat in server mode, wrapping a script. It's even closer to doing that using websocat [1], whereby one does not have to do the websocket header juggling.

The main difference is that while netcat or websocat will spawn a new process for each connecting client, ScaleSocket has a concept of rooms (channels). For a room, a process is spawned once only. All clients connecting to the same room are routed to the same process. This is not straight forward to do using the forementioned tools.

There's a small comparison page [2] where I have mentioned some alternative tools.

[1] https://github.com/vi/websocat

one combination I came to really love this year is babashka (https://github.com/babashka/babashka) + websocat (https://github.com/vi/websocat). I wrote about a method of live web programming with this pair at https://github.com/whacked/cow/blob/main/a%20technique%20for...

babashka isn't strictly necessary; you can also pipe plain text, but pushing hiccup expressions to the browser DOM from the REPL with instant feedback has opened a new world of interactive programming for me.

No... the core of it is a django instance in the cloud with a Vue front end (what you're seeing in the screen shot). To push data in, the client connects to a websocket (using https://github.com/vi/websocat) and push key/value pairs in. I'm not in the middle of gameplay at all.

There's really nothing to this. I just have to provide the bus name and an optional pattern. Now using websocat, I get output like this:

Subscriptions is real-time streaming of data from server to client through WebSocket. You will need a constantly active connection to stream such events. You cannot use curl for this and have to use a WebSocket client like websocat if you want to access it via command line. Once executed, a stream of pending transaction IDs will start flowing in.