What is RustyChat?
RustyChat is a realtime chat using the Rust language, Cursive as a Terminal UI, and the PubNub REST API to send and receive messages. I used a separate thread to run a subscribe loop that long polls PubNub for new messages. It will try to receive messages using a time token until the request times out or we get a message. The next request either has an updated time token if we got a response back or will redo that same request if we timed out. The main thread handles creating our UI using Cursive. It sends the channel name to the subscribe thread, and then shows the channel UI. When the user sends a message, we publish the new message to the channel we're in and also checks for more information to be sent to the UI.
What is PubNub?
PubNub is a Realtime Data Streaming Network, essentially a Pub/Sub provider. They provide over 75 SDKs in addoition to their HTTP REST API. They have a huge free trial that allows users to send up to a million messages a month for free.
Sign up for PubNub click here:
I wanted to create a Pub/Sub project in Rust and I think a multi user chat is a great demonstration of Pub/Sub. The concepts behind this project can be used towards any use case where one would want to publish and subscribe to channels. I soon want to integrate this into a Web Assembly application. ``
Sign up for PubNub to obtain API keys
Replace "INSERT_PUB_KEY_HERE" and "INSERT_SUB_KEY_HERE" with your PubNub keys
curl https://sh.rustup.rs -sSf | shinside your command line interface to install Rust using rustup
cargo runwhile inside of the folder containing cargo.toml
Your CLI should show packages being installed then the Cursive TUI should pop up asking for a username and channel name.
Open up two or more CLIs to simulate multiple users chatting in one channel!
Special thank you to Jay Oster for both explaining and contributing!