email_newsletter_api/docs/tokio.md

tokio Notes

The tokio Async Runtime

tokio will be the engine in charge of driving Futures to completion

• #[tokio::main] macro is just a builder to help building the runtime. It is basically saying, we want this async function to be run.
• tokio::spawn(/*async task*/) will spawn an async task to be run. We can continue executing other code concurrently while task runs in the background. If we need to wait for task to complete before proceeding, we can use task.await (which #[tokio::test] will take care for us in the mean time).