Graceful shutdown of Tokio applications in Rust
Graceful shutdown refers to being able to process all received requests without accepting new ones when shutting down a service, so as not to cause damage to ongoing operations. In the Rust programming language, achieving graceful shutdown is key to ensuring service reliability when using the Tokio asynchronous runtime library to build high-performance network services.
Tokio Introduction
Tokio is an asynchronous runtime library in Rust language that makes writing asynchronous code simple and efficient. In Tokio, tasks are the smallest unit of work and are scheduled for execution on Tokio’s executor.
Why do we need an elegant shutdown?
In network programming, it is inevitable to encounter situations where services need to be restarted or stopped. At this time, directly stopping the service may interrupt the requests being processed, leading to data loss or inconsistent state issues. Graceful shutdown can ensure that the tasks being processed can be completed, new requests are rejected, and the service is smoothly shut down.
How to achieve elegant shutdown
Implementing elegant shutdown in tokio usually involves the following steps:
- Capture the shutdown signal.
- Notify the application to stop receiving new requests.
- Wait for all ongoing tasks to be completed.
