15 Nov 2025
#rust#async#error-handling#tokio
Error Handling in Async Rust: From a Simple Function to a Real Health Monitor
The post explains how to handle errors properly in Rust async code. It shows why async errors are harder to debug, how to add useful context with anyhow, when to use structured errors with thiserror, and how to apply real patterns like timeouts, retries, JoinSet, select!, and tracing. It all comes together in a small CLI tool, leen-health, which checks multiple endpoints and outputs a clean JSON health report.