Master Rust async programming with Tokio, async traits, error handling, and concurrent patterns. Use when building async Rust applications, implementing concurrent systems, or debugging async code.
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Production patterns for async Rust programming with Tokio runtime, including tasks, channels, streams, and error handling.
Future (lazy) → poll() → Ready(value) | Pending
↑ ↓
Waker ← Runtime schedules
| Concept | Purpose |
|---|---|
Future | Lazy computation that may complete later |
async fn | Function returning impl Future |
await |
| Suspend until future completes |
Task | Spawned future running concurrently |
Runtime | Executor that polls futures |
# Cargo.toml
[dependencies]
tokio = { version = "1", features = ["full"] }
futures = "0.3"
async-trait = "0.1"
anyhow = "1.0"
tracing = "0.1"
tracing-subscriber = "0.3"
use tokio::time::{sleep, Duration};
use anyhow::Result;
#[tokio::main]
async fn main() -> Result<()> {
// Initialize tracing
tracing_subscriber::fmt::init();
// Async operations
let result = fetch_data("https://api.example.com").await?;
println!("Got: {}", result);
Ok(())
}
async fn fetch_data(url: &str) -> Result<String> {
// Simulated async operation
sleep(Duration::from_millis(100)).await;
Ok(format!("Data from {}", url))
}
Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
tokio::select! - For racing futuresJoinSet - For managing multiple tasksCancellationTokenstd::thread::sleep in async? or log
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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).