Name: rust-async-patterns
Author: wshobson

rust-async-patterns

wshobson/agents

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.

2.1万次安装

4.2万星标

收录于 2026.01.20

安装命令

$ npx skills add https://github.com/wshobson/agents --skill rust-async-patterns

要点

Production patterns for async Rust with Tokio, channels, error handling, and concurrent task management.

Covers seven core patterns: concurrent task execution with JoinSet and select!, multi-producer channels (mpsc, broadcast, oneshot, watch), custom error types with anyhow and thiserror, graceful shutdown via CancellationToken, async traits with async_trait, streams and async iteration, and resource pooling with RwLock and Semaphore
Includes practical examples for racing futures, limiting concurrency, timeout handling, and task cancellation across shutdown scenarios
Provides debugging guidance using tokio-console, tracing instrumentation, and common pitfalls like blocking in async contexts or holding locks across awaits
Best practices section covers when to use channels over shared state, proper error propagation, and spawn limits to prevent resource exhaustion

SKILL.md

Rust Async Patterns

Production patterns for async Rust programming with Tokio runtime, including tasks, channels, streams, and error handling.

When to Use This Skill

Building async Rust applications
Implementing concurrent network services
Using Tokio for async I/O
Handling async errors properly
Debugging async code issues
Optimizing async performance

Core Concepts

1. Async Execution Model

Future (lazy) → poll() → Ready(value) | Pending
                ↑           ↓
              Waker ← Runtime schedules

2. Key Abstractions

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

Quick Start

# 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 patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

Best Practices

Do's

Use tokio::select! - For racing futures
Prefer channels - Over shared state when possible
Use JoinSet - For managing multiple tasks
Instrument with tracing - For debugging async code
Handle cancellation - Check CancellationToken

Don'ts

Don't block - Never use std::thread::sleep in async
Don't hold locks across awaits - Causes deadlocks
Don't spawn unboundedly - Use semaphores for limits
Don't ignore errors - Propagate with ? or log
Don't forget Send bounds - For spawned futures

要点