tokio-networking

# Tokio Networking Patterns

This skill provides network programming patterns for building production-grade services with the Tokio ecosystem.

## HTTP Service with Hyper and Axum

Build HTTP services with routing and middleware:

```rust
use axum::{
    Router,
    routing::{get, post},
    extract::{State, Path, Json},
    response::IntoResponse,
    middleware,
};
use std::sync::Arc;

#[derive(Clone)]
struct AppState {
    db: Arc<Database>,
    cache: Arc<Cache>,
}

async fn create_app() -> Router {
    let state = AppState {
        db: Arc::new(Database::new().await),
        cache: Arc::new(Cache::new()),
    };

    Router::new()
        .route("/health", get(health_check))
        .route("/api/v1/users", get(list_users).post(create_user))
        .route("/api/v1/users/:id", get(get_user).delete(delete_user))
        .layer(middleware::from_fn(logging_middleware))
        .layer(middleware::from_fn(auth_middleware))
        .with_state(state)
}

async fn health_check() -> impl IntoResponse {
    "OK"
}

async fn get_user(
    State(state): State<AppState>,
    Path(id): Path<u64>,
) -> Result<Json<User>, StatusCode> {
    state.db.get_user(id)
        .await
        .map(Json)
        .ok_or(StatusCode::NOT_FOUND)
}

async fn logging_middleware<B>(
    req: Request<B>,
    next: Next<B>,
) -> impl IntoResponse {
    let method = req.method().clone();
    let uri = req.uri().clone();

    let start = Instant::now();
    let response = next.run(req).await;
    let duration = start.elapsed();

    tracing::info!(
        method = %method,
        uri = %uri,
        status = %response.status(),
        duration_ms = duration.as_millis(),
        "request completed"
    );

    response
}
```

## gRPC Service with Tonic

Build type-safe gRPC services:

```rust
use tonic::{transport::Server, Request, Response, Status};

pub mod proto {
    tonic::include_proto!("myservice");
}

use proto::my_service_server::{MyService, MyServiceServer};

#[derive(Default)]
pub st