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Rust 1.92+ development specialist covering Axum, Tokio, SQLx, and memory-safe systems programming. Use when building high-performance, memory-safe applications or WebAssembly.
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| name | moai-lang-rust |
| description | Rust 1.92+ development specialist covering Axum, Tokio, SQLx, and memory-safe systems programming. Use when building high-performance, memory-safe applications or WebAssembly. |
| version | 1.1.0 |
| category | language |
| modularized | false |
| user-invocable | false |
| updated | "2026-01-08T00:00:00.000Z" |
| status | active |
| allowed-tools | ["Read","Grep","Glob","mcp__context7__resolve-library-id","mcp__context7__get-library-docs"] |
Rust 1.92+ Development Specialist with deep patterns for high-performance, memory-safe applications.
Auto-Triggers: .rs, Cargo.toml, async/await, Tokio, Axum, SQLx, serde, lifetimes, traits
Core Use Cases:
Quick Patterns:
Axum REST API:
let app = Router::new()
.route("/api/users/:id", get(get_user))
.with_state(app_state);
let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
axum::serve(listener, app).await?;
Async Handler with SQLx:
async fn get_user(
State(state): State<AppState>,
Path(id): Path<i64>,
) -> Result<Json<User>, AppError> {
let user = sqlx::query_as!(User, "SELECT * FROM users WHERE id = $1", id)
.fetch_optional(&state.db).await?
.ok_or(AppError::NotFound)?;
Ok(Json(user))
}
Modern Rust Features:
Async Traits (Stable):
trait AsyncRepository {
async fn get(&self, id: i64) -> Result<User, Error>;
async fn create(&self, user: CreateUser) -> Result<User, Error>;
}
impl AsyncRepository for PostgresRepository {
async fn get(&self, id: i64) -> Result<User, Error> {
sqlx::query_as!(User, "SELECT * FROM users WHERE id = $1", id)
.fetch_one(&self.pool).await
}
}
Let-Else Pattern:
fn get_user(id: Option<i64>) -> Result<User, Error> {
let Some(id) = id else { return Err(Error::MissingId); };
let Ok(user) = repository.find(id) else { return Err(Error::NotFound); };
Ok(user)
}
Installation:
[dependencies]
axum = "0.8"
tokio = { version = "1.48", features = ["full"] }
tower-http = { version = "0.6", features = ["cors", "trace"] }
Complete API Setup:
use axum::{extract::{Path, State, Query}, routing::{get, post}, Router, Json};
use tower_http::cors::CorsLayer;
#[derive(Clone)]
struct AppState { db: PgPool }
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let pool = PgPoolOptions::new()
.max_connections(25)
.connect(&std::env::var("DATABASE_URL")?).await?;
let app = Router::new()
.route("/api/v1/users", get(list_users).post(create_user))
.route("/api/v1/users/:id", get(get_user))
.layer(CorsLayer::permissive())
.with_state(AppState { db: pool });
let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
axum::serve(listener, app).await?;
Ok(())
}
Handler Patterns:
async fn list_users(
State(state): State<AppState>,
Query(params): Query<ListParams>,
) -> Result<Json<Vec<User>>, AppError> {
let users = sqlx::query_as!(User,
"SELECT * FROM users ORDER BY created_at DESC LIMIT $1 OFFSET $2",
params.limit.unwrap_or(10), params.offset.unwrap_or(0))
.fetch_all(&state.db).await?;
Ok(Json(users))
}
Task Spawning and Channels:
use tokio::sync::mpsc;
async fn worker_pool() {
let (tx, mut rx) = mpsc::channel::<Job>(100);
for _ in 0..4 {
tokio::spawn(async move {
while let Some(job) = rx.recv().await { process_job(job).await; }
});
}
}
async fn timeout_operation() -> Result<Data, Error> {
tokio::select! {
result = fetch_data() => result,
_ = tokio::time::sleep(Duration::from_secs(5)) => Err(Error::Timeout),
}
}
Type-Safe Queries:
#[derive(Debug, sqlx::FromRow)]
struct User { id: i64, name: String, email: String }
async fn user_operations(pool: &PgPool) -> Result<(), sqlx::Error> {
let user = sqlx::query_as!(User,
"SELECT id, name, email FROM users WHERE id = $1", 1i64)
.fetch_one(pool).await?;
let mut tx = pool.begin().await?;
sqlx::query!("INSERT INTO users (name, email) VALUES ($1, $2)", "John", "john@example.com")
.execute(&mut *tx).await?;
tx.commit().await?;
Ok(())
}
use serde::{Deserialize, Serialize};
#[derive(Debug, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
struct User {
id: i64,
#[serde(rename = "userName")]
name: String,
#[serde(skip_serializing_if = "Option::is_none")]
profile_url: Option<String>,
#[serde(default)]
is_active: bool,
}
thiserror:
use thiserror::Error;
#[derive(Error, Debug)]
pub enum AppError {
#[error("database error: {0}")]
Database(#[from] sqlx::Error),
#[error("not found: {0}")]
NotFound(String),
#[error("unauthorized")]
Unauthorized,
}
impl IntoResponse for AppError {
fn into_response(self) -> Response {
let (status, message) = match &self {
AppError::NotFound(_) => (StatusCode::NOT_FOUND, self.to_string()),
AppError::Unauthorized => (StatusCode::UNAUTHORIZED, self.to_string()),
AppError::Database(_) => (StatusCode::INTERNAL_SERVER_ERROR, "Internal error".into()),
};
(status, Json(json!({"error": message}))).into_response()
}
}
use clap::{Parser, Subcommand};
#[derive(Parser)]
#[command(name = "myapp", version, about)]
struct Cli {
#[arg(short, long, global = true)]
config: Option<PathBuf>,
#[command(subcommand)]
command: Commands,
}
#[derive(Subcommand)]
enum Commands {
Serve { #[arg(short, long, default_value = "3000")] port: u16 },
Migrate,
}
fn main() {
let cli = Cli::parse();
match cli.command {
Commands::Serve { port } => serve(port),
Commands::Migrate => migrate(),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn test_create_user() {
let pool = setup_test_db().await;
let result = create_user(&pool, "John", "john@example.com").await;
assert!(result.is_ok());
assert_eq!(result.unwrap().name, "John");
}
}
Release Build:
[profile.release]
lto = true
codegen-units = 1
panic = "abort"
strip = true
Minimal Container (5-15MB):
FROM rust:1.92-alpine AS builder
WORKDIR /app
COPY Cargo.toml Cargo.lock ./
RUN mkdir src && echo "fn main(){}" > src/main.rs && cargo build --release
COPY src ./src
RUN touch src/main.rs && cargo build --release
FROM alpine:latest
COPY --from=builder /app/target/release/app /app
EXPOSE 3000
CMD ["/app"]
Rate-Limited Operations:
use tokio::sync::Semaphore;
async fn rate_limited(items: Vec<String>, max: usize) -> Vec<String> {
let sem = std::sync::Arc::new(Semaphore::new(max));
let handles: Vec<_> = items.into_iter().map(|item| {
let sem = sem.clone();
tokio::spawn(async move {
let _permit = sem.acquire().await.unwrap();
process_item(item).await
})
}).collect();
futures::future::join_all(handles).await.into_iter().filter_map(|r| r.ok()).collect()
}
Library Documentation Access:
/rust-lang/rust - Rust language and stdlib/tokio-rs/tokio - Tokio async runtime/tokio-rs/axum - Axum web framework/launchbadge/sqlx - SQLx async SQL/serde-rs/serde - Serialization framework/dtolnay/thiserror - Error derive/clap-rs/clap - CLI parsermoai-lang-go - Go systems programming patternsmoai-domain-backend - REST API architecture and microservices patternsmoai-foundation-quality - Security hardening for Rust applicationsmoai-workflow-testing - Test-driven development workflowsCommon Issues:
cargo clean && cargo buildrustc --version && cargo --versioncargo update && cargo treecargo sqlx preparePerformance Characteristics:
See reference.md for complete language reference and Context7 library mappings.
See examples.md for production-ready code examples.
Last Updated: 2025-12-30 Version: 1.1.0