axum-tariff

“Some countries... they need to wait.” — You, probably

🚦 Middleware for Axum that introduces configurable request delays based on the client's country (IP geolocation).

Inspired by the chaotic beauty of international trade wars, this crate uses the MaxMind GeoIP2 database to detect IPs by country and apply a delay ("tariff") per your configuration.

✨ Features

• ⏱️ Delay requests from specific countries
• 🌍 Uses MaxMind DB for IP-to-country mapping
• 🧱 Simple tower::Layer and tower::Service integration
• 🧪 Tested with mock MaxMind DB and real IPs

🚀 Usage

1. Add to your project

cargo add axum-tariff

2. Add the middleware

use axum::{routing::get, Router};
use std::{net::IpAddr, time::Duration};
use axum_tariff::Config;
use maxminddb::Reader;

#[tokio::main]
async fn main() {
    let reader = Reader::open_readfile("assets/GeoLite2-Country-Test.mmdb").unwrap();

    let layer = Config::new(reader)
        .with("US", Duration::from_secs(1))
        .with("FR", Duration::from_millis(500))
        .into_layer();

    let app: Router<()> = Router::new()
        .route("/", get(|| async { "Hello, world!" }))
        .layer(layer);


    let listener = tokio::net::TcpListener::bind("127.0.1.1:3000").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

🧪 Running the Tests

This crate includes tests that use the GeoLite2-Country-Test.mmdb. You'll need to place it at:

assets/GeoLite2-Country-Test.mmdb

Then:

cargo test

📦 Example: Applying a 2s delay to China

let config = Config::new(reader)
    .with("CN", Duration::from_secs(2));

📄 License

MIT