Configuring the AWS SDK for Rust

main.rs

use tracing_subscriber::EnvFilter;
use clap::Parser;
use aws_config::{Region, meta::region::RegionProviderChain};

#[derive(Parser)]
struct Opt {
    region: Option<String>
}

#[tokio::main]
async fn main() {
    // Configure tracing:
    tracing_subscriber::fmt()
        .with_env_filter(
            EnvFilter::from_default_env()
                .add_directive(tracing::Level::INFO.into())
        )
        .with_writer(std::io::stderr)
        .with_ansi(true)
        .init();

    // Parsing command line parameters
    let Opt {
        region
    } = Opt::parse();

    // Configure the region provider chain
    let region_provider = RegionProviderChain::first_try(region.map(Region::new))
        .or_default_provider() // Env -> Profile -> EC2 IMDSv2
        .or_else(Region::new("us-east-1"));

    // Configure the SDK:
    let sdk_config = aws_config::from_env() // Uses the BehaviorVersion::latest
        .region(region_provider)
        .profile_name("personal")
        .endpoint_url("http://localhost:4566") // For LocalStack
        .load().await;

    // Configure the client
    let s3_client = aws_sdk_s3::Client::new(&sdk_config);

    // Get the current region used:
    tracing::info!("Region selected: {:?}", sdk_config.region().unwrap());

    // Running any SDK call so the SDK would emit what credentials are used
    let buckets = s3_client.list_buckets().send().await.unwrap();
    println!("Buckets: {:#?}", buckets.buckets());
}