churn/crates/churn-agent/src/main.rs

use std::net::SocketAddr;

use axum::{response::IntoResponse, routing::get, Router};
use clap::{Parser, Subcommand};

#[derive(Parser)]
#[command(author, version, about, long_about = None, subcommand_required = true)]
struct Command {
    #[command(subcommand)]
    command: Option<Commands>,
}

#[derive(Subcommand)]
enum Commands {
    Daemon {
        #[arg(env = "CHURN_ADDR", long)]
        host: SocketAddr,
    },

    Connect {
        /// agent name is the hostname which other agents or servers can resolve and connect via. It should be unique
        #[arg(env = "CHURN_AGENT_NAME", long)]
        agent_name: String,

        #[arg(env = "CHURN_ADDR", long)]
        host: SocketAddr,

        #[arg(env = "CHURN_TOKEN", long)]
        token: String,
    },
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    dotenv::dotenv().ok();
    tracing_subscriber::fmt::init();

    let cli = Command::parse();

    handle_command(cli).await?;

    Ok(())
}

async fn handle_command(cmd: Command) -> anyhow::Result<()> {
    match cmd.command {
        Some(Commands::Daemon { host }) => {
            tracing::info!("Starting churn server");

            let app = Router::new().route("/ping", get(ping));

            tracing::info!("churn server listening on {}", host);
            axum::Server::bind(&host)
                .serve(app.into_make_service())
                .await
                .unwrap();

            Ok(())
        }
        Some(Commands::Connect {
            host,
            token,
            agent_name,
        }) => todo!(),
        None => todo!(),
    }
}

async fn ping() -> impl IntoResponse {
    "pong!"
}