feat: add simple health check

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn/.gitignore

@@ -0,0 +1 @@
+/target

crates/churn/Cargo.toml

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+[package]
+name = "churn"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+clap.workspace = true
+dotenv.workspace = true
+axum.workspace = true

crates/churn/src/main.rs

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+use std::net::SocketAddr;
+
+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 {
+    Bootstrap {
+        #[arg(env = "CHURN_AGENT", long)]
+        host: String,
+
+        #[arg(env = "CHURN_SERVER", long)]
+        server: String,
+
+        #[arg(env = "CHURN_SERVER_TOKEN", long)]
+        server_token: String,
+    },
+    Health {
+        #[arg(env = "CHURN_SERVER", long)]
+        server: String,
+        #[arg(env = "CHURN_AGENT", long)]
+        agent: 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<()> {
+    if let Some(cmd) = cmd.command {
+        match cmd {
+            Commands::Bootstrap {
+                host,
+                server,
+                server_token,
+            } => todo!(),
+            Commands::Health { server, agent } => {
+                tracing::info!("connecting to server: {}", server);
+                tokio::time::sleep(std::time::Duration::from_secs(5)).await;
+                tracing::info!("connecting to agent: {}", agent);
+                tokio::time::sleep(std::time::Duration::from_secs(5)).await;
+                Ok(())
+            }
+        }
+    } else {
+        panic!("no command supplied")
+    }
+}