feat: add agent

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

crates/churn/src/cli.rs

@@ -2,19 +2,28 @@ use std::net::SocketAddr;
 
 use clap::{Parser, Subcommand};
 
-use crate::{api, state::SharedState};
+use crate::{agent, api, state::SharedState};
 
 pub async fn execute() -> anyhow::Result<()> {
     let state = SharedState::new().await?;
 
     let cli = Command::parse();
-    if let Some(Commands::Serve { host }) = cli.command {
-        tracing::info!("Starting service");
+    match cli.command.expect("to have a subcommand") {
+        Commands::Serve { host } => {
+            tracing::info!("Starting service");
 
-        notmad::Mad::builder()
-            .add(api::Api::new(&state, host))
-            .run()
-            .await?;
+            notmad::Mad::builder()
+                .add(api::Api::new(&state, host))
+                .run()
+                .await?;
+        }
+        Commands::Agent { commands } => match commands {
+            AgentCommands::Start { host } => {
+                tracing::info!("starting agent");
+                agent::execute(host).await?;
+                tracing::info!("shut down agent");
+            }
+        },
     }
 
     Ok(())
@@ -33,4 +42,16 @@ enum Commands {
         #[arg(env = "SERVICE_HOST", long, default_value = "127.0.0.1:3000")]
         host: SocketAddr,
     },
+    Agent {
+        #[command(subcommand)]
+        commands: AgentCommands,
+    },
+}
+
+#[derive(Subcommand)]
+enum AgentCommands {
+    Start {
+        #[arg(env = "SERVICE_HOST", long = "service-host")]
+        host: String,
+    },
 }