add ping endpoint and healthcheck command

src/commands/health.rs

@@ -0,0 +1,25 @@
+use crate::config::HttpConfig;
+use clap::Parser;
+use http::Method;
+
+#[derive(Parser, Debug)]
+pub struct HealthArgs {}
+
+/// Healthcheck for running rustical instance
+/// Currently just pings to see if it's reachable via HTTP
+pub async fn cmd_health(http_config: HttpConfig, _health_args: HealthArgs) -> anyhow::Result<()> {
+    let client = reqwest::ClientBuilder::new().build().unwrap();
+
+    let endpoint = format!(
+        "http://{host}:{port}/ping",
+        host = http_config.host,
+        port = http_config.port
+    )
+    .parse()
+    .unwrap();
+    let request = reqwest::Request::new(Method::GET, endpoint);
+
+    assert!(client.execute(request).await.unwrap().status().is_success());
+
+    Ok(())
+}

src/commands/mod.rs

@@ -5,7 +5,8 @@ use crate::config::{
 use clap::Parser;
 use rustical_frontend::FrontendConfig;
 
-mod membership;
+pub mod health;
+pub mod membership;
 pub mod principals;
 
 #[derive(Debug, Parser)]