Simplify health endpoint

apps/api/src/routes/api/health/info.rs

@@ -1,9 +1,8 @@
 use std::sync::Arc;
 
 use axum::{Json, extract::State, http::StatusCode};
-use chrono::{Duration, Utc};
+use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
-use tokio::time::Instant;
 
 use crate::routes::api::health::state::HealthState;
 
@@ -14,43 +13,34 @@ const STATUS_UNHEALTHY: &str = "unhealthy";
 pub struct HealthInfo {
     pub status: String,
     pub version: String,
-    // timestamp in milliseconds when the service started
+    // RFC 3339 formatted timestamp
-    pub up_since: String,
+    pub up_since: DateTime<Utc>,
     pub errors: Option<Vec<String>>,
 }
 
 pub async fn get_health_info(
     State(state): State<Arc<HealthState>>,
 ) -> (StatusCode, Json<HealthInfo>) {
+    #[allow(unused_mut)]
     let mut errors = vec![];
-    let up_since = if *state.get_start_time() > Instant::now() {
+
-        errors.push("Invalid up time".into());
+    let is_healthy = errors.is_empty();
-        // Fall back to reporting 'now' as the up_since timestamp when invalid.
-        Utc::now()
-    } else {
-        let elapsed = state.get_start_time().elapsed();
-        Utc::now()
-            - Duration::from_std(elapsed).unwrap_or_else(|_| {
-                errors.push("Invalid up time".into());
-                Duration::zero()
-            })
-    };
 
     (
-        StatusCode::OK,
+        if is_healthy {
+            StatusCode::OK
+        } else {
+            StatusCode::SERVICE_UNAVAILABLE
+        },
         Json(HealthInfo {
-            status: if errors.is_empty() {
+            status: if is_healthy {
                 STATUS_HEALTHY.into()
             } else {
                 STATUS_UNHEALTHY.into()
             },
             version: env!("CARGO_PKG_VERSION").into(),
-            up_since: up_since.to_rfc3339(),
+            up_since: *state.get_start_at(),
-            errors: if errors.is_empty() {
+            errors: if is_healthy { None } else { Some(errors) },
-                None
-            } else {
-                Some(errors)
-            },
         }),
     )
 }
@@ -85,24 +75,4 @@ mod test {
         assert_eq!(health_info.version, env!("CARGO_PKG_VERSION"));
         assert!(health_info.errors.is_none());
     }
-
-    #[tokio::test]
-    async fn test_invalid_up_time() {
-        let health_state = Arc::new(HealthState::new(
-            tokio::time::Instant::now() + std::time::Duration::from_secs(60000),
-        ));
-        let app = Router::new()
-            .route("/info", axum::routing::get(get_health_info))
-            .with_state(health_state);
-        let response = app
-            .oneshot(Request::builder().uri("/info").body(Body::empty()).unwrap())
-            .await
-            .unwrap();
-        assert_eq!(response.status(), StatusCode::OK);
-        let body = to_bytes(response.into_body(), 1024 * 1024).await.unwrap(); // Set limit to 1 MB
-        let health_info: HealthInfo = serde_json::from_slice(&body).unwrap();
-        assert_eq!(health_info.status, STATUS_UNHEALTHY);
-        assert_eq!(health_info.version, env!("CARGO_PKG_VERSION"));
-        assert!(health_info.errors.as_ref().is_some_and(|e| !e.is_empty()));
-    }
 }

apps/api/src/routes/api/health/state.rs

@@ -1,24 +1,19 @@
-use tokio::time::Instant;
+use chrono::{DateTime, Utc};
 
 pub struct HealthState {
-    start_time: Instant,
+    start_at: DateTime<Utc>,
 }
 
 impl Default for HealthState {
     fn default() -> Self {
         Self {
-            start_time: Instant::now(),
+            start_at: Utc::now(),
         }
     }
 }
 
 impl HealthState {
-    #[allow(dead_code)] // used in tests
+    pub fn get_start_at(&self) -> &DateTime<Utc> {
-    pub fn new(start_time: Instant) -> Self {
+        &self.start_at
-        Self { start_time }
-    }
-
-    pub fn get_start_time(&self) -> &Instant {
-        &self.start_time
     }
 }