Add html page

src/health/mod.rs

@@ -31,18 +31,24 @@ pub enum HttpHealthCheckMode {
 }
 
 pub struct HealthState {
+    pub last_update: Mutex<Option<DateTime<Utc>>>,
     pub health: HashMap<ServiceId, Mutex<Option<HealthStatus>>>,
     pub config: HealthConfig,
 }
 
 #[derive(Serialize, Deserialize)]
 pub struct HealthConfig {
+    /// The time between updates (in seconds)
+    pub update_period: u64,
+
+    /// The list of services
     pub services: HashMap<ServiceId, ServiceConfig>,
 }
 
 impl HealthState {
     pub fn new(config: HealthConfig) -> HealthState {
         HealthState {
+            last_update: Mutex::new(None),
             health: config
                 .services
                 .iter()
@@ -53,6 +59,8 @@ impl HealthState {
     }
 
     pub async fn update(&self) {
+        *self.last_update.lock().await = Some(Utc::now());
+
         for (id, status) in &self.health {
             let url = &self.config.services[id].url;
             info!("service [{}] querying {}", id, url);