feat: surveyor fetches concurrently

also catch more errors and log more

src/worker/surveyor.rs

@@ -1,7 +1,9 @@
+use std::sync::Arc;
+
 use chrono::Utc;
 use sea_orm::{DatabaseConnection, ActiveValue::NotSet, Set, EntityTrait};
 use tokio::sync::watch;
-use tracing::error;
+use tracing::{error, info};
 
 use crate::data::{entities, FetchError};
 
@@ -15,26 +17,24 @@ pub async fn surveyor_loop(
 	cache_time:i64,
 	run: watch::Receiver<bool>,
 ) {
-	let mut last_check = Utc::now().timestamp();
+	let mut last_activation = Utc::now().timestamp();
 	let mut last_fetch = 0;
 	let mut sources = vec![];
-	let mut metrics = vec![];
+	let mut metrics = Arc::new(vec![]);
+
 	while *run.borrow() {
 		// sleep until next activation
-		let delta_time = (interval as i64) - (Utc::now().timestamp() - last_check);
+		let delta_time = (interval as i64) - (Utc::now().timestamp() - last_activation);
 		if delta_time > 0 {
 			tokio::time::sleep(std::time::Duration::from_secs(delta_time as u64)).await;
 		}
-		last_check = Utc::now().timestamp();
+		last_activation = Utc::now().timestamp();
 
 		if Utc::now().timestamp() - last_fetch > cache_time {
 			// TODO do both concurrently
-			let res = tokio::join!(
-				entities::sources::Entity::find().all(&db),
-				entities::metrics::Entity::find().all(&db)
-			);
-			sources = res.0.unwrap();
-			metrics = res.1.unwrap();
+			sources = entities::sources::Entity::find().all(&db).await.unwrap();
+			metrics = Arc::new(entities::metrics::Entity::find().all(&db).await.unwrap());
+			info!(target: "surveyor", "Reloaded sources and metrics");
 			last_fetch = Utc::now().timestamp();
 		}
 
@@ -43,39 +43,42 @@ pub async fn surveyor_loop(
 				continue;
 			}
 
-			// source.last_fetch = Utc::now(); // TODO! do it in background threads again!
-			// tokio::spawn(async move {
-				match fetch(&source.url).await {
+			let metrics_snapshot = metrics.clone();
+			let db_clone = db.clone();
+			let source_clone = source.clone();
+			let now = Utc::now().timestamp();
+			source.last_update = now; // TODO kinda meh
+			// we set this before knowing about fetch result, to avoid re-running a fetch
+			// next time this loop runs. But the task only sets last_update on db if fetch succeeds,
+			// so if an error happens the client and server last_update fields will differ until fetched
+			// again. This could be avoided by keeping track of which threads are trying which sources,
+			// but also only trying to fetch at certain intervals to stay aligned might be desirable.
+			tokio::spawn(async move {
+				match fetch(&source_clone.url).await {
 					Ok(res) => {
-						let now = Utc::now().timestamp();
-						entities::sources::Entity::update(
-							entities::sources::ActiveModel{id: Set(source.id), last_update: Set(now), ..Default::default()}
-						).exec(&db).await.unwrap();
-						source.last_update = now;
-						for metric in metrics.iter().filter(|x| source.id == x.source_id) {
+						if let Err(e) = entities::sources::Entity::update(
+							entities::sources::ActiveModel{id: Set(source_clone.id), last_update: Set(now), ..Default::default()}
+						).exec(&db_clone).await {
+							error!(target: "surveyor", "Failed setting last_update ({:?}) for source {:?} but successfully fetched '{}', aborting", e, source_clone, res);
+							return;
+						}
+						for metric in metrics_snapshot.iter().filter(|x| source_clone.id == x.source_id) {
 							match metric.extract(&res) {
 								Ok(v) => {
-									entities::points::Entity::insert(
+									if let Err(e) = entities::points::Entity::insert(
 										entities::points::ActiveModel {
 											id: NotSet, metric_id: Set(metric.id), x: Set(v.x), y: Set(v.y),
-									}).exec(&db).await.unwrap();
+									}).exec(&db_clone).await {
+										error!(target: "surveyor", "Could not insert record {:?} : {:?}", v, e);
+									}
 								},
-								Err(e) => error!(target: "worker", "Failed extracting '{}' from {}: {:?}", metric.name, source.name, e),
+								Err(e) => error!(target: "surveyor", "Failed extracting '{}' from {}: {:?}", metric.name, source_clone.name, e),
 							}
 						}
 					},
-					Err(e) => error!(target: "worker", "Failed fetching {}: {:?}", source.name, e),
+					Err(e) => error!(target: "surveyor", "Failed fetching {}: {:?}", source_clone.name, e),
 				}
-				// source.last_fetch = Utc::now(); // TODO!
-			// });
-
+			});
 		}
-
-		// if let Ok(meta) = std::fs::metadata(state.file_path.clone()) {
-		// 	let mut fsize = state.file_size.write().expect("File Size RwLock poisoned");
-		// 	*fsize = meta.len();
-		// } // ignore errors
-
-		// ctx.request_repaint();
 	}
 }