update: ptth_server metrics are at a stopping point for now

crates/ptth_server/src/file_server/metrics.rs

@@ -1,4 +1,7 @@
-use std::sync::Arc;
+use std::{
+	sync::Arc,
+	time::{Duration, Instant},
+};
 
 use arc_swap::ArcSwap;
 use chrono::{DateTime, Utc};
@@ -35,6 +38,8 @@ pub struct Startup {
 
 #[derive (Debug, serde::Serialize)]
 pub struct Interval {
+	#[serde (skip)]
+	pub at: Instant,
 	pub utc: DateTime <Utc>,
 	pub rss_mib: u64,
 	
@@ -94,6 +99,7 @@ impl Interval {
 		let rss_mib = mem.rss ().get::<mebibyte> ();
 		
 		let x = Self {
+			at: Instant::now (),
 			utc: Utc::now (),
 			rss_mib,
 			cpu_usage,
@@ -104,15 +110,53 @@ impl Interval {
 	
 	pub async fn monitor (interval_writer: Arc <ArcSwap <Option <Interval>>>)
 	{
-		use std::time::Duration;
-		
 		use uom::si::ratio::percent;
 		
 		let mut interval = tokio::time::interval (Duration::from_secs (60));
 		
+		#[derive (Default)]
+		struct Window {
+			window_length: u64,
+			next_interval: u64,
+			last_metrics: Arc <Option <Interval>>,
+		}
+		
+		impl Window {
+			fn new (window_length: u64) -> Self {
+				Window {
+					window_length,
+					next_interval: 0,
+					last_metrics: Default::default (),
+				}
+			}
+			
+			fn update (
+				&mut self, 
+				counter: u64, 
+				new_metrics: &Arc <Option <Interval>>
+			) {
+				if counter >= self.next_interval {
+					if let (Some (old), Some (new)) = (&*self.last_metrics, &**new_metrics) {
+						let diff = new.cpu_usage.clone () - old.cpu_usage.clone ();
+						trace! (
+							"CPU usage over {} s: {}%", 
+							(new.at - old.at).as_secs (),
+							diff.get::<percent> (),
+						);
+					}
+					
+					self.next_interval += self.window_length;
+					self.last_metrics = new_metrics.clone ();
+				}
+			}
+		}
+		
 		let mut counter = 0_u64;
-		let mut next_10_time = counter;
+		
-		let mut metrics_at_last_10: Arc <Option <Interval>> = Arc::new (None);
+		let mut windows = [1, 5, 10, 60, 1440]
+		.iter ()
+		.map (|len| Window::new (*len))
+		.collect::<Vec <_>> ();
 		
 		loop {
 			interval.tick ().await;
@@ -126,14 +170,8 @@ impl Interval {
 			};
 			let new_interval_metrics = Arc::new (Some (new_interval_metrics));
 			
-			if counter >= next_10_time {
+			for window in windows.iter_mut () {
-				if let (Some (old), Some (new)) = (&*metrics_at_last_10, &*new_interval_metrics) {
+				window.update (counter, &new_interval_metrics);
-					let diff = new.cpu_usage.clone () - old.cpu_usage.clone ();
-					trace! ("CPU usage: {}%", diff.get::<percent> ());
-				}
-				
-				next_10_time += 1;
-				metrics_at_last_10 = new_interval_metrics.clone ();
 			}
 			
 			interval_writer.store (new_interval_metrics);