feat(measurement): integrate IRTT and configurable reflector selection

Add protocol-aware reflector definitions, TOML/UCI lists, validation and environment overrides. Resolve and select endpoint-aware measurement streams, honor configured ICMP timing and socket routing, and retain partial-set reselection behavior from the standalone fixes.

Drive the managed IRTT task throughout its lifecycle, retry terminal targets without restarting healthy sessions, normalize blank HMAC keys and use effective RTT for latency fallback. Fold the reviewed configuration, resolution and measurement corrections into their implementation.

src/ratecontroller.rs

@@ -7,6 +7,7 @@
 
 use crate::SHUTDOWN;
 use crate::baseliner::ControlSnapshot;
+use crate::measurement::model::MeasurementStream;
 use crate::metrics::{Metric, MetricsSender};
 use crate::platform::{
     InterfaceStatsProvider, PlatformInterfaceStats, PlatformTrafficControl, TrafficControlBackend,
@@ -19,7 +20,6 @@ use flume::{Receiver, Sender};
 use log::{debug, info, warn};
 use std::fs::File;
 use std::io::Write;
-use std::net::IpAddr;
 use std::sync::atomic::Ordering;
 use std::thread::sleep;
 use std::time::{Duration, Instant};
@@ -100,7 +100,7 @@ fn drain_latest_snapshot(
 
 fn deltas_from_snapshot(
     snapshot: Option<&ControlSnapshot>,
-    reflectors: &[IpAddr],
+    reflectors: &[MeasurementStream],
     now: Instant,
     tick_interval: f64,
 ) -> (Vec<f64>, Vec<f64>) {
@@ -123,8 +123,8 @@ fn deltas_from_snapshot(
             up.push(up_delta);
 
             debug!(
-                "Reflector: {} down_delay: {} up_delay: {}",
-                reflector, down_delta, up_delta
+                "Reflector: {} ({:?}) down_delay: {} up_delay: {}",
+                reflector.peer, reflector.source, down_delta, up_delta
             );
         }
     }
@@ -139,7 +139,7 @@ pub struct Ratecontroller<S: InterfaceStatsProvider, T: TrafficControlBackend> {
     settings: Settings,
     control_snapshot: Option<ControlSnapshot>,
     control_snapshot_rx: Receiver<ControlSnapshot>,
-    reflectors_lock: ArcRwLock<Vec<IpAddr>>,
+    reflectors_lock: ArcRwLock<Vec<MeasurementStream>>,
     reselect_trigger: Sender<bool>,
     state_dl: State<T::Handle>,
     state_ul: State<T::Handle>,
@@ -153,7 +153,7 @@ impl<S: InterfaceStatsProvider, T: TrafficControlBackend> Ratecontroller<S, T> {
     fn new_with_backends(
         settings: Settings,
         control_snapshot_rx: Receiver<ControlSnapshot>,
-        reflectors_lock: ArcRwLock<Vec<IpAddr>>,
+        reflectors_lock: ArcRwLock<Vec<MeasurementStream>>,
         reselect_trigger: Sender<bool>,
         metrics: MetricsSender,
         mut stats_provider: S,
@@ -491,8 +491,7 @@ impl<S: InterfaceStatsProvider, T: TrafficControlBackend> Ratecontroller<S, T> {
         self.state_dl.deltas = down_deltas;
         self.state_ul.deltas = up_deltas;
 
-        let minimum =
-            usize::from(self.settings.advanced_settings.num_reflectors).min(reflectors.len());
+        let minimum = usize::from(self.settings.reflectors.num_reflectors).min(reflectors.len());
         if reflectors.is_empty()
             || self.state_dl.deltas.len() < minimum
             || self.state_ul.deltas.len() < minimum
@@ -515,7 +514,7 @@ impl Ratecontroller<PlatformInterfaceStats, PlatformTrafficControl> {
     pub fn new(
         settings: Settings,
         control_snapshot_rx: Receiver<ControlSnapshot>,
-        reflectors_lock: ArcRwLock<Vec<IpAddr>>,
+        reflectors_lock: ArcRwLock<Vec<MeasurementStream>>,
         reselect_trigger: Sender<bool>,
         metrics: MetricsSender,
     ) -> anyhow::Result<Self> {
@@ -536,7 +535,17 @@ impl Ratecontroller<PlatformInterfaceStats, PlatformTrafficControl> {
 mod tests {
     use super::*;
     use crate::baseliner::{EwmaStats, ReflectorState};
+    use crate::measurement::model::{MeasurementSource, MeasurementStreamId};
     use std::collections::HashMap;
+    use std::net::IpAddr;
+
+    fn stream(id: u64, peer: IpAddr) -> MeasurementStream {
+        MeasurementStream {
+            id: MeasurementStreamId(id),
+            peer,
+            source: MeasurementSource::IcmpTimestamp,
+        }
+    }
 
     #[test]
     fn fixed_seed_reproduces_initial_safe_rates() {
@@ -570,7 +579,7 @@ mod tests {
     }
 
     fn snapshot(generated_at: Instant, marker: f64) -> ControlSnapshot {
-        let reflector = "192.0.2.1".parse().unwrap();
+        let reflector = stream(0, "192.0.2.1".parse().unwrap());
         ControlSnapshot {
             generated_at,
             reflectors: HashMap::from([(
@@ -596,7 +605,9 @@ mod tests {
         assert!(rx.is_empty());
         assert_eq!(latest.generated_at, newest_at);
         assert_eq!(
-            latest.reflectors[&"192.0.2.1".parse().unwrap()].recent.down,
+            latest.reflectors[&stream(0, "192.0.2.1".parse().unwrap())]
+                .recent
+                .down,
             2.0
         );
     }
@@ -604,10 +615,10 @@ mod tests {
     #[test]
     fn calculates_sorted_deltas_from_active_fresh_snapshot_state() {
         let now = Instant::now();
-        let first: IpAddr = "192.0.2.1".parse().unwrap();
-        let second: IpAddr = "192.0.2.2".parse().unwrap();
-        let stale: IpAddr = "192.0.2.3".parse().unwrap();
-        let inactive: IpAddr = "192.0.2.4".parse().unwrap();
+        let first = stream(0, "192.0.2.1".parse().unwrap());
+        let second = stream(1, "192.0.2.2".parse().unwrap());
+        let stale = stream(2, "192.0.2.3".parse().unwrap());
+        let inactive = stream(3, "192.0.2.4".parse().unwrap());
         let snapshot = ControlSnapshot {
             generated_at: now,
             reflectors: HashMap::from([