refactor(client): encapsulate SignedDuration and enhance its API

Hide internal fields to improve type safety and provide helper methods for unit conversions and negative value checks. Fix several feature-gated test compilation issues.

crates/irtt-cli/src/lib.rs

@@ -774,7 +774,7 @@ fn duration_us(duration: Duration) -> u128 {
 }
 
 fn signed_duration_us(duration: SignedDuration) -> i128 {
-    duration.ns / 1_000
+    duration.as_micros()
 }
 
 fn format_optional_duration(duration: Option<Duration>) -> String {
@@ -788,7 +788,7 @@ fn format_duration(duration: Duration) -> String {
 }
 
 fn format_signed_duration(duration: SignedDuration) -> String {
-    format_signed_ns(duration.ns as f64)
+    format_signed_ns(duration.as_nanos() as f64)
 }
 
 fn format_signed_ns(ns: f64) -> String {
@@ -869,8 +869,8 @@ mod tests {
             received_at: test_timestamp(Duration::from_secs(1) + Duration::from_micros(1500)),
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: Some(1_000),
@@ -894,6 +894,7 @@ mod tests {
         }
     }
 
+    #[cfg(feature = "stats")]
     fn negative_adjusted_reply_event() -> ClientEvent {
         ClientEvent::EchoReply {
             seq: 8,
@@ -902,8 +903,8 @@ mod tests {
             received_at: test_timestamp(Duration::from_secs(1) + Duration::from_micros(500)),
             rtt: RttSample {
                 raw: Duration::from_micros(500),
-                adjusted: Some(SignedDuration { ns: -1_500_000 }),
-                effective: SignedDuration { ns: -1_500_000 },
+                adjusted: Some(SignedDuration::from_nanos(-1_500_000)),
+                effective: SignedDuration::from_nanos(-1_500_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: Some(1_000),

crates/irtt-cli/src/main.rs

@@ -15,7 +15,7 @@ use irtt_cli::{
 };
 use irtt_client::{Client, ClientEvent, OpenOutcome, RecvBudget};
 
-#[cfg(test)]
+#[cfg(all(test, feature = "stats"))]
 use irtt_client::ClientTimestamp;
 
 #[cfg(feature = "stats")]
@@ -247,9 +247,14 @@ impl<W: Write> StreamOutput<'_, W> {
 
         let line =
             if self.mode == OutputMode::Human && !matches!(event, ClientEvent::EchoSent { .. }) {
+                #[cfg(feature = "stats")]
+                let human_stats = stats_update.into();
+                #[cfg(not(feature = "stats"))]
+                let human_stats = stats_update;
+
                 Some(format_human_event_with_options(
                     event,
-                    Some(stats_update.into()),
+                    Some(human_stats),
                     self.human_options,
                 ))
             } else {
@@ -426,9 +431,7 @@ mod tests {
             rtt: RttSample {
                 raw: Duration::from_micros(rtt_us),
                 adjusted: None,
-                effective: SignedDuration {
-                    ns: i128::from(rtt_us) * 1_000,
-                },
+                effective: SignedDuration::from_nanos(i128::from(rtt_us) * 1_000),
             },
             server_timing: None,
             one_way: None,
@@ -466,7 +469,7 @@ mod tests {
                 rtt: RttSample {
                     raw: Duration::from_micros(1200),
                     adjusted: None,
-                    effective: SignedDuration { ns: 1_200_000 },
+                    effective: SignedDuration::from_nanos(1_200_000),
                 },
                 server_timing: None,
                 one_way: None,
@@ -579,7 +582,7 @@ mod tests {
                 rtt: RttSample {
                     raw: Duration::from_micros(1),
                     adjusted: None,
-                    effective: SignedDuration { ns: 1_000 },
+                    effective: SignedDuration::from_nanos(1_000),
                 },
                 server_timing: None,
                 one_way: None,

crates/irtt-cli/src/summary.rs

@@ -206,8 +206,8 @@ mod tests {
             received_at,
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: None,
@@ -252,8 +252,8 @@ mod tests {
             received_at,
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: None,
             one_way: None,

crates/irtt-client/src/client.rs

@@ -727,9 +727,8 @@ fn compute_rtt(
 
     let server_processing = compute_server_processing(ts);
 
-    let adjusted = server_processing.map(|sp| SignedDuration {
-        ns: duration_ns_i128(raw) - duration_ns_i128(sp),
-    });
+    let adjusted = server_processing
+        .map(|sp| SignedDuration::from_nanos(duration_ns_i128(raw) - duration_ns_i128(sp)));
     let effective = adjusted.unwrap_or_else(|| SignedDuration::from_duration(raw));
 
     RttSample {

crates/irtt-client/src/client/tests/probes_replies/reply_metadata.rs

@@ -1,3 +1,4 @@
+#[cfg(all(target_os = "linux", feature = "ancillary"))]
 use super::*;
 
 #[test]

crates/irtt-client/src/client/tests/probes_replies/timing_math.rs

@@ -18,8 +18,8 @@ fn server_processing_greater_than_raw_does_not_underflow() {
             ..Default::default()
         },
     );
-    assert_eq!(rtt.adjusted, Some(SignedDuration { ns: -999_999_999 }));
-    assert_eq!(rtt.effective, SignedDuration { ns: -999_999_999 });
+    assert_eq!(rtt.adjusted, Some(SignedDuration::from_nanos(-999_999_999)));
+    assert_eq!(rtt.effective, SignedDuration::from_nanos(-999_999_999));
 }
 
 #[test]

crates/irtt-client/src/event.rs

@@ -117,17 +117,37 @@ pub struct RttSample {
     pub effective: SignedDuration,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub struct SignedDuration {
-    pub ns: i128,
+    ns: i128,
 }
 
 impl SignedDuration {
+    pub const fn from_nanos(ns: i128) -> Self {
+        Self { ns }
+    }
+
     pub fn from_duration(duration: Duration) -> Self {
         Self {
             ns: i128::try_from(duration.as_nanos()).unwrap_or(i128::MAX),
         }
     }
+
+    pub const fn as_nanos(self) -> i128 {
+        self.ns
+    }
+
+    pub const fn as_micros(self) -> i128 {
+        self.ns / 1_000
+    }
+
+    pub const fn as_millis(self) -> i128 {
+        self.ns / 1_000_000
+    }
+
+    pub const fn is_negative(self) -> bool {
+        self.ns < 0
+    }
 }
 
 impl From<Duration> for SignedDuration {
@@ -170,18 +190,3 @@ pub struct PacketMeta {
     pub ecn: Option<u8>,
     pub kernel_rx_timestamp: Option<std::time::SystemTime>,
 }
-
-#[cfg(test)]
-mod tests {
-    use super::PacketMeta;
-
-    #[test]
-    fn packet_meta_default_is_unavailable() {
-        let meta = PacketMeta::default();
-
-        assert_eq!(meta.traffic_class, None);
-        assert_eq!(meta.dscp, None);
-        assert_eq!(meta.ecn, None);
-        assert_eq!(meta.kernel_rx_timestamp, None);
-    }
-}

crates/irtt-client/tests/protocol_options.rs

@@ -352,7 +352,7 @@ fn assert_processing_subtracted(reply: ReplyView<'_>) {
     assert_eq!(processing, Duration::from_nanos(1));
     let adjusted = reply.rtt.adjusted.unwrap();
     assert_eq!(reply.rtt.effective, adjusted);
-    assert!(adjusted.ns < SignedDuration::from_duration(reply.rtt.raw).ns);
+    assert!(adjusted < SignedDuration::from_duration(reply.rtt.raw));
 }
 
 fn assert_one_way_presence(

crates/irtt-stats/src/normalization.rs

@@ -203,7 +203,7 @@ fn duration_ns_i128(duration: Duration) -> i128 {
 }
 
 fn signed_duration_ns(duration: SignedDuration) -> i128 {
-    duration.ns
+    duration.as_nanos()
 }
 
 #[cfg(test)]

crates/irtt-stats/tests/common/mod.rs

@@ -12,14 +12,21 @@ pub fn ts(ms: u64) -> ClientTimestamp {
     }
 }
 
-pub fn rtt(raw_ms: u64, effective_ms: i128) -> RttSample {
-    let effective = SignedDuration {
-        ns: effective_ms * 1_000_000,
-    };
+pub fn adjusted_rtt(raw_ms: u64, adjusted_ms: i128) -> RttSample {
+    let adjusted = SignedDuration::from_nanos(adjusted_ms * 1_000_000);
     RttSample {
         raw: Duration::from_millis(raw_ms),
-        adjusted: Some(effective),
-        effective,
+        adjusted: Some(adjusted),
+        effective: adjusted,
+    }
+}
+
+pub fn unadjusted_rtt(raw_ms: u64) -> RttSample {
+    let raw = Duration::from_millis(raw_ms);
+    RttSample {
+        raw,
+        adjusted: None,
+        effective: SignedDuration::from_duration(raw),
     }
 }
 
@@ -35,7 +42,15 @@ pub fn sent(seq: u32, sent_at: ClientTimestamp) -> ClientEvent {
     }
 }
 
-pub fn reply(seq: u32, raw_ms: u64, effective_ms: i128) -> ClientEvent {
+pub fn adjusted_reply(seq: u32, raw_ms: u64, adjusted_ms: i128) -> ClientEvent {
+    reply_with_rtt(seq, raw_ms, adjusted_rtt(raw_ms, adjusted_ms))
+}
+
+pub fn unadjusted_reply(seq: u32, raw_ms: u64) -> ClientEvent {
+    reply_with_rtt(seq, raw_ms, unadjusted_rtt(raw_ms))
+}
+
+fn reply_with_rtt(seq: u32, raw_ms: u64, rtt: RttSample) -> ClientEvent {
     let sent_at = ts(seq as u64 * 10);
     let received_at = ClientTimestamp {
         mono: sent_at.mono + Duration::from_millis(raw_ms),
@@ -46,7 +61,7 @@ pub fn reply(seq: u32, raw_ms: u64, effective_ms: i128) -> ClientEvent {
         remote: "127.0.0.1:2112".parse().unwrap(),
         sent_at,
         received_at,
-        rtt: rtt(raw_ms, effective_ms),
+        rtt,
         server_timing: Some(ServerTiming {
             receive_wall_ns: Some(unix_time_ns_after_epoch(sent_at.wall) as i64 + 1_000_000),
             receive_mono_ns: Some(seq as i64 * 10_000_000 + 1_000_000),
@@ -69,7 +84,11 @@ pub fn reply(seq: u32, raw_ms: u64, effective_ms: i128) -> ClientEvent {
     }
 }
 
-pub fn late_reply(seq: u32, raw_ms: u64, effective_ms: i128) -> ClientEvent {
+pub fn unadjusted_late_reply(seq: u32, raw_ms: u64) -> ClientEvent {
+    late_reply_from(unadjusted_reply(seq, raw_ms))
+}
+
+fn late_reply_from(reply: ClientEvent) -> ClientEvent {
     let ClientEvent::EchoReply {
         seq,
         remote,
@@ -82,7 +101,7 @@ pub fn late_reply(seq: u32, raw_ms: u64, effective_ms: i128) -> ClientEvent {
         bytes,
         packet_meta,
         ..
-    } = reply(seq, raw_ms, effective_ms)
+    } = reply
     else {
         unreachable!();
     };

crates/irtt-stats/tests/stats.rs

@@ -2,19 +2,20 @@ mod common;
 
 use std::time::{Duration, Instant};
 
-use common::{late_reply, reply, sent, ts};
+use common::{adjusted_reply, sent, ts, unadjusted_late_reply, unadjusted_reply};
 use irtt_client::{ClientEvent, PacketMeta};
 use irtt_stats::{EventStatsUpdate, IpdvPairUpdate, SampleMode, StatsCollector, StatsConfig};
 
 #[test]
 fn running_only_samples_avoid_finite_retention() {
     let mut collector = StatsCollector::new(StatsConfig::continuous());
-    collector.process(&reply(0, 10, 9));
-    collector.process(&reply(1, 20, 19));
+    collector.process(&unadjusted_reply(0, 10));
+    collector.process(&unadjusted_reply(1, 20));
 
     let snapshot = collector.snapshot();
     assert_eq!(snapshot.rtt.primary.median_ns, None);
     assert_eq!(snapshot.rtt.raw.median_ns, None);
+    assert_eq!(snapshot.rtt.adjusted.count, 0);
     assert_eq!(snapshot.rtt.adjusted.median_ns, None);
     assert_eq!(snapshot.ipdv.round_trip.median_ns, None);
     assert_eq!(snapshot.one_way_delay.send_delay.median_ns, None);
@@ -25,7 +26,7 @@ fn running_only_samples_avoid_finite_retention() {
 fn continuous_mode_tracks_running_samples_without_exact_medians() {
     let mut collector = StatsCollector::new(StatsConfig::continuous());
     for seq in 0..4104 {
-        collector.process(&reply(seq, 10, 10));
+        collector.process(&unadjusted_reply(seq, 10));
     }
 
     let snapshot = collector.snapshot();
@@ -38,14 +39,15 @@ fn continuous_mode_tracks_running_samples_without_exact_medians() {
 #[test]
 fn cumulative_rtt_uses_signed_effective_and_tracks_raw() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    collector.process(&reply(0, 1, -2));
-    collector.process(&reply(1, 10, 8));
+    collector.process(&adjusted_reply(0, 1, -2));
+    collector.process(&adjusted_reply(1, 10, 8));
 
     let snapshot = collector.snapshot();
     assert_eq!(snapshot.rtt.primary.count, 2);
     assert_eq!(snapshot.rtt.primary.min_ns, Some(-2_000_000));
     assert_eq!(snapshot.rtt.primary.median_ns, Some(3_000_000.0));
     assert_eq!(snapshot.rtt.raw.total_ns, 11_000_000);
+    assert_eq!(snapshot.rtt.adjusted.count, 2);
 }
 
 #[test]
@@ -53,8 +55,8 @@ fn late_unique_counts_and_duplicates_do_not_update_duplicate_measurements() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
     collector.process(&sent(0, ts(0)));
     collector.process(&sent(1, ts(10)));
-    collector.process(&reply(1, 10, 9));
-    collector.process(&late_reply(0, 20, 19));
+    collector.process(&unadjusted_reply(1, 10));
+    collector.process(&unadjusted_late_reply(0, 20));
     collector.process(&ClientEvent::DuplicateReply {
         seq: 0,
         remote: "127.0.0.1:2112".parse().unwrap(),
@@ -84,7 +86,7 @@ fn final_loss_uses_sent_minus_unique_replies_not_echo_loss_events() {
         sent_at: ts(0),
         timeout_at: Instant::now(),
     });
-    collector.process(&late_reply(0, 10, 9));
+    collector.process(&unadjusted_late_reply(0, 10));
 
     let snapshot = collector.snapshot();
     assert_eq!(snapshot.events.loss_events, 1);
@@ -114,9 +116,9 @@ fn assert_one_ipdv_pair(
 #[test]
 fn ipdv_is_sequence_adjacent_and_gap_preserving() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    let first = collector.process(&reply(0, 10, 10));
-    let gap = collector.process(&reply(2, 15, 15));
-    let adjacent = collector.process(&reply(3, 12, 12));
+    let first = collector.process(&unadjusted_reply(0, 10));
+    let gap = collector.process(&unadjusted_reply(2, 15));
+    let adjacent = collector.process(&unadjusted_reply(3, 12));
 
     let snapshot = collector.snapshot();
     assert!(first.contributed_sample);
@@ -134,8 +136,8 @@ fn ipdv_is_sequence_adjacent_and_gap_preserving() {
 #[test]
 fn late_reply_can_complete_ipdv_pair() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    collector.process(&reply(1, 20, 20));
-    let update = collector.process(&late_reply(0, 10, 10));
+    collector.process(&unadjusted_reply(1, 20));
+    let update = collector.process(&unadjusted_late_reply(0, 10));
 
     let snapshot = collector.snapshot();
 
@@ -149,8 +151,8 @@ fn late_reply_can_complete_ipdv_pair() {
 #[test]
 fn update_exposes_directional_ipdv_when_available() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    collector.process(&reply(0, 10, 10));
-    let update = collector.process(&reply(1, 13, 13));
+    collector.process(&unadjusted_reply(0, 10));
+    let update = collector.process(&unadjusted_reply(1, 13));
 
     assert!(update.contributed_sample);
 
@@ -163,9 +165,9 @@ fn update_exposes_directional_ipdv_when_available() {
 fn gap_fill_update_exposes_both_completed_ipdv_pairs() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
 
-    let first = collector.process(&reply(0, 10, 10));
-    let gap = collector.process(&reply(2, 20, 20));
-    let fill = collector.process(&reply(1, 13, 13));
+    let first = collector.process(&unadjusted_reply(0, 10));
+    let gap = collector.process(&unadjusted_reply(2, 20));
+    let fill = collector.process(&unadjusted_reply(1, 13));
 
     assert!(first.contributed_sample);
     assert!(first.ipdv_pairs.is_empty());
@@ -192,7 +194,7 @@ fn gap_fill_update_exposes_both_completed_ipdv_pairs() {
 #[test]
 fn server_processing_and_one_way_require_available_samples() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    collector.process(&reply(0, 10, 9));
+    collector.process(&unadjusted_reply(0, 10));
     collector.process(&ClientEvent::LateReply {
         seq: 9,
         highest_seen: 10,
@@ -220,8 +222,8 @@ fn server_processing_and_one_way_require_available_samples() {
 #[test]
 fn older_cumulative_server_receive_count_does_not_regress() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
-    collector.process(&reply(1, 10, 10));
-    collector.process(&late_reply(0, 10, 10));
+    collector.process(&unadjusted_reply(1, 10));
+    collector.process(&unadjusted_late_reply(0, 10));
 
     let snapshot = collector.snapshot();
     assert_eq!(snapshot.packets.server_packets_received, Some(2));
@@ -235,8 +237,8 @@ fn rolling_count_eviction_recomputes_from_bounded_events() {
         rolling_time: None,
     });
     collector.process(&sent(0, ts(0)));
-    collector.process(&reply(0, 10, 10));
-    collector.process(&reply(1, 20, 20));
+    collector.process(&unadjusted_reply(0, 10));
+    collector.process(&unadjusted_reply(1, 20));
 
     let rolling = collector.rolling_count().unwrap();
     assert_eq!(rolling.packets.packets_sent, 0);
@@ -276,7 +278,7 @@ fn directional_loss_uses_server_received_count_when_available() {
     let mut collector = StatsCollector::new(StatsConfig::finite());
     collector.process(&sent(0, ts(0)));
     collector.process(&sent(1, ts(10)));
-    collector.process(&reply(0, 10, 10));
+    collector.process(&unadjusted_reply(0, 10));
 
     let loss = collector.snapshot().loss;
     assert_eq!(loss.lost_packets, 1);