[Fix] Syncronized Webserver & Host behaviour, Fixed the 10 sec default wait on auth

example/client/src/auth.rs

@@ -1,4 +1,4 @@
-use std::time::Instant;
+use std::time::{Duration, Instant};
 
 use tokio::fs;
 
@@ -12,7 +12,7 @@ pub async fn connect_or_register(
     mut config: ClientConfig,
     host_public_key: PublicKeyBundle,
     key_prefix: &str,
-) -> Result<(MTPConnection, Keyring), Box<dyn std::error::Error>> {
+) -> Result<(MTPConnection, Keyring, String, Duration), Box<dyn std::error::Error>> {
     let keyring_path = format!("{key_prefix}.mk");
     let id_path = format!("{key_prefix}.id");
 
@@ -30,12 +30,12 @@ pub async fn connect_or_register(
         config.client_id = client_id;
         let auth_started = Instant::now();
         let conn = MTPClient::auth_connect(config, &keyring, &host_public_key).await?;
+        let auth_duration = auth_started.elapsed();
         println!(
             "Authenticated (version {}) in {:?}",
-            conn.version,
-            auth_started.elapsed()
+            conn.version, auth_duration
         );
-        return Ok((conn, keyring));
+        return Ok((conn, keyring, "connect".into(), auth_duration));
     }
 
     println!("No existing keys found: registering new client");
@@ -52,12 +52,14 @@ pub async fn connect_or_register(
         sig_sk,
     );
 
+    let reg_started = Instant::now();
     let conn = MTPClient::auth_register(config, &keyring, &host_public_key).await?;
-    println!("Registered with ID: {}", conn.client_id);
+    let reg_duration = reg_started.elapsed();
+    println!("Registered with ID: {} in {:?}", conn.client_id, reg_duration);
 
     save_keyring_raw(&keyring, &keyring_path)?;
     fs::write(&id_path, conn.client_id.to_string()).await?;
     println!("Saved client keys -> {keyring_path}");
 
-    Ok((conn, keyring))
+    Ok((conn, keyring, "register".into(), reg_duration))
 }

example/client/src/main.rs

@@ -1,9 +1,11 @@
 mod auth;
+mod metrics;
 mod messages;
 mod pipes;
 
 use std::fs;
 use std::path::Path;
+use std::time::Duration;
 
 use mtp::client::ClientConfig;
 use mtp::files::load_public_key_bundle;
@@ -36,6 +38,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     };
 
+    let mut client_metrics = metrics::ClientMetrics::load("metrics/client_sessions.json");
+
     println!("Connecting to 127.0.0.1:8080 ...");
 
     let config = ClientConfig::new("https://127.0.0.1:8080")
@@ -43,11 +47,43 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .with_description("MTP example client");
 
     let server_bundle = host_public_key.clone();
-    let (conn, keyring) = auth::connect_or_register(config, host_public_key, "client").await?;
-    messages::send_and_receive(&conn, &keyring, &server_bundle).await?;
+    let (conn, keyring, auth_method, auth_duration) =
+        match auth::connect_or_register(config, host_public_key, "client").await {
+            Ok(result) => result,
+            Err(e) => {
+                let mut builder = metrics::SessionBuilder::new("failed", Duration::from_secs(0));
+                builder.set_error(e.to_string());
+                client_metrics.record_session(builder.build());
+                client_metrics.save("metrics/client_sessions.json");
+                client_metrics.build_overview("metrics/client_overview.json");
+                return Err(e);
+            }
+        };
+
+    let mut builder = metrics::SessionBuilder::new(&auth_method, auth_duration);
+
+    let roundtrip = messages::send_and_receive(&conn, &keyring, &server_bundle).await?;
+    builder.set_message_roundtrip(roundtrip);
 
     println!("\n--- Pipe demo ---");
-    pipes::run_pipe_demo(&conn, 1).await?;
+    let pipe_results = pipes::run_pipe_demo(&conn, 1).await?;
+    for result in &pipe_results {
+        builder.add_pipe_result(result.clone());
+    }
+
+    let session_record = builder.build();
+    println!(
+        "\nSession {} complete: auth={}ms, msg_roundtrip={}ms, pipes={} results, pipe_bytes={}",
+        session_record.session_id,
+        session_record.auth_duration_ms,
+        session_record.message_roundtrip_ms,
+        session_record.pipe_results.len(),
+        session_record.total_pipe_bytes,
+    );
+
+    client_metrics.record_session(session_record);
+    client_metrics.save("metrics/client_sessions.json");
+    client_metrics.build_overview("metrics/client_overview.json");
 
     conn.sender.close().await;
     println!("\nDone");

example/client/src/messages.rs

@@ -1,3 +1,5 @@
+use std::time::{Duration, Instant};
+
 use mtp::client::MTPConnection;
 use mtp::codec::{CommunicationType, CommunicationValue, DataType, DataValue};
 use mtp::crypto::{Ed25519Signer, EncryptionType, Keyring, PublicKeyBundle, SigAlgorithm};
@@ -89,17 +91,22 @@ pub async fn send_and_receive(
     conn: &MTPConnection,
     keyring: &Keyring,
     server_bundle: &PublicKeyBundle,
-) -> Result<(), Box<dyn std::error::Error>> {
+) -> Result<Duration, Box<dyn std::error::Error>> {
     let msg = build_demo_message(conn.client_id, keyring, server_bundle)?;
     println!("Sending: {msg}");
+    let start = Instant::now();
     conn.sender.send(&msg).await?;
 
     match conn.receive().await {
         Ok(resp) => {
+            let roundtrip = start.elapsed();
             println!("Received: {resp}");
+            println!("Message round-trip: {:.3}ms", roundtrip.as_secs_f64() * 1000.0);
+            Ok(roundtrip)
+        }
+        Err(e) => {
+            eprintln!("Receive error: {e}");
+            Err(e.into())
         }
-        Err(e) => eprintln!("Receive error: {e}"),
     }
-
-    Ok(())
 }

example/client/src/metrics.rs

@@ -0,0 +1,554 @@
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+
+fn now_epoch_secs() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs()
+}
+
+fn generate_session_id() -> String {
+    let ts = now_epoch_secs();
+    let rand_part: u32 = rand::random();
+    format!("{ts}-{rand_part:08x}")
+}
+
+// ---------------------------------------------------------------------------
+// Persisted data types
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct PipeResult {
+    pub size: usize,
+    pub iteration: usize,
+    pub total_ms: f64,
+    pub data_only_ms: f64,
+    pub bytes_matched: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct ClientSessionRecord {
+    pub session_id: String,
+    pub timestamp: u64,
+    pub auth_method: String,
+    pub auth_duration_ms: f64,
+    pub error: Option<String>,
+    pub message_roundtrip_ms: f64,
+    pub pipe_results: Vec<PipeResult>,
+    pub total_pipe_bytes: u64,
+    pub overall_pipe_avg_total_ms: f64,
+    pub overall_pipe_avg_data_ms: f64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ClientAggregateStats {
+    pub total_sessions: u64,
+    pub auth_failures: u64,
+    pub avg_auth_duration_ms: f64,
+    pub avg_message_roundtrip_ms: f64,
+    pub avg_pipe_total_ms: f64,
+    pub avg_pipe_data_ms: f64,
+    pub total_pipe_bytes: u64,
+    pub avg_pipe_throughput_mbps: f64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ClientOverview {
+    pub total_sessions: u64,
+    pub aggregate: ClientAggregateStats,
+    pub sessions: Vec<ClientSessionRecord>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ClientMetricsFile {
+    pub sessions: Vec<ClientSessionRecord>,
+}
+
+// ---------------------------------------------------------------------------
+// Live metrics state
+// ---------------------------------------------------------------------------
+
+pub struct ClientMetrics {
+    sessions: Vec<ClientSessionRecord>,
+}
+
+impl ClientMetrics {
+    pub fn new() -> Self {
+        Self {
+            sessions: Vec::new(),
+        }
+    }
+
+    pub fn load(path: &str) -> Self {
+        let file = std::fs::read_to_string(path)
+            .ok()
+            .and_then(|s| serde_json::from_str::<ClientMetricsFile>(&s).ok());
+
+        Self {
+            sessions: file.map(|f| f.sessions).unwrap_or_default(),
+        }
+    }
+
+    pub fn save(&self, path: &str) {
+        let data = ClientMetricsFile {
+            sessions: self.sessions.clone(),
+        };
+        if let Some(parent) = Path::new(path).parent() {
+            let _ = std::fs::create_dir_all(parent);
+        }
+        let json = serde_json::to_string_pretty(&data).unwrap_or_default();
+        let _ = std::fs::write(path, json);
+    }
+
+    pub fn record_session(&mut self, record: ClientSessionRecord) {
+        self.sessions.push(record);
+    }
+
+    pub fn build_overview(&self, overview_path: &str) {
+        let total = self.sessions.len() as u64;
+
+        if total == 0 {
+            let overview = ClientOverview {
+                total_sessions: 0,
+                aggregate: ClientAggregateStats::default(),
+                sessions: Vec::new(),
+            };
+            if let Some(parent) = Path::new(overview_path).parent() {
+                let _ = std::fs::create_dir_all(parent);
+            }
+            let json = serde_json::to_string_pretty(&overview).unwrap_or_default();
+            let _ = std::fs::write(overview_path, json);
+            return;
+        }
+
+        let mut auth_sum: f64 = 0.0;
+        let mut msg_sum: f64 = 0.0;
+        let mut pipe_total_sum: f64 = 0.0;
+        let mut pipe_data_sum: f64 = 0.0;
+        let mut total_pipe_bytes: u64 = 0;
+        let mut total_pipe_duration_secs: f64 = 0.0;
+        let mut auth_failures: u64 = 0;
+        let mut success_count: u64 = 0;
+
+        for s in &self.sessions {
+            if s.error.is_some() {
+                auth_failures += 1;
+            } else {
+                success_count += 1;
+                auth_sum += s.auth_duration_ms;
+                msg_sum += s.message_roundtrip_ms;
+                pipe_total_sum += s.overall_pipe_avg_total_ms;
+                pipe_data_sum += s.overall_pipe_avg_data_ms;
+                total_pipe_bytes += s.total_pipe_bytes;
+                for pr in &s.pipe_results {
+                    total_pipe_duration_secs += pr.total_ms / 1000.0;
+                }
+            }
+        }
+
+        let divisor = if success_count > 0 { success_count } else { 1 };
+
+        let aggregate = ClientAggregateStats {
+            total_sessions: total,
+            auth_failures,
+            avg_auth_duration_ms: auth_sum / divisor as f64,
+            avg_message_roundtrip_ms: msg_sum / divisor as f64,
+            avg_pipe_total_ms: pipe_total_sum / divisor as f64,
+            avg_pipe_data_ms: pipe_data_sum / divisor as f64,
+            total_pipe_bytes,
+            avg_pipe_throughput_mbps: if total_pipe_duration_secs > 0.0 {
+                (total_pipe_bytes as f64 / 1_048_576.0) / total_pipe_duration_secs
+            } else {
+                0.0
+            },
+        };
+
+        let overview = ClientOverview {
+            total_sessions: total,
+            aggregate,
+            sessions: self.sessions.clone(),
+        };
+
+        if let Some(parent) = Path::new(overview_path).parent() {
+            let _ = std::fs::create_dir_all(parent);
+        }
+        let json = serde_json::to_string_pretty(&overview).unwrap_or_default();
+        let _ = std::fs::write(overview_path, json);
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Builder for constructing a session record piece by piece
+// ---------------------------------------------------------------------------
+
+pub struct SessionBuilder {
+    session_id: String,
+    timestamp: u64,
+    auth_method: String,
+    auth_duration_ms: f64,
+    error: Option<String>,
+    message_roundtrip_ms: f64,
+    pipe_results: Vec<PipeResult>,
+}
+
+impl SessionBuilder {
+    pub fn new(auth_method: &str, auth_duration: Duration) -> Self {
+        Self {
+            session_id: generate_session_id(),
+            timestamp: now_epoch_secs(),
+            auth_method: auth_method.to_string(),
+            auth_duration_ms: auth_duration.as_secs_f64() * 1000.0,
+            error: None,
+            message_roundtrip_ms: 0.0,
+            pipe_results: Vec::new(),
+        }
+    }
+
+    pub fn set_error(&mut self, error: String) {
+        self.error = Some(error);
+    }
+
+    pub fn set_message_roundtrip(&mut self, duration: Duration) {
+        self.message_roundtrip_ms = duration.as_secs_f64() * 1000.0;
+    }
+
+    pub fn add_pipe_result(&mut self, result: PipeResult) {
+        self.pipe_results.push(result);
+    }
+
+    pub fn build(self) -> ClientSessionRecord {
+        let total_pipe_bytes: u64 = self
+            .pipe_results
+            .iter()
+            .map(|r| r.size as u64)
+            .sum();
+
+        let overall_pipe_avg_total_ms = if self.pipe_results.is_empty() {
+            0.0
+        } else {
+            self.pipe_results.iter().map(|r| r.total_ms).sum::<f64>()
+                / self.pipe_results.len() as f64
+        };
+
+        let overall_pipe_avg_data_ms = if self.pipe_results.is_empty() {
+            0.0
+        } else {
+            self.pipe_results.iter().map(|r| r.data_only_ms).sum::<f64>()
+                / self.pipe_results.len() as f64
+        };
+
+        ClientSessionRecord {
+            session_id: self.session_id,
+            timestamp: self.timestamp,
+            auth_method: self.auth_method,
+            auth_duration_ms: self.auth_duration_ms,
+            error: self.error,
+            message_roundtrip_ms: self.message_roundtrip_ms,
+            pipe_results: self.pipe_results,
+            total_pipe_bytes,
+            overall_pipe_avg_total_ms,
+            overall_pipe_avg_data_ms,
+        }
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::time::Duration;
+
+    fn tmp_path(name: &str) -> String {
+        let dir = std::env::temp_dir().join("mtp_client_metrics_test");
+        let _ = std::fs::create_dir_all(&dir);
+        dir.join(name).to_str().unwrap().to_string()
+    }
+
+    #[test]
+    fn test_pipe_result_roundtrip() {
+        let pr = PipeResult {
+            size: 1024,
+            iteration: 0,
+            total_ms: 5.5,
+            data_only_ms: 3.2,
+            bytes_matched: true,
+        };
+        let json = serde_json::to_string(&pr).unwrap();
+        let decoded: PipeResult = serde_json::from_str(&json).unwrap();
+        assert_eq!(pr, decoded);
+    }
+
+    #[test]
+    fn test_client_session_roundtrip() {
+        let record = ClientSessionRecord {
+            session_id: "test-session".into(),
+            timestamp: 12345,
+            auth_method: "connect".into(),
+            auth_duration_ms: 42.5,
+            error: None,
+            message_roundtrip_ms: 10.3,
+            pipe_results: vec![
+                PipeResult {
+                    size: 64,
+                    iteration: 0,
+                    total_ms: 1.0,
+                    data_only_ms: 0.5,
+                    bytes_matched: true,
+                },
+                PipeResult {
+                    size: 256,
+                    iteration: 0,
+                    total_ms: 2.0,
+                    data_only_ms: 1.0,
+                    bytes_matched: true,
+                },
+            ],
+            total_pipe_bytes: 320,
+            overall_pipe_avg_total_ms: 1.5,
+            overall_pipe_avg_data_ms: 0.75,
+        };
+
+        let json = serde_json::to_string(&record).unwrap();
+        let decoded: ClientSessionRecord = serde_json::from_str(&json).unwrap();
+        assert_eq!(record, decoded);
+    }
+
+    #[test]
+    fn test_client_metrics_load_missing() {
+        let metrics = ClientMetrics::load("/nonexistent/path.json");
+        assert!(metrics.sessions.is_empty());
+    }
+
+    #[test]
+    fn test_multiple_client_sessions() {
+        let path = tmp_path("multi_session.json");
+        let mut metrics = ClientMetrics::load(&path);
+
+        for i in 0..3 {
+            let mut builder = SessionBuilder::new("connect", Duration::from_millis(10 + i));
+            builder.set_message_roundtrip(Duration::from_millis(5 + i));
+            builder.add_pipe_result(PipeResult {
+                size: 64,
+                iteration: 0,
+                total_ms: 1.0 + i as f64,
+                data_only_ms: 0.5 + i as f64 * 0.5,
+                bytes_matched: true,
+            });
+            metrics.record_session(builder.build());
+        }
+
+        metrics.save(&path);
+
+        let metrics2 = ClientMetrics::load(&path);
+        assert_eq!(metrics2.sessions.len(), 3);
+        assert_eq!(metrics2.sessions[0].auth_method, "connect");
+        assert_eq!(metrics2.sessions[1].pipe_results[0].size, 64);
+
+        let _ = std::fs::remove_file(&path);
+    }
+
+    #[test]
+    fn test_client_overview_stats() {
+        let mut metrics = ClientMetrics::new();
+
+        for i in 0..4 {
+            let mut builder = SessionBuilder::new("connect", Duration::from_millis(20));
+            builder.set_message_roundtrip(Duration::from_millis(10 + i as u64));
+            builder.add_pipe_result(PipeResult {
+                size: 256,
+                iteration: 0,
+                total_ms: 2.0,
+                data_only_ms: 1.0,
+                bytes_matched: true,
+            });
+            metrics.record_session(builder.build());
+        }
+
+        let overview_path = tmp_path("client_overview.json");
+        metrics.build_overview(&overview_path);
+
+        let json = std::fs::read_to_string(&overview_path).unwrap();
+        let overview: ClientOverview = serde_json::from_str(&json).unwrap();
+
+        assert_eq!(overview.total_sessions, 4);
+        assert_eq!(overview.aggregate.avg_auth_duration_ms, 20.0);
+        assert_eq!(overview.aggregate.avg_message_roundtrip_ms, 11.5);
+        assert_eq!(overview.aggregate.avg_pipe_total_ms, 2.0);
+        assert_eq!(overview.aggregate.avg_pipe_data_ms, 1.0);
+        assert_eq!(overview.aggregate.total_pipe_bytes, 1024);
+        assert!(overview.aggregate.avg_pipe_throughput_mbps > 0.0);
+        assert_eq!(overview.sessions.len(), 4);
+
+        let _ = std::fs::remove_file(&overview_path);
+    }
+
+    #[test]
+    fn test_client_overview_empty() {
+        let metrics = ClientMetrics::new();
+        let overview_path = tmp_path("client_empty_overview.json");
+        metrics.build_overview(&overview_path);
+
+        let json = std::fs::read_to_string(&overview_path).unwrap();
+        let overview: ClientOverview = serde_json::from_str(&json).unwrap();
+        assert_eq!(overview.total_sessions, 0);
+        assert!(overview.sessions.is_empty());
+
+        let _ = std::fs::remove_file(&overview_path);
+    }
+
+    #[test]
+    fn test_auth_failure_recording() {
+        let path = tmp_path("auth_failure.json");
+        let overview_path = tmp_path("auth_failure_overview.json");
+
+        let mut metrics = ClientMetrics::load(&path);
+
+        // Successful session
+        let mut b1 = SessionBuilder::new("connect", Duration::from_millis(42));
+        b1.set_message_roundtrip(Duration::from_millis(10));
+        metrics.record_session(b1.build());
+
+        // Failed auth session
+        let mut b2 = SessionBuilder::new("connect", Duration::from_millis(5000));
+        b2.set_error("authentication timed out".into());
+        metrics.record_session(b2.build());
+
+        // Another successful session
+        let mut b3 = SessionBuilder::new("register", Duration::from_millis(100));
+        b3.set_message_roundtrip(Duration::from_millis(8));
+        metrics.record_session(b3.build());
+
+        metrics.save(&path);
+        let metrics2 = ClientMetrics::load(&path);
+        assert_eq!(metrics2.sessions.len(), 3);
+        assert!(metrics2.sessions[0].error.is_none());
+        assert_eq!(
+            metrics2.sessions[1].error.as_deref(),
+            Some("authentication timed out")
+        );
+        assert!(metrics2.sessions[2].error.is_none());
+
+        metrics2.build_overview(&overview_path);
+        let overview_json = std::fs::read_to_string(&overview_path).unwrap();
+        let overview: ClientOverview = serde_json::from_str(&overview_json).unwrap();
+
+        assert_eq!(overview.total_sessions, 3);
+        assert_eq!(overview.aggregate.auth_failures, 1);
+        // Averages should only count successful sessions
+        assert!((overview.aggregate.avg_auth_duration_ms - 71.0).abs() < 0.01); // (42+100)/2
+        assert!((overview.aggregate.avg_message_roundtrip_ms - 9.0).abs() < 0.01); // (10+8)/2
+
+        let _ = std::fs::remove_file(&path);
+        let _ = std::fs::remove_file(&overview_path);
+    }
+
+    // -----------------------------------------------------------------------
+    // Integration-style tests
+    // -----------------------------------------------------------------------
+
+    fn make_pr(size: usize, iteration: usize, total_ms: f64, data_only_ms: f64) -> PipeResult {
+        PipeResult {
+            size,
+            iteration,
+            total_ms,
+            data_only_ms,
+            bytes_matched: true,
+        }
+    }
+
+    #[test]
+    fn test_full_client_lifecycle() {
+        let path = tmp_path("client_lifecycle.json");
+        let overview_path = tmp_path("client_lifecycle_overview.json");
+
+        let mut metrics = ClientMetrics::load(&path);
+
+        let mut b1 = SessionBuilder::new("connect", Duration::from_millis(42));
+        b1.set_message_roundtrip(Duration::from_millis(10));
+        b1.add_pipe_result(make_pr(64, 0, 1.5, 0.8));
+        b1.add_pipe_result(make_pr(256, 0, 2.5, 1.2));
+        metrics.record_session(b1.build());
+
+        let mut b2 = SessionBuilder::new("register", Duration::from_millis(150));
+        b2.set_message_roundtrip(Duration::from_millis(15));
+        b2.add_pipe_result(make_pr(64, 0, 2.0, 1.0));
+        b2.add_pipe_result(make_pr(1024, 0, 5.0, 3.0));
+        metrics.record_session(b2.build());
+
+        metrics.save(&path);
+        let metrics2 = ClientMetrics::load(&path);
+        assert_eq!(metrics2.sessions.len(), 2);
+
+        let s1 = &metrics2.sessions[0];
+        assert_eq!(s1.auth_method, "connect");
+        assert!((s1.auth_duration_ms - 42.0).abs() < 0.01);
+        assert!((s1.message_roundtrip_ms - 10.0).abs() < 0.01);
+        assert_eq!(s1.pipe_results.len(), 2);
+        assert_eq!(s1.total_pipe_bytes, 320);
+        assert!((s1.overall_pipe_avg_total_ms - 2.0).abs() < 0.01);
+        assert!((s1.overall_pipe_avg_data_ms - 1.0).abs() < 0.01);
+
+        let s2 = &metrics2.sessions[1];
+        assert_eq!(s2.auth_method, "register");
+        assert_eq!(s2.pipe_results.len(), 2);
+        assert_eq!(s2.total_pipe_bytes, 1088);
+
+        metrics2.build_overview(&overview_path);
+        let overview_json = std::fs::read_to_string(&overview_path).unwrap();
+        let overview: ClientOverview = serde_json::from_str(&overview_json).unwrap();
+        assert_eq!(overview.total_sessions, 2);
+        assert!((overview.aggregate.avg_auth_duration_ms - 96.0).abs() < 0.01);
+        assert!((overview.aggregate.avg_message_roundtrip_ms - 12.5).abs() < 0.01);
+        assert_eq!(overview.aggregate.total_pipe_bytes, 1408);
+        assert!(overview.aggregate.avg_pipe_throughput_mbps > 0.0);
+
+        let _ = std::fs::remove_file(&path);
+        let _ = std::fs::remove_file(&overview_path);
+    }
+
+    #[test]
+    fn test_cross_session_accumulation() {
+        let path = tmp_path("client_accumulate.json");
+        let overview_path = tmp_path("client_accumulate_overview.json");
+
+        {
+            let mut metrics = ClientMetrics::load(&path);
+            let mut b = SessionBuilder::new("connect", Duration::from_millis(30));
+            b.set_message_roundtrip(Duration::from_millis(8));
+            b.add_pipe_result(make_pr(64, 0, 1.0, 0.5));
+            metrics.record_session(b.build());
+            metrics.save(&path);
+        }
+
+        {
+            let mut metrics = ClientMetrics::load(&path);
+            assert_eq!(metrics.sessions.len(), 1);
+            let mut b = SessionBuilder::new("register", Duration::from_millis(200));
+            b.set_message_roundtrip(Duration::from_millis(12));
+            b.add_pipe_result(make_pr(1024, 0, 4.0, 2.5));
+            metrics.record_session(b.build());
+            metrics.save(&path);
+        }
+
+        let metrics = ClientMetrics::load(&path);
+        assert_eq!(metrics.sessions.len(), 2);
+        assert_eq!(metrics.sessions[0].auth_method, "connect");
+        assert_eq!(metrics.sessions[1].auth_method, "register");
+
+        metrics.build_overview(&overview_path);
+        let overview_json = std::fs::read_to_string(&overview_path).unwrap();
+        let overview: ClientOverview = serde_json::from_str(&overview_json).unwrap();
+        assert_eq!(overview.total_sessions, 2);
+        assert!((overview.aggregate.avg_auth_duration_ms - 115.0).abs() < 0.01);
+        assert!((overview.aggregate.avg_message_roundtrip_ms - 10.0).abs() < 0.01);
+        assert_eq!(overview.aggregate.total_pipe_bytes, 1088);
+
+        let _ = std::fs::remove_file(&path);
+        let _ = std::fs::remove_file(&overview_path);
+    }
+}

example/client/src/pipes.rs

@@ -3,13 +3,16 @@ use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::sync::oneshot;
 use tokio::time::{Duration, Instant};
 
+use crate::metrics::PipeResult;
+
 pub async fn run_pipe_demo(
     conn: &MTPConnection,
     iterations: usize,
-) -> Result<(), Box<dyn std::error::Error>> {
+) -> Result<Vec<PipeResult>, Box<dyn std::error::Error>> {
     let sizes = [64, 256, 1024, 4096];
     let mut all_elapsed = Vec::with_capacity(sizes.len() * iterations);
     let mut all_data_only = Vec::with_capacity(sizes.len() * iterations);
+    let mut pipe_results = Vec::with_capacity(sizes.len() * iterations);
 
     for (i, &size) in sizes.iter().enumerate() {
         let mut size_elapsed = Vec::with_capacity(iterations);
@@ -97,6 +100,14 @@ pub async fn run_pipe_demo(
                 data_only_elapsed.as_secs_f64() * 1000.0,
             );
 
+            pipe_results.push(PipeResult {
+                size,
+                iteration: run,
+                total_ms: overall_elapsed.as_secs_f64() * 1000.0,
+                data_only_ms: data_only_elapsed.as_secs_f64() * 1000.0,
+                bytes_matched: matches,
+            });
+
             size_elapsed.push(overall_elapsed);
             size_data_only.push(data_only_elapsed);
             all_elapsed.push(overall_elapsed);
@@ -123,7 +134,7 @@ pub async fn run_pipe_demo(
         all_elapsed.len()
     );
 
-    Ok(())
+    Ok(pipe_results)
 }
 
 /// Helper: average a slice of Durations without overflowing.