1 files changed, 72 insertions, 5 deletions

diff --git a/src/transport/identity.rs b/src/transport/identity.rs
index af0fe74..17c7795 100644
--- a/src/transport/identity.rs
+++ b/src/transport/identity.rs
@@ -38,9 +38,11 @@ use tracing::{debug, info};
 
 use crate::identity::{self, NodeKey};
 use crate::locks::MutexExt;
+use crate::transport::stats::{IdentityCounts, IdentityStats, TransportStats};
 use crate::transport::traffic::Traffic;
 use crate::transport::{
-    EncodedMessage, HandlerFn, IdentityProof, MessageHandler, MessageKind, ParsedMessage, Transport,
+    Destination, EncodedMessage, HandlerFn, IdentityProof, MessageHandler, MessageKind,
+    ParsedMessage, Transport,
 };
 
 pub(crate) const WHO_LABEL: &[u8] = b"continuum/who/1";
@@ -132,6 +134,8 @@ struct Book {
     asked: HashMap<String, Instant>,
     /// Seeds being resolved: who waits for a ME from where.
     waiting: HashMap<String, Vec<oneshot::Sender<String>>>,
+    /// Since start (`stats`).
+    counts: IdentityCounts,
 }
 
 /// The scheme of `address`.
@@ -151,6 +155,7 @@ impl Book {
             if *slot != address {
                 let previous = std::mem::replace(slot, address.to_owned());
                 self.at.remove(&previous);
+                self.counts.address_changes += 1;
             }
         } else {
             addresses.push(address.to_owned());
@@ -185,6 +190,25 @@ impl Book {
         }
     }
 
+    /// What the books hold now, and the counts.
+    fn stats(&self) -> IdentityStats {
+        let mut proven = std::collections::BTreeMap::new();
+        for addresses in self.proven.values() {
+            for address in addresses {
+                *proven.entry(scheme_of(address).to_owned()).or_insert(0) += 1;
+            }
+        }
+        IdentityStats {
+            proven,
+            hinted: self
+                .hints
+                .keys()
+                .filter(|node| !self.proven.contains_key(*node))
+                .count(),
+            counts: self.counts,
+        }
+    }
+
     /// Whether to ask `address` WHO now (always, if `force`), noting that it was asked.
     fn ask(&mut self, address: &str, now: Instant, force: bool) -> bool {
         if !force
@@ -294,6 +318,7 @@ impl Shared {
     ) -> Option<String> {
         let message = signed(label, address, &link.own_address());
         if !identity::verify(&proof.key, &message, &proof.signature) {
+            self.lock().counts.proofs_rejected += 1;
             debug!(from = %address, "Ignoring an identity proof that doesn't hold");
             return None;
         }
@@ -379,6 +404,7 @@ impl Shared {
                 match node {
                     Some(node) => handler(node, message, payload_len).await,
                     None => {
+                        self.lock().counts.dropped_unproven += 1;
                         debug!(
                             from = %address,
                             kind = ?message.kind(),
@@ -512,6 +538,38 @@ impl Transport for IdentityTransport {
             .collect()
     }
 
+    /// The address `encode` picks, and the transport's connection there.
+    fn destination(&self, peer: &str) -> Option<Destination> {
+        let address = self.shared.destination(peer)?;
+        let proven = self
+            .shared
+            .lock()
+            .proven
+            .get(peer)
+            .is_some_and(|addresses| addresses.contains(&address));
+        let connection = self
+            .shared
+            .split(&address)
+            .and_then(|(link, target)| link.inner.connection(&target));
+        Some(Destination {
+            address,
+            proven,
+            connection,
+        })
+    }
+
+    /// The identity layer's, and each transport's.
+    fn stats(&self) -> TransportStats {
+        let mut stats = TransportStats {
+            identity: Some(self.shared.lock().stats()),
+            ..TransportStats::default()
+        };
+        for link in &self.shared.links {
+            stats.merge(link.inner.stats());
+        }
+        stats
+    }
+
     /// Each transport's, with its scheme.
     fn discovered_seeds(&self) -> Vec<String> {
         self.shared
@@ -594,9 +652,12 @@ impl Transport for IdentityTransport {
                 info!(seed = %seed, node = %node, "Seed is node");
                 Ok(node)
             }
-            _ => Err(anyhow!(
-                "no node answered at {address} within {RESOLVE_TIMEOUT:?}"
-            )),
+            _ => {
+                self.shared.lock().counts.seeds_unanswered += 1;
+                Err(anyhow!(
+                    "no node answered at {address} within {RESOLVE_TIMEOUT:?}"
+                ))
+            }
         }
     }
 
@@ -617,7 +678,7 @@ impl Transport for IdentityTransport {
 
     async fn send_encoded(&self, message: &EncodedMessage) -> Result<()> {
         let hints = {
-            let book = self.shared.lock();
+            let mut book = self.shared.lock();
             let proven = book
                 .proven
                 .get(&message.peer)
@@ -625,6 +686,7 @@ impl Transport for IdentityTransport {
             if proven {
                 None
             } else {
+                book.counts.refused_unproven += 1;
                 Some(book.hints.get(&message.peer).cloned().unwrap_or_default())
             }
         };
@@ -721,6 +783,11 @@ mod tests {
         assert!(book.bind("s:y", "n2", now));
         assert_eq!(book.proven["n1"], ["t:x"]);
         assert_eq!(book.at["s:y"].0, "n2");
+        // Only n1's move from s:x to s:y changed an address.
+        assert_eq!(book.counts.address_changes, 1);
+        let stats = book.stats();
+        assert_eq!(stats.proven["s"], 1);
+        assert_eq!(stats.proven["t"], 1);
     }
 
     #[test]