2 files changed, 28 insertions, 8 deletions
diff --git a/src/swarm/blob.rs b/src/swarm/blob.rs
index 0bd2d37..f06b251 100644
--- a/src/swarm/blob.rs
+++ b/src/swarm/blob.rs
@@ -339,14 +339,20 @@ async fn serve(
         let chunk = &prepared.bytes[start..end];
         // Deflated where it shrinks (`compress`): changes are stored uncompressed.
         let body = match crate::compress::deflate(chunk) {
-            Some(deflated) => BlobBody::DeflatedChunk {
-                index,
-                data: deflated.into(),
-            },
-            None => BlobBody::Chunk {
-                index,
-                data: bytes::Bytes::copy_from_slice(chunk),
-            },
+            Some(deflated) => {
+                state.stats.chunk_served(chunk.len(), deflated.len());
+                BlobBody::DeflatedChunk {
+                    index,
+                    data: deflated.into(),
+                }
+            }
+            None => {
+                state.stats.chunk_served(chunk.len(), chunk.len());
+                BlobBody::Chunk {
+                    index,
+                    data: bytes::Bytes::copy_from_slice(chunk),
+                }
+            }
         };
         reply(state, peer, id, body).await;
     }
diff --git a/src/swarm/stats.rs b/src/swarm/stats.rs
index 6332901..31b6a3b 100644
--- a/src/swarm/stats.rs
+++ b/src/swarm/stats.rs
@@ -137,6 +137,11 @@ pub(crate) struct Relay {
     pub(crate) deflated: u64,
     pub(crate) deflated_from: u64,
     pub(crate) deflated_to: u64,
+    /// Blob chunks served, those of them deflated, and their bytes before and as sent.
+    pub(crate) chunks_served: u64,
+    pub(crate) chunks_deflated: u64,
+    pub(crate) chunk_bytes: u64,
+    pub(crate) chunk_bytes_sent: u64,
     /// Sync messages received that carried changes, all of which we had already, and
     /// their payload's bytes: changes that came twice. Of those, how many came along a
     /// writer's tree (`SyncEnvelope::writer`), and how many were taken as delivered by
@@ -258,6 +263,15 @@ impl NodeStats {
         self.lock().relay.tree_forwards += 1;
     }
 
+    /// A blob chunk of `bytes` was served as `sent` bytes (fewer if deflated).
+    pub(crate) fn chunk_served(&self, bytes: usize, sent: usize) {
+        let mut inner = self.lock();
+        inner.relay.chunks_served += 1;
+        inner.relay.chunks_deflated += u64::from(sent < bytes);
+        inner.relay.chunk_bytes += bytes as u64;
+        inner.relay.chunk_bytes_sent += sent as u64;
+    }
+
     /// A sync message of `from` bytes went out deflated to `to`.
     pub(crate) fn deflated(&self, from: usize, to: usize) {
         let mut inner = self.lock();