benchmark what sync bytes are

1 files changed, 12 insertions, 0 deletions

diff --git a/src/document/sync.rs b/src/document/sync.rs
index f45a316..29efb5d 100644
--- a/src/document/sync.rs
+++ b/src/document/sync.rs
@@ -27,6 +27,18 @@ impl Received {
     pub(crate) fn carries_changes(&self) -> bool {
         !self.0.changes.is_empty()
     }
+
+    /// The bytes of the changes it carries, and of its bloom filters (`have`).
+    pub(crate) fn sizes(&self) -> (usize, usize) {
+        let changes = self.0.changes.iter().map(<[u8]>::len).sum();
+        let blooms = self
+            .0
+            .have
+            .iter()
+            .map(|have| have.bloom.to_bytes().len())
+            .sum();
+        (changes, blooms)
+    }
 }
 
 /// `payload` decoded. Before taking the document's lock: decoding a large message takes