From c7226385f3765b2a72b7b4d95129fb20fec58d5c Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 5 Nov 2026 04:36:58 +0100
Subject: push changes experiment

---
 src/transport/mod.rs     | 9 +++++++++
 src/transport/traffic.rs | 4 +++-
 src/transport/wire.rs    | 2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

(limited to 'src/transport')

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index 474e386..7e5d41b 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -743,6 +743,15 @@ pub(crate) enum SyncBody {
     Message(#[serde(with = "crate::transport::wire::codec::sync_message")] SyncPayload),
     /// An Automerge sync message, deflated (`compress`): a large one, which shrank.
     Deflated(#[serde(with = "crate::transport::wire::codec::sync_message")] SyncPayload),
+    /// Changes passed on along a writer's tree as they are, with the sender's heads,
+    /// instead of an Automerge sync message (`AppState::push_changes`): where the sender
+    /// takes the message as delivered, it has everything the receiver has, and needs
+    /// none of the rest of one (`SyncSession::push`).
+    Changes {
+        #[serde(with = "crate::transport::wire::codec::change_hashes")]
+        heads: Vec<ChangeHash>,
+        changes: Vec<serde_bytes::ByteBuf>,
+    },
     /// Instead of a message too large to send in one piece: fetch these changes as a
     /// blob (`BlobId::Delta`), then sync on.
     Delta(DeltaSpec),
diff --git a/src/transport/traffic.rs b/src/transport/traffic.rs
index df95bce..11aa70d 100644
--- a/src/transport/traffic.rs
+++ b/src/transport/traffic.rs
@@ -198,7 +198,9 @@ fn related(peer: &str, message: &ParsedMessage) -> Option<String> {
             SyncBody::Delta(spec) => {
                 format!("blob {}", crate::transport::BlobId::Delta(spec.id()))
             }
-            SyncBody::Message(_) | SyncBody::Deflated(_) => return None,
+            SyncBody::Message(_) | SyncBody::Deflated(_) | SyncBody::Changes { .. } => {
+                return None;
+            }
         },
         _ => return None,
     })
diff --git a/src/transport/wire.rs b/src/transport/wire.rs
index 2794e69..70ac3ce 100644
--- a/src/transport/wire.rs
+++ b/src/transport/wire.rs
@@ -14,7 +14,7 @@ use super::{EncodedMessage, MessageKind, ParsedMessage};
 
 /// The wire format's version, the first byte of every payload. Bump it with every change
 /// to a message type or a codec (`golden_bytes` fails then).
-pub(crate) const VERSION: u8 = 32;
+pub(crate) const VERSION: u8 = 33;
 
 /// What the second byte of a payload says.
 fn tag(kind: MessageKind) -> u8 {
-- 
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