add chunked download and use it during rejoin

1 files changed, 10 insertions, 0 deletions

diff --git a/src/remake/mod.rs b/src/remake/mod.rs
index 0895931..1c2be36 100644
--- a/src/remake/mod.rs
+++ b/src/remake/mod.rs
@@ -68,6 +68,16 @@ pub(crate) trait Host: Clone + Send + Sync + 'static {
     /// alive recently enough, read from `doc`.
     fn electorate(&self, doc: &AutoCommit, now_ms: u64) -> Vec<String>;
 
+    /// Downloads a change from peers on the local epoch, in chunks from several at once,
+    /// checked against its hash.
+    fn fetch_change(
+        &self,
+        hash: automerge::ChangeHash,
+    ) -> impl Future<Output = anyhow::Result<automerge::Change>> + Send;
+
+    /// Starts sync with every peer (e.g. after holding it back).
+    fn request_sync(&self);
+
     fn is_node_ready(&self) -> impl Future<Output = bool> + Send;
 
     /// Known (not forgotten) peers.