From fa5033322237a0e8b83fef23e29c030ef2b58586 Mon Sep 17 00:00:00 2001
From: Christos Hadjiaslanis <chrishadjiaslanis@gmail.com>
Date: Tue, 1 Oct 2024 12:01:48 +0100
Subject: [PATCH] Don't send chain updates for optimistic clients.

---
 linera-core/src/client/mod.rs |  3 ++-
 linera-core/src/updater.rs    | 11 +++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/linera-core/src/client/mod.rs b/linera-core/src/client/mod.rs
index c25b21890efa..54b5bb734213 100644
--- a/linera-core/src/client/mod.rs
+++ b/linera-core/src/client/mod.rs
@@ -1030,7 +1030,8 @@ where
                     local_node: local_node.clone(),
                 };
                 let action = action.clone();
-                Box::pin(async move { updater.send_chain_update(action).await })
+                let is_optimistic = self.is_optimistic();
+                Box::pin(async move { updater.send_chain_update(action, is_optimistic).await })
             },
         )
         .await?;
diff --git a/linera-core/src/updater.rs b/linera-core/src/updater.rs
index ae3da99f3426..ea76f9d65c67 100644
--- a/linera-core/src/updater.rs
+++ b/linera-core/src/updater.rs
@@ -377,6 +377,7 @@ where
     pub async fn send_chain_update(
         &mut self,
         action: CommunicateAction,
+        optimistic_client: bool,
     ) -> Result<LiteVote, NodeError> {
         let (target_block_height, chain_id) = match &action {
             CommunicateAction::SubmitBlock { proposal, .. } => {
@@ -391,10 +392,12 @@ where
                 height, chain_id, ..
             } => (*height, *chain_id),
         };
-        // Update the validator with missing information, if needed.
-        let delivery = CrossChainMessageDelivery::NonBlocking;
-        self.send_chain_information(chain_id, target_block_height, delivery)
-            .await?;
+        if !optimistic_client {
+            // Update the validator with missing information, if needed.
+            let delivery = CrossChainMessageDelivery::NonBlocking;
+            self.send_chain_information(chain_id, target_block_height, delivery)
+                .await?;
+        }
         // Send the block proposal, certificate or timeout request and return a vote.
         let vote = match action {
             CommunicateAction::SubmitBlock { proposal, blob_ids } => {