Add BlockHeight and ChainId to BlobState. (#2879)

* Add the block_height and the chain_id to the BlobState.
* Remove one expensive `read_certificates` call from `updater.rs`.

linera-core/src/chain_worker/state/attempted_changes.rs

@@ -313,6 +313,8 @@ where
         // Update the blob state with last used certificate hash.
         let blob_state = BlobState {
             last_used_by: certificate_hash,
+            chain_id: block.chain_id,
+            block_height,
             epoch: block.epoch,
         };
         self.state

linera-core/src/updater.rs

@@ -292,14 +292,10 @@ where
                         .await;
                     let local_storage = self.local_node.storage_client();
                     let blob_states = local_storage.read_blob_states(&missing_blob_ids).await?;
-                    let certificates = local_storage
-                        .read_certificates(blob_states.into_iter().map(|x| x.last_used_by))
-                        .await?;
                     let mut chain_heights = BTreeMap::new();
-                    for certificate in certificates {
-                        let block_chain_id = certificate.executed_block().block.chain_id;
-                        let block_height =
-                            certificate.executed_block().block.height.try_add_one()?;
+                    for blob_state in blob_states {
+                        let block_chain_id = blob_state.chain_id;
+                        let block_height = blob_state.block_height.try_add_one()?;
                         chain_heights
                             .entry(block_chain_id)
                             .and_modify(|h| *h = block_height.max(*h))

linera-execution/src/lib.rs

@@ -1174,6 +1174,10 @@ impl From<Vec<u8>> for Response {
 pub struct BlobState {
     /// Hash of the last `Certificate` that published or used this blob.
     pub last_used_by: CryptoHash,
+    /// The `ChainId` of the chain that published the change
+    pub chain_id: ChainId,
+    /// The `BlockHeight` of the chain that published the change
+    pub block_height: BlockHeight,
     /// Epoch of the `last_used_by` certificate.
     pub epoch: Epoch,
 }