RPC: Provide earliest block information from /status (#1321)

* Provide earliest block information from /status RPC --------- Co-authored-by: Mikhail Zabaluev <mikhail@informal.systems>
informalsystems · Jun 14, 2023 · dba8242 · dba8242
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diff --git a/.changelog/unreleased/breaking-changes/1321-status-earliest-block.md b/.changelog/unreleased/breaking-changes/1321-status-earliest-block.md
@@ -0,0 +1,5 @@
+- [`tendermint-rpc`] Decode the earliest block data fields of the `sync_info`
+  object in `/status` response and expose them in the `SyncInfo` struct:
+  `earliest_block_hash`, `earliest_app_hash`, `earliest_block_height`,
+  `earliest_block_time`
+  ([\#1321](https://github.com/informalsystems/tendermint-rs/pull/1321)).
diff --git a/rpc/src/endpoint/status.rs b/rpc/src/endpoint/status.rs
@@ -41,6 +41,20 @@ impl crate::Response for Response {}
 /// Sync information
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct SyncInfo {
+    /// Earliest block hash
+    #[serde(with = "tendermint::serializers::hash")]
+    pub earliest_block_hash: Hash,
+
+    /// Earliest app hash
+    #[serde(with = "tendermint::serializers::apphash")]
+    pub earliest_app_hash: AppHash,
+
+    /// Earliest block height
+    pub earliest_block_height: block::Height,
+
+    /// Earliest block time
+    pub earliest_block_time: Time,
+
     /// Latest block hash
     #[serde(with = "tendermint::serializers::hash")]
     pub latest_block_hash: Hash,

diff --git a/rpc/tests/kvstore_fixtures/v0_34.rs b/rpc/tests/kvstore_fixtures/v0_34.rs
@@ -710,11 +710,24 @@ fn incoming_fixtures() {
                 );
                 assert_eq!(result.node_info.version.to_string(), "0.34.21");
                 assert!(!result.sync_info.catching_up);
+                assert!(result.sync_info.earliest_app_hash.as_bytes().is_empty());
+                assert!(!result.sync_info.earliest_block_hash.is_empty());
+                assert_eq!(result.sync_info.earliest_block_height.value(), 1);
+                assert!(
+                    result
+                        .sync_info
+                        .earliest_block_time
+                        .duration_since(informal_epoch)
+                        .unwrap()
+                        .as_secs()
+                        > 0
+                );
                 assert_eq!(
                     result.sync_info.latest_app_hash.as_bytes(),
                     [6, 0, 0, 0, 0, 0, 0, 0]
                 );
                 assert!(!result.sync_info.latest_block_hash.is_empty());
+                assert_eq!(result.sync_info.latest_block_height.value(), 67);
                 assert!(
                     result
                         .sync_info

diff --git a/rpc/tests/kvstore_fixtures/v0_37.rs b/rpc/tests/kvstore_fixtures/v0_37.rs
@@ -709,11 +709,24 @@ fn incoming_fixtures() {
                 );
                 assert_eq!(result.node_info.version.to_string(), "0.37.0-alpha.3");
                 assert!(!result.sync_info.catching_up);
+                assert!(result.sync_info.earliest_app_hash.as_bytes().is_empty());
+                assert!(!result.sync_info.earliest_block_hash.is_empty());
+                assert_eq!(result.sync_info.earliest_block_height.value(), 1);
+                assert!(
+                    result
+                        .sync_info
+                        .earliest_block_time
+                        .duration_since(informal_epoch)
+                        .unwrap()
+                        .as_secs()
+                        > 0
+                );
                 assert_eq!(
                     result.sync_info.latest_app_hash.as_bytes(),
                     [6, 0, 0, 0, 0, 0, 0, 0]
                 );
                 assert!(!result.sync_info.latest_block_hash.is_empty());
+                assert_eq!(result.sync_info.latest_block_height.value(), 53);
                 assert!(
                     result
                         .sync_info