Add a subscription for slot entry updates

Cargo.toml

@@ -36,6 +36,7 @@ rand = "0.8"
 serde = "1.0.160"
 serde_derive = "1.0.160"
 serde_json = "1.0.96"
+serde_with = "3.9.0"
 solana-account-decoder = "=1.18.22"
 solana-geyser-plugin-interface = "=1.18.22"
 solana-logger = "=1.18.22"

client/src/geyser_consumer.rs

@@ -19,7 +19,8 @@ use std::{
 use jito_geyser_protos::solana::geyser::{
     geyser_client::GeyserClient, maybe_partial_account_update, EmptyRequest,
     MaybePartialAccountUpdate, SubscribeAccountUpdatesRequest,
-    SubscribePartialAccountUpdatesRequest, SubscribeSlotUpdateRequest, TimestampedAccountUpdate,
+    SubscribePartialAccountUpdatesRequest, SubscribeSlotEntryUpdateRequest,
+    SubscribeSlotUpdateRequest, TimestampedAccountUpdate,
 };
 use log::*;
 use lru::LruCache;
@@ -32,7 +33,9 @@ use tonic::{codegen::InterceptedService, transport::Channel, Response, Status};
 
 use crate::{
     geyser_consumer::GeyserConsumerError::{MissedHeartbeat, StreamClosed},
-    types::{AccountUpdate, AccountUpdateNotification, PartialAccountUpdate, SlotUpdate},
+    types::{
+        AccountUpdate, AccountUpdateNotification, PartialAccountUpdate, SlotEntryUpdate, SlotUpdate,
+    },
     GrpcInterceptor, Pubkey, Slot,
 };
 
@@ -242,6 +245,35 @@ impl GeyserConsumer {
         Ok(())
     }
 
+    pub async fn consume_slot_entry_updates(
+        &self,
+        slot_updates_tx: UnboundedSender<SlotEntryUpdate>,
+    ) -> Result<()> {
+        let mut c = self.client.clone();
+
+        let resp = c
+            .subscribe_slot_entry_updates(SubscribeSlotEntryUpdateRequest {})
+            .await?;
+        let mut stream = resp.into_inner();
+
+        while !self.exit.load(Ordering::Relaxed) {
+            match stream.message().await {
+                Ok(Some(slot_update)) => {
+                    if slot_updates_tx
+                        .send(SlotEntryUpdate::from(slot_update.entry_update.unwrap()))
+                        .is_err()
+                    {
+                        return Err(GeyserConsumerError::ConsumerChannelDisconnected);
+                    };
+                }
+                Ok(None) => return Err(StreamClosed),
+                Err(e) => return Err(GeyserConsumerError::from(e)),
+            }
+        }
+
+        Ok(())
+    }
+
     #[allow(clippy::too_many_arguments)]
     fn process_account_update(
         maybe_message: std::result::Result<Option<TimestampedAccountUpdate>, Status>,

client/src/types.rs

@@ -136,3 +136,17 @@ impl From<geyser::SlotUpdate> for SlotUpdate {
         }
     }
 }
+
+pub struct SlotEntryUpdate {
+    pub slot: Slot,
+    pub index: u64,
+}
+
+impl From<geyser::SlotEntryUpdate> for SlotEntryUpdate {
+    fn from(proto: geyser::SlotEntryUpdate) -> Self {
+        Self {
+            slot: proto.slot,
+            index: proto.index,
+        }
+    }
+}

proto/proto/geyser.proto

@@ -157,6 +157,27 @@ message GetHeartbeatIntervalResponse {
   uint64 heartbeat_interval_ms = 1;
 }
 
+/// Modelled based off of https://github.com/solana-labs/solana/blob/v1.18/geyser-plugin-interface/src/geyser_plugin_interface.rs#L210
+/// If more details are needed can extend this structure.
+message SlotEntryUpdate {
+  // The slot number of the block containing this Entry
+  uint64 slot = 1;
+  // The Entry's index in the block
+  uint64 index = 2;
+  // The number of executed transactions in the Entry
+  // If this number is zero, we can assume its a tick entry
+  uint64 executed_transaction_count = 3;
+}
+
+message TimestampedSlotEntryUpdate {
+  // Time at which the message was generated
+  google.protobuf.Timestamp ts = 1;
+  // SlotEntryUpdate update
+  SlotEntryUpdate entry_update = 2;
+}
+
+message SubscribeSlotEntryUpdateRequest {}
+
 // The following __must__ be assumed:
 //    - Clients may receive data for slots out of order.
 //    - Clients may receive account updates for a given slot out of order.
@@ -186,4 +207,8 @@ service Geyser {
 
   // Subscribes to block updates.
   rpc SubscribeBlockUpdates(SubscribeBlockUpdatesRequest) returns (stream TimestampedBlockUpdate) {}
+
+  // Subscribes to entry updates.
+  // Returns the highest slot seen thus far and the entry index corresponding to the tick
+  rpc SubscribeSlotEntryUpdates(SubscribeSlotEntryUpdateRequest) returns (stream TimestampedSlotEntryUpdate) {}
 }

server/Cargo.toml

@@ -20,6 +20,7 @@ prost-types = { workspace = true }
 serde = { workspace = true }
 serde_derive = { workspace = true }
 serde_json = { workspace = true }
+serde_with = { workspace = true }
 solana-geyser-plugin-interface = { workspace = true }
 solana-logger = { workspace = true }
 solana-metrics = { workspace = true }

server/example-config.json

@@ -3,10 +3,11 @@
   "bind_address": "0.0.0.0:10000",
   "account_update_buffer_size": 100000,
   "slot_update_buffer_size": 100000,
+  "slot_entry_update_buffer_size": 1000000,
   "block_update_buffer_size": 100000,
   "transaction_update_buffer_size": 100000,
   "geyser_service_config": {
     "heartbeat_interval_ms": 1000,
     "subscriber_buffer_size": 1000000
   }
-}
+}