From d41dec9395826182b29ba9f11dd484e2cd331bc3 Mon Sep 17 00:00:00 2001
From: Tyera Eulberg <tyera@solana.com>
Date: Mon, 11 Feb 2019 14:51:14 -0700
Subject: [PATCH] Make EntryStreamStage optional

---
 src/entry_stream_stage.rs | 20 ++++++++------------
 src/tvu.rs                | 28 ++++++++++++++++++----------
 2 files changed, 26 insertions(+), 22 deletions(-)

diff --git a/src/entry_stream_stage.rs b/src/entry_stream_stage.rs
index 943441436f..3a31a1a0a3 100644
--- a/src/entry_stream_stage.rs
+++ b/src/entry_stream_stage.rs
@@ -25,14 +25,12 @@ impl EntryStreamStage {
     #[allow(clippy::new_ret_no_self)]
     pub fn new(
         ledger_entry_receiver: EntryReceiver,
-        entry_stream: Option<&String>,
+        entry_stream_socket: String,
         leader_scheduler: Arc<RwLock<LeaderScheduler>>,
         exit: Arc<AtomicBool>,
     ) -> (Self, EntryReceiver) {
         let (entry_stream_sender, entry_stream_receiver) = channel();
-        let mut entry_stream = entry_stream
-            .cloned()
-            .map(|socket| EntryStream::new(socket, leader_scheduler));
+        let mut entry_stream = EntryStream::new(entry_stream_socket, leader_scheduler);
         let t_entry_stream = Builder::new()
             .name("solana-entry-stream".to_string())
             .spawn(move || loop {
@@ -42,7 +40,7 @@ impl EntryStreamStage {
                 if let Err(e) = Self::process_entries(
                     &ledger_entry_receiver,
                     &entry_stream_sender,
-                    entry_stream.as_mut(),
+                    &mut entry_stream,
                 ) {
                     match e {
                         Error::RecvTimeoutError(RecvTimeoutError::Disconnected) => break,
@@ -57,15 +55,13 @@ impl EntryStreamStage {
     fn process_entries(
         ledger_entry_receiver: &EntryReceiver,
         entry_stream_sender: &EntrySender,
-        entry_stream: Option<&mut EntryStream>,
+        entry_stream: &mut EntryStream,
     ) -> Result<()> {
         let timeout = Duration::new(1, 0);
         let entries = ledger_entry_receiver.recv_timeout(timeout)?;
-        if let Some(stream) = entry_stream {
-            stream.stream_entries(&entries).unwrap_or_else(|e| {
-                error!("Entry Stream error: {:?}, {:?}", e, stream.socket);
-            });
-        }
+        entry_stream.stream_entries(&entries).unwrap_or_else(|e| {
+            error!("Entry Stream error: {:?}, {:?}", e, entry_stream.socket);
+        });
         entry_stream_sender.send(entries)?;
         Ok(())
     }
@@ -117,7 +113,7 @@ mod test {
         EntryStreamStage::process_entries(
             &ledger_entry_receiver,
             &entry_stream_sender,
-            Some(&mut entry_stream),
+            &mut entry_stream,
         )
         .unwrap();
         assert_eq!(entry_stream.socket.len(), 5);
diff --git a/src/tvu.rs b/src/tvu.rs
index 8ea92ee42c..045ee4689d 100644
--- a/src/tvu.rs
+++ b/src/tvu.rs
@@ -40,7 +40,7 @@ pub struct Tvu {
     fetch_stage: BlobFetchStage,
     retransmit_stage: RetransmitStage,
     replay_stage: ReplayStage,
-    entry_stream_stage: EntryStreamStage,
+    entry_stream_stage: Option<EntryStreamStage>,
     storage_stage: StorageStage,
     exit: Arc<AtomicBool>,
     last_entry_id: Arc<RwLock<Hash>>,
@@ -118,7 +118,7 @@ impl Tvu {
 
         let l_last_entry_id = Arc::new(RwLock::new(last_entry_id));
 
-        let (replay_stage, ledger_entry_receiver) = ReplayStage::new(
+        let (replay_stage, mut previous_receiver) = ReplayStage::new(
             keypair.pubkey(),
             voting_keypair,
             blocktree.clone(),
@@ -132,16 +132,22 @@ impl Tvu {
             ledger_signal_receiver,
         );
 
-        let (entry_stream_stage, entry_stream_receiver) = EntryStreamStage::new(
-            ledger_entry_receiver,
-            entry_stream,
-            bank.leader_scheduler.clone(),
-            exit.clone(),
-        );
+        let entry_stream_stage = if entry_stream.is_some() {
+            let (entry_stream_stage, entry_stream_receiver) = EntryStreamStage::new(
+                previous_receiver,
+                entry_stream.unwrap().to_string(),
+                bank.leader_scheduler.clone(),
+                exit.clone(),
+            );
+            previous_receiver = entry_stream_receiver;
+            Some(entry_stream_stage)
+        } else {
+            None
+        };
 
         let storage_stage = StorageStage::new(
             storage_state,
-            entry_stream_receiver,
+            previous_receiver,
             Some(blocktree),
             &keypair,
             &exit.clone(),
@@ -197,7 +203,9 @@ impl Service for Tvu {
         self.retransmit_stage.join()?;
         self.fetch_stage.join()?;
         self.storage_stage.join()?;
-        self.entry_stream_stage.join()?;
+        if self.entry_stream_stage.is_some() {
+            self.entry_stream_stage.unwrap().join()?;
+        }
         self.replay_stage.join()?;
         Ok(())
     }