v1.18: client: Timeout resends during send_and_confirm_in_parallel …

…(backport of #358) (#384)

client: Timeout resends during `send_and_confirm_in_parallel` (#358)

* client: Timeout resends during `send_and_confirm_in_parallel`

* Clarify constant

(cherry picked from commit 36c66f5)

Co-authored-by: Jon C <me@jonc.dev>

client/src/send_and_confirm_transactions_in_parallel.rs

@@ -31,7 +31,7 @@ use {
     tokio::{sync::RwLock, task::JoinHandle, time::Instant},
 };
 
-const BLOCKHASH_REFRESH_RATE: Duration = Duration::from_secs(10);
+const BLOCKHASH_REFRESH_RATE: Duration = Duration::from_secs(5);
 const TPU_RESEND_REFRESH_RATE: Duration = Duration::from_secs(2);
 const SEND_INTERVAL: Duration = Duration::from_millis(10);
 type QuicTpuClient = TpuClient<QuicPool, QuicConnectionManager, QuicConfig>;
@@ -326,21 +326,20 @@ async fn confirm_transactions_till_block_height_and_resend_unexpired_transaction
             );
         }
 
+        if let Some(progress_bar) = progress_bar {
+            let progress = progress_from_context_and_block_height(context, max_valid_block_height);
+            progress.set_message_for_confirmed_transactions(
+                progress_bar,
+                "Checking transaction status...",
+            );
+        }
+
         // wait till all transactions are confirmed or we have surpassed max processing age for the last sent transaction
         while !unconfirmed_transaction_map.is_empty()
             && current_block_height.load(Ordering::Relaxed) <= max_valid_block_height
         {
             let block_height = current_block_height.load(Ordering::Relaxed);
 
-            if let Some(progress_bar) = progress_bar {
-                let progress =
-                    progress_from_context_and_block_height(context, max_valid_block_height);
-                progress.set_message_for_confirmed_transactions(
-                    progress_bar,
-                    "Checking transaction status...",
-                );
-            }
-
             if let Some(tpu_client) = tpu_client {
                 let instant = Instant::now();
                 // retry sending transaction only over TPU port
@@ -349,10 +348,29 @@ async fn confirm_transactions_till_block_height_and_resend_unexpired_transaction
                     .iter()
                     .filter(|x| block_height < x.last_valid_block_height)
                     .map(|x| x.serialized_transaction.clone())
-                    .collect();
-                let _ = tpu_client
-                    .try_send_wire_transaction_batch(txs_to_resend_over_tpu)
-                    .await;
+                    .collect::<Vec<_>>();
+                let num_txs_to_resend = txs_to_resend_over_tpu.len();
+                // This is a "reasonable" constant for how long it should
+                // take to fan the transactions out, taken from
+                // `solana_tpu_client::nonblocking::tpu_client::send_wire_transaction_futures`
+                const SEND_TIMEOUT_INTERVAL: Duration = Duration::from_secs(5);
+                let message = if tokio::time::timeout(
+                    SEND_TIMEOUT_INTERVAL,
+                    tpu_client.try_send_wire_transaction_batch(txs_to_resend_over_tpu),
+                )
+                .await
+                .is_err()
+                {
+                    format!("Timed out resending {num_txs_to_resend} transactions...")
+                } else {
+                    format!("Resent {num_txs_to_resend} transactions...")
+                };
+
+                if let Some(progress_bar) = progress_bar {
+                    let progress =
+                        progress_from_context_and_block_height(context, max_valid_block_height);
+                    progress.set_message_for_confirmed_transactions(progress_bar, &message);
+                }
 
                 let elapsed = instant.elapsed();
                 if elapsed < TPU_RESEND_REFRESH_RATE {
@@ -370,14 +388,6 @@ async fn confirm_transactions_till_block_height_and_resend_unexpired_transaction
                 max_valid_block_height = max_valid_block_height_in_remaining_transaction;
             }
         }
-
-        if let Some(progress_bar) = progress_bar {
-            let progress = progress_from_context_and_block_height(context, max_valid_block_height);
-            progress.set_message_for_confirmed_transactions(
-                progress_bar,
-                "Checking transaction status...",
-            );
-        }
     }
 }