skip liquidation task loop if last committed block height is the same (backport #2124)

protocol/daemons/liquidation/client/grpc_helper_test.go

@@ -556,7 +556,11 @@ func TestSendLiquidatableSubaccountIds(t *testing.T) {
 				tc.negativeTncSubaccountIds,
 				tc.subaccountOpenPositionInfo,
 			)
-			require.Equal(t, tc.expectedError, err)
+			if tc.expectedError != nil {
+				require.ErrorContains(t, err, tc.expectedError.Error())
+			} else {
+				require.NoError(t, err)
+			}
 		})
 	}
 }

protocol/daemons/liquidation/client/sub_task_runner.go

@@ -26,7 +26,9 @@ type SubTaskRunner interface {
 	) error
 }
 
-type SubTaskRunnerImpl struct{}
+type SubTaskRunnerImpl struct {
+	lastLoopBlockHeight uint32
+}
 
 // Ensure SubTaskRunnerImpl implements the SubTaskRunner interface.
 var _ SubTaskRunner = (*SubTaskRunnerImpl)(nil)
@@ -50,6 +52,19 @@ func (s *SubTaskRunnerImpl) RunLiquidationDaemonTaskLoop(
 		return err
 	}
 
+	// Skip the loop if no new block has been committed.
+	// Note that lastLoopBlockHeight is initialized to 0, so the first loop will always run.
+	if lastCommittedBlockHeight == s.lastLoopBlockHeight {
+		daemonClient.logger.Info(
+			"Skipping liquidation daemon task loop as no new block has been committed",
+			"blockHeight", lastCommittedBlockHeight,
+		)
+		return nil
+	}
+
+	// Update the last loop block height.
+	s.lastLoopBlockHeight = lastCommittedBlockHeight
+
 	// 1. Fetch all information needed to calculate total net collateral and margin requirements.
 	subaccounts,
 		perpInfos,