Modify the monitor component to only progress games on new L1 block.

op-challenger/fault/monitor.go

@@ -87,11 +87,7 @@ func (m *gameMonitor) minGameTimestamp() uint64 {
 	return 0
 }
 
-func (m *gameMonitor) progressGames(ctx context.Context) error {
-	blockNum, err := m.fetchBlockNumber(ctx)
-	if err != nil {
-		return fmt.Errorf("failed to load current block number: %w", err)
-	}
+func (m *gameMonitor) progressGames(ctx context.Context, blockNum uint64) error {
 	games, err := m.source.FetchAllGamesAtBlock(ctx, m.minGameTimestamp(), new(big.Int).SetUint64(blockNum))
 	if err != nil {
 		return fmt.Errorf("failed to load games: %w", err)
@@ -147,13 +143,26 @@ func (m *gameMonitor) fetchOrCreateGamePlayer(gameData FaultDisputeGame) (gamePl
 func (m *gameMonitor) MonitorGames(ctx context.Context) error {
 	m.logger.Info("Monitoring fault dispute games")
 
+	blockNum := uint64(0)
 	for {
-		err := m.progressGames(ctx)
-		if err != nil {
-			m.logger.Error("Failed to progress games", "err", err)
-		}
-		if err := m.clock.SleepCtx(ctx, 300*time.Millisecond); err != nil {
-			return err
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			nextBlockNum, err := m.fetchBlockNumber(ctx)
+			if err != nil {
+				m.logger.Error("Failed to load current block number", "err", err)
+				continue
+			}
+			if nextBlockNum > blockNum {
+				blockNum = nextBlockNum
+				if err := m.progressGames(ctx, nextBlockNum); err != nil {
+					m.logger.Error("Failed to progress games", "err", err)
+				}
+			}
+			if err := m.clock.SleepCtx(ctx, time.Second); err != nil {
+				return err
+			}
 		}
 	}
 }

op-challenger/fault/monitor_test.go

@@ -65,8 +65,7 @@ func TestMonitorCreateAndProgressGameAgents(t *testing.T) {
 		},
 	}
 
-	err := monitor.progressGames(context.Background())
-	require.NoError(t, err)
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(1)))
 
 	require.Len(t, games.created, 2, "should create game agents")
 	require.Contains(t, games.created, addr1)
@@ -75,7 +74,7 @@ func TestMonitorCreateAndProgressGameAgents(t *testing.T) {
 	require.Equal(t, 1, games.created[addr2].progressCount)
 
 	// The stub will fail the test if a game is created with the same address multiple times
-	require.NoError(t, monitor.progressGames(context.Background()), "should only create games once")
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(2)), "should only create games once")
 	require.Equal(t, 2, games.created[addr1].progressCount)
 	require.Equal(t, 2, games.created[addr2].progressCount)
 }
@@ -96,8 +95,7 @@ func TestMonitorOnlyCreateSpecifiedGame(t *testing.T) {
 		},
 	}
 
-	err := monitor.progressGames(context.Background())
-	require.NoError(t, err)
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(1)))
 
 	require.Len(t, games.created, 1, "should only create allowed game")
 	require.Contains(t, games.created, addr2)
@@ -122,14 +120,14 @@ func TestDeletePlayersWhenNoLongerInListOfGames(t *testing.T) {
 	}
 	source.games = allGames
 
-	require.NoError(t, monitor.progressGames(context.Background()))
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(1)))
 	require.Len(t, games.created, 2)
 	require.Contains(t, games.created, addr1)
 	require.Contains(t, games.created, addr2)
 
 	// First game is now old enough it's not returned in the list of active games
 	source.games = source.games[1:]
-	require.NoError(t, monitor.progressGames(context.Background()))
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(2)))
 	require.Len(t, games.created, 2)
 	require.Contains(t, games.created, addr1)
 	require.Contains(t, games.created, addr2)
@@ -139,7 +137,7 @@ func TestDeletePlayersWhenNoLongerInListOfGames(t *testing.T) {
 
 	// First game now reappears (inexplicably but usefully for our testing)
 	source.games = allGames
-	require.NoError(t, monitor.progressGames(context.Background()))
+	require.NoError(t, monitor.progressGames(context.Background(), uint64(3)))
 	// A new player is created for it because the original was deleted
 	require.Len(t, games.created, 2)
 	require.Contains(t, games.created, addr1)
@@ -165,7 +163,7 @@ func TestCleanupResourcesOfCompletedGames(t *testing.T) {
 		},
 	}
 
-	err := monitor.progressGames(context.Background())
+	err := monitor.progressGames(context.Background(), uint64(1))
 	require.NoError(t, err)
 
 	require.Len(t, games.created, 2, "should create game agents")
@@ -187,8 +185,10 @@ func setupMonitorTest(t *testing.T, allowedGames []common.Address) (*gameMonitor
 		t:       t,
 		created: make(map[common.Address]*stubGame),
 	}
+	i := uint64(1)
 	fetchBlockNum := func(ctx context.Context) (uint64, error) {
-		return 1234, nil
+		i++
+		return i, nil
 	}
 	disk := &stubDiskManager{
 		gameDirExists: make(map[common.Address]bool),