op-challenger: Remove unused blockNumberFetcher (#11006)

op-challenger/game/monitor.go

@@ -19,8 +19,6 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 )
 
-type blockNumberFetcher func(ctx context.Context) (uint64, error)
-
 // gameSource loads information about the games available to play
 type gameSource interface {
 	GetGamesAtOrAfter(ctx context.Context, blockHash common.Hash, earliestTimestamp uint64) ([]types.GameMetadata, error)
@@ -51,7 +49,6 @@ type gameMonitor struct {
 	preimages    preimageScheduler
 	gameWindow   time.Duration
 	claimer      claimer
-	fetchBlockNumber blockNumberFetcher
 	allowedGames []common.Address
 	l1HeadsSub   ethereum.Subscription
 	l1Source     *headSource
@@ -78,7 +75,6 @@ func newGameMonitor(
 	preimages preimageScheduler,
 	gameWindow time.Duration,
 	claimer claimer,
-	fetchBlockNumber blockNumberFetcher,
 	allowedGames []common.Address,
 	l1Source MinimalSubscriber,
 ) *gameMonitor {
@@ -90,7 +86,6 @@ func newGameMonitor(
 		source:       source,
 		gameWindow:   gameWindow,
 		claimer:      claimer,
-		fetchBlockNumber: fetchBlockNumber,
 		allowedGames: allowedGames,
 		l1Source:     &headSource{inner: l1Source},
 	}

op-challenger/game/monitor_test.go

@@ -155,11 +155,6 @@ func setupMonitorTest(
 ) (*gameMonitor, *stubGameSource, *stubScheduler, *mockNewHeadSource, *stubPreimageScheduler, *mockScheduler) {
 	logger := testlog.Logger(t, log.LevelDebug)
 	source := &stubGameSource{}
-	i := uint64(1)
-	fetchBlockNum := func(ctx context.Context) (uint64, error) {
-		i++
-		return i, nil
-	}
 	sched := &stubScheduler{}
 	preimages := &stubPreimageScheduler{}
 	mockHeadSource := &mockNewHeadSource{}
@@ -172,7 +167,6 @@ func setupMonitorTest(
 		preimages,
 		time.Duration(0),
 		stubClaimer,
-		fetchBlockNum,
 		allowedGames,
 		mockHeadSource,
 	)

op-challenger/game/service.go

@@ -251,7 +251,7 @@ func (s *Service) initLargePreimages() error {
 }
 
 func (s *Service) initMonitor(cfg *config.Config) {
-	s.monitor = newGameMonitor(s.logger, s.l1Clock, s.factoryContract, s.sched, s.preimages, cfg.GameWindow, s.claimer, s.l1Client.BlockNumber, cfg.GameAllowlist, s.pollClient)
+	s.monitor = newGameMonitor(s.logger, s.l1Clock, s.factoryContract, s.sched, s.preimages, cfg.GameWindow, s.claimer, cfg.GameAllowlist, s.pollClient)
 }
 
 func (s *Service) Start(ctx context.Context) error {