op-challenger: Introduce game type registry so we only create games for supported game types.

# Conflicts:
#	op-challenger/game/scheduler/scheduler_test.go
#	op-challenger/game/service.go

op-challenger/game/fault/register.go

+package fault
+
+import (
+	"context"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/config"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
+	"github.com/ethereum-optimism/optimism/op-challenger/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/txmgr"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+var (
+	cannonGameType   = uint8(0)
+	alphabetGameType = uint8(255)
+)
+
+type Registry interface {
+	RegisterGameType(gameType uint8, creator scheduler.PlayerCreator)
+}
+
+func RegisterGameTypes(
+	registry Registry,
+	ctx context.Context,
+	logger log.Logger,
+	m metrics.Metricer,
+	cfg *config.Config,
+	txMgr txmgr.TxManager,
+	client bind.ContractCaller) {
+	creator := func(game types.GameMetadata, dir string) (scheduler.GamePlayer, error) {
+		return NewGamePlayer(ctx, logger, m, cfg, dir, game.Proxy, txMgr, client)
+	}
+	switch cfg.TraceType {
+	case config.TraceTypeCannon:
+		registry.RegisterGameType(cannonGameType, creator)
+	case config.TraceTypeOutputCannon:
+		registry.RegisterGameType(cannonGameType, creator)
+	case config.TraceTypeAlphabet:
+		registry.RegisterGameType(alphabetGameType, creator)
+	}
+}

op-challenger/game/registry/registry.go

+package registry
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
+)
+
+var (
+	ErrUnsupportedGameType = errors.New("unsupported game type")
+)
+
+type GameTypeRegistry struct {
+	types map[uint8]scheduler.PlayerCreator
+}
+
+func NewGameTypeRegistry() *GameTypeRegistry {
+	return &GameTypeRegistry{
+		types: make(map[uint8]scheduler.PlayerCreator),
+	}
+}
+
+func (r *GameTypeRegistry) RegisterGameType(gameType uint8, creator scheduler.PlayerCreator) {
+	if _, ok := r.types[gameType]; ok {
+		panic(fmt.Errorf("duplicate creator registered for game type: %v", gameType))
+	}
+	r.types[gameType] = creator
+}
+
+func (r *GameTypeRegistry) CreatePlayer(game types.GameMetadata, dir string) (scheduler.GamePlayer, error) {
+	creator, ok := r.types[game.GameType]
+	if !ok {
+		return nil, fmt.Errorf("%w: %v", ErrUnsupportedGameType, game.GameType)
+	}
+	return creator(game, dir)
+}

op-challenger/game/registry/registry_test.go

+package registry
+
+import (
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler/test"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUnknownGameType(t *testing.T) {
+	registry := NewGameTypeRegistry()
+	player, err := registry.CreatePlayer(types.GameMetadata{GameType: 0}, "")
+	require.ErrorIs(t, err, ErrUnsupportedGameType)
+	require.Nil(t, player)
+}
+
+func TestKnownGameType(t *testing.T) {
+	registry := NewGameTypeRegistry()
+	expectedPlayer := &test.StubGamePlayer{}
+	creator := func(game types.GameMetadata, dir string) (scheduler.GamePlayer, error) {
+		return expectedPlayer, nil
+	}
+	registry.RegisterGameType(0, creator)
+	player, err := registry.CreatePlayer(types.GameMetadata{GameType: 0}, "")
+	require.NoError(t, err)
+	require.Same(t, expectedPlayer, player)
+}
+
+func TestPanicsOnDuplicateGameType(t *testing.T) {
+	registry := NewGameTypeRegistry()
+	creator := func(game types.GameMetadata, dir string) (scheduler.GamePlayer, error) {
+		return nil, nil
+	}
+	registry.RegisterGameType(0, creator)
+	require.Panics(t, func() {
+		registry.RegisterGameType(0, creator)
+	})
+}

op-challenger/game/scheduler/coordinator_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler/test"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-challenger/metrics"
 	"github.com/ethereum-optimism/optimism/op-service/testlog"
@@ -30,7 +31,7 @@ func TestScheduleNewGames(t *testing.T) {
 		players = append(players, j.player)
 	}
 	for addr, player := range games.created {
-		require.Equal(t, disk.DirForGame(addr), player.dir, "should use allocated directory")
+		require.Equal(t, disk.DirForGame(addr), player.Dir, "should use allocated directory")
 		require.Containsf(t, players, player, "should have created a job for player %v", addr)
 	}
 }
@@ -233,34 +234,18 @@ func setupCoordinatorTest(t *testing.T, bufferSize int) (*coordinator, <-chan jo
 	resultQueue := make(chan job, bufferSize)
 	games := &createdGames{
 		t:       t,
-		created: make(map[common.Address]*stubGame),
+		created: make(map[common.Address]*test.StubGamePlayer),
 	}
 	disk := &stubDiskManager{gameDirExists: make(map[common.Address]bool)}
 	c := newCoordinator(logger, metrics.NoopMetrics, workQueue, resultQueue, games.CreateGame, disk)
 	return c, workQueue, resultQueue, games, disk
 }
 
-type stubGame struct {
-	addr          common.Address
-	progressCount int
-	status        types.GameStatus
-	dir           string
-}
-
-func (g *stubGame) ProgressGame(_ context.Context) types.GameStatus {
-	g.progressCount++
-	return g.status
-}
-
-func (g *stubGame) Status() types.GameStatus {
-	return g.status
-}
-
 type createdGames struct {
 	t               *testing.T
 	createCompleted common.Address
 	creationFails   common.Address
-	created         map[common.Address]*stubGame
+	created         map[common.Address]*test.StubGamePlayer
 }
 
 func (c *createdGames) CreateGame(fdg types.GameMetadata, dir string) (GamePlayer, error) {
@@ -275,10 +260,10 @@ func (c *createdGames) CreateGame(fdg types.GameMetadata, dir string) (GamePlaye
 	if addr == c.createCompleted {
 		status = types.GameStatusDefenderWon
 	}
-	game := &stubGame{
-		addr:   addr,
-		status: status,
-		dir:    dir,
+	game := &test.StubGamePlayer{
+		Addr:        addr,
+		StatusValue: status,
+		Dir:         dir,
 	}
 	c.created[addr] = game
 	return game, nil

op-challenger/game/scheduler/scheduler_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"testing"
 
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler/test"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-challenger/metrics"
 	"github.com/ethereum-optimism/optimism/op-service/testlog"
@@ -16,7 +17,7 @@ func TestSchedulerProcessesGames(t *testing.T) {
 	logger := testlog.Logger(t, log.LvlInfo)
 	ctx := context.Background()
 	createPlayer := func(g types.GameMetadata, dir string) (GamePlayer, error) {
-		return &stubPlayer{}, nil
+		return &test.StubGamePlayer{}, nil
 	}
 	removeExceptCalls := make(chan []common.Address)
 	disk := &trackingDiskManager{removeExceptCalls: removeExceptCalls}
@@ -44,7 +45,7 @@ func TestSchedulerProcessesGames(t *testing.T) {
 func TestReturnBusyWhenScheduleQueueFull(t *testing.T) {
 	logger := testlog.Logger(t, log.LvlInfo)
 	createPlayer := func(game types.GameMetadata, dir string) (GamePlayer, error) {
-		return &stubPlayer{}, nil
+		return &test.StubGamePlayer{}, nil
 	}
 	removeExceptCalls := make(chan []common.Address)
 	disk := &trackingDiskManager{removeExceptCalls: removeExceptCalls}

op-challenger/game/scheduler/test/stub_player.go

+package test
+
+import (
+	"context"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
+	"github.com/ethereum/go-ethereum/common"
+)
+
+type StubGamePlayer struct {
+	Addr          common.Address
+	ProgressCount int
+	StatusValue   types.GameStatus
+	Dir           string
+}
+
+func (g *StubGamePlayer) ProgressGame(_ context.Context) types.GameStatus {
+	g.ProgressCount++
+	return g.StatusValue
+}
+
+func (g *StubGamePlayer) Status() types.GameStatus {
+	return g.StatusValue
+}

op-challenger/game/scheduler/worker_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler/test"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-e2e/e2eutils/wait"
 
@@ -24,7 +25,7 @@ func TestWorkerShouldProcessJobsUntilContextDone(t *testing.T) {
 	go progressGames(ctx, in, out, &wg, ms.ThreadActive, ms.ThreadIdle)
 
 	in <- job{
-		player: &stubPlayer{status: types.GameStatusInProgress},
+		player: &test.StubGamePlayer{StatusValue: types.GameStatusInProgress},
 	}
 	waitErr := wait.For(context.Background(), 100*time.Millisecond, func() (bool, error) {
 		return ms.activeCalls >= 1, nil
@@ -34,7 +35,7 @@ func TestWorkerShouldProcessJobsUntilContextDone(t *testing.T) {
 	require.Equal(t, ms.idleCalls, 1)
 
 	in <- job{
-		player: &stubPlayer{status: types.GameStatusDefenderWon},
+		player: &test.StubGamePlayer{StatusValue: types.GameStatusDefenderWon},
 	}
 	waitErr = wait.For(context.Background(), 100*time.Millisecond, func() (bool, error) {
 		return ms.activeCalls >= 2, nil
@@ -67,18 +68,6 @@ func (m *metricSink) ThreadIdle() {
 	m.idleCalls++
 }
 
-type stubPlayer struct {
-	status types.GameStatus
-}
-
-func (s *stubPlayer) ProgressGame(ctx context.Context) types.GameStatus {
-	return s.status
-}
-
-func (s *stubPlayer) Status() types.GameStatus {
-	return s.status
-}
-
 func readWithTimeout[T any](t *testing.T, ch <-chan T) T {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()

op-challenger/game/service.go

@@ -9,8 +9,8 @@ import (
 	"github.com/ethereum-optimism/optimism/op-challenger/config"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/loader"
+	registry2 "github.com/ethereum-optimism/optimism/op-challenger/game/registry"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/scheduler"
-	"github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-challenger/metrics"
 	"github.com/ethereum-optimism/optimism/op-challenger/version"
 	opClient "github.com/ethereum-optimism/optimism/op-service/client"
@@ -94,15 +94,16 @@ func NewService(ctx context.Context, logger log.Logger, cfg *config.Config) (*Se
 	}
 	loader := loader.NewGameLoader(factoryContract)
 
+	registry := registry2.NewGameTypeRegistry()
+	fault.RegisterGameTypes(registry, ctx, logger, m, cfg, txMgr, l1Client)
+
 	disk := newDiskManager(cfg.Datadir)
 	s.sched = scheduler.NewScheduler(
 		logger,
 		m,
 		disk,
 		cfg.MaxConcurrency,
-		func(game types.GameMetadata, dir string) (scheduler.GamePlayer, error) {
-			return fault.NewGamePlayer(ctx, logger, m, cfg, dir, game.Proxy, txMgr, l1Client)
-		})
+		registry.CreatePlayer)
 
 	pollClient, err := opClient.NewRPCWithClient(ctx, logger, cfg.L1EthRpc, opClient.NewBaseRPCClient(l1Client.Client()), cfg.PollInterval)
 	if err != nil {