op-e2e: Specify correct l2 block number when create dispute games

Should fix flakiness when creating games as the previous hard coded block number may not have had suitable outputs published.

op-e2e/e2eutils/disputegame/helper.go

@@ -84,7 +84,7 @@ func NewFactoryHelper(t *testing.T, ctx context.Context, deployments *genesis.L1
 }
 
 func (h *FactoryHelper) StartAlphabetGame(ctx context.Context, claimedAlphabet string) *AlphabetGameHelper {
-	h.waitForProposals(ctx)
+	l2BlockNumber := h.waitForProposals(ctx)
 	l1Head := h.checkpointL1Block(ctx)
 
 	ctx, cancel := context.WithTimeout(ctx, 1*time.Minute)
@@ -94,7 +94,7 @@ func (h *FactoryHelper) StartAlphabetGame(ctx context.Context, claimedAlphabet s
 	rootClaim, err := trace.Get(ctx, lastAlphabetTraceIndex)
 	h.require.NoError(err, "get root claim")
 	extraData := make([]byte, 64)
-	binary.BigEndian.PutUint64(extraData[24:], uint64(8))
+	binary.BigEndian.PutUint64(extraData[24:], l2BlockNumber)
 	binary.BigEndian.PutUint64(extraData[56:], l1Head.Uint64())
 	tx, err := h.factory.Create(h.opts, alphabetGameType, rootClaim, extraData)
 	h.require.NoError(err, "create fault dispute game")
@@ -120,14 +120,14 @@ func (h *FactoryHelper) StartAlphabetGame(ctx context.Context, claimedAlphabet s
 }
 
 func (h *FactoryHelper) StartCannonGame(ctx context.Context, rootClaim common.Hash) *CannonGameHelper {
-	h.waitForProposals(ctx)
+	l2BlockNumber := h.waitForProposals(ctx)
 	l1Head := h.checkpointL1Block(ctx)
 
 	ctx, cancel := context.WithTimeout(ctx, 1*time.Minute)
 	defer cancel()
 
 	extraData := make([]byte, 64)
-	binary.BigEndian.PutUint64(extraData[24:], uint64(8))
+	binary.BigEndian.PutUint64(extraData[24:], l2BlockNumber)
 	binary.BigEndian.PutUint64(extraData[56:], l1Head.Uint64())
 	tx, err := h.factory.Create(h.opts, cannonGameType, rootClaim, extraData)
 	h.require.NoError(err, "create fault dispute game")
@@ -153,20 +153,30 @@ func (h *FactoryHelper) StartCannonGame(ctx context.Context, rootClaim common.Ha
 
 // waitForProposals waits until there are at least two proposals in the output oracle
 // This is the minimum required for creating a game.
-func (h *FactoryHelper) waitForProposals(ctx context.Context) {
-
+// Returns the l2 block number of the latest available proposal
+func (h *FactoryHelper) waitForProposals(ctx context.Context) uint64 {
 	ctx, cancel := context.WithTimeout(ctx, 2*time.Minute)
 	defer cancel()
-	err := utils.WaitFor(ctx, time.Second, func() (bool, error) {
-		index, err := h.l2oo.LatestOutputIndex(&bind.CallOpts{Context: ctx})
+	opts := &bind.CallOpts{Context: ctx}
+	latestOutputIndex, err := utils.WaitAndGet(
+		ctx,
+		time.Second,
+		func() (*big.Int, error) {
+			index, err := h.l2oo.LatestOutputIndex(opts)
 			if err != nil {
 				h.t.Logf("Could not get latest output index: %v", err.Error())
-			return false, nil
+				return nil, nil
 			}
 			h.t.Logf("Latest output index: %v", index)
-		return index.Cmp(big.NewInt(1)) >= 0, nil
+			return index, nil
+		},
+		func(index *big.Int) bool {
+			return index != nil && index.Cmp(big.NewInt(1)) >= 0
 		})
 	h.require.NoError(err, "Did not get two output roots")
+	output, err := h.l2oo.GetL2Output(opts, latestOutputIndex)
+	h.require.NoErrorf(err, "Could not get latst output root index: %v", latestOutputIndex)
+	return output.L2BlockNumber.Uint64()
 }
 
 // checkpointL1Block stores the current L1 block in the oracle

op-e2e/faultproof_test.go

@@ -21,6 +21,7 @@ func TestResolveDisputeGame(t *testing.T) {
 	t.Cleanup(sys.Close)
 
 	disputeGameFactory := disputegame.NewFactoryHelper(t, ctx, sys.cfg.L1Deployments, l1Client)
+
 	game := disputeGameFactory.StartAlphabetGame(ctx, "zyxwvut")
 	require.NotNil(t, game)
 	gameDuration := game.GameDuration(ctx)