feat(driver): introduce StateVariablesUpdated event (#666)

Co-authored-by: maskpp <maskpp266@gmail.com>

bindings/.githead

@@ -1 +1 @@
-fcc2800cc95a6b92e4a8d11c9d5e15d0ed0abeca
+dd4136ae250a8696953a331c13de0a04a67df096

driver/chain_syncer/calldata/syncer.go

@@ -416,13 +416,11 @@ func (s *Syncer) fillForkchoiceState(
 	}
 
 	// Fetch the latest verified block's header from protocol.
-	variables, err := s.rpc.GetProtocolStateVariables(
-		&bind.CallOpts{Context: ctx, BlockNumber: new(big.Int).SetUint64(event.Raw.BlockNumber)},
-	)
+	variables, err := s.rpc.GetTaikoDataSlotBByNumber(ctx, event.Raw.BlockNumber)
 	if err != nil {
 		return err
 	}
-	finalizeHeader, err := s.rpc.L2.HeaderByNumber(ctx, new(big.Int).SetUint64(variables.B.LastVerifiedBlockId))
+	finalizeHeader, err := s.rpc.L2.HeaderByNumber(ctx, new(big.Int).SetUint64(variables.LastVerifiedBlockId))
 	if err != nil {
 		return err
 	}
@@ -597,9 +595,11 @@ func (s *Syncer) retrievePastBlock(
 		l1Origin, err := s.rpc.L2.L1OriginByID(ctx, new(big.Int).SetUint64(currentBlockID))
 		if err != nil {
 			if err.Error() == ethereum.NotFound.Error() {
-				log.Info("L1Origin not found in retrievePastBlock because the L2 EE is just synced through P2P",
+				log.Info(
+					"L1Origin not found in retrievePastBlock because the L2 EE is just synced through P2P",
 					"blockID",
-					currentBlockID)
+					currentBlockID,
+				)
 				// Can't find l1Origin in L2 EE, so we call the contract to get block info
 				blockInfo, err := s.rpc.TaikoL1.GetBlock(&bind.CallOpts{Context: ctx}, currentBlockID)
 				if err != nil {

pkg/rpc/methods.go

@@ -685,3 +685,19 @@ func (c *Client) GetTiers(ctx context.Context) ([]*TierProviderTierWithID, error
 
 	return tiers, nil
 }
+
+// GetTaikoDataSlotBByNumber fetches the state variables by block number.
+func (c *Client) GetTaikoDataSlotBByNumber(ctx context.Context, number uint64) (*bindings.TaikoDataSlotB, error) {
+	iter, err := c.TaikoL1.FilterStateVariablesUpdated(
+		&bind.FilterOpts{Context: ctx, Start: number, End: &number},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	for iter.Next() {
+		return &iter.Event.SlotB, nil
+	}
+
+	return nil, fmt.Errorf("failed to get state variables by block number %d", number)
+}