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package derive
import (
"fmt"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum-optimism/optimism/op-node/eth"
"github.com/ethereum-optimism/optimism/op-node/rollup"
)
// PayloadToBlockRef extracts the essential L2BlockRef information from an execution payload,
// falling back to genesis information if necessary.
func PayloadToBlockRef(payload *eth.ExecutionPayload, genesis *rollup.Genesis) (eth.L2BlockRef, error) {
var l1Origin eth.BlockID
var sequenceNumber uint64
if uint64(payload.BlockNumber) == genesis.L2.Number {
if payload.BlockHash != genesis.L2.Hash {
return eth.L2BlockRef{}, fmt.Errorf("expected L2 genesis hash to match L2 block at genesis block number %d: %s <> %s", genesis.L2.Number, payload.BlockHash, genesis.L2.Hash)
}
l1Origin = genesis.L1
sequenceNumber = 0
} else {
if len(payload.Transactions) == 0 {
return eth.L2BlockRef{}, fmt.Errorf("l2 block is missing L1 info deposit tx, block hash: %s", payload.BlockHash)
}
var tx types.Transaction
if err := tx.UnmarshalBinary(payload.Transactions[0]); err != nil {
return eth.L2BlockRef{}, fmt.Errorf("failed to decode first tx to read l1 info from: %w", err)
}
if tx.Type() != types.DepositTxType {
return eth.L2BlockRef{}, fmt.Errorf("first payload tx has unexpected tx type: %d", tx.Type())
}
info, err := L1InfoDepositTxData(tx.Data())
if err != nil {
return eth.L2BlockRef{}, fmt.Errorf("failed to parse L1 info deposit tx from L2 block: %w", err)
}
l1Origin = eth.BlockID{Hash: info.BlockHash, Number: info.Number}
sequenceNumber = info.SequenceNumber
}
return eth.L2BlockRef{
Hash: payload.BlockHash,
Number: uint64(payload.BlockNumber),
ParentHash: payload.ParentHash,
Time: uint64(payload.Timestamp),
L1Origin: l1Origin,
SequenceNumber: sequenceNumber,
}, nil
}
func PayloadToSystemConfig(payload *eth.ExecutionPayload, cfg *rollup.Config) (eth.SystemConfig, error) {
if uint64(payload.BlockNumber) == cfg.Genesis.L2.Number {
if payload.BlockHash != cfg.Genesis.L2.Hash {
return eth.SystemConfig{}, fmt.Errorf("expected L2 genesis hash to match L2 block at genesis block number %d: %s <> %s", cfg.Genesis.L2.Number, payload.BlockHash, cfg.Genesis.L2.Hash)
}
return cfg.Genesis.SystemConfig, nil
} else {
if len(payload.Transactions) == 0 {
return eth.SystemConfig{}, fmt.Errorf("l2 block is missing L1 info deposit tx, block hash: %s", payload.BlockHash)
}
var tx types.Transaction
if err := tx.UnmarshalBinary(payload.Transactions[0]); err != nil {
return eth.SystemConfig{}, fmt.Errorf("failed to decode first tx to read l1 info from: %w", err)
}
if tx.Type() != types.DepositTxType {
return eth.SystemConfig{}, fmt.Errorf("first payload tx has unexpected tx type: %d", tx.Type())
}
info, err := L1InfoDepositTxData(tx.Data())
if err != nil {
return eth.SystemConfig{}, fmt.Errorf("failed to parse L1 info deposit tx from L2 block: %w", err)
}
return eth.SystemConfig{
BatcherAddr: info.BatcherAddr,
Overhead: info.L1FeeOverhead,
Scalar: info.L1FeeScalar,
GasLimit: uint64(payload.GasLimit),
}, err
}
}