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package l1
import (
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
preimage "github.com/ethereum-optimism/optimism/op-preimage"
"github.com/ethereum-optimism/optimism/op-program/client/mpt"
"github.com/ethereum-optimism/optimism/op-service/eth"
)
type Oracle interface {
// HeaderByBlockHash retrieves the block header with the given hash.
HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo
// TransactionsByBlockHash retrieves the transactions from the block with the given hash.
TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions)
// ReceiptsByBlockHash retrieves the receipts from the block with the given hash.
ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts)
}
// PreimageOracle implements Oracle using by interfacing with the pure preimage.Oracle
// to fetch pre-images to decode into the requested data.
type PreimageOracle struct {
oracle preimage.Oracle
hint preimage.Hinter
}
var _ Oracle = (*PreimageOracle)(nil)
func NewPreimageOracle(raw preimage.Oracle, hint preimage.Hinter) *PreimageOracle {
return &PreimageOracle{
oracle: raw,
hint: hint,
}
}
func (p *PreimageOracle) headerByBlockHash(blockHash common.Hash) *types.Header {
p.hint.Hint(BlockHeaderHint(blockHash))
headerRlp := p.oracle.Get(preimage.Keccak256Key(blockHash))
var header types.Header
if err := rlp.DecodeBytes(headerRlp, &header); err != nil {
panic(fmt.Errorf("invalid block header %s: %w", blockHash, err))
}
return &header
}
func (p *PreimageOracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
return eth.HeaderBlockInfo(p.headerByBlockHash(blockHash))
}
func (p *PreimageOracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
header := p.headerByBlockHash(blockHash)
p.hint.Hint(TransactionsHint(blockHash))
opaqueTxs := mpt.ReadTrie(header.TxHash, func(key common.Hash) []byte {
return p.oracle.Get(preimage.Keccak256Key(key))
})
txs, err := eth.DecodeTransactions(opaqueTxs)
if err != nil {
panic(fmt.Errorf("failed to decode list of txs: %w", err))
}
return eth.HeaderBlockInfo(header), txs
}
func (p *PreimageOracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
info, txs := p.TransactionsByBlockHash(blockHash)
p.hint.Hint(ReceiptsHint(blockHash))
opaqueReceipts := mpt.ReadTrie(info.ReceiptHash(), func(key common.Hash) []byte {
return p.oracle.Get(preimage.Keccak256Key(key))
})
txHashes := eth.TransactionsToHashes(txs)
receipts, err := eth.DecodeRawReceipts(eth.ToBlockID(info), opaqueReceipts, txHashes)
if err != nil {
panic(fmt.Errorf("bad receipts data for block %s: %w", blockHash, err))
}
return info, receipts
}