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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rawdb
import (
"github.com/dexon-foundation/dexon/common"
"github.com/dexon-foundation/dexon/core/types"
"github.com/dexon-foundation/dexon/log"
"github.com/dexon-foundation/dexon/rlp"
)
// ReadTxLookupEntry retrieves the positional metadata associated with a transaction
// hash to allow retrieving the transaction or receipt by hash.
func ReadTxLookupEntry(db DatabaseReader, hash common.Hash) (common.Hash, uint64, uint64) {
data, _ := db.Get(txLookupKey(hash))
if len(data) == 0 {
return common.Hash{}, 0, 0
}
var entry TxLookupEntry
if err := rlp.DecodeBytes(data, &entry); err != nil {
log.Error("Invalid transaction lookup entry RLP", "hash", hash, "err", err)
return common.Hash{}, 0, 0
}
return entry.BlockHash, entry.BlockIndex, entry.Index
}
// WriteTxLookupEntries stores a positional metadata for every transaction from
// a block, enabling hash based transaction and receipt lookups.
func WriteTxLookupEntries(db DatabaseWriter, block *types.Block) {
for i, tx := range block.Transactions() {
entry := TxLookupEntry{
BlockHash: block.Hash(),
BlockIndex: block.NumberU64(),
Index: uint64(i),
}
data, err := rlp.EncodeToBytes(entry)
if err != nil {
log.Crit("Failed to encode transaction lookup entry", "err", err)
}
if err := db.Put(txLookupKey(tx.Hash()), data); err != nil {
log.Crit("Failed to store transaction lookup entry", "err", err)
}
}
}
// DeleteTxLookupEntry removes all transaction data associated with a hash.
func DeleteTxLookupEntry(db DatabaseDeleter, hash common.Hash) {
db.Delete(txLookupKey(hash))
}
// ReadTransaction retrieves a specific transaction from the database, along with
// its added positional metadata.
func ReadTransaction(db DatabaseReader, hash common.Hash) (*types.Transaction, common.Hash, uint64, uint64) {
blockHash, blockNumber, txIndex := ReadTxLookupEntry(db, hash)
if blockHash == (common.Hash{}) {
return nil, common.Hash{}, 0, 0
}
body := ReadBody(db, blockHash, blockNumber)
if body == nil || len(body.Transactions) <= int(txIndex) {
log.Error("Transaction referenced missing", "number", blockNumber, "hash", blockHash, "index", txIndex)
return nil, common.Hash{}, 0, 0
}
return body.Transactions[txIndex], blockHash, blockNumber, txIndex
}
// ReadReceipt retrieves a specific transaction receipt from the database, along with
// its added positional metadata.
func ReadReceipt(db DatabaseReader, hash common.Hash) (*types.Receipt, common.Hash, uint64, uint64) {
blockHash, blockNumber, receiptIndex := ReadTxLookupEntry(db, hash)
if blockHash == (common.Hash{}) {
return nil, common.Hash{}, 0, 0
}
receipts := ReadReceipts(db, blockHash, blockNumber)
if len(receipts) <= int(receiptIndex) {
log.Error("Receipt refereced missing", "number", blockNumber, "hash", blockHash, "index", receiptIndex)
return nil, common.Hash{}, 0, 0
}
return receipts[receiptIndex], blockHash, blockNumber, receiptIndex
}
// ReadBloomBits retrieves the compressed bloom bit vector belonging to the given
// section and bit index from the.
func ReadBloomBits(db DatabaseReader, bit uint, section uint64, head common.Hash) ([]byte, error) {
return db.Get(bloomBitsKey(bit, section, head))
}
// WriteBloomBits stores the compressed bloom bits vector belonging to the given
// section and bit index.
func WriteBloomBits(db DatabaseWriter, bit uint, section uint64, head common.Hash, bits []byte) {
if err := db.Put(bloomBitsKey(bit, section, head), bits); err != nil {
log.Crit("Failed to store bloom bits", "err", err)
}
}
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