github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/core/rawdb/accessors_indexes.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 19:16:35</date>
    10  //</624450079364747264>
    11  
    12  
    13  package rawdb
    14  
    15  import (
    16  	"github.com/ethereum/go-ethereum/common"
    17  	"github.com/ethereum/go-ethereum/core/types"
    18  	"github.com/ethereum/go-ethereum/log"
    19  	"github.com/ethereum/go-ethereum/rlp"
    20  )
    21  
    22  //Read TxLoopUpTeAccess检索与事务关联的位置元数据
    23  //哈希以允许按哈希检索事务或收据。
    24  func ReadTxLookupEntry(db DatabaseReader, hash common.Hash) (common.Hash, uint64, uint64) {
    25  	data, _ := db.Get(txLookupKey(hash))
    26  	if len(data) == 0 {
    27  		return common.Hash{}, 0, 0
    28  	}
    29  	var entry TxLookupEntry
    30  	if err := rlp.DecodeBytes(data, &entry); err != nil {
    31  		log.Error("Invalid transaction lookup entry RLP", "hash", hash, "err", err)
    32  		return common.Hash{}, 0, 0
    33  	}
    34  	return entry.BlockHash, entry.BlockIndex, entry.Index
    35  }
    36  
    37  //WraveTxLoopUpStand为每个事务存储位置元数据。
    38  //一个块，启用基于哈希的事务和收据查找。
    39  func WriteTxLookupEntries(db DatabaseWriter, block *types.Block) {
    40  	for i, tx := range block.Transactions() {
    41  		entry := TxLookupEntry{
    42  			BlockHash:  block.Hash(),
    43  			BlockIndex: block.NumberU64(),
    44  			Index:      uint64(i),
    45  		}
    46  		data, err := rlp.EncodeToBytes(entry)
    47  		if err != nil {
    48  			log.Crit("Failed to encode transaction lookup entry", "err", err)
    49  		}
    50  		if err := db.Put(txLookupKey(tx.Hash()), data); err != nil {
    51  			log.Crit("Failed to store transaction lookup entry", "err", err)
    52  		}
    53  	}
    54  }
    55  
    56  //DeleteTxLookupEntry删除与哈希关联的所有事务数据。
    57  func DeleteTxLookupEntry(db DatabaseDeleter, hash common.Hash) {
    58  	db.Delete(txLookupKey(hash))
    59  }
    60  
    61  //readTransaction从数据库中检索特定事务，以及
    62  //它添加了位置元数据。
    63  func ReadTransaction(db DatabaseReader, hash common.Hash) (*types.Transaction, common.Hash, uint64, uint64) {
    64  	blockHash, blockNumber, txIndex := ReadTxLookupEntry(db, hash)
    65  	if blockHash == (common.Hash{}) {
    66  		return nil, common.Hash{}, 0, 0
    67  	}
    68  	body := ReadBody(db, blockHash, blockNumber)
    69  	if body == nil || len(body.Transactions) <= int(txIndex) {
    70  		log.Error("Transaction referenced missing", "number", blockNumber, "hash", blockHash, "index", txIndex)
    71  		return nil, common.Hash{}, 0, 0
    72  	}
    73  	return body.Transactions[txIndex], blockHash, blockNumber, txIndex
    74  }
    75  
    76  //readreceipt从数据库中检索特定的事务回执，以及
    77  //它添加了位置元数据。
    78  func ReadReceipt(db DatabaseReader, hash common.Hash) (*types.Receipt, common.Hash, uint64, uint64) {
    79  	blockHash, blockNumber, receiptIndex := ReadTxLookupEntry(db, hash)
    80  	if blockHash == (common.Hash{}) {
    81  		return nil, common.Hash{}, 0, 0
    82  	}
    83  	receipts := ReadReceipts(db, blockHash, blockNumber)
    84  	if len(receipts) <= int(receiptIndex) {
    85  		log.Error("Receipt refereced missing", "number", blockNumber, "hash", blockHash, "index", receiptIndex)
    86  		return nil, common.Hash{}, 0, 0
    87  	}
    88  	return receipts[receiptIndex], blockHash, blockNumber, receiptIndex
    89  }
    90  
    91  //readBloomBits检索属于给定的
    92  //中的节和位索引。
    93  func ReadBloomBits(db DatabaseReader, bit uint, section uint64, head common.Hash) ([]byte, error) {
    94  	return db.Get(bloomBitsKey(bit, section, head))
    95  }
    96  
    97  //WriteBloomBits存储属于给定的
    98  //节和位索引。
    99  func WriteBloomBits(db DatabaseWriter, bit uint, section uint64, head common.Hash, bits []byte) {
   100  	if err := db.Put(bloomBitsKey(bit, section, head), bits); err != nil {
   101  		log.Crit("Failed to store bloom bits", "err", err)
   102  	}
   103  }
   104