github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/core/rawdb/accessors_metadata.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package rawdb
    19  
    20  import (
    21  	"encoding/json"
    22  
    23  	"github.com/AigarNetwork/aigar/common"
    24  	"github.com/AigarNetwork/aigar/ethdb"
    25  	"github.com/AigarNetwork/aigar/log"
    26  	"github.com/AigarNetwork/aigar/params"
    27  	"github.com/AigarNetwork/aigar/rlp"
    28  )
    29  
    30  // ReadDatabaseVersion retrieves the version number of the database.
    31  func ReadDatabaseVersion(db ethdb.KeyValueReader) *uint64 {
    32  	var version uint64
    33  
    34  	enc, _ := db.Get(databaseVerisionKey)
    35  	if len(enc) == 0 {
    36  		return nil
    37  	}
    38  	if err := rlp.DecodeBytes(enc, &version); err != nil {
    39  		return nil
    40  	}
    41  
    42  	return &version
    43  }
    44  
    45  // WriteDatabaseVersion stores the version number of the database
    46  func WriteDatabaseVersion(db ethdb.KeyValueWriter, version uint64) {
    47  	enc, err := rlp.EncodeToBytes(version)
    48  	if err != nil {
    49  		log.Crit("Failed to encode database version", "err", err)
    50  	}
    51  	if err = db.Put(databaseVerisionKey, enc); err != nil {
    52  		log.Crit("Failed to store the database version", "err", err)
    53  	}
    54  }
    55  
    56  // ReadChainConfig retrieves the consensus settings based on the given genesis hash.
    57  func ReadChainConfig(db ethdb.KeyValueReader, hash common.Hash) *params.ChainConfig {
    58  	data, _ := db.Get(configKey(hash))
    59  	if len(data) == 0 {
    60  		return nil
    61  	}
    62  	var config params.ChainConfig
    63  	if err := json.Unmarshal(data, &config); err != nil {
    64  		log.Error("Invalid chain config JSON", "hash", hash, "err", err)
    65  		return nil
    66  	}
    67  	return &config
    68  }
    69  
    70  // WriteChainConfig writes the chain config settings to the database.
    71  func WriteChainConfig(db ethdb.KeyValueWriter, hash common.Hash, cfg *params.ChainConfig) {
    72  	if cfg == nil {
    73  		return
    74  	}
    75  	data, err := json.Marshal(cfg)
    76  	if err != nil {
    77  		log.Crit("Failed to JSON encode chain config", "err", err)
    78  	}
    79  	if err := db.Put(configKey(hash), data); err != nil {
    80  		log.Crit("Failed to store chain config", "err", err)
    81  	}
    82  }
    83  
    84  // ReadPreimage retrieves a single preimage of the provided hash.
    85  func ReadPreimage(db ethdb.KeyValueReader, hash common.Hash) []byte {
    86  	data, _ := db.Get(preimageKey(hash))
    87  	return data
    88  }
    89  
    90  // WritePreimages writes the provided set of preimages to the database.
    91  func WritePreimages(db ethdb.KeyValueWriter, preimages map[common.Hash][]byte) {
    92  	for hash, preimage := range preimages {
    93  		if err := db.Put(preimageKey(hash), preimage); err != nil {
    94  			log.Crit("Failed to store trie preimage", "err", err)
    95  		}
    96  	}
    97  	preimageCounter.Inc(int64(len(preimages)))
    98  	preimageHitCounter.Inc(int64(len(preimages)))
    99  }