github.com/core-coin/go-core/v2@v2.1.9/core/rawdb/accessors_metadata.go (about)

     1  // Copyright 2018 by the Authors
     2  // This file is part of the go-core library.
     3  //
     4  // The go-core library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-core library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-core library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package rawdb
    18  
    19  import (
    20  	"encoding/json"
    21  
    22  	"github.com/core-coin/go-core/v2/xcbdb"
    23  
    24  	"github.com/core-coin/go-core/v2/common"
    25  	"github.com/core-coin/go-core/v2/log"
    26  	"github.com/core-coin/go-core/v2/params"
    27  	"github.com/core-coin/go-core/v2/rlp"
    28  )
    29  
    30  // ReadDatabaseVersion retrieves the version number of the database.
    31  func ReadDatabaseVersion(db xcbdb.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 xcbdb.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 xcbdb.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 xcbdb.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  }