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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 (
"encoding/json"
"github.com/dexon-foundation/dexon/common"
"github.com/dexon-foundation/dexon/log"
"github.com/dexon-foundation/dexon/params"
"github.com/dexon-foundation/dexon/rlp"
)
// ReadDatabaseVersion retrieves the version number of the database.
func ReadDatabaseVersion(db DatabaseReader) *uint64 {
var version uint64
enc, _ := db.Get(databaseVerisionKey)
if len(enc) == 0 {
return nil
}
if err := rlp.DecodeBytes(enc, &version); err != nil {
return nil
}
return &version
}
// WriteDatabaseVersion stores the version number of the database
func WriteDatabaseVersion(db DatabaseWriter, version uint64) {
enc, err := rlp.EncodeToBytes(version)
if err != nil {
log.Crit("Failed to encode database version", "err", err)
}
if err = db.Put(databaseVerisionKey, enc); err != nil {
log.Crit("Failed to store the database version", "err", err)
}
}
// ReadChainConfig retrieves the consensus settings based on the given genesis hash.
func ReadChainConfig(db DatabaseReader, hash common.Hash) *params.ChainConfig {
data, _ := db.Get(configKey(hash))
if len(data) == 0 {
return nil
}
var config params.ChainConfig
if err := json.Unmarshal(data, &config); err != nil {
log.Error("Invalid chain config JSON", "hash", hash, "err", err)
return nil
}
return &config
}
// WriteChainConfig writes the chain config settings to the database.
func WriteChainConfig(db DatabaseWriter, hash common.Hash, cfg *params.ChainConfig) {
if cfg == nil {
return
}
data, err := json.Marshal(cfg)
if err != nil {
log.Crit("Failed to JSON encode chain config", "err", err)
}
if err := db.Put(configKey(hash), data); err != nil {
log.Crit("Failed to store chain config", "err", err)
}
}
// ReadPreimage retrieves a single preimage of the provided hash.
func ReadPreimage(db DatabaseReader, hash common.Hash) []byte {
data, _ := db.Get(preimageKey(hash))
return data
}
// WritePreimages writes the provided set of preimages to the database.
func WritePreimages(db DatabaseWriter, preimages map[common.Hash][]byte) {
for hash, preimage := range preimages {
if err := db.Put(preimageKey(hash), preimage); err != nil {
log.Crit("Failed to store trie preimage", "err", err)
}
}
preimageCounter.Inc(int64(len(preimages)))
preimageHitCounter.Inc(int64(len(preimages)))
}
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