mirror of
https://github.com/ethereum/go-ethereum.git
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85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rawdb
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import (
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"encoding/json"
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"errors"
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"github.com/XinFinOrg/XDPoSChain/common"
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"github.com/XinFinOrg/XDPoSChain/ethdb"
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"github.com/XinFinOrg/XDPoSChain/log"
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"github.com/XinFinOrg/XDPoSChain/params"
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"github.com/XinFinOrg/XDPoSChain/rlp"
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)
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// ReadDatabaseVersion retrieves the version number of the database.
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func ReadDatabaseVersion(db ethdb.KeyValueReader) *uint64 {
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var version uint64
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enc, _ := db.Get(databaseVersionKey)
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if len(enc) == 0 {
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return nil
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}
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if err := rlp.DecodeBytes(enc, &version); err != nil {
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return nil
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}
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return &version
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}
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// WriteDatabaseVersion stores the version number of the database
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func WriteDatabaseVersion(db ethdb.KeyValueWriter, version uint64) {
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enc, err := rlp.EncodeToBytes(version)
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if err != nil {
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log.Crit("Failed to encode database version", "err", err)
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}
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if err = db.Put(databaseVersionKey, enc); err != nil {
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log.Crit("Failed to store the database version", "err", err)
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}
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}
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// ReadChainConfig will fetch the network settings based on the given hash.
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func ReadChainConfig(db ethdb.KeyValueReader, hash common.Hash) (*params.ChainConfig, error) {
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jsonChainConfig, _ := db.Get(configKey(hash))
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if len(jsonChainConfig) == 0 {
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return nil, errors.New("ChainConfig not found") // general config not found error
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}
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var config params.ChainConfig
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if err := json.Unmarshal(jsonChainConfig, &config); err != nil {
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return nil, err
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}
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return &config, nil
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}
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// WriteChainConfig writes the chain config settings to the database.
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func WriteChainConfig(db ethdb.KeyValueWriter, hash common.Hash, cfg *params.ChainConfig) error {
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// short circuit and ignore if nil config. GetChainConfig
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// will return a default.
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if cfg == nil {
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return nil
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}
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data, err := json.Marshal(cfg)
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if err != nil {
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log.Crit("Failed to JSON encode chain config", "err", err)
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return err
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}
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return db.Put(configKey(hash), data)
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}
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