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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"
- "time"
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/ethdb"
- "github.com/ethereum/go-ethereum/log"
- "github.com/ethereum/go-ethereum/params"
- "github.com/ethereum/go-ethereum/rlp"
- )
- // ReadDatabaseVersion retrieves the version number of the database.
- func ReadDatabaseVersion(db ethdb.KeyValueReader) *uint64 {
- var version uint64
- enc, _ := db.Get(databaseVersionKey)
- 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 ethdb.KeyValueWriter, version uint64) {
- enc, err := rlp.EncodeToBytes(version)
- if err != nil {
- log.Crit("Failed to encode database version", "err", err)
- }
- if err = db.Put(databaseVersionKey, 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 ethdb.KeyValueReader, 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 ethdb.KeyValueWriter, 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)
- }
- }
- // crashList is a list of unclean-shutdown-markers, for rlp-encoding to the
- // database
- type crashList struct {
- Discarded uint64 // how many ucs have we deleted
- Recent []uint64 // unix timestamps of 10 latest unclean shutdowns
- }
- const crashesToKeep = 10
- // PushUncleanShutdownMarker appends a new unclean shutdown marker and returns
- // the previous data
- // - a list of timestamps
- // - a count of how many old unclean-shutdowns have been discarded
- func PushUncleanShutdownMarker(db ethdb.KeyValueStore) ([]uint64, uint64, error) {
- var uncleanShutdowns crashList
- // Read old data
- if data, err := db.Get(uncleanShutdownKey); err != nil {
- log.Warn("Error reading unclean shutdown markers", "error", err)
- } else if err := rlp.DecodeBytes(data, &uncleanShutdowns); err != nil {
- return nil, 0, err
- }
- var discarded = uncleanShutdowns.Discarded
- var previous = make([]uint64, len(uncleanShutdowns.Recent))
- copy(previous, uncleanShutdowns.Recent)
- // Add a new (but cap it)
- uncleanShutdowns.Recent = append(uncleanShutdowns.Recent, uint64(time.Now().Unix()))
- if count := len(uncleanShutdowns.Recent); count > crashesToKeep+1 {
- numDel := count - (crashesToKeep + 1)
- uncleanShutdowns.Recent = uncleanShutdowns.Recent[numDel:]
- uncleanShutdowns.Discarded += uint64(numDel)
- }
- // And save it again
- data, _ := rlp.EncodeToBytes(uncleanShutdowns)
- if err := db.Put(uncleanShutdownKey, data); err != nil {
- log.Warn("Failed to write unclean-shutdown marker", "err", err)
- return nil, 0, err
- }
- return previous, discarded, nil
- }
- // PopUncleanShutdownMarker removes the last unclean shutdown marker
- func PopUncleanShutdownMarker(db ethdb.KeyValueStore) {
- var uncleanShutdowns crashList
- // Read old data
- if data, err := db.Get(uncleanShutdownKey); err != nil {
- log.Warn("Error reading unclean shutdown markers", "error", err)
- } else if err := rlp.DecodeBytes(data, &uncleanShutdowns); err != nil {
- log.Error("Error decoding unclean shutdown markers", "error", err) // Should mos def _not_ happen
- }
- if l := len(uncleanShutdowns.Recent); l > 0 {
- uncleanShutdowns.Recent = uncleanShutdowns.Recent[:l-1]
- }
- data, _ := rlp.EncodeToBytes(uncleanShutdowns)
- if err := db.Put(uncleanShutdownKey, data); err != nil {
- log.Warn("Failed to clear unclean-shutdown marker", "err", err)
- }
- }
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