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// Copyright 2016 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 eth implements the Ethereum protocol.
package eth
import (
"bytes"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
)
var deduplicateData = []byte("dbUpgrade_20170714deduplicateData")
// upgradeDeduplicateData checks the chain database version and
// starts a background process to make upgrades if necessary.
// Returns a stop function that blocks until the process has
// been safely stopped.
func upgradeDeduplicateData(db ethdb.Database) func() error {
// If the database is already converted or empty, bail out
data, _ := db.Get(deduplicateData)
if len(data) > 0 && data[0] == 42 {
return nil
}
if data, _ := db.Get([]byte("LastHeader")); len(data) == 0 {
db.Put(deduplicateData, []byte{42})
return nil
}
// Start the deduplication upgrade on a new goroutine
log.Warn("Upgrading database to use lookup entries")
stop := make(chan chan error)
go func() {
// Create an iterator to read the entire database and covert old lookup entires
it := db.(*ethdb.LDBDatabase).NewIterator()
defer func() {
if it != nil {
it.Release()
}
}()
var (
converted uint64
failed error
)
for failed == nil && it.Next() {
// Skip any entries that don't look like old transaction meta entries (<hash>0x01)
key := it.Key()
if len(key) != common.HashLength+1 || key[common.HashLength] != 0x01 {
continue
}
// Skip any entries that don't contain metadata (name clash between <hash>0x01 and <some-prefix><hash>)
var meta struct {
BlockHash common.Hash
BlockIndex uint64
Index uint64
}
if err := rlp.DecodeBytes(it.Value(), &meta); err != nil {
continue
}
// Skip any already upgraded entries (clash due to <hash> ending with 0x01 (old suffix))
hash := key[:common.HashLength]
if hash[0] == byte('l') {
// Potential clash, the "old" `hash` must point to a live transaction.
if tx, _, _, _ := core.GetTransaction(db, common.BytesToHash(hash)); tx == nil || !bytes.Equal(tx.Hash().Bytes(), hash) {
continue
}
}
// Convert the old metadata to a new lookup entry, delete duplicate data
if failed = db.Put(append([]byte("l"), hash...), it.Value()); failed == nil { // Write the new lookup entry
if failed = db.Delete(hash); failed == nil { // Delete the duplicate transaction data
if failed = db.Delete(append([]byte("receipts-"), hash...)); failed == nil { // Delete the duplicate receipt data
if failed = db.Delete(key); failed != nil { // Delete the old transaction metadata
break
}
}
}
}
// Bump the conversion counter, and recreate the iterator occasionally to
// avoid too high memory consumption.
converted++
if converted%100000 == 0 {
it.Release()
it = db.(*ethdb.LDBDatabase).NewIterator()
it.Seek(key)
log.Info("Deduplicating database entries", "deduped", converted)
}
// Check for termination, or continue after a bit of a timeout
select {
case errc := <-stop:
errc <- nil
return
case <-time.After(time.Microsecond * 100):
}
}
// Upgrade finished, mark a such and terminate
if failed == nil {
log.Info("Database deduplication successful", "deduped", converted)
db.Put(deduplicateData, []byte{42})
} else {
log.Error("Database deduplication failed", "deduped", converted, "err", failed)
}
it.Release()
it = nil
errc := <-stop
errc <- failed
}()
// Assembly the cancellation callback
return func() error {
errc := make(chan error)
stop <- errc
return <-errc
}
}
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