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upgrade.go
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upgrade.go
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// Copyright (c) 2013-2016 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package blockchain
import (
"github.com/decred/dcrd/blockchain/internal/progresslog"
"github.com/decred/dcrd/blockchain/stake"
"github.com/decred/dcrd/chaincfg/chainhash"
"github.com/decred/dcrd/database"
)
// upgradeToVersion2 upgrades a version 1 blockchain to version 2, allowing
// use of the new on-disk ticket database.
func (b *BlockChain) upgradeToVersion2() error {
log.Infof("Initializing upgrade to database version 2")
best := b.BestSnapshot()
progressLogger := progresslog.NewBlockProgressLogger("Upgraded", log)
// The upgrade is atomic, so there is no need to set the flag that
// the database is undergoing an upgrade here. Get the stake node
// for the genesis block, and then begin connecting stake nodes
// incrementally.
err := b.db.Update(func(dbTx database.Tx) error {
bestStakeNode, errLocal := stake.InitDatabaseState(dbTx, b.chainParams)
if errLocal != nil {
return errLocal
}
parent, errLocal := dbFetchBlockByHeight(dbTx, 0)
if errLocal != nil {
return errLocal
}
for i := int64(1); i <= best.Height; i++ {
block, errLocal := dbFetchBlockByHeight(dbTx, i)
if errLocal != nil {
return errLocal
}
// If we need the tickets, fetch them too.
var newTickets []chainhash.Hash
if i >= b.chainParams.StakeEnabledHeight {
matureHeight := i - int64(b.chainParams.TicketMaturity)
matureBlock, errLocal := dbFetchBlockByHeight(dbTx, matureHeight)
if errLocal != nil {
return errLocal
}
for _, stx := range matureBlock.MsgBlock().STransactions {
if is, _ := stake.IsSStx(stx); is {
h := stx.TxSha()
newTickets = append(newTickets, h)
}
}
}
// Iteratively connect the stake nodes in memory.
header := block.MsgBlock().Header
bestStakeNode, errLocal = bestStakeNode.ConnectNode(header,
ticketsSpentInBlock(block), ticketsRevokedInBlock(block),
newTickets)
if errLocal != nil {
return errLocal
}
// Write the top block stake node to the database.
errLocal = stake.WriteConnectedBestNode(dbTx, bestStakeNode,
*best.Hash)
if errLocal != nil {
return errLocal
}
// Write the best block node when we reach it.
if i == best.Height {
b.bestNode.stakeNode = bestStakeNode
b.bestNode.stakeUndoData = bestStakeNode.UndoData()
b.bestNode.newTickets = newTickets
b.bestNode.ticketsSpent = ticketsSpentInBlock(block)
b.bestNode.ticketsRevoked = ticketsRevokedInBlock(block)
}
progressLogger.LogBlockHeight(block, parent)
parent = block
}
// Write the new database version.
b.dbInfo.version = 2
errLocal = dbPutDatabaseInfo(dbTx, b.dbInfo)
if errLocal != nil {
return errLocal
}
return nil
})
if err != nil {
return err
}
log.Infof("Upgrade to new stake database was successful!")
return nil
}
// upgrade applies all possible upgrades to the blockchain database iteratively,
// updating old clients to the newest version.
func (b *BlockChain) upgrade() error {
if b.dbInfo.version == 1 {
err := b.upgradeToVersion2()
if err != nil {
return err
}
}
return nil
}