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domain.go
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domain.go
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package domain
import (
"sync"
"sync/atomic"
"unsafe"
"github.com/kaspanet/kaspad/domain/consensusreference"
"github.com/kaspanet/kaspad/domain/consensus"
"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
"github.com/kaspanet/kaspad/domain/miningmanager"
"github.com/kaspanet/kaspad/domain/miningmanager/mempool"
"github.com/kaspanet/kaspad/domain/prefixmanager"
"github.com/kaspanet/kaspad/domain/prefixmanager/prefix"
infrastructuredatabase "github.com/kaspanet/kaspad/infrastructure/db/database"
"github.com/pkg/errors"
)
// Domain provides a reference to the domain's external aps
type Domain interface {
MiningManager() miningmanager.MiningManager
Consensus() externalapi.Consensus
StagingConsensus() externalapi.Consensus
InitStagingConsensusWithoutGenesis() error
CommitStagingConsensus() error
DeleteStagingConsensus() error
ConsensusEventsChannel() chan externalapi.ConsensusEvent
}
type domain struct {
miningManager miningmanager.MiningManager
consensus *externalapi.Consensus
stagingConsensus *externalapi.Consensus
stagingConsensusLock sync.RWMutex
consensusConfig *consensus.Config
db infrastructuredatabase.Database
consensusEventsChannel chan externalapi.ConsensusEvent
}
func (d *domain) ConsensusEventsChannel() chan externalapi.ConsensusEvent {
return d.consensusEventsChannel
}
func (d *domain) Consensus() externalapi.Consensus {
return *d.consensus
}
func (d *domain) StagingConsensus() externalapi.Consensus {
d.stagingConsensusLock.RLock()
defer d.stagingConsensusLock.RUnlock()
return *d.stagingConsensus
}
func (d *domain) MiningManager() miningmanager.MiningManager {
return d.miningManager
}
func (d *domain) InitStagingConsensusWithoutGenesis() error {
cfg := *d.consensusConfig
cfg.SkipAddingGenesis = true
return d.initStagingConsensus(&cfg)
}
func (d *domain) initStagingConsensus(cfg *consensus.Config) error {
d.stagingConsensusLock.Lock()
defer d.stagingConsensusLock.Unlock()
_, hasInactivePrefix, err := prefixmanager.InactivePrefix(d.db)
if err != nil {
return err
}
if hasInactivePrefix {
return errors.Errorf("cannot create staging consensus when a staging consensus already exists")
}
activePrefix, exists, err := prefixmanager.ActivePrefix(d.db)
if err != nil {
return err
}
if !exists {
return errors.Errorf("cannot create a staging consensus when there's " +
"no active consensus")
}
inactivePrefix := activePrefix.Flip()
err = prefixmanager.SetPrefixAsInactive(d.db, inactivePrefix)
if err != nil {
return err
}
consensusFactory := consensus.NewFactory()
consensusInstance, shouldMigrate, err := consensusFactory.NewConsensus(cfg, d.db, inactivePrefix, d.consensusEventsChannel)
if err != nil {
return err
}
if shouldMigrate {
return errors.Errorf("A fresh consensus should never return shouldMigrate=true")
}
d.stagingConsensus = &consensusInstance
return nil
}
func (d *domain) CommitStagingConsensus() error {
d.stagingConsensusLock.Lock()
defer d.stagingConsensusLock.Unlock()
dbTx, err := d.db.Begin()
if err != nil {
return err
}
defer dbTx.RollbackUnlessClosed()
inactivePrefix, hasInactivePrefix, err := prefixmanager.InactivePrefix(d.db)
if err != nil {
return err
}
if !hasInactivePrefix {
return errors.Errorf("there's no inactive prefix to commit")
}
activePrefix, exists, err := prefixmanager.ActivePrefix(dbTx)
if err != nil {
return err
}
if !exists {
return errors.Errorf("cannot commit a staging consensus when there's " +
"no active consensus")
}
err = prefixmanager.SetPrefixAsActive(dbTx, inactivePrefix)
if err != nil {
return err
}
err = prefixmanager.SetPrefixAsInactive(dbTx, activePrefix)
if err != nil {
return err
}
err = dbTx.Commit()
if err != nil {
return err
}
// We delete anything associated with the old prefix outside
// of the transaction in order to save memory.
err = prefixmanager.DeleteInactivePrefix(d.db)
if err != nil {
return err
}
tempConsensusPointer := unsafe.Pointer(d.stagingConsensus)
consensusPointer := (*unsafe.Pointer)(unsafe.Pointer(&d.consensus))
atomic.StorePointer(consensusPointer, tempConsensusPointer)
d.stagingConsensus = nil
return nil
}
func (d *domain) DeleteStagingConsensus() error {
d.stagingConsensusLock.Lock()
defer d.stagingConsensusLock.Unlock()
err := prefixmanager.DeleteInactivePrefix(d.db)
if err != nil {
return err
}
d.stagingConsensus = nil
return nil
}
// New instantiates a new instance of a Domain object
func New(consensusConfig *consensus.Config, mempoolConfig *mempool.Config, db infrastructuredatabase.Database) (Domain, error) {
err := prefixmanager.DeleteInactivePrefix(db)
if err != nil {
return nil, err
}
activePrefix, exists, err := prefixmanager.ActivePrefix(db)
if err != nil {
return nil, err
}
if !exists {
activePrefix = &prefix.Prefix{}
err = prefixmanager.SetPrefixAsActive(db, activePrefix)
if err != nil {
return nil, err
}
}
consensusEventsChan := make(chan externalapi.ConsensusEvent, 100e3)
consensusFactory := consensus.NewFactory()
consensusInstance, shouldMigrate, err := consensusFactory.NewConsensus(consensusConfig, db, activePrefix, consensusEventsChan)
if err != nil {
return nil, err
}
domainInstance := &domain{
consensus: &consensusInstance,
consensusConfig: consensusConfig,
db: db,
consensusEventsChannel: consensusEventsChan,
}
if shouldMigrate {
err := domainInstance.migrate()
if err != nil {
return nil, err
}
}
miningManagerFactory := miningmanager.NewFactory()
// We create a consensus wrapper because the actual consensus might change
consensusReference := consensusreference.NewConsensusReference(&domainInstance.consensus)
domainInstance.miningManager = miningManagerFactory.NewMiningManager(consensusReference, &consensusConfig.Params, mempoolConfig)
return domainInstance, nil
}