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openStorage.go
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openStorage.go
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package factory
import (
"fmt"
"path/filepath"
"time"
"github.com/ElrondNetwork/elrond-go/common"
"github.com/ElrondNetwork/elrond-go/config"
"github.com/ElrondNetwork/elrond-go/process/block/bootstrapStorage"
"github.com/ElrondNetwork/elrond-go/storage"
"github.com/ElrondNetwork/elrond-go/storage/lrucache"
"github.com/ElrondNetwork/elrond-go/storage/storageUnit"
)
const cacheSize = 10
// ArgsNewOpenStorageUnits defines the arguments in order to open a set of storage units from disk
type ArgsNewOpenStorageUnits struct {
BootstrapDataProvider BootstrapDataProviderHandler
LatestStorageDataProvider storage.LatestStorageDataProviderHandler
DefaultEpochString string
DefaultShardString string
}
type openStorageUnits struct {
bootstrapDataProvider BootstrapDataProviderHandler
latestStorageDataProvider storage.LatestStorageDataProviderHandler
defaultEpochString string
defaultShardString string
}
// NewStorageUnitOpenHandler creates an openStorageUnits component
func NewStorageUnitOpenHandler(args ArgsNewOpenStorageUnits) (*openStorageUnits, error) {
o := &openStorageUnits{
defaultEpochString: args.DefaultEpochString,
defaultShardString: args.DefaultShardString,
bootstrapDataProvider: args.BootstrapDataProvider,
latestStorageDataProvider: args.LatestStorageDataProvider,
}
return o, nil
}
// GetMostRecentStorageUnit will open bootstrap storage unit
func (o *openStorageUnits) GetMostRecentStorageUnit(dbConfig config.DBConfig) (storage.Storer, error) {
parentDir, lastEpoch, err := o.latestStorageDataProvider.GetParentDirAndLastEpoch()
if err != nil {
return nil, err
}
persisterFactory := NewPersisterFactory(dbConfig)
pathWithoutShard := o.getPathWithoutShard(parentDir, lastEpoch)
shardIdsStr, err := o.latestStorageDataProvider.GetShardsFromDirectory(pathWithoutShard)
if err != nil {
return nil, err
}
mostRecentShard, err := o.getMostUpToDateDirectory(dbConfig, pathWithoutShard, shardIdsStr, persisterFactory)
if err != nil {
return nil, err
}
persisterPath := o.getPersisterPath(pathWithoutShard, mostRecentShard, dbConfig)
persister, err := createDB(persisterFactory, persisterPath)
if err != nil {
return nil, err
}
cacher, err := lrucache.NewCache(cacheSize)
if err != nil {
return nil, err
}
storer, err := storageUnit.NewStorageUnit(cacher, persister)
if err != nil {
return nil, err
}
return storer, nil
}
func (o *openStorageUnits) getPathWithoutShard(parentDir string, epoch uint32) string {
return filepath.Join(
parentDir,
fmt.Sprintf("%s_%d", o.defaultEpochString, epoch),
)
}
func (o *openStorageUnits) getPersisterPath(pathWithoutShard string, shardID string, dbConfig config.DBConfig) string {
return filepath.Join(
pathWithoutShard,
fmt.Sprintf("%s_%s", o.defaultShardString, shardID),
dbConfig.FilePath,
)
}
// OpenDB opens or creates a given DB
func (o *openStorageUnits) OpenDB(dbConfig config.DBConfig, shardID uint32, epoch uint32) (storage.Storer, error) {
parentDir := o.latestStorageDataProvider.GetParentDirectory()
pathWithoutShard := o.getPathWithoutShard(parentDir, epoch)
persisterPath := o.getPersisterPath(pathWithoutShard, fmt.Sprintf("%d", shardID), dbConfig)
persisterFactory := NewPersisterFactory(dbConfig)
persister, err := createDB(persisterFactory, persisterPath)
if err != nil {
return nil, err
}
cache, err := lrucache.NewCache(cacheSize)
if err != nil {
return nil, err
}
return storageUnit.NewStorageUnit(cache, persister)
}
func createDB(persisterFactory *PersisterFactory, persisterPath string) (storage.Persister, error) {
var persister storage.Persister
var err error
for i := 0; i < common.MaxRetriesToCreateDB; i++ {
persister, err = persisterFactory.Create(persisterPath)
if err == nil {
return persister, nil
}
log.Warn("Create Persister failed", "path", persisterPath, "error", err)
//TODO: extract this in a parameter and inject it
time.Sleep(common.SleepTimeBetweenCreateDBRetries)
}
return nil, err
}
func (o *openStorageUnits) getMostUpToDateDirectory(
dbConfig config.DBConfig,
pathWithoutShard string,
shardIdsStr []string,
persisterFactory storage.PersisterFactory,
) (string, error) {
var mostRecentShard string
highestRoundInStoredShards := int64(0)
for _, shardIdStr := range shardIdsStr {
persisterPath := filepath.Join(
pathWithoutShard,
fmt.Sprintf("%s_%s", o.defaultShardString, shardIdStr),
dbConfig.FilePath,
)
bootstrapData, errGet := o.loadBootstrapDataForShard(persisterFactory, persisterPath)
if errGet != nil {
continue
}
if bootstrapData.LastRound > highestRoundInStoredShards {
highestRoundInStoredShards = bootstrapData.LastRound
mostRecentShard = shardIdStr
}
}
if len(mostRecentShard) == 0 {
return "", storage.ErrBootstrapDataNotFoundInStorage
}
return mostRecentShard, nil
}
func (o *openStorageUnits) loadBootstrapDataForShard(
persisterFactory storage.PersisterFactory,
persisterPath string,
) (*bootstrapStorage.BootstrapData, error) {
bootstrapData, storer, err := o.bootstrapDataProvider.LoadForPath(persisterFactory, persisterPath)
defer func() {
if storer != nil {
errClose := storer.Close()
if errClose != nil {
log.Debug("openStorageunits: error closing storer",
"persister path", persisterPath,
"error", errClose)
}
}
}()
return bootstrapData, err
}
// IsInterfaceNil returns true if there is no value under the interface
func (o *openStorageUnits) IsInterfaceNil() bool {
return o == nil
}