frostfs-node/pkg/local_object_storage/metabase/control.go

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package meta
import (
"context"
"errors"
"fmt"
"path/filepath"
"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
"go.etcd.io/bbolt"
"go.uber.org/zap"
)
// ErrDegradedMode is returned when metabase is in a degraded mode.
var ErrDegradedMode = logicerr.New("metabase is in a degraded mode")
// ErrReadOnlyMode is returned when metabase is in a read-only mode.
var ErrReadOnlyMode = logicerr.New("metabase is in a read-only mode")
// Open boltDB instance for metabase.
func (db *DB) Open(_ context.Context, readOnly bool) error {
err := util.MkdirAllX(filepath.Dir(db.info.Path), db.info.Permission)
if err != nil {
return fmt.Errorf("can't create dir %s for metabase: %w", db.info.Path, err)
}
db.log.Debug(logs.MetabaseCreatedDirectoryForMetabase, zap.String("path", db.info.Path))
if db.boltOptions == nil {
opts := *bbolt.DefaultOptions
db.boltOptions = &opts
}
db.boltOptions.ReadOnly = readOnly
return metaerr.Wrap(db.openBolt())
}
func (db *DB) openBolt() error {
var err error
db.boltDB, err = bbolt.Open(db.info.Path, db.info.Permission, db.boltOptions)
if err != nil {
return fmt.Errorf("can't open boltDB database: %w", err)
}
db.boltDB.MaxBatchDelay = db.boltBatchDelay
db.boltDB.MaxBatchSize = db.boltBatchSize
db.log.Debug(logs.MetabaseOpenedBoltDBInstanceForMetabase)
db.log.Debug(logs.MetabaseCheckingMetabaseVersion)
return db.boltDB.View(func(tx *bbolt.Tx) error {
// The safest way to check if the metabase is fresh is to check if it has no buckets.
// However, shard info can be present. So here we check that the number of buckets is
// at most 1.
// Another thing to consider is that tests do not persist shard ID, we want to support
// this case too.
var n int
err := tx.ForEach(func([]byte, *bbolt.Bucket) error {
if n++; n >= 2 { // do not iterate a lot
return errBreakBucketForEach
}
return nil
})
if err == errBreakBucketForEach {
db.initialized = true
err = nil
}
return err
})
}
// Init initializes metabase. It creates static (CID-independent) buckets in underlying BoltDB instance.
//
// Returns ErrOutdatedVersion if a database at the provided path is outdated.
//
// Does nothing if metabase has already been initialized and filled. To roll back the database to its initial state,
// use Reset.
func (db *DB) Init() error {
return metaerr.Wrap(db.init(false))
}
// Reset resets metabase. Works similar to Init but cleans up all static buckets and
// removes all dynamic (CID-dependent) ones in non-blank BoltDB instances.
func (db *DB) Reset() error {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return ErrDegradedMode
}
return metaerr.Wrap(db.init(true))
}
func (db *DB) init(reset bool) error {
if db.mode.NoMetabase() || db.mode.ReadOnly() {
return nil
}
mStaticBuckets := map[string]struct{}{
string(containerVolumeBucketName): {},
string(graveyardBucketName): {},
string(toMoveItBucketName): {},
string(garbageBucketName): {},
string(shardInfoBucket): {},
string(bucketNameLocked): {},
}
return db.boltDB.Update(func(tx *bbolt.Tx) error {
var err error
if !reset {
// Normal open, check version and update if not initialized.
err := checkVersion(tx, db.initialized)
if err != nil {
return err
}
}
for k := range mStaticBuckets {
name := []byte(k)
if reset {
err := tx.DeleteBucket(name)
if err != nil && !errors.Is(err, bbolt.ErrBucketNotFound) {
return fmt.Errorf("could not delete static bucket %s: %w", k, err)
}
}
_, err := tx.CreateBucketIfNotExists(name)
if err != nil {
return fmt.Errorf("could not create static bucket %s: %w", k, err)
}
}
if !reset {
err = syncCounter(tx, false)
if err != nil {
return fmt.Errorf("could not sync object counter: %w", err)
}
return nil
}
err = tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
if _, ok := mStaticBuckets[string(name)]; !ok {
return tx.DeleteBucket(name)
}
return nil
})
if err != nil {
return err
}
return updateVersion(tx, version)
})
}
// SyncCounters forces to synchronize the object counters.
func (db *DB) SyncCounters() error {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return ErrDegradedMode
} else if db.mode.ReadOnly() {
return ErrReadOnlyMode
}
return metaerr.Wrap(db.boltDB.Update(func(tx *bbolt.Tx) error {
return syncCounter(tx, true)
}))
}
// Close closes boltDB instance.
func (db *DB) Close() error {
var err error
if db.boltDB != nil {
err = metaerr.Wrap(db.boltDB.Close())
}
if err == nil {
db.metrics.Close()
}
return err
}
// Reload reloads part of the configuration.
// It returns true iff database was reopened.
// If a config option is invalid, it logs an error and returns nil.
// If there was a problem with applying new configuration, an error is returned.
//
// If a metabase was couldn't be reopened because of an error, ErrDegradedMode is returned.
func (db *DB) Reload(opts ...Option) (bool, error) {
var c cfg
for i := range opts {
opts[i](&c)
}
db.modeMtx.Lock()
defer db.modeMtx.Unlock()
if db.mode.NoMetabase() || c.info.Path != "" && filepath.Clean(db.info.Path) != filepath.Clean(c.info.Path) {
if err := db.Close(); err != nil {
return false, err
}
db.mode = mode.Degraded
db.metrics.SetMode(mode.Degraded)
db.info.Path = c.info.Path
if err := db.openBolt(); err != nil {
return false, metaerr.Wrap(fmt.Errorf("%w: %v", ErrDegradedMode, err))
}
db.mode = mode.ReadWrite
db.metrics.SetMode(mode.ReadWrite)
return true, nil
}
return false, nil
}