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store.go
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store.go
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package local
import (
"bytes"
"context"
"errors"
"time"
"github.com/dgraph-io/badger/v3"
"github.com/treeverse/lakefs/pkg/kv"
"github.com/treeverse/lakefs/pkg/logging"
)
func partitionRange(partitionKey []byte) []byte {
result := make([]byte, len(partitionKey)+1)
copy(result, partitionKey)
result[len(result)-1] = kv.PathDelimiter[0]
return result
}
func composeKey(partitionKey, key []byte) []byte {
pr := partitionRange(partitionKey)
result := make([]byte, len(pr)+len(key))
copy(result, pr)
copy(result[len(pr):], key)
return result
}
type Store struct {
db *badger.DB
logger logging.Logger
prefetchSize int
refCount int
path string
}
func (s *Store) Get(ctx context.Context, partitionKey, key []byte) (*kv.ValueWithPredicate, error) {
k := composeKey(partitionKey, key)
start := time.Now()
log := s.logger.WithField("key", string(k)).WithField("op", "get").WithContext(ctx)
log.Trace("performing operation")
if len(partitionKey) == 0 {
log.WithError(kv.ErrMissingPartitionKey).Warn("got empty partition key")
return nil, kv.ErrMissingPartitionKey
}
if len(key) == 0 {
log.WithError(kv.ErrMissingKey).Warn("got empty key")
return nil, kv.ErrMissingKey
}
var value []byte
err := s.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(k)
if errors.Is(err, badger.ErrKeyNotFound) {
return kv.ErrNotFound
}
if err != nil {
log.WithError(err).Error("error getting key")
return err
}
value, err = item.ValueCopy(nil)
if err != nil {
log.WithError(err).Error("error getting value for key")
return err
}
return nil
})
log.WithField("took", time.Since(start)).WithError(err).WithField("size", len(value)).Trace("operation complete")
if err != nil {
return nil, err
}
return &kv.ValueWithPredicate{
Value: value,
Predicate: kv.Predicate(value),
}, nil
}
func (s *Store) Set(ctx context.Context, partitionKey, key, value []byte) error {
k := composeKey(partitionKey, key)
start := time.Now()
log := s.logger.WithField("key", string(k)).WithField("op", "set").WithContext(ctx)
log.Trace("performing operation")
if len(partitionKey) == 0 {
log.WithError(kv.ErrMissingPartitionKey).Warn("got empty partition key")
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
log.WithError(kv.ErrMissingKey).Warn("got empty key")
return kv.ErrMissingKey
}
if value == nil {
log.WithError(kv.ErrMissingValue).Warn("got nil value")
return kv.ErrMissingValue
}
err := s.db.Update(func(txn *badger.Txn) error {
return txn.Set(k, value)
})
if err != nil {
log.WithError(err).Error("error setting value")
return err
}
log.WithField("took", time.Since(start)).Trace("done setting value")
return nil
}
func (s *Store) SetIf(ctx context.Context, partitionKey, key, value []byte, valuePredicate kv.Predicate) error {
k := composeKey(partitionKey, key)
start := time.Now()
log := s.logger.WithField("key", string(k)).WithField("op", "set_if").WithContext(ctx)
log.Trace("performing operation")
if len(partitionKey) == 0 {
log.WithError(kv.ErrMissingPartitionKey).Warn("got empty partition key")
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
log.WithError(kv.ErrMissingKey).Warn("got empty key")
return kv.ErrMissingKey
}
if value == nil {
log.WithError(kv.ErrMissingValue).Warn("got nil value")
return kv.ErrMissingValue
}
err := s.db.Update(func(txn *badger.Txn) error {
item, err := txn.Get(k)
if err != nil && !errors.Is(err, badger.ErrKeyNotFound) {
log.WithError(err).Error("could not get key for predicate")
return err
}
if valuePredicate != nil {
if errors.Is(err, badger.ErrKeyNotFound) {
log.WithField("predicate", nil).Trace("predicate condition failed")
return kv.ErrPredicateFailed
}
if valuePredicate != kv.PrecondConditionalExists {
val, err := item.ValueCopy(nil)
if err != nil {
log.WithError(err).Error("could not get byte value for predicate")
return err
}
if !bytes.Equal(val, valuePredicate.([]byte)) {
log.WithField("predicate", valuePredicate).WithField("value", val).Trace("predicate condition failed")
return kv.ErrPredicateFailed
}
}
} else if !errors.Is(err, badger.ErrKeyNotFound) {
log.WithField("predicate", valuePredicate).Trace("predicate condition failed (key not found)")
return kv.ErrPredicateFailed
}
return txn.Set(k, value)
})
if errors.Is(err, badger.ErrConflict) { // Return predicate failed on transaction conflict - to retry
log.WithError(err).Trace("transaction conflict")
err = kv.ErrPredicateFailed
}
took := time.Since(start)
log.WithField("took", took).Trace("operation complete")
return err
}
func (s *Store) Delete(ctx context.Context, partitionKey, key []byte) error {
k := composeKey(partitionKey, key)
start := time.Now()
log := s.logger.
WithField("key", string(k)).
WithField("op", "delete").
WithContext(ctx)
log.Trace("performing operation")
if len(partitionKey) == 0 {
log.WithError(kv.ErrMissingPartitionKey).Warn("got empty partition key")
return kv.ErrMissingPartitionKey
}
if len(key) == 0 {
log.WithError(kv.ErrMissingKey).Warn("got empty key")
return kv.ErrMissingKey
}
err := s.db.Update(func(txn *badger.Txn) error {
return txn.Delete(k)
})
took := time.Since(start)
log = log.WithField("took", took)
if err != nil {
log.WithError(err).Trace("operation failed")
return err
}
log.Trace("operation complete")
return nil
}
func (s *Store) Scan(ctx context.Context, partitionKey []byte, options kv.ScanOptions) (kv.EntriesIterator, error) {
log := s.logger.WithFields(logging.Fields{
"partition_key": string(partitionKey),
"start_key": string(options.KeyStart),
"op": "scan",
}).WithContext(ctx)
log.Trace("performing operation")
if len(partitionKey) == 0 {
log.WithError(kv.ErrMissingPartitionKey).Warn("got empty partition key")
return nil, kv.ErrMissingPartitionKey
}
prefix := partitionRange(partitionKey)
txn := s.db.NewTransaction(false)
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = s.prefetchSize
if options.BatchSize != 0 && opts.PrefetchSize != 0 && options.BatchSize < opts.PrefetchSize {
opts.PrefetchSize = options.BatchSize
}
if opts.PrefetchSize > 0 {
opts.PrefetchValues = true
}
opts.Prefix = prefix
iter := txn.NewIterator(opts)
return &EntriesIterator{
iter: iter,
partitionKey: partitionKey,
start: composeKey(partitionKey, options.KeyStart),
logger: log,
txn: txn,
}, nil
}
func (s *Store) Close() {
driverLock.Lock()
defer driverLock.Unlock()
s.refCount--
if s.refCount <= 0 {
_ = s.db.Close()
delete(dbMap, s.path)
}
}