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goleveldb.go
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goleveldb.go
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package db
import (
"bytes"
"errors"
"fmt"
"path/filepath"
"github.com/spf13/cast"
"github.com/syndtr/goleveldb/leveldb"
dberrors "github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
corestore "cosmossdk.io/core/store"
"cosmossdk.io/store/v2"
storeerrors "cosmossdk.io/store/v2/errors"
)
var _ store.RawDB = (*GoLevelDB)(nil)
// GoLevelDB implements RawDB using github.com/syndtr/goleveldb/leveldb.
// It is used for only store v2 migration, since some clients use goleveldb as
// the IAVL v0/v1 backend.
type GoLevelDB struct {
db *leveldb.DB
}
func NewGoLevelDB(name, dir string, opts store.DBOptions) (*GoLevelDB, error) {
defaultOpts := &opt.Options{
Filter: filter.NewBloomFilter(10), // by default, goleveldb doesn't use a bloom filter.
}
if opts != nil {
files := cast.ToInt(opts.Get("maxopenfiles"))
if files > 0 {
defaultOpts.OpenFilesCacheCapacity = files
}
}
return NewGoLevelDBWithOpts(name, dir, defaultOpts)
}
func NewGoLevelDBWithOpts(name, dir string, o *opt.Options) (*GoLevelDB, error) {
dbPath := filepath.Join(dir, name+DBFileSuffix)
db, err := leveldb.OpenFile(dbPath, o)
if err != nil {
return nil, err
}
return &GoLevelDB{db: db}, nil
}
// Get implements RawDB.
func (db *GoLevelDB) Get(key []byte) ([]byte, error) {
if len(key) == 0 {
return nil, storeerrors.ErrKeyEmpty
}
res, err := db.db.Get(key, nil)
if err != nil {
if errors.Is(err, dberrors.ErrNotFound) {
return nil, nil
}
return nil, err
}
return res, nil
}
// Has implements RawDB.
func (db *GoLevelDB) Has(key []byte) (bool, error) {
return db.db.Has(key, nil)
}
// Set implements RawDB.
func (db *GoLevelDB) Set(key, value []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
if value == nil {
return storeerrors.ErrValueNil
}
return db.db.Put(key, value, nil)
}
// SetSync implements RawDB.
func (db *GoLevelDB) SetSync(key, value []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
if value == nil {
return storeerrors.ErrValueNil
}
return db.db.Put(key, value, &opt.WriteOptions{Sync: true})
}
// Delete implements RawDB.
func (db *GoLevelDB) Delete(key []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
return db.db.Delete(key, nil)
}
// DeleteSync implements RawDB.
func (db *GoLevelDB) DeleteSync(key []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
return db.db.Delete(key, &opt.WriteOptions{Sync: true})
}
func (db *GoLevelDB) RawDB() *leveldb.DB {
return db.db
}
// Close implements RawDB.
func (db *GoLevelDB) Close() error {
return db.db.Close()
}
// Print implements RawDB.
func (db *GoLevelDB) Print() error {
str, err := db.db.GetProperty("leveldb.stats")
if err != nil {
return err
}
fmt.Printf("%v\n", str)
itr := db.db.NewIterator(nil, nil)
for itr.Next() {
key := itr.Key()
value := itr.Value()
fmt.Printf("[%X]:\t[%X]\n", key, value)
}
return nil
}
// Stats implements RawDB.
func (db *GoLevelDB) Stats() map[string]string {
keys := []string{
"leveldb.num-files-at-level{n}",
"leveldb.stats",
"leveldb.sstables",
"leveldb.blockpool",
"leveldb.cachedblock",
"leveldb.openedtables",
"leveldb.alivesnaps",
"leveldb.aliveiters",
}
stats := make(map[string]string)
for _, key := range keys {
if str, err := db.db.GetProperty(key); err == nil {
stats[key] = str
}
}
return stats
}
func (db *GoLevelDB) ForceCompact(start, limit []byte) error {
return db.db.CompactRange(util.Range{Start: start, Limit: limit})
}
// NewBatch implements RawDB.
func (db *GoLevelDB) NewBatch() store.RawBatch {
return newGoLevelDBBatch(db)
}
// NewBatchWithSize implements RawDB.
func (db *GoLevelDB) NewBatchWithSize(size int) store.RawBatch {
return newGoLevelDBBatchWithSize(db, size)
}
// Iterator implements RawDB.
func (db *GoLevelDB) Iterator(start, end []byte) (corestore.Iterator, error) {
if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
return nil, storeerrors.ErrKeyEmpty
}
itr := db.db.NewIterator(&util.Range{Start: start, Limit: end}, nil)
return newGoLevelDBIterator(itr, start, end, false), nil
}
// ReverseIterator implements RawDB.
func (db *GoLevelDB) ReverseIterator(start, end []byte) (corestore.Iterator, error) {
if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
return nil, storeerrors.ErrKeyEmpty
}
itr := db.db.NewIterator(&util.Range{Start: start, Limit: end}, nil)
return newGoLevelDBIterator(itr, start, end, true), nil
}
type goLevelDBIterator struct {
source iterator.Iterator
start []byte
end []byte
isReverse bool
isInvalid bool
}
var _ corestore.Iterator = (*goLevelDBIterator)(nil)
func newGoLevelDBIterator(source iterator.Iterator, start, end []byte, isReverse bool) *goLevelDBIterator {
if isReverse {
if end == nil {
source.Last()
} else {
if source.Seek(end) {
eoakey := source.Key() // end or after key
if bytes.Compare(end, eoakey) <= 0 {
source.Prev()
}
} else {
source.Last()
}
}
} else {
if start == nil {
source.First()
} else {
source.Seek(start)
}
}
return &goLevelDBIterator{
source: source,
start: start,
end: end,
isReverse: isReverse,
isInvalid: false,
}
}
// Domain implements Iterator.
func (itr *goLevelDBIterator) Domain() ([]byte, []byte) {
return itr.start, itr.end
}
// Valid implements Iterator.
func (itr *goLevelDBIterator) Valid() bool {
// Once invalid, forever invalid.
if itr.isInvalid {
return false
}
// If source errors, invalid.
if err := itr.Error(); err != nil {
itr.isInvalid = true
return false
}
// If source is invalid, invalid.
if !itr.source.Valid() {
itr.isInvalid = true
return false
}
// If key is end or past it, invalid.
start := itr.start
end := itr.end
key := itr.source.Key()
if itr.isReverse {
if start != nil && bytes.Compare(key, start) < 0 {
itr.isInvalid = true
return false
}
} else {
if end != nil && bytes.Compare(end, key) <= 0 {
itr.isInvalid = true
return false
}
}
// Valid
return true
}
// Key implements Iterator.
func (itr *goLevelDBIterator) Key() []byte {
// Key returns a copy of the current key.
// See https://github.com/syndtr/goleveldb/blob/52c212e6c196a1404ea59592d3f1c227c9f034b2/leveldb/iterator/iter.go#L88
itr.assertIsValid()
return cp(itr.source.Key())
}
// Value implements Iterator.
func (itr *goLevelDBIterator) Value() []byte {
// Value returns a copy of the current value.
// See https://github.com/syndtr/goleveldb/blob/52c212e6c196a1404ea59592d3f1c227c9f034b2/leveldb/iterator/iter.go#L88
itr.assertIsValid()
return cp(itr.source.Value())
}
// Next implements Iterator.
func (itr *goLevelDBIterator) Next() {
itr.assertIsValid()
if itr.isReverse {
itr.source.Prev()
} else {
itr.source.Next()
}
}
// Error implements Iterator.
func (itr *goLevelDBIterator) Error() error {
return itr.source.Error()
}
// Close implements Iterator.
func (itr *goLevelDBIterator) Close() error {
itr.source.Release()
return nil
}
func (itr goLevelDBIterator) assertIsValid() {
if !itr.Valid() {
panic("iterator is invalid")
}
}
type goLevelDBBatch struct {
db *GoLevelDB
batch *leveldb.Batch
}
var _ store.RawBatch = (*goLevelDBBatch)(nil)
func newGoLevelDBBatch(db *GoLevelDB) *goLevelDBBatch {
return &goLevelDBBatch{
db: db,
batch: new(leveldb.Batch),
}
}
func newGoLevelDBBatchWithSize(db *GoLevelDB, size int) *goLevelDBBatch {
return &goLevelDBBatch{
db: db,
batch: leveldb.MakeBatch(size),
}
}
// Set implements RawBatch.
func (b *goLevelDBBatch) Set(key, value []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
if value == nil {
return storeerrors.ErrValueNil
}
if b.batch == nil {
return storeerrors.ErrBatchClosed
}
b.batch.Put(key, value)
return nil
}
// Delete implements RawBatch.
func (b *goLevelDBBatch) Delete(key []byte) error {
if len(key) == 0 {
return storeerrors.ErrKeyEmpty
}
if b.batch == nil {
return storeerrors.ErrBatchClosed
}
b.batch.Delete(key)
return nil
}
// Write implements RawBatch.
func (b *goLevelDBBatch) Write() error {
return b.write(false)
}
// WriteSync implements RawBatch.
func (b *goLevelDBBatch) WriteSync() error {
return b.write(true)
}
func (b *goLevelDBBatch) write(sync bool) error {
if b.batch == nil {
return storeerrors.ErrBatchClosed
}
if err := b.db.db.Write(b.batch, &opt.WriteOptions{Sync: sync}); err != nil {
return err
}
// Make sure batch cannot be used afterwards. Callers should still call Close(), for errors.
return b.Close()
}
// Close implements RawBatch.
func (b *goLevelDBBatch) Close() error {
if b.batch != nil {
b.batch.Reset()
b.batch = nil
}
return nil
}
// GetByteSize implements RawBatch
func (b *goLevelDBBatch) GetByteSize() (int, error) {
if b.batch == nil {
return 0, storeerrors.ErrBatchClosed
}
return len(b.batch.Dump()), nil
}