mirror of https://github.com/ledisdb/ledisdb.git
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package leveldb
|
|
|
|
// #cgo LDFLAGS: -lleveldb
|
|
// #include <stdint.h>
|
|
// #include "leveldb/c.h"
|
|
import "C"
|
|
|
|
type Snapshot struct {
|
|
db *DB
|
|
|
|
snap *C.leveldb_snapshot_t
|
|
|
|
readOpts *ReadOptions
|
|
iteratorOpts *ReadOptions
|
|
}
|
|
|
|
func (s *Snapshot) Close() {
|
|
C.leveldb_release_snapshot(s.db.db, s.snap)
|
|
|
|
s.iteratorOpts.Close()
|
|
s.readOpts.Close()
|
|
}
|
|
|
|
func (s *Snapshot) Get(key []byte) ([]byte, error) {
|
|
return s.db.get(nil, s.readOpts, key)
|
|
}
|
|
|
|
func (s *Snapshot) BufGet(r []byte, key []byte) ([]byte, error) {
|
|
return s.db.get(r, s.readOpts, key)
|
|
}
|
|
|
|
func (s *Snapshot) NewIterator() *Iterator {
|
|
it := new(Iterator)
|
|
|
|
it.it = C.leveldb_create_iterator(s.db.db, s.iteratorOpts.Opt)
|
|
|
|
return it
|
|
}
|
|
|
|
func (s *Snapshot) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
|
|
return NewRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
|
|
}
|
|
|
|
func (s *Snapshot) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
|
|
return NewRevRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
|
|
}
|
|
|
|
//count < 0, unlimit
|
|
//offset must >= 0, if < 0, will get nothing
|
|
func (s *Snapshot) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
|
|
return NewRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
|
|
}
|
|
|
|
//count < 0, unlimit
|
|
//offset must >= 0, if < 0, will get nothing
|
|
func (s *Snapshot) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
|
|
return NewRevRangeLimitIterator(s.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
|
|
}
|