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datastore.go
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/
datastore.go
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package leveldb
import (
"io"
ds "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore"
"github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb"
"github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/opt"
)
type Datastore interface {
ds.ThreadSafeDatastore
io.Closer
}
type datastore struct {
DB *leveldb.DB
}
type Options opt.Options
func NewDatastore(path string, opts *Options) (Datastore, error) {
var nopts opt.Options
if opts != nil {
nopts = opt.Options(*opts)
}
db, err := leveldb.OpenFile(path, &nopts)
if err != nil {
return nil, err
}
return &datastore{
DB: db,
}, nil
}
// Returns ErrInvalidType if value is not of type []byte.
//
// Note: using sync = false.
// see http://godoc.org/github.com/syndtr/goleveldb/leveldb/opt#WriteOptions
func (d *datastore) Put(key ds.Key, value interface{}) (err error) {
val, ok := value.([]byte)
if !ok {
return ds.ErrInvalidType
}
return d.DB.Put(key.Bytes(), val, nil)
}
func (d *datastore) Get(key ds.Key) (value interface{}, err error) {
val, err := d.DB.Get(key.Bytes(), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return nil, ds.ErrNotFound
}
return nil, err
}
return val, nil
}
func (d *datastore) Has(key ds.Key) (exists bool, err error) {
return ds.GetBackedHas(d, key)
}
func (d *datastore) Delete(key ds.Key) (err error) {
err = d.DB.Delete(key.Bytes(), nil)
if err == leveldb.ErrNotFound {
return ds.ErrNotFound
}
return err
}
func (d *datastore) KeyList() ([]ds.Key, error) {
i := d.DB.NewIterator(nil, nil)
var keys []ds.Key
for i.Next() {
keys = append(keys, ds.NewKey(string(i.Key())))
}
return keys, nil
}
// LevelDB needs to be closed.
func (d *datastore) Close() (err error) {
return d.DB.Close()
}
func (d *datastore) IsThreadSafe() {}