// newKeyValueFromJSONConfig returns a KeyValue implementation on top of a // github.com/syndtr/goleveldb/leveldb file. func newKeyValueFromJSONConfig(cfg jsonconfig.Obj) (sorted.KeyValue, error) { file := cfg.RequiredString("file") if err := cfg.Validate(); err != nil { return nil, err } strictness := opt.DefaultStrict if env.IsDev() { // Be more strict in dev mode. strictness = opt.StrictAll } opts := &opt.Options{ // The default is 10, // 8 means 2.126% or 1/47th disk check rate, // 10 means 0.812% error rate (1/2^(bits/1.44)) or 1/123th disk check rate, // 12 means 0.31% or 1/322th disk check rate. // TODO(tgulacsi): decide which number is the best here. Till that go with the default. Filter: filter.NewBloomFilter(10), Strict: strictness, } db, err := leveldb.OpenFile(file, opts) if err != nil { return nil, err } is := &kvis{ db: db, path: file, opts: opts, readOpts: &opt.ReadOptions{Strict: strictness}, // On machine crash we want to reindex anyway, and // fsyncs may impose great performance penalty. writeOpts: &opt.WriteOptions{Sync: false}, } return is, nil }
func (is *kvis) Wipe() error { // Close the already open DB. if err := is.db.Close(); err != nil { return err } if err := os.RemoveAll(is.path); err != nil { return err } db, err := leveldb.OpenFile(is.path, is.opts) if err != nil { return fmt.Errorf("error creating %s: %v", is.path, err) } is.db = db return nil }