Golang go-datastore.Key類代碼示例

// ConvertKey returns a B58 encoded Datastore key
// TODO: this is hacky because it encodes every path component. some
// path components may be proper strings already...
func (b58KeyConverter) ConvertKey(dsk ds.Key) ds.Key {
	k := ds.NewKey("/")
	for _, n := range dsk.Namespaces() {
		k = k.ChildString(b58.Encode([]byte(n)))
	}
	return k
}

func (d *Datastore) Get(key ds.Key) (value interface{}, err error) {
	id := d.KeyHash(key)
	res, err := core.Get(false, d.Index(key), key.Type(), id)
	if err != nil {
		return nil, err
	}
	if !res.Ok {
		return nil, fmt.Errorf("Elasticsearch response: NOT OK. %v", res)
	}
	return res.Source, nil
}

// value should be JSON serializable.
func (d *Datastore) Put(key ds.Key, value interface{}) (err error) {
	id := d.KeyHash(key)
	res, err := core.Index(false, d.Index(key), key.Type(), id, value)
	if err != nil {
		return err
	}
	if !res.Ok {
		return fmt.Errorf("Elasticsearch response: NOT OK. %v", res)
	}
	return nil
}

func (d *Datastore) Delete(key ds.Key) (err error) {
	id := d.KeyHash(key)
	res, err := core.Delete(false, d.Index(key), key.Type(), id, 0, "")
	if err != nil {
		return err
	}
	if !res.Ok {
		return fmt.Errorf("Elasticsearch response: NOT OK. %v", res)
	}
	return nil
}

func (ds *Datastore) Put(key datastore.Key, value interface{}) error {
	ds.mu.Lock()
	defer ds.mu.Unlock()

	data, ok := value.([]byte)
	if !ok {
		return ErrInvalidType
	}

	ds.client.Append("SET", key.String(), data)
	if ds.ttl != 0 {
		ds.client.Append("EXPIRE", key.String(), ds.ttl.Seconds())
	}
	if err := ds.client.GetReply().Err; err != nil {
		return fmt.Errorf("failed to put value: %s", err)
	}
	if ds.ttl != 0 {
		if err := ds.client.GetReply().Err; err != nil {
			return fmt.Errorf("failed to set expiration: %s", err)
		}
	}
	return nil
}

// PrefixTransform constructs a KeyTransform with a pair of functions that
// add or remove the given prefix key.
//
// Warning: will panic if prefix not found when it should be there. This is
// to avoid insidious data inconsistency errors.
func PrefixTransform(prefix ds.Key) ktds.KeyTransform {
	return &ktds.Pair{

		// Convert adds the prefix
		Convert: func(k ds.Key) ds.Key {
			return prefix.Child(k)
		},

		// Invert removes the prefix. panics if prefix not found.
		Invert: func(k ds.Key) ds.Key {
			if !prefix.IsAncestorOf(k) {
				fmt.Errorf("Expected prefix (%s) in key (%s)", prefix, k)
				panic("expected prefix not found")
			}

			s := strings.TrimPrefix(k.String(), prefix.String())
			return ds.NewKey(s)
		},
	}
}

func (ds *Datastore) Delete(key datastore.Key) (err error) {
	ds.mu.Lock()
	defer ds.mu.Unlock()
	return ds.client.Cmd("DEL", key.String()).Err
}

func (ds *Datastore) Has(key datastore.Key) (exists bool, err error) {
	ds.mu.Lock()
	defer ds.mu.Unlock()
	return ds.client.Cmd("EXISTS", key.String()).Bool()
}

func (ds *Datastore) Get(key datastore.Key) (value interface{}, err error) {
	ds.mu.Lock()
	defer ds.mu.Unlock()
	return ds.client.Cmd("GET", key.String()).Bytes()
}

// KeyFilename returns the filename associated with `key`
func (d *Datastore) KeyFilename(key ds.Key) string {
	return filepath.Join(d.path, key.String(), ObjectKeySuffix)
}

func (d *Datastore) Has(key ds.Key) (exists bool, err error) {
	id := d.KeyHash(key)
	return core.Exists(false, d.Index(key), key.Type(), id)
}

// Returns the ElasticSearch index for given key. If the datastore specifies
// an index, use that. Else, key.Parent
func (d *Datastore) Index(key ds.Key) string {
	if len(d.index) > 0 {
		return d.index
	}
	return key.Parent().BaseNamespace()
}

// Hash a key and return the first 16 hex chars of its blake2b hash.
// basically: Blake2b(key).HexString[:16]
func BlakeKeyHash(key ds.Key) string {
	h := blake2.NewBlake2B()
	h.Write(key.Bytes())
	d := h.Sum(nil)
	return fmt.Sprintf("%x", d)[:16]
}

// KeyFromDsKey returns a Datastore key
func KeyFromDsKey(dsk ds.Key) Key {
	return Key(dsk.String()[1:])
}