示例#1
0
// WriteKey encodes a key to the buffer. If context is WithContext, then this
// encoded value will include the appid and namespace of the key.
func WriteKey(buf Buffer, context KeyContext, k *ds.Key) (err error) {
	// [appid ++ namespace]? ++ [1 ++ token]* ++ NULL
	defer recoverTo(&err)
	appid, namespace, toks := k.Split()
	if context == WithContext {
		panicIf(buf.WriteByte(1))
		_, e := cmpbin.WriteString(buf, appid)
		panicIf(e)
		_, e = cmpbin.WriteString(buf, namespace)
		panicIf(e)
	} else {
		panicIf(buf.WriteByte(0))
	}
	for _, tok := range toks {
		panicIf(buf.WriteByte(1))
		panicIf(WriteKeyTok(buf, tok))
	}
	return buf.WriteByte(0)
}
示例#2
0
// dsF2R (DS fake-to-real) converts a DSKey back to an SDK *Key.
func dsF2R(aeCtx context.Context, k *ds.Key) (*datastore.Key, error) {
	if k == nil {
		return nil, nil
	}

	// drop aid.
	_, ns, toks := k.Split()
	err := error(nil)
	aeCtx, err = appengine.Namespace(aeCtx, ns)
	if err != nil {
		return nil, err
	}

	ret := datastore.NewKey(aeCtx, toks[0].Kind, toks[0].StringID, toks[0].IntID, nil)
	for _, t := range toks[1:] {
		ret = datastore.NewKey(aeCtx, t.Kind, t.StringID, t.IntID, ret)
	}

	return ret, nil
}