func propertiesToProto(key *Key, props []Property) (*pb.Entity, error) {
e := &pb.Entity{
Key: keyToProto(key),
}
indexedProps := 0
prevMultiple := make(map[string]*pb.Property)
for _, p := range props {
val, err := interfaceToProto(p.Value)
if err != "" {
return nil, fmt.Errorf("datastore: %s for a Property with Name %q", err, p.Name)
}
if !p.NoIndex {
rVal := reflect.ValueOf(p.Value)
if rVal.Kind() == reflect.Slice && rVal.Type().Elem().Kind() != reflect.Uint8 {
indexedProps += rVal.Len()
} else {
indexedProps++
}
}
if indexedProps > maxIndexedProperties {
return nil, errors.New("datastore: too many indexed properties")
}
switch v := p.Value.(type) {
case string:
case []byte:
if len(v) > 500 && !p.NoIndex {
return nil, fmt.Errorf("datastore: cannot index a Property with Name %q", p.Name)
}
}
val.Indexed = proto.Bool(!p.NoIndex)
if p.Multiple {
x, ok := prevMultiple[p.Name]
if !ok {
x = &pb.Property{
Name: proto.String(p.Name),
Value: &pb.Value{},
}
prevMultiple[p.Name] = x
e.Property = append(e.Property, x)
}
x.Value.ListValue = append(x.Value.ListValue, val)
} else {
e.Property = append(e.Property, &pb.Property{
Name: proto.String(p.Name),
Value: val,
})
}
}
return e, nil
}
func interfaceToProto(iv interface{}) (p *pb.Value, errStr string) {
val := new(pb.Value)
switch v := iv.(type) {
case int:
val.IntegerValue = proto.Int64(int64(v))
case int32:
val.IntegerValue = proto.Int64(int64(v))
case int64:
val.IntegerValue = proto.Int64(v)
case bool:
val.BooleanValue = proto.Bool(v)
case string:
val.StringValue = proto.String(v)
case float32:
val.DoubleValue = proto.Float64(float64(v))
case float64:
val.DoubleValue = proto.Float64(v)
case *Key:
if v != nil {
val.KeyValue = keyToProto(v)
}
case time.Time:
if v.Before(minTime) || v.After(maxTime) {
return nil, fmt.Sprintf("time value out of range")
}
val.TimestampMicrosecondsValue = proto.Int64(toUnixMicro(v))
case []byte:
val.BlobValue = v
default:
if iv != nil {
return nil, fmt.Sprintf("invalid Value type %t", iv)
}
}
// TODO(jbd): Support ListValue and EntityValue.
// TODO(jbd): Support types whose underlying type is one of the types above.
return val, ""
}