64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
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package runtime
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import (
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"io"
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"errors"
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"io/ioutil"
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"google.golang.org/protobuf/proto"
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)
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// ProtoMarshaller is a Marshaller which marshals/unmarshals into/from serialize proto bytes
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type ProtoMarshaller struct{}
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// ContentType always returns "application/octet-stream".
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func (*ProtoMarshaller) ContentType(_ interface{}) string {
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return "application/octet-stream"
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}
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// Marshal marshals "value" into Proto
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func (*ProtoMarshaller) Marshal(value interface{}) ([]byte, error) {
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message, ok := value.(proto.Message)
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if !ok {
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return nil, errors.New("unable to marshal non proto field")
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}
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return proto.Marshal(message)
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}
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// Unmarshal unmarshals proto "data" into "value"
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func (*ProtoMarshaller) Unmarshal(data []byte, value interface{}) error {
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message, ok := value.(proto.Message)
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if !ok {
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return errors.New("unable to unmarshal non proto field")
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}
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return proto.Unmarshal(data, message)
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}
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// NewDecoder returns a Decoder which reads proto stream from "reader".
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func (marshaller *ProtoMarshaller) NewDecoder(reader io.Reader) Decoder {
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return DecoderFunc(func(value interface{}) error {
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buffer, err := ioutil.ReadAll(reader)
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if err != nil {
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return err
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}
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return marshaller.Unmarshal(buffer, value)
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})
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}
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// NewEncoder returns an Encoder which writes proto stream into "writer".
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func (marshaller *ProtoMarshaller) NewEncoder(writer io.Writer) Encoder {
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return EncoderFunc(func(value interface{}) error {
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buffer, err := marshaller.Marshal(value)
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if err != nil {
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return err
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}
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_, err = writer.Write(buffer)
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if err != nil {
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return err
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}
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return nil
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})
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}
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