prometheus/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/marshal_proto.go
Goutham Veeramachaneni a1be5db99f
vendor: Update grpc gateway deps
Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
2017-11-30 16:50:34 +05:30

63 lines
1.5 KiB
Go

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