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messageslice.go
42 lines (37 loc) · 1.26 KB
/
messageslice.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proto
import (
"bytes"
"github.com/gogo/protobuf/jsonpb"
"github.com/gogo/protobuf/proto"
)
// MessageSlice allows us to marshal slices of protobuf messages like clusters/listeners/routes/endpoints correctly
type MessageSlice []proto.Message
// MarshalJSON handles marshaling of slices of proto messages
func (pSlice MessageSlice) MarshalJSON() ([]byte, error) {
buffer := bytes.NewBufferString("[")
sliceLength := len(pSlice)
jsonm := &jsonpb.Marshaler{}
for index, msg := range pSlice {
if err := jsonm.Marshal(buffer, msg); err != nil {
return nil, err
}
if index < sliceLength-1 {
buffer.WriteString(",")
}
}
buffer.WriteString("]")
return buffer.Bytes(), nil
}