// Copyright 2015 CoreOS, Inc.
//
// 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 snap

import (
	"io"

	"github.com/coreos/etcd/raft/raftpb"
)

// Message is a struct that contains a raft Message and a ReadCloser. The type
// of raft message MUST be MsgSnap, which contains the raft meta-data and an
// additional data []byte field that contains the snapshot of the actual state
// machine.
// Message contains the ReadCloser field for handling large snapshot. This avoid
// copying the entire snapshot into a byte array, which consumes a lot of memory.
//
// User of Message should close the ReadCloser after sending it.
type Message struct {
	raftpb.Message
	ReadCloser io.ReadCloser
}