// 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 rafthttp

import (
	"encoding/binary"
	"io"

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

func writeEntryTo(w io.Writer, ent *raftpb.Entry) error {
	size := ent.Size()
	if err := binary.Write(w, binary.BigEndian, uint64(size)); err != nil {
		return err
	}
	b, err := ent.Marshal()
	if err != nil {
		return err
	}
	_, err = w.Write(b)
	return err
}

func readEntryFrom(r io.Reader, ent *raftpb.Entry) error {
	var l uint64
	if err := binary.Read(r, binary.BigEndian, &l); err != nil {
		return err
	}
	buf := make([]byte, int(l))
	if _, err := io.ReadFull(r, buf); err != nil {
		return err
	}
	return ent.Unmarshal(buf)
}