mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rafthttp
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import (
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"encoding/binary"
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"errors"
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"io"
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"github.com/coreos/etcd/pkg/pbutil"
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"github.com/coreos/etcd/raft/raftpb"
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)
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// messageEncoder is a encoder that can encode all kinds of messages.
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// It MUST be used with a paired messageDecoder.
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type messageEncoder struct {
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w io.Writer
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}
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func (enc *messageEncoder) encode(m *raftpb.Message) error {
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if err := binary.Write(enc.w, binary.BigEndian, uint64(m.Size())); err != nil {
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return err
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}
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_, err := enc.w.Write(pbutil.MustMarshal(m))
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return err
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}
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// messageDecoder is a decoder that can decode all kinds of messages.
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type messageDecoder struct {
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r io.Reader
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}
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var (
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readBytesLimit uint64 = 512 * 1024 * 1024 // 512 MB
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ErrExceedSizeLimit = errors.New("rafthttp: error limit exceeded")
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)
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func (dec *messageDecoder) decode() (raftpb.Message, error) {
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return dec.decodeLimit(readBytesLimit)
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}
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func (dec *messageDecoder) decodeLimit(numBytes uint64) (raftpb.Message, error) {
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var m raftpb.Message
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var l uint64
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if err := binary.Read(dec.r, binary.BigEndian, &l); err != nil {
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return m, err
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}
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if l > numBytes {
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return m, ErrExceedSizeLimit
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}
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buf := make([]byte, int(l))
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if _, err := io.ReadFull(dec.r, buf); err != nil {
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return m, err
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}
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return m, m.Unmarshal(buf)
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}
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