99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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"io"
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"time"
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"github.com/coreos/etcd/etcdserver/stats"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/raft/raftpb"
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)
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// msgAppEncoder is a optimized encoder for append messages. It assumes
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// that the decoder has enough information to recover the fields except
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// Entries, and it writes only Entries into the Writer.
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// It MUST be used with a paired msgAppDecoder.
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type msgAppEncoder struct {
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w io.Writer
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// TODO: move the fs stats and use new metrics
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fs *stats.FollowerStats
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}
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func (enc *msgAppEncoder) encode(m raftpb.Message) error {
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if isLinkHeartbeatMessage(m) {
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return binary.Write(enc.w, binary.BigEndian, uint64(0))
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}
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start := time.Now()
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ents := m.Entries
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l := len(ents)
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// There is no need to send empty ents, and it avoids confusion with
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// heartbeat.
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if l == 0 {
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return nil
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}
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if err := binary.Write(enc.w, binary.BigEndian, uint64(l)); err != nil {
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return err
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}
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for i := 0; i < l; i++ {
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ent := &ents[i]
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if err := writeEntryTo(enc.w, ent); err != nil {
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return err
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}
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}
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enc.fs.Succ(time.Since(start))
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return nil
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}
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// msgAppDecoder is a optimized decoder for append messages. It reads data
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// from the Reader and parses it into Entries, then builds messages.
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type msgAppDecoder struct {
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r io.Reader
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local, remote types.ID
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term uint64
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}
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func (dec *msgAppDecoder) decode() (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 == 0 {
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return linkHeartbeatMessage, nil
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}
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ents := make([]raftpb.Entry, int(l))
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for i := 0; i < int(l); i++ {
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ent := &ents[i]
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if err := readEntryFrom(dec.r, ent); err != nil {
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return m, err
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}
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}
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m = raftpb.Message{
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Type: raftpb.MsgApp,
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From: uint64(dec.remote),
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To: uint64(dec.local),
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Term: dec.term,
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LogTerm: dec.term,
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Index: ents[0].Index - 1,
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Entries: ents,
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}
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return m, nil
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}
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