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213 lines
5.4 KiB
213 lines
5.4 KiB
package nodes
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import (
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"errors"
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"fmt"
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"net"
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"net/http"
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"net/rpc"
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"simple-kv-store/internal/logprovider"
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"time"
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"github.com/syndtr/goleveldb/leveldb"
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"go.uber.org/zap"
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)
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var log, _ = logprovider.CreateDefaultZapLogger(zap.InfoLevel)
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// 运行在进程上的初始化 + rpc注册
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func InitRPCNode(SelfId string, port string, nodeAddr map[string]string, db *leveldb.DB, rstorage *RaftStorage, isRestart bool) *Node {
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var nodeIds []string
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for id := range nodeAddr {
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nodeIds = append(nodeIds, id)
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}
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// 创建节点
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node := &Node{
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SelfId: SelfId,
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LeaderId: "",
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Nodes: nodeIds,
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MaxLogId: -1, // 后来发现论文中是从1开始的（初始0），但不想改了
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CurrTerm: 1,
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Log: make([]RaftLogEntry, 0),
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CommitIndex: -1,
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LastApplied: -1,
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NextIndex: make(map[string]int),
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MatchIndex: make(map[string]int),
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Db: db,
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Storage: rstorage,
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Transport: &HTTPTransport{NodeMap: nodeAddr},
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}
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node.initLeaderState()
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if isRestart {
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node.CurrTerm = rstorage.GetCurrentTerm()
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node.VotedFor = rstorage.GetVotedFor()
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node.Log = rstorage.GetLogEntries()
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log.Sugar().Infof("[%s]从重启中恢复log数量: %d", SelfId, len(node.Log))
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}
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log.Sugar().Infof("[%s]开始监听" + port + "端口", SelfId)
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node.ListenPort(port)
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return node
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}
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func (node *Node) ListenPort(port string) {
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err := rpc.Register(node)
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if err != nil {
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log.Fatal("rpc register failed", zap.Error(err))
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}
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rpc.HandleHTTP()
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l, e := net.Listen("tcp", port)
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if e != nil {
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log.Fatal("listen error:", zap.Error(e))
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}
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go func() {
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err := http.Serve(l, nil)
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if err != nil {
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log.Fatal("http server error:", zap.Error(err))
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}
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}()
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}
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// 线程模拟的初始化
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func InitThreadNode(SelfId string, peerIds []string, db *leveldb.DB, rstorage *RaftStorage, isRestart bool, threadTransport *ThreadTransport) (*Node, chan struct{}) {
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rpcChan := make(chan RPCRequest, 100) // 要监听的chan
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// 创建节点
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node := &Node{
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SelfId: SelfId,
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LeaderId: "",
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Nodes: peerIds,
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MaxLogId: -1, // 后来发现论文中是从1开始的（初始0），但不想改了
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CurrTerm: 1,
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Log: make([]RaftLogEntry, 0),
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CommitIndex: -1,
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LastApplied: -1,
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NextIndex: make(map[string]int),
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MatchIndex: make(map[string]int),
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Db: db,
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Storage: rstorage,
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Transport: threadTransport,
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}
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node.initLeaderState()
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if isRestart {
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node.CurrTerm = rstorage.GetCurrentTerm()
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node.VotedFor = rstorage.GetVotedFor()
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node.Log = rstorage.GetLogEntries()
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log.Sugar().Infof("[%s]从重启中恢复log数量: %d", SelfId, len(node.Log))
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}
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threadTransport.RegisterNodeChan(SelfId, rpcChan)
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quitChan := make(chan struct{}, 1)
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go node.listenForChan(rpcChan, quitChan)
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return node, quitChan
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}
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func (node *Node) listenForChan(rpcChan chan RPCRequest, quitChan chan struct{}) {
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defer node.Db.Close()
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for {
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select {
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case req := <-rpcChan:
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switch req.ServiceMethod {
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case "Node.AppendEntries":
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arg, ok := req.Args.(*AppendEntriesArg)
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resp, ok2 := req.Reply.(*AppendEntriesReply)
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if !ok || !ok2 {
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req.Done <- errors.New("type assertion failed for AppendEntries")
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} else {
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req.Done <- node.AppendEntries(arg, resp)
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}
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case "Node.RequestVote":
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arg, ok := req.Args.(*RequestVoteArgs)
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resp, ok2 := req.Reply.(*RequestVoteReply)
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if !ok || !ok2 {
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req.Done <- errors.New("type assertion failed for RequestVote")
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} else {
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req.Done <- node.RequestVote(arg, resp)
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}
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case "Node.WriteKV":
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arg, ok := req.Args.(*LogEntryCall)
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resp, ok2 := req.Reply.(*ServerReply)
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if !ok || !ok2 {
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req.Done <- errors.New("type assertion failed for WriteKV")
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} else {
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req.Done <- node.WriteKV(arg, resp)
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}
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case "Node.ReadKey":
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arg, ok := req.Args.(*string)
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resp, ok2 := req.Reply.(*ServerReply)
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if !ok || !ok2 {
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req.Done <- errors.New("type assertion failed for ReadKey")
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} else {
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req.Done <- node.ReadKey(arg, resp)
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}
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case "Node.FindLeader":
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arg, ok := req.Args.(struct{})
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resp, ok2 := req.Reply.(*FindLeaderReply)
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if !ok || !ok2 {
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req.Done <- errors.New("type assertion failed for FindLeader")
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} else {
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req.Done <- node.FindLeader(arg, resp)
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}
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default:
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req.Done <- fmt.Errorf("未知方法: %s", req.ServiceMethod)
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}
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case <-quitChan:
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log.Sugar().Infof("[%s] 监听线程收到退出信号", node.SelfId)
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node.Db.Close()
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node.Storage.Close()
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return
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}
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}
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}
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// 共同部分和启动
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func (n *Node) initLeaderState() {
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for _, peerId := range n.Nodes {
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n.NextIndex[peerId] = len(n.Log) // 发送日志的下一个索引
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n.MatchIndex[peerId] = 0 // 复制日志的最新匹配索引
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}
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}
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func Start(node *Node, quitChan chan struct{}) {
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node.State = Follower // 所有节点以 Follower 状态启动
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node.ResetElectionTimer() // 启动选举超时定时器
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go func() {
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ticker := time.NewTicker(50 * time.Millisecond)
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defer ticker.Stop()
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for {
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select {
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case <-quitChan:
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fmt.Printf("[%s] Raft start 退出...\n", node.SelfId)
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return // 退出 goroutine
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case <-ticker.C:
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switch node.State {
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case Follower:
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// 监听心跳超时
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// fmt.Printf("[%s] is a follower, 监听中...\n", node.SelfId)
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case Leader:
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// 发送心跳
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// fmt.Printf("[%s] is the leader, 发送心跳...\n", node.SelfId)
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node.ResetElectionTimer() // leader 不主动触发选举
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node.BroadCastKV()
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}
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}
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}
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}()
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}
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