package serf
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"time"
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"basic.com/pubsub/protomsg.git"
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"basic.com/valib/bhomeclient.git"
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"basic.com/valib/bhomedbapi.git"
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"github.com/gogo/protobuf/proto"
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"github.com/jinzhu/gorm"
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)
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var (
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agent = SyncServer{}
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)
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const (
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serfSyncTopic = "sync-proc-message-to-serf"
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EventCreateCluster = 0
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EventJoinCluster = 1
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EventLeaveCluster = 2
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EventMaster2Slave = 3
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EventSlave2Master = 4
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)
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type ProcMessageEvent struct {
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Owner string `json:"owner"` // 发送者
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Target string `json:"target"` // 指定接收者
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Proc string `json:"procName"` // 进程名
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Topic string `json:"topic"` // 主题
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Payload []byte `json:"payload"` // 消息体,自行解析
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}
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type SyncServer struct {
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ProcName string // 进程名称
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ServerId string // 本机id
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ClusterStatus string // 集群状态 master/slave 为空表示未加入集群
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syncSqlTopic string // 同步sql消息的主题
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queryTableTopic string // 加入集群后请求集群数据的主题
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syncTables []string // 需要同步的表
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sqlDB *gorm.DB // 数据库
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bhClient *bhomeclient.MicroNode
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clusterEventFn func(int)
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}
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func InitAgent(procName string, syncTables []string, db *gorm.DB) *SyncServer {
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agent.ProcName = procName
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agent.ServerId = Vasystem.ServerID
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agent.sqlDB = db
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agent.syncTables = syncTables
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agent.syncSqlTopic = procName + "/serf/sync/sql"
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agent.queryTableTopic = procName + "/serf/query/sqls"
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// 设置日志回调
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db.SetLogger(&DbLogger{})
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// 先关闭日志
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db.LogMode(false)
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return &agent
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}
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func (ss *SyncServer) RegisterClusterEvent(fn func(int)) {
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ss.clusterEventFn = fn
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}
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func (ss *SyncServer) Serve(initChan chan bool) {
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proc := &bhomeclient.ProcInfo{
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Name: ss.ProcName, //进程名称
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ID: ss.ProcName, //进程id
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Info: "", //进程的描述信息，用于区分同一进程名称下多个进程
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}
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ctx, cancel := context.WithCancel(context.Background())
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var reg = &bhomeclient.RegisterInfo{
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Proc: *proc,
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Channel: nil,
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PubTopic: []string{},
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SubTopic: []string{bhomeclient.Proc_System_Service, ss.syncSqlTopic, ss.queryTableTopic},
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SubNetTopic: []string{},
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}
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q := make(chan os.Signal, 1)
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signal.Notify(q, os.Interrupt, os.Kill, syscall.SIGTERM)
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client, err := bhomeclient.NewMicroNode(ctx, q, ss.ServerId, reg, nil)
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if err != nil {
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initChan <- false
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return
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}
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bhomedbapi.InitGetNetNode(client.GetLocalNetNodeByTopic)
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bhomedbapi.InitDoReq(client.RequestOnly)
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//bhomedbapi.InitLog(logger.Debug)
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go client.StartServer(nil)
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ss.bhClient = client
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go ss.subBusMessage(ctx)
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go ss.handleDbLoggerPrint()
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// 启动后查询一次集群状态
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ss.QueryClusterStat()
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if ss.ClusterStatus != "" {
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ss.sqlDB.LogMode(true)
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}
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initChan <- true
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<-q
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client.DeRegister()
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cancel()
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client.Free()
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os.Exit(0)
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}
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func (ss *SyncServer) pubSyncSqlMessage(payload []byte, targetId string) error {
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var msg = ProcMessageEvent{
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Owner: ss.ServerId,
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Target: targetId,
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Proc: ss.ProcName,
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Topic: ss.syncSqlTopic,
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Payload: payload,
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}
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b, err := json.Marshal(msg)
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if err != nil {
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return err
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}
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return ss.bhClient.Publish(serfSyncTopic, b)
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}
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// 请求同步表的全量数据, 发送自己的id
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func (ss *SyncServer) pubSyncTableMessage() error {
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var msg = ProcMessageEvent{
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Owner: ss.ServerId,
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Proc: ss.ProcName,
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Topic: ss.queryTableTopic,
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Payload: []byte(ss.ServerId),
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}
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b, err := json.Marshal(msg)
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if err != nil {
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return err
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}
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fmt.Println("加入集群, 请求同步全量数据,id:", ss.ServerId)
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return ss.bhClient.Publish(serfSyncTopic, b)
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}
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func (ss *SyncServer) subBusMessage(ctx context.Context) {
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//fmt.Println("sub bus msg")
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for {
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select {
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case <-ctx.Done():
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fmt.Println("sub bus msg exit")
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return
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case busMsg := <-ss.bhClient.SubCh:
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if string(busMsg.Topic) == ss.syncSqlTopic {
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ss.handleClusterMessage(busMsg.Data)
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}
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// 处理同步全量数据的请求
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if string(busMsg.Topic) == ss.queryTableTopic {
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if ss.ClusterStatus == "master" {
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fmt.Println("接收到同步全量数据请求")
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ss.handleSyncTableMessage(busMsg.Data)
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}
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}
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// system-service发送的消息
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if string(busMsg.Topic) == bhomeclient.Proc_System_Service {
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var clusterMsg = &protomsg.DbChangeMessage{}
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if err := proto.Unmarshal(busMsg.Data, clusterMsg); err != nil {
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if err = json.Unmarshal(busMsg.Data, clusterMsg); err != nil {
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fmt.Println("proto.Unmarshal ", err.Error())
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continue
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}
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}
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if clusterMsg.Table == protomsg.TableChanged_T_Cluster {
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switch clusterMsg.Info {
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case "create":
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// 创建集群, 开启日志跟踪, 设置角色master
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ss.clusterEventFn(EventCreateCluster)
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ss.ClusterStatus = "master"
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ss.sqlDB.LogMode(true)
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case "join":
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// 加入集群, 开启日志跟踪, 设置角色slave
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ss.clusterEventFn(EventJoinCluster)
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ss.onJoinCluster()
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ss.ClusterStatus = "slave"
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ss.sqlDB.LogMode(true)
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case "leave":
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// 退出集群, 开启日志跟踪, 设置角色slave
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ss.clusterEventFn(EventLeaveCluster)
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ss.ClusterStatus = ""
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ss.sqlDB.LogMode(false)
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}
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}
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}
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}
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}
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}
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// 加入集群, 清空本地表, 同步集群内数据
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func (ss *SyncServer) onJoinCluster() {
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var err error
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db := ss.sqlDB
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tx := db.Begin()
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defer func() {
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if err != nil && tx != nil {
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tx.Rollback()
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}
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}()
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tx.Exec("PRAGMA foreign_keys=OFF")
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//1.删除本地的同步库数据
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for _, t := range ss.syncTables {
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delSql := "delete from " + t + ""
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err = tx.Exec(delSql).Error
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if err != nil {
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fmt.Println("删除本地的同步库数据失败,", err.Error())
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}
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}
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//4.开启reference
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tx.Exec("PRAGMA foreign_keys=ON")
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tx.Commit()
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// 拉取集群内的同步库数据到本地数据库表中
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ss.pubSyncTableMessage()
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}
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func (ss *SyncServer) onLeaveCluster() {
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}
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func (ss *SyncServer) onCreateCluster() {
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}
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// 查询集群状态, 返回 master, slave, leave
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func (ss *SyncServer) QueryClusterStat() string {
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clusterStatTopic := "/data/api-v/cluster/status"
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req := bhomeclient.Request{
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Path: clusterStatTopic,
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Method: "POST",
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}
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reply, err := ss.bhClient.RequestTopic(ss.ServerId, req, 3000)
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if err != nil {
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fmt.Println("RequestTopic error", err.Error())
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return ""
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}
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ss.ClusterStatus = reply.Msg
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fmt.Println("当前集群状态:", ss.ClusterStatus)
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return reply.Msg
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}
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func (ss *SyncServer) handleDbLoggerPrint() {
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sqlBuf := make([]string, 0)
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ticker := time.NewTicker(3 * time.Second)
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sendSize := 0 //serf MaxUserEventSize is 9*1024
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for {
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select {
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case <-ticker.C:
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if len(sqlBuf) > 0 {
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syncSql := strings.Join(sqlBuf, "")
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//fmt.Println("同步sql语句:", syncSql)
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ss.pubSyncSqlMessage([]byte(syncSql), "")
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sqlBuf = append([]string{})
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sendSize = 0
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}
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case sql := <-syncSqlChan:
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if sendSize+len(sql) > (9*1024 - 1024) {
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if len(sqlBuf) > 0 {
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syncSql := strings.Join(sqlBuf, "")
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//fmt.Println("同步sql语句:", syncSql)
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ss.pubSyncSqlMessage([]byte(syncSql), "")
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sqlBuf = append([]string{})
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}
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s := strings.TrimRight(sql, ";")
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sqlBuf = append(sqlBuf, s+";")
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sendSize = len(sql)
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} else {
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s := strings.TrimRight(sql, ";")
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sqlBuf = append(sqlBuf, s+";")
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sendSize = sendSize + len(sql)
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}
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}
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}
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}
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func (ss *SyncServer) handleClusterMessage(msg []byte) {
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//fmt.Println("clusterMessage:", string(msg))
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sql := string(msg)
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if len(sql) <= 0 {
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return
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}
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db := ss.sqlDB
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if db != nil {
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db.LogMode(false)
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defer db.LogMode(true)
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var err error
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tx := db.Begin()
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defer func() {
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if err != nil && tx != nil {
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tx.Rollback()
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}
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}()
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result := tx.Exec(sql)
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err = result.Error
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if err != nil {
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fmt.Println("ExecuteSqlByGorm err:", err, ",sql:", sql)
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}
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if result.RowsAffected == 0 {
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fmt.Println("ExecuteSqlByGorm RowsAffected == 0", ",sql:", sql)
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}
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tx.Commit()
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}
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}
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func (ss *SyncServer) handleSyncTableMessage(msg []byte) error {
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targetId := string(msg)
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fmt.Println("同步全量数据给节点:", targetId)
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sqls, err := DumpTables(ss.sqlDB, ss.syncTables)
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if err != nil {
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fmt.Println("DumpTables error, ", err.Error())
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return err
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}
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syncSql := strings.Join(sqls, ";")
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err = ss.pubSyncSqlMessage([]byte(syncSql), targetId)
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return err
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}
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