mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-05 20:09:03 +08:00
164 lines
3.7 KiB
Go
164 lines
3.7 KiB
Go
package weed_server
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import (
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"encoding/json"
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"math/rand"
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"os"
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"path"
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"sort"
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"time"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/raft"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/topology"
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)
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type RaftServer struct {
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peers []string // initial peers to join with
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raftServer raft.Server
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dataDir string
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serverAddr string
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topo *topology.Topology
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*raft.GrpcServer
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}
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type StateMachine struct {
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raft.StateMachine
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topo *topology.Topology
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}
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func (s StateMachine) Save() ([]byte, error) {
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state := topology.MaxVolumeIdCommand{
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MaxVolumeId: s.topo.GetMaxVolumeId(),
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}
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glog.V(1).Infof("Save raft state %+v", state)
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return json.Marshal(state)
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}
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func (s StateMachine) Recovery(data []byte) error {
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state := topology.MaxVolumeIdCommand{}
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err := json.Unmarshal(data, &state)
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if err != nil {
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return err
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}
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glog.V(1).Infof("Recovery raft state %+v", state)
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s.topo.UpAdjustMaxVolumeId(state.MaxVolumeId)
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return nil
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}
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func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, dataDir string, topo *topology.Topology, raftResumeState bool) (*RaftServer, error) {
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s := &RaftServer{
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peers: peers,
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serverAddr: serverAddr,
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dataDir: dataDir,
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topo: topo,
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}
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if glog.V(4) {
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raft.SetLogLevel(2)
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}
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raft.RegisterCommand(&topology.MaxVolumeIdCommand{})
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var err error
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transporter := raft.NewGrpcTransporter(grpcDialOption)
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glog.V(0).Infof("Starting RaftServer with %v", serverAddr)
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if !raftResumeState {
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// always clear previous metadata
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os.RemoveAll(path.Join(s.dataDir, "conf"))
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os.RemoveAll(path.Join(s.dataDir, "log"))
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os.RemoveAll(path.Join(s.dataDir, "snapshot"))
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}
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if err := os.MkdirAll(path.Join(s.dataDir, "snapshot"), 0600); err != nil {
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return nil, err
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}
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stateMachine := StateMachine{topo: topo}
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s.raftServer, err = raft.NewServer(s.serverAddr, s.dataDir, transporter, stateMachine, topo, "")
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if err != nil {
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glog.V(0).Infoln(err)
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return nil, err
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}
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s.raftServer.SetHeartbeatInterval(time.Duration(300+rand.Intn(150)) * time.Millisecond)
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s.raftServer.SetElectionTimeout(10 * time.Second)
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if err := s.raftServer.LoadSnapshot(); err != nil {
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return nil, err
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}
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if err := s.raftServer.Start(); err != nil {
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return nil, err
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}
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for _, peer := range s.peers {
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if err := s.raftServer.AddPeer(peer, pb.ServerToGrpcAddress(peer)); err != nil {
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return nil, err
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}
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}
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// Remove deleted peers
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for existsPeerName := range s.raftServer.Peers() {
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exists, existingPeer := false, ""
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for _, peer := range s.peers {
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if pb.ServerToGrpcAddress(peer) == existsPeerName {
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exists, existingPeer = true, peer
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break
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}
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}
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if exists {
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if err := s.raftServer.RemovePeer(existsPeerName); err != nil {
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glog.V(0).Infoln(err)
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return nil, err
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} else {
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glog.V(0).Infof("removing old peer %s", existingPeer)
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}
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}
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}
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s.GrpcServer = raft.NewGrpcServer(s.raftServer)
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if s.raftServer.IsLogEmpty() && isTheFirstOne(serverAddr, s.peers) {
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// Initialize the server by joining itself.
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// s.DoJoinCommand()
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}
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glog.V(0).Infof("current cluster leader: %v", s.raftServer.Leader())
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return s, nil
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}
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func (s *RaftServer) Peers() (members []string) {
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peers := s.raftServer.Peers()
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for _, p := range peers {
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members = append(members, p.Name)
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}
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return
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}
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func isTheFirstOne(self string, peers []string) bool {
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sort.Strings(peers)
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if len(peers) <= 0 {
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return true
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}
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return self == peers[0]
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}
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func (s *RaftServer) DoJoinCommand() {
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glog.V(0).Infoln("Initializing new cluster")
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if _, err := s.raftServer.Do(&raft.DefaultJoinCommand{
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Name: s.raftServer.Name(),
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ConnectionString: pb.ServerToGrpcAddress(s.serverAddr),
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}); err != nil {
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glog.Errorf("fail to send join command: %v", err)
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}
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}
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