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