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|
package weed_server
import (
"encoding/json"
"math/rand"
"os"
"path"
"sort"
"strings"
"time"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/raft"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/topology"
)
type RaftServerOption struct {
GrpcDialOption grpc.DialOption
Peers []pb.ServerAddress
ServerAddr pb.ServerAddress
DataDir string
Topo *topology.Topology
RaftResumeState bool
HeartbeatInterval time.Duration
ElectionTimeout time.Duration
}
type RaftServer struct {
peers []pb.ServerAddress // initial peers to join with
raftServer raft.Server
dataDir string
serverAddr pb.ServerAddress
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(),
}
glog.V(1).Infof("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
}
glog.V(1).Infof("Recovery raft state %+v", state)
s.topo.UpAdjustMaxVolumeId(state.MaxVolumeId)
return nil
}
func NewRaftServer(option *RaftServerOption) (*RaftServer, error) {
s := &RaftServer{
peers: option.Peers,
serverAddr: option.ServerAddr,
dataDir: option.DataDir,
topo: option.Topo,
}
if glog.V(4) {
raft.SetLogLevel(2)
}
raft.RegisterCommand(&topology.MaxVolumeIdCommand{})
var err error
transporter := raft.NewGrpcTransporter(option.GrpcDialOption)
glog.V(0).Infof("Starting RaftServer with %v", option.ServerAddr)
// always clear previous log to avoid server is promotable
os.RemoveAll(path.Join(s.dataDir, "log"))
if !option.RaftResumeState {
// always clear previous metadata
os.RemoveAll(path.Join(s.dataDir, "conf"))
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: option.Topo}
s.raftServer, err = raft.NewServer(string(s.serverAddr), s.dataDir, transporter, stateMachine, option.Topo, "")
if err != nil {
glog.V(0).Infoln(err)
return nil, err
}
heartbeatInterval := time.Duration(float64(option.HeartbeatInterval) * (rand.Float64()*0.25 + 1))
s.raftServer.SetHeartbeatInterval(heartbeatInterval)
s.raftServer.SetElectionTimeout(option.ElectionTimeout)
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(string(peer), peer.ToGrpcAddress()); err != nil {
return nil, err
}
}
// Remove deleted peers
for existsPeerName := range s.raftServer.Peers() {
exists := false
var existingPeer pb.ServerAddress
for _, peer := range s.peers {
if peer.String() == existsPeerName {
exists, existingPeer = true, peer
break
}
}
if !exists {
if err := s.raftServer.RemovePeer(existsPeerName); err != nil {
glog.V(0).Infoln(err)
return nil, err
} else {
glog.V(0).Infof("removing old peer: %s", existingPeer)
}
}
}
s.GrpcServer = raft.NewGrpcServer(s.raftServer)
if s.raftServer.IsLogEmpty() && isTheFirstOne(option.ServerAddr, s.peers) {
// Initialize the server by joining itself.
// s.DoJoinCommand()
}
glog.V(0).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 pb.ServerAddress, peers []pb.ServerAddress) bool {
sort.Slice(peers, func(i, j int) bool {
return strings.Compare(string(peers[i]), string(peers[j])) < 0
})
if len(peers) <= 0 {
return true
}
return self == peers[0]
}
func (s *RaftServer) DoJoinCommand() {
glog.V(0).Infoln("Initializing new cluster")
if _, err := s.raftServer.Do(&raft.DefaultJoinCommand{
Name: s.raftServer.Name(),
ConnectionString: s.serverAddr.ToGrpcAddress(),
}); err != nil {
glog.Errorf("fail to send join command: %v", err)
}
}
|
