/
raft.go
178 lines (160 loc) · 4.22 KB
/
raft.go
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package raft
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"github.com/autom8ter/morpheus/pkg/raft/storage"
transport2 "github.com/autom8ter/morpheus/pkg/raft/transport"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/raft"
"github.com/palantir/stacktrace"
"github.com/pkg/errors"
"net"
"os"
"time"
)
type Raft struct {
raft *raft.Raft
opts *Options
}
func NewRaft(fsm raft.FSM, lis net.Listener, opts ...Opt) (*Raft, error) {
options := &Options{}
for _, o := range opts {
o(options)
}
options.setDefaults()
config := raft.DefaultConfig()
config.LogLevel = "ERROR"
if options.debug {
config.LogLevel = "DEBUG"
}
config.NoSnapshotRestoreOnStart = !options.restoreSnapshotOnRestart
config.LocalID = raft.ServerID(options.peerID)
if options.leaseTimeout != 0 {
config.LeaderLeaseTimeout = options.leaseTimeout
}
if options.heartbeatTimeout != 0 {
config.HeartbeatTimeout = options.heartbeatTimeout
}
if options.electionTimeout != 0 {
config.ElectionTimeout = options.electionTimeout
}
if options.commitTimeout != 0 {
config.CommitTimeout = options.commitTimeout
}
host, _ := os.Hostname()
path := fmt.Sprintf("%s/%s", options.raftDir, host)
snapshotPath := fmt.Sprintf("%s/snapshots", path)
os.MkdirAll(snapshotPath, 0700)
lgger := rlogger{
logger: hclog.L(),
}
transport := transport2.NewNetworkTransport(lis, options.advertise, options.maxPool, options.timeout, lgger)
snapshots, err := raft.NewFileSnapshotStoreWithLogger(snapshotPath, options.retainSnapshots, lgger)
if err != nil {
return nil, err
}
storagePath := fmt.Sprintf("%s/storage", path)
os.MkdirAll(storagePath, 0700)
strg, err := storage.NewStorage(storagePath)
if err != nil {
return nil, stacktrace.Propagate(err, "")
}
ra, err := raft.NewRaft(config, fsm, strg, strg, snapshots, transport)
if err != nil {
return nil, stacktrace.Propagate(err, "")
}
if options.isLeader {
configuration := raft.Configuration{
Servers: []raft.Server{
{
ID: config.LocalID,
Address: transport.LocalAddr(),
},
},
}
ra.BootstrapCluster(configuration)
}
return &Raft{
opts: options,
raft: ra,
}, nil
}
func (r *Raft) State() raft.RaftState {
return r.raft.State()
}
func (s *Raft) Servers() ([]raft.Server, error) {
configFuture := s.raft.GetConfiguration()
if err := configFuture.Error(); err != nil {
return nil, err
}
return configFuture.Configuration().Servers, nil
}
func (s *Raft) Join(nodeID, addr string) error {
tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return errors.Wrapf(err, "failed to parse voter %s address", nodeID)
}
configFuture := s.raft.GetConfiguration()
if err := configFuture.Error(); err != nil {
return errors.Wrap(err, "failed to get raft configuration")
}
for _, srv := range configFuture.Configuration().Servers {
if srv.ID == raft.ServerID(nodeID) || srv.Address == raft.ServerAddress(addr) {
// However if *both* the ID and the address are the same, then nothing -- not even
// a join operation -- is needed.
if srv.Address == raft.ServerAddress(addr) && srv.ID == raft.ServerID(nodeID) {
// already a member
return nil
}
future := s.raft.RemoveServer(srv.ID, 0, 0)
if err := future.Error(); err != nil {
return fmt.Errorf("error removing existing node %s at %s: %s", nodeID, addr, err)
}
}
}
errs := 0
for {
f := s.raft.AddVoter(raft.ServerID(nodeID), raft.ServerAddress(tcpAddr.String()), 0, 0)
if err := f.Error(); err != nil {
errs++
if errs >= 5 {
return errors.Wrap(err, "failed to add raft voter")
}
time.Sleep(1 * time.Second)
continue
} else {
break
}
}
return nil
}
func (s *Raft) LeaderAddr() string {
return string(s.raft.Leader())
}
func (s *Raft) Stats() map[string]string {
return s.raft.Stats()
}
func (s *Raft) Apply(bits []byte) (interface{}, error) {
f := s.raft.Apply(bits, s.opts.timeout)
if err := f.Error(); err != nil {
return nil, err
}
resp := f.Response()
if err, ok := resp.(error); ok {
return nil, err
}
return resp, nil
}
func (r *Raft) Close() error {
return r.raft.Shutdown().Error()
}
func (r *Raft) PeerID() string {
return r.opts.peerID
}
func hash(val []byte) string {
h := sha1.New()
h.Write(val)
bs := h.Sum(nil)
return hex.EncodeToString(bs)
}