// Open starts the raft consensus and opens the store.
func (s *Store) Open() error {
s.mu.Lock()
defer s.mu.Unlock()
// Require bind address & advertise address.
if s.BindAddress == "" {
return ErrBindAddressRequired
} else if s.Advertise == nil {
return ErrAdvertiseRequired
}
// Create root directory.
if err := os.MkdirAll(s.path, 0777); err != nil {
return err
}
// Create raft configuration.
config := raft.DefaultConfig()
config.HeartbeatTimeout = s.HeartbeatTimeout
config.ElectionTimeout = s.ElectionTimeout
config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
config.CommitTimeout = s.CommitTimeout
config.LogOutput = s.LogOutput
config.EnableSingleNode = s.EnableSingleNode
// Begin listening to TCP port.
trans, err := raft.NewTCPTransport(s.BindAddress, s.Advertise, 3, 10*time.Second, os.Stderr)
if err != nil {
return fmt.Errorf("opening tcp transport: %s", err)
}
s.transport = trans
// Setup storage layers.
s.peerStore = raft.NewJSONPeers(s.path, s.transport)
stableStore, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
if err != nil {
return fmt.Errorf("stable store: %s", err)
}
s.stableStore = stableStore
// Create the snapshot store.
ss, err := raft.NewFileSnapshotStore(s.path, 2, os.Stderr)
if err != nil {
return fmt.Errorf("snapshot store: %s", err)
}
// Create raft log.
r, err := raft.NewRaft(config, s, stableStore, stableStore, ss, s.peerStore, s.transport)
if err != nil {
return fmt.Errorf("raft: %s", err)
}
s.raft = r
return nil
}
// Open starts the raft consensus and opens the store.
func (s *Store) Open() error {
s.mu.Lock()
defer s.mu.Unlock()
// Set up logging.
s.logger = log.New(s.LogOutput, "[discoverd] ", log.LstdFlags)
// Require listener & advertise address.
if s.Listener == nil {
return ErrListenerRequired
} else if s.Advertise == nil {
return ErrAdvertiseRequired
}
// Create root directory.
if err := os.MkdirAll(s.path, 0777); err != nil {
return err
}
// Create raft configuration.
config := raft.DefaultConfig()
config.HeartbeatTimeout = s.HeartbeatTimeout
config.ElectionTimeout = s.ElectionTimeout
config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
config.CommitTimeout = s.CommitTimeout
config.LogOutput = s.LogOutput
config.EnableSingleNode = s.EnableSingleNode
// Create multiplexing transport layer.
raftLayer := newRaftLayer(s.Listener, s.Advertise)
// Begin listening to TCP port.
s.transport = raft.NewNetworkTransport(raftLayer, 3, 10*time.Second, os.Stderr)
// Setup storage layers.
s.peerStore = raft.NewJSONPeers(s.path, s.transport)
stableStore, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
if err != nil {
return fmt.Errorf("stable store: %s", err)
}
s.stableStore = stableStore
// Wrap the store in a LogCache to improve performance
cacheStore, err := raft.NewLogCache(512, stableStore)
if err != nil {
stableStore.Close()
return fmt.Errorf("log cache: %s", err)
}
// Create the snapshot store.
ss, err := raft.NewFileSnapshotStore(s.path, 2, os.Stderr)
if err != nil {
return fmt.Errorf("snapshot store: %s", err)
}
// Create raft log.
r, err := raft.NewRaft(config, s, cacheStore, stableStore, ss, s.peerStore, s.transport)
if err != nil {
return fmt.Errorf("raft: %s", err)
}
s.raft = r
// Start goroutine to monitor leadership changes.
s.wg.Add(1)
go s.monitorLeaderCh()
// Start goroutine to check for instance expiry.
s.wg.Add(1)
go s.expirer()
return nil
}