func newRaft(home, addr string, peerStore *peerStoreWrapper, fsm raft.FSM, trans *raft.NetworkTransport, cfg *raft.Config) (*Raft, error) {
if err := os.MkdirAll(home, 0700); err != nil {
return nil, err
}
db, err := raftboltdb.NewBoltStore(filepath.Join(home, "raft.db"))
if err != nil {
return nil, fmt.Errorf("error initializing raft db: %v", err)
}
snapStore, err := raft.NewFileSnapshotStore(filepath.Join(home, "snapshots"), 5, nil)
if err != nil {
return nil, fmt.Errorf("error intializing raft snap store: %v", err)
}
r, err := raft.NewRaft(cfg, fsm, db, db, snapStore, peerStore, trans)
if err != nil {
return nil, err
}
raft := &Raft{
r: r,
peers: peerStore,
trans: trans,
db: db,
shutdownCh: make(chan struct{}),
pub: pubsub.NewPublisher(defaultTimeout, 1),
}
go raft.waitLeader()
return raft, nil
}
// Open opens the store. If enableSingle is set, and there are no existing peers,
// then this node becomes the first node, and therefore leader, of the cluster.
func (s *Store) Open(enableSingle bool) error {
if err := os.MkdirAll(s.raftDir, 0755); err != nil {
return err
}
db, err := s.open()
if err != nil {
return err
}
s.db = db
// Get the Raft configuration for this store.
config := s.raftConfig()
// Check for any existing peers.
peers, err := readPeersJSON(filepath.Join(s.raftDir, "peers.json"))
if err != nil {
return err
}
s.joinRequired = len(peers) <= 1
// Allow the node to entry single-mode, potentially electing itself, if
// explicitly enabled and there is only 1 node in the cluster already.
if enableSingle && len(peers) <= 1 {
s.logger.Println("enabling single-node mode")
config.EnableSingleNode = true
config.DisableBootstrapAfterElect = false
}
// Setup Raft communication.
transport := raft.NewNetworkTransport(s.raftTransport, 3, 10*time.Second, os.Stderr)
// Create peer storage if necesssary.
if s.peerStore == nil {
s.peerStore = raft.NewJSONPeers(s.raftDir, transport)
}
// Create the snapshot store. This allows Raft to truncate the log.
snapshots, err := raft.NewFileSnapshotStore(s.raftDir, retainSnapshotCount, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create the log store and stable store.
logStore, err := raftboltdb.NewBoltStore(filepath.Join(s.raftDir, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
// Instantiate the Raft system.
ra, err := raft.NewRaft(config, s, logStore, logStore, snapshots, s.peerStore, transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
s.raft = ra
return nil
}
func main() {
buf, err := ioutil.ReadFile("./config.json")
if err != nil {
log.Fatal(err)
}
var v Config
err = json.Unmarshal(buf, &v)
dataDir := v.DataDir
os.MkdirAll(dataDir, 0755)
if err != nil {
log.Fatal(err)
}
cfg := raft.DefaultConfig()
// cfg.EnableSingleNode = true
fsm := new(Word)
fsm.words = "hahaha"
dbStore, err := raftboltdb.NewBoltStore(path.Join(dataDir, "raft_db"))
if err != nil {
log.Fatal(err)
}
fileStore, err := raft.NewFileSnapshotStore(dataDir, 1, os.Stdout)
if err != nil {
log.Fatal(err)
}
trans, err := raft.NewTCPTransport(v.Bind, nil, 3, 5*time.Second, os.Stdout)
if err != nil {
log.Fatal(err)
}
peers := make([]string, 0, 10)
peers = raft.AddUniquePeer(peers, "192.168.78.151:12345")
peers = raft.AddUniquePeer(peers, "192.168.78.151:12346")
peers = raft.AddUniquePeer(peers, "192.168.78.151:12347")
peerStore := raft.NewJSONPeers(dataDir, trans)
peerStore.SetPeers(peers)
r, err := raft.NewRaft(cfg, fsm, dbStore, dbStore, fileStore, peerStore, trans)
t := time.NewTicker(time.Duration(1) * time.Second)
for {
select {
case <-t.C:
fmt.Println(r.Leader())
}
}
}
// Open opens the store. If enableSingle is set, and there are no existing peers,
// then this node becomes the first node, and therefore leader, of the cluster.
func (s *Store) Open(enableSingle bool) error {
// Setup Raft configuration.
config := raft.DefaultConfig()
// Check for any existing peers.
peers, err := readPeersJSON(filepath.Join(s.RaftDir, "peers.json"))
if err != nil {
return err
}
// Allow the node to entry single-mode, potentially electing itself, if
// explicitly enabled and there is only 1 node in the cluster already.
if enableSingle && len(peers) <= 1 {
s.logger.Println("enabling single-node mode")
config.EnableSingleNode = true
config.DisableBootstrapAfterElect = false
}
// Setup Raft communication.
addr, err := net.ResolveTCPAddr("tcp", s.RaftBind)
if err != nil {
return err
}
transport, err := raft.NewTCPTransport(s.RaftBind, addr, 3, 10*time.Second, os.Stderr)
if err != nil {
return err
}
// Create peer storage.
peerStore := raft.NewJSONPeers(s.RaftDir, transport)
// Create the snapshot store. This allows the Raft to truncate the log.
snapshots, err := raft.NewFileSnapshotStore(s.RaftDir, retainSnapshotCount, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create the log store and stable store.
logStore, err := raftboltdb.NewBoltStore(filepath.Join(s.RaftDir, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
// Instantiate the Raft systems.
ra, err := raft.NewRaft(config, (*fsm)(s), logStore, logStore, snapshots, peerStore, transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
s.raft = ra
return nil
}
func (r *localRaft) openRaft() error {
s := r.store
// Setup raft configuration.
config := raft.DefaultConfig()
config.Logger = s.Logger
config.HeartbeatTimeout = s.HeartbeatTimeout
config.ElectionTimeout = s.ElectionTimeout
config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
config.CommitTimeout = s.CommitTimeout
// If no peers are set in the config then start as a single server.
config.EnableSingleNode = (len(s.peers) == 0)
// Ensure our addr is in the peer list
if config.EnableSingleNode {
s.peers = append(s.peers, s.Addr.String())
}
// Build raft layer to multiplex listener.
r.raftLayer = newRaftLayer(s.RaftListener, s.Addr)
// Create a transport layer
r.transport = raft.NewNetworkTransport(r.raftLayer, 3, 10*time.Second, os.Stderr)
// Create peer storage.
r.peerStore = raft.NewJSONPeers(s.path, r.transport)
// Create the log store and stable store.
store, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
r.raftStore = store
// Create the snapshot store.
snapshots, err := raft.NewFileSnapshotStore(s.path, raftSnapshotsRetained, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create raft log.
ra, err := raft.NewRaft(config, (*storeFSM)(s), store, store, snapshots, r.peerStore, r.transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
r.raft = ra
return nil
}
// makeRaft returns a Raft and its FSM, with snapshots based in the given dir.
func makeRaft(t *testing.T, dir string) (*raft.Raft, *MockFSM) {
snaps, err := raft.NewFileSnapshotStore(dir, 5, nil)
if err != nil {
t.Fatalf("err: %v", err)
}
fsm := &MockFSM{}
store := raft.NewInmemStore()
addr, trans := raft.NewInmemTransport("")
config := raft.DefaultConfig()
config.LocalID = raft.ServerID(fmt.Sprintf("server-%s", addr))
var members raft.Configuration
members.Servers = append(members.Servers, raft.Server{
Suffrage: raft.Voter,
ID: config.LocalID,
Address: addr,
})
err = raft.BootstrapCluster(config, store, store, snaps, trans, members)
if err != nil {
t.Fatalf("err: %v", err)
}
raft, err := raft.NewRaft(config, fsm, store, store, snaps, trans)
if err != nil {
t.Fatalf("err: %v", err)
}
timeout := time.After(10 * time.Second)
for {
if raft.Leader() != "" {
break
}
select {
case <-raft.LeaderCh():
case <-time.After(1 * time.Second):
// Need to poll because we might have missed the first
// go with the leader channel.
case <-timeout:
t.Fatalf("timed out waiting for leader")
}
}
return raft, fsm
}
func NewRaft(cfg *config.Raft, fsm raft.FSM, trans raft.Transport) (*raft.Raft, error) {
raftLogDir := filepath.Join(cfg.DataDir, "log")
raftMetaDir := filepath.Join(cfg.DataDir, "meta")
logStore, err := raftleveldb.NewStore(raftLogDir)
if err != nil {
return nil, err
}
metaStore, err := raftleveldb.NewStore(raftMetaDir)
if err != nil {
return nil, err
}
snapshotStore, err := raft.NewFileSnapshotStore(cfg.DataDir, 3, os.Stderr)
if err != nil {
return nil, err
}
peerStore := raft.NewJSONPeers(cfg.DataDir, trans)
raftConfig := raft.DefaultConfig()
raftConfig.SnapshotInterval = time.Duration(cfg.SnapshotInterval)
raftConfig.SnapshotThreshold = cfg.SnapshotThreshold
raftConfig.EnableSingleNode = cfg.EnableSingleNode
err = raft.ValidateConfig(raftConfig)
if err != nil {
return nil, err
}
return raft.NewRaft(
raftConfig,
fsm,
logStore,
metaStore,
snapshotStore,
peerStore,
trans,
)
}
func newRaft(a *App) (Cluster, error) {
r := new(Raft)
if len(a.config.Raft.Addr) == 0 {
return nil, nil
}
peers := make([]string, 0, len(a.config.Raft.Cluster))
r.raftAddr = a.config.Raft.Addr
addr, err := net.ResolveTCPAddr("tcp", r.raftAddr)
if err != nil {
return nil, fmt.Errorf("invalid raft addr format %s, must host:port, err:%v", r.raftAddr, err)
}
peers = raft.AddUniquePeer(peers, addr.String())
for _, cluster := range a.config.Raft.Cluster {
addr, err = net.ResolveTCPAddr("tcp", cluster)
if err != nil {
return nil, fmt.Errorf("invalid cluster format %s, must host:port, err:%v", cluster, err)
}
peers = raft.AddUniquePeer(peers, addr.String())
}
os.MkdirAll(a.config.Raft.DataDir, 0755)
cfg := raft.DefaultConfig()
if len(a.config.Raft.LogDir) == 0 {
r.log = os.Stdout
} else {
os.MkdirAll(a.config.Raft.LogDir, 0755)
logFile := path.Join(a.config.Raft.LogDir, "raft.log")
f, err := os.OpenFile(logFile, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
if err != nil {
return nil, err
}
r.log = f
cfg.LogOutput = r.log
}
raftDBPath := path.Join(a.config.Raft.DataDir, "raft_db")
r.dbStore, err = raftboltdb.NewBoltStore(raftDBPath)
if err != nil {
return nil, err
}
fileStore, err := raft.NewFileSnapshotStore(a.config.Raft.DataDir, 1, r.log)
if err != nil {
return nil, err
}
r.trans, err = raft.NewTCPTransport(r.raftAddr, nil, 3, 5*time.Second, r.log)
if err != nil {
return nil, err
}
r.peerStore = raft.NewJSONPeers(a.config.Raft.DataDir, r.trans)
if a.config.Raft.ClusterState == ClusterStateNew {
log.Printf("[INFO] cluster state is new, use new cluster config")
r.peerStore.SetPeers(peers)
} else {
log.Printf("[INFO] cluster state is existing, use previous + new cluster config")
ps, err := r.peerStore.Peers()
if err != nil {
log.Printf("[INFO] get store peers error %v", err)
return nil, err
}
for _, peer := range peers {
ps = raft.AddUniquePeer(ps, peer)
}
r.peerStore.SetPeers(ps)
}
if peers, _ := r.peerStore.Peers(); len(peers) <= 1 {
cfg.EnableSingleNode = true
log.Println("[INFO] raft will run in single node mode, may only be used in test")
}
r.r, err = raft.NewRaft(cfg, a.fsm, r.dbStore, r.dbStore, fileStore, r.peerStore, r.trans)
return r, err
}
func main() {
sstore, err := raftboltdb.NewBoltStore("/tmp/stablestore")
if err != nil {
fmt.Printf("%v", err)
os.Exit(1)
}
logstore, err := raftboltdb.NewBoltStore("/tmp/logstore")
if err != nil {
fmt.Printf("Failed to create logstore")
os.Exit(1)
}
snaps, err := raft.NewFileSnapshotStoreWithLogger("/tmp/snapshots", 3, nil)
errorOnExit(err)
transport, err := raft.NewTCPTransport("127.0.0.1:7000", nil, 10, 10*time.Second, nil)
errorOnExit(err)
peerstore := raft.NewJSONPeers("/tmp/peers", transport)
conf := raft.DefaultConfig()
conf.EnableSingleNode = true
conf.SnapshotThreshold = 40
conf.SnapshotInterval = 10 * time.Second
fsm := NewMyFsm()
raftmod, err := raft.NewRaft(conf, fsm, logstore, sstore,
snaps, peerstore, transport)
time.Sleep(2 * time.Second)
fmt.Printf("Leader is %v\n", raftmod.Leader())
future := raftmod.Apply([]byte("hello:value"), 0)
raftFutureErrorCheck(future)
i := 0
for ; i < 100; i++ {
time.Sleep(2 * time.Millisecond)
future := raftmod.Apply([]byte(fmt.Sprintf("key%d:value%d", i, i)), 0)
raftFutureErrorCheck(future)
}
fmt.Printf("Do some fun\n")
reader := bufio.NewReader(os.Stdin)
for {
fmt.Printf("Enter 1 to put, 2 to get, 3 to quit: ")
text, _ := reader.ReadString('\n')
text = strings.Trim(text, "\n")
if text == "3" {
os.Exit(0)
} else if text == "1" {
fmt.Printf("Key: ")
key, _ := reader.ReadString('\n')
key = strings.Trim(key, "\n\b \t\b")
if key == "" {
fmt.Printf("Empty key, continuing")
continue
}
fmt.Printf("Value: ")
value, _ := reader.ReadString('\n')
value = strings.Trim(value, "\n")
raftmod.Apply([]byte(fmt.Sprintf("%s:%s", key, value)), 0)
} else if text == "2" {
fmt.Printf("Key: ")
key, _ := reader.ReadString('\n')
key = strings.Trim(key, "\n\b \t\b")
if key == "" {
fmt.Printf("Empty key, continuing")
continue
}
val, err := fsm.Get(fmt.Sprintf(key))
if err != nil {
fmt.Printf("Failed to get %s\n", key)
} else {
fmt.Printf("The value for key:%s is %s\n", key, val)
}
}
}
}
func (r *localRaft) open() error {
s := r.store
// Setup raft configuration.
config := raft.DefaultConfig()
config.LogOutput = ioutil.Discard
if s.clusterTracingEnabled {
config.Logger = s.Logger
}
config.HeartbeatTimeout = s.HeartbeatTimeout
config.ElectionTimeout = s.ElectionTimeout
config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
config.CommitTimeout = s.CommitTimeout
// If no peers are set in the config or there is one and we are it, then start as a single server.
if len(s.peers) <= 1 {
config.EnableSingleNode = true
// Ensure we can always become the leader
config.DisableBootstrapAfterElect = false
// Don't shutdown raft automatically if we renamed our hostname back to a previous name
config.ShutdownOnRemove = false
}
// Build raft layer to multiplex listener.
r.raftLayer = newRaftLayer(s.RaftListener, s.RemoteAddr)
// Create a transport layer
r.transport = raft.NewNetworkTransport(r.raftLayer, 3, 10*time.Second, config.LogOutput)
// Create peer storage.
r.peerStore = raft.NewJSONPeers(s.path, r.transport)
peers, err := r.peerStore.Peers()
if err != nil {
return err
}
// Make sure our address is in the raft peers or we won't be able to boot into the cluster
if len(peers) > 0 && !raft.PeerContained(peers, s.RemoteAddr.String()) {
s.Logger.Printf("%v is not in the list of raft peers. Please update %v/peers.json on all raft nodes to have the same contents.", s.RemoteAddr.String(), s.Path())
return fmt.Errorf("peers out of sync: %v not in %v", s.RemoteAddr.String(), peers)
}
// Create the log store and stable store.
store, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
r.raftStore = store
// Create the snapshot store.
snapshots, err := raft.NewFileSnapshotStore(s.path, raftSnapshotsRetained, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create raft log.
ra, err := raft.NewRaft(config, (*storeFSM)(s), store, store, snapshots, r.peerStore, r.transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
r.raft = ra
return nil
}
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
// If we are in bootstrap mode, enable a single node cluster
if s.config.Bootstrap || s.config.DevMode {
s.config.RaftConfig.EnableSingleNode = true
}
// Create the FSM
var err error
s.fsm, err = NewFSM(s.tombstoneGC, s.config.LogOutput)
if err != nil {
return err
}
// Create a transport layer
trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
s.raftTransport = trans
var log raft.LogStore
var stable raft.StableStore
var snap raft.SnapshotStore
if s.config.DevMode {
store := raft.NewInmemStore()
s.raftInmem = store
stable = store
log = store
snap = raft.NewDiscardSnapshotStore()
s.raftPeers = &raft.StaticPeers{}
} else {
// Create the base raft path
path := filepath.Join(s.config.DataDir, raftState)
if err := ensurePath(path, true); err != nil {
return err
}
// Create the backend raft store for logs and stable storage
store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
if err != nil {
return err
}
s.raftStore = store
stable = store
// Wrap the store in a LogCache to improve performance
cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
if err != nil {
store.Close()
return err
}
log = cacheStore
// Create the snapshot store
snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
if err != nil {
store.Close()
return err
}
snap = snapshots
// Setup the peer store
s.raftPeers = raft.NewJSONPeers(path, trans)
}
// Ensure local host is always included if we are in bootstrap mode
if s.config.Bootstrap {
peerAddrs, err := s.raftPeers.Peers()
if err != nil {
if s.raftStore != nil {
s.raftStore.Close()
}
return err
}
if !raft.PeerContained(peerAddrs, trans.LocalAddr()) {
s.raftPeers.SetPeers(raft.AddUniquePeer(peerAddrs, trans.LocalAddr()))
}
}
// Make sure we set the LogOutput
s.config.RaftConfig.LogOutput = s.config.LogOutput
// Setup the Raft store
s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, log, stable,
snap, s.raftPeers, trans)
if err != nil {
if s.raftStore != nil {
s.raftStore.Close()
}
trans.Close()
return err
}
// Start monitoring leadership
go s.monitorLeadership()
return nil
}
// Open opens the store. If enableSingle is set, and there are no existing peers,
// then this node becomes the first node, and therefore leader, of the cluster.
func (s *Store) Open(enableSingle bool) error {
if err := os.MkdirAll(s.raftDir, 0755); err != nil {
return err
}
// Create the database. Unless it's a memory-based database, it must be deleted
var db *sql.DB
var err error
if !s.dbConf.Memory {
// as it will be rebuilt from (possibly) a snapshot and committed log entries.
if err := os.Remove(s.dbPath); err != nil && !os.IsNotExist(err) {
return err
}
db, err = sql.OpenWithDSN(s.dbPath, s.dbConf.DSN)
if err != nil {
return err
}
s.logger.Println("SQLite database opened at", s.dbPath)
} else {
db, err = sql.OpenInMemoryWithDSN(s.dbConf.DSN)
if err != nil {
return err
}
s.logger.Println("SQLite in-memory database opened")
}
s.db = db
// Setup Raft configuration.
config := raft.DefaultConfig()
// Check for any existing peers.
peers, err := readPeersJSON(filepath.Join(s.raftDir, "peers.json"))
if err != nil {
return err
}
s.joinRequired = len(peers) <= 1
// Allow the node to entry single-mode, potentially electing itself, if
// explicitly enabled and there is only 1 node in the cluster already.
if enableSingle && len(peers) <= 1 {
s.logger.Println("enabling single-node mode")
config.EnableSingleNode = true
config.DisableBootstrapAfterElect = false
}
// Setup Raft communication.
transport := raft.NewNetworkTransport(s.raftTransport, 3, 10*time.Second, os.Stderr)
// Create peer storage.
peerStore := raft.NewJSONPeers(s.raftDir, transport)
// Create the snapshot store. This allows Raft to truncate the log.
snapshots, err := raft.NewFileSnapshotStore(s.raftDir, retainSnapshotCount, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create the log store and stable store.
logStore, err := raftboltdb.NewBoltStore(filepath.Join(s.raftDir, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
// Instantiate the Raft system.
ra, err := raft.NewRaft(config, s, logStore, logStore, snapshots, peerStore, transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
s.raft = ra
return nil
}
func main() {
flag.Usage = func() {
// It is unfortunate that we need to re-implement flag.PrintDefaults(),
// but I cannot see any other way to achieve the grouping of flags.
fmt.Fprintf(os.Stderr, "RobustIRC server (= node)\n")
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "The following flags are REQUIRED:\n")
printDefault(flag.Lookup("network_name"))
printDefault(flag.Lookup("network_password"))
printDefault(flag.Lookup("peer_addr"))
printDefault(flag.Lookup("tls_cert_path"))
printDefault(flag.Lookup("tls_key_path"))
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "The following flags are only relevant when bootstrapping the network (once):\n")
printDefault(flag.Lookup("join"))
printDefault(flag.Lookup("singlenode"))
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "The following flags are optional:\n")
printDefault(flag.Lookup("dump_canary_state"))
printDefault(flag.Lookup("dump_heap_profile"))
printDefault(flag.Lookup("canary_compaction_start"))
printDefault(flag.Lookup("listen"))
printDefault(flag.Lookup("raftdir"))
printDefault(flag.Lookup("tls_ca_file"))
printDefault(flag.Lookup("version"))
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "The following flags are optional and provided by glog:\n")
printDefault(flag.Lookup("alsologtostderr"))
printDefault(flag.Lookup("log_backtrace_at"))
printDefault(flag.Lookup("log_dir"))
printDefault(flag.Lookup("log_total_bytes"))
printDefault(flag.Lookup("logtostderr"))
printDefault(flag.Lookup("stderrthreshold"))
printDefault(flag.Lookup("v"))
printDefault(flag.Lookup("vmodule"))
}
flag.Parse()
// Store logs in -raftdir, unless otherwise specified.
if flag.Lookup("log_dir").Value.String() == "" {
flag.Set("log_dir", *raftDir)
}
defer glog.Flush()
glog.MaxSize = 64 * 1024 * 1024
glog.CopyStandardLogTo("INFO")
log.Printf("RobustIRC %s\n", Version)
if *version {
return
}
if _, err := os.Stat(filepath.Join(*raftDir, "deletestate")); err == nil {
if err := os.RemoveAll(*raftDir); err != nil {
log.Fatal(err)
}
if err := os.Mkdir(*raftDir, 0700); err != nil {
log.Fatal(err)
}
log.Printf("Deleted %q because %q existed\n", *raftDir, filepath.Join(*raftDir, "deletestate"))
}
if err := outputstream.DeleteOldDatabases(*raftDir); err != nil {
log.Fatalf("Could not delete old outputstream databases: %v\n", err)
}
if err := deleteOldCompactionDatabases(*raftDir); err != nil {
glog.Errorf("Could not delete old compaction databases: %v (ignoring)\n", err)
}
log.Printf("Initializing RobustIRC…\n")
if *networkPassword == "" {
*networkPassword = os.Getenv("ROBUSTIRC_NETWORK_PASSWORD")
}
if *networkPassword == "" {
log.Fatalf("-network_password not set. You MUST protect your network.\n")
}
digest := sha1.New()
digest.Write([]byte(*networkPassword))
passwordHash := "{SHA}" + base64.StdEncoding.EncodeToString(digest.Sum(nil))
if *network == "" {
log.Fatalf("-network_name not set, but required.\n")
}
if *peerAddr == "" {
log.Printf("-peer_addr not set, initializing to %q. Make sure %q is a host:port string that other raft nodes can connect to!\n", *listen, *listen)
*peerAddr = *listen
}
ircServer = ircserver.NewIRCServer(*raftDir, *network, time.Now())
transport := rafthttp.NewHTTPTransport(
*peerAddr,
// Not deadlined, otherwise snapshot installments fail.
robusthttp.Client(*networkPassword, false),
nil,
"")
peerStore = raft.NewJSONPeers(*raftDir, transport)
if *join == "" && !*singleNode {
peers, err := peerStore.Peers()
if err != nil {
log.Fatal(err.Error())
}
if len(peers) == 0 {
if !*timesafeguard.DisableTimesafeguard {
log.Fatalf("No peers known and -join not specified. Joining the network is not safe because timesafeguard cannot be called.\n")
}
} else {
if len(peers) == 1 && peers[0] == *peerAddr {
// To prevent crashlooping too frequently in case the init system directly restarts our process.
time.Sleep(10 * time.Second)
log.Fatalf("Only known peer is myself (%q), implying this node was removed from the network. Please kill the process and remove the data.\n", *peerAddr)
}
if err := timesafeguard.SynchronizedWithNetwork(*peerAddr, peers, *networkPassword); err != nil {
log.Fatal(err.Error())
}
}
}
var p []string
config := raft.DefaultConfig()
config.Logger = log.New(glog.LogBridgeFor("INFO"), "", log.Lshortfile)
if *singleNode {
config.EnableSingleNode = true
}
// Keep 5 snapshots in *raftDir/snapshots, log to stderr.
fss, err := raft.NewFileSnapshotStore(*raftDir, 5, nil)
if err != nil {
log.Fatal(err)
}
// How often to check whether a snapshot should be taken. The check is
// cheap, and the default value far too high for networks with a high
// number of messages/s.
// At the same time, it is important that we don’t check too early,
// otherwise recovering from the most recent snapshot doesn’t work because
// after recovering, a new snapshot (over the 0 committed messages) will be
// taken immediately, effectively overwriting the result of the snapshot
// recovery.
config.SnapshotInterval = 300 * time.Second
// Batch as many messages as possible into a single appendEntries RPC.
// There is no downside to setting this too high.
config.MaxAppendEntries = 1024
// It could be that the heartbeat goroutine is not scheduled for a while,
// so relax the default of 500ms.
config.LeaderLeaseTimeout = timesafeguard.ElectionTimeout
config.HeartbeatTimeout = timesafeguard.ElectionTimeout
config.ElectionTimeout = timesafeguard.ElectionTimeout
// We use prometheus, so hook up the metrics package (used by raft) to
// prometheus as well.
sink, err := metrics_prometheus.NewPrometheusSink()
if err != nil {
log.Fatal(err)
}
metrics.NewGlobal(metrics.DefaultConfig("raftmetrics"), sink)
bootstrapping := *singleNode || *join != ""
logStore, err := raft_store.NewLevelDBStore(filepath.Join(*raftDir, "raftlog"), bootstrapping)
if err != nil {
log.Fatal(err)
}
ircStore, err = raft_store.NewLevelDBStore(filepath.Join(*raftDir, "irclog"), bootstrapping)
if err != nil {
log.Fatal(err)
}
fsm := &FSM{
store: logStore,
ircstore: ircStore,
lastSnapshotState: make(map[uint64][]byte),
}
logcache, err := raft.NewLogCache(config.MaxAppendEntries, logStore)
if err != nil {
log.Fatal(err)
}
node, err = raft.NewRaft(config, fsm, logcache, logStore, fss, peerStore, transport)
if err != nil {
log.Fatal(err)
}
if *dumpCanaryState != "" {
canary(fsm, *dumpCanaryState)
if *dumpHeapProfile != "" {
debug.FreeOSMemory()
f, err := os.Create(*dumpHeapProfile)
if err != nil {
log.Fatal(err)
}
defer f.Close()
pprof.WriteHeapProfile(f)
}
return
}
go func() {
for {
secondsInState.WithLabelValues(node.State().String()).Inc()
time.Sleep(1 * time.Second)
}
}()
privaterouter := httprouter.New()
privaterouter.Handler("GET", "/", exitOnRecoverHandleFunc(handleStatus))
privaterouter.Handler("GET", "/irclog", exitOnRecoverHandleFunc(handleIrclog))
privaterouter.Handler("POST", "/raft/*rest", exitOnRecoverHandler(transport))
privaterouter.Handler("POST", "/join", exitOnRecoverHandleFunc(handleJoin))
privaterouter.Handler("POST", "/part", exitOnRecoverHandleFunc(handlePart))
privaterouter.Handler("GET", "/snapshot", exitOnRecoverHandleFunc(handleSnapshot))
privaterouter.Handler("GET", "/leader", exitOnRecoverHandleFunc(handleLeader))
privaterouter.Handler("POST", "/quit", exitOnRecoverHandleFunc(handleQuit))
privaterouter.Handler("GET", "/config", exitOnRecoverHandleFunc(handleGetConfig))
privaterouter.Handler("POST", "/config", exitOnRecoverHandleFunc(handlePostConfig))
privaterouter.Handler("GET", "/metrics", exitOnRecoverHandler(prometheus.Handler()))
publicrouter := httprouter.New()
publicrouter.Handle("POST", "/robustirc/v1/:sessionid", exitOnRecoverHandle(handleCreateSession))
publicrouter.Handle("POST", "/robustirc/v1/:sessionid/message", exitOnRecoverHandle(handlePostMessage))
publicrouter.Handle("GET", "/robustirc/v1/:sessionid/messages", exitOnRecoverHandle(handleGetMessages))
publicrouter.Handle("DELETE", "/robustirc/v1/:sessionid", exitOnRecoverHandle(handleDeleteSession))
a := auth.NewBasicAuthenticator("robustirc", func(user, realm string) string {
if user == "robustirc" {
return passwordHash
}
return ""
})
http.Handle("/robustirc/", publicrouter)
http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if username := a.CheckAuth(r); username == "" {
a.RequireAuth(w, r)
} else {
privaterouter.ServeHTTP(w, r)
}
}))
srv := http.Server{Addr: *listen}
if err := http2.ConfigureServer(&srv, nil); err != nil {
log.Fatal(err)
}
// Manually create the net.TCPListener so that joinMaster() does not run
// into connection refused errors (the master will try to contact the
// node before acknowledging the join).
srv.TLSConfig.Certificates = make([]tls.Certificate, 1)
srv.TLSConfig.Certificates[0], err = tls.LoadX509KeyPair(*tlsCertPath, *tlsKeyPath)
if err != nil {
log.Fatal(err)
}
ln, err := net.Listen("tcp", *listen)
if err != nil {
log.Fatal(err)
}
tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
go srv.Serve(tlsListener)
log.Printf("RobustIRC listening on %q. For status, see %s\n",
*peerAddr,
fmt.Sprintf("https://*****:*****@%s/", *networkPassword, *peerAddr))
if *join != "" {
if err := timesafeguard.SynchronizedWithMasterAndNetwork(*peerAddr, *join, *networkPassword); err != nil {
log.Fatal(err.Error())
}
p = joinMaster(*join, peerStore)
// TODO(secure): properly handle joins on the server-side where the joining node is already in the network.
}
if len(p) > 0 {
node.SetPeers(p)
}
expireSessionsTimer := time.After(expireSessionsInterval)
secondTicker := time.Tick(1 * time.Second)
for {
select {
case <-secondTicker:
if node.State() == raft.Shutdown {
log.Fatal("Node removed from the network (in raft state shutdown), terminating.")
}
case <-expireSessionsTimer:
expireSessionsTimer = time.After(expireSessionsInterval)
// Race conditions (a node becoming a leader or ceasing to be the
// leader shortly before/after this runs) are okay, since the timer
// is triggered often enough on every node so that it will
// eventually run on the leader.
if node.State() != raft.Leader {
continue
}
applyMu.Lock()
for _, msg := range ircServer.ExpireSessions() {
// Cannot fail, no user input.
msgbytes, _ := json.Marshal(msg)
f := node.Apply(msgbytes, 10*time.Second)
if err := f.Error(); err != nil {
log.Printf("Apply(): %v\n", err)
break
}
}
applyMu.Unlock()
}
}
}
// NewRaft creates a new Raft instance. raft data is stored under the raft dir in prefix.
func NewRaft(c RaftConfig, prefix string, logDir string) (r *Raft, err error) {
r = new(Raft)
config := raft.DefaultConfig()
config.EnableSingleNode = c.Single
var logOutput *os.File
if logDir != "\n" {
logFile := path.Join(logDir, "raft.log")
logOutput, err = os.OpenFile(logFile, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0666)
if err != nil {
Fatal("Could not open raft log file: ", err)
}
config.LogOutput = logOutput
}
raftDir := path.Join(prefix, "raft")
err = os.MkdirAll(raftDir, 0755)
if err != nil {
Fatal("Could not create raft storage dir: ", err)
}
fss, err := raft.NewFileSnapshotStore(raftDir, 1, nil)
if err != nil {
Error("Could not initialize raft snapshot store: ", err)
return
}
// this should be our externally visible address. If not provided in the
// config as 'advertise', we use the address of the listen config.
if c.Advertise == nil {
c.Advertise = &c.Listen
}
a, err := net.ResolveTCPAddr("tcp", *c.Advertise)
if err != nil {
Error("Could not lookup raft advertise address: ", err)
return
}
r.transport, err = raft.NewTCPTransport(c.Listen, a, 3, 10*time.Second, nil)
if err != nil {
Error("Could not create raft transport: ", err)
return
}
peerStore := raft.NewJSONPeers(raftDir, r.transport)
if !c.Single {
var peers []net.Addr
peers, err = peerStore.Peers()
if err != nil {
return
}
for _, peerStr := range c.Peers {
peer, err := net.ResolveTCPAddr("tcp", peerStr)
if err != nil {
Fatal("Bad peer:", err)
}
if !raft.PeerContained(peers, peer) {
peerStore.SetPeers(raft.AddUniquePeer(peers, peer))
}
}
} else {
Warn("Running in single node permitted mode. Only use this for testing!")
}
r.mdb, err = raftmdb.NewMDBStore(raftDir)
if err != nil {
Error("Could not create raft store:", err)
return
}
storage, err := NewStorage()
if err != nil {
Error("Could not create storage:", err)
return
}
r.fsm = &FSM{storage}
r.raft, err = raft.NewRaft(config, r.fsm, r.mdb, r.mdb, fss, peerStore, r.transport)
if err != nil {
Error("Could not initialize raft: ", err)
return
}
return
}
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
// If we are in bootstrap mode, enable a single node cluster
if s.config.Bootstrap {
s.config.RaftConfig.EnableSingleNode = true
}
// Create the base state path
statePath := filepath.Join(s.config.DataDir, tmpStatePath)
if err := os.RemoveAll(statePath); err != nil {
return err
}
if err := ensurePath(statePath, true); err != nil {
return err
}
// Create the FSM
var err error
s.fsm, err = NewFSM(s.tombstoneGC, statePath, s.config.LogOutput)
if err != nil {
return err
}
// Set the maximum raft size based on 32/64bit. Since we are
// doing an mmap underneath, we need to limit our use of virtual
// address space on 32bit, but don't have to care on 64bit.
dbSize := raftDBSize32bit
if runtime.GOARCH == "amd64" {
dbSize = raftDBSize64bit
}
// Create the base raft path
path := filepath.Join(s.config.DataDir, raftState)
if err := ensurePath(path, true); err != nil {
return err
}
// Create the MDB store for logs and stable storage
store, err := raftmdb.NewMDBStoreWithSize(path, dbSize)
if err != nil {
return err
}
s.raftStore = store
// Wrap the store in a LogCache to improve performance
cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
if err != nil {
store.Close()
return err
}
// Create the snapshot store
snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
if err != nil {
store.Close()
return err
}
// Create a transport layer
trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
s.raftTransport = trans
// Setup the peer store
s.raftPeers = raft.NewJSONPeers(path, trans)
// Ensure local host is always included if we are in bootstrap mode
if s.config.Bootstrap {
peers, err := s.raftPeers.Peers()
if err != nil {
store.Close()
return err
}
if !raft.PeerContained(peers, trans.LocalAddr()) {
s.raftPeers.SetPeers(raft.AddUniquePeer(peers, trans.LocalAddr()))
}
}
// Make sure we set the LogOutput
s.config.RaftConfig.LogOutput = s.config.LogOutput
// Setup the Raft store
s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, cacheStore, store,
snapshots, s.raftPeers, trans)
if err != nil {
store.Close()
trans.Close()
return err
}
// Start monitoring leadership
go s.monitorLeadership()
return nil
}
func (r *localRaft) open() error {
r.closing = make(chan struct{})
s := r.store
// Setup raft configuration.
config := raft.DefaultConfig()
config.LogOutput = ioutil.Discard
if s.clusterTracingEnabled {
config.Logger = s.Logger
}
config.HeartbeatTimeout = s.HeartbeatTimeout
config.ElectionTimeout = s.ElectionTimeout
config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
config.CommitTimeout = s.CommitTimeout
// Since we actually never call `removePeer` this is safe.
// If in the future we decide to call remove peer we have to re-evaluate how to handle this
config.ShutdownOnRemove = false
// If no peers are set in the config or there is one and we are it, then start as a single server.
if len(s.peers) <= 1 {
config.EnableSingleNode = true
// Ensure we can always become the leader
config.DisableBootstrapAfterElect = false
}
// Build raft layer to multiplex listener.
r.raftLayer = newRaftLayer(s.RaftListener, s.RemoteAddr)
// Create a transport layer
r.transport = raft.NewNetworkTransport(r.raftLayer, 3, 10*time.Second, config.LogOutput)
// Create peer storage.
r.peerStore = raft.NewJSONPeers(s.path, r.transport)
peers, err := r.peerStore.Peers()
if err != nil {
return err
}
// For single-node clusters, we can update the raft peers before we start the cluster if the hostname
// has changed.
if config.EnableSingleNode {
if err := r.peerStore.SetPeers([]string{s.RemoteAddr.String()}); err != nil {
return err
}
peers = []string{s.RemoteAddr.String()}
}
// If we have multiple nodes in the cluster, make sure our address is in the raft peers or
// we won't be able to boot into the cluster because the other peers will reject our new hostname. This
// is difficult to resolve automatically because we need to have all the raft peers agree on the current members
// of the cluster before we can change them.
if len(peers) > 0 && !raft.PeerContained(peers, s.RemoteAddr.String()) {
s.Logger.Printf("%s is not in the list of raft peers. Please update %v/peers.json on all raft nodes to have the same contents.", s.RemoteAddr.String(), s.Path())
return fmt.Errorf("peers out of sync: %v not in %v", s.RemoteAddr.String(), peers)
}
// Create the log store and stable store.
store, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
r.raftStore = store
// Create the snapshot store.
snapshots, err := raft.NewFileSnapshotStore(s.path, raftSnapshotsRetained, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create raft log.
ra, err := raft.NewRaft(config, (*storeFSM)(s), store, store, snapshots, r.peerStore, r.transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
r.raft = ra
r.wg.Add(1)
go r.logLeaderChanges()
return nil
}
func (r *raftState) open(s *store, ln net.Listener, initializePeers []string) error {
r.ln = ln
r.closing = make(chan struct{})
// Setup raft configuration.
config := raft.DefaultConfig()
config.LogOutput = ioutil.Discard
if r.config.ClusterTracing {
config.Logger = r.logger
}
config.HeartbeatTimeout = time.Duration(r.config.HeartbeatTimeout)
config.ElectionTimeout = time.Duration(r.config.ElectionTimeout)
config.LeaderLeaseTimeout = time.Duration(r.config.LeaderLeaseTimeout)
config.CommitTimeout = time.Duration(r.config.CommitTimeout)
// Since we actually never call `removePeer` this is safe.
// If in the future we decide to call remove peer we have to re-evaluate how to handle this
config.ShutdownOnRemove = false
// Build raft layer to multiplex listener.
r.raftLayer = newRaftLayer(r.addr, r.ln)
// Create a transport layer
r.transport = raft.NewNetworkTransport(r.raftLayer, 3, 10*time.Second, config.LogOutput)
// Create peer storage.
r.peerStore = &peerStore{}
// This server is joining the raft cluster for the first time if initializePeers are passed in
if len(initializePeers) > 0 {
if err := r.peerStore.SetPeers(initializePeers); err != nil {
return err
}
}
peers, err := r.peerStore.Peers()
if err != nil {
return err
}
// If no peers are set in the config or there is one and we are it, then start as a single server.
if len(initializePeers) <= 1 {
config.EnableSingleNode = true
// Ensure we can always become the leader
config.DisableBootstrapAfterElect = false
// Make sure our peer address is here. This happens with either a single node cluster
// or a node joining the cluster, as no one else has that information yet.
if !raft.PeerContained(peers, r.addr) {
if err := r.peerStore.SetPeers([]string{r.addr}); err != nil {
return err
}
}
peers = []string{r.addr}
}
// Create the log store and stable store.
store, err := raftboltdb.NewBoltStore(filepath.Join(r.path, "raft.db"))
if err != nil {
return fmt.Errorf("new bolt store: %s", err)
}
r.raftStore = store
// Create the snapshot store.
snapshots, err := raft.NewFileSnapshotStore(r.path, raftSnapshotsRetained, os.Stderr)
if err != nil {
return fmt.Errorf("file snapshot store: %s", err)
}
// Create raft log.
ra, err := raft.NewRaft(config, (*storeFSM)(s), store, store, snapshots, r.peerStore, r.transport)
if err != nil {
return fmt.Errorf("new raft: %s", err)
}
r.raft = ra
r.wg.Add(1)
go r.logLeaderChanges()
return nil
}
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
// If we have an unclean exit then attempt to close the Raft store.
defer func() {
if s.raft == nil && s.raftStore != nil {
if err := s.raftStore.Close(); err != nil {
s.logger.Printf("[ERR] consul: failed to close Raft store: %v", err)
}
}
}()
// Create the FSM.
var err error
s.fsm, err = NewFSM(s.tombstoneGC, s.config.LogOutput)
if err != nil {
return err
}
// Create a transport layer.
trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
s.raftTransport = trans
// Make sure we set the LogOutput.
s.config.RaftConfig.LogOutput = s.config.LogOutput
// Our version of Raft protocol requires the LocalID to match the network
// address of the transport.
s.config.RaftConfig.LocalID = raft.ServerID(trans.LocalAddr())
// Build an all in-memory setup for dev mode, otherwise prepare a full
// disk-based setup.
var log raft.LogStore
var stable raft.StableStore
var snap raft.SnapshotStore
if s.config.DevMode {
store := raft.NewInmemStore()
s.raftInmem = store
stable = store
log = store
snap = raft.NewInmemSnapshotStore()
} else {
// Create the base raft path.
path := filepath.Join(s.config.DataDir, raftState)
if err := ensurePath(path, true); err != nil {
return err
}
// Create the backend raft store for logs and stable storage.
store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
if err != nil {
return err
}
s.raftStore = store
stable = store
// Wrap the store in a LogCache to improve performance.
cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
if err != nil {
return err
}
log = cacheStore
// Create the snapshot store.
snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
if err != nil {
return err
}
snap = snapshots
// For an existing cluster being upgraded to the new version of
// Raft, we almost never want to run recovery based on the old
// peers.json file. We create a peers.info file with a helpful
// note about where peers.json went, and use that as a sentinel
// to avoid ingesting the old one that first time (if we have to
// create the peers.info file because it's not there, we also
// blow away any existing peers.json file).
peersFile := filepath.Join(path, "peers.json")
peersInfoFile := filepath.Join(path, "peers.info")
if _, err := os.Stat(peersInfoFile); os.IsNotExist(err) {
if err := ioutil.WriteFile(peersInfoFile, []byte(peersInfoContent), 0755); err != nil {
return fmt.Errorf("failed to write peers.info file: %v", err)
}
// Blow away the peers.json file if present, since the
// peers.info sentinel wasn't there.
if _, err := os.Stat(peersFile); err == nil {
if err := os.Remove(peersFile); err != nil {
return fmt.Errorf("failed to delete peers.json, please delete manually (see peers.info for details): %v", err)
}
s.logger.Printf("[INFO] consul: deleted peers.json file (see peers.info for details)")
}
} else if _, err := os.Stat(peersFile); err == nil {
s.logger.Printf("[INFO] consul: found peers.json file, recovering Raft configuration...")
configuration, err := raft.ReadPeersJSON(peersFile)
if err != nil {
return fmt.Errorf("recovery failed to parse peers.json: %v", err)
}
tmpFsm, err := NewFSM(s.tombstoneGC, s.config.LogOutput)
if err != nil {
return fmt.Errorf("recovery failed to make temp FSM: %v", err)
}
if err := raft.RecoverCluster(s.config.RaftConfig, tmpFsm,
log, stable, snap, trans, configuration); err != nil {
return fmt.Errorf("recovery failed: %v", err)
}
if err := os.Remove(peersFile); err != nil {
return fmt.Errorf("recovery failed to delete peers.json, please delete manually (see peers.info for details): %v", err)
}
s.logger.Printf("[INFO] consul: deleted peers.json file after successful recovery")
}
}
// If we are in bootstrap or dev mode and the state is clean then we can
// bootstrap now.
if s.config.Bootstrap || s.config.DevMode {
hasState, err := raft.HasExistingState(log, stable, snap)
if err != nil {
return err
}
if !hasState {
// TODO (slackpad) - This will need to be updated when
// we add support for node IDs.
configuration := raft.Configuration{
Servers: []raft.Server{
raft.Server{
ID: raft.ServerID(trans.LocalAddr()),
Address: trans.LocalAddr(),
},
},
}
if err := raft.BootstrapCluster(s.config.RaftConfig,
log, stable, snap, trans, configuration); err != nil {
return err
}
}
}
// Setup the Raft store.
s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, log, stable, snap, trans)
if err != nil {
return err
}
// Start monitoring leadership.
go s.monitorLeadership()
return nil
}
func newPeer(c *Config, fsm *fsm) (*peer, error) {
r := &peer{}
var err error = nil
r.addr = c.Raft.Addr
os.MkdirAll(c.Raft.DataDir, 0755)
cfg := raft.DefaultConfig()
raftDBPath := path.Join(c.Raft.DataDir, "raft_db")
r.dbStore, err = raftboltdb.NewBoltStore(raftDBPath)
if err != nil {
return nil, err
}
fileStore, err := raft.NewFileSnapshotStore(c.Raft.DataDir, 1, os.Stderr)
if err != nil {
return nil, err
}
r.trans, err = raft.NewTCPTransport(r.addr, nil, 3, 5*time.Second, os.Stderr)
if err != nil {
return nil, err
}
r.peerStore = raft.NewJSONPeers(c.Raft.DataDir, r.trans)
if c.Raft.ClusterState == ClusterStateNew {
log.Info("cluster state is new, use new cluster config")
r.peerStore.SetPeers(c.Raft.Cluster)
} else {
log.Info("cluster state is existing, use previous + new cluster config")
ps, err := r.peerStore.Peers()
if err != nil {
log.Error("get store peers error %v", err)
return nil, err
}
for _, peer := range c.Raft.Cluster {
ps = raft.AddUniquePeer(ps, peer)
}
r.peerStore.SetPeers(ps)
}
if peers, _ := r.peerStore.Peers(); len(peers) <= 1 {
cfg.EnableSingleNode = true
log.Notice("raft running in single node mode")
}
r.fsm = fsm
r.r, err = raft.NewRaft(cfg, fsm, r.dbStore, r.dbStore, fileStore, r.peerStore, r.trans)
if err != nil {
return nil, err
}
// watch for leadership changes
go func() {
for isLeader := range r.r.LeaderCh() {
if isLeader {
log.Info("new leader http: %v", c.Addr)
r.apply(&action{Cmd: CmdNewLeader, Leader: c.Addr}, applyRetries)
}
}
}()
return r, nil
}
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
// If we are in bootstrap mode, enable a single node cluster
if s.config.Bootstrap {
s.config.RaftConfig.EnableSingleNode = true
}
// Create the base path
path := filepath.Join(s.config.DataDir, raftState)
if err := ensurePath(path, true); err != nil {
return err
}
// Create the FSM
var err error
s.fsm, err = NewFSM(s.config.LogOutput)
if err != nil {
return err
}
// Create the MDB store for logs and stable storage
store, err := raftmdb.NewMDBStoreWithSize(path, raftDBSize)
if err != nil {
return err
}
s.raftStore = store
// Create the snapshot store
snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
if err != nil {
store.Close()
return err
}
// Create a transport layer
trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
s.raftTransport = trans
// Setup the peer store
s.raftPeers = raft.NewJSONPeers(path, trans)
// Ensure local host is always included if we are in bootstrap mode
if s.config.Bootstrap {
peers, err := s.raftPeers.Peers()
if err != nil {
store.Close()
return err
}
if !raft.PeerContained(peers, trans.LocalAddr()) {
s.raftPeers.SetPeers(raft.AddUniquePeer(peers, trans.LocalAddr()))
}
}
// Make sure we set the LogOutput
s.config.RaftConfig.LogOutput = s.config.LogOutput
// Setup the Raft store
s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, store, store,
snapshots, s.raftPeers, trans)
if err != nil {
store.Close()
trans.Close()
return err
}
// Start monitoring leadership
go s.monitorLeadership()
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
config.ShutdownOnRemove = false
// 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.
//
// The mutex must be unlocked as initializing the raft store may
// call back into methods which acquire the lock (e.g. Restore)
s.mu.Unlock()
r, err := raft.NewRaft(config, s, cacheStore, stableStore, ss, s.peerStore, s.transport)
s.mu.Lock()
if err != nil {
return fmt.Errorf("raft: %s", err)
}
// make sure the store was not closed whilst the mutex was unlocked
select {
case <-s.closing:
return ErrShutdown
default:
}
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
}
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
// If we are in bootstrap mode, enable a single node cluster
if s.config.Bootstrap || (s.config.DevMode && !s.config.DevDisableBootstrap) {
s.config.RaftConfig.EnableSingleNode = true
}
// Create the FSM
var err error
s.fsm, err = NewFSM(s.evalBroker, s.periodicDispatcher, s.config.LogOutput)
if err != nil {
return err
}
// Create a transport layer
trans := raft.NewNetworkTransport(s.raftLayer, 3, s.config.RaftTimeout,
s.config.LogOutput)
s.raftTransport = trans
// Create the backend raft store for logs and stable storage
var log raft.LogStore
var stable raft.StableStore
var snap raft.SnapshotStore
var peers raft.PeerStore
if s.config.DevMode {
store := raft.NewInmemStore()
s.raftInmem = store
stable = store
log = store
snap = raft.NewDiscardSnapshotStore()
peers = &raft.StaticPeers{}
s.raftPeers = peers
} else {
// Create the base raft path
path := filepath.Join(s.config.DataDir, raftState)
if err := ensurePath(path, true); err != nil {
return err
}
// Create the BoltDB backend
store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
if err != nil {
return err
}
s.raftStore = store
stable = store
// Wrap the store in a LogCache to improve performance
cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
if err != nil {
store.Close()
return err
}
log = cacheStore
// Create the snapshot store
snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
if err != nil {
if s.raftStore != nil {
s.raftStore.Close()
}
return err
}
snap = snapshots
// Setup the peer store
s.raftPeers = raft.NewJSONPeers(path, trans)
peers = s.raftPeers
}
// Ensure local host is always included if we are in bootstrap mode
if s.config.RaftConfig.EnableSingleNode {
p, err := peers.Peers()
if err != nil {
if s.raftStore != nil {
s.raftStore.Close()
}
return err
}
if !raft.PeerContained(p, trans.LocalAddr()) {
peers.SetPeers(raft.AddUniquePeer(p, trans.LocalAddr()))
}
}
// Make sure we set the LogOutput
s.config.RaftConfig.LogOutput = s.config.LogOutput
// Setup the leader channel
leaderCh := make(chan bool, 1)
s.config.RaftConfig.NotifyCh = leaderCh
s.leaderCh = leaderCh
// Setup the Raft store
s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, log, stable,
snap, peers, trans)
if err != nil {
if s.raftStore != nil {
s.raftStore.Close()
}
trans.Close()
return err
}
return nil
}
// setupRaft is used to setup and initialize Raft
func (c *cerebrum) setupRaft() error {
// If we are in bootstrap mode, enable a single node cluster
if c.config.Bootstrap {
c.config.RaftConfig.EnableSingleNode = true
}
// Create the base state path
statePath := filepath.Join(c.config.DataPath, tmpStatePath)
if err := os.RemoveAll(statePath); err != nil {
return err
}
if err := os.MkdirAll(filepath.Dir(statePath), 0755); err != nil {
return err
}
// Create the base raft path
path := filepath.Join(c.config.DataPath, RaftStateDir)
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return err
}
// Create the backend raft store for logs and stable storage
store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
if err != nil {
return err
}
c.raftStore = store
// Wrap the store in a LogCache to improve performance
cacheStore, err := raft.NewLogCache(c.config.LogCacheSize, store)
if err != nil {
store.Close()
return err
}
// Create the snapshot store
snapshots, err := raft.NewFileSnapshotStore(path, c.config.SnapshotsRetained, c.config.LogOutput)
if err != nil {
store.Close()
return err
}
// Try to bind
addr, err := net.ResolveTCPAddr("tcp", c.config.RaftBindAddr)
if err != nil {
return err
}
// Start TCP listener
listener, err := net.ListenTCP("tcp", addr)
if err != nil {
return err
}
// Create connection layer and transport
layer := NewRaftLayer(c.dialer, listener.Addr(), c.config.TLSConfig)
c.raftTransport = raft.NewNetworkTransport(layer, 3, 10*time.Second, c.config.LogOutput)
// Create TLS connection dispatcher
dispatcher := yamuxer.NewDispatcher(log.NewLogger(c.config.LogOutput, "dispatcher"), nil)
dispatcher.Register(connRaft, layer)
dispatcher.Register(connForward, &ForwardingHandler{c.applier, log.NewLogger(c.config.LogOutput, "forwarder")})
// Create TLS connection muxer
c.muxer = yamuxer.New(c.context, &yamuxer.Config{
Listener: listener,
TLSConfig: c.config.TLSConfig,
Deadline: c.config.ConnectionDeadline,
LogOutput: c.config.LogOutput,
Dispatcher: dispatcher,
})
// Setup the peer store
c.raftPeers = raft.NewJSONPeers(path, c.raftTransport)
// Ensure local host is always included if we are in bootstrap mode
if c.config.Bootstrap {
peers, err := c.raftPeers.Peers()
if err != nil {
store.Close()
return err
}
if !raft.PeerContained(peers, c.raftTransport.LocalAddr()) {
c.raftPeers.SetPeers(raft.AddUniquePeer(peers, c.raftTransport.LocalAddr()))
}
}
// Make sure we set the LogOutput
c.config.RaftConfig.LogOutput = c.config.LogOutput
// Setup the Raft store
c.raft, err = raft.NewRaft(c.config.RaftConfig, c.fsm, cacheStore, store,
snapshots, c.raftPeers, c.raftTransport)
if err != nil {
store.Close()
c.raftTransport.Close()
return err
}
// Setup forwarding and applier
c.forwarder = NewForwarder(c.raft, c.dialer, log.NewLogger(c.config.LogOutput, "forwarder"))
c.applier = NewApplier(c.raft, c.forwarder, log.NewLogger(c.config.LogOutput, "applier"), c.config.EnqueueTimeout)
// // Start monitoring leadership
// c.t.Go(func() error {
// c.monitorLeadership()
// return nil
// })
return nil
}