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cluster.go
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cluster.go
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package gossipCluster
import (
"fmt"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/memberlist"
"github.com/hashicorp/raft"
"github.com/ronaksoft/rony"
"github.com/ronaksoft/rony/internal/cluster"
"github.com/ronaksoft/rony/internal/log"
"github.com/ronaksoft/rony/tools"
"go.uber.org/zap"
"io/ioutil"
"net"
"os"
"path/filepath"
"sync"
"time"
)
/*
Creation Time: 2021 - Jan - 01
Created by: (ehsan)
Maintainers:
1. Ehsan N. Moosa (E2)
Auditor: Ehsan N. Moosa (E2)
Copyright Ronak Software Group 2020
*/
// Config
type Config struct {
ServerID []byte
Bootstrap bool
RaftPort int
ReplicaSet uint64
Mode cluster.Mode
GossipPort int
}
// Cluster
type Cluster struct {
cluster.ReplicaMessageHandler
dataPath string
cfg Config
mtx sync.RWMutex
localServerID []byte
localGatewayAddr []string
localTunnelAddr []string
replicaLeaderID string
replicaMembers map[uint64]map[string]*Member
clusterMembers map[string]*Member
// Raft & Gossip
raftFSM raftFSM
raft *raft.Raft
gossip *memberlist.Memberlist
// badgerStore *raftbadger.BadgerStore
rateLimitChan chan struct{}
}
func New(dataPath string, cfg Config) *Cluster {
if cfg.GossipPort == 0 {
cfg.GossipPort = 7946
}
switch cfg.Mode {
case cluster.MultiReplica, cluster.SingleReplica:
default:
panic("only singleReplica and multiReplica supported")
}
c := &Cluster{
dataPath: dataPath,
cfg: cfg,
localServerID: cfg.ServerID,
clusterMembers: make(map[string]*Member, 100),
replicaMembers: make(map[uint64]map[string]*Member, 100),
rateLimitChan: make(chan struct{}, clusterMessageRateLimit),
}
c.raftFSM = raftFSM{c: c}
return c
}
func (c *Cluster) updateCluster(timeout time.Duration) error {
return c.gossip.UpdateNode(timeout)
}
func (c *Cluster) startGossip() error {
cd := &clusterDelegate{
c: c,
}
conf := memberlist.DefaultLANConfig()
conf.Name = string(c.localServerID)
conf.Events = cd
conf.Delegate = cd
conf.Alive = cd
conf.LogOutput = ioutil.Discard
conf.Logger = nil
conf.BindPort = c.cfg.GossipPort
if s, err := memberlist.Create(conf); err != nil {
log.Warn("Error On Creating MemberList", zap.Error(err))
return err
} else {
c.gossip = s
}
return c.updateCluster(gossipUpdateTimeout)
}
func (c *Cluster) startRaft(notifyChan chan bool) (err error) {
// Initialize LogStore for Raft
dirPath := filepath.Join(c.dataPath, "raft")
_ = os.MkdirAll(dirPath, os.ModePerm)
// Initialize Raft
raftConfig := raft.DefaultConfig()
raftConfig.LogLevel = "WARN"
raftConfig.NotifyCh = notifyChan
raftConfig.Logger = hclog.NewNullLogger()
raftConfig.LocalID = raft.ServerID(c.localServerID)
addrs, err := net.InterfaceAddrs()
if err != nil {
return err
}
var raftAdvertiseAddr *net.TCPAddr
var raftBind string
for _, addr := range addrs {
ipNet, ok := addr.(*net.IPNet)
if ok {
if ipNet.IP == nil || ipNet.IP.IsLoopback() || ipNet.IP.To4() == nil {
continue
}
raftBind = fmt.Sprintf("%s:%d", ipNet.IP.String(), c.cfg.RaftPort)
raftAdvertiseAddr, err = net.ResolveTCPAddr("tcp", raftBind)
if err != nil {
return err
}
break
}
}
raftTransport, err := raft.NewTCPTransport(raftBind, raftAdvertiseAddr, 3, 10*time.Second, os.Stdout)
if err != nil {
return err
}
raftSnapshot, err := raft.NewFileSnapshotStore(dirPath, 3, os.Stdout)
if err != nil {
return err
}
badgerStore := &BadgerStore{}
c.raft, err = raft.NewRaft(raftConfig, c.raftFSM, badgerStore, badgerStore, raftSnapshot, raftTransport)
if err != nil {
return err
}
if c.cfg.Bootstrap {
bootConfig := raft.Configuration{
Servers: []raft.Server{
{
ID: raftConfig.LocalID,
Address: raftTransport.LocalAddr(),
},
},
}
f := c.raft.BootstrapCluster(bootConfig)
if err := f.Error(); err != nil {
if err == raft.ErrCantBootstrap {
log.Info("Error On Raft Bootstrap", zap.Error(err))
} else {
log.Warn("Error On Raft Bootstrap", zap.Error(err))
}
}
}
return nil
}
func (c *Cluster) addMember(m *Member) {
c.mtx.Lock()
defer c.mtx.Unlock()
// set the raft leader if the newly added member is the leader and is in our replica set
if m.replicaSet == c.cfg.ReplicaSet && m.raftState == rony.RaftState_Leader {
c.replicaLeaderID = m.serverID
}
// add new member to the cluster
c.clusterMembers[m.serverID] = m
if c.replicaMembers[m.replicaSet] == nil {
c.replicaMembers[m.replicaSet] = make(map[string]*Member, 5)
}
c.replicaMembers[m.replicaSet][m.serverID] = m
}
func (c *Cluster) updateMember(en *rony.EdgeNode) (*Member, error) {
c.mtx.Lock()
defer c.mtx.Unlock()
m := c.clusterMembers[tools.B2S(en.ServerID)]
if m == nil {
return nil, fmt.Errorf("update a node not exists: %s", tools.B2S(en.ServerID))
}
m.Merge(en)
return m, nil
}
func (c *Cluster) removeMember(en *rony.EdgeNode) {
c.mtx.Lock()
defer c.mtx.Unlock()
serverID := tools.B2S(en.ServerID)
if serverID == c.replicaLeaderID {
c.replicaLeaderID = ""
}
delete(c.clusterMembers, serverID)
if c.replicaMembers[en.ReplicaSet] != nil {
delete(c.replicaMembers[en.ReplicaSet], serverID)
}
}
func (c *Cluster) Start() {
err := c.startGossip()
if err != nil {
return
}
if c.cfg.Mode == cluster.MultiReplica {
notifyChan := make(chan bool, 1)
err := c.startRaft(notifyChan)
if err != nil {
log.Warn("Error On Starting Raft", zap.Error(err))
return
}
go func() {
for range notifyChan {
err := tools.Try(10, time.Millisecond, func() error {
return c.updateCluster(gossipUpdateTimeout)
})
if err != nil {
log.Warn("Rony got error on updating the cluster",
zap.Error(err),
zap.ByteString("ID", c.localServerID),
)
}
}
}()
}
}
func (c *Cluster) Join(addr ...string) (int, error) {
return c.gossip.Join(addr)
}
func (c *Cluster) Shutdown() {
// shutdown raft, if it is enabled
if c.cfg.Mode == cluster.MultiReplica {
if f := c.raft.Snapshot(); f.Error() != nil {
if f.Error() != raft.ErrNothingNewToSnapshot {
log.Warn("Error On Shutdown (Raft Snapshot)",
zap.Error(f.Error()),
zap.ByteString("ServerID", c.localServerID),
)
} else {
log.Info("Error On Shutdown (Raft Snapshot)", zap.Error(f.Error()))
}
}
if f := c.raft.Shutdown(); f.Error() != nil {
log.Warn("Error On Shutdown (Raft Shutdown)", zap.Error(f.Error()))
}
}
// Shutdown gossip
err := c.gossip.Leave(gossipLeaveTimeout)
if err != nil {
log.Warn("Error On Leaving Cluster, but we shutdown anyway", zap.Error(err))
}
err = c.gossip.Shutdown()
if err != nil {
log.Warn("Error On Shutdown (Gossip)", zap.Error(err))
}
}
func (c *Cluster) Members() []cluster.Member {
members := make([]cluster.Member, 0, 16)
c.mtx.RLock()
for _, cm := range c.clusterMembers {
members = append(members, cm)
}
c.mtx.RUnlock()
return members
}
func (c *Cluster) TotalReplicas() int {
return len(c.replicaMembers)
}
func (c *Cluster) RaftEnabled() bool {
return c.raft != nil
}
func (c *Cluster) RaftState() raft.RaftState {
switch c.cfg.Mode {
case cluster.SingleReplica:
return raft.Leader
case cluster.MultiReplica:
return c.raft.State()
default:
panic("unsupported replica mode")
}
}
func (c *Cluster) RaftApply(cmd []byte) raft.ApplyFuture {
switch c.cfg.Mode {
case cluster.SingleReplica:
return nil
case cluster.MultiReplica:
return c.raft.Apply(cmd, raftApplyTimeout)
default:
panic("unsupported replica mode")
}
}
func (c *Cluster) RaftMembers(replicaSet uint64) []cluster.Member {
members := make([]cluster.Member, 0, 8)
c.mtx.RLock()
for _, cm := range c.replicaMembers[replicaSet] {
members = append(members, cm)
}
c.mtx.RUnlock()
return members
}
func (c *Cluster) RaftLeaderID() string {
return c.replicaLeaderID
}
func (c *Cluster) SetGatewayAddrs(hostPorts []string) error {
c.localGatewayAddr = hostPorts
return c.updateCluster(gossipUpdateTimeout)
}
func (c *Cluster) SetTunnelAddrs(hostPorts []string) error {
c.localTunnelAddr = hostPorts
return c.updateCluster(gossipUpdateTimeout)
}
func (c *Cluster) Addr() string {
return fmt.Sprintf("%s:%d", c.gossip.LocalNode().Addr.String(), c.gossip.LocalNode().Port)
}
func (c *Cluster) ReplicaSet() uint64 {
return c.cfg.ReplicaSet
}