/
peer.go
239 lines (213 loc) · 4.73 KB
/
peer.go
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package members
import (
"context"
"errors"
"fmt"
"github.com/hashicorp/memberlist"
"github.com/tsingsun/woocoo/pkg/log"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"math/rand"
"net"
"os"
"strconv"
"sync"
"time"
)
var logger = log.Component("members")
var defaultOption = Options{
JoinTTL: time.Second * 1,
JoinRetry: 3,
}
// Shard is some specified distributed data handler.
type Shard interface {
// Name returns the name of the shard, which is used to identify the shard.
Name() string
// MarshalBinary marshals the shard data into a binary to sync other nodes.
MarshalBinary() ([]byte, error)
// Merge data from remote node MarshalBinary result. The Shard should be able to dedupe the data.
Merge(b []byte) error
}
// Peer is a memberlist Node wrapper
type Peer struct {
Options
members *memberlist.Memberlist
membersConfig *memberlist.Config
shards map[string]Shard
mu sync.RWMutex
msgc chan []byte
delegate *delegate
}
func NewPeer(opts ...Option) (*Peer, error) {
options := defaultOption
for _, o := range opts {
o(&options)
}
p := &Peer{
Options: options,
membersConfig: memberlist.DefaultLocalConfig(),
msgc: make(chan []byte, 100),
}
p.apply()
ml, err := memberlist.Create(p.membersConfig)
if err != nil {
return nil, err
}
p.members = ml
return p, nil
}
func (p *Peer) apply() {
var err error
if p.Cnf != nil {
if p.Cnf.IsSet("options") {
if err = p.Cnf.Sub("options").Unmarshal(&p.Options); err != nil {
panic(err)
}
}
if p.Cnf.IsSet("memberList") {
if err = p.Cnf.Sub("memberList").Unmarshal(p.membersConfig); err != nil {
panic(err)
}
}
}
if p.Options.ID != "" {
p.membersConfig.Name = p.Options.ID
} else {
hostname, _ := os.Hostname()
p.membersConfig.Name = hostname + "-" + strconv.Itoa(rand.Intn(1000))
}
if p.membersConfig.BindAddr != "" {
p.membersConfig.BindAddr, err = lookupIPAddr(p.membersConfig.BindAddr, false)
if err != nil {
panic(err)
}
}
if len(p.Options.KnownPeers) > 0 {
rps := make([]string, 0, len(p.Options.KnownPeers))
for _, peer := range p.Options.KnownPeers {
ad, err := lookupIPAddr(peer, false)
if err != nil {
continue
}
rps = append(rps, ad)
}
p.Options.KnownPeers = rps
}
p.membersConfig.LogOutput = logger.Logger().IOWriter(zapcore.DebugLevel)
p.membersConfig.Events = &event{}
p.delegate = newDelegate(p)
p.membersConfig.Delegate = p.delegate
}
func (p *Peer) Address() string {
return p.members.LocalNode().FullAddress().Addr
}
func (p *Peer) MemberCount() int {
return p.members.NumMembers()
}
func (p *Peer) AddShard(sd Shard) (Spreader, error) {
return p.delegate.AddShard(sd)
}
func (p *Peer) Join(ctx context.Context) error {
t := time.NewTicker(p.JoinTTL)
count := 0
for {
select {
case <-ctx.Done():
if p.members != nil {
return p.Stop(context.Background())
}
return ctx.Err()
case <-t.C:
count++
if count > p.JoinRetry {
return fmt.Errorf("join retry timeout")
}
_, err := p.members.Join(p.KnownPeers)
if err != nil {
continue
}
return nil
}
}
}
func (p *Peer) Start(ctx context.Context) error {
return p.ReliableMsgHandle(ctx)
}
func (p *Peer) Stop(ctx context.Context) error {
if p.members != nil {
p.members.Leave(0)
p.members.Shutdown()
}
close(p.msgc)
return nil
}
func (p *Peer) OthersNodes() []*memberlist.Node {
nodes := p.members.Members()
for i, n := range p.members.Members() {
if n.Name == p.members.LocalNode().Name {
nodes = append(nodes[:i], nodes[i+1:]...)
break
}
}
return nodes
}
func (p *Peer) SendReliable(b []byte) {
p.msgc <- b
}
func (p *Peer) ReliableMsgHandle(ctx context.Context) error {
var wg sync.WaitGroup
for {
select {
case b, ok := <-p.msgc:
if !ok {
return nil
}
for _, node := range p.OthersNodes() {
wg.Add(1)
go func(n *memberlist.Node) {
defer wg.Done()
if err := p.members.SendReliable(n, b); err != nil {
logger.Error("channel broadcast error", zap.Error(err))
return
}
}(node)
}
wg.Wait()
case <-ctx.Done():
return nil
}
}
}
// OversizedMessage indicates whether or not the byte payload should be sent
// via TCP.
func OversizedMessage(b []byte, size int) bool {
return len(b) > size/2
}
func lookupIPAddr(host string, ipv6 bool) (addr string, err error) {
host, port, err := net.SplitHostPort(host)
if err != nil {
var ae *net.AddrError
if errors.As(err, &ae) {
host = ae.Addr
} else {
return
}
}
ips, err := net.LookupIP(host)
if err != nil {
return
}
for _, ip := range ips {
if ipv6 && ip.To16() != nil {
addr = ip.String()
break
} else if ip.To4() != nil {
addr = ip.String()
break
}
}
if port != "" {
addr = net.JoinHostPort(addr, port)
}
return
}