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topom_sentinel.go
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/
topom_sentinel.go
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// Copyright 2016 CodisLabs. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package topom
import (
"time"
"github.com/CodisLabs/codis/pkg/models"
"github.com/CodisLabs/codis/pkg/utils/errors"
"github.com/CodisLabs/codis/pkg/utils/log"
"github.com/CodisLabs/codis/pkg/utils/math2"
"github.com/CodisLabs/codis/pkg/utils/redis"
"github.com/CodisLabs/codis/pkg/utils/sync2"
)
func (s *Topom) AddSentinel(addr string) error {
s.mu.Lock()
defer s.mu.Unlock()
ctx, err := s.newContext()
if err != nil {
return err
}
if addr == "" {
return errors.Errorf("invalid sentinel address")
}
p := ctx.sentinel
for _, x := range p.Servers {
if x == addr {
return errors.Errorf("sentinel-[%s] already exists", addr)
}
}
sentinel := redis.NewSentinel(s.config.ProductName, s.config.ProductAuth)
if err := sentinel.FlushConfig(addr, s.config.SentinelClientTimeout.Duration()); err != nil {
return err
}
defer s.dirtySentinelCache()
p.Servers = append(p.Servers, addr)
p.OutOfSync = true
return s.storeUpdateSentinel(p)
}
func (s *Topom) DelSentinel(addr string, force bool) error {
s.mu.Lock()
defer s.mu.Unlock()
ctx, err := s.newContext()
if err != nil {
return err
}
if addr == "" {
return errors.Errorf("invalid sentinel address")
}
p := ctx.sentinel
var slice []string
for _, x := range p.Servers {
if x != addr {
slice = append(slice, x)
}
}
if len(slice) == len(p.Servers) {
return errors.Errorf("sentinel-[%s] not found", addr)
}
defer s.dirtySentinelCache()
p.OutOfSync = true
if err := s.storeUpdateSentinel(p); err != nil {
return err
}
sentinel := redis.NewSentinel(s.config.ProductName, s.config.ProductAuth)
if err := sentinel.RemoveGroupsAll([]string{addr}, s.config.SentinelClientTimeout.Duration()); err != nil {
log.WarnErrorf(err, "remove sentinel %s failed", addr)
if !force {
return errors.Errorf("remove sentinel %s failed", addr)
}
}
p.Servers = slice
return s.storeUpdateSentinel(p)
}
func (s *Topom) SwitchMasters(masters map[int]string) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed {
return ErrClosedTopom
}
s.ha.masters = masters
if len(masters) != 0 {
cache := &redis.InfoCache{
Auth: s.config.ProductAuth, Timeout: time.Millisecond * 100,
}
for gid, master := range masters {
if err := s.trySwitchGroupMaster(gid, master, cache); err != nil {
log.WarnErrorf(err, "sentinel switch group master failed")
}
}
}
return nil
}
func (s *Topom) rewatchSentinels(servers []string) {
if s.ha.monitor != nil {
s.ha.monitor.Cancel()
s.ha.monitor = nil
}
if len(servers) == 0 {
s.ha.masters = nil
} else {
s.ha.monitor = redis.NewSentinel(s.config.ProductName, s.config.ProductAuth)
s.ha.monitor.LogFunc = log.Warnf
s.ha.monitor.ErrFunc = log.WarnErrorf
go func(p *redis.Sentinel) {
var trigger = make(chan struct{}, 1)
delayUntil := func(deadline time.Time) {
for !p.IsCanceled() {
var d = deadline.Sub(time.Now())
if d <= 0 {
return
}
time.Sleep(math2.MinDuration(d, time.Second))
}
}
go func() {
defer close(trigger)
callback := func() {
select {
case trigger <- struct{}{}:
default:
}
}
for !p.IsCanceled() {
timeout := time.Minute * 15
retryAt := time.Now().Add(time.Second * 10)
if !p.Subscribe(servers, timeout, callback) {
delayUntil(retryAt)
} else {
callback()
}
}
}()
go func() {
for range trigger {
var success int
for i := 0; i != 10 && !p.IsCanceled() && success != 2; i++ {
timeout := time.Second * 5
masters, err := p.Masters(servers, timeout)
if err != nil {
log.WarnErrorf(err, "fetch group masters failed")
} else {
if !p.IsCanceled() {
s.SwitchMasters(masters)
}
success += 1
}
delayUntil(time.Now().Add(time.Second * 5))
}
}
}()
}(s.ha.monitor)
}
log.Warnf("rewatch sentinels = %v", servers)
}
func (s *Topom) ResyncSentinels() error {
s.mu.Lock()
defer s.mu.Unlock()
ctx, err := s.newContext()
if err != nil {
return err
}
defer s.dirtySentinelCache()
p := ctx.sentinel
p.OutOfSync = true
if err := s.storeUpdateSentinel(p); err != nil {
return err
}
config := &redis.MonitorConfig{
Quorum: s.config.SentinelQuorum,
ParallelSyncs: s.config.SentinelParallelSyncs,
DownAfter: s.config.SentinelDownAfter.Duration(),
FailoverTimeout: s.config.SentinelFailoverTimeout.Duration(),
NotificationScript: s.config.SentinelNotificationScript,
ClientReconfigScript: s.config.SentinelClientReconfigScript,
}
sentinel := redis.NewSentinel(s.config.ProductName, s.config.ProductAuth)
if err := sentinel.RemoveGroupsAll(p.Servers, s.config.SentinelClientTimeout.Duration()); err != nil {
log.WarnErrorf(err, "remove sentinels failed")
}
if err := sentinel.MonitorGroups(p.Servers, s.config.SentinelClientTimeout.Duration(), config, ctx.getGroupMasters()); err != nil {
log.WarnErrorf(err, "resync sentinels failed")
return err
}
s.rewatchSentinels(p.Servers)
var fut sync2.Future
for _, p := range ctx.proxy {
fut.Add()
go func(p *models.Proxy) {
err := s.newProxyClient(p).SetSentinels(ctx.sentinel)
if err != nil {
log.ErrorErrorf(err, "proxy-[%s] resync sentinel failed", p.Token)
}
fut.Done(p.Token, err)
}(p)
}
for t, v := range fut.Wait() {
switch err := v.(type) {
case error:
if err != nil {
return errors.Errorf("proxy-[%s] sentinel failed", t)
}
}
}
p.OutOfSync = false
return s.storeUpdateSentinel(p)
}