/
migrate.go
496 lines (416 loc) · 12.3 KB
/
migrate.go
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package cluster
import "github.com/humpback/gounits/logger"
import (
"fmt"
"sync"
"time"
)
// MigrateState is exported
type MigrateState int
const (
MigrateReady = iota + 1
Migrating
MigrateFailure
MigrateCompleted
)
func (state MigrateState) String() string {
switch state {
case MigrateReady:
return "MigrateReady"
case Migrating:
return "Migrating"
case MigrateFailure:
return "MigrateFailure"
case MigrateCompleted:
return "MigrateCompleted"
}
return ""
}
// MigrateContainer is exported
type MigrateContainer struct {
sync.RWMutex
ID string
metaData *MetaData
baseConfig *ContainerBaseConfig
filter *EnginesFilter
state MigrateState
}
// NewMigrateContainer is exported
func NewMigrateContainer(containerid string, baseConfig *ContainerBaseConfig) *MigrateContainer {
if baseConfig == nil || baseConfig.MetaData == nil {
return nil
}
return &MigrateContainer{
ID: containerid,
metaData: baseConfig.MetaData,
baseConfig: baseConfig,
filter: NewEnginesFilter(),
state: MigrateReady,
}
}
// GetState is exported
func (mContainer *MigrateContainer) GetState() MigrateState {
mContainer.RLock()
defer mContainer.RUnlock()
return mContainer.state
}
// SetState is exported
func (mContainer *MigrateContainer) SetState(state MigrateState) {
mContainer.Lock()
mContainer.state = state
mContainer.Unlock()
}
// Execute is exported
func (mContainer *MigrateContainer) Execute(cluster *Cluster) {
mContainer.SetState(Migrating)
mContainer.baseConfig.ID = "" //re-create a new container
engine, container, err := cluster.createContainer(mContainer.metaData, mContainer.filter, nil, mContainer.baseConfig.Container)
if err != nil {
mContainer.SetState(MigrateFailure)
logger.ERROR("[#cluster] migrator container %s error %s", ShortContainerID(mContainer.ID), err.Error())
return
}
mContainer.Lock()
mContainer.state = MigrateCompleted
logger.INFO("[#cluster] migrator container %s > %s to %s", ShortContainerID(mContainer.ID), ShortContainerID(container.Info.ID), engine.IP)
mContainer.Unlock()
return
}
// Migrator is exported
type Migrator struct {
sync.RWMutex
MetaID string
Cluster *Cluster
retryCount int64
migrateDelay time.Duration
containers []*MigrateContainer
handler MigratorHandler
}
// NewMigrator is exported
func NewMigrator(metaid string, containers Containers, cluster *Cluster, migrateDelay time.Duration, handler MigratorHandler) *Migrator {
mContainers := []*MigrateContainer{}
for _, container := range containers {
mContainer := NewMigrateContainer(container.Info.ID, container.BaseConfig)
if mContainer != nil {
mContainers = append(mContainers, mContainer)
}
}
return &Migrator{
MetaID: metaid,
Cluster: cluster,
retryCount: cluster.createRetry,
migrateDelay: migrateDelay,
containers: mContainers,
handler: handler,
}
}
func (migrator *Migrator) verifyEngines() bool {
_, engines, err := migrator.Cluster.GetMetaDataEngines(migrator.MetaID)
if err != nil {
return false
}
for _, engine := range engines {
if engine.IsHealthy() {
return true
}
}
return false
}
func (migrator *Migrator) isAllCompleted() bool {
migrator.RLock()
defer migrator.RUnlock()
for _, mContainer := range migrator.containers {
if mContainer.GetState() != MigrateCompleted {
return false
}
}
return true
}
func (migrator *Migrator) isPartCompleted() bool {
migrator.RLock()
defer migrator.RUnlock()
nCompletedCount := 0
for _, mContainer := range migrator.containers {
if mContainer.GetState() == MigrateCompleted {
nCompletedCount = nCompletedCount + 1
}
}
if nCompletedCount == 0 {
return false
}
return nCompletedCount != len(migrator.containers)
}
func (migrator *Migrator) resetMigrateContainers() {
migrator.Lock()
for _, mContainer := range migrator.containers {
if mContainer.GetState() == MigrateFailure {
mContainer.SetState(MigrateReady)
}
}
migrator.retryCount = migrator.retryCount - 1
migrator.Unlock()
}
func (migrator *Migrator) selectMigrateContainer() *MigrateContainer {
migrator.RLock()
defer migrator.RUnlock()
for _, mContainer := range migrator.containers {
if mContainer.GetState() == MigrateReady {
return mContainer
}
}
return nil
}
func (migrator *Migrator) removeMigrateContainer(mContainer *MigrateContainer) {
migrator.Lock()
for i, pmContainer := range migrator.containers {
if pmContainer == mContainer {
migrator.containers = append(migrator.containers[:i], migrator.containers[i+1:]...)
break
}
}
migrator.Unlock()
}
func (migrator *Migrator) clearMigrateContainers() {
migrator.Lock()
migrator.containers = []*MigrateContainer{}
migrator.Unlock()
}
// Containers is exported
func (migrator *Migrator) Containers() []*MigrateContainer {
migrator.RLock()
mContainers := []*MigrateContainer{}
for _, mContainer := range migrator.containers {
mContainers = append(mContainers, mContainer)
}
migrator.RUnlock()
return mContainers
}
// Container is exported
func (migrator *Migrator) Container(containerid string) *MigrateContainer {
migrator.RLock()
defer migrator.RUnlock()
for _, mContainer := range migrator.containers {
if mContainer.ID == containerid {
return mContainer
}
}
return nil
}
// Start is exported
func (migrator *Migrator) Start() {
time.Sleep(migrator.migrateDelay)
for {
migrator.RLock()
mContainers := migrator.containers
migrator.RUnlock()
if len(mContainers) == 0 {
break
}
if !migrator.isAllCompleted() {
if !migrator.verifyEngines() {
err := fmt.Errorf("cluster no docker-engine available")
logger.ERROR("[#cluster] migrator %s containers error %s.", migrator.MetaID, err)
migrator.clearMigrateContainers()
migrator.Cluster.configCache.ClearContainerBaseConfig(migrator.MetaID)
migrator.handler.OnMigratorNotifyHandleFunc(migrator, err)
break
}
}
mContainer := migrator.selectMigrateContainer()
if mContainer != nil {
mContainer.Execute(migrator.Cluster)
if mContainer.GetState() == MigrateCompleted {
migrator.Cluster.configCache.RemoveContainerBaseConfig(migrator.MetaID, mContainer.ID)
}
continue
}
if migrator.isAllCompleted() {
migrator.handler.OnMigratorNotifyHandleFunc(migrator, nil)
break
}
if migrator.retryCount <= 0 {
migrator.Lock()
for _, mContainer := range migrator.containers {
if mContainer.GetState() == MigrateFailure {
migrator.Cluster.configCache.RemoveContainerBaseConfig(migrator.MetaID, mContainer.ID)
}
}
migrator.Unlock()
migrator.handler.OnMigratorNotifyHandleFunc(migrator, fmt.Errorf("meta containers part migrated failure."))
break
}
if migrator.isPartCompleted() {
migrator.handler.OnMigratorNotifyHandleFunc(migrator, fmt.Errorf("meta containers part migrated completed."))
}
migrator.resetMigrateContainers()
continue
}
migrator.clearMigrateContainers()
migrator.handler.OnMigratorQuitHandleFunc(migrator)
}
// Update is exported
func (migrator *Migrator) Update(metaid string, containers Containers) {
for _, container := range containers {
if mContainer := migrator.Container(container.Info.ID); mContainer == nil {
mContainer = NewMigrateContainer(container.Info.ID, container.BaseConfig)
if mContainer != nil {
migrator.Lock()
migrator.containers = append(migrator.containers, mContainer)
migrator.Unlock()
}
}
}
}
// Cancel is exported
func (migrator *Migrator) Cancel(metaid string, containers Containers) {
for _, container := range containers {
if mContainer := migrator.Container(container.Info.ID); mContainer != nil {
state := mContainer.GetState()
if state == MigrateReady || state == MigrateFailure {
migrator.removeMigrateContainer(mContainer)
}
}
}
}
// Clear is exported
func (migrator *Migrator) Clear() {
migrator.Lock()
migrator.containers = []*MigrateContainer{}
migrator.Unlock()
}
// MigratorHandler is exported
type MigratorHandler interface {
OnMigratorQuitHandleFunc(migrator *Migrator)
OnMigratorNotifyHandleFunc(migrator *Migrator, err error)
}
// MigratorQuitHandleFunc is exported
type MigratorQuitHandleFunc func(migrator *Migrator)
// OnMigratorQuitHandleFunc is exported
func (fn MigratorQuitHandleFunc) OnMigratorQuitHandleFunc(migrator *Migrator) {
fn(migrator)
}
// MigratorNotifyHandleFunc is exported
type MigratorNotifyHandleFunc func(migrator *Migrator, err error)
// OnMigratorNotifyHandleFunc is exported
func (fn MigratorNotifyHandleFunc) OnMigratorNotifyHandleFunc(migrator *Migrator, err error) {
fn(migrator, err)
}
// MigrateContainersCache is exported
type MigrateContainersCache struct {
sync.RWMutex
MigratorHandler
Cluster *Cluster
migrateDelay time.Duration
migrators map[string]*Migrator
}
// NewMigrateContainersCache is exported
func NewMigrateContainersCache(migrateDelay time.Duration) *MigrateContainersCache {
return &MigrateContainersCache{
migrateDelay: migrateDelay,
migrators: make(map[string]*Migrator),
}
}
// SetCluster is exported
func (cache *MigrateContainersCache) SetCluster(cluster *Cluster) {
cache.Cluster = cluster
}
// Contains is exported
func (cache *MigrateContainersCache) Contains(metaid string) bool {
cache.RLock()
defer cache.RUnlock()
_, ret := cache.migrators[metaid]
return ret
}
// RemoveGroup is exported
// cancel group all metadata migrate.
func (cache *MigrateContainersCache) RemoveGroup(groupid string) {
cache.RLock()
groupMetaData := cache.Cluster.configCache.GetGroupMetaData(groupid)
for _, metaData := range groupMetaData {
if migrator, ret := cache.migrators[metaData.MetaID]; ret {
migrator.Clear()
logger.INFO("[#cluster] migrator clear %s", migrator.MetaID)
}
}
cache.RUnlock()
}
// Start is exported
// engine offline, start migrate containers.
// engine parameter is offline engine pointer.
func (cache *MigrateContainersCache) Start(engine *Engine) {
if engine.IsHealthy() {
metaids := engine.MetaIds()
cache.start(engine, metaids)
}
}
// Cancel is exported
// engine online, cancel migrate containers of state is MigrateReady.
// engine parameter is online engine pointer.
func (cache *MigrateContainersCache) Cancel(engine *Engine) {
if engine.IsHealthy() {
metaids := engine.MetaIds()
cache.cancel(engine, metaids)
}
}
func (cache *MigrateContainersCache) start(engine *Engine, metaids []string) {
if len(metaids) > 0 {
cache.Lock()
for _, metaid := range metaids {
containers := engine.Containers(metaid)
if len(containers) == 0 {
continue
}
migrator, ret := cache.migrators[metaid]
if !ret {
migrator = NewMigrator(metaid, containers, cache.Cluster, cache.migrateDelay, cache)
cache.migrators[metaid] = migrator
logger.INFO("[#cluster] migrator start %s %s", engine.IP, metaid)
go migrator.Start()
} else {
logger.INFO("[#cluster] migrator update %s %s", engine.IP, metaid)
migrator.Update(metaid, containers)
}
}
cache.Unlock()
}
}
func (cache *MigrateContainersCache) cancel(engine *Engine, metaids []string) {
if len(metaids) > 0 {
cache.RLock()
waitgroup := sync.WaitGroup{}
for _, metaid := range metaids {
if migrator, ret := cache.migrators[metaid]; ret {
containers := engine.Containers(metaid)
if len(containers) == 0 {
continue
}
waitgroup.Add(1)
go func(id string, c Containers) {
defer waitgroup.Done()
logger.INFO("[#cluster] migrator cancel %s %s", engine.IP, id)
migrator.Cancel(id, c)
}(metaid, containers)
}
}
waitgroup.Wait()
cache.RUnlock()
}
}
// OnMigratorQuitHandleFunc is exported
func (cache *MigrateContainersCache) OnMigratorQuitHandleFunc(migrator *Migrator) {
logger.INFO("[#cluster] migrator quited %s", migrator.MetaID)
cache.Lock()
delete(cache.migrators, migrator.MetaID)
cache.Unlock()
}
// OnMigratorNotifyHandleFunc is exported
func (cache *MigrateContainersCache) OnMigratorNotifyHandleFunc(migrator *Migrator, err error) {
logger.INFO("[#cluster] migrator notify %s", migrator.MetaID)
metaData := cache.Cluster.GetMetaData(migrator.MetaID)
cache.Cluster.submitHookEvent(metaData, MigrateMetaEvent)
cache.Cluster.NotifyGroupMetaContainersEvent("Cluster Meta Containers Migrated.", err, migrator.MetaID)
mContainers := migrator.Containers()
for _, mContainer := range mContainers {
logger.INFO("[#cluster] migrator container %s %s", ShortContainerID(mContainer.ID), mContainer.state.String())
}
}