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default.go
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default.go
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package policy
import (
"fmt"
"github.com/paust-team/pirius/bootstrapping"
"github.com/paust-team/pirius/bootstrapping/topic"
"github.com/paust-team/pirius/constants"
"github.com/paust-team/pirius/helper"
"github.com/paust-team/pirius/logger"
"github.com/paust-team/pirius/qerror"
"go.uber.org/zap"
"math/rand"
"sync"
"time"
)
type Flushable interface {
Flush() error
}
type Executor interface {
OnPublisherAdded(id string, topicName string, host string) error
OnPublisherRemoved(id string, topicName string) error
OnSubscriberAdded(id string, topicName string) error
OnSubscriberRemoved(id string, topicName string) error
}
type FlushableExecutor interface {
Flushable
Executor
}
type flusher struct {
bootstrapper *bootstrapping.BootstrapService
mu sync.Mutex
topicFragmentsMap map[string]topic.FragMappingInfo
subscriptionInfoMap map[string]topic.SubscriptionInfo
}
func (e *flusher) GetTopicFragmentMappings(topicName string) (topic.FragMappingInfo, error) {
e.mu.Lock()
defer e.mu.Unlock()
if e.topicFragmentsMap[topicName] != nil {
return e.topicFragmentsMap[topicName], nil
}
topicFragments, err := e.bootstrapper.GetTopicFragments(topicName)
if err != nil {
return nil, err
}
return topicFragments.FragMappingInfo(), nil
}
func (e *flusher) UpdateTopicFragments(topicName string, fragMappings topic.FragMappingInfo) {
e.mu.Lock()
defer e.mu.Unlock()
if e.topicFragmentsMap == nil {
e.topicFragmentsMap = make(map[string]topic.FragMappingInfo)
}
e.topicFragmentsMap[topicName] = fragMappings
}
func (e *flusher) GetSubscriptionMappings(topicName string) (topic.SubscriptionInfo, error) {
e.mu.Lock()
defer e.mu.Unlock()
if e.subscriptionInfoMap[topicName] != nil {
return e.subscriptionInfoMap[topicName], nil
}
topicSubscriptions, err := e.bootstrapper.GetTopicSubscriptions(topicName)
if err != nil {
return nil, err
}
return topicSubscriptions.SubscriptionInfo(), nil
}
func (e *flusher) UpdateSubscriptionMappings(topicName string, subscriptionMappings topic.SubscriptionInfo) {
e.mu.Lock()
defer e.mu.Unlock()
if e.subscriptionInfoMap == nil {
e.subscriptionInfoMap = make(map[string]topic.SubscriptionInfo)
}
e.subscriptionInfoMap[topicName] = subscriptionMappings
}
// Flush : flush subscription info and fragment mappings into zk
// this is safe because only master broker do rebalance process
func (e *flusher) Flush() error {
e.mu.Lock()
defer e.mu.Unlock()
if e.topicFragmentsMap != nil {
for topicName, fragMappings := range e.topicFragmentsMap {
topicFragmentFrame := topic.NewTopicFragmentsFrame(fragMappings)
if err := e.bootstrapper.UpdateTopicFragments(topicName, topicFragmentFrame); err != nil {
return err
}
logger.Info("updated fragment mappings flushed", zap.String("topic", topicName))
logger.Debug(fmt.Sprintf("fragments-mappings: %#v\n", fragMappings))
time.Sleep(100 * time.Millisecond) // for slowdown watch propagation
}
}
if e.subscriptionInfoMap != nil {
for topicName, subscriptionMappings := range e.subscriptionInfoMap {
subscriptionFrame := topic.NewTopicSubscriptionsFrame(subscriptionMappings)
if err := e.bootstrapper.UpdateTopicSubscriptions(topicName, subscriptionFrame); err != nil {
return err
}
logger.Info("updated subscription info flushed", zap.String("topic", topicName))
logger.Debug(fmt.Sprintf("subscription-mappings: %#v\n", subscriptionMappings))
time.Sleep(100 * time.Millisecond) // for slowdown watch propagation
}
}
e.topicFragmentsMap = nil
e.subscriptionInfoMap = nil
return nil
}
type DefaultPolicyExecutor struct {
Executor
flusher
}
func NewDefaultPolicyExecutor(bootstrapper *bootstrapping.BootstrapService) *DefaultPolicyExecutor {
return &DefaultPolicyExecutor{
flusher: flusher{
bootstrapper: bootstrapper,
mu: sync.Mutex{},
},
}
}
// OnPublisherAdded : when a publisher connects, it either sets the fragment active or adds a new one
// then add newly active fragments to each subscription equally
func (e *DefaultPolicyExecutor) OnPublisherAdded(id string, topicName string, host string) error {
lock := e.bootstrapper.NewTopicLock(topicName)
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
fragMappings, err := e.GetTopicFragmentMappings(topicName)
if err != nil {
return err
}
pubsFragmentIds, err := getFragmentsToPublish(e.bootstrapper.CoordClientTopicWrapper, topicName, id, fragMappings)
if err != nil {
return err
}
for _, fragmentId := range pubsFragmentIds {
fragMappings[fragmentId] = topic.FragInfo{
State: topic.Active,
PublisherId: id,
Address: host,
}
}
e.UpdateTopicFragments(topicName, fragMappings)
logger.Info("update fragments to active state", zap.String("topic", topicName), zap.Uints("fragments", pubsFragmentIds))
// update subscription info
subscribers, err := e.bootstrapper.GetSubscribers(topicName)
if err != nil {
return err
}
subscriptionMappings, err := e.GetSubscriptionMappings(topicName)
if err != nil {
return err
}
once := sync.Once{}
var newSubsFragmentIds []uint
for _, subscriberId := range subscribers {
// in default rule, all subscribers must have same fragment assignment
once.Do(func() {
newSubsFragmentIds = subscriptionMappings[subscriberId]
for _, fragmentId := range pubsFragmentIds { // include newly active pubs fragments
if !helper.IsContains(fragmentId, subscriptionMappings[subscriberId]) {
newSubsFragmentIds = append(newSubsFragmentIds, fragmentId)
}
}
})
subscriptionMappings[subscriberId] = newSubsFragmentIds
}
e.UpdateSubscriptionMappings(topicName, subscriptionMappings)
logger.Info("update subscription info", zap.String("topic", topicName))
return nil
}
// OnPublisherRemoved : when a publisher is disconnected, set fragment as inactive and remove fragments from subscriptions
func (e *DefaultPolicyExecutor) OnPublisherRemoved(id string, topicName string) error {
lock := e.bootstrapper.NewTopicLock(topicName)
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
fragMappings, err := e.GetTopicFragmentMappings(topicName)
if err != nil {
return err
}
pubsFragmentIds, err := findPublisherFragments(e.bootstrapper.CoordClientTopicWrapper, topicName, id)
if err != nil {
return err
}
for _, fragmentId := range pubsFragmentIds {
fragMappings[fragmentId] = topic.FragInfo{
State: topic.Inactive,
PublisherId: id,
Address: "",
}
}
e.UpdateTopicFragments(topicName, fragMappings)
logger.Info("update fragments to inactive state", zap.String("topic", topicName), zap.Uints("fragments", pubsFragmentIds))
// update subscription info
subscriptionMappings, err := e.GetSubscriptionMappings(topicName)
if err != nil {
return err
}
once := sync.Once{}
var newSubsFragmentIds []uint
for subscriberId, subsFragmentIds := range subscriptionMappings {
// in default rule, all subscribers must have same fragment assignment
once.Do(func() {
for _, fragmentId := range subsFragmentIds {
if !helper.IsContains(fragmentId, pubsFragmentIds) { // exclude inactive pubs fragments
newSubsFragmentIds = append(newSubsFragmentIds, fragmentId)
}
}
})
subscriptionMappings[subscriberId] = newSubsFragmentIds
}
e.UpdateSubscriptionMappings(topicName, subscriptionMappings)
logger.Info("update subscription info", zap.String("topic", topicName))
return nil
}
// OnSubscriberAdded : when a subscriber connected, create new subscription for it and assign all fragments of topic.
func (e *DefaultPolicyExecutor) OnSubscriberAdded(id string, topicName string) error {
lock := e.bootstrapper.NewTopicLock(topicName)
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
fragMappings, err := e.GetTopicFragmentMappings(topicName)
if err != nil {
return err
}
var allFragmentIds []uint
for fragmentId, info := range fragMappings {
if info.State == topic.Active {
allFragmentIds = append(allFragmentIds, fragmentId)
}
}
// update subscription info
subscriptionMappings, err := e.GetSubscriptionMappings(topicName)
if err != nil {
return err
}
if helper.HasAllElements(allFragmentIds, subscriptionMappings[id]) {
logger.Info("skip assign subscription of subscriber",
zap.String("topic", topicName),
zap.String("subscriber", id),
zap.Int("num-active-fragments", len(allFragmentIds)))
return nil
}
subscriptionMappings[id] = allFragmentIds // assign new subscription for added subscriber
e.UpdateSubscriptionMappings(topicName, subscriptionMappings)
logger.Info("add subscription of subscriber", zap.String("topic", topicName), zap.String("subscriber", id))
return nil
}
// OnSubscriberRemoved : when a subscriber disconnected, just delete subscription of it.
func (e *DefaultPolicyExecutor) OnSubscriberRemoved(id string, topicName string) error {
lock := e.bootstrapper.NewTopicLock(topicName)
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
subscriptionMappings, err := e.GetSubscriptionMappings(topicName)
if err != nil {
return err
}
delete(subscriptionMappings, id) // remove a subscription of removed subscriber
e.UpdateSubscriptionMappings(topicName, subscriptionMappings)
logger.Info("remove subscription of subscriber", zap.String("topic", topicName), zap.String("subscriber", id))
return nil
}
// getAssignableFragmentId : find not assigned fragment id
func getAssignableFragmentId(topicName string, existingFragments topic.FragMappingInfo) (uint, error) {
if len(existingFragments) == constants.MaxFragmentCount {
return 0, qerror.InvalidStateError{State: fmt.Sprintf("fragment for topic(%s) is full", topicName)}
}
var newFragmentId uint
for {
newFragmentId = uint(rand.Intn(constants.MaxFragmentCount) + 1)
if _, ok := existingFragments[newFragmentId]; !ok {
break
}
}
return newFragmentId, nil
}
// findPublisherFragments : find fragment info through topic-fragment discovery
func findPublisherFragments(topicCoord topic.CoordClientTopicWrapper, topicName string, publisherId string) (fragmentIds []uint, err error) {
topicFragmentFrame, err := topicCoord.GetTopicFragments(topicName)
if err != nil {
return nil, err
}
fragMappings := topicFragmentFrame.FragMappingInfo()
for fragId, fragInfo := range fragMappings {
if fragInfo.PublisherId == publisherId {
fragmentIds = append(fragmentIds, fragId)
}
}
if len(fragmentIds) == 0 {
return nil, qerror.TargetNotExistError{Target: fmt.Sprintf("fragments of topic(%s)", topicName)}
}
return
}
// getFragmentsToPublish : get fragments to publish for publisher
func getFragmentsToPublish(topicCoord topic.CoordClientTopicWrapper, topicName string, publisherId string, fragMappings topic.FragMappingInfo) (fragmentIds []uint, err error) {
pubsFragmentIds, err := findPublisherFragments(topicCoord, topicName, publisherId)
if err != nil {
// if new publisher, assign new fragment id
if _, ok := err.(qerror.TargetNotExistError); ok {
newFragmentId, err := getAssignableFragmentId(topicName, fragMappings)
if err != nil {
return nil, err
}
pubsFragmentIds = []uint{newFragmentId}
} else {
return pubsFragmentIds, nil
}
}
return pubsFragmentIds, nil
}