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cluster.go
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cluster.go
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package asyncp
import (
"context"
"errors"
"log"
"os"
"strings"
"sync"
"time"
"go.uber.org/multierr"
"github.com/demdxx/asyncp/v2/monitor"
)
const (
clusterDefaultSyncInterval = time.Second * 10
)
var (
// ErrNoSyncInformation in case if cant get access to sync information
ErrNoSyncInformation = errors.New("no information for sync")
)
// ClusterOption provides option extractor for the cluster configuration
type ClusterOption = func(cluster *Cluster)
// ClusterWithHostinfo puts hostname information
func ClusterWithHostinfo(hostIP, hostname string) ClusterOption {
return func(cluster *Cluster) {
cluster.hostIP = hostIP
cluster.hostname = hostname
}
}
// ClusterWithSyncInterval between exec graph refresh
func ClusterWithSyncInterval(syncInterval time.Duration) ClusterOption {
return func(cluster *Cluster) {
cluster.syncInterval = syncInterval
}
}
// ClusterWithReader of the culter info
func ClusterWithReader(infoReader monitor.ClusterInfoReader) ClusterOption {
return func(cluster *Cluster) {
cluster.infoReader = infoReader
}
}
// ClusterWithStores between exec graph refresh
func ClusterWithStores(stores ...monitor.MetricUpdater) ClusterOption {
return func(cluster *Cluster) {
cluster.clusterStores = stores
}
}
// ClusterExt extends functionality of mux
type ClusterExt interface {
RegisterApplication(ctx context.Context, mux *TaskMux) error
UnregisterApplication() error
ReceiveEvent(event Event, err error) error
ExecEvent(failover bool, event Event, execTime time.Duration, err error) error
TargetEventsAfter(eventName string) []string
AllTasks() map[string][]string
AllTaskChains() map[string][]string
}
// Cluster provides synchronization of several processing pools
// and join all processing graphs in one cross-service execution map.
type Cluster struct {
mx sync.RWMutex
appName string
hostIP string
hostname string
// interval of cluster infor updating
syncInterval time.Duration
tickInterval *time.Ticker
infoReader monitor.ClusterInfoReader
clusterStores []monitor.MetricUpdater
taskMap map[string][]string
appInfo *monitor.ApplicationInfo
mux *TaskMux
}
// NewCluster graph synchronization
func NewCluster(appName string, options ...ClusterOption) *Cluster {
cluster := &Cluster{
appName: appName,
syncInterval: clusterDefaultSyncInterval,
}
for _, opt := range options {
opt(cluster)
}
if cluster.syncInterval <= 0 {
cluster.syncInterval = clusterDefaultSyncInterval
}
if cluster.hostIP == "" {
cluster.hostIP = localIP()
}
if cluster.hostname == "" {
cluster.hostname, _ = os.Hostname()
}
if cluster.infoReader == nil && len(cluster.clusterStores) == 0 {
panic("monitor.ClusterInfoReader or monitor.MetricUpdater is required for synchronisation")
}
return cluster
}
// RegisterApplication in iternal storages
func (cluster *Cluster) RegisterApplication(ctx context.Context, mux *TaskMux) (err error) {
if cluster == nil {
return nil
}
cluster.mux = mux
appInfo := &monitor.ApplicationInfo{
Name: cluster.appName,
Host: cluster.hostIP,
Hostname: cluster.hostname,
Tasks: mux.TaskMap(),
}
for _, up := range cluster.clusterStores {
if regErr := up.RegisterApplication(appInfo); regErr != nil {
err = multierr.Append(err, regErr)
}
}
go cluster.RunSync(ctx)
return err
}
// UnregisterApplication from cluster
func (cluster *Cluster) UnregisterApplication() (err error) {
if cluster == nil {
return nil
}
for _, st := range cluster.clusterStores {
err = multierr.Append(err, st.DeregisterApplication())
}
cluster.StopSync()
return err
}
// ReceiveEvent handler before it was executed
func (cluster *Cluster) ReceiveEvent(event Event, err error) error {
if cluster == nil {
return nil
}
targetEvent := monitor.EventType(event)
if event == nil {
targetEvent = monitor.NewErrorEvent(err)
} else if err != nil {
targetEvent = event.WithError(err)
}
var resErr error
for _, st := range cluster.clusterStores {
resErr = multierr.Append(resErr, st.ReceiveEvent(targetEvent))
}
return resErr
}
// ExecEvent handler after event has been executed
func (cluster *Cluster) ExecEvent(failover bool, event Event, execTime time.Duration, err error) error {
if cluster == nil {
return nil
}
targetEvent := monitor.EventType(event)
if event == nil {
targetEvent = monitor.NewErrorEvent(err)
} else if err != nil {
targetEvent = event.WithError(err)
}
var resErr error
for _, up := range cluster.clusterStores {
if failover {
resErr = multierr.Append(resErr, up.ExecuteFailoverTask(targetEvent, execTime))
} else {
resErr = multierr.Append(resErr, up.ExecuteTask(targetEvent, execTime))
}
}
return resErr
}
// TargetEventsAfter returns list of events to execute after the current event
func (cluster *Cluster) TargetEventsAfter(eventName string) []string {
cluster.mx.RLock()
defer cluster.mx.RUnlock()
if cluster.taskMap == nil {
return nil
}
return cluster.taskMap[eventName]
}
// AllTasks returns all events and links
func (cluster *Cluster) AllTasks() map[string][]string {
cluster.mx.RLock()
defer cluster.mx.RUnlock()
if cluster.appInfo == nil {
return nil
}
return cluster.appInfo.Tasks
}
// AllTaskChains returns all events task chains
// TODO: revise the way of tasks information representation
func (cluster *Cluster) AllTaskChains() map[string][]string {
var (
tasks = cluster.AllTasks()
chains = map[string][]string{}
canContinue = true
)
for k, v := range tasks {
chains[k] = append(make([]string, 0, len(v)), v...)
}
mainLoop:
for canContinue && len(chains) > 0 {
for k, v := range chains {
canContinue = false
for _, key := range v {
if len(chains[key]) > 0 {
chains[k] = mergeStrArr(chains[k], append(v, chains[key]...))
canContinue = true
}
delete(chains, key)
}
for _, key := range v {
key = "@" + key
if len(chains[key]) > 0 {
chains[k] = mergeStrArr(chains[k], append(v, chains[key]...))
canContinue = true
}
delete(chains, key)
}
for _, key := range []string{strings.TrimLeft(k, "@"), "@" + strings.TrimLeft(k, "@")} {
if len(chains[key]) > 0 {
pSize := len(chains[k])
chains[k] = mergeStrArr(chains[k], append(v, chains[key]...))
if pSize != len(chains[k]) {
canContinue = true
}
}
}
if canContinue {
continue mainLoop
}
}
}
return chains
}
// RunSync of cluster information
func (cluster *Cluster) RunSync(ctx context.Context) {
if cluster.infoReader == nil {
return
}
cluster.StopSync()
defer cluster.StopSync()
cluster.mx.Lock()
cluster.tickInterval = time.NewTicker(cluster.syncInterval)
tickChan := cluster.tickInterval.C
cluster.mx.Unlock()
for {
select {
case _, ok := <-tickChan:
if !ok {
return
}
if err := cluster.SyncInfo(); err != nil {
log.Print(err)
}
case <-ctx.Done():
return
}
}
}
// StopSync interval processing
func (cluster *Cluster) StopSync() {
cluster.mx.Lock()
defer cluster.mx.Unlock()
if cluster.tickInterval != nil {
cluster.tickInterval.Stop()
cluster.tickInterval = nil
}
}
// SyncInfo of the cluster
func (cluster *Cluster) SyncInfo() error {
if cluster.infoReader == nil {
return nil
}
appInfo, err := cluster.infoReader.ApplicationInfo()
if err != nil {
return err
}
cluster.appInfo = &monitor.ApplicationInfo{}
if appInfo == nil {
return ErrNoSyncInformation
}
cluster.appInfo.Merge(appInfo)
if appInfo.Tasks != nil {
cluster.mx.Lock()
defer cluster.mx.Unlock()
cluster.taskMap = map[string][]string{}
for k, v := range cluster.appInfo.Tasks {
cluster.taskMap[k] = append([]string{}, v...)
}
}
return nil
}