186 lines
3.3 KiB
Go
186 lines
3.3 KiB
Go
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package main
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import (
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"os"
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"sync"
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"time"
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"novit.nc/direktil/pkg/log"
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)
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var (
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services = ServiceRegistry{
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rw: &sync.RWMutex{},
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cond: sync.NewCond(&sync.Mutex{}),
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services: make(map[string]Service),
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statuses: make(map[string]ServiceStatus),
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flags: make(map[string]bool),
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}
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)
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type ServiceStatus int
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const (
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Pending ServiceStatus = iota
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Starting
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Running
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Failed
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Exited
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)
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type ServiceRegistry struct {
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rw *sync.RWMutex
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cond *sync.Cond
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services map[string]Service
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statuses map[string]ServiceStatus
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flags map[string]bool
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started bool
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}
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func (sr *ServiceRegistry) Register(services ...Service) {
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for _, service := range services {
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name := service.GetName()
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if _, ok := sr.services[name]; ok {
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fatalf("duplicated service name: %s", name)
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}
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sr.services[name] = service
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if sr.started {
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go sr.startService(name, service)
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}
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}
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}
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func (sr *ServiceRegistry) Start() {
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initLog.Taintf(log.Info, "starting service registry")
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sr.started = true
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for name, service := range sr.services {
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go sr.startService(name, service)
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}
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}
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func (sr *ServiceRegistry) startService(name string, service Service) {
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sr.Set(name, Pending)
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sr.Wait(service.CanStart)
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sr.Set(name, Starting)
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initLog.Taintf(log.Info, "starting service %s", name)
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if err := service.Run(func() {
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sr.Set(name, Running)
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sr.SetFlag("service:" + name)
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}); err == nil {
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initLog.Taintf(log.OK, "service %s finished.", name)
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sr.Set(name, Exited)
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sr.SetFlag("service:" + name)
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} else {
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initLog.Taintf(log.Error, "service %s failed: %v", name, err)
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sr.Set(name, Failed)
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}
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}
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func (sr *ServiceRegistry) Stop() {
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wg := sync.WaitGroup{}
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wg.Add(len(sr.services))
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for name, service := range sr.services {
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name, service := name, service
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go func() {
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initLog.Taintf(log.Info, "stopping %s", name)
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service.Stop()
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wg.Done()
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}()
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}
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wg.Wait()
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}
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func (sr *ServiceRegistry) Wait(check func() bool) {
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sr.cond.L.Lock()
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defer sr.cond.L.Unlock()
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for {
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if check() {
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return
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}
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sr.cond.Wait()
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}
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}
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func (sr *ServiceRegistry) WaitAll() {
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flags := make([]string, 0, len(sr.services))
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for name, _ := range sr.services {
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flags = append(flags, "service:"+name)
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}
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sr.Wait(sr.HasFlagCond(flags...))
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}
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func (sr *ServiceRegistry) Set(serviceName string, status ServiceStatus) {
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sr.cond.L.Lock()
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sr.rw.Lock()
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defer func() {
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sr.rw.Unlock()
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sr.cond.L.Unlock()
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sr.cond.Broadcast()
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}()
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sr.statuses[serviceName] = status
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}
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func (sr *ServiceRegistry) HasStatus(status ServiceStatus, serviceNames ...string) bool {
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sr.rw.RLock()
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defer sr.rw.RUnlock()
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for _, name := range serviceNames {
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if sr.statuses[name] != status {
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return false
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}
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}
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return true
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}
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func (sr *ServiceRegistry) SetFlag(flag string) {
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sr.cond.L.Lock()
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sr.rw.Lock()
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defer func() {
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sr.rw.Unlock()
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sr.cond.L.Unlock()
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sr.cond.Broadcast()
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}()
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sr.flags[flag] = true
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}
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func (sr *ServiceRegistry) HasFlag(flags ...string) bool {
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sr.rw.RLock()
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defer sr.rw.RUnlock()
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for _, flag := range flags {
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if !sr.flags[flag] {
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return false
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}
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}
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return true
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}
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func (sr *ServiceRegistry) HasFlagCond(flags ...string) func() bool {
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return func() bool {
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return sr.HasFlag(flags...)
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}
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}
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func (sr *ServiceRegistry) WaitPath(path string) {
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for {
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if _, err := os.Stat(path); err == nil {
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break
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}
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time.Sleep(100 * time.Millisecond)
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}
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sr.SetFlag("file:" + path)
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}
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