2019-09-14 06:33:14 +02:00
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package runtime
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import (
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"errors"
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2019-11-02 15:25:10 +02:00
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"fmt"
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"strconv"
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2019-09-14 06:33:14 +02:00
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"sync"
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"time"
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"github.com/micro/go-micro/util/log"
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)
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type runtime struct {
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sync.RWMutex
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2019-11-02 15:25:10 +02:00
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// options configure runtime
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options Options
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2019-09-14 17:07:36 +02:00
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// used to stop the runtime
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closed chan bool
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// used to start new services
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start chan *service
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// indicates if we're running
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running bool
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// the service map
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2019-09-14 06:33:14 +02:00
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services map[string]*service
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}
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2019-11-02 15:25:10 +02:00
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// NewRuntime creates new local runtime and returns it
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func NewRuntime(opts ...Option) Runtime {
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// get default options
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options := Options{}
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2019-09-14 06:33:14 +02:00
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2019-11-02 15:25:10 +02:00
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// apply requested options
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for _, o := range opts {
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o(&options)
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}
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2019-09-14 06:33:14 +02:00
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return &runtime{
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2019-11-02 15:25:10 +02:00
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options: options,
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2019-09-14 06:33:14 +02:00
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closed: make(chan bool),
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start: make(chan *service, 128),
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services: make(map[string]*service),
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}
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}
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2019-11-02 15:25:10 +02:00
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// Init initializes runtime options
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func (r *runtime) Init(opts ...Option) error {
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r.Lock()
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defer r.Unlock()
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2019-11-02 15:25:10 +02:00
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for _, o := range opts {
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o(&r.options)
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2019-09-14 06:33:14 +02:00
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}
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return nil
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}
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2019-11-02 15:25:10 +02:00
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// run runs the runtime management loop
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func (r *runtime) run(events <-chan Event) {
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t := time.NewTicker(time.Second * 5)
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defer t.Stop()
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for {
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select {
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case <-t.C:
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// check running services
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r.RLock()
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for _, service := range r.services {
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if service.Running() {
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continue
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}
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// TODO: check service error
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log.Debugf("Runtime starting %s", service.Name)
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if err := service.Start(); err != nil {
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log.Debugf("Runtime error starting %s: %v", service.Name, err)
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}
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}
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r.RUnlock()
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case service := <-r.start:
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if service.Running() {
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continue
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}
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// TODO: check service error
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log.Debugf("Runtime starting service %s", service.Name)
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if err := service.Start(); err != nil {
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log.Debugf("Runtime error starting service %s: %v", service.Name, err)
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}
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case event := <-events:
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log.Debugf("Runtime received notification event: %v", event)
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// NOTE: we only handle Update events for now
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switch event.Type {
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case Update:
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// parse returned response to timestamp
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updateTimeStamp, err := strconv.ParseInt(event.Version, 10, 64)
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if err != nil {
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log.Debugf("Runtime error parsing update build time: %v", err)
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continue
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}
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buildTime := time.Unix(updateTimeStamp, 0)
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processEvent := func(event Event, service *Service) error {
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buildTimeStamp, err := strconv.ParseInt(service.Version, 10, 64)
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if err != nil {
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return err
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}
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muBuild := time.Unix(buildTimeStamp, 0)
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if buildTime.After(muBuild) {
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if err := r.Update(service); err != nil {
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return err
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}
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service.Version = fmt.Sprintf("%d", buildTime.Unix())
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}
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return nil
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}
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r.Lock()
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if len(event.Service) > 0 {
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service, ok := r.services[event.Service]
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if !ok {
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log.Debugf("Runtime unknown service: %s", event.Service)
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r.Unlock()
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continue
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}
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if err := processEvent(event, service.Service); err != nil {
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log.Debugf("Runtime error updating service %s: %v", event.Service, err)
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}
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r.Unlock()
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continue
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}
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// if blank service was received we update all services
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for _, service := range r.services {
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if err := processEvent(event, service.Service); err != nil {
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log.Debugf("Runtime error updating service %s: %v", service.Name, err)
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}
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}
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r.Unlock()
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}
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case <-r.closed:
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log.Debugf("Runtime stopped.")
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return
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}
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}
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}
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// Create creates a new service which is then started by runtime
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func (r *runtime) Create(s *Service, opts ...CreateOption) error {
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r.Lock()
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defer r.Unlock()
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if _, ok := r.services[s.Name]; ok {
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return errors.New("service already registered")
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}
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2019-09-24 19:32:35 +02:00
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var options CreateOptions
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for _, o := range opts {
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o(&options)
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}
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if len(s.Exec) == 0 && len(options.Command) == 0 {
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return errors.New("missing exec command")
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}
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// save service
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r.services[s.Name] = newService(s, options)
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2019-09-14 17:07:36 +02:00
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// push into start queue
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r.start <- r.services[s.Name]
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2019-09-14 06:33:14 +02:00
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return nil
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}
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2019-11-02 15:25:10 +02:00
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// Delete removes the service from the runtime and stops it
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func (r *runtime) Delete(s *Service) error {
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r.Lock()
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defer r.Unlock()
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if s, ok := r.services[s.Name]; ok {
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delete(r.services, s.Name)
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return s.Stop()
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}
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return nil
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}
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2019-11-02 15:25:10 +02:00
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// Update attemps to update the service
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func (r *runtime) Update(s *Service) error {
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// delete the service
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if err := r.Delete(s); err != nil {
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return err
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}
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// create new service
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return r.Create(s)
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}
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// List returns a slice of all services tracked by the runtime
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func (r *runtime) List() ([]*Service, error) {
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var services []*Service
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r.RLock()
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defer r.RUnlock()
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for _, service := range r.services {
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services = append(services, service.Service)
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}
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return services, nil
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}
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// Start starts the runtime
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func (r *runtime) Start() error {
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r.Lock()
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defer r.Unlock()
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// already running
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if r.running {
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return nil
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}
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// set running
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r.running = true
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r.closed = make(chan bool)
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2019-09-14 17:07:36 +02:00
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2019-11-02 15:25:10 +02:00
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var events <-chan Event
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if r.options.Notifier != nil {
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var err error
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events, err = r.options.Notifier.Notify()
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if err != nil {
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// TODO: should we bail here?
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log.Debugf("Runtime failed to start update notifier")
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}
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}
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go r.run(events)
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2019-09-14 06:33:14 +02:00
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return nil
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}
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2019-11-02 15:25:10 +02:00
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// Stop stops the runtime
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func (r *runtime) Stop() error {
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r.Lock()
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defer r.Unlock()
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if !r.running {
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return nil
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}
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select {
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case <-r.closed:
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return nil
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default:
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close(r.closed)
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// set not running
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r.running = false
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// stop all the services
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for _, service := range r.services {
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log.Debugf("Runtime stopping %s", service.Name)
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service.Stop()
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}
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// stop the notifier too
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if r.options.Notifier != nil {
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return r.options.Notifier.Close()
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}
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}
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return nil
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}
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// String implements stringer interface
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func (r *runtime) String() string {
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return "local"
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}
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