Пример #1
0
// NewSubscriberDetailed is the same as NewSubscriber, but allows users to
// provide an explicit lookup refresh ticker instead of a TTL, and specify the
// lookup function instead of using net.LookupSRV.
func NewSubscriberDetailed(
	name string,
	refresh *time.Ticker,
	lookup Lookup,
	factory sd.Factory,
	logger log.Logger,
) *Subscriber {
	p := &Subscriber{
		name:   name,
		cache:  cache.New(factory, logger),
		logger: logger,
		quit:   make(chan struct{}),
	}

	instances, err := p.resolve(lookup)
	if err == nil {
		logger.Log("name", name, "instances", len(instances))
	} else {
		logger.Log("name", name, "err", err)
	}
	p.cache.Update(instances)

	go p.loop(refresh, lookup)
	return p
}
Пример #2
0
// NewSubscriber returns a ZooKeeper subscriber. ZooKeeper will start watching
// the given path for changes and update the Subscriber endpoints.
func NewSubscriber(c Client, path string, factory sd.Factory, logger log.Logger) (*Subscriber, error) {
	s := &Subscriber{
		client: c,
		path:   path,
		cache:  cache.New(factory, logger),
		logger: logger,
		quitc:  make(chan struct{}),
	}

	err := s.client.CreateParentNodes(s.path)
	if err != nil {
		return nil, err
	}

	instances, eventc, err := s.client.GetEntries(s.path)
	if err != nil {
		logger.Log("path", s.path, "msg", "failed to retrieve entries", "err", err)
		return nil, err
	}
	logger.Log("path", s.path, "instances", len(instances))
	s.cache.Update(instances)

	go s.loop(eventc)

	return s, nil
}
Пример #3
0
// NewSubscriber returns an etcd subscriber. It will start watching the given
// prefix for changes, and update the endpoints.
func NewSubscriber(c Client, prefix string, factory sd.Factory, logger log.Logger) (*Subscriber, error) {
	s := &Subscriber{
		client: c,
		prefix: prefix,
		cache:  cache.New(factory, logger),
		logger: logger,
		quitc:  make(chan struct{}),
	}

	instances, err := s.client.GetEntries(s.prefix)
	if err == nil {
		logger.Log("prefix", s.prefix, "instances", len(instances))
	} else {
		logger.Log("prefix", s.prefix, "err", err)
	}
	s.cache.Update(instances)

	go s.loop()
	return s, nil
}
Пример #4
0
// NewSubscriber returns a Consul subscriber which returns endpoints for the
// requested service. It only returns instances for which all of the passed tags
// are present.
func NewSubscriber(client Client, factory sd.Factory, logger log.Logger, service string, tags []string, passingOnly bool) *Subscriber {
	s := &Subscriber{
		cache:       cache.New(factory, logger),
		client:      client,
		logger:      log.NewContext(logger).With("service", service, "tags", fmt.Sprint(tags)),
		service:     service,
		tags:        tags,
		passingOnly: passingOnly,
		quitc:       make(chan struct{}),
	}

	instances, index, err := s.getInstances(defaultIndex, nil)
	if err == nil {
		s.logger.Log("instances", len(instances))
	} else {
		s.logger.Log("err", err)
	}

	s.cache.Update(instances)
	go s.loop(index)
	return s
}