micro/router/registry/watcher.go

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package registry
import (
"sync"
"github.com/micro/go-micro/v3/router"
)
// tableWatcher implements routing table Watcher
type tableWatcher struct {
sync.RWMutex
id string
opts router.WatchOptions
resChan chan *router.Event
done chan struct{}
}
// Next returns the next noticed action taken on table
// TODO: right now we only allow to watch particular service
func (w *tableWatcher) Next() (*router.Event, error) {
for {
select {
case res := <-w.resChan:
switch w.opts.Service {
case res.Route.Service, "*":
return res, nil
default:
continue
}
case <-w.done:
return nil, router.ErrWatcherStopped
}
}
}
// Chan returns watcher events channel
func (w *tableWatcher) Chan() (<-chan *router.Event, error) {
return w.resChan, nil
}
// Stop stops routing table watcher
func (w *tableWatcher) Stop() {
w.Lock()
defer w.Unlock()
select {
case <-w.done:
return
default:
close(w.done)
}
}