micro/registry/memory/watcher.go

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package memory
import (
"errors"
"github.com/micro/go-micro/v3/registry"
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)
type Watcher struct {
id string
wo registry.WatchOptions
res chan *registry.Result
exit chan bool
}
func (m *Watcher) Next() (*registry.Result, error) {
for {
select {
case r := <-m.res:
if r.Service == nil {
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continue
}
if len(m.wo.Service) > 0 && m.wo.Service != r.Service.Name {
continue
}
// extract domain from service metadata
var domain string
if r.Service.Metadata != nil && len(r.Service.Metadata["domain"]) > 0 {
domain = r.Service.Metadata["domain"]
} else {
domain = registry.DefaultDomain
}
// only send the event if watching the wildcard or this specific domain
if m.wo.Domain == registry.WildcardDomain || m.wo.Domain == domain {
return r, nil
}
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case <-m.exit:
return nil, errors.New("watcher stopped")
}
}
}
func (m *Watcher) Stop() {
select {
case <-m.exit:
return
default:
close(m.exit)
}
}