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watcher.go
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watcher.go
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package mdns
import (
"errors"
"strings"
"github.com/micro/go-micro/registry"
"github.com/micro/mdns"
)
type mdnsWatcher struct {
wo registry.WatchOptions
ch chan *mdns.ServiceEntry
exit chan struct{}
}
func (m *mdnsWatcher) Next() (*registry.Result, error) {
for {
select {
case e := <-m.ch:
txt, err := decode(e.InfoFields)
if err != nil {
continue
}
if len(txt.Service) == 0 || len(txt.Version) == 0 {
continue
}
// Filter watch options
// wo.Service: Only keep services we care about
if len(m.wo.Service) > 0 && txt.Service != m.wo.Service {
continue
}
var action string
if e.TTL == 0 {
action = "delete"
} else {
action = "create"
}
service := ®istry.Service{
Name: txt.Service,
Version: txt.Version,
Endpoints: txt.Endpoints,
}
// TODO: don't hardcode .local.
if !strings.HasSuffix(e.Name, "."+service.Name+".local.") {
continue
}
service.Nodes = append(service.Nodes, ®istry.Node{
Id: strings.TrimSuffix(e.Name, "."+service.Name+".local."),
Address: e.AddrV4.String(),
Port: e.Port,
Metadata: txt.Metadata,
})
return ®istry.Result{
Action: action,
Service: service,
}, nil
case <-m.exit:
return nil, errors.New("watcher stopped")
}
}
}
func (m *mdnsWatcher) Stop() {
select {
case <-m.exit:
return
default:
close(m.exit)
}
}