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go-micro/registry/mdns_watcher.go

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