71 lines
1.0 KiB
Go
71 lines
1.0 KiB
Go
package emlid
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import (
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"net"
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"sync"
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"time"
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"github.com/oleksandr/bonjour"
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)
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// Service is a ReachRS service discovered via MDNS-SD
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type Service struct {
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Name string
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AddrV4 net.IP
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Port int
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}
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// Discover tries to discover ReachRS services on the local network via MDNS-SD
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func Discover(timeout time.Duration) ([]Service, error) {
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var wg sync.WaitGroup
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wg.Add(1)
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resolver, err := bonjour.NewResolver(nil)
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if err != nil {
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return nil, err
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}
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services := make([]Service, 0)
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entries := make(chan *bonjour.ServiceEntry)
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timer := time.NewTimer(timeout)
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defer timer.Stop()
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stop := func() {
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resolver.Exit <- true
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wg.Done()
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}
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go func() {
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for {
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select {
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case e, ok := <-entries:
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if !ok {
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stop()
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return
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}
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services = append(services, Service{
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Name: e.Instance,
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AddrV4: e.AddrIPv4,
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Port: e.Port,
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})
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case <-timer.C:
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stop()
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return
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}
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}
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}()
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if err = resolver.Browse("_reach._tcp", ".local", entries); err != nil {
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return nil, err
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}
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wg.Wait()
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return services, nil
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}
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