Initial upload

fcast/discovery.go

@@ -0,0 +1,57 @@
+package fcast
+
+import (
+	"github.com/hashicorp/mdns"
+	"log"
+)
+
+type DiscoveredHost struct {
+	Name string
+	IPv4 string
+	IPv6 string
+}
+
+func Discover() ([]DiscoveredHost, error) {
+
+	entriesCh := make(chan *mdns.ServiceEntry)
+	var discoveredHosts []DiscoveredHost
+
+	go func() {
+		for entry := range entriesCh {
+			if !validateEntry(entry) {
+				continue
+			}
+			discoveredHosts = append(discoveredHosts, DiscoveredHost{
+				Name: entry.Name,
+				IPv4: entry.AddrV4.String(),
+				IPv6: entry.AddrV6.String(),
+			})
+		}
+	}()
+
+	done := make(chan struct{})
+	go func() {
+		err := mdns.Lookup("_fcast._tcp", entriesCh)
+		if err != nil {
+			log.Println("[ERROR] mdns: lookup error:", err)
+		}
+		close(entriesCh)
+		close(done)
+	}()
+
+	select {
+	case <-done:
+		return discoveredHosts, nil
+	}
+
+}
+
+func validateEntry(entry *mdns.ServiceEntry) bool {
+
+	if entry.Port != DefaultPort {
+		return false
+	}
+
+	return true
+
+}