Move memory to gossip since that's what it is

watch.go

@@ -0,0 +1,47 @@
+package gossip
+
+import (
+	"errors"
+
+	"github.com/micro/go-micro/registry"
+)
+
+type gossipWatcher struct {
+	next chan *registry.Result
+	stop chan bool
+}
+
+func newGossipWatcher(ch chan *registry.Result, exit chan bool) (registry.Watcher, error) {
+	stop := make(chan bool)
+
+	go func() {
+		<-stop
+		close(exit)
+	}()
+
+	return &gossipWatcher{
+		next: ch,
+		stop: stop,
+	}, nil
+}
+
+func (m *gossipWatcher) Next() (*registry.Result, error) {
+	select {
+	case r, ok := <-m.next:
+		if !ok {
+			return nil, errors.New("result chan closed")
+		}
+		return r, nil
+	case <-m.stop:
+		return nil, errors.New("watcher stopped")
+	}
+}
+
+func (m *gossipWatcher) Stop() {
+	select {
+	case <-m.stop:
+		return
+	default:
+		close(m.stop)
+	}
+}