Support adding streams on the fly

cmd/api/api.go

@@ -83,7 +83,7 @@ func fileServerHandlder(w http.ResponseWriter, r *http.Request) {
 
 func statsHandler(w http.ResponseWriter, _ *http.Request) {
 	v := map[string]interface{}{
-		"streams": streams.Streams,
+		"streams": streams.All(),
 	}
 	data, err := json.Marshal(v)
 	if err != nil {

cmd/hass/hass.go

@@ -79,7 +79,7 @@ func handler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	stream := streams.NewStream(url)
+	stream := streams.Get(url)
 	str, err = webrtc.ExchangeSDP(stream, string(offer), r.UserAgent())
 	if err != nil {
 		log.Error().Err(err).Msg("[api.hass] exchange SDP")

cmd/streams/handlers.go

@@ -17,6 +17,11 @@ func HandleFunc(scheme string, handler Handler) {
 	handlers[scheme] = handler
 }
 
+func HasProducer(url string) bool {
+	i := strings.IndexByte(url, ':')
+	return handlers[url[:i]] != nil
+}
+
 func GetProducer(url string) (streamer.Producer, error) {
 	i := strings.IndexByte(url, ':')
 	handler := handlers[url[:i]]

cmd/streams/stream.go

@@ -120,6 +120,20 @@ func (s *Stream) RemoveProducer(prod streamer.Producer) {
 	panic("not implemented")
 }
 
+func (s *Stream) Active() bool {
+	if len(s.consumers) > 0{
+		return true
+	}
+
+	for _, prod := range s.producers {
+		if prod.element != nil {
+			return true
+		}
+	}
+
+	return false
+}
+
 func (s *Stream) MarshalJSON() ([]byte, error) {
 	var v []interface{}
 	for _, prod := range s.producers {

cmd/streams/streams.go

@@ -5,8 +5,6 @@ import (
 	"github.com/rs/zerolog"
 )
 
-var Streams = map[string]*Stream{}
-
 func Init() {
 	var cfg struct {
 		Mod map[string]interface{} `yaml:"streams"`
@@ -17,12 +15,34 @@ func Init() {
 	log = app.GetLogger("streams")
 
 	for name, item := range cfg.Mod {
-		Streams[name] = NewStream(item)
+		streams[name] = NewStream(item)
 	}
 }
 
 func Get(name string) *Stream {
-	return Streams[name]
+	if stream, ok := streams[name]; ok {
+		return stream
+	}
+
+	if HasProducer(name) {
+		log.Info().Str("url", name).Msg("[streams] create new stream")
+		stream := NewStream(name)
+		streams[name] = stream
+		return stream
+	}
+
+	return nil
+}
+
+func All() map[string]interface{} {
+	active := map[string]interface{}{}
+	for name, stream := range streams {
+		if stream.Active() {
+			active[name] = stream
+		}
+	}
+	return active
 }
 
 var log zerolog.Logger
+var streams = map[string]*Stream{}