Move cmd module to internal

internal/streams/handlers.go

@@ -0,0 +1,41 @@
+package streams
+
+import (
+	"fmt"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"strings"
+	"sync"
+)
+
+type Handler func(url string) (core.Producer, error)
+
+var handlers = map[string]Handler{}
+var handlersMu sync.Mutex
+
+func HandleFunc(scheme string, handler Handler) {
+	handlersMu.Lock()
+	handlers[scheme] = handler
+	handlersMu.Unlock()
+}
+
+func getHandler(url string) Handler {
+	i := strings.IndexByte(url, ':')
+	if i <= 0 { // TODO: i < 4 ?
+		return nil
+	}
+	handlersMu.Lock()
+	defer handlersMu.Unlock()
+	return handlers[url[:i]]
+}
+
+func HasProducer(url string) bool {
+	return getHandler(url) != nil
+}
+
+func GetProducer(url string) (core.Producer, error) {
+	handler := getHandler(url)
+	if handler == nil {
+		return nil, fmt.Errorf("unsupported scheme: %s", url)
+	}
+	return handler(url)
+}