proper error handling

cleanup files

pkg/doorbird/backchannel.go

@@ -5,9 +5,8 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/http"
 	"net/url"
-	"strconv"
-	"strings"
 	"time"
 
 	"github.com/AlexxIT/go2rtc/pkg/core"
@@ -57,22 +56,17 @@ func Dial(rawURL string) (*Client, error) {
 		return nil, err
 	}
 
-	reader := bufio.NewReader(conn)
+	resp, _ := http.ReadResponse(bufio.NewReader(conn), nil)
-	statusLine, _ := reader.ReadString('\n')
+	if resp != nil {
-	parts := strings.SplitN(statusLine, " ", 3)
+		switch resp.StatusCode {
-	if len(parts) >= 2 {
+		case 204:
-		statusCode, err := strconv.Atoi(parts[1])
-		if err == nil {
-			if statusCode == 204 {
 			conn.Close()
 			return nil, errors.New("DoorBird user has no api permission")
-			}
+		case 503:
-			if statusCode == 503 {
 			conn.Close()
 			return nil, errors.New("DoorBird device is busy")
 		}
 	}
-	}
 
 	medias := []*core.Media{
 		{

pkg/doorbird/backchannel_lock.go

@@ -1,5 +0,0 @@
-package doorbird
-
-import "sync"
-
-var backchannelMu sync.Mutex