feat: optimize VK TURN credential retrieval and reuse session identity

Добавлено кэширование success_token для капчи.
Установлен размер пула 1 для использования одной учетной записи во всех потоках.

Дополнительно устранил warnings от golangcli-lint:
Удален rand.Seed
Реализована проверка ошибки в endSession
Реализована обработка Body.Close()

client/main.go

@@ -238,7 +238,11 @@ func fetchPowInput(ctx context.Context, redirectUri string, dialer *dnsdialer.Di
 	if err != nil {
 		return "", 0, err
 	}
-	defer resp.Body.Close()
+	defer func() {
+		if closeErr := resp.Body.Close(); closeErr != nil {
+			log.Printf("Failed to close response body: %v", closeErr)
+		}
+	}()
 
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
@@ -300,7 +304,11 @@ func callCaptchaNotRobot(ctx context.Context, sessionToken, hash string, dialer
 		if err != nil {
 			return nil, err
 		}
-		defer httpResp.Body.Close()
+		defer func() {
+			if closeErr := httpResp.Body.Close(); closeErr != nil {
+				log.Printf("Failed to close response body: %v", closeErr)
+			}
+		}()
 
 		body, err := io.ReadAll(httpResp.Body)
 		if err != nil {
@@ -365,13 +373,20 @@ func callCaptchaNotRobot(ctx context.Context, sessionToken, hash string, dialer
 	time.Sleep(200 * time.Millisecond)
 
 	// Step 4: endSession
-	vkReq("captchaNotRobot.endSession", baseParams)
+	if _, err := vkReq("captchaNotRobot.endSession", baseParams); err != nil {
+		log.Printf("endSession failed: %v", err)
+	}
 
 	return successToken, nil
 }
 
 // endregion automatic captcha solver
 
+var (
+	cachedCaptchaTokenMu sync.Mutex
+	cachedCaptchaToken   string
+)
+
 func getVkCreds(link string, dialer *dnsdialer.Dialer) (string, string, string, error) {
 	profile := getRandomProfile()
 	name := generateName()
@@ -446,7 +461,14 @@ func getVkCreds(link string, dialer *dnsdialer.Dialer) (string, string, string,
 		return "", "", "", fmt.Errorf("missing access_token in response: %v", resp)
 	}
 
+	cachedCaptchaTokenMu.Lock()
+	curSuccessToken := cachedCaptchaToken
+	cachedCaptchaTokenMu.Unlock()
+
 	data = fmt.Sprintf("vk_join_link=https://vk.com/call/join/%s&name=%s&access_token=%s", link, escapedName, token1)
+	if curSuccessToken != "" {
+		data += fmt.Sprintf("&success_token=%s", neturl.QueryEscape(curSuccessToken))
+	}
 	url = "https://api.vk.ru/method/calls.getAnonymousToken?v=5.274&client_id=6287487"
 
 	var token2 string
@@ -472,6 +494,10 @@ func getVkCreds(link string, dialer *dnsdialer.Dialer) (string, string, string,
 						return "", "", "", fmt.Errorf("auto captcha solve error: %w", solveErr)
 					}
 
+					cachedCaptchaTokenMu.Lock()
+					cachedCaptchaToken = successToken
+					cachedCaptchaTokenMu.Unlock()
+
 					if captchaErr.CaptchaAttempt == "0" || captchaErr.CaptchaAttempt == "" {
 						captchaErr.CaptchaAttempt = "1"
 					}
@@ -1263,7 +1289,6 @@ func poolCreds(f getCredsFunc, poolSize int) getCredsFunc {
 }
 
 func main() { //nolint:cyclop
-	rand.Seed(time.Now().UnixNano())
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	signalChan := make(chan os.Signal, 1)
@@ -1335,7 +1360,7 @@ func main() { //nolint:cyclop
 		port:     *port,
 		link:     link,
 		udp:      *udp,
-		getCreds: poolCreds(getCreds, *n),
+		getCreds: poolCreds(getCreds, 1),
 	}
 
 	if *tcpMode {

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/gorilla/websocket v1.5.3
 	github.com/pion/dtls/v3 v3.0.11
 	github.com/pion/logging v0.2.4
+	github.com/pion/transport/v4 v4.0.1
 	github.com/pion/turn/v5 v5.0.2
 	github.com/xtaci/kcp-go/v5 v5.6.18
 	github.com/xtaci/smux v1.5.34
@@ -22,7 +23,6 @@ require (
 	github.com/miekg/dns v1.1.69 // indirect
 	github.com/pion/randutil v0.1.0 // indirect
 	github.com/pion/stun/v3 v3.1.1 // indirect
-	github.com/pion/transport/v4 v4.0.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/templexxx/cpu v0.1.1 // indirect
 	github.com/templexxx/xorsimd v0.4.3 // indirect

routes.ps1

@@ -1,4 +1,4 @@
-# Получаем default gateway (IPv4)
+# Получаем default gateway (IPv4)
 $gateway = Get-NetRoute `
     -DestinationPrefix "0.0.0.0/0" `
     | Sort-Object RouteMetric `