fix: P0 — add User-Agent + retry to bash urllib, retry to service_spec_gen, empty-list guard

universal_rebuild/tools/service_spec_gen/generate_service_spec.go

@@ -388,30 +388,59 @@ func (c *apiClient) getServiceOperation(svcOperationId int) (serviceOperationInf
 }
 
 func (c *apiClient) getViaProxy(endpoint string, out interface{}) error {
-	// The API uses a proxy query parameter called "endpoint".
-	req, err := http.NewRequest("GET", c.endpoint, nil)
-	if err != nil {
-		return err
+	const maxRetries = 3
+	baseDelay := 2 * time.Second
+
+	var lastErr error
+	for attempt := 0; attempt <= maxRetries; attempt++ {
+		if attempt > 0 {
+			time.Sleep(baseDelay * time.Duration(1<<(attempt-1)))
+		}
+
+		req, err := http.NewRequest("GET", c.endpoint, nil)
+		if err != nil {
+			return err
+		}
+		q := req.URL.Query()
+		q.Set("endpoint", endpoint)
+		req.URL.RawQuery = q.Encode()
+		if c.token != "" {
+			req.Header.Set("Authorization", "Bearer "+c.token)
+		}
+		req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; Terraform-Provider-Nubes/Generator)")
+		resp, err := c.httpClient.Do(req)
+		if err != nil {
+			lastErr = err
+			if attempt < maxRetries {
+				continue
+			}
+			return err
+		}
+
+		body, readErr := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if readErr != nil {
+			lastErr = readErr
+			if attempt < maxRetries {
+				continue
+			}
+			return readErr
+		}
+
+		if resp.StatusCode != 200 {
+			err := fmt.Errorf("status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+			// Retry on transient errors
+			if attempt < maxRetries && (resp.StatusCode == 429 || resp.StatusCode >= 500) {
+				lastErr = err
+				continue
+			}
+			return err
+		}
+
+		return json.Unmarshal(body, out)
 	}
-	q := req.URL.Query()
-	q.Set("endpoint", endpoint)
-	req.URL.RawQuery = q.Encode()
-	if c.token != "" {
-		req.Header.Set("Authorization", "Bearer "+c.token)
-	}
-	// User-Agent: браузерный, чтобы пройти DDoS-Guard (см. docs/ops/API_TOKENS.md).
-	req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; Terraform-Provider-Nubes/Generator)")
-	resp, err := c.httpClient.Do(req)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode != 200 {
-		body, _ := io.ReadAll(resp.Body)
-		return fmt.Errorf("status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
-	}
-	dec := json.NewDecoder(resp.Body)
-	return dec.Decode(out)
+
+	return fmt.Errorf("getViaProxy failed after %d retries: %w", maxRetries, lastErr)
 }
 
 func (c *apiClient) collectOperations(ops []operationInfo) ([]OperationSpec, bool, bool, bool, error) {