feat: restore pyo3 request logging path

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

tests/unit/mcpgateway/middleware/test_request_logging_middleware.py

@@ -125,7 +125,7 @@ def test_mask_sensitive_data_ignores_empty_normalized_keys():
     assert masked["password"] == "******"
 
 
-def test_mask_sensitive_data_uses_rust_sidecar_when_enabled(monkeypatch):
+def test_mask_sensitive_data_uses_pyo3_module_when_enabled(monkeypatch):
     rust_module = MagicMock()
     rust_module.mask_sensitive_data.return_value = {"password": "******", "username": "user"}  # pragma: allowlist secret
     monkeypatch.setattr("mcpgateway.middleware.request_logging_middleware.settings.experimental_rust_request_logging_masking_enabled", True, raising=False)
@@ -137,14 +137,6 @@ def test_mask_sensitive_data_uses_rust_sidecar_when_enabled(monkeypatch):
     rust_module.mask_sensitive_data.assert_called_once_with({"password": "secret", "username": "user"}, 10)  # pragma: allowlist secret
 
 
-def test_mask_sensitive_headers_missing_sidecar_is_hard_failure_when_enabled(monkeypatch):
-    monkeypatch.setattr("mcpgateway.middleware.request_logging_middleware.settings.experimental_rust_request_logging_masking_enabled", True, raising=False)
-
-    with patch("mcpgateway.middleware.request_logging_middleware._load_rust_request_logging_module", side_effect=ModuleNotFoundError("missing sidecar")):
-        with pytest.raises(ModuleNotFoundError, match="missing sidecar"):
-            mask_sensitive_headers({"Authorization": "Bearer abc"})
-
-
 # --- mask_jwt_in_cookies tests ---
 
 
@@ -204,6 +196,18 @@ def test_mask_sensitive_headers_respects_non_sensitive_suffixes():
     assert masked["X-JWT_Status_Count"] == "7"
 
 
+def test_mask_sensitive_headers_uses_pyo3_module_when_enabled(monkeypatch):
+    rust_module = MagicMock()
+    rust_module.mask_sensitive_headers.return_value = {"Authorization": "******"}
+    monkeypatch.setattr("mcpgateway.middleware.request_logging_middleware.settings.experimental_rust_request_logging_masking_enabled", True, raising=False)
+
+    with patch("mcpgateway.middleware.request_logging_middleware._load_rust_request_logging_module", return_value=rust_module):
+        masked = mask_sensitive_headers({"Authorization": "Bearer abc"})
+
+    assert masked == {"Authorization": "******"}
+    rust_module.mask_sensitive_headers.assert_called_once_with({"Authorization": "Bearer abc"})
+
+
 # --- RequestLoggingMiddleware tests ---
 
 

tests/unit/mcpgateway/test_request_logging_config.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+"""Configuration tests for request-logging Rust integration."""
+
+from mcpgateway.config import Settings
+
+
+def test_request_logging_uses_single_pyo3_flag(monkeypatch):
+    """The request-logging Rust integration should be controlled by one PyO3 flag."""
+    monkeypatch.setenv("EXPERIMENTAL_RUST_REQUEST_LOGGING_MASKING_ENABLED", "true")
+
+    settings = Settings(_env_file=None)
+
+    assert settings.experimental_rust_request_logging_masking_enabled is True