Handle RequestException as Service Unavailable errors.

syncto/tests/test_functional.py

@@ -4,7 +4,7 @@
 
 from cliquet.errors import ERRORS
 from cliquet.tests.support import FormattedErrorMixin
-from requests.exceptions import HTTPError
+from requests.exceptions import HTTPError, ConnectionError
 from syncto import AUTHORIZATION_HEADER, CLIENT_STATE_HEADER
 from syncto import main as testapp
 
@@ -114,6 +114,20 @@ def test_error_with_syncclient_server_raise_a_503(self):
         self.assertFormattedError(
             resp, 503, ERRORS.BACKEND, "Service Unavailable", "retry later")
 
+    def test_error_with_syncclient_server_request(self):
+        headers = self.headers.copy()
+        headers['Authorization'] = "BrowserID valid-browser-id-assertion"
+        headers['X-Client-State'] = "ValidClientState"
+        with mock.patch("syncto.authentication.TokenserverClient",
+                        side_effect=ConnectionError):
+            resp = self.app.get(COLLECTION_URL, headers=headers, status=503)
+
+            error_msg = ("Unable to reach the service. Check your "
+                         "internet connection or firewall configuration.")
+
+        self.assertFormattedError(
+            resp, 503, ERRORS.BACKEND, "Service Unavailable", error_msg)
+
 
 class BaseViewTest(BaseWebTest, unittest.TestCase):
     patch_authent_for = 'record'

syncto/views/errors.py

@@ -1,7 +1,7 @@
 from pyramid import httpexceptions
 from pyramid.security import NO_PERMISSION_REQUIRED, forget
 from pyramid.view import view_config
-from requests.exceptions import HTTPError
+from requests.exceptions import HTTPError, RequestException
 
 from cliquet import logger
 from cliquet.errors import http_error, ERRORS
@@ -12,7 +12,7 @@
 
 
 @view_config(context=HTTPError, permission=NO_PERMISSION_REQUIRED)
-def error(context, request):
+def response_error(context, request):
     """Catch server errors and trace them."""
     message = '%s %s: %s' % (context.response.status_code,
                              context.response.reason,
@@ -42,9 +42,25 @@ def error(context, request):
                                   errno=ERRORS.INVALID_RESOURCE_ID,
                                   message=message)
         else:
-            response = service_unavailable(context, request)
+            response = service_unavailable(
+                httpexceptions.HTTPServiceUnavailable(),
+                request)
 
     request.response = response
     export_headers(context.response, request)
 
     return reapply_cors(request, response)
+
+
+@view_config(context=RequestException, permission=NO_PERMISSION_REQUIRED)
+def request_error(context, request):
+    """Catch requests errors when issuing a request."""
+    logger.error(context, exc_info=True)
+
+    error_msg = ("Unable to reach the service. "
+                 "Check your internet connection or firewall configuration.")
+    response = http_error(httpexceptions.HTTPServiceUnavailable(),
+                          errno=ERRORS.BACKEND,
+                          message=error_msg)
+
+    return service_unavailable(response, request)