[FIX] Credentials: handling password credentials error

Orange/widgets/credentials.py

@@ -1,7 +1,11 @@
+import logging
+
 import keyring
 
 SERVICE_NAME = 'Orange3 - {}'
 
+log = logging.getLogger(__name__)
+
 
 class CredentialManager:
     """
@@ -13,13 +17,11 @@ class CredentialManager:
 
     Examples:
         >>> cm = CredentialManager('Widget Name')
-        >>> cm.username = 'Orange'      # store username
-        >>> cm.password = 'Secret'      # store password
-
-        >>> cm.username                 # get username
-        'Orange'
-        >>> cm.password                 # get password
-        'Secret'
+        >>> cm.some_secret = 'api-key-1234'
+        >>> cm.some_secret
+        'api-key-1234'
+        >>> del cm.some_secret
+        >>> cm.some_secret
     """
     def __init__(self, service_name):
         self.__dict__['__service_name'] = SERVICE_NAME.format(service_name)
@@ -29,10 +31,22 @@ def service_name(self):
         return self.__dict__['__service_name']
 
     def __setattr__(self, key, value):
-        keyring.set_password(self.service_name, key, value)
+        try:
+            keyring.set_password(self.service_name, key, value)
+        except Exception:
+            log.exception("Failed to set secret '%s' of '%r'.",
+                          key, self.service_name)
 
     def __getattr__(self, item):
-        return keyring.get_password(self.service_name, item)
+        try:
+            return keyring.get_password(self.service_name, item)
+        except Exception:
+            log.exception("Failed to get secret '%s' of '%r'.",
+                          item, self.service_name)
 
     def __delattr__(self, item):
-        keyring.delete_password(self.service_name, item)
+        try:
+            keyring.delete_password(self.service_name, item)
+        except Exception:
+            log.exception("Failed to delete secret '%s' of '%r'.",
+                          item, self.service_name)

Orange/widgets/tests/test_credentials.py

@@ -1,12 +1,41 @@
 import unittest
+from unittest.mock import patch
 
 from Orange.widgets.credentials import CredentialManager
 
 
-class CredentialManagerTests(unittest.TestCase):
+class TestCredentialManager(unittest.TestCase):
+    def setUp(self):
+        self.cm = CredentialManager('Orange')
+        self.cm.key = "Foo"
+
     def test_credential_manager(self):
         cm = CredentialManager('Orange')
         cm.key = 'Foo'
         self.assertEqual(cm.key, 'Foo')
         del cm.key
         self.assertEqual(cm.key, None)
+
+    def test_set_password(self):
+        """
+        Handle error when setting password fails.
+        GH-2354
+        """
+        with patch("keyring.set_password", side_effect=Exception):
+            self.cm.key = ""
+
+    def test_delete_password(self):
+        """
+        Handling error when deleting password fails
+        GH-2354
+        """
+        with patch("keyring.delete_password", side_effect=Exception):
+            del self.cm.key
+
+    def test_get_password(self):
+        """
+        Handling errors when getting password fails.
+        GH-2354
+        """
+        with patch("keyring.get_password", side_effect=Exception):
+            self.assertEqual(self.cm.key, None)