Catch bad `name` and raise a `ValueError`

2 files changed, 26 insertions, 2 deletions

diff --git a/pyramid/tests/test_config/test_factories.py b/pyramid/tests/test_config/test_factories.py
index 6e679397f..5ae486c4b 100644
--- a/pyramid/tests/test_config/test_factories.py
+++ b/pyramid/tests/test_config/test_factories.py
@@ -111,6 +111,22 @@ class TestFactoriesMixin(unittest.TestCase):
         config = self._makeOne(autocommit=True)
         self.assertRaises(AttributeError, config.add_request_method)
 
+    def test_add_request_method_with_text_type_name(self):
+        from pyramid.interfaces import IRequestExtensions
+        from pyramid.compat import text_
+        from pyramid.util import InstancePropertyMixin
+
+        config = self._makeOne(autocommit=True)
+        def boomshaka(r): pass
+        name = text_(b'La Pe\xc3\xb1a', 'utf-8')
+        config.add_request_method(boomshaka, name=name)
+        exts = config.registry.getUtility(IRequestExtensions)
+        inst = InstancePropertyMixin()
+
+        def set_extensions():
+            inst._set_extensions(exts)
+        self.assertRaises(ValueError, set_extensions)
+        self.assertTrue(name in exts.methods)
 
 class TestDeprecatedFactoriesMixinMethods(unittest.TestCase):
     def setUp(self):
@@ -120,7 +136,7 @@ class TestDeprecatedFactoriesMixinMethods(unittest.TestCase):
     def tearDown(self):
         from zope.deprecation import __show__
         __show__.on()
-        
+
     def _makeOne(self, *arg, **kw):
         from pyramid.config import Configurator
         config = Configurator(*arg, **kw)
diff --git a/pyramid/util.py b/pyramid/util.py
index 6de53d559..e9f5760a6 100644
--- a/pyramid/util.py
+++ b/pyramid/util.py
@@ -111,7 +111,15 @@ class InstancePropertyMixin(object):
     def _set_extensions(self, extensions):
         for name, fn in iteritems_(extensions.methods):
             method = fn.__get__(self, self.__class__)
-            setattr(self, name, method)
+            try:
+                setattr(self, name, method)
+            except UnicodeEncodeError:
+                msg = (
+                    '`name="%s"` is invalid. `name` must be ascii because it is '
+                    'used on __name__ of the method'
+                )
+                raise ValueError(msg % name)
+
         self._set_properties(extensions.descriptors)
 
     def set_property(self, callable, name=None, reify=False):