caches: make sure __repr__ of invalidaiton context always return strings.

- this is a part of python specs, otherwise we potentially can cause
UnicodeDecodeErrors

rhodecode/lib/caches.py

@@ -167,7 +167,7 b' class FreshRegionCache(ActiveRegionCache'
 class InvalidationContext(object):
     def __repr__(self):
         return '<InvalidationContext:{}[{}]>'.format(
-            self.repo_name, self.cache_type)
+            safe_str(self.repo_name), safe_str(self.cache_type))
 
     def __init__(self, compute_func, repo_name, cache_type,
                  raise_exception=False):

rhodecode/tests/other/test_libs.py

@@ -432,7 +432,13 b' def test_get_repo_by_id(test, expected):'
     assert _test == expected
 
 
-def test_invalidation_context(pylonsapp):
[e-mail]("test_repo_name, repo_type", [
+  ("test_repo_1", None),
+  ("repo_group/foobar", None),
+  ("test_non_asci_ąćę", None),
+  (u"test_non_asci_unicode_ąćę", None),
+])
+def test_invalidation_context(pylonsapp, test_repo_name, repo_type):
     from beaker.cache import cache_region
     from rhodecode.lib import caches
     from rhodecode.model.db import CacheKey
@@ -442,7 +448,7 b' def test_invalidation_context(pylonsapp)'
         return 'result'
 
     invalidator_context = CacheKey.repo_context_cache(
-        _dummy_func, 'test_repo_1', 'repo')
+        _dummy_func, test_repo_name, 'repo')
 
     with invalidator_context as context:
         invalidated = context.invalidate()
@@ -452,6 +458,8 b' def test_invalidation_context(pylonsapp)'
     assert 'result' == result
     assert isinstance(context, caches.FreshRegionCache)
 
+    assert 'InvalidationContext' in repr(invalidator_context)
+
     with invalidator_context as context:
         context.invalidate()
         result = context.compute()