1 files changed, 61 insertions, 0 deletions
diff --git a/src/leap/util/check.py b/src/leap/util/check.py
new file mode 100644
index 00000000..9787341a
--- /dev/null
+++ b/src/leap/util/check.py
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+# check.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Set of functions to help checking situations
+"""
+import logging
+import inspect
+import traceback
+
+
+logger = logging.getLogger(__name__)
+
+
+def leap_assert(condition, message=""):
+    """
+    Asserts the condition and displays the message if that's not
+    met. It also logs the error and its backtrace.
+
+    @param condition: condition to check
+    @type condition: bool
+    @param message: message to display if the condition isn't met
+    @type message: str
+    """
+    if not condition:
+        logger.error("Bug: %s" % (message,))
+        try:
+            frame = inspect.currentframe()
+            stack_trace = traceback.format_stack(frame)
+            logger.error(''.join(stack_trace))
+        except Exception as e:
+            logger.error("Bug in leap_assert: %r" % (e,))
+    assert condition, message
+
+
+def leap_assert_type(var, expectedType):
+    """
+    Helper assert check for a variable's expected type
+
+    @param var: variable to check
+    @type var: any
+    @param expectedType: type to check agains
+    @type expectedType: type
+    """
+    leap_assert(isinstance(var, expectedType),
+                "Expected type %r instead of %r" %
+                (expectedType, type(var)))