Add leap_check helper method, #3007 related issue.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/leap/common/check.py b/src/leap/common/check.py
index e6b0b52..82da5ff 100644
--- a/src/leap/common/check.py
+++ b/src/leap/common/check.py
@@ -60,3 +60,20 @@ def leap_assert_type(var, expectedType):
     leap_assert(isinstance(var, expectedType),
                 "Expected type %r instead of %r" %
                 (expectedType, type(var)))
+
+
+def leap_check(condition, message="", exception=Exception):
+    """
+    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
+    :param exception: the exception to raise in case of condition being false.
+    :type exception: Exception
+    """
+    if not condition:
+        logger.error(message)
+        raise exception(message)