Change in vdsm[master]: libvirtconnection: Replace assert with AssertionError

[Nir Soffer]

Nir Soffer has uploaded a new change for review.

Change subject: libvirtconnection: Replace assert with AssertionError
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libvirtconnection: Replace assert with AssertionError

The code wrongly assumed that assert always exists. When running in
optimized mode, the check would be skipped, and instead of getting an
AssertionError, which is the expected error for programmer error
(starting the eventloop twice), we could get a confusing
RuntimeException or RuntimeError from Thread.start (depending on Python
version).

RuntimeError misused in the standard library for all kinds of errors
that do not have builtin errors. It is particularry bad option when used
for usage error.

Change-Id: Icf1564f81f4c1fbf77ccaff6d93c047a02d946da
Signed-off-by: Nir Soffer 
---
M lib/vdsm/libvirtconnection.py
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/64/34364/1

diff --git a/lib/vdsm/libvirtconnection.py b/lib/vdsm/libvirtconnection.py
index 5430c82..009f8b7 100644
--- a/lib/vdsm/libvirtconnection.py
+++ b/lib/vdsm/libvirtconnection.py
@@ -37,7 +37,8 @@
         self.__thread = None

def start(self):
-        assert not self.run
+        if self.run:
+            raise AssertionError("EventLoop is running")
         self.__thread = threading.Thread(target=self.__run,
                                          name="libvirtEventLoop")
         self.__thread.setDaemon(True)