QA: Release instances through method

Instead of having a module-level function in “qa_config” to release an
instance, a new method on instance objects is used.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Bernardo Dal Seno <bdalseno@google.com>

qa/ganeti-qa.py

@@ -290,7 +290,7 @@ def RunCommonInstanceTests(instance):
         RunTestIf("rapi", qa_rapi.TestRapiInstanceRenameAndBack,
                   rename_source, rename_target)
     finally:
-      qa_config.ReleaseInstance(tgt_instance)
+      tgt_instance.Release()
 
   RunTestIf(["instance-grow-disk"], qa_instance.TestInstanceGrowDisk, instance)
 
@@ -375,7 +375,7 @@ def RunExportImportTests(instance, inodes):
           RunTest(qa_instance.TestInstanceStartup, newinst)
           RunTest(qa_instance.TestInstanceRemove, newinst)
         finally:
-          qa_config.ReleaseInstance(newinst)
+          newinst.Release()
     finally:
       qa_config.ReleaseNode(expnode)
 
@@ -389,7 +389,7 @@ def RunExportImportTests(instance, inodes):
       finally:
         qa_config.ReleaseNode(tnode)
     finally:
-      qa_config.ReleaseInstance(newinst)
+      newinst.Release()
 
 
 def RunDaemonTests(instance):
@@ -482,9 +482,9 @@ def RunExclusiveStorageTests():
           qa_instance.TestInstanceRemove(instance2)
           qa_instance.TestInstanceRemove(instance1)
         finally:
-          qa_config.ReleaseInstance(instance2)
+          instance2.Release()
       finally:
-        qa_config.ReleaseInstance(instance1)
+        instance1.Release()
 
     if qa_config.TestEnabled("instance-add-drbd-disk"):
       snode = qa_config.AcquireNode()
@@ -497,7 +497,7 @@ def RunExclusiveStorageTests():
           qa_cluster.AssertClusterVerify(fail=True, errors=exp_err)
           qa_instance.TestInstanceRemove(instance)
         finally:
-          qa_config.ReleaseInstance(instance)
+          instance.Release()
       finally:
         qa_config.ReleaseNode(snode)
     qa_cluster.TestSetExclStorCluster(old_es)
@@ -541,7 +541,7 @@ def RunInstanceTests():
           RunRepairDiskSizes()
           RunTest(qa_instance.TestInstanceRemove, instance)
         finally:
-          qa_config.ReleaseInstance(instance)
+          instance.Release()
 
         del instance
       finally:
@@ -601,7 +601,7 @@ def RunQa():
               RunCommonInstanceTests(rapi_instance)
             RunTest(qa_rapi.TestRapiInstanceRemove, rapi_instance, use_client)
           finally:
-            qa_config.ReleaseInstance(rapi_instance)
+            rapi_instance.Release()
           del rapi_instance
 
   finally:
@@ -635,7 +635,7 @@ def RunQa():
           finally:
             qa_config.ReleaseNode(expnode)
         finally:
-          qa_config.ReleaseInstance(instance)
+          instance.Release()
         del expnode
         del instance
       qa_cluster.AssertClusterVerify()

qa/qa_cluster.py

@@ -553,7 +553,7 @@ def TestClusterBurnin():
 
   finally:
     for inst in instances:
-      qa_config.ReleaseInstance(inst)
+      inst.Release()
 
 
 def TestClusterMasterFailover():

qa/qa_config.py

@@ -88,6 +88,17 @@ class _QaInstance(object):
     except KeyError:
       return default
 
+  def Release(self):
+    """Releases instance and makes it available again.
+
+    """
+    assert self.used, \
+      ("Instance '%s' was never acquired or released more than once" %
+       self.name)
+
+    self.used = False
+    self.disk_template = None
+
   def GetNicMacAddr(self, idx, default):
     """Returns MAC address for NIC.
 
@@ -422,11 +433,6 @@ def AcquireInstance(_cfg=None):
   return inst
 
 
-def ReleaseInstance(inst):
-  inst.used = False
-  inst.disk_template = None
-
-
 def GetInstanceTemplate(inst):
   """Return the disk template of an instance.
 

qa/qa_instance.py

@@ -80,7 +80,7 @@ def _DiskTest(node, disk_template):
 
     return instance
   except:
-    qa_config.ReleaseInstance(instance)
+    instance.Release()
     raise
 
 

qa/qa_rapi.py

@@ -598,7 +598,7 @@ def TestRapiInstanceAdd(node, use_client):
 
     return instance
   except:
-    qa_config.ReleaseInstance(instance)
+    instance.Release()
     raise
 
 

test/py/qa.qa_config_unittest.py

@@ -285,7 +285,7 @@ class TestQaConfig(unittest.TestCase):
     self.assertTrue(inst.used)
     self.assertTrue(inst.disk_template is None)
 
-    qa_config.ReleaseInstance(inst)
+    inst.Release()
 
     self.assertFalse(inst.used)
     self.assertTrue(inst.disk_template is None)