avocado.core.runner: Get proper status

Currently the test status was only updated on `TestStatus.check` method,
which was also used in `TestStatus.abort`. But the meaning of `check`
return is whether the job was interrupted. It does not mean the status
is valid, which in some cases might have reported the test status `None`.

This patch reworks the way we interact with `TestStatus`. It contains
`interrupt` variable, which means the test was interrupted and we should
leave the execution. It still have the `status` variable, which contains
the status, but now those two variables are automatically updated on
query (using __getattribute__).
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

avocado/core/runner.py

@@ -51,6 +51,7 @@ class TestStatus(object):
         self.queue = queue
         self._early_status = None
         self.status = {}
+        self.interrupt = None
 
     @property
     def early_status(self):
@@ -76,6 +77,12 @@ class TestStatus(object):
                 else:   # Not an early_status message
                     queue.append(msg)
 
+    def __getattribute__(self, name):
+        # Update state before returning the value
+        if name in ("status", "interrupt"):
+            self._tick()
+        return super(TestStatus, self).__getattribute__(name)
+
     def wait_for_early_status(self, proc, timeout):
         """
         Wait until early_status is obtained
@@ -97,12 +104,10 @@ class TestStatus(object):
                 raise exceptions.TestError(msg)
             time.sleep(0)
 
-    def check(self):
+    def _tick(self):
         """
-        Check if there are messages queued and handle them
-        :return: True if everything is ok, False on interruption (break)
+        Process the queue and update current status
         """
-        res = True
         while not self.queue.empty():
             msg = self.queue.get()
             if "func_at_exit" in msg:
@@ -112,8 +117,7 @@ class TestStatus(object):
                                              msg.get("once", False))
             elif not msg.get("running", True):
                 self.status = msg
-                res = False
-                continue
+                self.interrupt = True
             elif "paused" in msg:
                 self.status = msg
                 self.job.result_proxy.notify_progress(False)
@@ -123,7 +127,6 @@ class TestStatus(object):
                         self.job.view.notify(event='partial', msg=reason)
             else:       # test_status
                 self.status = msg
-        return res
 
     def abort(self, test_alive, started, timeout, first, step):
         """
@@ -134,7 +137,7 @@ class TestStatus(object):
         :param first: Delay before first check
         :param step: Step between checks for the status
         """
-        if test_alive and wait.wait_for(lambda: not self.check(), timeout,
+        if test_alive and wait.wait_for(lambda: self.status, timeout,
                                         first, step):
             return self.status
         else:
@@ -270,7 +273,7 @@ class TestRunner(object):
                     break
                 wait.wait_for(lambda: not queue.empty() or not proc.is_alive(),
                               cycle_timeout, first, step)
-                if not test_status.check():
+                if test_status.interrupt:
                     break
                 if proc.is_alive():
                     if ctrl_c_count == 0:
@@ -300,7 +303,6 @@ class TestRunner(object):
                     os.kill(proc.pid, signal.SIGKILL)
 
         # Get/update the test status
-        test_status.check()
         if test_status.status:
             test_state = test_status.status
         else: