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-rw-r--r--tests/qemu-iotests/iotests.py38
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 14028540b3..e93e62387b 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -78,6 +78,23 @@ def create_image(name, size):
         i = i + 512
     file.close()
 
+# Test if 'match' is a recursive subset of 'event'
+def event_match(event, match=None):
+    if match is None:
+        return True
+
+    for key in match:
+        if key in event:
+            if isinstance(event[key], dict):
+                if not event_match(event[key], match[key]):
+                    return False
+            elif event[key] != match[key]:
+                return False
+        else:
+            return False
+
+    return True
+
 class VM(object):
     '''A QEMU VM'''
 
@@ -92,6 +109,7 @@ class VM(object):
                      '-machine', 'accel=qtest',
                      '-display', 'none', '-vga', 'none']
         self._num_drives = 0
+        self._events = []
 
     # This can be used to add an unused monitor instance.
     def add_monitor_telnet(self, ip, port):
@@ -202,14 +220,34 @@ class VM(object):
 
     def get_qmp_event(self, wait=False):
         '''Poll for one queued QMP events and return it'''
+        if len(self._events) > 0:
+            return self._events.pop(0)
         return self._qmp.pull_event(wait=wait)
 
     def get_qmp_events(self, wait=False):
         '''Poll for queued QMP events and return a list of dicts'''
         events = self._qmp.get_events(wait=wait)
+        events.extend(self._events)
+        del self._events[:]
         self._qmp.clear_events()
         return events
 
+    def event_wait(self, name='BLOCK_JOB_COMPLETED', timeout=60.0, match=None):
+        # Search cached events
+        for event in self._events:
+            if (event['event'] == name) and event_match(event, match):
+                self._events.remove(event)
+                return event
+
+        # Poll for new events
+        while True:
+            event = self._qmp.pull_event(wait=timeout)
+            if (event['event'] == name) and event_match(event, match):
+                return event
+            self._events.append(event)
+
+        return None
+
 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 
 class QMPTestCase(unittest.TestCase):