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qmp: add pull_event function

This function is unlike get_events in that it makes it easy to process
one event at a time.  This is useful in the mirroring test cases, where
we want to process just one event (BLOCK_JOB_ERROR) and leave the others
to a helper function.

Acked-by: Luiz Capitulino <>
Signed-off-by: Paolo Bonzini <>
Signed-off-by: Kevin Wolf <>
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commit 9eb80eadd498fae2ad9eecbb89646b0cc4929cac 1 parent b952b55
@bonzini bonzini authored Kevin Wolf committed
Showing with 20 additions and 0 deletions.
  1. +20 −0 QMP/
20 QMP/
@@ -136,6 +136,26 @@ def command(self, cmd, **kwds):
raise Exception(ret['error']['desc'])
return ret['return']
+ def pull_event(self, wait=False):
+ """
+ Get and delete the first available QMP event.
+ @param wait: block until an event is available (bool)
+ """
+ self.__sock.setblocking(0)
+ try:
+ self.__json_read()
+ except socket.error, err:
+ if err[0] == errno.EAGAIN:
+ # No data available
+ pass
+ self.__sock.setblocking(1)
+ if not self.__events and wait:
+ self.__json_read(only_event=True)
+ event = self.__events[0]
+ del self.__events[0]
+ return event
def get_events(self, wait=False):
Get a list of available QMP events.
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