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Add 'query-events' command to QMP to query async events

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Sometimes it is neccessary for an application to determine
whether a particular QMP event is available, so they can
decide whether to use compatibility code instead. This
introduces a new 'query-events' command to QMP to do just
that

 { "execute": "query-events" }
 {"return": [{"name": "WAKEUP"},
             {"name": "SUSPEND"},
             {"name": "DEVICE_TRAY_MOVED"},
             {"name": "BLOCK_JOB_CANCELLED"},
             {"name": "BLOCK_JOB_COMPLETED"},
             ...snip...
             {"name": "SHUTDOWN"}]}

* monitor.c: Turn MonitorEvent -> string conversion
  into a lookup from a static table of constant strings.
  Add impl of qmp_query_events monitor command handler
* qapi-schema.json, qmp-commands.hx: Define contract of
  query-events command

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-05-21 17:59:51 +01:00 • committed by Luiz Capitulino
parent 5f96415527
commit 4860853d60
4 changed files with 108 additions and 62 deletions
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22
qapi-schema.json
View file

@ -227,6 +227,28 @@
##
{ 'command': 'query-commands', 'returns': ['CommandInfo'] }
##
# @EventInfo:
#
# Information about a QMP event
#
# @name: The event name
#
# Since: 1.2.0
##
{ 'type': 'EventInfo', 'data': {'name': 'str'} }
##
# @query-events:
#
# Return a list of supported QMP events by this server
#
# Returns: A list of @EventInfo for all supported events
#
# Since: 1.2.0
##
{ 'command': 'query-events', 'returns': ['EventInfo'] }
##
# @MigrationStats
#