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qapi: Implement deprecated-output=hide for QMP events 

This policy suppresses deprecated bits in output, and thus permits
"testing the future".  Implement it for QMP events: suppress
deprecated ones.

No QMP event is deprecated right now.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210318155519.1224118-5-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2021-03-18 16:55:12 +01:00
parent 91fa93e516
commit 278fc2f7d3
2 changed files with 31 additions and 1 deletions
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12
scripts/qapi/events.py
View File

@ -79,6 +79,7 @@ def gen_param_var(typ: QAPISchemaObjectType) -> str:
def gen_event_send(name: str,
arg_type: Optional[QAPISchemaObjectType],
features: List[QAPISchemaFeature],
boxed: bool,
event_enum_name: str,
event_emit: str) -> str:
@ -107,6 +108,14 @@ def gen_event_send(name: str,
if not boxed:
ret += gen_param_var(arg_type)
if 'deprecated' in [f.name for f in features]:
ret += mcgen('''
if (compat_policy.deprecated_output == COMPAT_POLICY_OUTPUT_HIDE) {
return;
}
''')
ret += mcgen('''
qmp = qmp_event_build_dict("%(name)s");
@ -176,6 +185,7 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
#include "%(prefix)sqapi-emit-events.h"
#include "%(events)s.h"
#include "%(visit)s.h"
#include "qapi/compat-policy.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qobject-output-visitor.h"
@ -220,7 +230,7 @@ void %(event_emit)s(%(event_enum)s event, QDict *qdict);
boxed: bool) -> None:
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_event_send_decl(name, arg_type, boxed))
self._genc.add(gen_event_send(name, arg_type, boxed,
self._genc.add(gen_event_send(name, arg_type, features, boxed,
self._event_enum_name,
self._event_emit_name))
# Note: we generate the enum member regardless of @ifcond, to

20
tests/unit/test-qmp-event.c
View File

@ -14,6 +14,7 @@
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/compat-policy.h"
#include "qapi/error.h"
#include "qapi/qmp/qbool.h"
#include "qapi/qmp/qdict.h"
@ -140,6 +141,24 @@ static void test_event_d(TestEventData *data,
qobject_unref(data->expect);
}
static void test_event_deprecated(TestEventData *data, const void *unused)
{
data->expect = qdict_from_jsonf_nofail("{ 'event': 'TEST-EVENT-FEATURES1' }");
memset(&compat_policy, 0, sizeof(compat_policy));
qapi_event_send_test_event_features1();
g_assert(data->emitted);
compat_policy.has_deprecated_output = true;
compat_policy.deprecated_output = COMPAT_POLICY_OUTPUT_HIDE;
data->emitted = false;
qapi_event_send_test_event_features1();
g_assert(!data->emitted);
qobject_unref(data->expect);
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
@ -148,6 +167,7 @@ int main(int argc, char **argv)
event_test_add("/event/event_b", test_event_b);
event_test_add("/event/event_c", test_event_c);
event_test_add("/event/event_d", test_event_d);
event_test_add("/event/deprecated", test_event_deprecated);
g_test_run();
return 0;