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[PATCH v4 02/10] tests/qtest: add support for callback to receive QMP ev
From: |
Daniel P . Berrangé |
Subject: |
[PATCH v4 02/10] tests/qtest: add support for callback to receive QMP events |
Date: |
Thu, 1 Jun 2023 17:13:39 +0100 |
Currently code must call one of the qtest_qmp_event* functions to
fetch events. These are only usable if the immediate caller knows
the particular event they want to capture, and are only interested
in one specific event type. Adding ability to register an event
callback lets the caller capture a range of events over any period
of time.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
tests/qtest/libqtest.c | 18 ++++++++++++++++--
tests/qtest/libqtest.h | 43 ++++++++++++++++++++++++++++++++++++++++--
2 files changed, 57 insertions(+), 4 deletions(-)
diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 7ae28fb6ac..77de16227f 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -82,6 +82,8 @@ struct QTestState
GString *rx;
QTestTransportOps ops;
GList *pending_events;
+ QTestQMPEventCallback eventCB;
+ void *eventData;
};
static GHookList abrt_hooks;
@@ -703,8 +705,13 @@ QDict *qtest_qmp_receive(QTestState *s)
if (!qdict_get_try_str(response, "event")) {
return response;
}
- /* Stash the event for a later consumption */
- s->pending_events = g_list_append(s->pending_events, response);
+
+ if (!s->eventCB ||
+ !s->eventCB(s, qdict_get_str(response, "event"),
+ response, s->eventData)) {
+ /* Stash the event for a later consumption */
+ s->pending_events = g_list_append(s->pending_events, response);
+ }
}
}
@@ -808,6 +815,13 @@ void qtest_qmp_send_raw(QTestState *s, const char *fmt,
...)
va_end(ap);
}
+void qtest_qmp_set_event_callback(QTestState *s,
+ QTestQMPEventCallback cb, void *opaque)
+{
+ s->eventCB = cb;
+ s->eventData = opaque;
+}
+
QDict *qtest_qmp_event_ref(QTestState *s, const char *event)
{
while (s->pending_events) {
diff --git a/tests/qtest/libqtest.h b/tests/qtest/libqtest.h
index d310eba7fb..a12acf7fa9 100644
--- a/tests/qtest/libqtest.h
+++ b/tests/qtest/libqtest.h
@@ -238,17 +238,52 @@ QDict *qtest_qmp_receive_dict(QTestState *s);
* @s: #QTestState instance to operate on.
*
* Reads a QMP message from QEMU and returns the response.
- * Buffers all the events received meanwhile, until a
- * call to qtest_qmp_eventwait
+ *
+ * If a callback is registered with qtest_qmp_set_event_callback,
+ * it will be invoked for every event seen, otherwise events
+ * will be buffered until a call to one of the qtest_qmp_eventwait
+ * family of functions.
*/
QDict *qtest_qmp_receive(QTestState *s);
+/*
+ * QTestQMPEventCallback:
+ * @s: #QTestState instance event was received on
+ * @name: name of the event type
+ * @event: #QDict for the event details
+ * @opaque: opaque data from time of callback registration
+ *
+ * This callback will be invoked whenever an event is received.
+ * If the callback returns true the event will be consumed,
+ * otherwise it will be put on the list of pending events.
+ * Pending events can be later handled by calling either
+ * qtest_qmp_eventwait or qtest_qmp_eventwait_ref.
+ *
+ * Return: true to consume the event, false to let it be queued
+ */
+typedef bool (*QTestQMPEventCallback)(QTestState *s, const char *name,
+ QDict *event, void *opaque);
+
+/**
+ * qtest_qmp_set_event_callback:
+ * @s: #QTestSTate instance to operate on
+ * @cb: callback to invoke for events
+ * @opaque: data to pass to @cb
+ *
+ * Register a callback to be invoked whenever an event arrives
+ */
+void qtest_qmp_set_event_callback(QTestState *s,
+ QTestQMPEventCallback cb, void *opaque);
+
/**
* qtest_qmp_eventwait:
* @s: #QTestState instance to operate on.
* @event: event to wait for.
*
* Continuously polls for QMP responses until it receives the desired event.
+ *
+ * Any callback registered with qtest_qmp_set_event_callback will
+ * be invoked for every event seen.
*/
void qtest_qmp_eventwait(QTestState *s, const char *event);
@@ -258,6 +293,10 @@ void qtest_qmp_eventwait(QTestState *s, const char *event);
* @event: event to wait for.
*
* Continuously polls for QMP responses until it receives the desired event.
+ *
+ * Any callback registered with qtest_qmp_set_event_callback will
+ * be invoked for every event seen.
+ *
* Returns a copy of the event for further investigation.
*/
QDict *qtest_qmp_eventwait_ref(QTestState *s, const char *event);
--
2.40.1
- [PATCH v4 00/10] tests/qtest: make migration-test massively faster, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 03/10] tests/qtest: get rid of 'qmp_command' helper in migration test, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 04/10] tests/qtest: get rid of some 'qtest_qmp' usage in migration test, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 02/10] tests/qtest: add support for callback to receive QMP events,
Daniel P . Berrangé <=
- [PATCH v4 05/10] tests/qtest: switch to using event callbacks for STOP event, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 06/10] tests/qtest: replace wait_command() with qtest_qmp_assert_success, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 07/10] tests/qtest: capture RESUME events during migration, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 08/10] tests/qtest: distinguish src/dst migration VM stop/resume events, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 10/10] tests/qtest: massively speed up migration-test, Daniel P . Berrangé, 2023/06/01
- [PATCH v4 09/10] tests/qtest: make more migration pre-copy scenarios run non-live, Daniel P . Berrangé, 2023/06/01