[Qemu-devel] [RFC PATCH V3 5/5] qapi event: convert RTC_CHANGE

[Wenchao Xia]

This is just an example of how to use qapi event API, and it
bypassed the event throttle queue. A complete convert should
be first define all events in qapi-schema.json, use qapi
event types in monitor functions, then change caller one
by one.

Signed-off-by: Wenchao Xia <wenchaoq...@gmail.com>
---
 monitor.c        |   15 +++++++++++++++
 qapi-schema.json |   13 +++++++++++++
 vl.c             |    7 ++-----
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/monitor.c b/monitor.c
index 342e83b..163f654 100644
--- a/monitor.c
+++ b/monitor.c
@@ -57,6 +57,7 @@
 #include "qapi/qmp/qjson.h"
 #include "qapi/qmp/json-streamer.h"
 #include "qapi/qmp/json-parser.h"
+#include "qapi/qmp-event.h"
 #include <qom/object_interfaces.h>
 #include "qemu/osdep.h"
 #include "cpu.h"
@@ -76,6 +77,8 @@
 #endif
 #include "hw/lm32/lm32_pic.h"
 
+#include "qapi-event.h"
+
 //#define DEBUG
 //#define DEBUG_COMPLETION
 
@@ -632,6 +635,16 @@ monitor_protocol_event_throttle(MonitorEvent event,
     evstate->data = NULL;
 }
 
+static void monitor_event_emit(int event_kind, QDict *d, Error **errp)
+{
+    Monitor *mon;
+
+    QLIST_FOREACH(mon, &mon_list, entry) {
+        if (monitor_ctrl_mode(mon) && qmp_cmd_mode(mon)) {
+            monitor_json_emitter(mon, QOBJECT(d));
+        }
+    }
+}
 
 /* Global, one-time initializer to configure the rate limiting
  * and initialize state */
@@ -644,6 +657,8 @@ static void monitor_protocol_event_init(void)
     /* limit the rate of quorum events to avoid hammering the management */
     monitor_protocol_event_throttle(QEVENT_QUORUM_REPORT_BAD, 1000);
     monitor_protocol_event_throttle(QEVENT_QUORUM_FAILURE, 1000);
+
+    qmp_event_set_func_emit(monitor_event_emit);
 }
 
 /**
diff --git a/qapi-schema.json b/qapi-schema.json
index b68cd44..62918c5 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4686,3 +4686,16 @@
               'btn'     : 'InputBtnEvent',
               'rel'     : 'InputMoveEvent',
               'abs'     : 'InputMoveEvent' } }
+
+##
+# @RTC_CHANGE
+#
+# Emitted when the guest changes the RTC time.
+#
+# @offset: Offset between base RTC clock (as specified by -rtc base), and
+#          new RTC clock value
+#
+# Since: 2.1
+##
+{ 'event': 'RTC_CHANGE',
+  'data': { 'offset' : 'int' } }
diff --git a/vl.c b/vl.c
index f0fe48b..08a0e56 100644
--- a/vl.c
+++ b/vl.c
@@ -117,6 +117,7 @@ int main(int argc, char **argv)
 #include "ui/qemu-spice.h"
 #include "qapi/string-input-visitor.h"
 #include "qom/object_interfaces.h"
+#include "qapi-event.h"
 
 #define DEFAULT_RAM_SIZE 128
 
@@ -723,11 +724,7 @@ int qemu_timedate_diff(struct tm *tm)
 
 void rtc_change_mon_event(struct tm *tm)
 {
-    QObject *data;
-
-    data = qobject_from_jsonf("{ 'offset': %d }", qemu_timedate_diff(tm));
-    monitor_protocol_event(QEVENT_RTC_CHANGE, data);
-    qobject_decref(data);
+    qapi_event_send_rtc_change(qemu_timedate_diff(tm), NULL);
 }
 
 static void configure_rtc_date_offset(const char *startdate, int legacy)
-- 
1.7.1