[Qemu-devel] [RFC v2 07/22] monitor: move the cur_mon hack deeper for QMP

[Peter Xu <peterx@redhat.com>]

In monitor_qmp_read(), we have the hack to temporarily replace the
cur_mon pointer.  Now we move this hack deeper inside the QMP dispatcher
routine since the Monitor pointer can be passed in to that using the new
JSON Parser opaque field now.

This does not make much sense as a single patch.  However, this will be
a big step for the next patch, when the QMP dispatcher routine will be
split from the QMP parser.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 monitor.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/monitor.c b/monitor.c
index ebeb54b0d3..f6cd9ba529 100644
--- a/monitor.c
+++ b/monitor.c
@@ -3826,7 +3826,7 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens,
 {
     QObject *req, *rsp = NULL, *id = NULL;
     QDict *qdict = NULL;
-    Monitor *mon = cur_mon;
+    Monitor *mon = opaque, *old_mon;
     Error *err = NULL;
 
     req = json_parser_parse_err(tokens, NULL, &err);
@@ -3851,8 +3851,13 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens,
         QDECREF(req_json);
     }
 
+    old_mon = cur_mon;
+    cur_mon = mon;
+
     rsp = qmp_dispatch(cur_mon->qmp.commands, req);
 
+    cur_mon = old_mon;
+
     if (mon->qmp.commands == &qmp_cap_negotiation_commands) {
         qdict = qdict_get_qdict(qobject_to_qdict(rsp), "error");
         if (qdict
@@ -3889,13 +3894,9 @@ err_out:
 
 static void monitor_qmp_read(void *opaque, const uint8_t *buf, int size)
 {
-    Monitor *old_mon = cur_mon;
-
-    cur_mon = opaque;
-
-    json_message_parser_feed(&cur_mon->qmp.parser, (const char *) buf, size);
+    Monitor *mon = opaque;
 
-    cur_mon = old_mon;
+    json_message_parser_feed(&mon->qmp.parser, (const char *) buf, size);
 }
 
 static void monitor_read(void *opaque, const uint8_t *buf, int size)
@@ -3969,7 +3970,7 @@ static void monitor_qmp_event(void *opaque, int event)
         break;
     case CHR_EVENT_CLOSED:
         json_message_parser_destroy(&mon->qmp.parser);
-        json_message_parser_init(&mon->qmp.parser, handle_qmp_command, NULL);
+        json_message_parser_init(&mon->qmp.parser, handle_qmp_command, mon);
         mon_refcount--;
         monitor_fdsets_cleanup();
         break;
@@ -4119,7 +4120,7 @@ void monitor_init(Chardev *chr, int flags)
         qemu_chr_fe_set_handlers(&mon->chr, monitor_can_read, monitor_qmp_read,
                                  monitor_qmp_event, NULL, mon, NULL, true);
         qemu_chr_fe_set_echo(&mon->chr, true);
-        json_message_parser_init(&mon->qmp.parser, handle_qmp_command, NULL);
+        json_message_parser_init(&mon->qmp.parser, handle_qmp_command, mon);
     } else {
         qemu_chr_fe_set_handlers(&mon->chr, monitor_can_read, monitor_read,
                                  monitor_event, NULL, mon, NULL, true);
-- 
2.13.5