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qga: process_event() simplification 

Simplify the code around qmp_dispatch():
- rely on qmp_dispatch/check_obj() for message checking
- have a single send_response() point
- constify send_response() argument

It changes a couple of error messages:

* When @req isn't a dictionary, from
    Invalid JSON syntax
  to
    QMP input must be a JSON object

* When @req lacks member "execute", from
    this feature or command is not currently supported
  to
    QMP input lacks member 'execute'

CC: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Marc-André Lureau 2019-02-20 16:42:52 +01:00 committed by Michael Roth
parent 996b9cdc2f
commit 781f2b3d1e
1 changed files with 9 additions and 38 deletions
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47
qga/main.c
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@ -523,15 +523,15 @@ fail:
#endif
}
static int send_response(GAState *s, QDict *payload)
static int send_response(GAState *s, const QDict *rsp)
{
const char *buf;
QString *payload_qstr, *response_qstr;
GIOStatus status;
g_assert(payload && s->channel);
g_assert(rsp && s->channel);
payload_qstr = qobject_to_json(QOBJECT(payload));
payload_qstr = qobject_to_json(QOBJECT(rsp));
if (!payload_qstr) {
return -EINVAL;
}
@ -557,53 +557,24 @@ static int send_response(GAState *s, QDict *payload)
return 0;
}
static void process_command(GAState *s, QDict *req)
{
QDict *rsp;
int ret;
g_assert(req);
g_debug("processing command");
rsp = qmp_dispatch(&ga_commands, QOBJECT(req), false);
if (rsp) {
ret = send_response(s, rsp);
if (ret < 0) {
g_warning("error sending response: %s", strerror(-ret));
}
qobject_unref(rsp);
}
}
/* handle requests/control events coming in over the channel */
static void process_event(void *opaque, QObject *obj, Error *err)
{
GAState *s = opaque;
QDict *req, *rsp;
QDict *rsp;
int ret;
g_debug("process_event: called");
assert(!obj != !err);
if (err) {
goto err;
}
req = qobject_to(QDict, obj);
if (!req) {
error_setg(&err, "Input must be a JSON object");
goto err;
}
if (!qdict_haskey(req, "execute")) {
g_warning("unrecognized payload format");
error_setg(&err, QERR_UNSUPPORTED);
goto err;
rsp = qmp_error_response(err);
goto end;
}
process_command(s, req);
qobject_unref(obj);
return;
g_debug("processing command");
rsp = qmp_dispatch(&ga_commands, obj, false);
err:
g_warning("failed to parse event: %s", error_get_pretty(err));
rsp = qmp_error_response(err);
end:
ret = send_response(s, rsp);
if (ret < 0) {
g_warning("error sending error response: %s", strerror(-ret));