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qobject: Change qobject_to_json()'s value to GString

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qobject_to_json() and qobject_to_json_pretty() build a GString, then
covert it to QString.  Just one of the callers actually needs a
QString: qemu_rbd_parse_filename().  A few others need a string they
can modify: qmp_send_response(), qga's send_response(), to_json_str(),
and qmp_fd_vsend_fds().  The remainder just need a string.

Change qobject_to_json() and qobject_to_json_pretty() to return the
GString.

qemu_rbd_parse_filename() now has to convert to QString.  All others
save a QString temporary.  to_json_str() actually becomes a bit
simpler, because GString provides more convenient modification
functions.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-6-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2020-12-11 18:11:37 +01:00
parent f1cc129df8
commit eab3a4678b
12 changed files with 79 additions and 93 deletions
Download patch file Download diff file Expand all files Collapse all files

22
qga/main.c
View file

@ -22,7 +22,6 @@
#include "qapi/qmp/json-parser.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qjson.h"
#include "qapi/qmp/qstring.h"
#include "guest-agent-core.h"
#include "qga-qapi-init-commands.h"
#include "qapi/qmp/qerror.h"
@ -528,8 +527,7 @@ fail:
static int send_response(GAState *s, const QDict *rsp)
{
const char *buf;
QString *payload_qstr, *response_qstr;
GString *response;
GIOStatus status;
g_assert(s->channel);
@ -538,25 +536,19 @@ static int send_response(GAState *s, const QDict *rsp)
return 0;
}
payload_qstr = qobject_to_json(QOBJECT(rsp));
if (!payload_qstr) {
response = qobject_to_json(QOBJECT(rsp));
if (!response) {
return -EINVAL;
}
if (s->delimit_response) {
s->delimit_response = false;
response_qstr = qstring_new();
qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
qstring_append(response_qstr, qstring_get_str(payload_qstr));
qobject_unref(payload_qstr);
} else {
response_qstr = payload_qstr;
g_string_prepend_c(response, QGA_SENTINEL_BYTE);
}
qstring_append_chr(response_qstr, '\n');
buf = qstring_get_str(response_qstr);
status = ga_channel_write_all(s->channel, buf, strlen(buf));
qobject_unref(response_qstr);
g_string_append_c(response, '\n');
status = ga_channel_write_all(s->channel, response->str, response->len);
g_string_free(response, true);
if (status != G_IO_STATUS_NORMAL) {
return -EIO;
}