提交 d34b867d 编写于 作者: L Luiz Capitulino 提交者: Michael Roth

qapi: add support for command options

Options allow for changes in commands behavior. This commit introduces
the QCO_NO_SUCCESS_RESP option, which causes a command to not emit a
success response.

This is needed by commands such as qemu-ga's guest-shutdown, which
may not be able to complete before the VM vanishes. In this case, it's
useful and simpler not to bother sending a success response.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
上级 76ee152a
......@@ -25,16 +25,24 @@ typedef enum QmpCommandType
QCT_NORMAL,
} QmpCommandType;
typedef enum QmpCommandOptions
{
QCO_NO_OPTIONS = 0x0,
QCO_NO_SUCCESS_RESP = 0x1,
} QmpCommandOptions;
typedef struct QmpCommand
{
const char *name;
QmpCommandType type;
QmpCommandFunc *fn;
QmpCommandOptions options;
QTAILQ_ENTRY(QmpCommand) node;
bool enabled;
} QmpCommand;
void qmp_register_command(const char *name, QmpCommandFunc *fn);
void qmp_register_command(const char *name, QmpCommandFunc *fn,
QmpCommandOptions options);
QmpCommand *qmp_find_command(const char *name);
QObject *qmp_dispatch(QObject *request);
void qmp_disable_command(const char *name);
......
......@@ -94,8 +94,12 @@ static QObject *do_qmp_dispatch(QObject *request, Error **errp)
switch (cmd->type) {
case QCT_NORMAL:
cmd->fn(args, &ret, errp);
if (!error_is_set(errp) && ret == NULL) {
ret = QOBJECT(qdict_new());
if (!error_is_set(errp)) {
if (cmd->options & QCO_NO_SUCCESS_RESP) {
g_assert(!ret);
} else if (!ret) {
ret = QOBJECT(qdict_new());
}
}
break;
}
......
......@@ -17,7 +17,8 @@
static QTAILQ_HEAD(QmpCommandList, QmpCommand) qmp_commands =
QTAILQ_HEAD_INITIALIZER(qmp_commands);
void qmp_register_command(const char *name, QmpCommandFunc *fn)
void qmp_register_command(const char *name, QmpCommandFunc *fn,
QmpCommandOptions options)
{
QmpCommand *cmd = g_malloc0(sizeof(*cmd));
......@@ -25,6 +26,7 @@ void qmp_register_command(const char *name, QmpCommandFunc *fn)
cmd->type = QCT_NORMAL;
cmd->fn = fn;
cmd->enabled = true;
cmd->options = options;
QTAILQ_INSERT_TAIL(&qmp_commands, cmd, node);
}
......
......@@ -291,14 +291,24 @@ out:
return ret
def option_value_matches(opt, val, cmd):
if opt in cmd and cmd[opt] == val:
return True
return False
def gen_registry(commands):
registry=""
push_indent()
for cmd in commands:
options = 'QCO_NO_OPTIONS'
if option_value_matches('success-response', 'no', cmd):
options = 'QCO_NO_SUCCESS_RESP'
registry += mcgen('''
qmp_register_command("%(name)s", qmp_marshal_input_%(c_name)s);
qmp_register_command("%(name)s", qmp_marshal_input_%(c_name)s, %(opts)s);
''',
name=cmd['command'], c_name=c_fun(cmd['command']))
name=cmd['command'], c_name=c_fun(cmd['command']),
opts=options)
pop_indent()
ret = mcgen('''
static void qmp_init_marshal(void)
......
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