mirror of https://gitee.com/openkylin/qemu.git
monitor: use qmp_dispatch()
Replace the old manual dispatch and validation code by the generic one provided by qapi common code. Note that it is now possible to call the following commands that used to be disabled by compile-time conditionals: - dump-skeys - query-spice - rtc-reset-reinjection - query-gic-capabilities Their fallback functions return an appropriate "feature disabled" error. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20160912091913.15831-16-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Marc-André Lureau
Markus Armbruster
parent
4bdadd8671
commit
5c678ee8d9
330
monitor.c
330
monitor.c
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@ -166,7 +166,6 @@ struct MonFdset {
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};
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typedef struct {
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QObject *id;
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JSONMessageParser parser;
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/*
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* When a client connects, we're in capabilities negotiation mode.
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@ -229,8 +228,6 @@ static int mon_refcount;
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static mon_cmd_t mon_cmds[];
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static mon_cmd_t info_cmds[];
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static const mon_cmd_t qmp_cmds[];
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Monitor *cur_mon;
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static QEMUClockType event_clock_type = QEMU_CLOCK_REALTIME;
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@ -401,49 +398,6 @@ static void monitor_json_emitter(Monitor *mon, const QObject *data)
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QDECREF(json);
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}
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static QDict *build_qmp_error_dict(Error *err)
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{
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QObject *obj;
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obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %s } }",
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QapiErrorClass_lookup[error_get_class(err)],
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error_get_pretty(err));
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return qobject_to_qdict(obj);
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}
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static void monitor_protocol_emitter(Monitor *mon, QObject *data,
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Error *err)
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{
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QDict *qmp;
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trace_monitor_protocol_emitter(mon);
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if (!err) {
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/* success response */
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qmp = qdict_new();
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if (data) {
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qobject_incref(data);
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qdict_put_obj(qmp, "return", data);
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} else {
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/* return an empty QDict by default */
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qdict_put(qmp, "return", qdict_new());
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}
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} else {
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/* error response */
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qmp = build_qmp_error_dict(err);
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}
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if (mon->qmp.id) {
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qdict_put_obj(qmp, "id", mon->qmp.id);
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mon->qmp.id = NULL;
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}
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monitor_json_emitter(mon, QOBJECT(qmp));
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QDECREF(qmp);
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}
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static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT__MAX] = {
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/* Limit guest-triggerable events to 1 per second */
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[QAPI_EVENT_RTC_CHANGE] = { 1000 * SCALE_MS },
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@ -2211,11 +2165,6 @@ static mon_cmd_t mon_cmds[] = {
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{ NULL, NULL, },
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};
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static const mon_cmd_t qmp_cmds[] = {
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#include "qmp-commands-old.h"
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{ /* NULL */ },
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};
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/*******************************************************************/
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static const char *pch;
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@ -2566,11 +2515,6 @@ static const mon_cmd_t *search_dispatch_table(const mon_cmd_t *disp_table,
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return NULL;
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}
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static const mon_cmd_t *qmp_find_cmd(const char *cmdname)
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{
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return search_dispatch_table(qmp_cmds, cmdname);
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}
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/*
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* Parse command name from @cmdp according to command table @table.
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* If blank, return NULL.
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@ -3721,199 +3665,6 @@ static bool invalid_qmp_mode(const Monitor *mon, const char *cmd,
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return false;
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}
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/*
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* Argument validation rules:
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*
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* 1. The argument must exist in cmd_args qdict
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* 2. The argument type must be the expected one
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*
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* Special case: If the argument doesn't exist in cmd_args and
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* the QMP_ACCEPT_UNKNOWNS flag is set, then the
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* checking is skipped for it.
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*/
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static void check_client_args_type(const QDict *client_args,
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const QDict *cmd_args, int flags,
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Error **errp)
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{
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const QDictEntry *ent;
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for (ent = qdict_first(client_args); ent;ent = qdict_next(client_args,ent)){
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QObject *obj;
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QString *arg_type;
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const QObject *client_arg = qdict_entry_value(ent);
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const char *client_arg_name = qdict_entry_key(ent);
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obj = qdict_get(cmd_args, client_arg_name);
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if (!obj) {
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if (flags & QMP_ACCEPT_UNKNOWNS) {
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/* handler accepts unknowns */
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continue;
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}
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/* client arg doesn't exist */
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error_setg(errp, QERR_INVALID_PARAMETER, client_arg_name);
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return;
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}
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arg_type = qobject_to_qstring(obj);
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assert(arg_type != NULL);
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/* check if argument's type is correct */
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switch (qstring_get_str(arg_type)[0]) {
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case 'F':
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case 'B':
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case 's':
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if (qobject_type(client_arg) != QTYPE_QSTRING) {
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error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
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client_arg_name, "string");
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return;
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}
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break;
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case 'i':
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case 'l':
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case 'M':
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case 'o':
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if (qobject_type(client_arg) != QTYPE_QINT) {
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error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
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client_arg_name, "int");
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return;
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}
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break;
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case 'T':
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if (qobject_type(client_arg) != QTYPE_QINT &&
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qobject_type(client_arg) != QTYPE_QFLOAT) {
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error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
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client_arg_name, "number");
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return;
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}
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break;
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case 'b':
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case '-':
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if (qobject_type(client_arg) != QTYPE_QBOOL) {
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error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
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client_arg_name, "bool");
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return;
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}
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break;
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case 'O':
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assert(flags & QMP_ACCEPT_UNKNOWNS);
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break;
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case 'q':
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/* Any QObject can be passed. */
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break;
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case '/':
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case '.':
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/*
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* These types are not supported by QMP and thus are not
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* handled here. Fall through.
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*/
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default:
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abort();
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}
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}
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}
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/*
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* - Check if the client has passed all mandatory args
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* - Set special flags for argument validation
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*/
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static void check_mandatory_args(const QDict *cmd_args,
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const QDict *client_args, int *flags,
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Error **errp)
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{
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const QDictEntry *ent;
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for (ent = qdict_first(cmd_args); ent; ent = qdict_next(cmd_args, ent)) {
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const char *cmd_arg_name = qdict_entry_key(ent);
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QString *type = qobject_to_qstring(qdict_entry_value(ent));
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assert(type != NULL);
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if (qstring_get_str(type)[0] == 'O') {
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assert((*flags & QMP_ACCEPT_UNKNOWNS) == 0);
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*flags |= QMP_ACCEPT_UNKNOWNS;
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} else if (qstring_get_str(type)[0] != '-' &&
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qstring_get_str(type)[1] != '?' &&
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!qdict_haskey(client_args, cmd_arg_name)) {
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error_setg(errp, QERR_MISSING_PARAMETER, cmd_arg_name);
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return;
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}
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}
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}
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static QDict *qdict_from_args_type(const char *args_type)
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{
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int i;
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QDict *qdict;
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QString *key, *type, *cur_qs;
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assert(args_type != NULL);
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qdict = qdict_new();
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if (args_type == NULL || args_type[0] == '\0') {
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/* no args, empty qdict */
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goto out;
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}
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key = qstring_new();
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type = qstring_new();
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cur_qs = key;
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for (i = 0;; i++) {
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switch (args_type[i]) {
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case ',':
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case '\0':
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qdict_put(qdict, qstring_get_str(key), type);
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QDECREF(key);
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if (args_type[i] == '\0') {
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goto out;
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}
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type = qstring_new(); /* qdict has ref */
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cur_qs = key = qstring_new();
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break;
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case ':':
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cur_qs = type;
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break;
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default:
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qstring_append_chr(cur_qs, args_type[i]);
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break;
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}
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}
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out:
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return qdict;
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}
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/*
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* Client argument checking rules:
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*
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* 1. Client must provide all mandatory arguments
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* 2. Each argument provided by the client must be expected
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* 3. Each argument provided by the client must have the type expected
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* by the command
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*/
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static void qmp_check_client_args(const mon_cmd_t *cmd, QDict *client_args,
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Error **errp)
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{
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Error *err = NULL;
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int flags;
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QDict *cmd_args;
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cmd_args = qdict_from_args_type(cmd->args_type);
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flags = 0;
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check_mandatory_args(cmd_args, client_args, &flags, &err);
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if (err) {
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goto out;
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}
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check_client_args_type(client_args, cmd_args, flags, &err);
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out:
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error_propagate(errp, err);
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QDECREF(cmd_args);
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}
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/*
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* Input object checking rules
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*
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@ -3972,67 +3723,58 @@ static QDict *qmp_check_input_obj(QObject *input_obj, Error **errp)
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static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)
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{
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Error *local_err = NULL;
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QObject *obj, *data;
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QDict *input, *args;
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const mon_cmd_t *cmd;
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QmpCommand *qcmd;
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QObject *req, *rsp = NULL, *id = NULL;
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QDict *qdict = NULL;
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const char *cmd_name;
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Monitor *mon = cur_mon;
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Error *err = NULL;
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args = input = NULL;
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data = NULL;
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obj = json_parser_parse(tokens, NULL);
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if (!obj) {
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// FIXME: should be triggered in json_parser_parse()
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error_setg(&local_err, QERR_JSON_PARSING);
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req = json_parser_parse_err(tokens, NULL, &err);
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if (err || !req || qobject_type(req) != QTYPE_QDICT) {
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if (!err) {
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error_setg(&err, QERR_JSON_PARSING);
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}
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goto err_out;
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}
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input = qmp_check_input_obj(obj, &local_err);
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if (!input) {
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qobject_decref(obj);
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qdict = qmp_check_input_obj(req, &err);
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if (!qdict) {
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goto err_out;
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}
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mon->qmp.id = qdict_get(input, "id");
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qobject_incref(mon->qmp.id);
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id = qdict_get(qdict, "id");
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qobject_incref(id);
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qdict_del(qdict, "id");
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cmd_name = qdict_get_str(input, "execute");
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cmd_name = qdict_get_str(qdict, "execute");
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trace_handle_qmp_command(mon, cmd_name);
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cmd = qmp_find_cmd(cmd_name);
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qcmd = qmp_find_command(cmd_name);
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if (!qcmd || !cmd) {
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error_set(&local_err, ERROR_CLASS_COMMAND_NOT_FOUND,
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"The command %s has not been found", cmd_name);
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goto err_out;
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}
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if (invalid_qmp_mode(mon, cmd_name, &local_err)) {
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if (invalid_qmp_mode(mon, cmd_name, &err)) {
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goto err_out;
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}
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obj = qdict_get(input, "arguments");
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if (!obj) {
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args = qdict_new();
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} else {
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args = qobject_to_qdict(obj);
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QINCREF(args);
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}
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qmp_check_client_args(cmd, args, &local_err);
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if (local_err) {
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goto err_out;
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}
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qcmd->fn(args, &data, &local_err);
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rsp = qmp_dispatch(req);
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err_out:
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monitor_protocol_emitter(mon, data, local_err);
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qobject_decref(data);
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error_free(local_err);
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QDECREF(input);
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QDECREF(args);
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if (err) {
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qdict = qdict_new();
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qdict_put_obj(qdict, "error", qmp_build_error_object(err));
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error_free(err);
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rsp = QOBJECT(qdict);
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}
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if (rsp) {
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if (id) {
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qdict_put_obj(qobject_to_qdict(rsp), "id", id);
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id = NULL;
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}
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monitor_json_emitter(mon, rsp);
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}
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qobject_decref(id);
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qobject_decref(rsp);
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qobject_decref(req);
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}
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static void monitor_qmp_read(void *opaque, const uint8_t *buf, int size)
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@ -98,7 +98,6 @@ qemu_co_mutex_unlock_return(void *mutex, void *self) "mutex %p self %p"
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# monitor.c
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handle_qmp_command(void *mon, const char *cmd_name) "mon %p cmd_name \"%s\""
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monitor_protocol_emitter(void *mon) "mon %p"
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monitor_protocol_event_handler(uint32_t event, void *qdict) "event=%d data=%p"
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monitor_protocol_event_emit(uint32_t event, void *data) "event=%d data=%p"
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monitor_protocol_event_queue(uint32_t event, void *qdict, uint64_t rate) "event=%d data=%p rate=%" PRId64
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