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/*

 * Core Definitions for QAPI/QMP Dispatch

 *

 * Copyright IBM, Corp. 2011

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.

 * See the COPYING.LIB file in the top-level directory.

 *

 */

#include "qemu-objects.h"

#include "qapi/qmp-core.h"

#include "json-parser.h"

#include "qapi-types.h"

#include "error.h"

#include "qerror.h"

static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp)

{

    const QDictEntry *ent;

    const char *arg_name;

    const QObject *arg_obj;

    bool has_exec_key = false;

    QDict *dict = NULL;

    if (qobject_type(request) != QTYPE_QDICT) {

        error_set(errp, QERR_QMP_BAD_INPUT_OBJECT,

                  "request is not a dictionary");

        return NULL;

    }

    dict = qobject_to_qdict(request);

    for (ent = qdict_first(dict); ent;

         ent = qdict_next(dict, ent)) {

        arg_name = qdict_entry_key(ent);

        arg_obj = qdict_entry_value(ent);

        if (!strcmp(arg_name, "execute")) {

            if (qobject_type(arg_obj) != QTYPE_QSTRING) {

                error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute",

                          "string");

                return NULL;

            }

            has_exec_key = true;

        } else if (strcmp(arg_name, "arguments")) {

            error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name);

            return NULL;

        }

    }

    if (!has_exec_key) {

        error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute");

        return NULL;

    }

    return dict;

}

static QObject *do_qmp_dispatch(QObject *request, Error **errp)

{

    const char *command;

    QDict *args, *dict;

    QmpCommand *cmd;

    QObject *ret = NULL;

    dict = qmp_dispatch_check_obj(request, errp);

    if (!dict || error_is_set(errp)) {

        return NULL;

    }

    command = qdict_get_str(dict, "execute");

    cmd = qmp_find_command(command);

    if (cmd == NULL) {

        error_set(errp, QERR_COMMAND_NOT_FOUND, command);

        return NULL;

    }

    if (!cmd->enabled) {

        error_set(errp, QERR_COMMAND_DISABLED, command);

        return NULL;

    }

    if (!qdict_haskey(dict, "arguments")) {

        args = qdict_new();

    } else {

        args = qdict_get_qdict(dict, "arguments");

        QINCREF(args);

    }

    switch (cmd->type) {

    case QCT_NORMAL:

        cmd->fn(args, &ret, errp);

        if (!error_is_set(errp)) {

            if (cmd->options & QCO_NO_SUCCESS_RESP) {

                g_assert(!ret);

            } else if (!ret) {

                ret = QOBJECT(qdict_new());

            }

        }

        break;

    }

    QDECREF(args);

    return ret;

}

QObject *qmp_build_error_object(Error *errp)

{

    return qobject_from_jsonf("{ 'class': %s, 'desc': %s }",

                              ErrorClass_lookup[error_get_class(errp)],

                              error_get_pretty(errp));

}

QObject *qmp_dispatch(QObject *request)

{

    Error *err = NULL;

    QObject *ret;

    QDict *rsp;

    ret = do_qmp_dispatch(request, &err);

    rsp = qdict_new();

    if (err) {

        qdict_put_obj(rsp, "error", qmp_build_error_object(err));

        error_free(err);

    } else if (ret) {

        qdict_put_obj(rsp, "return", ret);

    } else {

        QDECREF(rsp);

        return NULL;

    }

    return QOBJECT(rsp);

}