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ee16ce9337
Using error_is_set(ERRP) to find out whether a function failed is
either wrong, fragile, or unnecessarily opaque. It's wrong when ERRP
may be null, because errors go undetected when it is. It's fragile
when proving ERRP non-null involves a non-local argument. Else, it's
unnecessarily opaque (see commit 84d18f0).
The error_is_set(errp) in do_qmp_dispatch() is merely fragile, because
the caller never passes a null errp argument.
Make the code more robust and more obviously correct: receive the
error in a local variable, then propagate it through the parameter.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/*
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* Core Definitions for QAPI/QMP Dispatch
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qapi/qmp/types.h"
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#include "qapi/qmp/dispatch.h"
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#include "qapi/qmp/json-parser.h"
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#include "qapi-types.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp)
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{
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const QDictEntry *ent;
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const char *arg_name;
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const QObject *arg_obj;
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bool has_exec_key = false;
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QDict *dict = NULL;
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if (qobject_type(request) != QTYPE_QDICT) {
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error_set(errp, QERR_QMP_BAD_INPUT_OBJECT,
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"request is not a dictionary");
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return NULL;
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}
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dict = qobject_to_qdict(request);
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for (ent = qdict_first(dict); ent;
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ent = qdict_next(dict, ent)) {
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arg_name = qdict_entry_key(ent);
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arg_obj = qdict_entry_value(ent);
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if (!strcmp(arg_name, "execute")) {
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if (qobject_type(arg_obj) != QTYPE_QSTRING) {
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error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute",
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"string");
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return NULL;
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}
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has_exec_key = true;
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} else if (strcmp(arg_name, "arguments")) {
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error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name);
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return NULL;
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}
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}
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if (!has_exec_key) {
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error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute");
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return NULL;
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}
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return dict;
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}
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static QObject *do_qmp_dispatch(QObject *request, Error **errp)
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{
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Error *local_err = NULL;
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const char *command;
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QDict *args, *dict;
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QmpCommand *cmd;
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QObject *ret = NULL;
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dict = qmp_dispatch_check_obj(request, errp);
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if (!dict) {
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return NULL;
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}
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command = qdict_get_str(dict, "execute");
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cmd = qmp_find_command(command);
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if (cmd == NULL) {
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error_set(errp, QERR_COMMAND_NOT_FOUND, command);
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return NULL;
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}
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if (!cmd->enabled) {
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error_setg(errp, "The command %s has been disabled for this instance",
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command);
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return NULL;
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}
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if (!qdict_haskey(dict, "arguments")) {
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args = qdict_new();
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} else {
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args = qdict_get_qdict(dict, "arguments");
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QINCREF(args);
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}
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switch (cmd->type) {
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case QCT_NORMAL:
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cmd->fn(args, &ret, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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} else if (cmd->options & QCO_NO_SUCCESS_RESP) {
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g_assert(!ret);
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} else if (!ret) {
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ret = QOBJECT(qdict_new());
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}
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break;
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}
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QDECREF(args);
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return ret;
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}
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QObject *qmp_build_error_object(Error *err)
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{
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return qobject_from_jsonf("{ 'class': %s, 'desc': %s }",
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ErrorClass_lookup[error_get_class(err)],
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error_get_pretty(err));
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}
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QObject *qmp_dispatch(QObject *request)
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{
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Error *err = NULL;
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QObject *ret;
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QDict *rsp;
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ret = do_qmp_dispatch(request, &err);
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rsp = qdict_new();
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if (err) {
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qdict_put_obj(rsp, "error", qmp_build_error_object(err));
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error_free(err);
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} else if (ret) {
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qdict_put_obj(rsp, "return", ret);
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} else {
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QDECREF(rsp);
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return NULL;
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}
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return QOBJECT(rsp);
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}
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