qemu/include/qapi/qobject-input-visitor.h
Markus Armbruster db29164103 qapi: Implement deprecated-input=reject for QMP command arguments
This policy rejects deprecated input, and thus permits "testing the
future".  Implement it for QMP command arguments: reject commands with
deprecated ones.  Example: when QEMU is run with -compat
deprecated-input=reject, then

    {"execute": "eject", "arguments": {"device": "cd"}}

fails like this

    {"error": {"class": "GenericError", "desc": "Deprecated parameter 'device' disabled by policy"}}

When the deprecated parameter is removed, the error will change to

    {"error": {"class": "GenericError", "desc": "Parameter 'device' is unexpected"}}

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210318155519.1224118-11-armbru@redhat.com>
2021-03-19 16:05:11 +01:00

87 lines
3.1 KiB
C

/*
* Input Visitor
*
* Copyright (C) 2017 Red Hat, Inc.
* 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.
*
*/
#ifndef QOBJECT_INPUT_VISITOR_H
#define QOBJECT_INPUT_VISITOR_H
#include "qapi/qapi-types-compat.h"
#include "qapi/visitor.h"
typedef struct QObjectInputVisitor QObjectInputVisitor;
/*
* Create a QObject input visitor for @obj
*
* A QObject input visitor visit builds a QAPI object from a QObject.
* This simultaneously walks the QAPI object being built and the
* QObject. The latter walk starts at @obj.
*
* visit_type_FOO() creates an instance of QAPI type FOO. The visited
* QObject must match FOO. QDict matches struct/union types, QList
* matches list types, QString matches type 'str' and enumeration
* types, QNum matches integer and float types, QBool matches type
* 'bool'. Type 'any' is matched by QObject. A QAPI alternate type
* is matched when one of its member types is.
*
* visit_start_struct() ... visit_end_struct() visits a QDict and
* creates a QAPI struct/union. Visits in between visit the
* dictionary members. visit_optional() is true when the QDict has
* this member. visit_check_struct() fails if unvisited members
* remain.
*
* visit_start_list() ... visit_end_list() visits a QList and creates
* a QAPI list. Visits in between visit list members, one after the
* other. visit_next_list() returns NULL when all QList members have
* been visited. visit_check_list() fails if unvisited members
* remain.
*
* visit_start_alternate() ... visit_end_alternate() visits a QObject
* and creates a QAPI alternate. The visit in between visits the same
* QObject and initializes the alternate member that is in use.
*
* Error messages refer to parts of @obj in JavaScript/Python syntax.
* For example, 'a.b[2]' refers to the second member of the QList
* member 'b' of the QDict member 'a' of QDict @obj.
*
* The caller is responsible for freeing the visitor with
* visit_free().
*/
Visitor *qobject_input_visitor_new(QObject *obj);
void qobject_input_visitor_set_policy(Visitor *v,
CompatPolicyInput deprecated);
/*
* Create a QObject input visitor for @obj for use with keyval_parse()
*
* This is like qobject_input_visitor_new(), except scalars are all
* QString, and error messages refer to parts of @obj in the syntax
* keyval_parse() uses for KEYs.
*/
Visitor *qobject_input_visitor_new_keyval(QObject *obj);
/*
* Create a QObject input visitor for parsing @str.
*
* If @str looks like JSON, parse it as JSON, else as KEY=VALUE,...
* @implied_key applies to KEY=VALUE, and works as in keyval_parse().
* On failure, store an error through @errp and return NULL.
* On success, return a new QObject input visitor for the parse.
*/
Visitor *qobject_input_visitor_new_str(const char *str,
const char *implied_key,
Error **errp);
#endif