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# -*- Mode: Python -*-
# vim: filetype=python
#
# Copyright (C) 2015 Red Hat, Inc.
#
# Authors:
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.
##
# = QMP introspection
##
##
# @query-qmp-schema:
#
# Command query-qmp-schema exposes the QMP wire ABI as an array of
# SchemaInfo. This lets QMP clients figure out what commands and
# events are available in this QEMU, and their parameters and results.
#
# However, the SchemaInfo can't reflect all the rules and restrictions
# that apply to QMP. It's interface introspection (figuring out
# what's there), not interface specification. The specification is in
# the QAPI schema.
#
# Furthermore, while we strive to keep the QMP wire format
# backwards-compatible across qemu versions, the introspection output
# is not guaranteed to have the same stability. For example, one
# version of qemu may list an object member as an optional
# non-variant, while another lists the same member only through the
# object's variants; or the type of a member may change from a generic
# string into a specific enum or from one specific type into an
# alternate that includes the original type alongside something else.
#
# Returns: array of @SchemaInfo, where each element describes an
# entity in the ABI: command, event, type, ...
#
# The order of the various SchemaInfo is unspecified; however, all
# names are guaranteed to be unique (no name will be duplicated
# with different meta-types).
#
# Note: the QAPI schema is also used to help define *internal*
# interfaces, by defining QAPI types. These are not part of the
# QMP wire ABI, and therefore not returned by this command.
#
# Since: 2.5
##
{ 'command': 'query-qmp-schema',
'returns': [ 'SchemaInfo' ],
'allow-preconfig': true }
##
# @SchemaMetaType:
#
# This is a @SchemaInfo's meta type, i.e. the kind of entity it
# describes.
#
# @builtin: a predefined type such as 'int' or 'bool'.
#
# @enum: an enumeration type
#
# @array: an array type
#
# @object: an object type (struct or union)
#
# @alternate: an alternate type
#
# @command: a QMP command
#
# @event: a QMP event
#
# Since: 2.5
##
{ 'enum': 'SchemaMetaType',
'data': [ 'builtin', 'enum', 'array', 'object', 'alternate',
'command', 'event' ] }
##
# @SchemaInfo:
#
# @name: the entity's name, inherited from @base. The SchemaInfo is
# always referenced by this name. Commands and events have the
# name defined in the QAPI schema. Unlike command and event
# names, type names are not part of the wire ABI. Consequently,
# type names are meaningless strings here, although they are still
# guaranteed unique regardless of @meta-type.
#
# @meta-type: the entity's meta type, inherited from @base.
#
# @features: names of features associated with the entity, in no
# particular order. (since 4.1 for object types, 4.2 for
# commands, 5.0 for the rest)
#
# Since: 2.5
##
{ 'union': 'SchemaInfo',
'base': { 'name': 'str', 'meta-type': 'SchemaMetaType',
'*features': [ 'str' ] },
'discriminator': 'meta-type',
'data': {
'builtin': 'SchemaInfoBuiltin',
'enum': 'SchemaInfoEnum',
'array': 'SchemaInfoArray',
'object': 'SchemaInfoObject',
'alternate': 'SchemaInfoAlternate',
'command': 'SchemaInfoCommand',
'event': 'SchemaInfoEvent' } }
##
# @SchemaInfoBuiltin:
#
# Additional SchemaInfo members for meta-type 'builtin'.
#
# @json-type: the JSON type used for this type on the wire.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoBuiltin',
'data': { 'json-type': 'JSONType' } }
##
# @JSONType:
#
# The four primitive and two structured types according to RFC 8259
# section 1, plus 'int' (split off 'number'), plus the obvious top
# type 'value'.
#
# Since: 2.5
##
{ 'enum': 'JSONType',
'data': [ 'string', 'number', 'int', 'boolean', 'null',
'object', 'array', 'value' ] }
##
# @SchemaInfoEnum:
#
# Additional SchemaInfo members for meta-type 'enum'.
#
# @members: the enum type's members, in no particular order (since
# 6.2).
#
# @values: the enumeration type's member names, in no particular
# order. Redundant with @members. Just for backward
# compatibility.
#
# Features:
#
# @deprecated: Member @values is deprecated. Use @members instead.
#
# Values of this type are JSON string on the wire.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoEnum',
'data': { 'members': [ 'SchemaInfoEnumMember' ],
'values': { 'type': [ 'str' ],
'features': [ 'deprecated' ] } } }
##
# @SchemaInfoEnumMember:
#
# An object member.
#
# @name: the member's name, as defined in the QAPI schema.
#
# @features: names of features associated with the member, in no
# particular order.
#
# Since: 6.2
##
{ 'struct': 'SchemaInfoEnumMember',
'data': { 'name': 'str', '*features': [ 'str' ] } }
##
# @SchemaInfoArray:
#
# Additional SchemaInfo members for meta-type 'array'.
#
# @element-type: the array type's element type.
#
# Values of this type are JSON array on the wire.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoArray',
'data': { 'element-type': 'str' } }
##
# @SchemaInfoObject:
#
# Additional SchemaInfo members for meta-type 'object'.
#
# @members: the object type's (non-variant) members, in no particular
# order.
#
# @tag: the name of the member serving as type tag. An element of
# @members with this name must exist.
#
# @variants: variant members, i.e. additional members that depend on
# the type tag's value. Present exactly when @tag is present.
# The variants are in no particular order, and may even differ
# from the order of the values of the enum type of the @tag.
#
# Values of this type are JSON object on the wire.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoObject',
'data': { 'members': [ 'SchemaInfoObjectMember' ],
'*tag': 'str',
'*variants': [ 'SchemaInfoObjectVariant' ] } }
##
# @SchemaInfoObjectMember:
#
# An object member.
#
# @name: the member's name, as defined in the QAPI schema.
#
# @type: the name of the member's type.
#
# @default: default when used as command parameter. If absent, the
# parameter is mandatory. If present, the value must be null.
# The parameter is optional, and behavior when it's missing is not
# specified here. Future extension: if present and non-null, the
# parameter is optional, and defaults to this value.
#
# @features: names of features associated with the member, in no
# particular order. (since 5.0)
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoObjectMember',
'data': { 'name': 'str', 'type': 'str', '*default': 'any',
# @default's type must be null or match @type
'*features': [ 'str' ] } }
##
# @SchemaInfoObjectVariant:
#
# The variant members for a value of the type tag.
#
# @case: a value of the type tag.
#
# @type: the name of the object type that provides the variant members
# when the type tag has value @case.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoObjectVariant',
'data': { 'case': 'str', 'type': 'str' } }
##
# @SchemaInfoAlternate:
#
# Additional SchemaInfo members for meta-type 'alternate'.
#
# @members: the alternate type's members, in no particular order. The
# members' wire encoding is distinct, see
# :doc:`/devel/qapi-code-gen` section Alternate types.
#
# On the wire, this can be any of the members.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoAlternate',
'data': { 'members': [ 'SchemaInfoAlternateMember' ] } }
##
# @SchemaInfoAlternateMember:
#
# An alternate member.
#
# @type: the name of the member's type.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoAlternateMember',
'data': { 'type': 'str' } }
##
# @SchemaInfoCommand:
#
# Additional SchemaInfo members for meta-type 'command'.
#
# @arg-type: the name of the object type that provides the command's
# parameters.
#
# @ret-type: the name of the command's result type.
#
# @allow-oob: whether the command allows out-of-band execution,
# defaults to false (Since: 2.12)
#
# TODO: @success-response (currently irrelevant, because it's QGA, not
# QMP)
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoCommand',
'data': { 'arg-type': 'str', 'ret-type': 'str',
'*allow-oob': 'bool' } }
##
# @SchemaInfoEvent:
#
# Additional SchemaInfo members for meta-type 'event'.
#
# @arg-type: the name of the object type that provides the event's
# parameters.
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoEvent',
'data': { 'arg-type': 'str' } }