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qapi: Split up check_type()
check_type() can check type names, arrays, and implicit struct types. Callers pass flags to select from this menu. This makes the function somewhat hard to read. Moreover, a few minor bugs are hiding in there, as we'll see shortly. Split it into check_type_name(), check_type_name_or_array(), and check_type_name_or_implicit(). Each of them is a copy of the original specialized to a certain set of flags. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20230316071325.492471-5-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [Commit message corrected]
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@ -333,62 +333,74 @@ def normalize_members(members: object) -> None:
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members[key] = {'type': arg}
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def check_type(value: Optional[object],
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info: QAPISourceInfo,
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source: str,
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allow_array: bool = False,
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allow_dict: Union[bool, str] = False) -> None:
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"""
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Normalize and validate the QAPI type of ``value``.
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Python types of ``str`` or ``None`` are always allowed.
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:param value: The value to check.
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:param info: QAPI schema source file information.
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:param source: Error string describing this ``value``.
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:param allow_array:
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Allow a ``List[str]`` of length 1, which indicates an array of
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the type named by the list element.
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:param allow_dict:
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Allow a dict. Its members can be struct type members or union
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branches. When the value of ``allow_dict`` is in pragma
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``member-name-exceptions``, the dict's keys may violate the
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member naming rules. The dict members are normalized in place.
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:raise QAPISemError: When ``value`` fails validation.
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:return: None, ``value`` is normalized in-place as needed.
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"""
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def check_type_name(value: Optional[object],
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info: QAPISourceInfo, source: str) -> None:
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if value is None:
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return
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# Type name
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if isinstance(value, str):
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return
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# Array type
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if isinstance(value, list):
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if not allow_array:
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raise QAPISemError(info, "%s cannot be an array" % source)
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raise QAPISemError(info, "%s should be a type name" % source)
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def check_type_name_or_array(value: Optional[object],
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info: QAPISourceInfo, source: str) -> None:
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if value is None:
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return
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if isinstance(value, str):
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return
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if isinstance(value, list):
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if len(value) != 1 or not isinstance(value[0], str):
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raise QAPISemError(info,
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"%s: array type must contain single type name" %
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source)
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return
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# Anonymous type
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raise QAPISemError(info,
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"%s should be a type name" % source)
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if not allow_dict:
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raise QAPISemError(info, "%s should be a type name" % source)
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def check_type_name_or_implicit(value: Optional[object],
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info: QAPISourceInfo, source: str,
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parent_name: Optional[str]) -> None:
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"""
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Normalize and validate an optional implicit struct type.
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Accept ``None``, ``str``, or a ``dict`` defining an implicit
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struct type. The latter is normalized in place.
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:param value: The value to check.
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:param info: QAPI schema source file information.
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:param source: Error string describing this ``value``.
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:param parent_name:
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When the value of ``parent_name`` is in pragma
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``member-name-exceptions``, an implicit struct type may
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violate the member naming rules.
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:raise QAPISemError: When ``value`` fails validation.
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:return: None
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"""
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if value is None:
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return
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if isinstance(value, str):
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return
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if isinstance(value, list):
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raise QAPISemError(info, "%s cannot be an array" % source)
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if not isinstance(value, dict):
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raise QAPISemError(info,
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"%s should be an object or type name" % source)
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permissive = False
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if isinstance(allow_dict, str):
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permissive = allow_dict in info.pragma.member_name_exceptions
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permissive = parent_name in info.pragma.member_name_exceptions
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# value is a dictionary, check that each member is okay
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for (key, arg) in value.items():
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key_source = "%s member '%s'" % (source, key)
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if key.startswith('*'):
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@ -401,7 +413,7 @@ def check_type(value: Optional[object],
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check_keys(arg, info, key_source, ['type'], ['if', 'features'])
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check_if(arg, info, key_source)
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check_features(arg.get('features'), info)
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check_type(arg['type'], info, key_source, allow_array=True)
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check_type_name_or_array(arg['type'], info, key_source)
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def check_features(features: Optional[object],
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@ -489,8 +501,8 @@ def check_struct(expr: QAPIExpression) -> None:
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name = cast(str, expr['struct']) # Checked in check_exprs
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members = expr['data']
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check_type(members, expr.info, "'data'", allow_dict=name)
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check_type(expr.get('base'), expr.info, "'base'")
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check_type_name_or_implicit(members, expr.info, "'data'", name)
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check_type_name(expr.get('base'), expr.info, "'base'")
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def check_union(expr: QAPIExpression) -> None:
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@ -508,7 +520,7 @@ def check_union(expr: QAPIExpression) -> None:
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members = expr['data']
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info = expr.info
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check_type(base, info, "'base'", allow_dict=name)
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check_type_name_or_implicit(base, info, "'base'", name)
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check_name_is_str(discriminator, info, "'discriminator'")
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if not isinstance(members, dict):
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@ -518,7 +530,7 @@ def check_union(expr: QAPIExpression) -> None:
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source = "'data' member '%s'" % key
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check_keys(value, info, source, ['type'], ['if'])
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check_if(value, info, source)
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check_type(value['type'], info, source)
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check_type_name(value['type'], info, source)
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def check_alternate(expr: QAPIExpression) -> None:
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@ -544,7 +556,7 @@ def check_alternate(expr: QAPIExpression) -> None:
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check_name_lower(key, info, source)
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check_keys(value, info, source, ['type'], ['if'])
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check_if(value, info, source)
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check_type(value['type'], info, source, allow_array=True)
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check_type_name_or_array(value['type'], info, source)
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def check_command(expr: QAPIExpression) -> None:
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@ -560,10 +572,13 @@ def check_command(expr: QAPIExpression) -> None:
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rets = expr.get('returns')
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boxed = expr.get('boxed', False)
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if boxed and args is None:
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if boxed:
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if args is None:
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raise QAPISemError(expr.info, "'boxed': true requires 'data'")
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check_type(args, expr.info, "'data'", allow_dict=not boxed)
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check_type(rets, expr.info, "'returns'", allow_array=True)
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check_type_name(args, expr.info, "'data'")
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else:
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check_type_name_or_implicit(args, expr.info, "'data'", None)
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check_type_name_or_array(rets, expr.info, "'returns'")
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def check_event(expr: QAPIExpression) -> None:
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@ -578,9 +593,12 @@ def check_event(expr: QAPIExpression) -> None:
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args = expr.get('data')
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boxed = expr.get('boxed', False)
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if boxed and args is None:
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if boxed:
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if args is None:
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raise QAPISemError(expr.info, "'boxed': true requires 'data'")
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check_type(args, expr.info, "'data'", allow_dict=not boxed)
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check_type_name(args, expr.info, "'data'")
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else:
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check_type_name_or_implicit(args, expr.info, "'data'", None)
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def check_exprs(exprs: List[QAPIExpression]) -> List[QAPIExpression]:
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