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qapi: Add feature flags to commands

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Similarly to features for struct types introduce the feature flags also
for commands. This will allow notifying management layers of fixes and
compatible changes in the behaviour of a command which may not be
detectable any other way.

The changes were heavily inspired by commit 6a8c0b5102.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191018081454.21369-3-armbru@redhat.com>
This commit is contained in:
Peter Krempa 2019-10-18 10:14:51 +02:00 • committed by Markus Armbruster
parent 758f272b6d
commit 23394b4c39
8 changed files with 62 additions and 28 deletions
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35
scripts/qapi/expr.py
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@ -185,6 +185,22 @@ def normalize_features(features):
for f in features]
def check_features(features, info):
if features is None:
return
if not isinstance(features, list):
raise QAPISemError(info, "'features' must be an array")
for f in features:
source = "'features' member"
assert isinstance(f, dict)
check_keys(f, info, source, ['name'], ['if'])
check_name_is_str(f['name'], info, source)
source = "%s '%s'" % (source, f['name'])
check_name_str(f['name'], info, source)
check_if(f, info, source)
normalize_if(f)
def normalize_enum(expr):
if isinstance(expr['data'], list):
expr['data'] = [m if isinstance(m, dict) else {'name': m}
@ -217,23 +233,10 @@ def check_enum(expr, info):
def check_struct(expr, info):
name = expr['struct']
members = expr['data']
features = expr.get('features')
check_type(members, info, "'data'", allow_dict=name)
check_type(expr.get('base'), info, "'base'")
if features:
if not isinstance(features, list):
raise QAPISemError(info, "'features' must be an array")
for f in features:
source = "'features' member"
assert isinstance(f, dict)
check_keys(f, info, source, ['name'], ['if'])
check_name_is_str(f['name'], info, source)
source = "%s '%s'" % (source, f['name'])
check_name_str(f['name'], info, source)
check_if(f, info, source)
normalize_if(f)
check_features(expr.get('features'), info)
def check_union(expr, info):
@ -283,6 +286,7 @@ def check_command(expr, info):
raise QAPISemError(info, "'boxed': true requires 'data'")
check_type(args, info, "'data'", allow_dict=not boxed)
check_type(rets, info, "'returns'", allow_array=True)
check_features(expr.get('features'), info)
def check_event(expr, info):
@ -358,10 +362,11 @@ def check_exprs(exprs):
elif meta == 'command':
check_keys(expr, info, meta,
['command'],
['data', 'returns', 'boxed', 'if',
['data', 'returns', 'boxed', 'if', 'features',
'gen', 'success-response', 'allow-oob',
'allow-preconfig'])
normalize_members(expr.get('data'))
normalize_features(expr.get('features'))
check_command(expr, info)
elif meta == 'event':
check_keys(expr, info, meta,