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bh=igXdpddoN154z3gheiDaIM2pkxAGZEJVxhZzCsNwTjc=; b=VRJHWMitfxGE+eV00yoCAuyWwgw95OGQbmGlYik4VA2x40ajRNY509mMl8l6iBRkuOoXp7 lWQHO1utmeETTW7qncMD5azXj5KticNBUdf85T3KogfgpZQYm0BYmZW0gK4m4ph4hhJDJz ElVQo31ZmUFdPg63Q9iPJkDTQi4Ncgg= X-MC-Unique: ZaCI4Ga2P5KuNzYMJVPAcQ-1 From: John Snow To: qemu-devel@nongnu.org, Markus Armbruster Subject: [PATCH v4 12/14] qapi/introspect.py: add introspect.json dummy types Date: Tue, 2 Feb 2021 12:46:49 -0500 Message-Id: <20210202174651.2274166-13-jsnow@redhat.com> In-Reply-To: <20210202174651.2274166-1-jsnow@redhat.com> References: <20210202174651.2274166-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jsnow@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.386, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michael Roth , John Snow , Eduardo Habkost , Cleber Rosa Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Add some aliases that declare intent for some of the "dictly-typed" objects we pass around in introspect.py. Signed-off-by: John Snow --- This patch is optional, it can be dropped if desired. It is purely for the sake of demonstrating what the _DObject was meant to convey: a Python Dict that represents some JSON Object. It does not add any type safety in and of itself, but does have some (light) annotational benefit. In this case, it's usually a specific data structure from the QAPI Schema we are referencing, but do not have "compile-time" access to in Python. These are loosely typed and don't bother reproducing the exact structure of the real types. Python 3.6 does not have support for TypedDict structures, so this is as good as we can do without involving a third-party library (e.g. Pydantic), in which we might be able to say: class SchemaMetaType(str, enum.Enum): BUILTIN =3D "builtin" ENUM =3D "enum" ARRAY =3D "array" OBJECT =3D "object" ALTERNATE =3D "alternate" COMMAND =3D "command" EVENT =3D "event" class SchemaInfo(pydantic.BaseModel): name: str meta-type: SchemaMetaType features: Optional[List[str]] data: Union[SchemaInfoBuiltin, SchemaInfoEnum, SchemaInfoArray, SchemaInfoObject, SchemaInfoAlternate, SchemaInfoCommand, SchemaInfoEvent] However, the cost of reproducing and keeping these structure definitions in-sync between the user-defined portion of the schema and the code generator is likely not worth doing any such thing. However, it does illustrate an interesting dependency the generator has on the user-defined schema itself in terms of types. So, I settled on using some light types that suggest the form of the object instead of enforcing the form. Signed-off-by: John Snow --- scripts/qapi/introspect.py | 49 ++++++++++++++++++++++++-------------- 1 file changed, 31 insertions(+), 18 deletions(-) diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py index b7f2a6cf260..eb5d34cdb42 100644 --- a/scripts/qapi/introspect.py +++ b/scripts/qapi/introspect.py @@ -66,8 +66,15 @@ _value =3D Union[_scalar, _nonscalar] TreeValue =3D Union[_value, 'Annotated[_value]'] =20 -# This is a (strict) alias for an arbitrary object non-scalar, as above: -_DObject =3D Dict[str, object] +# These types are based on structures defined in QEMU's schema, so we lack +# precise types for them here. Python 3.6 does not offer TypedDict constru= cts, +# so they are loosely typed here as simple python Dicts. +SchemaInfo =3D Dict[str, object] +SchemaInfoObject =3D Dict[str, object] +SchemaInfoObjectVariant =3D Dict[str, object] +SchemaInfoObjectMember =3D Dict[str, object] +SchemaInfoCommand =3D Dict[str, object] + =20 _NodeT =3D TypeVar('_NodeT', bound=3DTreeValue) =20 @@ -160,7 +167,7 @@ def __init__(self, prefix: str, unmask: bool): ' * QAPI/QMP schema introspection', __doc__) self._unmask =3D unmask self._schema: Optional[QAPISchema] =3D None - self._trees: List[Annotated[_DObject]] =3D [] + self._trees: List[Annotated[SchemaInfo]] =3D [] self._used_types: List[QAPISchemaType] =3D [] self._name_map: Dict[str, str] =3D {} self._genc.add(mcgen(''' @@ -232,9 +239,18 @@ def _gen_features(features: List[QAPISchemaFeature] ) -> List[Annotated[str]]: return [Annotated(f.name, f.ifcond) for f in features] =20 - def _gen_tree(self, name: str, mtype: str, obj: _DObject, + def _gen_tree(self, name: str, mtype: str, obj: Dict[str, object], ifcond: List[str], features: Optional[List[QAPISchemaFeature]]) -> None: + """ + Build and append a SchemaInfo object to self._trees. + + :param name: The entity's name. + :param mtype: The entity's meta-type. + :param obj: Additional entity fields, as appropriate for the meta-= type. + :param ifcond: List of conditionals that apply to this entire enti= ty. + :param features: Optional features field for SchemaInfo. + """ comment: Optional[str] =3D None if mtype not in ('command', 'event', 'builtin', 'array'): if not self._unmask: @@ -249,8 +265,8 @@ def _gen_tree(self, name: str, mtype: str, obj: _DObjec= t, self._trees.append(Annotated(obj, ifcond, comment)) =20 def _gen_member(self, member: QAPISchemaObjectTypeMember - ) -> Annotated[_DObject]: - obj: _DObject =3D { + ) -> Annotated[SchemaInfoObjectMember]: + obj: SchemaInfoObjectMember =3D { 'name': member.name, 'type': self._use_type(member.type) } @@ -260,13 +276,9 @@ def _gen_member(self, member: QAPISchemaObjectTypeMemb= er obj['features'] =3D self._gen_features(member.features) return Annotated(obj, member.ifcond) =20 - def _gen_variants(self, tag_name: str, - variants: List[QAPISchemaVariant]) -> _DObject: - return {'tag': tag_name, - 'variants': [self._gen_variant(v) for v in variants]} - - def _gen_variant(self, variant: QAPISchemaVariant) -> Annotated[_DObje= ct]: - obj: _DObject =3D { + def _gen_variant(self, variant: QAPISchemaVariant + ) -> Annotated[SchemaInfoObjectVariant]: + obj: SchemaInfoObjectVariant =3D { 'case': variant.name, 'type': self._use_type(variant.type) } @@ -298,11 +310,12 @@ def visit_object_type_flat(self, name: str, info: Opt= ional[QAPISourceInfo], features: List[QAPISchemaFeature], members: List[QAPISchemaObjectTypeMember], variants: Optional[QAPISchemaVariants]) -> = None: - obj: _DObject =3D {'members': [self._gen_member(m) for m in member= s]} + obj: SchemaInfoObject =3D { + 'members': [self._gen_member(m) for m in members] + } if variants: - obj.update(self._gen_variants(variants.tag_member.name, - variants.variants)) - + obj['tag'] =3D variants.tag_member.name + obj['variants'] =3D [self._gen_variant(v) for v in variants.va= riants] self._gen_tree(name, 'object', obj, ifcond, features) =20 def visit_alternate_type(self, name: str, info: Optional[QAPISourceInf= o], @@ -327,7 +340,7 @@ def visit_command(self, name: str, info: Optional[QAPIS= ourceInfo], =20 arg_type =3D arg_type or self._schema.the_empty_object_type ret_type =3D ret_type or self._schema.the_empty_object_type - obj: _DObject =3D { + obj: SchemaInfoCommand =3D { 'arg-type': self._use_type(arg_type), 'ret-type': self._use_type(ret_type) } --=20 2.29.2