Fix another jsonschema typecheck error (#11830)

Similar to #11817.

In `_create_power_level_validator` we
- retrieve `validator`. This is a class implementing the
  `jsonschema.protocols.Validator` interface. In other words,
  `validator: Type[jsonschema.protocols.Validator]`.
- we then create an second validator class by modifying the original
  `validator`. We return that class, which is also of type
  `Type[jsonschema.protocols.Validator]`.

So the original annotation was incorrect: it claimed we were returning
an instance of jsonSchema.Draft7Validator, not the class (or a subclass)
itself. (Strictly speaking this is incorrect, because `POWER_LEVELS_SCHEMA`
isn't pinned to a particular version of JSON Schema. But there are other
complications with the type stubs if you try to fix this; I felt like
the change herein was a decent compromise that better expresses intent).

(I suspect/hope the typeshed project would welcome an effort to improve
the jsonschema stubs. Let's see if I get some spare time.)
This commit is contained in:
David Robertson 2022-01-25 20:29:28 +00:00 committed by GitHub
parent b8bf600700
commit 74e4419eb4
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3 changed files with 4 additions and 5 deletions

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@ -1 +1 @@
Compatibility with updated type hints for jsonschema 4.4.0.
Correct a type annotation in the event validation logic.

1
changelog.d/11830.misc Normal file
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@ -0,0 +1 @@
Correct a type annotation in the event validation logic.

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@ -12,7 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import collections.abc
from typing import Iterable, Union
from typing import Iterable, Type, Union
import jsonschema
@ -246,9 +246,7 @@ POWER_LEVELS_SCHEMA = {
# This could return something newer than Draft 7, but that's the current "latest"
# validator.
#
# See https://github.com/python/typeshed/issues/7028 for the ignored return type.
def _create_power_level_validator() -> jsonschema.Draft7Validator: # type: ignore[valid-type]
def _create_power_level_validator() -> Type[jsonschema.Draft7Validator]:
validator = jsonschema.validators.validator_for(POWER_LEVELS_SCHEMA)
# by default jsonschema does not consider a frozendict to be an object so