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authorDavid Robertson <davidr@element.io>2022-01-25 20:29:28 +0000
committerGitHub <noreply@github.com>2022-01-25 15:29:28 -0500
commit74e4419eb4b18ef7d2a3b4416290a4f103042436 (patch)
tree69c752a13e0f2feef22b3dfefc77185fd24bd1ac /synapse/app/generic_worker.py
parentCheck that `gc` method is available before using in `synapse/app/_base` (#11... (diff)
downloadsynapse-74e4419eb4b18ef7d2a3b4416290a4f103042436.tar.xz
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.)
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