def prevent_float_value()

in kinto-remote-settings/src/kinto_remote_settings/signer/listeners.py [0:0]

• 25 lines of code
• 10 McCabe index (conditional complexity)

def prevent_float_value(event, resources):
    """This ResourceChanged event listener will reject records that
    contain float values.

    In order to be able to align our Canonical JSON implementation with
    the most elaborated specification [0], we must forbid floats to be
    introduced in the system.

    This is indeed the only area where our implementation differs, and
    instead of supporting complex migration paths, getting rid of floats
    is the simplest approach. Floats can be published as strings if needed.

    [0] https://github.com/gibson042/canonicaljson-spec
    """

    def scan(d, path=""):
        if isinstance(d, list):
            d = {i: o for i, o in enumerate(d)}
        for k, v in d.items():
            path = f"{path}.{k}" if path else k
            if isinstance(v, float):
                raise ValueError(
                    f"field contains float value (tip: use integer or string), '{path}'"
                )
            if isinstance(v, (list, dict)):
                scan(v, path)

    # Only raise in configured resources.
    resource, _ = pick_resource_and_signer(
        event.request,
        resources,
        bucket_id=event.payload["bucket_id"],
        collection_id=event.payload["collection_id"],
    )
    if resource is None:
        return

    # Check each created/updated record in the batch.
    for impacted in event.impacted_objects:
        try:
            scan(impacted["new"])
        except ValueError as e:
            raise_invalid(message=str(e))