src/python/grpcio/grpc/_adapter/_implementations.py

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import collections

from grpc.beta import interfaces

class AuthMetadataContext(collections.namedtuple(
    'AuthMetadataContext', [
        'service_url',
        'method_name'
    ]), interfaces.GRPCAuthMetadataContext):
  pass


class AuthMetadataPluginCallback(interfaces.GRPCAuthMetadataContext):

  def __init__(self, callback):
    self._callback = callback

  def __call__(self, metadata, error):
    self._callback(metadata, error)