class Aws::EndpointCache

def extract_key(ctx)
  parts = []
  # fetching from cred provider directly gives warnings
  parts << ctx.config.credentials.credentials.access_key_id
  if _endpoint_operation_identifier(ctx)
    parts << ctx.operation_name
    ctx.operation.input.shape.members.inject(parts) do |p, (name, ref)|
      p << ctx.params[name] if ref['endpointdiscoveryid']
      p
    end
  end
  parts.join('_')
end