def _format_status(session: 'CheckCalibrationSession',
router: UrlDispatcher) -> 'CalibrationSessionStatus':
pips = session.pipettes
# pydantic restricts dictionary keys that can be evaluated. Since
# the session pipettes dictionary has a UUID as a key, we must first
# convert the UUID to a hex string.
instruments = {token.hex: data for token, data in pips.items() if token}
current = session.state_machine.current_state.name
next = session.state_machine.next_state
if next:
path = router.get(next.name, '')
if path:
url = path.url_for()
else:
url = path
links = {'links': {next.name: url}}
else:
links = {'links': {}}
status = CalibrationSessionStatus(instruments=instruments,
currentStep=current,
nextSteps=links)
return status
