def _deposit_inflight(
self, beneficiary: Address, total_deposit: TokenAmount
) -> Iterator[None]:
""" Updates the `_inflight_deposits` dictionary to handle concurrent deposits.
Note: This must be called after `_deposit_preconditions`.
"""
async_result = AsyncResult()
current_inflight = InflightDeposit(total_deposit, async_result)
self._inflight_deposits[beneficiary] = current_inflight
try:
yield
except Exception as e:
async_result.set_exception(e)
raise
else:
async_result.set_result(None)
finally:
# Clearing the dictionary is not strictly necessary since the
# deposit is always increasing. But it is just nice to clear up the
# container.
#
# When two transactions are in the flight, only the one for the
# highest `total_deposit` should clear the container.
stored_inflight = self._inflight_deposits.get(beneficiary)
if stored_inflight == current_inflight:
del self._inflight_deposits[beneficiary]
