templates.random_sources.process_source module

Object that provides randomness from processes.

class templates.random_sources.process_source.FakeList(items=(None,))[source]

Bases: List[Any]

List that completely discards anything you may want to add.

extend(values)[source]

Extend list by appending elements from the iterable.

Return type:

None

class templates.random_sources.process_source.ProcessSource(generation_function, amount=0, max_workers=None, debug=False)[source]

Bases: RandomnessSource[RR]

Object for providing randomness from processes that repeatedly execute a randomness generating function.

Implements tno.mpc.encryption_schemes.templates._randomness_manager.RandomnessSource.

__init__(generation_function, amount=0, max_workers=None, debug=False)[source]

Object that starts processes to generate and yield random values.

This construction starts generation workers that generate new randomness using the given generation function. This happens in separate processes to avoid blocking and speed up the generation.

Parameters:

  • generation_function (Callable[[], TypeVar(RR)]) – Unbound callable object (e.g. function or static method) that generates one random value.

  • amount (int) – Upper bound on the total amount of randomizations to generate.

  • max_workers (Optional[int]) – Number of workers that generate randomizations in parallel. Should be at least 1. If None, the number of workers equals the number of CPUs on the device.

  • debug (bool) – Flag to determine whether debug information should be displayed.

close()[source]

Shuts down all processes.

Return type:

None

get_one()[source]

Get one random value.

Raises:

  • PauseIteration – All requested randomness was already yielded.

  • ValueError – No pool of processes instantiated.

Return type:

TypeVar(RR)

Returns:

Single random value.

increase_requested(amount)[source]

Increase the amount of randomness to be generated by the process pool.

Parameters:

amount (int) – Amount to be generated additionally.

Return type:

None

property nr_requested: int

Number of random elements requested.

Returns:

Number of random elements requested.

property nr_yielded: int

Number of random elements yielded.

Returns:

Number of random elements yielded.

open()[source]

Instantiate a pool for processes and set them to work.

Return type:

None

property pool: ProcessPoolExecutor

Get the pool of the ProcessSource.

Raises:

ValueError – No pool has yet been initialized.

Returns:

Pool of the current object.