Onionr/src/blockcreatorqueue/__init__.py

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"""Onionr - Private P2P Communication.
BlockCreatorQueue, generate anonvdf blocks in a queue
"""
from typing import Callable
from threading import Thread
from hashlib import sha3_224
from os import cpu_count
import time
import blockio
"""
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
class AlreadyGenerating(Exception): pass # noqa
class BlockCreatorQueue:
def __init__(
self, callback_func: Callable, *additional_callback_func_args,
**additional_callback_func_kwargs):
self.callback_func = callback_func
self.queued = set()
self.max_parallel = cpu_count()
self.additional_callback_func_args = additional_callback_func_args
self.additional_callback_func_kwargs = additional_callback_func_kwargs
def block_data_in_queue(self, block_data: bytes) -> bool:
if sha3_224(block_data).digest() in self.queued:
return True
return False
def queue_block(
self, block_data, block_type, ttl: int, **block_metadata) -> bytes:
"""Spawn a thread to make a subprocess to generate a block
if queue is not full, else wait"""
digest = sha3_224(block_data).digest()
def _do_create():
if digest in self.queued:
raise AlreadyGenerating()
self.queued.add(digest)
while len(self.queued) >= self.max_parallel:
time.sleep(1)
result = blockio.subprocgenerate.vdf_block(
block_data, block_type, ttl, **block_metadata)
self.queued.remove(digest)
self.callback_func(
result,
*self.additional_callback_func_args,
**self.additional_callback_func_kwargs)
Thread(target=_do_create, daemon=True).start()
return digest