from threading import RLock

from cryptography.hazmat.primitives.asymmetric import ec

from aucoin import dsa
from aucoin.block import Block


def mine(block: Block, private_key: ec.EllipticCurvePrivateKey):
    while True:
        block.signature = dsa.sign(private_key, block.truncated_header)

        if block.hash <= block.target:
            break

    return block


class Core(object):
    def __init__(self):
        self.lock = RLock()