mine_0x00000000_selector.py

from eth_utils import function_signature_to_4byte_selector
import itertools
import multiprocessing
import random
import time


TARGET = b'\x00' * 4


def check_signature(idx, target):
    fn_sig = "get_block_hash_{0}(uint256)".format(idx)
    fn_selector = function_signature_to_4byte_selector(fn_sig)
    if fn_selector == target:
        print('FOUND:', fn_sig)
        return fn_sig


def report_success(fn_sig):
    if fn_sig:
        print('FOUND:', fn_sig)


def find(target=TARGET):
    pool = multiprocessing.Pool(8)
    pending_results = []
    counter = itertools.count(1)
    start_at = time.time()
    try:
        while True:
            while len(pending_results) < 256:
                idx = random.randint(0, 1000000000000000)
                num_processed = next(counter)
                if num_processed % 100000 == 0:
                    print(
                        'processed:',
                        num_processed,
                        'iterations-per-second:',
                        num_processed / (time.time() - start_at),
                    )
                pending_results.append(pool.apply_async(
                    check_signature,
                    args=(idx, target),
                    callback=report_success,
                ))
            pending_results = [result for result in pending_results if not result.ready()]

    except KeyboardInterrupt:
        pool.close()
        pool.join()
        pool.terminate()
        num_processed = next(counter)
        print("=====================================================")
        print("PROCESSED:", num_processed)
        print('ITERATIONS-PER-SECOND', num_processed / (time.time() - start_at))
        print("=====================================================")


if __name__ == "__main__":
    find()