block-a-doodle-chain - scan dash core bdb files for P2PK graffiti

tagchain-list.py

#!/usr/bin/env python

# tagchain-list - scan dash core bdb files for P2PK graffiti

from __future__ import print_function

import re
import os
from collections import OrderedDict
from itertools import izip, repeat

# only show entries longer than
MINLEN = 6

# only scan recent n block files
LASTBLOCKS = 2

# location of blockfiles to scan
blockdir = '/home/ubuntu/.dashcore/blocks/'

# voodoo, prepare a blood sacrifice
pat = re.compile(r'\x19\x76\xa9\x14([\x20-\x7f]+)\x00*\x88')

# how much mega would a mega byte bite if a mega byte could bite wood?
MB = 1024 * 1024


if __name__ == '__main__':

    blockpaths = sorted(
        [blockdir + fn for fn in os.listdir(blockdir) if fn.startswith('blk')])[-LASTBLOCKS:]

    m = []
    for blockfile in blockpaths:
        print("scanning %s" % blockfile)
        with open(blockfile, 'rb') as f:
            megs = b''
            while True:
                meg = f.read(MB)
                if not meg:
                    break
                megs += meg
                m.extend(pat.findall(megs))
                megs = megs[-(MB / 2):]

    matches = list(
        OrderedDict(izip([n for n in m if len(n) > MINLEN], repeat(None))))

    print()
    for match in list(matches):
        print(match)