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printblockdb.py
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#!/usr/bin/python
import leveldb
import binascii
import socket
import struct
import io
import sys
import os
import hashlib
from collections import defaultdict
from operator import attrgetter
def uint32(x):
return x & 0xffffffffL
def bytereverse(x):
return uint32(( ((x) << 24) | (((x) << 8) & 0x00ff0000) |
(((x) >> 8) & 0x0000ff00) | ((x) >> 24) ))
def bufreverse(in_buf):
out_words = []
for i in range(0, len(in_buf), 4):
word = struct.unpack('@I', in_buf[i:i+4])[0]
out_words.append(struct.pack('@I', bytereverse(word)))
return ''.join(out_words)
def wordreverse(in_buf):
out_words = []
for i in range(0, len(in_buf), 4):
out_words.append(in_buf[i:i+4])
out_words.reverse()
return ''.join(out_words)
def calc_hdr_hash(blk_hdr):
hash1 = hashlib.sha256()
hash1.update(blk_hdr)
hash1_o = hash1.digest()
hash2 = hashlib.sha256()
hash2.update(hash1_o)
hash2_o = hash2.digest()
return hash2_o
def calc_hash_str(blk_hdr):
hash = calc_hdr_hash(blk_hdr)
hash = bufreverse(hash)
hash = wordreverse(hash)
hash_str = hash.encode('hex')
return hash_str
def deser_b128varint(f):
n = 0
while True:
ch = struct.unpack("<b", f.read(1))[0]
n = (n << 7) | (ch & 0x7f)
if (ch & 0x80):
n = n + 1
else:
return n
def deser_uint256(f):
r = 0L
for i in xrange(8):
t = struct.unpack("<I", f.read(4))[0]
r += t << (i * 32)
return r
class CDiskBlockIndex(object):
def __init__(self):
self.nVersion = 0
self.nHeight = 0
self.nStatus = 0
self.nTx = 0
self.nFile = 0
self.nDataPos = 0
self.nUndoPos = 0
def deserialize(self,f):
self.nVersion = deser_b128varint(f)
self.nHeight = deser_b128varint(f)
self.nStatus = deser_b128varint(f)
self.nTx = deser_b128varint(f)
self.nFile = deser_b128varint(f)
self.nDataPos = deser_b128varint(f)
self.nUndoPos = deser_b128varint(f)
def __repr__(self):
return "CDiskBlockIndex(nVersion=%d nHeight=%d nStatus=%d nTx=%d nFile=%d nDataPos=%d nUndoPos=%d)" % (self.nVersion, self.nHeight, self.nStatus, self.nTx, self.nFile, self.nDataPos, self.nUndoPos)
class CBlockFileInfo(object):
def __init__(self):
self.nBlocks = 0
self.nSize = 0
self.nUndoSize = 0
self.nHeightFirst = 0
self.nHeightLast = 0
self.nTimeFirst = 0
self.nTimeLast = 0
def deserialize(self, f):
self.nBlocks = deser_b128varint(f)
self.nSize = deser_b128varint(f)
self.nUndoSize = deser_b128varint(f)
self.nHeightFirst = deser_b128varint(f)
self.nHeightLast = deser_b128varint(f)
self.nTimeFirst = deser_b128varint(f)
self.nTimeLast = deser_b128varint(f)
def __repr__(self):
return "CBlockFileInfo(nBlocks = %d nSize=%d nUndoSize=%d nHeightFirst=%d nHeightLast=%d nTimeFirst=%d nTimeLast=%d)" % (self.nBlocks, self.nSize, self.nUndoSize, self.nHeightFirst, self.nHeightLast, self.nTimeFirst, self.nTimeLast)
def check_size(fname, given_size):
disk_size = os.stat(fname).st_size
if (disk_size != given_size):
print("[error] %s: db/disk size mismatch disk=%d db=%d diff=%d" % (fname, disk_size, given_size, disk_size-given_size))
return False
return True
if len(sys.argv) != 2:
print("Usage: %s datadir" % sys.argv[0])
exit(-1)
settings = {}
settings['netmagic'] = 'f9beb4d9'.decode('hex')
settings['hashlist'] = 'hashes.txt'
MAX_BLOCK_SIZE = 1024*1024
datadir = sys.argv[1]
dbname = datadir + '/blocks/index'
db = leveldb.LevelDB(dbname)
print('Loading block database')
per_file = defaultdict(list)
count = 0
for k,v in db.RangeIter():
if k[0] == 'b':
st = io.BytesIO(k[1:])
x = deser_uint256(st)
stv = io.BytesIO(v)
cdbi = CDiskBlockIndex()
cdbi.deserialize(stv)
#print(cdbi)
#print('%3i %08x %064x' % (cdbi.nFile, cdbi.nDataPos, x))
if cdbi.nDataPos != 0:
cdbi.hash_str = '%064x' % (x)
per_file[cdbi.nFile].append(cdbi)
count += 1
#if count > 100:
# break
# sort blocks per file by position
for fnum,blocks in per_file.iteritems():
blocks.sort(key=attrgetter('nDataPos'))
filenums = sorted(per_file.keys())
for fnum in filenums:
blocks = per_file[fnum]
print('Checking file %i' % fnum)
bfn = datadir + '/blocks/blk%05d.dat' % fnum
prev_begin = None
prev_end = None
with open(bfn, 'rb') as f:
for cdbi in blocks:
f.seek(cdbi.nDataPos - 8)
inhdr = f.read(8)
inLen = struct.unpack("<I", inhdr[4:])[0]
if inhdr[:4] != settings['netmagic'] or inLen > MAX_BLOCK_SIZE:
print('%3i %08x Invalid block' % (cdbi.nFile, cdbi.nDataPos))
exit(1)
(span_begin, span_end) = (cdbi.nDataPos - 8, cdbi.nDataPos + inLen)
if prev_end is not None:
if span_begin < prev_end:
print('%3i %08x Overlapping block %08x-%08x,%08x-%08x' % (cdbi.nFile, cdbi.nDataPos, span_begin, span_end, prev_begin, prev_end))
elif span_begin != prev_end:
print('%3i %08x Gap between blocks %08x-%08x,%08x-%08x' % (cdbi.nFile, cdbi.nDataPos, span_begin, span_end, prev_begin, prev_end))
blk_hdr = f.read(80)
hash_str = calc_hash_str(blk_hdr)
if hash_str != cdbi.hash_str:
print('%3i %08x %s != %s' % (cdbi.nFile, cdbi.nDataPos, hash_str, cdbi.hash_str))
prev_begin = span_begin
prev_end = span_end
'''
for k,v in db.RangeIter():
if k[0] == 'f':
blknum = struct.unpack('<i',k[1:5])[0]
st = io.BytesIO(v)
cbfi = CBlockFileInfo()
cbfi.deserialize(st)
print("Block file %d: %s" % (blknum, cbfi))
bfn = datadir + '/blocks/blk%05d.dat' % blknum
rfn = datadir + '/blocks/rev%05d.dat' % blknum
check_size(bfn, cbfi.nSize)
check_size(rfn, cbfi.nUndoSize)
# print(cbfi)
'''