#!/usr/bin/env python # # linearize-data.py: Construct a linear, no-fork version of the chain. # # Copyright (c) 2013-2016 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. # from __future__ import print_function, division import json import struct import re import os import os.path import base64 import httplib import sys import hashlib import datetime import time from collections import namedtuple settings = {} 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 get_blk_dt(blk_hdr): members = struct.unpack("<I", blk_hdr[68:68+4]) nTime = members[0] dt = datetime.datetime.fromtimestamp(nTime) dt_ym = datetime.datetime(dt.year, dt.month, 1) return (dt_ym, nTime) def get_block_hashes(settings): blkindex = [] f = open(settings['hashlist'], "r") for line in f: line = line.rstrip() blkindex.append(line) print("Read " + str(len(blkindex)) + " hashes") return blkindex def mkblockmap(blkindex): blkmap = {} for height,hash in enumerate(blkindex): blkmap[hash] = height return blkmap # Block header and extent on disk BlockExtent = namedtuple('BlockExtent', ['fn', 'offset', 'inhdr', 'blkhdr', 'size']) class BlockDataCopier: def __init__(self, settings, blkindex, blkmap): self.settings = settings self.blkindex = blkindex self.blkmap = blkmap self.inFn = 0 self.inF = None self.outFn = 0 self.outsz = 0 self.outF = None self.outFname = None self.blkCountIn = 0 self.blkCountOut = 0 self.lastDate = datetime.datetime(2000, 1, 1) self.highTS = 1408893517 - 315360000 self.timestampSplit = False self.fileOutput = True self.setFileTime = False self.maxOutSz = settings['max_out_sz'] if 'output' in settings: self.fileOutput = False if settings['file_timestamp'] != 0: self.setFileTime = True if settings['split_timestamp'] != 0: self.timestampSplit = True # Extents and cache for out-of-order blocks self.blockExtents = {} self.outOfOrderData = {} self.outOfOrderSize = 0 # running total size for items in outOfOrderData def writeBlock(self, inhdr, blk_hdr, rawblock): blockSizeOnDisk = len(inhdr) + len(blk_hdr) + len(rawblock) if not self.fileOutput and ((self.outsz + blockSizeOnDisk) > self.maxOutSz): self.outF.close() if self.setFileTime: os.utime(outFname, (int(time.time()), highTS)) self.outF = None self.outFname = None self.outFn = self.outFn + 1 self.outsz = 0 (blkDate, blkTS) = get_blk_dt(blk_hdr) if self.timestampSplit and (blkDate > self.lastDate): print("New month " + blkDate.strftime("%Y-%m") + " @ " + hash_str) lastDate = blkDate if outF: outF.close() if setFileTime: os.utime(outFname, (int(time.time()), highTS)) self.outF = None self.outFname = None self.outFn = self.outFn + 1 self.outsz = 0 if not self.outF: if self.fileOutput: outFname = self.settings['output_file'] else: outFname = os.path.join(self.settings['output'], "blk%05d.dat" % self.outFn) print("Output file " + outFname) self.outF = open(outFname, "wb") self.outF.write(inhdr) self.outF.write(blk_hdr) self.outF.write(rawblock) self.outsz = self.outsz + len(inhdr) + len(blk_hdr) + len(rawblock) self.blkCountOut = self.blkCountOut + 1 if blkTS > self.highTS: self.highTS = blkTS if (self.blkCountOut % 1000) == 0: print('%i blocks scanned, %i blocks written (of %i, %.1f%% complete)' % (self.blkCountIn, self.blkCountOut, len(self.blkindex), 100.0 * self.blkCountOut / len(self.blkindex))) def inFileName(self, fn): return os.path.join(self.settings['input'], "blk%05d.dat" % fn) def fetchBlock(self, extent): '''Fetch block contents from disk given extents''' with open(self.inFileName(extent.fn), "rb") as f: f.seek(extent.offset) return f.read(extent.size) def copyOneBlock(self): '''Find the next block to be written in the input, and copy it to the output.''' extent = self.blockExtents.pop(self.blkCountOut) if self.blkCountOut in self.outOfOrderData: # If the data is cached, use it from memory and remove from the cache rawblock = self.outOfOrderData.pop(self.blkCountOut) self.outOfOrderSize -= len(rawblock) else: # Otherwise look up data on disk rawblock = self.fetchBlock(extent) self.writeBlock(extent.inhdr, extent.blkhdr, rawblock) def run(self): while self.blkCountOut < len(self.blkindex): if not self.inF: fname = self.inFileName(self.inFn) print("Input file " + fname) try: self.inF = open(fname, "rb") except IOError: print("Premature end of block data") return inhdr = self.inF.read(8) if (not inhdr or (inhdr[0] == "\0")): self.inF.close() self.inF = None self.inFn = self.inFn + 1 continue inMagic = inhdr[:4] if (inMagic != self.settings['netmagic']): print("Invalid magic: " + inMagic.encode('hex')) return inLenLE = inhdr[4:] su = struct.unpack("<I", inLenLE) inLen = su[0] - 80 # length without header blk_hdr = self.inF.read(80) inExtent = BlockExtent(self.inFn, self.inF.tell(), inhdr, blk_hdr, inLen) hash_str = calc_hash_str(blk_hdr) if not hash_str in blkmap: print("Skipping unknown block " + hash_str) self.inF.seek(inLen, os.SEEK_CUR) continue blkHeight = self.blkmap[hash_str] self.blkCountIn += 1 if self.blkCountOut == blkHeight: # If in-order block, just copy rawblock = self.inF.read(inLen) self.writeBlock(inhdr, blk_hdr, rawblock) # See if we can catch up to prior out-of-order blocks while self.blkCountOut in self.blockExtents: self.copyOneBlock() else: # If out-of-order, skip over block data for now self.blockExtents[blkHeight] = inExtent if self.outOfOrderSize < self.settings['out_of_order_cache_sz']: # If there is space in the cache, read the data # Reading the data in file sequence instead of seeking and fetching it later is preferred, # but we don't want to fill up memory self.outOfOrderData[blkHeight] = self.inF.read(inLen) self.outOfOrderSize += inLen else: # If no space in cache, seek forward self.inF.seek(inLen, os.SEEK_CUR) print("Done (%i blocks written)" % (self.blkCountOut)) if __name__ == '__main__': if len(sys.argv) != 2: print("Usage: linearize-data.py CONFIG-FILE") sys.exit(1) f = open(sys.argv[1]) for line in f: # skip comment lines m = re.search('^\s*#', line) if m: continue # parse key=value lines m = re.search('^(\w+)\s*=\s*(\S.*)$', line) if m is None: continue settings[m.group(1)] = m.group(2) f.close() if 'netmagic' not in settings: settings['netmagic'] = 'f9beb4d9' if 'genesis' not in settings: settings['genesis'] = '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f' if 'input' not in settings: settings['input'] = 'input' if 'hashlist' not in settings: settings['hashlist'] = 'hashlist.txt' if 'file_timestamp' not in settings: settings['file_timestamp'] = 0 if 'split_timestamp' not in settings: settings['split_timestamp'] = 0 if 'max_out_sz' not in settings: settings['max_out_sz'] = 1000L * 1000 * 1000 if 'out_of_order_cache_sz' not in settings: settings['out_of_order_cache_sz'] = 100 * 1000 * 1000 settings['max_out_sz'] = long(settings['max_out_sz']) settings['split_timestamp'] = int(settings['split_timestamp']) settings['file_timestamp'] = int(settings['file_timestamp']) settings['netmagic'] = settings['netmagic'].decode('hex') settings['out_of_order_cache_sz'] = int(settings['out_of_order_cache_sz']) if 'output_file' not in settings and 'output' not in settings: print("Missing output file / directory") sys.exit(1) blkindex = get_block_hashes(settings) blkmap = mkblockmap(blkindex) if not settings['genesis'] in blkmap: print("Genesis block not found in hashlist") else: BlockDataCopier(settings, blkindex, blkmap).run()