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Break into two steps: * Generate hash list * Build data file(s) from local bitcoind blocks/ directory. This supports building one large bootstrap.dat, or multiple smaller blocks/blkNNNNN.dat files.try
Jeff Garzik
11 years ago
4 changed files with 226 additions and 39 deletions
@ -1,2 +1,29 @@ |
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### Linearize ### |
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Construct a linear, no-fork, best version of the blockchain. |
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# Linearize |
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Construct a linear, no-fork, best version of the blockchain. |
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## Step 1: Download hash list |
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$ ./linearize-hashes.py linearize.cfg > hashlist.txt |
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Required configuration file settings for linearize-hashes: |
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* RPC: rpcuser, rpcpassword |
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Optional config file setting for linearize-hashes: |
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* RPC: host, port |
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* Block chain: min_height, max_height |
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## Step 2: Copy local block data |
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$ ./linearize-data.py linearize.cfg |
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Required configuration file settings: |
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* "input": bitcoind blocks/ directory containing blkNNNNN.dat |
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* "hashlist": text file containing list of block hashes, linearized-hashes.py |
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output. |
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* "output_file": bootstrap.dat |
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or |
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* "output": output directory for linearized blocks/blkNNNNN.dat output |
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Optional config file setting for linearize-data: |
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* "netmagic": network magic number |
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@ -1,12 +1,16 @@ |
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# bitcoind RPC settings |
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# bitcoind RPC settings (linearize-hashes) |
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rpcuser=someuser |
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rpcpassword=somepassword |
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host=127.0.0.1 |
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port=8332 |
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# bootstrap.dat settings |
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# bootstrap.dat hashlist settings (linearize-hashes) |
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max_height=313000 |
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# bootstrap.dat input/output settings (linearize-data) |
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netmagic=f9beb4d9 |
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max_height=279000 |
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output=bootstrap.dat |
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input=/home/example/.bitcoin/blocks |
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output_file=/home/example/Downloads/bootstrap.dat |
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hashlist=hashlist.txt |
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@ -0,0 +1,182 @@ |
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#!/usr/bin/python |
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# |
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# linearize-data.py: Construct a linear, no-fork version of the chain. |
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# |
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# Copyright (c) 2013 The Bitcoin developers |
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# Distributed under the MIT/X11 software license, see the accompanying |
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# file COPYING or http://www.opensource.org/licenses/mit-license.php. |
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# |
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import json |
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import struct |
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import re |
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import base64 |
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import httplib |
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import sys |
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import hashlib |
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MAX_OUT_SZ = 128 * 1024 * 1024 |
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settings = {} |
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def uint32(x): |
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return x & 0xffffffffL |
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def bytereverse(x): |
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return uint32(( ((x) << 24) | (((x) << 8) & 0x00ff0000) | |
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(((x) >> 8) & 0x0000ff00) | ((x) >> 24) )) |
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def bufreverse(in_buf): |
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out_words = [] |
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for i in range(0, len(in_buf), 4): |
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word = struct.unpack('@I', in_buf[i:i+4])[0] |
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out_words.append(struct.pack('@I', bytereverse(word))) |
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return ''.join(out_words) |
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def wordreverse(in_buf): |
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out_words = [] |
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for i in range(0, len(in_buf), 4): |
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out_words.append(in_buf[i:i+4]) |
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out_words.reverse() |
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return ''.join(out_words) |
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def calc_hdr_hash(rawblock): |
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blk_hdr = rawblock[:80] |
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hash1 = hashlib.sha256() |
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hash1.update(blk_hdr) |
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hash1_o = hash1.digest() |
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hash2 = hashlib.sha256() |
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hash2.update(hash1_o) |
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hash2_o = hash2.digest() |
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return hash2_o |
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def calc_hash_str(rawblock): |
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hash = calc_hdr_hash(rawblock) |
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hash = bufreverse(hash) |
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hash = wordreverse(hash) |
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hash_str = hash.encode('hex') |
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return hash_str |
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def get_block_hashes(settings): |
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blkindex = [] |
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f = open(settings['hashlist'], "r") |
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for line in f: |
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line = line.rstrip() |
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blkindex.append(line) |
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print("Read " + str(len(blkindex)) + " hashes") |
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return blkindex |
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def mkblockset(blkindex): |
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blkmap = {} |
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for hash in blkindex: |
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blkmap[hash] = True |
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return blkmap |
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def copydata(settings, blkindex, blkset): |
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inFn = 0 |
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inF = None |
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outFn = 0 |
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outsz = 0 |
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outF = None |
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blkCount = 0 |
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fileOutput = True |
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if 'output' in settings: |
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fileOutput = False |
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while True: |
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if not inF: |
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fname = "%s/blk%05d.dat" % (settings['input'], inFn) |
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print("Input file" + fname) |
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inF = open(fname, "rb") |
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inhdr = inF.read(8) |
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if (not inhdr or (inhdr[0] == "\0")): |
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inF.close() |
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inF = None |
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inFn = inFn + 1 |
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continue |
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inMagic = inhdr[:4] |
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if (inMagic != settings['netmagic']): |
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print("Invalid magic:" + inMagic) |
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return |
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inLenLE = inhdr[4:] |
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su = struct.unpack("<I", inLenLE) |
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inLen = su[0] |
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rawblock = inF.read(inLen) |
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hash_str = calc_hash_str(rawblock) |
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if not hash_str in blkset: |
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print("Skipping unknown block " + hash_str) |
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continue |
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if not fileOutput and ((outsz + inLen) > MAX_OUT_SZ): |
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outF.close() |
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outF = None |
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outFn = outFn + 1 |
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outsz = 0 |
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if not outF: |
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if fileOutput: |
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fname = settings['output_file'] |
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else: |
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fname = "%s/blk%05d.dat" % (settings['output'], outFn) |
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print("Output file" + fname) |
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outF = open(fname, "wb") |
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outF.write(inhdr) |
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outF.write(rawblock) |
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outsz = outsz + inLen + 8 |
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blkCount = blkCount + 1 |
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if (blkCount % 1000) == 0: |
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print("Wrote " + str(blkCount) + " blocks") |
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if __name__ == '__main__': |
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if len(sys.argv) != 2: |
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print "Usage: linearize-data.py CONFIG-FILE" |
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sys.exit(1) |
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f = open(sys.argv[1]) |
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for line in f: |
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# skip comment lines |
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m = re.search('^\s*#', line) |
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if m: |
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continue |
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# parse key=value lines |
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m = re.search('^(\w+)\s*=\s*(\S.*)$', line) |
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if m is None: |
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continue |
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settings[m.group(1)] = m.group(2) |
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f.close() |
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if 'netmagic' not in settings: |
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settings['netmagic'] = 'f9beb4d9' |
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if 'input' not in settings: |
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settings['input'] = 'input' |
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if 'hashlist' not in settings: |
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settings['hashlist'] = 'hashlist.txt' |
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settings['netmagic'] = settings['netmagic'].decode('hex') |
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if 'output_file' not in settings and 'output' not in settings: |
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print("Missing output file / directory") |
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sys.exit(1) |
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blkindex = get_block_hashes(settings) |
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blkset = mkblockset(blkindex) |
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if not "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f" in blkset: |
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print("not found") |
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else: |
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copydata(settings, blkindex, blkset) |
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