contrib/linearize/linearize-hashes.py

   1 #!/usr/bin/env python3
   2 #
   3 # linearize-hashes.py:  List blocks in a linear, no-fork version of the chain.
   4 #
   5 # Copyright (c) 2013-2016 The Bitcoin Core developers
   6 # Distributed under the MIT software license, see the accompanying
   7 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   8 #
   9
  10 from __future__ import print_function
  11 try: # Python 3
  12     import http.client as httplib
  13 except ImportError: # Python 2
  14     import httplib
  15 import json
  16 import re
  17 import base64
  18 import sys
  19 import os
  20 import os.path
  21
  22 settings = {}
  23
  24 ##### Switch endian-ness #####
  25 def hex_switchEndian(s):
  26         """ Switches the endianness of a hex string (in pairs of hex chars) """
  27         pairList = [s[i:i+2].encode() for i in range(0, len(s), 2)]
  28         return b''.join(pairList[::-1]).decode()
  29
  30 class BitcoinRPC:
  31         def __init__(self, host, port, username, password):
  32                 authpair = "%s:%s" % (username, password)
  33                 authpair = authpair.encode('utf-8')
  34                 self.authhdr = b"Basic " + base64.b64encode(authpair)
  35                 self.conn = httplib.HTTPConnection(host, port=port, timeout=30)
  36
  37         def execute(self, obj):
  38                 try:
  39                         self.conn.request('POST', '/', json.dumps(obj),
  40                                 { 'Authorization' : self.authhdr,
  41                                   'Content-type' : 'application/json' })
  42                 except ConnectionRefusedError:
  43                         print('RPC connection refused. Check RPC settings and the server status.',
  44                               file=sys.stderr)
  45                         return None
  46
  47                 resp = self.conn.getresponse()
  48                 if resp is None:
  49                         print("JSON-RPC: no response", file=sys.stderr)
  50                         return None
  51
  52                 body = resp.read().decode('utf-8')
  53                 resp_obj = json.loads(body)
  54                 return resp_obj
  55
  56         @staticmethod
  57         def build_request(idx, method, params):
  58                 obj = { 'version' : '1.1',
  59                         'method' : method,
  60                         'id' : idx }
  61                 if params is None:
  62                         obj['params'] = []
  63                 else:
  64                         obj['params'] = params
  65                 return obj
  66
  67         @staticmethod
  68         def response_is_error(resp_obj):
  69                 return 'error' in resp_obj and resp_obj['error'] is not None
  70
  71 def get_block_hashes(settings, max_blocks_per_call=10000):
  72         rpc = BitcoinRPC(settings['host'], settings['port'],
  73                          settings['rpcuser'], settings['rpcpassword'])
  74
  75         height = settings['min_height']
  76         while height < settings['max_height']+1:
  77                 num_blocks = min(settings['max_height']+1-height, max_blocks_per_call)
  78                 batch = []
  79                 for x in range(num_blocks):
  80                         batch.append(rpc.build_request(x, 'getblockhash', [height + x]))
  81
  82                 reply = rpc.execute(batch)
  83                 if reply is None:
  84                         print('Cannot continue. Program will halt.')
  85                         return None
  86
  87                 for x,resp_obj in enumerate(reply):
  88                         if rpc.response_is_error(resp_obj):
  89                                 print('JSON-RPC: error at height', height+x, ': ', resp_obj['error'], file=sys.stderr)
  90                                 exit(1)
  91                         assert(resp_obj['id'] == x) # assume replies are in-sequence
  92                         if settings['rev_hash_bytes'] == 'true':
  93                                 resp_obj['result'] = hex_switchEndian(resp_obj['result'])
  94                         print(resp_obj['result'])
  95
  96                 height += num_blocks
  97
  98 def get_rpc_cookie():
  99         # Open the cookie file
 100         with open(os.path.join(os.path.expanduser(settings['datadir']), '.cookie'), 'r') as f:
 101                 combined = f.readline()
 102                 combined_split = combined.split(":")
 103                 settings['rpcuser'] = combined_split[0]
 104                 settings['rpcpassword'] = combined_split[1]
 105
 106 if __name__ == '__main__':
 107         if len(sys.argv) != 2:
 108                 print("Usage: linearize-hashes.py CONFIG-FILE")
 109                 sys.exit(1)
 110
 111         f = open(sys.argv[1])
 112         for line in f:
 113                 # skip comment lines
 114                 m = re.search('^\s*#', line)
 115                 if m:
 116                         continue
 117
 118                 # parse key=value lines
 119                 m = re.search('^(\w+)\s*=\s*(\S.*)$', line)
 120                 if m is None:
 121                         continue
 122                 settings[m.group(1)] = m.group(2)
 123         f.close()
 124
 125         if 'host' not in settings:
 126                 settings['host'] = '127.0.0.1'
 127         if 'port' not in settings:
 128                 settings['port'] = 8332
 129         if 'min_height' not in settings:
 130                 settings['min_height'] = 0
 131         if 'max_height' not in settings:
 132                 settings['max_height'] = 313000
 133         if 'rev_hash_bytes' not in settings:
 134                 settings['rev_hash_bytes'] = 'false'
 135
 136         use_userpass = True
 137         use_datadir = False
 138         if 'rpcuser' not in settings or 'rpcpassword' not in settings:
 139                 use_userpass = False
 140         if 'datadir' in settings and not use_userpass:
 141                 use_datadir = True
 142         if not use_userpass and not use_datadir:
 143                 print("Missing datadir or username and/or password in cfg file", file=stderr)
 144                 sys.exit(1)
 145
 146         settings['port'] = int(settings['port'])
 147         settings['min_height'] = int(settings['min_height'])
 148         settings['max_height'] = int(settings['max_height'])
 149
 150         # Force hash byte format setting to be lowercase to make comparisons easier.
 151         settings['rev_hash_bytes'] = settings['rev_hash_bytes'].lower()
 152
 153         # Get the rpc user and pass from the cookie if the datadir is set
 154         if use_datadir:
 155                 get_rpc_cookie()
 156
 157         get_block_hashes(settings)