p2pool/data.py

   1 from __future__ import division
   2
   3 import itertools
   4 import random
   5 import traceback
   6
   7 from p2pool.util import math
   8 from p2pool.bitcoin import data as bitcoin_data
   9
  10 class CompressedList(bitcoin_data.Type):
  11     def __init__(self, inner):
  12         self.inner = inner
  13
  14     def read(self, file):
  15         values, file = bitcoin_data.ListType(self.inner).read(file)
  16         if values != sorted(set(values)):
  17             raise ValueError("invalid values")
  18         references, file = bitcoin_data.ListType(bitcoin_data.VarIntType()).read(file)
  19         return [values[reference] for reference in references], file
  20
  21     def write(self, file, item):
  22         values = sorted(set(item))
  23         values_map = dict((value, i) for i, value in enumerate(values))
  24         file = bitcoin_data.ListType(self.inner).write(file, values)
  25         return bitcoin_data.ListType(bitcoin_data.VarIntType()).write(file, [values_map[subitem] for subitem in item])
  26
  27
  28 merkle_branch_type = bitcoin_data.ListType(bitcoin_data.ComposedType([
  29     ('side', bitcoin_data.StructType('<B')), # enum?
  30     ('hash', bitcoin_data.HashType()),
  31 ]))
  32
  33
  34 share_data_type = bitcoin_data.ComposedType([
  35     ('previous_share_hash', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
  36     ('previous_shares_hash', bitcoin_data.HashType()),
  37     ('target2', bitcoin_data.FloatingIntegerType()),
  38     ('nonce', bitcoin_data.VarStrType()),
  39 ])
  40
  41
  42 coinbase_type = bitcoin_data.ComposedType([
  43     ('identifier', bitcoin_data.FixedStrType(8)),
  44     ('share_data', share_data_type),
  45 ])
  46
  47 share_info_type = bitcoin_data.ComposedType([
  48     ('share_data', share_data_type),
  49     ('new_script', bitcoin_data.VarStrType()),
  50     ('subsidy', bitcoin_data.StructType('<Q')),
  51 ])
  52
  53
  54 share1a_type = bitcoin_data.ComposedType([
  55     ('header', bitcoin_data.block_header_type), # merkle_header not completely needed
  56     ('share_info', share_info_type),
  57     ('merkle_branch', merkle_branch_type),
  58 ])
  59
  60 share1b_type = bitcoin_data.ComposedType([
  61     ('header', bitcoin_data.block_header_type),
  62     ('share_info', share_info_type),
  63     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  64 ])
  65
  66 shares_type = CompressedList(bitcoin_data.VarStrType())
  67
  68 def calculate_merkle_branch(txs, index):
  69     hash_list = [(bitcoin_data.tx_type.hash256(tx), i == index, []) for i, tx in enumerate(txs)]
  70
  71     while len(hash_list) > 1:
  72         hash_list = [
  73             (
  74                 bitcoin_data.merkle_record_type.hash256(dict(left=left, right=right)),
  75                 left_f or right_f,
  76                 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
  77             )
  78             for (left, left_f, left_l), (right, right_f, right_l) in
  79                 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
  80         ]
  81
  82     assert hash_list[0][1]
  83     assert check_merkle_branch(txs[index], hash_list[0][2]) == hash_list[0][0]
  84
  85     return hash_list[0][2]
  86
  87 def check_merkle_branch(tx, branch):
  88     hash_ = bitcoin_data.tx_type.hash256(tx)
  89     for step in branch:
  90         if not step['side']:
  91             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=step['hash'], right=hash_))
  92         else:
  93             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=hash_, right=step['hash']))
  94     return hash_
  95
  96 def gentx_to_share_info(gentx):
  97     return dict(
  98         share_data=coinbase_type.unpack(gentx['tx_ins'][0]['script'])['share_data'],
  99         subsidy=sum(tx_out['value'] for tx_out in gentx['tx_outs']),
 100         new_script=gentx['tx_outs'][-1]['script'],
 101     )
 102
 103 def share_info_to_gentx(share_info, block_target, tracker, net):
 104     return generate_transaction(
 105         tracker=tracker,
 106         previous_share_hash=share_info['share_data']['previous_share_hash'],
 107         new_script=share_info['new_script'],
 108         subsidy=share_info['subsidy'],
 109         nonce=share_info['share_data']['nonce'],
 110         block_target=block_target,
 111         net=net,
 112     )
 113
 114 class Share(object):
 115     peer = None
 116
 117     @classmethod
 118     def from_block(cls, block):
 119         return cls(block['header'], gentx_to_share_info(block['txs'][0]), other_txs=block['txs'][1:])
 120
 121     @classmethod
 122     def from_share1a(cls, share1a):
 123         return cls(**share1a)
 124
 125     @classmethod
 126     def from_share1b(cls, share1b):
 127         return cls(**share1b)
 128
 129     def __init__(self, header, share_info, merkle_branch=None, other_txs=None):
 130         if merkle_branch is None and other_txs is None:
 131             raise ValueError('need either merkle_branch or other_txs')
 132         if other_txs is not None:
 133             new_merkle_branch = calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
 134             if merkle_branch is not None:
 135                 if merke_branch != new_merkle_branch:
 136                     raise ValueError('invalid merkle_branch and other_txs')
 137             merkle_branch = new_merkle_branch
 138
 139         self.header = header
 140         self.share_info = share_info
 141         self.merkle_branch = merkle_branch
 142         self.other_txs = other_txs
 143
 144         self.timestamp = self.header['timestamp']
 145
 146         self.share_data = self.share_info['share_data']
 147         self.new_script = self.share_info['new_script']
 148         self.subsidy = self.share_info['subsidy']
 149
 150         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 151         self.previous_shares_hash = self.share_data['previous_shares_hash']
 152         self.target2 = self.share_data['target2']
 153
 154         self.hash = bitcoin_data.block_header_type.hash256(header)
 155
 156         if self.hash > self.target2:
 157             print "hash", hex(self.hash)
 158             print "targ", hex(self.target2)
 159             raise ValueError('not enough work!')
 160
 161
 162         self.shared = False
 163
 164     def as_block(self):
 165         if self.txs is None:
 166             raise ValueError('share does not contain all txs')
 167
 168         return dict(header=self.header, txs=self.txs)
 169
 170     def as_share1a(self):
 171         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 172
 173     def as_share1b(self):
 174         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 175
 176     def check(self, tracker, net):
 177         import time
 178         if self.previous_share_hash is not None:
 179             if self.header['timestamp'] <= math.median((s.timestamp for s in itertools.islice(tracker.get_chain_to_root(self.previous_share_hash), 11)), use_float=False):
 180                 raise ValueError('share from too far in the past!')
 181
 182         if self.header['timestamp'] > time.time() + 2*60*60:
 183             raise ValueError('share from too far in the future!')
 184
 185         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 186
 187         if self.merkle_branch is not None:
 188             if check_merkle_branch(gentx, self.merkle_branch) != self.header['merkle_root']:
 189                 raise ValueError("gentx doesn't match header via merkle_branch")
 190
 191         if self.other_txs is not None:
 192             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 193                 raise ValueError("gentx doesn't match header via other_txs")
 194
 195         return Share2(self)
 196
 197     def flag_shared(self):
 198         self.shared = True
 199
 200     def __repr__(self):
 201         return '<Share %s>' % (' '.join('%s=%r' % (k, v) for k, v in self.__dict__.iteritems()),)
 202
 203 class Share2(object):
 204     '''Share with associated data'''
 205
 206     def __init__(self, share):
 207         self.share = share
 208
 209         self.shared = False
 210
 211     def flag_shared(self):
 212         self.shared = True
 213
 214 def generate_transaction(tracker, previous_share_hash, new_script, subsidy, nonce, block_target, net):
 215     previous_share2 = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 216     #previous_share2 = chain.shares
 217     #previous_shares
 218     #shares =
 219     #shares = (previous_share2.shares if previous_share2 is not None else [net.SCRIPT]*net.SPREAD)[1:-1] + [new_script, new_script]
 220
 221     lookbehind = 200
 222     chain = list(itertools.islice(tracker.get_chain_to_root(previous_share_hash), lookbehind))
 223     if len(chain) < lookbehind:
 224         target2 = bitcoin_data.FloatingIntegerType().truncate_to(2**256//2**16 - 1)
 225     else:
 226         attempts = sum(bitcoin_data.target_to_average_attempts(share.target2) for share in chain[:-1])
 227         time = chain[0].timestamp - chain[-1].timestamp
 228         if time == 0:
 229             time = 1
 230         attempts_per_second = attempts//time
 231         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 232         pre_target2 = math.clip(pre_target, (previous_share2.target2*9//10, previous_share2.target2*11//10))
 233         pre_target3 = math.clip(pre_target2, (0, 2**256//2**16 - 1))
 234         target2 = bitcoin_data.FloatingIntegerType().truncate_to(pre_target3)
 235         print attempts_per_second//1000, "KHASH"
 236         #print "TARGET", 2**256//target2, 2**256/pre_target
 237         #print "ATT", bitcoin_data.target_to_average_attempts(target2)//1000
 238
 239
 240     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 241     max_weight = net.SPREAD * attempts_to_block
 242     total_weight = 0
 243
 244     class fake_share(object):
 245         script = new_script
 246         share = dict(target=target2)
 247
 248     dest_weights = {}
 249     for i, share in enumerate(itertools.chain([fake_share], itertools.islice(tracker.get_chain_to_root(previous_share_hash), net.CHAIN_LENGTH))):
 250         weight = bitcoin_data.target_to_average_attempts(share.share['target'])
 251         weight = max(weight, max_weight - total_weight)
 252
 253         dest_weights[share.script] = dest_weights.get(share.script, 0) + weight
 254         total_weight += weight
 255
 256         if total_weight == max_weight:
 257             break
 258
 259     amounts = dict((script, subsidy*(199*weight)//(200*total_weight)) for (script, weight) in dest_weights.iteritems())
 260     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*1//200
 261     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 262
 263     dests = sorted(amounts.iterkeys(), key=lambda script: (script == new_script, script))
 264     assert dests[-1] == new_script
 265
 266     previous_shares = [] # XXX
 267
 268     return dict(
 269         version=1,
 270         tx_ins=[dict(
 271             previous_output=None,
 272             sequence=None,
 273             script=coinbase_type.pack(dict(
 274                 identifier=net.IDENTIFIER,
 275                 share_data=dict(
 276                     previous_share_hash=previous_share_hash,
 277                     previous_shares_hash=shares_type.hash256(previous_shares),
 278                     nonce=nonce,
 279                     target2=target2,
 280                 ),
 281             )),
 282         )],
 283         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 284         lock_time=0,
 285     )
 286
 287
 288
 289
 290 if __name__ == '__main__':
 291     class FakeShare(object):
 292         def __init__(self, hash, previous_share_hash):
 293             self.hash = hash
 294             self.previous_share_hash = previous_share_hash
 295
 296     t = Tracker()
 297
 298     t.add_share(FakeShare(1, 2))
 299     print t.heads, t.tails
 300     t.add_share(FakeShare(4, 0))
 301     print t.heads, t.tails
 302     t.add_share(FakeShare(3, 4))
 303     print t.heads, t.tails
 304     t.add_share(FakeShare(5, 0))
 305     print t.heads, t.tails
 306     t.add_share(FakeShare(0, 1))
 307     print t.heads, t.tails
 308
 309     for share_hash in t.shares:
 310         print share_hash, t.get_height_and_last(share_hash)
 311
 312 class OkayTracker(bitcoin_data.Tracker):
 313     def __init__(self, net):
 314         bitcoin_data.Tracker.__init__(self)
 315         self.net = net
 316         self.verified = bitcoin_data.Tracker()
 317     """
 318         self.okay_cache = {} # hash -> height
 319
 320     def is_okay(self, start, _height_after=0):
 321         '''
 322         Returns:
 323             {'result': 'okay', verified_height: ...} # if share has an okay parent or if share has CHAIN_LENGTH children and CHAIN_LENTH parents that it verified with
 324             {'result': 'needs_share', 'share_hash': ...} # if share doesn't have CHAIN_LENGTH parents
 325             #{'result': 'needs_share_shares', 'share_hash': ...} # if share has CHAIN_LENGTH children and needs its shares to
 326             {'result': 'not_okay'} # if the share has a not okay parent or if the share has an okay parent and failed validation
 327         '''
 328
 329         if start in self.okay_cache:
 330             return dict(result='okay', verified_height=self.okay_cache['start'])
 331
 332         share = self.shares[start]
 333         if start not in self.shares:
 334             return dict(result='needs_share', share_hash=start)
 335
 336         length = len
 337         to_end_rev = []
 338         for share in itertools.islice(self.get_chain(start), self.net.CHAIN_LENGTH):
 339             if share in self.okay_cache:
 340                 return validate(share, to_end_rev[::-1])
 341             to_end_rev.append(share)
 342         # picking up last share from for loop, ew
 343         self.okay_cache.add(share)
 344         return validate(share, to_end_rev[::-1])
 345     """
 346     def attempt_verify(self, share):
 347         if share.hash in self.verified.shares:
 348             return True
 349         try:
 350             share.check(self, self.net)
 351         except:
 352             print
 353             print "Share check failed:"
 354             traceback.print_exc()
 355             print
 356             return False
 357         else:
 358             self.verified.add(share)
 359             return True
 360     def think(self):
 361         desired = set()
 362
 363         # for each overall head, attempt verification
 364         # if it fails, attempt on parent, and repeat
 365         # if no successful verification because of lack of parents, request parent
 366         for head in self.heads:
 367             head_height, last = self.get_height_and_last(head)
 368             if head_height < self.net.CHAIN_LENGTH and last is not None:
 369                 # request more
 370                 print 1, hex(last)
 371                 desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 372                 continue
 373
 374             for share in itertools.islice(self.get_chain_known(head), None if last is None else head_height - self.net.CHAIN_LENGTH):
 375                 if self.attempt_verify(share):
 376                     break
 377
 378         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 379         for head in self.verified.heads:
 380             head_height, last = self.verified.get_height_and_last(head)
 381             last_height, last_last = self.get_height_and_last(last)
 382             for share in itertools.islice(self.get_chain_known(last), max(0, min(self.net.CHAIN_LENGTH - head_height, last_height - 1 - self.net.CHAIN_LENGTH))):
 383                 if not self.attempt_verify(share):
 384                     break
 385             if head_height < self.net.CHAIN_LENGTH and last_last is not None:
 386                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last]))].peer, last_last))
 387
 388         # decide best verified head
 389         def score(share_hash):
 390             share = self.verified.shares[share_hash]
 391             head_height, last = self.verified.get_height_and_last(share)
 392             RECENTNESS = 0
 393             return (min(head_height, self.net.CHAIN_LENGTH), RECENTNESS)
 394         best = max(self.verified.heads, key=score) if self.verified.heads else None
 395
 396         return best, desired
 397
 398
 399 class Mainnet(bitcoin_data.Mainnet):
 400     SHARE_PERIOD = 5 # seconds
 401     CHAIN_LENGTH = 24*60*60//5 # shares
 402     SPREAD = 3 # blocks
 403     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 404     IDENTIFIER = '7452839666e1f8f8'.decode('hex')
 405     PREFIX = '2d4224bf18c87b87'.decode('hex')
 406     ADDRS_TABLE = 'addrs'
 407     P2P_PORT = 9333
 408
 409 class Testnet(bitcoin_data.Testnet):
 410     SHARE_PERIOD = 5 # seconds
 411     CHAIN_LENGTH = 24*60*60//5 # shares
 412     SPREAD = 3 # blocks
 413     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 414     IDENTIFIER = '1ae3479e4eb6700a'.decode('hex')
 415     PREFIX = 'd19778c812754854'.decode('hex')
 416     ADDRS_TABLE = 'addrs_testnet'
 417     P2P_PORT = 19333