p2pool/data.py

   1 from __future__ import division
   2
   3 import itertools
   4 import traceback
   5
   6 from p2pool.util import math
   7 from p2pool.bitcoin import data as bitcoin_data
   8
   9 class CompressedList(bitcoin_data.Type):
  10     def __init__(self, inner):
  11         self.inner = inner
  12
  13     def read(self, file):
  14         values = bitcoin_data.ListType(self.inner).read(file)
  15         if values != sorted(set(values)):
  16             raise ValueError("invalid values")
  17         references = bitcoin_data.ListType(bitcoin_data.VarIntType()).read(file)
  18         return [values[reference] for reference in references]
  19
  20     def write(self, file, item):
  21         values = sorted(set(item))
  22         values_map = dict((value, i) for i, value in enumerate(values))
  23         bitcoin_data.ListType(self.inner).write(file, values)
  24         bitcoin_data.ListType(bitcoin_data.VarIntType()).write(file, [values_map[subitem] for subitem in item])
  25
  26
  27 merkle_branch_type = bitcoin_data.ListType(bitcoin_data.ComposedType([
  28     ('side', bitcoin_data.StructType('<B')), # enum?
  29     ('hash', bitcoin_data.HashType()),
  30 ]))
  31
  32
  33 share_data_type = bitcoin_data.ComposedType([
  34     ('previous_share_hash', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
  35     ('previous_shares_hash', bitcoin_data.HashType()),
  36     ('target2', bitcoin_data.FloatingIntegerType()),
  37     ('nonce', bitcoin_data.VarStrType()),
  38 ])
  39
  40
  41 coinbase_type = bitcoin_data.ComposedType([
  42     ('identifier', bitcoin_data.FixedStrType(8)),
  43     ('share_data', share_data_type),
  44 ])
  45
  46 share_info_type = bitcoin_data.ComposedType([
  47     ('share_data', share_data_type),
  48     ('new_script', bitcoin_data.VarStrType()),
  49     ('subsidy', bitcoin_data.StructType('<Q')),
  50 ])
  51
  52
  53 share1a_type = bitcoin_data.ComposedType([
  54     ('header', bitcoin_data.block_header_type), # merkle_header not completely needed
  55     ('share_info', share_info_type),
  56     ('merkle_branch', merkle_branch_type),
  57 ])
  58
  59 share1b_type = bitcoin_data.ComposedType([
  60     ('header', bitcoin_data.block_header_type),
  61     ('share_info', share_info_type),
  62     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  63 ])
  64
  65 shares_type = CompressedList(bitcoin_data.VarStrType())
  66
  67 def calculate_merkle_branch(txs, index):
  68     hash_list = [(bitcoin_data.tx_type.hash256(tx), i == index, []) for i, tx in enumerate(txs)]
  69
  70     while len(hash_list) > 1:
  71         hash_list = [
  72             (
  73                 bitcoin_data.merkle_record_type.hash256(dict(left=left, right=right)),
  74                 left_f or right_f,
  75                 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
  76             )
  77             for (left, left_f, left_l), (right, right_f, right_l) in
  78                 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
  79         ]
  80
  81     assert hash_list[0][1]
  82     assert check_merkle_branch(txs[index], hash_list[0][2]) == hash_list[0][0]
  83
  84     return hash_list[0][2]
  85
  86 def check_merkle_branch(tx, branch):
  87     hash_ = bitcoin_data.tx_type.hash256(tx)
  88     for step in branch:
  89         if not step['side']:
  90             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=step['hash'], right=hash_))
  91         else:
  92             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=hash_, right=step['hash']))
  93     return hash_
  94
  95 def gentx_to_share_info(gentx):
  96     return dict(
  97         share_data=coinbase_type.unpack(gentx['tx_ins'][0]['script'])['share_data'],
  98         subsidy=sum(tx_out['value'] for tx_out in gentx['tx_outs']),
  99         new_script=gentx['tx_outs'][-1]['script'],
 100     )
 101
 102 def share_info_to_gentx(share_info, block_target, tracker, net):
 103     return generate_transaction(
 104         tracker=tracker,
 105         previous_share_hash=share_info['share_data']['previous_share_hash'],
 106         new_script=share_info['new_script'],
 107         subsidy=share_info['subsidy'],
 108         nonce=share_info['share_data']['nonce'],
 109         block_target=block_target,
 110         net=net,
 111     )
 112
 113 class Share(object):
 114     peer = None
 115
 116     @classmethod
 117     def from_block(cls, block):
 118         return cls(block['header'], gentx_to_share_info(block['txs'][0]), other_txs=block['txs'][1:])
 119
 120     @classmethod
 121     def from_share1a(cls, share1a):
 122         return cls(**share1a)
 123
 124     @classmethod
 125     def from_share1b(cls, share1b):
 126         return cls(**share1b)
 127
 128     def __init__(self, header, share_info, merkle_branch=None, other_txs=None):
 129         if merkle_branch is None and other_txs is None:
 130             raise ValueError('need either merkle_branch or other_txs')
 131
 132         self.header = header
 133         self.share_info = share_info
 134         self.merkle_branch = merkle_branch
 135         self.other_txs = other_txs
 136
 137         self.timestamp = self.header['timestamp']
 138
 139         self.share_data = self.share_info['share_data']
 140         self.new_script = self.share_info['new_script']
 141         self.subsidy = self.share_info['subsidy']
 142
 143         self.previous_share_hash = self.share_data['previous_share_hash']
 144         self.previous_shares_hash = self.share_data['previous_shares_hash']
 145         self.target2 = self.share_data['target2']
 146
 147         self.hash = bitcoin_data.block_header_type.hash256(header)
 148
 149         if self.hash > self.target2:
 150             print "hash", hex(self.hash)
 151             print "targ", hex(self.target2)
 152             raise ValueError('not enough work!')
 153
 154
 155         self.shared = False
 156
 157     def as_block(self):
 158         if self.txs is None:
 159             raise ValueError('share does not contain all txs')
 160
 161         return dict(header=self.header, txs=self.txs)
 162
 163     def as_share1a(self):
 164         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 165
 166     def as_share1b(self):
 167         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 168
 169     def check(self, tracker, net):
 170         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 171
 172         if self.merkle_branch is not None:
 173             if check_merkle_branch(gentx, self.merkle_branch) != self.header['merkle_root']:
 174                 raise ValueError("gentx doesn't match header via merkle_branch")
 175
 176         if self.other_txs is not None:
 177             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 178                 raise ValueError("gentx doesn't match header via other_txs")
 179
 180         return Share2(self)
 181
 182     def flag_shared(self):
 183         self.shared = True
 184
 185     def __repr__(self):
 186         return '<Share %s>' % (' '.join('%s=%r' % (k, v) for k, v in self.__dict__.iteritems()),)
 187
 188 class Share2(object):
 189     '''Share with associated data'''
 190
 191     def __init__(self, share):
 192         self.share = share
 193
 194         self.shared = False
 195
 196     def flag_shared(self):
 197         self.shared = True
 198
 199 def generate_transaction(tracker, previous_share_hash, new_script, subsidy, nonce, block_target, net):
 200     previous_share2 = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 201     #previous_share2 = chain.shares
 202     #previous_shares
 203     #shares =
 204     #shares = (previous_share2.shares if previous_share2 is not None else [net.SCRIPT]*net.SPREAD)[1:-1] + [new_script, new_script]
 205
 206     lookbehind = 120
 207     chain = list(itertools.islice(tracker.get_chain_to_root(previous_share_hash), lookbehind))
 208     if len(chain) < lookbehind:
 209         target2 = bitcoin_data.FloatingIntegerType().truncate_to(2**256//2**16 - 1)
 210     else:
 211         attempts = sum(bitcoin_data.target_to_average_attempts(share.target2) for share in chain)
 212         time = chain[0].timestamp - chain[-1].timestamp
 213         if time == 0:
 214             time = 1
 215         attempts_per_second = attempts//time
 216         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 217         pre_target2 = math.clip(pre_target, (previous_share2.target2*9//10, previous_share2.target2*11//10))
 218         pre_target3 = math.clip(pre_target2, (0, 2**256//2**16 - 1))
 219         target2 = bitcoin_data.FloatingIntegerType().truncate_to(pre_target3)
 220         print attempts_per_second//1000, "KHASH"
 221         print "TARGET", 2**256//target2, 2**256/pre_target
 222         print "ATT", bitcoin_data.target_to_average_attempts(target2)//1000
 223
 224
 225     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 226     max_weight = net.SPREAD * attempts_to_block
 227     total_weight = 0
 228
 229     class fake_share(object):
 230         script = new_script
 231         share = dict(target=target2)
 232
 233     dest_weights = {}
 234     for i, share in enumerate(itertools.chain([fake_share], itertools.islice(tracker.get_chain_to_root(previous_share_hash), net.CHAIN_LENGTH))):
 235         weight = bitcoin_data.target_to_average_attempts(share.share['target'])
 236         weight = max(weight, max_weight - total_weight)
 237
 238         dest_weights[share.script] = dest_weights.get(share.script, 0) + weight
 239         total_weight += weight
 240
 241         if total_weight == max_weight:
 242             break
 243
 244     amounts = dict((script, subsidy*(199*weight)//(200*total_weight)) for (script, weight) in dest_weights.iteritems())
 245     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*1//200
 246     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 247
 248     dests = sorted(amounts.iterkeys(), key=lambda script: (script == new_script, script))
 249     assert dests[-1] == new_script
 250
 251     previous_shares = [] # XXX
 252
 253     return dict(
 254         version=1,
 255         tx_ins=[dict(
 256             previous_output=None,
 257             sequence=None,
 258             script=coinbase_type.pack(dict(
 259                 identifier=net.IDENTIFIER,
 260                 share_data=dict(
 261                     previous_share_hash=previous_share_hash,
 262                     previous_shares_hash=shares_type.hash256(previous_shares),
 263                     nonce=nonce,
 264                     target2=target2,
 265                 ),
 266             )),
 267         )],
 268         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 269         lock_time=0,
 270     )
 271
 272
 273 class Tracker(object):
 274     def __init__(self):
 275         self.shares = {} # hash -> share
 276         self.reverse_shares = {} # previous_share_hash -> set of share_hashes
 277
 278         self.heads = {} # head hash -> tail_hash
 279         self.tails = {} # tail hash -> set of head hashes
 280         self.heights = {} # share_hash -> height_to, other_share_hash
 281
 282     def add_share(self, share):
 283         if share.hash in self.shares:
 284             return # XXX raise exception?
 285
 286         self.shares[share.hash] = share
 287         self.reverse_shares.setdefault(share.previous_share_hash, set()).add(share.hash)
 288
 289         if share.hash in self.tails:
 290             heads = self.tails.pop(share.hash)
 291         else:
 292             heads = set([share.hash])
 293
 294         if share.previous_share_hash in self.heads:
 295             tail = self.heads.pop(share.previous_share_hash)
 296         else:
 297             tail = share.previous_share_hash
 298
 299         self.tails.setdefault(tail, set()).update(heads)
 300         if share.previous_share_hash in self.tails[tail]:
 301             self.tails[tail].remove(share.previous_share_hash)
 302
 303         for head in heads:
 304             self.heads[head] = tail
 305
 306     def get_height_and_last(self, share_hash):
 307         orig = share_hash
 308         height = 0
 309         updates = []
 310         while True:
 311             if share_hash is None or share_hash not in self.shares:
 312                 break
 313             updates.append((share_hash, height))
 314             if share_hash in self.heights:
 315                 height_inc, share_hash = self.heights[share_hash]
 316             else:
 317                 height_inc, share_hash = 1, self.shares[share_hash].previous_share_hash
 318             height += height_inc
 319         for update_hash, height_then in updates:
 320             self.heights[update_hash] = height - height_then, share_hash
 321         assert (height, share_hash) == self.get_height_and_last2(orig), ((height, share_hash), self.get_height_and_last2(orig))
 322         return height, share_hash
 323
 324     def get_height_and_last2(self, share_hash):
 325         height = 0
 326         while True:
 327             if share_hash not in self.shares:
 328                 break
 329             share_hash = self.shares[share_hash].previous_share_hash
 330             height += 1
 331         return height, share_hash
 332
 333     def get_chain_known(self, share_hash):
 334         while True:
 335             if share_hash not in self.shares:
 336                 break
 337             yield share_hash
 338             share_hash = self.shares[share_hash].previous_share_hash
 339
 340     def get_chain_to_root(self, start):
 341         share_hash_to_get = start
 342         while share_hash_to_get is not None:
 343             share = self.shares[share_hash_to_get]
 344             yield share
 345             share_hash_to_get = share.previous_share_hash
 346
 347
 348     def get_best_share_hash(self):
 349         return None
 350         return max(self.heads, key=self.score_chain)
 351     '''
 352     def score_chain(self, start):
 353         length = len(self.get_chain(start))
 354
 355         score = 0
 356         for share in itertools.islice(self.get_chain(start), self.net.CHAIN_LENGTH):
 357             score += a
 358
 359         return (min(length, 1000), score)
 360     '''
 361
 362 if __name__ == '__main__':
 363     class FakeShare(object):
 364         def __init__(self, hash, previous_share_hash):
 365             self.hash = hash
 366             self.previous_share_hash = previous_share_hash
 367
 368     t = Tracker()
 369
 370     t.add_share(FakeShare(1, 2))
 371     print t.heads, t.tails
 372     t.add_share(FakeShare(4, 0))
 373     print t.heads, t.tails
 374     t.add_share(FakeShare(3, 4))
 375     print t.heads, t.tails
 376     t.add_share(FakeShare(5, 0))
 377     print t.heads, t.tails
 378     t.add_share(FakeShare(0, 1))
 379     print t.heads, t.tails
 380
 381     for share_hash in t.shares:
 382         print share_hash, t.get_height_and_last(share_hash)
 383
 384 class OkayTracker(Tracker):
 385     def __init__(self, net):
 386         Tracker.__init__(self)
 387         self.net = net
 388         self.verified = Tracker()
 389     """
 390         self.okay_cache = {} # hash -> height
 391
 392     def is_okay(self, start, _height_after=0):
 393         '''
 394         Returns:
 395             {'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
 396             {'result': 'needs_share', 'share_hash': ...} # if share doesn't have CHAIN_LENGTH parents
 397             #{'result': 'needs_share_shares', 'share_hash': ...} # if share has CHAIN_LENGTH children and needs its shares to
 398             {'result': 'not_okay'} # if the share has a not okay parent or if the share has an okay parent and failed validation
 399         '''
 400
 401         if start in self.okay_cache:
 402             return dict(result='okay', verified_height=self.okay_cache['start'])
 403
 404         share = self.shares[start]
 405         if start not in self.shares:
 406             return dict(result='needs_share', share_hash=start)
 407
 408         length = len
 409         to_end_rev = []
 410         for share in itertools.islice(self.get_chain(start), self.net.CHAIN_LENGTH):
 411             if share in self.okay_cache:
 412                 return validate(share, to_end_rev[::-1])
 413             to_end_rev.append(share)
 414         # picking up last share from for loop, ew
 415         self.okay_cache.add(share)
 416         return validate(share, to_end_rev[::-1])
 417     """
 418     def think(self):
 419         desired = set()
 420
 421         # for each overall head, attempt verification
 422         # if it fails, attempt on parent, and repeat
 423         # if no successful verification because of lack of parents, request parent
 424         for head in self.heads:
 425             head_height, last = self.get_height_and_last(head)
 426             if head_height < a and last is not None:
 427                 # request more
 428
 429             for share in itertools.islice(self.get_chain_known(head), None if last is None else head_height - self.net.CHAIN_LENGTH): # XXX change length for None
 430                 in share in self.verified.shares:
 431                     break
 432                 try:
 433                     share.check(self, self.net)
 434                 except:
 435                     print
 436                     print "Share check failed:"
 437                     traceback.print_exc()
 438                     print
 439                 else:
 440                     self.verified.add_share(share_hash)
 441                     break
 442
 443         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 444         for head in self.verified.heads:
 445             head_height, last = self.verified.get_height_and_last(head)
 446             a
 447
 448         # decide best verified head
 449         def score(share_hash):
 450             share = self.verified.shares[share_hash]
 451             head_height, last = self.verified.get_height_and_last(share)
 452             return (min(head_height, net.CHAIN_LENGTH), RECENTNESS)
 453         best = max(self.verified.heads, key=score)
 454
 455         return best, desired
 456
 457
 458 class Mainnet(bitcoin_data.Mainnet):
 459     SHARE_PERIOD = 5 # seconds
 460     CHAIN_LENGTH = 24*60*60//5 # shares
 461     SPREAD = 3 # blocks
 462     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 463     IDENTIFIER = '7452839666e1f8f8'.decode('hex')
 464     PREFIX = '2d4224bf18c87b87'.decode('hex')
 465     ADDRS_TABLE = 'addrs'
 466     P2P_PORT = 9333
 467
 468 class Testnet(bitcoin_data.Testnet):
 469     SHARE_PERIOD = 5 # seconds
 470     CHAIN_LENGTH = 24*60*60//5 # shares
 471     SPREAD = 3 # blocks
 472     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 473     IDENTIFIER = '1ae3479e4eb6700a'.decode('hex')
 474     PREFIX = 'd19778c812754854'.decode('hex')
 475     ADDRS_TABLE = 'addrs_testnet'
 476     P2P_PORT = 19333