p2pool/data.py

   1 from __future__ import division
   2
   3 import itertools
   4 import random
   5 import time
   6 import os
   7
   8 from twisted.python import log
   9
  10 import p2pool
  11 from p2pool import skiplists
  12 from p2pool.bitcoin import data as bitcoin_data, script
  13 from p2pool.util import memoize, expiring_dict, math, forest
  14
  15
  16 share_data_type = bitcoin_data.ComposedType([
  17     ('previous_share_hash', bitcoin_data.PossiblyNoneType(0, bitcoin_data.HashType())),
  18     ('coinbase', bitcoin_data.VarStrType()),
  19     ('nonce', bitcoin_data.VarStrType()),
  20     ('new_script', bitcoin_data.VarStrType()),
  21     ('subsidy', bitcoin_data.StructType('<Q')),
  22     ('donation', bitcoin_data.StructType('<H')),
  23     ('stale_frac', bitcoin_data.StructType('<B')),
  24 ])
  25
  26 share_info_type = bitcoin_data.ComposedType([
  27     ('share_data', share_data_type),
  28     ('target', bitcoin_data.FloatingIntegerType()),
  29     ('timestamp', bitcoin_data.StructType('<I')),
  30 ])
  31
  32 share1a_type = bitcoin_data.ComposedType([
  33     ('header', bitcoin_data.block_header_type),
  34     ('share_info', share_info_type),
  35     ('merkle_branch', bitcoin_data.merkle_branch_type),
  36 ])
  37
  38 share1b_type = bitcoin_data.ComposedType([
  39     ('header', bitcoin_data.block_header_type),
  40     ('share_info', share_info_type),
  41     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  42 ])
  43
  44 # type:
  45 # 0: share1a
  46 # 1: share1b
  47
  48 share_type = bitcoin_data.ComposedType([
  49     ('type', bitcoin_data.VarIntType()),
  50     ('contents', bitcoin_data.VarStrType()),
  51 ])
  52
  53 class Share(object):
  54     __slots__ = 'header previous_block share_info merkle_branch other_txs timestamp share_data new_script subsidy previous_hash previous_share_hash target nonce pow_hash header_hash hash time_seen peer donation stale_frac'.split(' ')
  55
  56     @classmethod
  57     def from_share(cls, share, net):
  58         if share['type'] == 0:
  59             res = cls.from_share1a(share1a_type.unpack(share['contents']), net)
  60             if not (res.pow_hash > res.header['target']):
  61                 raise ValueError('invalid share type')
  62             return res
  63         elif share['type'] == 1:
  64             res = cls.from_share1b(share1b_type.unpack(share['contents']), net)
  65             if not (res.pow_hash <= res.header['target']):
  66                 raise ValueError('invalid share type')
  67             return res
  68         else:
  69             raise ValueError('unknown share type: %r' % (share['type'],))
  70
  71     @classmethod
  72     def from_share1a(cls, share1a, net):
  73         return cls(net, **share1a)
  74
  75     @classmethod
  76     def from_share1b(cls, share1b, net):
  77         return cls(net, **share1b)
  78
  79     def __init__(self, net, header, share_info, merkle_branch=None, other_txs=None):
  80         if merkle_branch is None and other_txs is None:
  81             raise ValueError('need either merkle_branch or other_txs')
  82         if other_txs is not None:
  83             new_merkle_branch = bitcoin_data.calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
  84             if merkle_branch is not None:
  85                 if merke_branch != new_merkle_branch:
  86                     raise ValueError('invalid merkle_branch and other_txs')
  87             merkle_branch = new_merkle_branch
  88
  89         if len(merkle_branch) > 16:
  90             raise ValueError('merkle_branch too long!')
  91
  92         self.header = header
  93         self.previous_block = header['previous_block']
  94         self.share_info = share_info
  95         self.merkle_branch = merkle_branch
  96         self.other_txs = other_txs
  97
  98         self.share_data = self.share_info['share_data']
  99         self.target = self.share_info['target']
 100         self.timestamp = self.share_info['timestamp']
 101
 102         self.new_script = self.share_data['new_script']
 103         self.subsidy = self.share_data['subsidy']
 104         self.donation = self.share_data['donation']
 105
 106         if len(self.new_script) > 100:
 107             raise ValueError('new_script too long!')
 108
 109         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 110         self.nonce = self.share_data['nonce']
 111
 112         if len(self.nonce) > 100:
 113             raise ValueError('nonce too long!')
 114
 115         if len(self.share_data['coinbase']) > 100:
 116             raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
 117
 118         self.pow_hash = net.BITCOIN_POW_FUNC(header)
 119         self.header_hash = bitcoin_data.block_header_type.hash256(header)
 120
 121         self.hash = share1a_type.hash256(self.as_share1a())
 122
 123         if self.pow_hash > self.target:
 124             print 'hash %x' % self.pow_hash
 125             print 'targ %x' % self.target
 126             raise ValueError('not enough work!')
 127
 128         if script.get_sigop_count(self.new_script) > 1:
 129             raise ValueError('too many sigops!')
 130
 131         self.stale_frac = self.share_data['stale_frac']/254 if self.share_data['stale_frac'] != 255 else None
 132
 133         # XXX eww
 134         self.time_seen = time.time()
 135         self.peer = None
 136
 137     def __repr__(self):
 138         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 139
 140     def check(self, tracker, now, net):
 141         share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['target'], self.share_info['timestamp'], net)
 142         if share_info != self.share_info:
 143             raise ValueError('share difficulty invalid')
 144
 145         if bitcoin_data.check_merkle_branch(gentx, 0, self.merkle_branch) != self.header['merkle_root']:
 146             raise ValueError('''gentx doesn't match header via merkle_branch''')
 147
 148     def as_share(self):
 149         if self.pow_hash > self.header['target']: # share1a
 150             return dict(type=0, contents=share1a_type.pack(self.as_share1a()))
 151         elif self.pow_hash <= self.header['target']: # share1b
 152             return dict(type=1, contents=share1b_type.pack(self.as_share1b()))
 153         else:
 154             raise AssertionError()
 155
 156     def as_share1a(self):
 157         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 158
 159     def as_share1b(self):
 160         if self.other_txs is None:
 161             raise ValueError('share does not contain all txs')
 162
 163         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 164
 165     def as_block(self, tracker, net):
 166         if self.other_txs is None:
 167             raise ValueError('share does not contain all txs')
 168
 169         share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['target'], self.share_info['timestamp'], net)
 170         assert share_info == self.share_info
 171
 172         return dict(header=self.header, txs=[gentx] + self.other_txs)
 173
 174 def get_pool_attempts_per_second(tracker, previous_share_hash, dist):
 175     near = tracker.shares[previous_share_hash]
 176     far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 177     attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
 178     time = near.timestamp - far.timestamp
 179     if time == 0:
 180         time = 1
 181     return attempts//time
 182
 183 def generate_transaction(tracker, share_data, block_target, desired_timestamp, net):
 184     previous_share_hash = share_data['previous_share_hash']
 185     new_script = share_data['new_script']
 186     subsidy = share_data['subsidy']
 187     donation = share_data['donation']
 188     assert 0 <= donation <= 65535
 189
 190     if len(share_data['coinbase']) > 100:
 191         raise ValueError('coinbase too long!')
 192
 193     previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 194
 195     chain_length = getattr(net, 'REAL_CHAIN_LENGTH_FUNC', lambda _: net.REAL_CHAIN_LENGTH)(previous_share.timestamp if previous_share is not None else None)
 196
 197     height, last = tracker.get_height_and_last(previous_share_hash)
 198     assert height >= chain_length or last is None
 199     if height < net.TARGET_LOOKBEHIND:
 200         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 201     else:
 202         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net.TARGET_LOOKBEHIND)
 203         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 204         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 205         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 206         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 207
 208     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 209     max_att = net.SPREAD * attempts_to_block
 210
 211     this_att = min(bitcoin_data.target_to_average_attempts(target), max_att)
 212     other_weights, other_total_weight, other_donation_weight = tracker.get_cumulative_weights(previous_share_hash, min(height, chain_length), 65535*max(0, max_att - this_att))
 213     assert other_total_weight == sum(other_weights.itervalues()) + other_donation_weight, (other_total_weight, sum(other_weights.itervalues()) + other_donation_weight)
 214     weights, total_weight, donation_weight = math.add_dicts([{new_script: this_att*(65535-donation)}, other_weights]), this_att*65535 + other_total_weight, this_att*donation + other_donation_weight
 215     assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 216
 217     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 218
 219     # 1 satoshi is always donated so that a list of p2pool generated blocks can be easily found by looking at the donation address
 220     amounts = dict((script, (subsidy-1)*(199*weight)//(200*total_weight)) for (script, weight) in weights.iteritems())
 221     amounts[new_script] = amounts.get(new_script, 0) + (subsidy-1)//200
 222     amounts[SCRIPT] = amounts.get(SCRIPT, 0) + (subsidy-1)*(199*donation_weight)//(200*total_weight)
 223     amounts[SCRIPT] = amounts.get(SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra satoshis :P
 224
 225     if sum(amounts.itervalues()) != subsidy:
 226         raise ValueError()
 227     if any(x < 0 for x in amounts.itervalues()):
 228         raise ValueError()
 229
 230     dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 231     dests = dests[-4000:] # block length limit, unlikely to ever be hit
 232
 233     share_info = dict(
 234         share_data=share_data,
 235         target=target,
 236         timestamp=math.clip(desired_timestamp, (previous_share.timestamp - 60, previous_share.timestamp + 60)) if previous_share is not None else desired_timestamp,
 237     )
 238
 239     return share_info, dict(
 240         version=1,
 241         tx_ins=[dict(
 242             previous_output=None,
 243             sequence=None,
 244             script=share_data['coinbase'].ljust(2, '\x00'),
 245         )],
 246         tx_outs=[dict(value=0, script='\x20' + bitcoin_data.HashType().pack(share_info_type.hash256(share_info)))] + [dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 247         lock_time=0,
 248     )
 249
 250
 251 class OkayTracker(forest.Tracker):
 252     def __init__(self, net):
 253         forest.Tracker.__init__(self)
 254         self.net = net
 255         self.verified = forest.Tracker()
 256         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 257
 258         self.get_cumulative_weights = skiplists.WeightsSkipList(self)
 259
 260     def attempt_verify(self, share, now):
 261         if share.hash in self.verified.shares:
 262             return True
 263         height, last = self.get_height_and_last(share.hash)
 264         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 265             raise AssertionError()
 266         try:
 267             share.check(self, now, self.net)
 268         except:
 269             log.err(None, 'Share check failed:')
 270             return False
 271         else:
 272             self.verified.add(share)
 273             return True
 274
 275     def think(self, ht, previous_block, now):
 276         desired = set()
 277
 278         # O(len(self.heads))
 279         #   make 'unverified heads' set?
 280         # for each overall head, attempt verification
 281         # if it fails, attempt on parent, and repeat
 282         # if no successful verification because of lack of parents, request parent
 283         bads = set()
 284         for head in set(self.heads) - set(self.verified.heads):
 285             head_height, last = self.get_height_and_last(head)
 286
 287             for share in itertools.islice(self.get_chain_known(head), None if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
 288                 if self.attempt_verify(share, now):
 289                     break
 290                 if share.hash in self.heads:
 291                     bads.add(share.hash)
 292             else:
 293                 if last is not None:
 294                     desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 295         for bad in bads:
 296             assert bad not in self.verified.shares
 297             assert bad in self.heads
 298             if p2pool.DEBUG:
 299                 print "BAD", bad
 300             self.remove(bad)
 301
 302         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 303         for head in list(self.verified.heads):
 304             head_height, last_hash = self.verified.get_height_and_last(head)
 305             last_height, last_last_hash = self.get_height_and_last(last_hash)
 306             # XXX review boundary conditions
 307             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 308             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 309             get = min(want, can)
 310             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 311             for share in itertools.islice(self.get_chain_known(last_hash), get):
 312                 if not self.attempt_verify(share, now):
 313                     break
 314             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 315                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer, last_last_hash))
 316         if p2pool.DEBUG:
 317             print len(self.verified.tails), "tails:"
 318             for x in self.verified.tails:
 319                 print format_hash(x), self.score(max(self.verified.tails[x], key=self.verified.get_height), ht)
 320
 321         # decide best tree
 322         best_tail = max(self.verified.tails, key=lambda h: self.score(max(self.verified.tails[h], key=self.verified.get_height), ht)) if self.verified.tails else None
 323         # decide best verified head
 324         scores = sorted(self.verified.tails.get(best_tail, []), key=lambda h: (
 325             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 326             #self.verified.shares[h].peer is None,
 327             ht.get_min_height(self.verified.shares[h].previous_block),
 328             -self.verified.shares[h].time_seen
 329         ))
 330
 331
 332         if p2pool.DEBUG:
 333             print len(self.verified.tails), "chain tails and", len(self.verified.tails.get(best_tail, [])), 'chain heads. Top 10 heads:'
 334             if len(scores) > 10:
 335                 print '    ...'
 336             for h in scores[-10:]:
 337                 print '   ', format_hash(h), format_hash(self.verified.shares[h].previous_hash), (
 338                     self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 339                     self.verified.shares[h].peer is None,
 340                     ht.get_min_height(self.verified.shares[h].previous_block),
 341                     -self.verified.shares[h].time_seen
 342                 )
 343
 344         # eat away at heads
 345         if scores:
 346             for i in xrange(1000):
 347                 to_remove = set()
 348                 for share_hash, tail in self.heads.iteritems():
 349                     if share_hash in scores[-5:]:
 350                         #print 1
 351                         continue
 352                     if self.shares[share_hash].time_seen > time.time() - 300:
 353                         #print 2
 354                         continue
 355                     if share_hash not in self.verified.shares and max(self.shares[after_tail_hash].time_seen for after_tail_hash in self.reverse_shares.get(tail)) > time.time() - 120: # XXX stupid
 356                         #print 3
 357                         continue
 358                     to_remove.add(share_hash)
 359                 if not to_remove:
 360                     break
 361                 for share_hash in to_remove:
 362                     self.remove(share_hash)
 363                     if share_hash in self.verified.shares:
 364                         self.verified.remove(share_hash)
 365                 #print "_________", to_remove
 366
 367         # drop tails
 368         for i in xrange(1000):
 369             to_remove = set()
 370             for tail, heads in self.tails.iteritems():
 371                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 372                     continue
 373                 for aftertail in self.reverse_shares.get(tail, set()):
 374                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 375                         print "raw"
 376                         continue
 377                     to_remove.add(aftertail)
 378             if not to_remove:
 379                 break
 380             # if removed from this, it must be removed from verified
 381             #start = time.time()
 382             for aftertail in to_remove:
 383                 if self.shares[aftertail].previous_hash not in self.tails:
 384                     print "erk", aftertail, self.shares[aftertail].previous_hash
 385                     continue
 386                 self.remove(aftertail)
 387                 if aftertail in self.verified.shares:
 388                     self.verified.remove(aftertail)
 389             #end = time.time()
 390             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 391
 392         best = scores[-1] if scores else None
 393
 394         if best is not None:
 395             best_share = self.verified.shares[best]
 396             if ht.get_min_height(best_share.header['previous_block']) < ht.get_min_height(previous_block) and best_share.header_hash != previous_block and best_share.peer is not None:
 397                 if p2pool.DEBUG:
 398                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 399                 best = best_share.previous_hash
 400
 401         return best, desired
 402
 403     @memoize.memoize_with_backing(expiring_dict.ExpiringDict(5, get_touches=False))
 404     def score(self, share_hash, ht):
 405         head_height, last = self.verified.get_height_and_last(share_hash)
 406         score2 = 0
 407         block_height = 0
 408         max_height = min(self.net.CHAIN_LENGTH, head_height)
 409         for share in reversed(list(itertools.islice(self.verified.get_chain_known(self.verified.get_nth_parent_hash(share_hash, max_height//2)), max_height//2))):
 410             block_height = max(block_height, ht.get_min_height(share.header['previous_block']))
 411             this_score = (self.verified.get_work(share_hash) - self.verified.get_work(share.hash))//(ht.get_highest_height() - block_height + 1)
 412             if this_score > score2:
 413                 score2 = this_score
 414         return min(head_height, self.net.CHAIN_LENGTH), score2
 415
 416 def format_hash(x):
 417     if x is None:
 418         return 'xxxxxxxx'
 419     return '%08x' % (x % 2**32)
 420
 421 class ShareStore(object):
 422     def __init__(self, prefix, net):
 423         self.filename = prefix
 424         self.dirname = os.path.dirname(os.path.abspath(prefix))
 425         self.filename = os.path.basename(os.path.abspath(prefix))
 426         self.net = net
 427         self.known = None # will be filename -> set of share hashes, set of verified hashes
 428
 429     def get_shares(self):
 430         if self.known is not None:
 431             raise AssertionError()
 432         known = {}
 433         filenames, next = self.get_filenames_and_next()
 434         for filename in filenames:
 435             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 436             with open(filename, 'rb') as f:
 437                 for line in f:
 438                     try:
 439                         type_id_str, data_hex = line.strip().split(' ')
 440                         type_id = int(type_id_str)
 441                         if type_id == 0:
 442                             pass
 443                         elif type_id == 1:
 444                             pass
 445                         elif type_id == 2:
 446                             verified_hash = int(data_hex, 16)
 447                             yield 'verified_hash', verified_hash
 448                             verified_hashes.add(verified_hash)
 449                         elif type_id == 5:
 450                             share = Share.from_share(share_type.unpack(data_hex.decode('hex')), self.net)
 451                             yield 'share', share
 452                             share_hashes.add(share.hash)
 453                         else:
 454                             raise NotImplementedError("share type %i" % (type_id,))
 455                     except Exception:
 456                         log.err(None, "Error while reading saved shares, continuing where left off:")
 457         self.known = known
 458
 459     def _add_line(self, line):
 460         filenames, next = self.get_filenames_and_next()
 461         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 462             filename = filenames[-1]
 463         else:
 464             filename = next
 465
 466         with open(filename, 'ab') as f:
 467             f.write(line + '\n')
 468
 469         return filename
 470
 471     def add_share(self, share):
 472         type_id, data = 5, share_type.pack(share.as_share())
 473         filename = self._add_line("%i %s" % (type_id, data.encode('hex')))
 474         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 475         share_hashes.add(share.hash)
 476
 477     def add_verified_hash(self, share_hash):
 478         filename = self._add_line("%i %x" % (2, share_hash))
 479         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 480         verified_hashes.add(share_hash)
 481
 482     def get_filenames_and_next(self):
 483         suffixes = sorted(int(x[len(self.filename):]) for x in os.listdir(self.dirname) if x.startswith(self.filename) and x[len(self.filename):].isdigit())
 484         return [os.path.join(self.dirname, self.filename + str(suffix)) for suffix in suffixes], os.path.join(self.dirname, self.filename + (str(suffixes[-1] + 1) if suffixes else str(0)))
 485
 486     def forget_share(self, share_hash):
 487         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 488             if share_hash in share_hashes:
 489                 share_hashes.remove(share_hash)
 490         self.check_remove()
 491
 492     def forget_verified_share(self, share_hash):
 493         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 494             if share_hash in verified_hashes:
 495                 verified_hashes.remove(share_hash)
 496         self.check_remove()
 497
 498     def check_remove(self):
 499         to_remove = set()
 500         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 501             #print filename, len(share_hashes) + len(verified_hashes)
 502             if not share_hashes and not verified_hashes:
 503                 to_remove.add(filename)
 504         for filename in to_remove:
 505             self.known.pop(filename)
 506             os.remove(filename)
 507             print "REMOVED", filename