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, namecoin, ixcoin, i0coin, solidcoin, litecoin
  13 from p2pool.util import memoize, expiring_dict, math
  14
  15
  16 merkle_branch_type = bitcoin_data.ListType(bitcoin_data.ComposedType([
  17     ('side', bitcoin_data.StructType('<B')), # enum?
  18     ('hash', bitcoin_data.HashType()),
  19 ]))
  20
  21
  22 share_data_type = bitcoin_data.ComposedType([
  23     ('previous_share_hash', bitcoin_data.PossiblyNoneType(0, bitcoin_data.HashType())),
  24     ('target', bitcoin_data.FloatingIntegerType()),
  25     ('nonce', bitcoin_data.VarStrType()),
  26 ])
  27
  28
  29 coinbase_type = bitcoin_data.ComposedType([
  30     ('identifier', bitcoin_data.FixedStrType(8)),
  31     ('share_data', share_data_type),
  32 ])
  33
  34 share_info_type = bitcoin_data.ComposedType([
  35     ('share_data', share_data_type),
  36     ('new_script', bitcoin_data.VarStrType()),
  37     ('subsidy', bitcoin_data.StructType('<Q')),
  38 ])
  39
  40
  41 share1a_type = bitcoin_data.ComposedType([
  42     ('header', bitcoin_data.block_header_type),
  43     ('share_info', share_info_type),
  44     ('merkle_branch', merkle_branch_type),
  45 ])
  46
  47 share1b_type = bitcoin_data.ComposedType([
  48     ('header', bitcoin_data.block_header_type),
  49     ('share_info', share_info_type),
  50     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  51 ])
  52
  53 new_share_data_type = bitcoin_data.ComposedType([
  54     ('previous_share_hash', bitcoin_data.PossiblyNoneType(0, bitcoin_data.HashType())),
  55     ('pre_coinbase', bitcoin_data.VarStrType()),
  56     ('post_coinbase', bitcoin_data.VarStrType()),
  57     ('nonce', bitcoin_data.VarStrType()),
  58     ('new_script', bitcoin_data.VarStrType()),
  59     ('subsidy', bitcoin_data.StructType('<Q')),
  60     ('donation', bitcoin_data.StructType('<H')),
  61 ])
  62
  63 new_share_info_type = bitcoin_data.ComposedType([
  64     ('new_share_data', new_share_data_type),
  65     ('target', bitcoin_data.FloatingIntegerType()),
  66 ])
  67
  68 new_share1a_type = bitcoin_data.ComposedType([
  69     ('header', bitcoin_data.block_header_type),
  70     ('share_info', new_share_info_type),
  71     ('merkle_branch', merkle_branch_type),
  72 ])
  73
  74 new_share1b_type = bitcoin_data.ComposedType([
  75     ('header', bitcoin_data.block_header_type),
  76     ('share_info', new_share_info_type),
  77     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  78 ])
  79
  80 def calculate_merkle_branch(txs, index):
  81     hash_list = [(bitcoin_data.tx_type.hash256(tx), i == index, []) for i, tx in enumerate(txs)]
  82
  83     while len(hash_list) > 1:
  84         hash_list = [
  85             (
  86                 bitcoin_data.merkle_record_type.hash256(dict(left=left, right=right)),
  87                 left_f or right_f,
  88                 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
  89             )
  90             for (left, left_f, left_l), (right, right_f, right_l) in
  91                 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
  92         ]
  93
  94     assert hash_list[0][1]
  95     assert check_merkle_branch(txs[index], hash_list[0][2]) == hash_list[0][0]
  96
  97     return hash_list[0][2]
  98
  99 def check_merkle_branch(tx, branch):
 100     hash_ = bitcoin_data.tx_type.hash256(tx)
 101     for step in branch:
 102         if not step['side']:
 103             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=step['hash'], right=hash_))
 104         else:
 105             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=hash_, right=step['hash']))
 106     return hash_
 107
 108 def share_info_to_gentx(share_info, block_target, tracker, net):
 109     return generate_transaction(
 110         tracker=tracker,
 111         previous_share_hash=share_info['share_data']['previous_share_hash'],
 112         new_script=share_info['new_script'],
 113         subsidy=share_info['subsidy'],
 114         nonce=share_info['share_data']['nonce'],
 115         block_target=block_target,
 116         net=net,
 117     )
 118
 119 class Share(object):
 120     @classmethod
 121     def from_block(cls, block, net):
 122         return cls(net, block['header'], gentx_to_share_info(block['txs'][0]), other_txs=block['txs'][1:])
 123
 124     @classmethod
 125     def from_share1a(cls, share1a, net):
 126         return cls(net, **share1a)
 127
 128     @classmethod
 129     def from_share1b(cls, share1b, net):
 130         return cls(net, **share1b)
 131
 132     __slots__ = 'header previous_block share_info merkle_branch other_txs timestamp share_data new_script subsidy previous_hash previous_share_hash target nonce bitcoin_hash hash time_seen shared stored peer'.split(' ')
 133
 134     def __init__(self, net, header, share_info, merkle_branch=None, other_txs=None):
 135         if merkle_branch is None and other_txs is None:
 136             raise ValueError('need either merkle_branch or other_txs')
 137         if other_txs is not None:
 138             new_merkle_branch = calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
 139             if merkle_branch is not None:
 140                 if merke_branch != new_merkle_branch:
 141                     raise ValueError('invalid merkle_branch and other_txs')
 142             merkle_branch = new_merkle_branch
 143
 144         if len(merkle_branch) > 16:
 145             raise ValueError('merkle_branch too long!')
 146
 147         self.header = header
 148         self.previous_block = header['previous_block']
 149         self.share_info = share_info
 150         self.merkle_branch = merkle_branch
 151         self.other_txs = other_txs
 152
 153         self.timestamp = self.header['timestamp']
 154
 155         self.share_data = self.share_info['share_data']
 156         self.new_script = self.share_info['new_script']
 157         self.subsidy = self.share_info['subsidy']
 158
 159         if len(self.new_script) > 100:
 160             raise ValueError('new_script too long!')
 161
 162         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 163         self.target = self.share_data['target']
 164         self.nonce = self.share_data['nonce']
 165
 166         if len(self.nonce) > 100:
 167             raise ValueError('nonce too long!')
 168
 169         # use scrypt for Litecoin
 170         if (getattr(net, 'BITCOIN_POW_SCRYPT', False)):
 171             self.bitcoin_hash = bitcoin_data.block_header_type.scrypt(header)
 172             self.hash = share1a_type.scrypt(self.as_share1a())
 173         else:
 174             self.bitcoin_hash = bitcoin_data.block_header_type.hash256(header)
 175             self.hash = share1a_type.hash256(self.as_share1a())
 176
 177         if self.bitcoin_hash > self.target:
 178             print 'hash %x' % self.bitcoin_hash
 179             print 'targ %x' % self.target
 180             raise ValueError('not enough work!')
 181
 182         if script.get_sigop_count(self.new_script) > 1:
 183             raise ValueError('too many sigops!')
 184
 185         # XXX eww
 186         self.time_seen = time.time()
 187         self.shared = False
 188         self.stored = False
 189         self.peer = None
 190
 191     def as_block(self, tracker, net):
 192         if self.other_txs is None:
 193             raise ValueError('share does not contain all txs')
 194
 195         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 196
 197         return dict(header=self.header, txs=[gentx] + self.other_txs)
 198
 199     def as_share1a(self):
 200         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 201
 202     def as_share1b(self):
 203         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 204
 205     def check(self, tracker, now, net):
 206         import time
 207         if self.previous_share_hash is not None:
 208             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):
 209                 raise ValueError('share from too far in the past!')
 210
 211         if self.header['timestamp'] > now + 2*60*60:
 212             raise ValueError('share from too far in the future!')
 213
 214         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 215
 216         if len(gentx['tx_ins'][0]['script']) > 100:
 217             raise ValueError('''coinbase too large! %i bytes''' % (len(gentx['tx_ins'][0]['script']),))
 218
 219         if check_merkle_branch(gentx, self.merkle_branch) != self.header['merkle_root']:
 220             raise ValueError('''gentx doesn't match header via merkle_branch''')
 221
 222         if self.other_txs is not None:
 223             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 224                 raise ValueError('''gentx doesn't match header via other_txs''')
 225
 226             if len(bitcoin_data.block_type.pack(dict(header=self.header, txs=[gentx] + self.other_txs))) > 1000000 - 1000:
 227                 raise ValueError('''block size too large''')
 228
 229     def flag_shared(self):
 230         self.shared = True
 231
 232     def __repr__(self):
 233         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 234
 235 def get_pool_attempts_per_second(tracker, previous_share_hash, net, dist=None):
 236     if dist is None:
 237         dist = net.TARGET_LOOKBEHIND
 238     near = tracker.shares[previous_share_hash]
 239     far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 240     attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
 241     time = near.timestamp - far.timestamp
 242     if time == 0:
 243         time = 1
 244     return attempts//time
 245
 246 def generate_transaction(tracker, previous_share_hash, new_script, subsidy, nonce, block_target, net):
 247     height, last = tracker.get_height_and_last(previous_share_hash)
 248     assert height >= net.CHAIN_LENGTH or last is None
 249     if height < net.TARGET_LOOKBEHIND:
 250         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 251     else:
 252         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net)
 253         previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 254         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 255         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 256         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 257         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 258
 259     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 260     max_weight = net.SPREAD * attempts_to_block
 261
 262     this_weight = min(bitcoin_data.target_to_average_attempts(target), max_weight)
 263     other_weights, other_weights_total = tracker.get_cumulative_weights(previous_share_hash, min(height, net.CHAIN_LENGTH), max(0, max_weight - this_weight))
 264     dest_weights, total_weight = math.add_dicts([{new_script: this_weight}, other_weights]), this_weight + other_weights_total
 265     assert total_weight == sum(dest_weights.itervalues())
 266
 267     if net.SCRIPT:
 268         amounts = dict((script, subsidy*(396*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 269         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 270         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*2//400
 271         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 272     else:
 273         amounts = dict((script, subsidy*(398*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 274         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 275         amounts[new_script] = amounts.get(new_script, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 276
 277     if sum(amounts.itervalues()) != subsidy:
 278         raise ValueError()
 279     if any(x < 0 for x in amounts.itervalues()):
 280         raise ValueError()
 281
 282     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 283     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 284
 285     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 286     assert dests[-1] == new_script
 287
 288     return dict(
 289         version=1,
 290         tx_ins=[dict(
 291             previous_output=None,
 292             sequence=None,
 293             script=coinbase_type.pack(dict(
 294                 identifier=net.IDENTIFIER,
 295                 share_data=dict(
 296                     previous_share_hash=previous_share_hash,
 297                     nonce=nonce,
 298                     target=target,
 299                 ),
 300             )),
 301         )],
 302         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 303         lock_time=0,
 304     )
 305
 306 def new_generate_transaction(tracker, new_share_data, block_target, net):
 307     previous_share_hash = new_share_data['previous_share_hash']
 308     new_script = new_share_data['new_script']
 309     subsidy = new_share_data['subsidy']
 310
 311     height, last = tracker.get_height_and_last(previous_share_hash)
 312     assert height >= net.CHAIN_LENGTH or last is None
 313     if height < net.TARGET_LOOKBEHIND:
 314         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 315     else:
 316         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net)
 317         previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 318         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 319         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 320         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 321         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 322
 323     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 324     max_weight = net.SPREAD * attempts_to_block
 325
 326     this_weight = min(bitcoin_data.target_to_average_attempts(target), max_weight)
 327     other_weights, other_weights_total = tracker.get_cumulative_weights(previous_share_hash, min(height, net.CHAIN_LENGTH), max(0, max_weight - this_weight))
 328     dest_weights, total_weight = math.add_dicts([{new_script: this_weight}, other_weights]), this_weight + other_weights_total
 329     assert total_weight == sum(dest_weights.itervalues())
 330
 331     amounts = dict((script, subsidy*(396*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 332     amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 333     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*2//400
 334     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 335
 336     if sum(amounts.itervalues()) != subsidy:
 337         raise ValueError()
 338     if any(x < 0 for x in amounts.itervalues()):
 339         raise ValueError()
 340
 341     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 342     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 343
 344     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 345     assert dests[-1] == new_script
 346
 347     return dict(
 348         version=1,
 349         tx_ins=[dict(
 350             previous_output=None,
 351             sequence=None,
 352             script=new_share_data['coinbase_pre'] + new_share_data_type.hash256(dict(
 353                 new_share_data=new_share_data,
 354                 target=target,
 355             )) + new_share_data['coinbase_post'],
 356         )],
 357         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 358         lock_time=0,
 359     )
 360
 361
 362 class OkayTracker(bitcoin_data.Tracker):
 363     def __init__(self, net):
 364         bitcoin_data.Tracker.__init__(self)
 365         self.net = net
 366         self.verified = bitcoin_data.Tracker()
 367         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 368
 369         self.get_cumulative_weights = skiplists.WeightsSkipList(self)
 370
 371     def add(self, share, known_verified=False):
 372         bitcoin_data.Tracker.add(self, share)
 373         if known_verified:
 374             self.verified.add(share)
 375
 376     def attempt_verify(self, share, now):
 377         if share.hash in self.verified.shares:
 378             return True
 379         height, last = self.get_height_and_last(share.hash)
 380         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 381             raise AssertionError()
 382         try:
 383             share.check(self, now, self.net)
 384         except:
 385             log.err(None, 'Share check failed:')
 386             return False
 387         else:
 388             self.verified.add(share)
 389             return True
 390
 391     def think(self, ht, previous_block, now):
 392         desired = set()
 393
 394         # O(len(self.heads))
 395         #   make 'unverified heads' set?
 396         # for each overall head, attempt verification
 397         # if it fails, attempt on parent, and repeat
 398         # if no successful verification because of lack of parents, request parent
 399         bads = set()
 400         for head in set(self.heads) - set(self.verified.heads):
 401             head_height, last = self.get_height_and_last(head)
 402
 403             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))):
 404                 if self.attempt_verify(share, now):
 405                     break
 406                 if share.hash in self.heads:
 407                     bads.add(share.hash)
 408             else:
 409                 if last is not None:
 410                     desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 411         for bad in bads:
 412             assert bad not in self.verified.shares
 413             assert bad in self.heads
 414             if p2pool.DEBUG:
 415                 print "BAD", bad
 416             self.remove(bad)
 417
 418         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 419         for head in list(self.verified.heads):
 420             head_height, last_hash = self.verified.get_height_and_last(head)
 421             last_height, last_last_hash = self.get_height_and_last(last_hash)
 422             # XXX review boundary conditions
 423             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 424             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 425             get = min(want, can)
 426             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 427             for share in itertools.islice(self.get_chain_known(last_hash), get):
 428                 if not self.attempt_verify(share, now):
 429                     break
 430             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 431                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer, last_last_hash))
 432
 433         # decide best tree
 434         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
 435         # decide best verified head
 436         scores = sorted(self.verified.tails.get(best_tail, []), key=lambda h: (
 437             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 438             #self.verified.shares[h].peer is None,
 439             ht.get_min_height(self.verified.shares[h].previous_block),
 440             -self.verified.shares[h].time_seen
 441         ))
 442
 443
 444         if p2pool.DEBUG:
 445             print len(self.verified.tails), "chain tails and", len(self.verified.tails.get(best_tail, [])), 'chain heads. Top 10 tails:'
 446             if len(scores) > 10:
 447                 print '    ...'
 448             for h in scores[-10:]:
 449                 print '   ', format_hash(h), format_hash(self.verified.shares[h].previous_hash), (
 450                     self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 451                     self.verified.shares[h].peer is None,
 452                     ht.get_min_height(self.verified.shares[h].previous_block),
 453                     -self.verified.shares[h].time_seen
 454                 )
 455
 456         # eat away at heads
 457         if scores:
 458             for i in xrange(1000):
 459                 to_remove = set()
 460                 for share_hash, tail in self.heads.iteritems():
 461                     if share_hash in scores[-5:]:
 462                         #print 1
 463                         continue
 464                     if self.shares[share_hash].time_seen > time.time() - 300:
 465                         #print 2
 466                         continue
 467                     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
 468                         #print 3
 469                         continue
 470                     to_remove.add(share_hash)
 471                 if not to_remove:
 472                     break
 473                 for share_hash in to_remove:
 474                     self.remove(share_hash)
 475                     if share_hash in self.verified.shares:
 476                         self.verified.remove(share_hash)
 477                 #print "_________", to_remove
 478
 479         # drop tails
 480         for i in xrange(1000):
 481             to_remove = set()
 482             for tail, heads in self.tails.iteritems():
 483                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 484                     continue
 485                 for aftertail in self.reverse_shares.get(tail, set()):
 486                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 487                         print "raw"
 488                         continue
 489                     to_remove.add(aftertail)
 490             if not to_remove:
 491                 break
 492             # if removed from this, it must be removed from verified
 493             #start = time.time()
 494             for aftertail in to_remove:
 495                 if self.shares[aftertail].previous_hash not in self.tails:
 496                     print "erk", aftertail, self.shares[aftertail].previous_hash
 497                     continue
 498                 self.remove(aftertail)
 499                 if aftertail in self.verified.shares:
 500                     self.verified.remove(aftertail)
 501             #end = time.time()
 502             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 503
 504         best = scores[-1] if scores else None
 505
 506         if best is not None:
 507             best_share = self.verified.shares[best]
 508             if ht.get_min_height(best_share.header['previous_block']) < ht.get_min_height(previous_block) and best_share.bitcoin_hash != previous_block and best_share.peer is not None:
 509                 if p2pool.DEBUG:
 510                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 511                 best = best_share.previous_hash
 512
 513         return best, desired
 514
 515     @memoize.memoize_with_backing(expiring_dict.ExpiringDict(5, get_touches=False))
 516     def score(self, share_hash, ht):
 517         head_height, last = self.verified.get_height_and_last(share_hash)
 518         score2 = 0
 519         attempts = 0
 520         max_height = 0
 521         share2_hash = self.verified.get_nth_parent_hash(share_hash, min(self.net.CHAIN_LENGTH//2, head_height//2)) if last is not None else share_hash
 522         for share in reversed(list(itertools.islice(self.verified.get_chain_known(share2_hash), self.net.CHAIN_LENGTH))):
 523             max_height = max(max_height, ht.get_min_height(share.header['previous_block']))
 524             attempts += bitcoin_data.target_to_average_attempts(share.target)
 525             this_score = attempts//(ht.get_highest_height() - max_height + 1)
 526             if this_score > score2:
 527                 score2 = this_score
 528         return min(head_height, self.net.CHAIN_LENGTH), score2
 529
 530 def format_hash(x):
 531     if x is None:
 532         return 'xxxxxxxx'
 533     return '%08x' % (x % 2**32)
 534
 535 class ShareStore(object):
 536     def __init__(self, prefix, net):
 537         self.filename = prefix
 538         self.net = net
 539         self.known = None # will be filename -> set of share hashes, set of verified hashes
 540
 541     def get_shares(self):
 542         if self.known is not None:
 543             raise AssertionError()
 544         known = {}
 545         filenames, next = self.get_filenames_and_next()
 546         for filename in filenames:
 547             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 548             with open(filename, 'rb') as f:
 549                 for line in f:
 550                     try:
 551                         type_id_str, data_hex = line.strip().split(' ')
 552                         type_id = int(type_id_str)
 553                         if type_id == 0:
 554                             share = Share.from_share1a(share1a_type.unpack(data_hex.decode('hex')), self.net)
 555                             yield 'share', share
 556                             share_hashes.add(share.hash)
 557                         elif type_id == 1:
 558                             share = Share.from_share1b(share1b_type.unpack(data_hex.decode('hex')), self.net)
 559                             yield 'share', share
 560                             share_hashes.add(share.hash)
 561                         elif type_id == 2:
 562                             verified_hash = int(data_hex, 16)
 563                             yield 'verified_hash', verified_hash
 564                             verified_hashes.add(verified_hash)
 565                         else:
 566                             raise NotImplementedError("share type %i" % (type_id,))
 567                     except Exception:
 568                         log.err(None, "Error while reading saved shares, continuing where left off:")
 569         self.known = known
 570
 571     def _add_line(self, line):
 572         filenames, next = self.get_filenames_and_next()
 573         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 574             filename = filenames[-1]
 575         else:
 576             filename = next
 577
 578         with open(filename, 'ab') as f:
 579             f.write(line + '\n')
 580
 581         return filename
 582
 583     def add_share(self, share):
 584         if share.bitcoin_hash <= share.header['target']:
 585             type_id, data = 1, share1b_type.pack(share.as_share1b())
 586         else:
 587             type_id, data = 0, share1a_type.pack(share.as_share1a())
 588         filename = self._add_line("%i %s" % (type_id, data.encode('hex')))
 589         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 590         share_hashes.add(share.hash)
 591
 592     def add_verified_hash(self, share_hash):
 593         filename = self._add_line("%i %x" % (2, share_hash))
 594         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 595         verified_hashes.add(share_hash)
 596
 597     def get_filenames_and_next(self):
 598         suffixes = sorted(int(x[len(self.filename):]) for x in os.listdir('.') if x.startswith(self.filename) and x[len(self.filename):].isdigit())
 599         return [self.filename + str(suffix) for suffix in suffixes], self.filename + str(suffixes[-1] + 1) if suffixes else self.filename + str(0)
 600
 601     def forget_share(self, share_hash):
 602         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 603             if share_hash in share_hashes:
 604                 share_hashes.remove(share_hash)
 605         self.check_remove()
 606
 607     def forget_verified_share(self, share_hash):
 608         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 609             if share_hash in verified_hashes:
 610                 verified_hashes.remove(share_hash)
 611         self.check_remove()
 612
 613     def check_remove(self):
 614         to_remove = set()
 615         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 616             #print filename, len(share_hashes) + len(verified_hashes)
 617             if not share_hashes and not verified_hashes:
 618                 to_remove.add(filename)
 619         for filename in to_remove:
 620             self.known.pop(filename)
 621             os.remove(filename)
 622             print "REMOVED", filename
 623
 624 class BitcoinMainnet(bitcoin_data.Mainnet):
 625     SHARE_PERIOD = 10 # seconds
 626     CHAIN_LENGTH = 24*60*60//5 # shares
 627     TARGET_LOOKBEHIND = 200 # shares
 628     SPREAD = 3 # blocks
 629     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 630     IDENTIFIER = 'fc70035c7a81bc6f'.decode('hex')
 631     PREFIX = '2472ef181efcd37b'.decode('hex')
 632     NAME = 'bitcoin'
 633     P2P_PORT = 9333
 634     MAX_TARGET = 2**256//2**32 - 1
 635     PERSIST = True
 636     WORKER_PORT = 9332
 637
 638 class BitcoinTestnet(bitcoin_data.Testnet):
 639     SHARE_PERIOD = 1 # seconds
 640     CHAIN_LENGTH = 24*60*60//5 # shares
 641     TARGET_LOOKBEHIND = 200 # shares
 642     SPREAD = 3 # blocks
 643     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 644     IDENTIFIER = '5fc2be2d4f0d6bfb'.decode('hex')
 645     PREFIX = '3f6057a15036f441'.decode('hex')
 646     NAME = 'bitcoin_testnet'
 647     P2P_PORT = 19333
 648     MAX_TARGET = 2**256//2**32 - 1
 649     PERSIST = False
 650     WORKER_PORT = 19332
 651
 652 class NamecoinMainnet(namecoin.Mainnet):
 653     SHARE_PERIOD = 10 # seconds
 654     CHAIN_LENGTH = 24*60*60//10 # shares
 655     TARGET_LOOKBEHIND = 3600//10 # shares
 656     SPREAD = 3 # blocks
 657     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 658     IDENTIFIER = 'd5b1192062c4c454'.decode('hex')
 659     PREFIX = 'b56f3d0fb24fc982'.decode('hex')
 660     NAME = 'namecoin'
 661     P2P_PORT = 9334
 662     MAX_TARGET = 2**256//2**32 - 1
 663     PERSIST = True
 664     WORKER_PORT = 9331
 665
 666 class NamecoinTestnet(namecoin.Testnet):
 667     SHARE_PERIOD = 1 # seconds
 668     CHAIN_LENGTH = 24*60*60//5 # shares
 669     TARGET_LOOKBEHIND = 200 # shares
 670     SPREAD = 3 # blocks
 671     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 672     IDENTIFIER = '8dd303d014a01a60'.decode('hex')
 673     PREFIX = '4d6581d24f51acbf'.decode('hex')
 674     NAME = 'namecoin_testnet'
 675     P2P_PORT = 19334
 676     MAX_TARGET = 2**256//2**20 - 1
 677     PERSIST = False
 678     WORKER_PORT = 19331
 679
 680 class IxcoinMainnet(ixcoin.Mainnet):
 681     SHARE_PERIOD = 10 # seconds
 682     CHAIN_LENGTH = 24*60*60//10 # shares
 683     TARGET_LOOKBEHIND = 3600//10 # shares
 684     SPREAD = 3 # blocks
 685     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 686     IDENTIFIER = '27b564116e2a2666'.decode('hex')
 687     PREFIX = '9dd6c4a619401f2f'.decode('hex')
 688     NAME = 'ixcoin'
 689     P2P_PORT = 9335
 690     MAX_TARGET = 2**256//2**32 - 1
 691     PERSIST = True
 692     WORKER_PORT = 9330
 693
 694 class IxcoinTestnet(ixcoin.Testnet):
 695     SHARE_PERIOD = 1 # seconds
 696     CHAIN_LENGTH = 24*60*60//5 # shares
 697     TARGET_LOOKBEHIND = 200 # shares
 698     SPREAD = 3 # blocks
 699     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 700     IDENTIFIER = '7430cbeb01249e44'.decode('hex')
 701     PREFIX = '7cfffda946709c1f'.decode('hex')
 702     NAME = 'ixcoin_testnet'
 703     P2P_PORT = 19335
 704     MAX_TARGET = 2**256//2**20 - 1
 705     PERSIST = False
 706     WORKER_PORT = 19330
 707
 708 class I0coinMainnet(i0coin.Mainnet):
 709     SHARE_PERIOD = 10 # seconds
 710     CHAIN_LENGTH = 24*60*60//10 # shares
 711     TARGET_LOOKBEHIND = 3600//10 # shares
 712     SPREAD = 3 # blocks
 713     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 714     IDENTIFIER = 'b32e3f10c2ff221b'.decode('hex')
 715     PREFIX = '6155537ed977a3b5'.decode('hex')
 716     NAME = 'i0coin'
 717     P2P_PORT = 9336
 718     MAX_TARGET = 2**256//2**32 - 1
 719     PERSIST = False
 720     WORKER_PORT = 9329
 721
 722 class I0coinTestnet(i0coin.Testnet):
 723     SHARE_PERIOD = 1 # seconds
 724     CHAIN_LENGTH = 24*60*60//5 # shares
 725     TARGET_LOOKBEHIND = 200 # shares
 726     SPREAD = 3 # blocks
 727     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 728     IDENTIFIER = '7712c1a8181b5f2e'.decode('hex')
 729     PREFIX = '792d2e7d770fbe68'.decode('hex')
 730     NAME = 'i0coin_testnet'
 731     P2P_PORT = 19336
 732     MAX_TARGET = 2**256//2**20 - 1
 733     PERSIST = False
 734     WORKER_PORT = 19329
 735
 736 class SolidcoinMainnet(solidcoin.Mainnet):
 737     SHARE_PERIOD = 10
 738     CHAIN_LENGTH = 24*60*60//10 # shares
 739     TARGET_LOOKBEHIND = 3600//10 # shares
 740     SPREAD = 3 # blocks
 741     SCRIPT = bitcoin_data.pubkey_hash_to_script2(bitcoin_data.address_to_pubkey_hash('sMKZ1yxHETxPYKh4Z2anWnwZDJZU7ztroy', solidcoin.Mainnet))
 742     IDENTIFIER = '9cc9c421cca258cd'.decode('hex')
 743     PREFIX = 'c059125b8070f00a'.decode('hex')
 744     NAME = 'solidcoin'
 745     P2P_PORT = 9337
 746     MAX_TARGET = 2**256//2**32 - 1
 747     PERSIST = True
 748     WORKER_PORT = 9328
 749
 750 class LitecoinMainnet(litecoin.Mainnet):
 751     SHARE_PERIOD = 10 # seconds
 752     CHAIN_LENGTH = 24*60*60//5 # shares
 753     TARGET_LOOKBEHIND = 200 # shares
 754     SPREAD = 12 # blocks
 755     SCRIPT = None # no fee
 756     IDENTIFIER = 'e037d5b8c6923410'.decode('hex')
 757     PREFIX = '7208c1a53ef629b0'.decode('hex')
 758     NAME = 'litecoin'
 759     P2P_PORT = 9338
 760     MAX_TARGET = 2**256//2**20 - 1
 761     PERSIST = True
 762     WORKER_PORT = 9327
 763
 764 class LitecoinTestnet(litecoin.Testnet):
 765     SHARE_PERIOD = 1 # seconds
 766     CHAIN_LENGTH = 24*60*60//5 # shares
 767     TARGET_LOOKBEHIND = 200 # shares
 768     SPREAD = 12 # blocks
 769     SCRIPT = None # no fee
 770     IDENTIFIER = 'cca5e24ec6408b1e'.decode('hex')
 771     PREFIX = 'ad9614f6466a39cf'.decode('hex')
 772     NAME = 'litecoin_testnet'
 773     P2P_PORT = 19338
 774     MAX_TARGET = 2**256//2**17 - 1
 775     PERSIST = False
 776     WORKER_PORT = 19327
 777
 778 nets = dict((net.NAME, net) for net in set([BitcoinMainnet, BitcoinTestnet, NamecoinMainnet, NamecoinTestnet, IxcoinMainnet, IxcoinTestnet, I0coinMainnet, I0coinTestnet, SolidcoinMainnet, LitecoinMainnet, LitecoinTestnet]))