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, networks
  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     ('coinbase', bitcoin_data.VarStrType()),
  56     ('nonce', bitcoin_data.VarStrType()),
  57     ('new_script', bitcoin_data.VarStrType()),
  58     ('subsidy', bitcoin_data.StructType('<Q')),
  59     ('donation', bitcoin_data.StructType('<H')),
  60     ('timestamp', bitcoin_data.StructType('<I')),
  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', bitcoin_data.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 # type:
  81 # 0: new_share1a
  82 # 1: new_share1b
  83
  84 new_share_type = bitcoin_data.ComposedType([
  85     ('type', bitcoin_data.VarIntType()),
  86     ('contents', bitcoin_data.VarStrType()),
  87 ])
  88
  89 def calculate_merkle_branch(txs, index):
  90     hash_list = [(bitcoin_data.tx_type.hash256(tx), i == index, []) for i, tx in enumerate(txs)]
  91
  92     while len(hash_list) > 1:
  93         hash_list = [
  94             (
  95                 bitcoin_data.merkle_record_type.hash256(dict(left=left, right=right)),
  96                 left_f or right_f,
  97                 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
  98             )
  99             for (left, left_f, left_l), (right, right_f, right_l) in
 100                 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
 101         ]
 102
 103     assert hash_list[0][1]
 104     assert check_merkle_branch(txs[index], hash_list[0][2]) == hash_list[0][0]
 105
 106     return hash_list[0][2]
 107
 108 def check_merkle_branch(tx, branch):
 109     hash_ = bitcoin_data.tx_type.hash256(tx)
 110     for step in branch:
 111         if not step['side']:
 112             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=step['hash'], right=hash_))
 113         else:
 114             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=hash_, right=step['hash']))
 115     return hash_
 116
 117 def share_info_to_gentx(share_info, block_target, tracker, net):
 118     return generate_transaction(
 119         tracker=tracker,
 120         previous_share_hash=share_info['share_data']['previous_share_hash'],
 121         new_script=share_info['new_script'],
 122         subsidy=share_info['subsidy'],
 123         nonce=share_info['share_data']['nonce'],
 124         block_target=block_target,
 125         net=net,
 126     )[1]
 127
 128 class Share(object):
 129     donation = 0
 130
 131     @classmethod
 132     def from_share1a(cls, share1a, net):
 133         return cls(net, **share1a)
 134
 135     @classmethod
 136     def from_share1b(cls, share1b, net):
 137         return cls(net, **share1b)
 138
 139     __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 shared stored peer'.split(' ')
 140
 141     def __init__(self, net, header, share_info, merkle_branch=None, other_txs=None):
 142         if merkle_branch is None and other_txs is None:
 143             raise ValueError('need either merkle_branch or other_txs')
 144         if other_txs is not None:
 145             new_merkle_branch = calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
 146             if merkle_branch is not None:
 147                 if merke_branch != new_merkle_branch:
 148                     raise ValueError('invalid merkle_branch and other_txs')
 149             merkle_branch = new_merkle_branch
 150
 151         if len(merkle_branch) > 16:
 152             raise ValueError('merkle_branch too long!')
 153
 154         self.header = header
 155         self.previous_block = header['previous_block']
 156         self.share_info = share_info
 157         self.merkle_branch = merkle_branch
 158         self.other_txs = other_txs
 159
 160         self.timestamp = self.header['timestamp']
 161
 162         self.share_data = self.share_info['share_data']
 163         self.new_script = self.share_info['new_script']
 164         self.subsidy = self.share_info['subsidy']
 165
 166         if len(self.new_script) > 100:
 167             raise ValueError('new_script too long!')
 168
 169         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 170         self.target = self.share_data['target']
 171         self.nonce = self.share_data['nonce']
 172
 173         if len(self.nonce) > 100:
 174             raise ValueError('nonce too long!')
 175
 176         self.pow_hash = net.BITCOIN_POW_FUNC(header)
 177         self.header_hash = bitcoin_data.block_header_type.hash256(header)
 178
 179         if net.BITCOIN_POW_FUNC is bitcoin_data.block_header_type.scrypt:
 180             # compatibility hack
 181             self.hash = share1a_type.scrypt(self.as_share1a())
 182         else:
 183             self.hash = share1a_type.hash256(self.as_share1a())
 184
 185         if self.pow_hash > self.target:
 186             print 'hash %x' % self.pow_hash
 187             print 'targ %x' % self.target
 188             raise ValueError('not enough work!')
 189
 190         if script.get_sigop_count(self.new_script) > 1:
 191             raise ValueError('too many sigops!')
 192
 193         # XXX eww
 194         self.time_seen = time.time()
 195         self.shared = False
 196         self.stored = False
 197         self.peer = None
 198
 199     def as_block(self, tracker, net):
 200         if self.other_txs is None:
 201             raise ValueError('share does not contain all txs')
 202
 203         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 204
 205         return dict(header=self.header, txs=[gentx] + self.other_txs)
 206
 207     def as_share1a(self):
 208         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 209
 210     def as_share1b(self):
 211         if self.other_txs is None:
 212             raise ValueError('share does not contain all txs')
 213
 214         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 215
 216     def check(self, tracker, now, net):
 217         import time
 218         if self.previous_share_hash is not None:
 219             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):
 220                 raise ValueError('share from too far in the past!')
 221
 222         if self.header['timestamp'] > now + 2*60*60:
 223             raise ValueError('share from too far in the future!')
 224
 225         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 226
 227         if len(gentx['tx_ins'][0]['script']) > 100:
 228             raise ValueError('coinbase too large! %i bytes' % (len(gentx['tx_ins'][0]['script']),))
 229
 230         if check_merkle_branch(gentx, self.merkle_branch) != self.header['merkle_root']:
 231             raise ValueError('''gentx doesn't match header via merkle_branch''')
 232
 233         if self.other_txs is not None:
 234             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 235                 raise ValueError('''gentx doesn't match header via other_txs''')
 236
 237             if len(bitcoin_data.block_type.pack(dict(header=self.header, txs=[gentx] + self.other_txs))) > 1000000 - 1000:
 238                 raise ValueError('block size too large')
 239
 240     def flag_shared(self):
 241         self.shared = True
 242
 243     def __repr__(self):
 244         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 245
 246 class NewShare(Share):
 247     @classmethod
 248     def from_share(cls, share, net):
 249         if share['type'] == 0:
 250             res = cls.from_share1a(new_share1a_type.unpack(share['contents']), net)
 251             if not (res.pow_hash > res.header['target']):
 252                 raise ValueError('invalid share type')
 253             return res
 254         elif share['type'] == 1:
 255             res = cls.from_share1b(new_share1b_type.unpack(share['contents']), net)
 256             if not (res.pow_hash <= res.header['target']):
 257                 raise ValueError('invalid share type')
 258             return res
 259         else:
 260             raise ValueError('unknown share type: %r' % (share['type'],))
 261
 262     def as_share(self):
 263         if self.pow_hash > self.header['target']: # new_share1a
 264             return dict(type=0, contents=new_share1a_type.pack(self.as_share1a()))
 265         elif self.pow_hash <= self.header['target']: # new_share1b
 266             return dict(type=1, contents=new_share1b_type.pack(self.as_share1b()))
 267         else:
 268             raise AssertionError()
 269
 270     def __init__(self, net, header, new_share_info, merkle_branch=None, other_txs=None):
 271         if merkle_branch is None and other_txs is None:
 272             raise ValueError('need either merkle_branch or other_txs')
 273         if other_txs is not None:
 274             new_merkle_branch = bitcoin_data.calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
 275             if merkle_branch is not None:
 276                 if merke_branch != new_merkle_branch:
 277                     raise ValueError('invalid merkle_branch and other_txs')
 278             merkle_branch = new_merkle_branch
 279
 280         if len(merkle_branch) > 16:
 281             raise ValueError('merkle_branch too long!')
 282
 283         self.header = header
 284         self.previous_block = header['previous_block']
 285         self.share_info = new_share_info
 286         self.merkle_branch = merkle_branch
 287         self.other_txs = other_txs
 288
 289         self.share_data = self.share_info['new_share_data']
 290         self.target = self.share_info['target']
 291
 292         self.new_script = self.share_data['new_script']
 293         self.subsidy = self.share_data['subsidy']
 294         self.timestamp = self.share_data['timestamp']
 295
 296         if len(self.new_script) > 100:
 297             raise ValueError('new_script too long!')
 298
 299         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 300         self.nonce = self.share_data['nonce']
 301
 302         if len(self.nonce) > 100:
 303             raise ValueError('nonce too long!')
 304
 305         if len(self.share_data['coinbase']) > 100:
 306             raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
 307
 308         self.pow_hash = net.BITCOIN_POW_FUNC(header)
 309         self.header_hash = bitcoin_data.block_header_type.hash256(header)
 310
 311         self.hash = new_share1a_type.hash256(self.as_share1a())
 312
 313         if self.pow_hash > self.target:
 314             print 'hash %x' % self.pow_hash
 315             print 'targ %x' % self.target
 316             raise ValueError('not enough work!')
 317
 318         if script.get_sigop_count(self.new_script) > 1:
 319             raise ValueError('too many sigops!')
 320
 321         # XXX eww
 322         self.time_seen = time.time()
 323         self.shared = False
 324         self.stored = False
 325         self.peer = None
 326
 327     def check(self, tracker, now, net):
 328         if self.previous_share_hash is not None:
 329             previous_share = tracker.shares[self.previous_share_hash]
 330             if not (previous_share.timestamp - 60 <= self.timestamp <= previous_share.timestamp + 60):
 331                 raise ValueError('share timestamp (%i) too far from previous timestamp (%i)' % (self.timestamp, previous_share.timestamp))
 332
 333         new_share_info, gentx = new_generate_transaction(tracker, self.share_info['new_share_data'], self.header['target'], net)
 334         if new_share_info != self.share_info:
 335             raise ValueError('share difficulty invalid')
 336
 337         if bitcoin_data.check_merkle_branch(gentx, 0, self.merkle_branch) != self.header['merkle_root']:
 338             raise ValueError('''gentx doesn't match header via merkle_branch''')
 339
 340         if self.other_txs is not None:
 341             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 342                 raise ValueError('''gentx doesn't match header via other_txs''')
 343
 344             if len(bitcoin_data.block_type.pack(dict(header=self.header, txs=[gentx] + self.other_txs))) > 1000000 - 1000:
 345                 raise ValueError('block size too large')
 346
 347 def get_pool_attempts_per_second(tracker, previous_share_hash, net, dist=None):
 348     if dist is None:
 349         dist = net.TARGET_LOOKBEHIND
 350     near = tracker.shares[previous_share_hash]
 351     far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 352     attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
 353     time = near.timestamp - far.timestamp
 354     if time == 0:
 355         time = 1
 356     return attempts//time
 357
 358 def generate_transaction(tracker, previous_share_hash, new_script, subsidy, nonce, block_target, net):
 359     height, last = tracker.get_height_and_last(previous_share_hash)
 360     assert height >= net.CHAIN_LENGTH or last is None
 361     if height < net.TARGET_LOOKBEHIND:
 362         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 363     else:
 364         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net)
 365         previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 366         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 367         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 368         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 369         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 370
 371     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 372     max_weight = 65535 * net.SPREAD * attempts_to_block
 373
 374     this_weight = 65535 * min(bitcoin_data.target_to_average_attempts(target), max_weight)
 375     other_weights, other_weights_total, other_donation_weight_total = tracker.get_cumulative_weights(previous_share_hash, min(height, net.CHAIN_LENGTH), max(0, max_weight - this_weight))
 376     dest_weights, total_weight, donation_weight_total = math.add_dicts([{new_script: this_weight}, other_weights]), this_weight + other_weights_total, other_donation_weight_total
 377     assert total_weight == sum(dest_weights.itervalues()) + donation_weight_total
 378
 379     if net.SCRIPT:
 380         amounts = dict((script, subsidy*(396*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 381         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 382         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*2//400
 383         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 384     else:
 385         amounts = dict((script, subsidy*(398*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 386         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 387         amounts[new_script] = amounts.get(new_script, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 388
 389     if sum(amounts.itervalues()) != subsidy:
 390         raise ValueError()
 391     if any(x < 0 for x in amounts.itervalues()):
 392         raise ValueError()
 393
 394     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 395     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 396
 397     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 398     assert dests[-1] == new_script
 399
 400     share_data = dict(
 401         previous_share_hash=previous_share_hash,
 402         nonce=nonce,
 403         target=target,
 404     )
 405
 406     share_info = dict(
 407         share_data=share_data,
 408         new_script=new_script,
 409         subsidy=subsidy,
 410     )
 411
 412     return share_info, dict(
 413         version=1,
 414         tx_ins=[dict(
 415             previous_output=None,
 416             sequence=None,
 417             script=coinbase_type.pack(dict(
 418                 identifier=net.IDENTIFIER,
 419                 share_data=share_data,
 420             )),
 421         )],
 422         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 423         lock_time=0,
 424     )
 425
 426 def new_generate_transaction(tracker, new_share_data, block_target, net):
 427     previous_share_hash = new_share_data['previous_share_hash']
 428     new_script = new_share_data['new_script']
 429     subsidy = new_share_data['subsidy']
 430     donation = new_share_data['donation']
 431     assert 0 <= donation <= 65535
 432
 433     height, last = tracker.get_height_and_last(previous_share_hash)
 434     assert height >= net.CHAIN_LENGTH or last is None
 435     if height < net.TARGET_LOOKBEHIND:
 436         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 437     else:
 438         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net)
 439         previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 440         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 441         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 442         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 443         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 444
 445     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 446     max_att = net.SPREAD * attempts_to_block
 447
 448     this_att = min(bitcoin_data.target_to_average_attempts(target), max_att)
 449     other_weights, other_total_weight, other_donation_weight = tracker.get_cumulative_weights(previous_share_hash, min(height, net.CHAIN_LENGTH), 65535*max(0, max_att - this_att))
 450     assert other_total_weight == sum(other_weights.itervalues()) + other_donation_weight, (other_total_weight, sum(other_weights.itervalues()) + other_donation_weight)
 451     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
 452     assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 453
 454     amounts = dict((script, subsidy*(199*weight)//(200*total_weight)) for (script, weight) in weights.iteritems())
 455     amounts[new_script] = amounts.get(new_script, 0) + subsidy//200
 456     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*(199*donation_weight)//(200*total_weight)
 457     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra satoshis :P
 458
 459     if sum(amounts.itervalues()) != subsidy:
 460         raise ValueError()
 461     if any(x < 0 for x in amounts.itervalues()):
 462         print amounts
 463         import code
 464         d = globals()
 465         d.update(locals())
 466         code.interact(local=d)
 467         raise ValueError()
 468
 469     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 470     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 471
 472     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 473     assert dests[-1] == new_script
 474
 475     new_share_info = dict(
 476         new_share_data=new_share_data,
 477         target=target,
 478     )
 479
 480     return new_share_info, dict(
 481         version=1,
 482         tx_ins=[dict(
 483             previous_output=None,
 484             sequence=None,
 485             script=new_share_data['coinbase'],
 486         )],
 487         tx_outs=[dict(value=0, script=bitcoin_data.HashType().pack(new_share_info_type.hash256(new_share_info)))] + [dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 488         lock_time=0,
 489     )
 490
 491
 492 class OkayTracker(bitcoin_data.Tracker):
 493     def __init__(self, net):
 494         bitcoin_data.Tracker.__init__(self)
 495         self.net = net
 496         self.verified = bitcoin_data.Tracker()
 497         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 498
 499         self.get_cumulative_weights = skiplists.WeightsSkipList(self)
 500
 501     def add(self, share, known_verified=False):
 502         bitcoin_data.Tracker.add(self, share)
 503         if known_verified:
 504             self.verified.add(share)
 505
 506     def attempt_verify(self, share, now):
 507         if share.hash in self.verified.shares:
 508             return True
 509         height, last = self.get_height_and_last(share.hash)
 510         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 511             raise AssertionError()
 512         try:
 513             share.check(self, now, self.net)
 514         except:
 515             log.err(None, 'Share check failed:')
 516             return False
 517         else:
 518             self.verified.add(share)
 519             return True
 520
 521     def think(self, ht, previous_block, now):
 522         desired = set()
 523
 524         # O(len(self.heads))
 525         #   make 'unverified heads' set?
 526         # for each overall head, attempt verification
 527         # if it fails, attempt on parent, and repeat
 528         # if no successful verification because of lack of parents, request parent
 529         bads = set()
 530         for head in set(self.heads) - set(self.verified.heads):
 531             head_height, last = self.get_height_and_last(head)
 532
 533             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))):
 534                 if self.attempt_verify(share, now):
 535                     break
 536                 if share.hash in self.heads:
 537                     bads.add(share.hash)
 538             else:
 539                 if last is not None:
 540                     desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 541         for bad in bads:
 542             assert bad not in self.verified.shares
 543             assert bad in self.heads
 544             if p2pool.DEBUG:
 545                 print "BAD", bad
 546             self.remove(bad)
 547
 548         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 549         for head in list(self.verified.heads):
 550             head_height, last_hash = self.verified.get_height_and_last(head)
 551             last_height, last_last_hash = self.get_height_and_last(last_hash)
 552             # XXX review boundary conditions
 553             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 554             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 555             get = min(want, can)
 556             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 557             for share in itertools.islice(self.get_chain_known(last_hash), get):
 558                 if not self.attempt_verify(share, now):
 559                     break
 560             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 561                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer, last_last_hash))
 562
 563         # decide best tree
 564         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
 565         # decide best verified head
 566         scores = sorted(self.verified.tails.get(best_tail, []), key=lambda h: (
 567             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 568             #self.verified.shares[h].peer is None,
 569             ht.get_min_height(self.verified.shares[h].previous_block),
 570             -self.verified.shares[h].time_seen
 571         ))
 572
 573
 574         if p2pool.DEBUG:
 575             print len(self.verified.tails), "chain tails and", len(self.verified.tails.get(best_tail, [])), 'chain heads. Top 10 tails:'
 576             if len(scores) > 10:
 577                 print '    ...'
 578             for h in scores[-10:]:
 579                 print '   ', format_hash(h), format_hash(self.verified.shares[h].previous_hash), (
 580                     self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 581                     self.verified.shares[h].peer is None,
 582                     ht.get_min_height(self.verified.shares[h].previous_block),
 583                     -self.verified.shares[h].time_seen
 584                 )
 585
 586         # eat away at heads
 587         if scores:
 588             for i in xrange(1000):
 589                 to_remove = set()
 590                 for share_hash, tail in self.heads.iteritems():
 591                     if share_hash in scores[-5:]:
 592                         #print 1
 593                         continue
 594                     if self.shares[share_hash].time_seen > time.time() - 300:
 595                         #print 2
 596                         continue
 597                     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
 598                         #print 3
 599                         continue
 600                     to_remove.add(share_hash)
 601                 if not to_remove:
 602                     break
 603                 for share_hash in to_remove:
 604                     self.remove(share_hash)
 605                     if share_hash in self.verified.shares:
 606                         self.verified.remove(share_hash)
 607                 #print "_________", to_remove
 608
 609         # drop tails
 610         for i in xrange(1000):
 611             to_remove = set()
 612             for tail, heads in self.tails.iteritems():
 613                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 614                     continue
 615                 for aftertail in self.reverse_shares.get(tail, set()):
 616                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 617                         print "raw"
 618                         continue
 619                     to_remove.add(aftertail)
 620             if not to_remove:
 621                 break
 622             # if removed from this, it must be removed from verified
 623             #start = time.time()
 624             for aftertail in to_remove:
 625                 if self.shares[aftertail].previous_hash not in self.tails:
 626                     print "erk", aftertail, self.shares[aftertail].previous_hash
 627                     continue
 628                 self.remove(aftertail)
 629                 if aftertail in self.verified.shares:
 630                     self.verified.remove(aftertail)
 631             #end = time.time()
 632             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 633
 634         best = scores[-1] if scores else None
 635
 636         if best is not None:
 637             best_share = self.verified.shares[best]
 638             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:
 639                 if p2pool.DEBUG:
 640                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 641                 best = best_share.previous_hash
 642
 643         return best, desired
 644
 645     @memoize.memoize_with_backing(expiring_dict.ExpiringDict(5, get_touches=False))
 646     def score(self, share_hash, ht):
 647         head_height, last = self.verified.get_height_and_last(share_hash)
 648         score2 = 0
 649         attempts = 0
 650         max_height = 0
 651         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
 652         for share in reversed(list(itertools.islice(self.verified.get_chain_known(share2_hash), self.net.CHAIN_LENGTH))):
 653             max_height = max(max_height, ht.get_min_height(share.header['previous_block']))
 654             attempts += bitcoin_data.target_to_average_attempts(share.target)
 655             this_score = attempts//(ht.get_highest_height() - max_height + 1)
 656             if this_score > score2:
 657                 score2 = this_score
 658         return min(head_height, self.net.CHAIN_LENGTH), score2
 659
 660 def format_hash(x):
 661     if x is None:
 662         return 'xxxxxxxx'
 663     return '%08x' % (x % 2**32)
 664
 665 class ShareStore(object):
 666     def __init__(self, prefix, net):
 667         self.filename = prefix
 668         self.net = net
 669         self.known = None # will be filename -> set of share hashes, set of verified hashes
 670
 671     def get_shares(self):
 672         if self.known is not None:
 673             raise AssertionError()
 674         known = {}
 675         filenames, next = self.get_filenames_and_next()
 676         for filename in filenames:
 677             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 678             with open(filename, 'rb') as f:
 679                 for line in f:
 680                     try:
 681                         type_id_str, data_hex = line.strip().split(' ')
 682                         type_id = int(type_id_str)
 683                         if type_id == 0:
 684                             share = Share.from_share1a(share1a_type.unpack(data_hex.decode('hex')), self.net)
 685                             yield 'share', share
 686                             share_hashes.add(share.hash)
 687                         elif type_id == 1:
 688                             share = Share.from_share1b(share1b_type.unpack(data_hex.decode('hex')), self.net)
 689                             yield 'share', share
 690                             share_hashes.add(share.hash)
 691                         elif type_id == 2:
 692                             verified_hash = int(data_hex, 16)
 693                             yield 'verified_hash', verified_hash
 694                             verified_hashes.add(verified_hash)
 695                         elif type_id == 5:
 696                             share = NewShare.from_share(new_share_type.unpack(data_hex.decode('hex')), self.net)
 697                             yield 'share', share
 698                             share_hashes.add(share.hash)
 699                         else:
 700                             raise NotImplementedError("share type %i" % (type_id,))
 701                     except Exception:
 702                         log.err(None, "Error while reading saved shares, continuing where left off:")
 703         self.known = known
 704
 705     def _add_line(self, line):
 706         filenames, next = self.get_filenames_and_next()
 707         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 708             filename = filenames[-1]
 709         else:
 710             filename = next
 711
 712         with open(filename, 'ab') as f:
 713             f.write(line + '\n')
 714
 715         return filename
 716
 717     def add_share(self, share):
 718         if isinstance(share, NewShare):
 719             type_id, data = 5, new_share_type.pack(share.as_share())
 720         elif share.pow_hash <= share.header['target']:
 721             type_id, data = 1, share1b_type.pack(share.as_share1b())
 722         else:
 723             type_id, data = 0, share1a_type.pack(share.as_share1a())
 724         filename = self._add_line("%i %s" % (type_id, data.encode('hex')))
 725         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 726         share_hashes.add(share.hash)
 727
 728     def add_verified_hash(self, share_hash):
 729         filename = self._add_line("%i %x" % (2, share_hash))
 730         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 731         verified_hashes.add(share_hash)
 732
 733     def get_filenames_and_next(self):
 734         suffixes = sorted(int(x[len(self.filename):]) for x in os.listdir('.') if x.startswith(self.filename) and x[len(self.filename):].isdigit())
 735         return [self.filename + str(suffix) for suffix in suffixes], self.filename + str(suffixes[-1] + 1) if suffixes else self.filename + str(0)
 736
 737     def forget_share(self, share_hash):
 738         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 739             if share_hash in share_hashes:
 740                 share_hashes.remove(share_hash)
 741         self.check_remove()
 742
 743     def forget_verified_share(self, share_hash):
 744         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 745             if share_hash in verified_hashes:
 746                 verified_hashes.remove(share_hash)
 747         self.check_remove()
 748
 749     def check_remove(self):
 750         to_remove = set()
 751         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 752             #print filename, len(share_hashes) + len(verified_hashes)
 753             if not share_hashes and not verified_hashes:
 754                 to_remove.add(filename)
 755         for filename in to_remove:
 756             self.known.pop(filename)
 757             os.remove(filename)
 758             print "REMOVED", filename
 759
 760 class BitcoinMainnet(networks.BitcoinMainnet):
 761     SHARE_PERIOD = 10 # seconds
 762     CHAIN_LENGTH = 24*60*60//5 # shares
 763     TARGET_LOOKBEHIND = 200 # shares
 764     SPREAD = 3 # blocks
 765     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 766     IDENTIFIER = 'fc70035c7a81bc6f'.decode('hex')
 767     PREFIX = '2472ef181efcd37b'.decode('hex')
 768     NAME = 'bitcoin'
 769     P2P_PORT = 9333
 770     MAX_TARGET = 2**256//2**32 - 1
 771     PERSIST = False
 772     WORKER_PORT = 9332
 773
 774 class BitcoinTestnet(networks.BitcoinTestnet):
 775     SHARE_PERIOD = 1 # seconds
 776     CHAIN_LENGTH = 24*60*60//5 # shares
 777     TARGET_LOOKBEHIND = 200 # shares
 778     SPREAD = 3 # blocks
 779     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 780     IDENTIFIER = '5fc2be2d4f0d6bfb'.decode('hex')
 781     PREFIX = '3f6057a15036f441'.decode('hex')
 782     NAME = 'bitcoin_testnet'
 783     P2P_PORT = 19333
 784     MAX_TARGET = 2**256//2**32 - 1
 785     PERSIST = False
 786     WORKER_PORT = 19332
 787
 788 class NamecoinMainnet(networks.NamecoinMainnet):
 789     SHARE_PERIOD = 10 # seconds
 790     CHAIN_LENGTH = 24*60*60//10 # shares
 791     TARGET_LOOKBEHIND = 3600//10 # shares
 792     SPREAD = 3 # blocks
 793     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 794     IDENTIFIER = 'd5b1192062c4c454'.decode('hex')
 795     PREFIX = 'b56f3d0fb24fc982'.decode('hex')
 796     NAME = 'namecoin'
 797     P2P_PORT = 9334
 798     MAX_TARGET = 2**256//2**32 - 1
 799     PERSIST = True
 800     WORKER_PORT = 9331
 801
 802 class NamecoinTestnet(networks.NamecoinTestnet):
 803     SHARE_PERIOD = 1 # seconds
 804     CHAIN_LENGTH = 24*60*60//5 # shares
 805     TARGET_LOOKBEHIND = 200 # shares
 806     SPREAD = 3 # blocks
 807     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 808     IDENTIFIER = '8dd303d014a01a60'.decode('hex')
 809     PREFIX = '4d6581d24f51acbf'.decode('hex')
 810     NAME = 'namecoin_testnet'
 811     P2P_PORT = 19334
 812     MAX_TARGET = 2**256//2**20 - 1
 813     PERSIST = False
 814     WORKER_PORT = 19331
 815
 816 class IxcoinMainnet(networks.IxcoinMainnet):
 817     SHARE_PERIOD = 10 # seconds
 818     CHAIN_LENGTH = 24*60*60//10 # shares
 819     TARGET_LOOKBEHIND = 3600//10 # shares
 820     SPREAD = 3 # blocks
 821     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 822     IDENTIFIER = '27b564116e2a2666'.decode('hex')
 823     PREFIX = '9dd6c4a619401f2f'.decode('hex')
 824     NAME = 'ixcoin'
 825     P2P_PORT = 9335
 826     MAX_TARGET = 2**256//2**32 - 1
 827     PERSIST = True
 828     WORKER_PORT = 9330
 829
 830 class IxcoinTestnet(networks.IxcoinTestnet):
 831     SHARE_PERIOD = 1 # seconds
 832     CHAIN_LENGTH = 24*60*60//5 # shares
 833     TARGET_LOOKBEHIND = 200 # shares
 834     SPREAD = 3 # blocks
 835     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 836     IDENTIFIER = '7430cbeb01249e44'.decode('hex')
 837     PREFIX = '7cfffda946709c1f'.decode('hex')
 838     NAME = 'ixcoin_testnet'
 839     P2P_PORT = 19335
 840     MAX_TARGET = 2**256//2**20 - 1
 841     PERSIST = False
 842     WORKER_PORT = 19330
 843
 844 class I0coinMainnet(networks.I0coinMainnet):
 845     SHARE_PERIOD = 10 # seconds
 846     CHAIN_LENGTH = 24*60*60//10 # shares
 847     TARGET_LOOKBEHIND = 3600//10 # shares
 848     SPREAD = 3 # blocks
 849     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 850     IDENTIFIER = 'b32e3f10c2ff221b'.decode('hex')
 851     PREFIX = '6155537ed977a3b5'.decode('hex')
 852     NAME = 'i0coin'
 853     P2P_PORT = 9336
 854     MAX_TARGET = 2**256//2**32 - 1
 855     PERSIST = False
 856     WORKER_PORT = 9329
 857
 858 class I0coinTestnet(networks.I0coinTestnet):
 859     SHARE_PERIOD = 1 # seconds
 860     CHAIN_LENGTH = 24*60*60//5 # shares
 861     TARGET_LOOKBEHIND = 200 # shares
 862     SPREAD = 3 # blocks
 863     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 864     IDENTIFIER = '7712c1a8181b5f2e'.decode('hex')
 865     PREFIX = '792d2e7d770fbe68'.decode('hex')
 866     NAME = 'i0coin_testnet'
 867     P2P_PORT = 19336
 868     MAX_TARGET = 2**256//2**20 - 1
 869     PERSIST = False
 870     WORKER_PORT = 19329
 871
 872 class SolidcoinMainnet(networks.SolidcoinMainnet):
 873     SHARE_PERIOD = 10
 874     CHAIN_LENGTH = 24*60*60//10 # shares
 875     TARGET_LOOKBEHIND = 3600//10 # shares
 876     SPREAD = 3 # blocks
 877     SCRIPT = bitcoin_data.pubkey_hash_to_script2(bitcoin_data.address_to_pubkey_hash('sMKZ1yxHETxPYKh4Z2anWnwZDJZU7ztroy', networks.SolidcoinMainnet))
 878     IDENTIFIER = '9cc9c421cca258cd'.decode('hex')
 879     PREFIX = 'c059125b8070f00a'.decode('hex')
 880     NAME = 'solidcoin'
 881     P2P_PORT = 9337
 882     MAX_TARGET = 2**256//2**32 - 1
 883     PERSIST = True
 884     WORKER_PORT = 9328
 885
 886 class LitecoinMainnet(networks.LitecoinMainnet):
 887     SHARE_PERIOD = 10 # seconds
 888     CHAIN_LENGTH = 24*60*60//5 # shares
 889     TARGET_LOOKBEHIND = 200 # shares
 890     SPREAD = 12 # blocks
 891     SCRIPT = None # no fee
 892     IDENTIFIER = 'e037d5b8c6923410'.decode('hex')
 893     PREFIX = '7208c1a53ef629b0'.decode('hex')
 894     NAME = 'litecoin'
 895     P2P_PORT = 9338
 896     MAX_TARGET = 2**256//2**20 - 1
 897     PERSIST = True
 898     WORKER_PORT = 9327
 899
 900 class LitecoinTestnet(networks.LitecoinTestnet):
 901     SHARE_PERIOD = 1 # seconds
 902     CHAIN_LENGTH = 24*60*60//5 # shares
 903     TARGET_LOOKBEHIND = 200 # shares
 904     SPREAD = 12 # blocks
 905     SCRIPT = None # no fee
 906     IDENTIFIER = 'cca5e24ec6408b1e'.decode('hex')
 907     PREFIX = 'ad9614f6466a39cf'.decode('hex')
 908     NAME = 'litecoin_testnet'
 909     P2P_PORT = 19338
 910     MAX_TARGET = 2**256//2**17 - 1
 911     PERSIST = False
 912     WORKER_PORT = 19327
 913
 914 nets = dict((net.NAME, net) for net in set([BitcoinMainnet, BitcoinTestnet, NamecoinMainnet, NamecoinTestnet, IxcoinMainnet, IxcoinTestnet, I0coinMainnet, I0coinTestnet, SolidcoinMainnet, LitecoinMainnet, LitecoinTestnet]))