p2pool/data.py

   1 from __future__ import division
   2
   3 import hashlib
   4 import os
   5 import random
   6 import time
   7
   8 from twisted.python import log
   9
  10 import p2pool
  11 from p2pool.bitcoin import data as bitcoin_data, script, sha256
  12 from p2pool.util import math, forest, pack
  13
  14 # hashlink
  15
  16 hash_link_type = pack.ComposedType([
  17     ('state', pack.FixedStrType(32)),
  18     ('extra_data', pack.FixedStrType(0)), # bit of a hack, but since the donation script is at the end, const_ending is long enough to always make this empty
  19     ('length', pack.VarIntType()),
  20 ])
  21
  22 def prefix_to_hash_link(prefix, const_ending=''):
  23     assert prefix.endswith(const_ending), (prefix, const_ending)
  24     x = sha256.sha256(prefix)
  25     return dict(state=x.state, extra_data=x.buf[:max(0, len(x.buf)-len(const_ending))], length=x.length//8)
  26
  27 def check_hash_link(hash_link, data, const_ending=''):
  28     extra_length = hash_link['length'] % (512//8)
  29     assert len(hash_link['extra_data']) == max(0, extra_length - len(const_ending))
  30     extra = (hash_link['extra_data'] + const_ending)[len(hash_link['extra_data']) + len(const_ending) - extra_length:]
  31     assert len(extra) == extra_length
  32     return pack.IntType(256).unpack(hashlib.sha256(sha256.sha256(data, (hash_link['state'], extra, 8*hash_link['length'])).digest()).digest())
  33
  34 # shares
  35
  36 # type:
  37 # 2: share1a
  38 # 3: share1b
  39
  40 share_type = pack.ComposedType([
  41     ('type', pack.VarIntType()),
  42     ('contents', pack.VarStrType()),
  43 ])
  44
  45 def load_share(share, net, peer):
  46     if share['type'] in [0, 1]:
  47         from p2pool import p2p
  48         raise p2p.PeerMisbehavingError('sent an obsolete share')
  49     elif share['type'] == 2:
  50         return Share(net, peer, other_txs=None, **Share.share1a_type.unpack(share['contents']))
  51     elif share['type'] == 3:
  52         share1b = Share.share1b_type.unpack(share['contents'])
  53         return Share(net, peer, merkle_link=bitcoin_data.calculate_merkle_link([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in share1b['other_txs']], 0), **share1b)
  54     elif share['type'] == 4:
  55         return NewShare(net, peer, other_txs=None, **NewShare.share1a_type.unpack(share['contents']))
  56     elif share['type'] == 5:
  57         share1b = NewShare.share1b_type.unpack(share['contents'])
  58         return NewShare(net, peer, merkle_link=bitcoin_data.calculate_merkle_link([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in share1b['other_txs']], 0), **share1b)
  59     else:
  60         raise ValueError('unknown share type: %r' % (share['type'],))
  61
  62 DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
  63
  64 class Share(object):
  65     small_block_header_type = pack.ComposedType([
  66         ('version', pack.VarIntType()), # XXX must be constrained to 32 bits
  67         ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
  68         ('timestamp', pack.IntType(32)),
  69         ('bits', bitcoin_data.FloatingIntegerType()),
  70         ('nonce', pack.IntType(32)),
  71     ])
  72
  73     share_data_type = pack.ComposedType([
  74         ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
  75         ('coinbase', pack.VarStrType()),
  76         ('nonce', pack.IntType(32)),
  77         ('pubkey_hash', pack.IntType(160)),
  78         ('subsidy', pack.IntType(64)),
  79         ('donation', pack.IntType(16)),
  80         ('stale_info', pack.IntType(8)), # 0 nothing, 253 orphan, 254 doa
  81     ])
  82
  83     share_info_type = pack.ComposedType([
  84         ('share_data', share_data_type),
  85         ('max_bits', bitcoin_data.FloatingIntegerType()),
  86         ('bits', bitcoin_data.FloatingIntegerType()),
  87         ('timestamp', pack.IntType(32)),
  88     ])
  89
  90     share1a_type = pack.ComposedType([
  91         ('min_header', small_block_header_type),
  92         ('share_info', share_info_type),
  93         ('hash_link', hash_link_type),
  94         ('merkle_link', pack.ComposedType([
  95             ('branch', pack.ListType(pack.IntType(256))),
  96             ('index', pack.IntType(0)), # it will always be 0
  97         ])),
  98     ])
  99
 100     share1b_type = pack.ComposedType([
 101         ('min_header', small_block_header_type),
 102         ('share_info', share_info_type),
 103         ('hash_link', hash_link_type),
 104         ('other_txs', pack.ListType(bitcoin_data.tx_type)),
 105     ])
 106
 107     ref_type = pack.ComposedType([
 108         ('identifier', pack.FixedStrType(64//8)),
 109         ('share_info', share_info_type),
 110     ])
 111
 112     gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(0) + pack.VarStrType().pack('\x20' + pack.IntType(256).pack(0))[:2]
 113
 114     @classmethod
 115     def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, net):
 116         previous_share = tracker.shares[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
 117
 118         height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
 119         assert height >= net.REAL_CHAIN_LENGTH or last is None
 120         if height < net.TARGET_LOOKBEHIND:
 121             pre_target3 = net.MAX_TARGET
 122         else:
 123             attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
 124             pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
 125             pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
 126             pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 127         max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 128         bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
 129
 130         weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
 131             min(height, net.REAL_CHAIN_LENGTH),
 132             65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
 133             True,
 134         )
 135         assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 136
 137         amounts = dict((script, share_data['subsidy']*(199*weight)//(200*total_weight)) for script, weight in weights.iteritems()) # 99.5% goes according to weights prior to this share
 138         this_script = bitcoin_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
 139         amounts[this_script] = amounts.get(this_script, 0) + share_data['subsidy']//200 # 0.5% goes to block finder
 140         amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + share_data['subsidy'] - sum(amounts.itervalues()) # all that's left over is the donation weight and some extra satoshis due to rounding
 141
 142         if sum(amounts.itervalues()) != share_data['subsidy'] or any(x < 0 for x in amounts.itervalues()):
 143             raise ValueError()
 144
 145         dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
 146
 147         share_info = dict(
 148             share_data=share_data,
 149             max_bits=max_bits,
 150             bits=bits,
 151             timestamp=math.clip(desired_timestamp, (
 152                 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
 153                 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
 154             )) if previous_share is not None else desired_timestamp,
 155         )
 156
 157         return share_info, dict(
 158             version=1,
 159             tx_ins=[dict(
 160                 previous_output=None,
 161                 sequence=None,
 162                 script=share_data['coinbase'].ljust(2, '\x00'),
 163             )],
 164             tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]] + [dict(
 165                 value=0,
 166                 script='\x20' + pack.IntType(256).pack(bitcoin_data.hash256(cls.ref_type.pack(dict(
 167                     identifier=net.IDENTIFIER,
 168                     share_info=share_info,
 169                 )))),
 170             )],
 171             lock_time=0,
 172         )
 173
 174     __slots__ = 'net min_header share_info hash_link merkle_link other_txs hash share_data max_target target timestamp previous_hash new_script desired_version gentx_hash header pow_hash header_hash time_seen peer'.split(' ')
 175
 176     def __init__(self, net, peer, min_header, share_info, hash_link, merkle_link, other_txs):
 177         if len(share_info['share_data']['coinbase']) > 100:
 178             raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
 179
 180         if len(merkle_link['branch']) > 16:
 181             raise ValueError('merkle_branch too long!')
 182
 183         if p2pool.DEBUG and other_txs is not None and bitcoin_data.calculate_merkle_link([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in other_txs], 0) != merkle_link:
 184             raise ValueError('merkle_link and other_txs do not match')
 185
 186         assert not hash_link['extra_data'], repr(hash_link['extra_data'])
 187
 188         self.net = net
 189         self.peer = peer
 190         self.min_header = min_header
 191         self.share_info = share_info
 192         self.hash_link = hash_link
 193         self.merkle_link = merkle_link
 194         self.other_txs = other_txs
 195
 196         self.share_data = self.share_info['share_data']
 197         self.max_target = self.share_info['max_bits'].target
 198         self.target = self.share_info['bits'].target
 199         self.timestamp = self.share_info['timestamp']
 200         self.previous_hash = self.share_data['previous_share_hash']
 201         self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
 202         self.desired_version = 0
 203
 204         if self.timestamp > net.SWITCH_TIME:
 205             from p2pool import p2p
 206             raise p2p.PeerMisbehavingError('peer sent an old-style share with a timestamp after the switch time')
 207
 208         self.gentx_hash = check_hash_link(
 209             hash_link,
 210             pack.IntType(256).pack(bitcoin_data.hash256(self.ref_type.pack(dict(
 211                 identifier=net.IDENTIFIER,
 212                 share_info=share_info,
 213             )))) + pack.IntType(32).pack(0),
 214             self.gentx_before_refhash,
 215         )
 216         merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, merkle_link)
 217         self.header = dict(min_header, merkle_root=merkle_root)
 218         self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
 219         self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
 220
 221         if self.pow_hash > self.target:
 222             raise p2p.PeerMisbehavingError('share PoW invalid')
 223
 224         if other_txs is not None and not self.pow_hash <= self.header['bits'].target:
 225             raise ValueError('other_txs provided when not a block solution')
 226         if other_txs is None and self.pow_hash <= self.header['bits'].target:
 227             raise ValueError('other_txs not provided when a block solution')
 228
 229         self.hash = bitcoin_data.hash256(share_type.pack(self.as_share()))
 230
 231         # XXX eww
 232         self.time_seen = time.time()
 233
 234     def __repr__(self):
 235         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 236
 237     def check(self, tracker):
 238         share_info, gentx = self.generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.share_info['bits'].target, self.net)
 239         if share_info != self.share_info:
 240             raise ValueError('share difficulty invalid')
 241         if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
 242             raise ValueError('''gentx doesn't match hash_link''')
 243
 244     def as_share(self):
 245         if not self.pow_hash <= self.header['bits'].target: # share1a
 246             return dict(type=2, contents=self.share1a_type.pack(dict(min_header=self.min_header, share_info=self.share_info, hash_link=self.hash_link, merkle_link=self.merkle_link)))
 247         else: # share1b
 248             return dict(type=3, contents=self.share1b_type.pack(dict(min_header=self.min_header, share_info=self.share_info, hash_link=self.hash_link, other_txs=self.other_txs)))
 249
 250     def as_block(self, tracker):
 251         if self.other_txs is None:
 252             raise ValueError('share does not contain all txs')
 253
 254         share_info, gentx = self.generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.share_info['bits'].target, self.net)
 255         assert share_info == self.share_info
 256
 257         return dict(header=self.header, txs=[gentx] + self.other_txs)
 258
 259 class NewShare(Share):
 260     share_data_type = pack.ComposedType([
 261         ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 262         ('coinbase', pack.VarStrType()),
 263         ('nonce', pack.IntType(32)),
 264         ('pubkey_hash', pack.IntType(160)),
 265         ('subsidy', pack.IntType(64)),
 266         ('donation', pack.IntType(16)),
 267         ('stale_info', pack.IntType(8)), # 0 nothing, 253 orphan, 254 doa
 268         ('desired_version', pack.VarIntType()),
 269     ])
 270
 271     share_info_type = pack.ComposedType([
 272         ('share_data', share_data_type),
 273         ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 274         ('max_bits', bitcoin_data.FloatingIntegerType()),
 275         ('bits', bitcoin_data.FloatingIntegerType()),
 276         ('timestamp', pack.IntType(32)),
 277     ])
 278
 279     share_common_type = pack.ComposedType([
 280         ('min_header', Share.small_block_header_type),
 281         ('share_info', share_info_type),
 282         ('ref_merkle_link', pack.ComposedType([
 283             ('branch', pack.ListType(pack.IntType(256))),
 284             ('index', pack.VarIntType()),
 285         ])),
 286         ('hash_link', hash_link_type),
 287     ])
 288     share1a_type = pack.ComposedType([
 289         ('common', share_common_type),
 290         ('merkle_link', pack.ComposedType([
 291             ('branch', pack.ListType(pack.IntType(256))),
 292             ('index', pack.IntType(0)), # it will always be 0
 293         ])),
 294     ])
 295     share1b_type = pack.ComposedType([
 296         ('common', share_common_type),
 297         ('other_txs', pack.ListType(bitcoin_data.tx_type)),
 298     ])
 299
 300     ref_type = pack.ComposedType([
 301         ('identifier', pack.FixedStrType(64//8)),
 302         ('share_info', share_info_type),
 303     ])
 304
 305     @classmethod
 306     def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, ref_merkle_link, net):
 307         previous_share = tracker.shares[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
 308
 309         height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
 310         assert height >= net.REAL_CHAIN_LENGTH or last is None
 311         if height < net.TARGET_LOOKBEHIND:
 312             pre_target3 = net.MAX_TARGET
 313         else:
 314             attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
 315             pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
 316             pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
 317             pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 318         max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 319         bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
 320
 321         weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
 322             min(height, net.REAL_CHAIN_LENGTH),
 323             65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
 324             False,
 325         )
 326         assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 327
 328         amounts = dict((script, share_data['subsidy']*(199*weight)//(200*total_weight)) for script, weight in weights.iteritems()) # 99.5% goes according to weights prior to this share
 329         this_script = bitcoin_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
 330         amounts[this_script] = amounts.get(this_script, 0) + share_data['subsidy']//200 # 0.5% goes to block finder
 331         amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + share_data['subsidy'] - sum(amounts.itervalues()) # all that's left over is the donation weight and some extra satoshis due to rounding
 332
 333         if sum(amounts.itervalues()) != share_data['subsidy'] or any(x < 0 for x in amounts.itervalues()):
 334             raise ValueError()
 335
 336         dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
 337
 338         share_info = dict(
 339             share_data=share_data,
 340             far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
 341             max_bits=max_bits,
 342             bits=bits,
 343             timestamp=math.clip(desired_timestamp, (
 344                 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
 345                 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
 346             )) if previous_share is not None else desired_timestamp,
 347         )
 348
 349         return share_info, dict(
 350             version=1,
 351             tx_ins=[dict(
 352                 previous_output=None,
 353                 sequence=None,
 354                 script=share_data['coinbase'].ljust(2, '\x00'),
 355             )],
 356             tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]] + [dict(
 357                 value=0,
 358                 script='\x20' + cls.get_ref_hash(net, share_info, ref_merkle_link),
 359             )],
 360             lock_time=0,
 361         )
 362
 363     @classmethod
 364     def get_ref_hash(cls, net, share_info, ref_merkle_link):
 365         return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
 366             identifier=net.IDENTIFIER,
 367             share_info=share_info,
 368         ))), ref_merkle_link))
 369
 370     __slots__ = 'net peer common min_header share_info hash_link merkle_link other_txs hash share_data max_target target timestamp previous_hash new_script desired_version gentx_hash header pow_hash header_hash time_seen'.split(' ')
 371
 372     def __init__(self, net, peer, common, merkle_link, other_txs):
 373         self.net = net
 374         self.peer = peer
 375         self.common = common
 376         self.min_header = common['min_header']
 377         self.share_info = common['share_info']
 378         self.hash_link = common['hash_link']
 379         self.merkle_link = merkle_link
 380         self.other_txs = other_txs
 381
 382         if len(self.share_info['share_data']['coinbase']) > 100:
 383             raise ValueError('''coinbase too large! %i bytes''' % (len(self.self.share_data['coinbase']),))
 384
 385         if len(merkle_link['branch']) > 16:
 386             raise ValueError('merkle branch too long!')
 387
 388         if p2pool.DEBUG and other_txs is not None and bitcoin_data.calculate_merkle_link([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in other_txs], 0) != merkle_link:
 389             raise ValueError('merkle_link and other_txs do not match')
 390
 391         assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
 392
 393         self.share_data = self.share_info['share_data']
 394         self.max_target = self.share_info['max_bits'].target
 395         self.target = self.share_info['bits'].target
 396         self.timestamp = self.share_info['timestamp']
 397         self.previous_hash = self.share_data['previous_share_hash']
 398         self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
 399         self.desired_version = self.share_data['desired_version']
 400
 401         if self.timestamp < net.SWITCH_TIME:
 402             from p2pool import p2p
 403             raise p2p.PeerMisbehavingError('peer sent a new-style share with a timestamp before the switch time')
 404
 405         self.gentx_hash = check_hash_link(
 406             self.hash_link,
 407             self.get_ref_hash(net, self.share_info, common['ref_merkle_link']) + pack.IntType(32).pack(0),
 408             self.gentx_before_refhash,
 409         )
 410         merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, merkle_link)
 411         self.header = dict(self.min_header, merkle_root=merkle_root)
 412         self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
 413         self.hash = self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
 414
 415         if self.pow_hash > self.target:
 416             raise p2p.PeerMisbehavingError('share PoW invalid')
 417
 418         if other_txs is not None and not self.pow_hash <= self.header['bits'].target:
 419             raise ValueError('other_txs provided when not a block solution')
 420         if other_txs is None and self.pow_hash <= self.header['bits'].target:
 421             raise ValueError('other_txs not provided when a block solution')
 422
 423         # XXX eww
 424         self.time_seen = time.time()
 425
 426     def as_share(self):
 427         if not self.pow_hash <= self.header['bits'].target: # share1a
 428             return dict(type=4, contents=self.share1a_type.pack(dict(common=self.common, merkle_link=self.merkle_link)))
 429         else: # share1b
 430             return dict(type=5, contents=self.share1b_type.pack(dict(common=self.common, other_txs=self.other_txs)))
 431
 432     def check(self, tracker):
 433         share_info, gentx = self.generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.share_info['bits'].target, self.common['ref_merkle_link'], self.net)
 434         if share_info != self.share_info:
 435             raise ValueError('share_info invalid')
 436         if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
 437             raise ValueError('''gentx doesn't match hash_link''')
 438         return gentx # only used by as_block
 439
 440     def as_block(self, tracker):
 441         if self.other_txs is None:
 442             raise ValueError('share does not contain all txs')
 443         return dict(header=self.header, txs=[self.check(tracker)] + self.other_txs)
 444
 445 class WeightsSkipList(forest.TrackerSkipList):
 446     # share_count, weights, total_weight
 447
 448     def get_delta(self, element):
 449         from p2pool.bitcoin import data as bitcoin_data
 450         share = self.tracker.shares[element]
 451         att = bitcoin_data.target_to_average_attempts(share.target)
 452         return 1, {share.new_script: att*(65535-share.share_data['donation'])}, att*65535, att*share.share_data['donation']
 453
 454     def combine_deltas(self, (share_count1, weights1, total_weight1, total_donation_weight1), (share_count2, weights2, total_weight2, total_donation_weight2)):
 455         return share_count1 + share_count2, math.add_dicts(weights1, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 456
 457     def initial_solution(self, start, (max_shares, desired_weight, broken_mode)):
 458         assert desired_weight % 65535 == 0, divmod(desired_weight, 65535)
 459         return 0, None, 0, 0
 460
 461     def apply_delta(self, (share_count1, weights_list, total_weight1, total_donation_weight1), (share_count2, weights2, total_weight2, total_donation_weight2), (max_shares, desired_weight, broken_mode)):
 462         if total_weight1 + total_weight2 > desired_weight and share_count2 == 1:
 463             assert (desired_weight - total_weight1) % 65535 == 0
 464             script, = weights2.iterkeys()
 465             if broken_mode:
 466                 new_weights = dict(script=(desired_weight - total_weight1)//65535*weights2[script]//(total_weight2//65535))
 467             else:
 468                 new_weights = {script: (desired_weight - total_weight1)//65535*weights2[script]//(total_weight2//65535)}
 469             return share_count1 + share_count2, (weights_list, new_weights), desired_weight, total_donation_weight1 + (desired_weight - total_weight1)//65535*total_donation_weight2//(total_weight2//65535)
 470         return share_count1 + share_count2, (weights_list, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 471
 472     def judge(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight, broken_mode)):
 473         if share_count > max_shares or total_weight > desired_weight:
 474             return 1
 475         elif share_count == max_shares or total_weight == desired_weight:
 476             return 0
 477         else:
 478             return -1
 479
 480     def finalize(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight, broken_mode)):
 481         assert share_count <= max_shares and total_weight <= desired_weight
 482         assert share_count == max_shares or total_weight == desired_weight
 483         return math.add_dicts(*math.flatten_linked_list(weights_list)), total_weight, total_donation_weight
 484
 485 class OkayTracker(forest.Tracker):
 486     def __init__(self, net, my_share_hashes, my_doa_share_hashes):
 487         forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 488             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 489             min_work=lambda share: bitcoin_data.target_to_average_attempts(share.max_target),
 490         )))
 491         self.net = net
 492         self.verified = forest.Tracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 493             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 494             my_count=lambda share: 1 if share.hash in my_share_hashes else 0,
 495             my_doa_count=lambda share: 1 if share.hash in my_doa_share_hashes else 0,
 496             my_orphan_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 253 else 0,
 497             my_dead_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 254 else 0,
 498         )))
 499         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 500
 501         self.get_cumulative_weights = WeightsSkipList(self)
 502
 503     def attempt_verify(self, share):
 504         if share.hash in self.verified.shares:
 505             return True
 506         height, last = self.get_height_and_last(share.hash)
 507         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 508             raise AssertionError()
 509         try:
 510             share.check(self)
 511         except:
 512             log.err(None, 'Share check failed:')
 513             return False
 514         else:
 515             self.verified.add(share)
 516             return True
 517
 518     def think(self, block_rel_height_func, previous_block, bits):
 519         desired = set()
 520
 521         # O(len(self.heads))
 522         #   make 'unverified heads' set?
 523         # for each overall head, attempt verification
 524         # if it fails, attempt on parent, and repeat
 525         # if no successful verification because of lack of parents, request parent
 526         bads = set()
 527         for head in set(self.heads) - set(self.verified.heads):
 528             head_height, last = self.get_height_and_last(head)
 529
 530             for share in self.get_chain(head, head_height if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
 531                 if self.attempt_verify(share):
 532                     break
 533                 if share.hash in self.heads:
 534                     bads.add(share.hash)
 535             else:
 536                 if last is not None:
 537                     desired.add((
 538                         self.shares[random.choice(list(self.reverse_shares[last]))].peer,
 539                         last,
 540                         max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 541                         min(x.target for x in self.get_chain(head, min(head_height, 5))),
 542                     ))
 543         for bad in bads:
 544             assert bad not in self.verified.shares
 545             assert bad in self.heads
 546             if p2pool.DEBUG:
 547                 print "BAD", bad
 548             self.remove(bad)
 549
 550         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 551         for head in list(self.verified.heads):
 552             head_height, last_hash = self.verified.get_height_and_last(head)
 553             last_height, last_last_hash = self.get_height_and_last(last_hash)
 554             # XXX review boundary conditions
 555             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 556             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 557             get = min(want, can)
 558             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 559             for share in self.get_chain(last_hash, get):
 560                 if not self.attempt_verify(share):
 561                     break
 562             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 563                 desired.add((
 564                     self.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer,
 565                     last_last_hash,
 566                     max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 567                     min(x.target for x in self.get_chain(head, min(head_height, 5))),
 568                 ))
 569
 570         # decide best tree
 571         decorated_tails = sorted((self.score(max(self.verified.tails[tail_hash], key=self.verified.get_work), block_rel_height_func), tail_hash) for tail_hash in self.verified.tails)
 572         if p2pool.DEBUG:
 573             print len(decorated_tails), 'tails:'
 574             for score, tail_hash in decorated_tails:
 575                 print format_hash(tail_hash), score
 576         best_tail_score, best_tail = decorated_tails[-1] if decorated_tails else (None, None)
 577
 578         # decide best verified head
 579         decorated_heads = sorted(((
 580             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 581             #self.shares[h].peer is None,
 582             self.shares[h].pow_hash <= self.shares[h].header['bits'].target, # is block solution
 583             (self.shares[h].header['previous_block'], self.shares[h].header['bits']) == (previous_block, bits) or self.shares[h].peer is None,
 584             -self.shares[h].time_seen,
 585         ), h) for h in self.verified.tails.get(best_tail, []))
 586         if p2pool.DEBUG:
 587             print len(decorated_heads), 'heads. Top 10:'
 588             for score, head_hash in decorated_heads[-10:]:
 589                 print '   ', format_hash(head_hash), format_hash(self.shares[head_hash].previous_hash), score
 590         best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
 591
 592         # eat away at heads
 593         if decorated_heads:
 594             for i in xrange(1000):
 595                 to_remove = set()
 596                 for share_hash, tail in self.heads.iteritems():
 597                     if share_hash in [head_hash for score, head_hash in decorated_heads[-5:]]:
 598                         #print 1
 599                         continue
 600                     if self.shares[share_hash].time_seen > time.time() - 300:
 601                         #print 2
 602                         continue
 603                     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
 604                         #print 3
 605                         continue
 606                     to_remove.add(share_hash)
 607                 if not to_remove:
 608                     break
 609                 for share_hash in to_remove:
 610                     self.remove(share_hash)
 611                     if share_hash in self.verified.shares:
 612                         self.verified.remove(share_hash)
 613                 #print "_________", to_remove
 614
 615         # drop tails
 616         for i in xrange(1000):
 617             to_remove = set()
 618             for tail, heads in self.tails.iteritems():
 619                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 620                     continue
 621                 for aftertail in self.reverse_shares.get(tail, set()):
 622                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 623                         print "raw"
 624                         continue
 625                     to_remove.add(aftertail)
 626             if not to_remove:
 627                 break
 628             # if removed from this, it must be removed from verified
 629             #start = time.time()
 630             for aftertail in to_remove:
 631                 if self.shares[aftertail].previous_hash not in self.tails:
 632                     print "erk", aftertail, self.shares[aftertail].previous_hash
 633                     continue
 634                 self.remove(aftertail)
 635                 if aftertail in self.verified.shares:
 636                     self.verified.remove(aftertail)
 637             #end = time.time()
 638             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 639
 640         if best is not None:
 641             best_share = self.shares[best]
 642             if (best_share.header['previous_block'], best_share.header['bits']) != (previous_block, bits) and best_share.header_hash != previous_block and best_share.peer is not None:
 643                 if p2pool.DEBUG:
 644                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 645                 best = best_share.previous_hash
 646
 647             timestamp_cutoff = min(int(time.time()), best_share.timestamp) - 3600
 648             target_cutoff = 2**256//(self.net.SHARE_PERIOD*best_tail_score[1] + 1) * 2 if best_tail_score[1] is not None else 2**256-1
 649         else:
 650             timestamp_cutoff = int(time.time()) - 24*60*60
 651             target_cutoff = 2**256-1
 652
 653         if p2pool.DEBUG:
 654             print 'Desire %i shares. Cutoff: %s old diff>%.2f' % (len(desired), math.format_dt(time.time() - timestamp_cutoff), bitcoin_data.target_to_difficulty(target_cutoff))
 655             for peer, hash, ts, targ in desired:
 656                 print '   ', '%s:%i' % peer.addr if peer is not None else None, format_hash(hash), math.format_dt(time.time() - ts), bitcoin_data.target_to_difficulty(targ), ts >= timestamp_cutoff, targ <= target_cutoff
 657
 658         return best, [(peer, hash) for peer, hash, ts, targ in desired if ts >= timestamp_cutoff and targ <= target_cutoff]
 659
 660     def score(self, share_hash, block_rel_height_func):
 661         # returns approximate lower bound on chain's hashrate in the last self.net.CHAIN_LENGTH*15//16*self.net.SHARE_PERIOD time
 662
 663         head_height = self.verified.get_height(share_hash)
 664         if head_height < self.net.CHAIN_LENGTH:
 665             return head_height, None
 666
 667         end_point = self.verified.get_nth_parent_hash(share_hash, self.net.CHAIN_LENGTH*15//16)
 668
 669         block_height = max(block_rel_height_func(share.header['previous_block']) for share in
 670             self.verified.get_chain(end_point, self.net.CHAIN_LENGTH//16))
 671
 672         return self.net.CHAIN_LENGTH, (self.verified.get_work(share_hash) - self.verified.get_work(end_point))//((0 - block_height + 1)*self.net.PARENT.BLOCK_PERIOD)
 673
 674 def get_pool_attempts_per_second(tracker, previous_share_hash, dist, min_work=False, integer=False):
 675     assert dist >= 2
 676     near = tracker.shares[previous_share_hash]
 677     far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 678     attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash) if not min_work else tracker.get_delta(near.hash).min_work - tracker.get_delta(far.hash).min_work
 679     time = near.timestamp - far.timestamp
 680     if time <= 0:
 681         time = 1
 682     if integer:
 683         return attempts//time
 684     return attempts/time
 685
 686 def get_average_stale_prop(tracker, share_hash, lookbehind):
 687     stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] != 0)
 688     return stales/(lookbehind + stales)
 689
 690 def get_expected_payouts(tracker, best_share_hash, block_target, subsidy, net):
 691     weights, total_weight, donation_weight = tracker.get_cumulative_weights(best_share_hash, min(tracker.get_height(best_share_hash), net.REAL_CHAIN_LENGTH), 65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target), False)
 692     res = dict((script, subsidy*weight//total_weight) for script, weight in weights.iteritems())
 693     res[DONATION_SCRIPT] = res.get(DONATION_SCRIPT, 0) + subsidy - sum(res.itervalues())
 694     return res
 695
 696 def get_desired_version_counts(tracker, best_share_hash, dist):
 697     res = {}
 698     for share in tracker.get_chain(best_share_hash, dist):
 699         res[share.desired_version] = res.get(share.desired_version, 0) + bitcoin_data.target_to_average_attempts(share.target)
 700     return res
 701
 702 def format_hash(x):
 703     if x is None:
 704         return 'xxxxxxxx'
 705     return '%08x' % (x % 2**32)
 706
 707 class ShareStore(object):
 708     def __init__(self, prefix, net):
 709         self.filename = prefix
 710         self.dirname = os.path.dirname(os.path.abspath(prefix))
 711         self.filename = os.path.basename(os.path.abspath(prefix))
 712         self.net = net
 713         self.known = None # will be filename -> set of share hashes, set of verified hashes
 714         self.known_desired = None
 715
 716     def get_shares(self):
 717         if self.known is not None:
 718             raise AssertionError()
 719         known = {}
 720         filenames, next = self.get_filenames_and_next()
 721         for filename in filenames:
 722             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 723             with open(filename, 'rb') as f:
 724                 for line in f:
 725                     try:
 726                         type_id_str, data_hex = line.strip().split(' ')
 727                         type_id = int(type_id_str)
 728                         if type_id == 0:
 729                             pass
 730                         elif type_id == 1:
 731                             pass
 732                         elif type_id == 2:
 733                             verified_hash = int(data_hex, 16)
 734                             yield 'verified_hash', verified_hash
 735                             verified_hashes.add(verified_hash)
 736                         elif type_id == 5:
 737                             raw_share = share_type.unpack(data_hex.decode('hex'))
 738                             if raw_share['type'] in [0, 1]:
 739                                 continue
 740                             share = load_share(raw_share, self.net, None)
 741                             yield 'share', share
 742                             share_hashes.add(share.hash)
 743                         else:
 744                             raise NotImplementedError("share type %i" % (type_id,))
 745                     except Exception:
 746                         log.err(None, "Error while reading saved shares, continuing where left off:")
 747         self.known = known
 748         self.known_desired = dict((k, (set(a), set(b))) for k, (a, b) in known.iteritems())
 749
 750     def _add_line(self, line):
 751         filenames, next = self.get_filenames_and_next()
 752         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 753             filename = filenames[-1]
 754         else:
 755             filename = next
 756
 757         with open(filename, 'ab') as f:
 758             f.write(line + '\n')
 759
 760         return filename
 761
 762     def add_share(self, share):
 763         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 764             if share.hash in share_hashes:
 765                 break
 766         else:
 767             filename = self._add_line("%i %s" % (5, share_type.pack(share.as_share()).encode('hex')))
 768             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 769             share_hashes.add(share.hash)
 770         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 771         share_hashes.add(share.hash)
 772
 773     def add_verified_hash(self, share_hash):
 774         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 775             if share_hash in verified_hashes:
 776                 break
 777         else:
 778             filename = self._add_line("%i %x" % (2, share_hash))
 779             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 780             verified_hashes.add(share_hash)
 781         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 782         verified_hashes.add(share_hash)
 783
 784     def get_filenames_and_next(self):
 785         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())
 786         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)))
 787
 788     def forget_share(self, share_hash):
 789         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 790             if share_hash in share_hashes:
 791                 share_hashes.remove(share_hash)
 792         self.check_remove()
 793
 794     def forget_verified_share(self, share_hash):
 795         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 796             if share_hash in verified_hashes:
 797                 verified_hashes.remove(share_hash)
 798         self.check_remove()
 799
 800     def check_remove(self):
 801         to_remove = set()
 802         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 803             #print filename, len(share_hashes) + len(verified_hashes)
 804             if not share_hashes and not verified_hashes:
 805                 to_remove.add(filename)
 806         for filename in to_remove:
 807             self.known.pop(filename)
 808             self.known_desired.pop(filename)
 809             os.remove(filename)
 810             print "REMOVED", filename