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, 2, 3]:
  47         from p2pool import p2p
  48         raise p2p.PeerMisbehavingError('sent an obsolete share')
  49     elif share['type'] == 4:
  50         return Share(net, peer, other_txs=None, **Share.share1a_type.unpack(share['contents']))
  51     elif share['type'] == 5:
  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     else:
  55         raise ValueError('unknown share type: %r' % (share['type'],))
  56
  57 DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
  58
  59 class Share(object):
  60     small_block_header_type = pack.ComposedType([
  61         ('version', pack.VarIntType()), # XXX must be constrained to 32 bits
  62         ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
  63         ('timestamp', pack.IntType(32)),
  64         ('bits', bitcoin_data.FloatingIntegerType()),
  65         ('nonce', pack.IntType(32)),
  66     ])
  67
  68     share_data_type = pack.ComposedType([
  69         ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
  70         ('coinbase', pack.VarStrType()),
  71         ('nonce', pack.IntType(32)),
  72         ('pubkey_hash', pack.IntType(160)),
  73         ('subsidy', pack.IntType(64)),
  74         ('donation', pack.IntType(16)),
  75         ('stale_info', pack.EnumType(pack.IntType(8), dict((k, {0: None, 253: 'orphan', 254: 'doa'}.get(k, 'unk%i' % (k,))) for k in xrange(256)))),
  76         ('desired_version', pack.VarIntType()),
  77     ])
  78
  79     share_info_type = pack.ComposedType([
  80         ('share_data', share_data_type),
  81         ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
  82         ('max_bits', bitcoin_data.FloatingIntegerType()),
  83         ('bits', bitcoin_data.FloatingIntegerType()),
  84         ('timestamp', pack.IntType(32)),
  85     ])
  86
  87     share_common_type = pack.ComposedType([
  88         ('min_header', small_block_header_type),
  89         ('share_info', share_info_type),
  90         ('ref_merkle_link', pack.ComposedType([
  91             ('branch', pack.ListType(pack.IntType(256))),
  92             ('index', pack.VarIntType()),
  93         ])),
  94         ('hash_link', hash_link_type),
  95     ])
  96     share1a_type = pack.ComposedType([
  97         ('common', share_common_type),
  98         ('merkle_link', pack.ComposedType([
  99             ('branch', pack.ListType(pack.IntType(256))),
 100             ('index', pack.IntType(0)), # it will always be 0
 101         ])),
 102     ])
 103     share1b_type = pack.ComposedType([
 104         ('common', share_common_type),
 105         ('other_txs', pack.ListType(bitcoin_data.tx_type)),
 106     ])
 107
 108     ref_type = pack.ComposedType([
 109         ('identifier', pack.FixedStrType(64//8)),
 110         ('share_info', share_info_type),
 111     ])
 112
 113     gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(0) + pack.VarStrType().pack('\x20' + pack.IntType(256).pack(0))[:2]
 114
 115     @classmethod
 116     def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, ref_merkle_link, desired_other_transaction_hashes, net):
 117         previous_share = tracker.items[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
 118
 119         height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
 120         assert height >= net.REAL_CHAIN_LENGTH or last is None
 121         if height < net.TARGET_LOOKBEHIND:
 122             pre_target3 = net.MAX_TARGET
 123         else:
 124             attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
 125             pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
 126             pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
 127             pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 128         max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 129         bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
 130
 131         weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
 132             min(height, net.REAL_CHAIN_LENGTH),
 133             65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
 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             far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
 150             max_bits=max_bits,
 151             bits=bits,
 152             timestamp=math.clip(desired_timestamp, (
 153                 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
 154                 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
 155             )) if previous_share is not None else desired_timestamp,
 156         )
 157
 158         gentx = dict(
 159             version=1,
 160             tx_ins=[dict(
 161                 previous_output=None,
 162                 sequence=None,
 163                 script=share_data['coinbase'].ljust(2, '\x00'),
 164             )],
 165             tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script] or script == DONATION_SCRIPT] + [dict(
 166                 value=0,
 167                 script='\x20' + cls.get_ref_hash(net, share_info, ref_merkle_link),
 168             )],
 169             lock_time=0,
 170         )
 171
 172         def get_share(header, transactions):
 173             assert transactions[0] == gentx and [bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx)) for tx in transactions[1:]] == desired_other_transaction_hashes
 174             min_header = dict(header);del min_header['merkle_root']
 175             hash_link = prefix_to_hash_link(bitcoin_data.tx_type.pack(gentx)[:-32-4], cls.gentx_before_refhash)
 176             merkle_link = bitcoin_data.calculate_merkle_link([None] + desired_other_transaction_hashes, 0)
 177             pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(header))
 178             return cls(net, None, dict(
 179                 min_header=min_header, share_info=share_info, hash_link=hash_link,
 180                 ref_merkle_link=dict(branch=[], index=0),
 181             ), merkle_link=merkle_link, other_txs=transactions[1:] if pow_hash <= header['bits'].target else None)
 182
 183         return share_info, gentx, desired_other_transaction_hashes, get_share
 184
 185     @classmethod
 186     def get_ref_hash(cls, net, share_info, ref_merkle_link):
 187         return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
 188             identifier=net.IDENTIFIER,
 189             share_info=share_info,
 190         ))), ref_merkle_link))
 191
 192     __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(' ')
 193
 194     def __init__(self, net, peer, common, merkle_link, other_txs):
 195         self.net = net
 196         self.peer = peer
 197         self.common = common
 198         self.min_header = common['min_header']
 199         self.share_info = common['share_info']
 200         self.hash_link = common['hash_link']
 201         self.merkle_link = merkle_link
 202         self.other_txs = other_txs
 203
 204         if len(self.share_info['share_data']['coinbase']) > 100:
 205             raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_info['share_data']['coinbase']),))
 206
 207         if len(merkle_link['branch']) > 16:
 208             raise ValueError('merkle branch too long!')
 209
 210         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:
 211             raise ValueError('merkle_link and other_txs do not match')
 212
 213         assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
 214
 215         self.share_data = self.share_info['share_data']
 216         self.max_target = self.share_info['max_bits'].target
 217         self.target = self.share_info['bits'].target
 218         self.timestamp = self.share_info['timestamp']
 219         self.previous_hash = self.share_data['previous_share_hash']
 220         self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
 221         self.desired_version = self.share_data['desired_version']
 222
 223         self.gentx_hash = check_hash_link(
 224             self.hash_link,
 225             self.get_ref_hash(net, self.share_info, common['ref_merkle_link']) + pack.IntType(32).pack(0),
 226             self.gentx_before_refhash,
 227         )
 228         merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, merkle_link)
 229         self.header = dict(self.min_header, merkle_root=merkle_root)
 230         self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
 231         self.hash = self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
 232
 233         if self.pow_hash > self.target:
 234             from p2pool import p2p
 235             raise p2p.PeerMisbehavingError('share PoW invalid')
 236
 237         if other_txs is not None and not self.pow_hash <= self.header['bits'].target:
 238             raise ValueError('other_txs provided when not a block solution')
 239         if other_txs is None and self.pow_hash <= self.header['bits'].target:
 240             raise ValueError('other_txs not provided when a block solution')
 241
 242         # XXX eww
 243         self.time_seen = time.time()
 244
 245     def __repr__(self):
 246         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 247
 248     def as_share1a(self):
 249         return dict(type=4, contents=self.share1a_type.pack(dict(common=self.common, merkle_link=self.merkle_link)))
 250
 251     def as_share1b(self):
 252         return dict(type=5, contents=self.share1b_type.pack(dict(common=self.common, other_txs=self.other_txs)))
 253
 254     def as_share(self):
 255         if not self.pow_hash <= self.header['bits'].target: # share1a
 256             return self.as_share1a()
 257         else:
 258             return self.as_share1b()
 259
 260     def check(self, tracker):
 261         share_info, gentx, other_transaction_hashes, get_share = 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) # ok because desired_other_transaction_hashes is only used in get_share
 262         if share_info != self.share_info:
 263             raise ValueError('share_info invalid')
 264         if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
 265             raise ValueError('''gentx doesn't match hash_link''')
 266         return gentx # only used by as_block
 267
 268     def as_block(self, tracker):
 269         if self.other_txs is None:
 270             raise ValueError('share does not contain all txs')
 271         return dict(header=self.header, txs=[self.check(tracker)] + self.other_txs)
 272
 273 class WeightsSkipList(forest.TrackerSkipList):
 274     # share_count, weights, total_weight
 275
 276     def get_delta(self, element):
 277         from p2pool.bitcoin import data as bitcoin_data
 278         share = self.tracker.items[element]
 279         att = bitcoin_data.target_to_average_attempts(share.target)
 280         return 1, {share.new_script: att*(65535-share.share_data['donation'])}, att*65535, att*share.share_data['donation']
 281
 282     def combine_deltas(self, (share_count1, weights1, total_weight1, total_donation_weight1), (share_count2, weights2, total_weight2, total_donation_weight2)):
 283         return share_count1 + share_count2, math.add_dicts(weights1, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 284
 285     def initial_solution(self, start, (max_shares, desired_weight)):
 286         assert desired_weight % 65535 == 0, divmod(desired_weight, 65535)
 287         return 0, None, 0, 0
 288
 289     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)):
 290         if total_weight1 + total_weight2 > desired_weight and share_count2 == 1:
 291             assert (desired_weight - total_weight1) % 65535 == 0
 292             script, = weights2.iterkeys()
 293             new_weights = {script: (desired_weight - total_weight1)//65535*weights2[script]//(total_weight2//65535)}
 294             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)
 295         return share_count1 + share_count2, (weights_list, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 296
 297     def judge(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
 298         if share_count > max_shares or total_weight > desired_weight:
 299             return 1
 300         elif share_count == max_shares or total_weight == desired_weight:
 301             return 0
 302         else:
 303             return -1
 304
 305     def finalize(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
 306         assert share_count <= max_shares and total_weight <= desired_weight
 307         assert share_count == max_shares or total_weight == desired_weight
 308         return math.add_dicts(*math.flatten_linked_list(weights_list)), total_weight, total_donation_weight
 309
 310 class OkayTracker(forest.Tracker):
 311     def __init__(self, net, my_share_hashes, my_doa_share_hashes):
 312         forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 313             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 314             min_work=lambda share: bitcoin_data.target_to_average_attempts(share.max_target),
 315         )))
 316         self.net = net
 317         self.verified = forest.Tracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 318             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 319             my_count=lambda share: 1 if share.hash in my_share_hashes else 0,
 320             my_doa_count=lambda share: 1 if share.hash in my_doa_share_hashes else 0,
 321             my_orphan_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 'orphan' else 0,
 322             my_dead_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 'doa' else 0,
 323         )), subset_of=self)
 324         self.get_cumulative_weights = WeightsSkipList(self)
 325
 326     def attempt_verify(self, share):
 327         if share.hash in self.verified.items:
 328             return True
 329         height, last = self.get_height_and_last(share.hash)
 330         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 331             raise AssertionError()
 332         try:
 333             share.check(self)
 334         except:
 335             log.err(None, 'Share check failed:')
 336             return False
 337         else:
 338             self.verified.add(share)
 339             return True
 340
 341     def think(self, block_rel_height_func, previous_block, bits):
 342         desired = set()
 343
 344         # O(len(self.heads))
 345         #   make 'unverified heads' set?
 346         # for each overall head, attempt verification
 347         # if it fails, attempt on parent, and repeat
 348         # if no successful verification because of lack of parents, request parent
 349         bads = set()
 350         for head in set(self.heads) - set(self.verified.heads):
 351             head_height, last = self.get_height_and_last(head)
 352
 353             for share in self.get_chain(head, head_height if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
 354                 if self.attempt_verify(share):
 355                     break
 356                 if share.hash in self.heads:
 357                     bads.add(share.hash)
 358             else:
 359                 if last is not None:
 360                     desired.add((
 361                         self.items[random.choice(list(self.reverse[last]))].peer,
 362                         last,
 363                         max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 364                         min(x.target for x in self.get_chain(head, min(head_height, 5))),
 365                     ))
 366         for bad in bads:
 367             assert bad not in self.verified.items
 368             assert bad in self.heads
 369             if p2pool.DEBUG:
 370                 print "BAD", bad
 371             self.remove(bad)
 372
 373         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 374         for head in list(self.verified.heads):
 375             head_height, last_hash = self.verified.get_height_and_last(head)
 376             last_height, last_last_hash = self.get_height_and_last(last_hash)
 377             # XXX review boundary conditions
 378             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 379             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 380             get = min(want, can)
 381             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 382             for share in self.get_chain(last_hash, get):
 383                 if not self.attempt_verify(share):
 384                     break
 385             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 386                 desired.add((
 387                     self.items[random.choice(list(self.verified.reverse[last_hash]))].peer,
 388                     last_last_hash,
 389                     max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 390                     min(x.target for x in self.get_chain(head, min(head_height, 5))),
 391                 ))
 392
 393         # decide best tree
 394         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)
 395         if p2pool.DEBUG:
 396             print len(decorated_tails), 'tails:'
 397             for score, tail_hash in decorated_tails:
 398                 print format_hash(tail_hash), score
 399         best_tail_score, best_tail = decorated_tails[-1] if decorated_tails else (None, None)
 400
 401         # decide best verified head
 402         decorated_heads = sorted(((
 403             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 404             #self.items[h].peer is None,
 405             self.items[h].pow_hash <= self.items[h].header['bits'].target, # is block solution
 406             (self.items[h].header['previous_block'], self.items[h].header['bits']) == (previous_block, bits) or self.items[h].peer is None,
 407             -self.items[h].time_seen,
 408         ), h) for h in self.verified.tails.get(best_tail, []))
 409         if p2pool.DEBUG:
 410             print len(decorated_heads), 'heads. Top 10:'
 411             for score, head_hash in decorated_heads[-10:]:
 412                 print '   ', format_hash(head_hash), format_hash(self.items[head_hash].previous_hash), score
 413         best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
 414
 415         # eat away at heads
 416         if decorated_heads:
 417             for i in xrange(1000):
 418                 to_remove = set()
 419                 for share_hash, tail in self.heads.iteritems():
 420                     if share_hash in [head_hash for score, head_hash in decorated_heads[-5:]]:
 421                         #print 1
 422                         continue
 423                     if self.items[share_hash].time_seen > time.time() - 300:
 424                         #print 2
 425                         continue
 426                     if share_hash not in self.verified.items and max(self.items[after_tail_hash].time_seen for after_tail_hash in self.reverse.get(tail)) > time.time() - 120: # XXX stupid
 427                         #print 3
 428                         continue
 429                     to_remove.add(share_hash)
 430                 if not to_remove:
 431                     break
 432                 for share_hash in to_remove:
 433                     if share_hash in self.verified.items:
 434                         self.verified.remove(share_hash)
 435                     self.remove(share_hash)
 436                 #print "_________", to_remove
 437
 438         # drop tails
 439         for i in xrange(1000):
 440             to_remove = set()
 441             for tail, heads in self.tails.iteritems():
 442                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 443                     continue
 444                 for aftertail in self.reverse.get(tail, set()):
 445                     if len(self.reverse[self.items[aftertail].previous_hash]) > 1: # XXX
 446                         print "raw"
 447                         continue
 448                     to_remove.add(aftertail)
 449             if not to_remove:
 450                 break
 451             # if removed from this, it must be removed from verified
 452             #start = time.time()
 453             for aftertail in to_remove:
 454                 if self.items[aftertail].previous_hash not in self.tails:
 455                     print "erk", aftertail, self.items[aftertail].previous_hash
 456                     continue
 457                 if aftertail in self.verified.items:
 458                     self.verified.remove(aftertail)
 459                 self.remove(aftertail)
 460             #end = time.time()
 461             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 462
 463         if best is not None:
 464             best_share = self.items[best]
 465             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:
 466                 if p2pool.DEBUG:
 467                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 468                 best = best_share.previous_hash
 469
 470             timestamp_cutoff = min(int(time.time()), best_share.timestamp) - 3600
 471             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
 472         else:
 473             timestamp_cutoff = int(time.time()) - 24*60*60
 474             target_cutoff = 2**256-1
 475
 476         if p2pool.DEBUG:
 477             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))
 478             for peer, hash, ts, targ in desired:
 479                 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
 480
 481         return best, [(peer, hash) for peer, hash, ts, targ in desired if ts >= timestamp_cutoff]
 482
 483     def score(self, share_hash, block_rel_height_func):
 484         # returns approximate lower bound on chain's hashrate in the last self.net.CHAIN_LENGTH*15//16*self.net.SHARE_PERIOD time
 485
 486         head_height = self.verified.get_height(share_hash)
 487         if head_height < self.net.CHAIN_LENGTH:
 488             return head_height, None
 489
 490         end_point = self.verified.get_nth_parent_hash(share_hash, self.net.CHAIN_LENGTH*15//16)
 491
 492         block_height = max(block_rel_height_func(share.header['previous_block']) for share in
 493             self.verified.get_chain(end_point, self.net.CHAIN_LENGTH//16))
 494
 495         return self.net.CHAIN_LENGTH, self.verified.get_delta(share_hash, end_point).work//((0 - block_height + 1)*self.net.PARENT.BLOCK_PERIOD)
 496
 497 def get_pool_attempts_per_second(tracker, previous_share_hash, dist, min_work=False, integer=False):
 498     assert dist >= 2
 499     near = tracker.items[previous_share_hash]
 500     far = tracker.items[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 501     attempts = tracker.get_delta(near.hash, far.hash).work if not min_work else tracker.get_delta(near.hash, far.hash).min_work
 502     time = near.timestamp - far.timestamp
 503     if time <= 0:
 504         time = 1
 505     if integer:
 506         return attempts//time
 507     return attempts/time
 508
 509 def get_average_stale_prop(tracker, share_hash, lookbehind):
 510     stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] is not None)
 511     return stales/(lookbehind + stales)
 512
 513 def get_stale_counts(tracker, share_hash, lookbehind, rates=False):
 514     res = {}
 515     for share in tracker.get_chain(share_hash, lookbehind - 1):
 516         res['good'] = res.get('good', 0) + bitcoin_data.target_to_average_attempts(share.target)
 517         s = share.share_data['stale_info']
 518         if s is not None:
 519             res[s] = res.get(s, 0) + bitcoin_data.target_to_average_attempts(share.target)
 520     if rates:
 521         dt = tracker.items[share_hash].timestamp - tracker.items[tracker.get_nth_parent_hash(share_hash, lookbehind - 1)].timestamp
 522         res = dict((k, v/dt) for k, v in res.iteritems())
 523     return res
 524
 525 def get_user_stale_props(tracker, share_hash, lookbehind):
 526     res = {}
 527     for share in tracker.get_chain(share_hash, lookbehind - 1):
 528         stale, total = res.get(share.share_data['pubkey_hash'], (0, 0))
 529         total += 1
 530         if share.share_data['stale_info'] is not None:
 531             stale += 1
 532             total += 1
 533         res[share.share_data['pubkey_hash']] = stale, total
 534     return dict((pubkey_hash, stale/total) for pubkey_hash, (stale, total) in res.iteritems())
 535
 536 def get_expected_payouts(tracker, best_share_hash, block_target, subsidy, net):
 537     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))
 538     res = dict((script, subsidy*weight//total_weight) for script, weight in weights.iteritems())
 539     res[DONATION_SCRIPT] = res.get(DONATION_SCRIPT, 0) + subsidy - sum(res.itervalues())
 540     return res
 541
 542 def get_desired_version_counts(tracker, best_share_hash, dist):
 543     res = {}
 544     for share in tracker.get_chain(best_share_hash, dist):
 545         res[share.desired_version] = res.get(share.desired_version, 0) + bitcoin_data.target_to_average_attempts(share.target)
 546     return res
 547
 548 def get_warnings(tracker, best_share, net, bitcoind_warning, bitcoind_work_value):
 549     res = []
 550
 551     desired_version_counts = get_desired_version_counts(tracker, best_share,
 552         min(60*60//net.SHARE_PERIOD, tracker.get_height(best_share)))
 553     majority_desired_version = max(desired_version_counts, key=lambda k: desired_version_counts[k])
 554     if majority_desired_version > 5 and desired_version_counts[majority_desired_version] > sum(desired_version_counts.itervalues())/2:
 555         res.append('A MAJORITY OF SHARES CONTAIN A VOTE FOR AN UNSUPPORTED SHARE IMPLEMENTATION! (v%i with %i%% support)\n'
 556             'An upgrade is likely necessary. Check http://p2pool.forre.st/ for more information.' % (
 557                 majority_desired_version, 100*desired_version_counts[majority_desired_version]/sum(desired_version_counts.itervalues())))
 558
 559     if bitcoind_warning is not None:
 560         res.append('(from bitcoind) %s' % (bitcoind_warning,))
 561
 562     if time.time() > bitcoind_work_value['last_update'] + 60:
 563         res.append('''LOST CONTACT WITH BITCOIND for %s! Check that it isn't frozen or dead!''' % (math.format_dt(time.time() - bitcoind_work_value['last_update']),))
 564
 565     return res
 566
 567 def format_hash(x):
 568     if x is None:
 569         return 'xxxxxxxx'
 570     return '%08x' % (x % 2**32)
 571
 572 class ShareStore(object):
 573     def __init__(self, prefix, net):
 574         self.filename = prefix
 575         self.dirname = os.path.dirname(os.path.abspath(prefix))
 576         self.filename = os.path.basename(os.path.abspath(prefix))
 577         self.net = net
 578         self.known = None # will be filename -> set of share hashes, set of verified hashes
 579         self.known_desired = None
 580
 581     def get_shares(self):
 582         if self.known is not None:
 583             raise AssertionError()
 584         known = {}
 585         filenames, next = self.get_filenames_and_next()
 586         for filename in filenames:
 587             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 588             with open(filename, 'rb') as f:
 589                 for line in f:
 590                     try:
 591                         type_id_str, data_hex = line.strip().split(' ')
 592                         type_id = int(type_id_str)
 593                         if type_id == 0:
 594                             pass
 595                         elif type_id == 1:
 596                             pass
 597                         elif type_id == 2:
 598                             verified_hash = int(data_hex, 16)
 599                             yield 'verified_hash', verified_hash
 600                             verified_hashes.add(verified_hash)
 601                         elif type_id == 5:
 602                             raw_share = share_type.unpack(data_hex.decode('hex'))
 603                             if raw_share['type'] in [0, 1, 2, 3, 6, 7]:
 604                                 continue
 605                             share = load_share(raw_share, self.net, None)
 606                             yield 'share', share
 607                             share_hashes.add(share.hash)
 608                         else:
 609                             raise NotImplementedError("share type %i" % (type_id,))
 610                     except Exception:
 611                         log.err(None, "HARMLESS error while reading saved shares, continuing where left off:")
 612         self.known = known
 613         self.known_desired = dict((k, (set(a), set(b))) for k, (a, b) in known.iteritems())
 614
 615     def _add_line(self, line):
 616         filenames, next = self.get_filenames_and_next()
 617         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 618             filename = filenames[-1]
 619         else:
 620             filename = next
 621
 622         with open(filename, 'ab') as f:
 623             f.write(line + '\n')
 624
 625         return filename
 626
 627     def add_share(self, share):
 628         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 629             if share.hash in share_hashes:
 630                 break
 631         else:
 632             filename = self._add_line("%i %s" % (5, share_type.pack(share.as_share()).encode('hex')))
 633             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 634             share_hashes.add(share.hash)
 635         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 636         share_hashes.add(share.hash)
 637
 638     def add_verified_hash(self, share_hash):
 639         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 640             if share_hash in verified_hashes:
 641                 break
 642         else:
 643             filename = self._add_line("%i %x" % (2, share_hash))
 644             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 645             verified_hashes.add(share_hash)
 646         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 647         verified_hashes.add(share_hash)
 648
 649     def get_filenames_and_next(self):
 650         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())
 651         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)))
 652
 653     def forget_share(self, share_hash):
 654         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 655             if share_hash in share_hashes:
 656                 share_hashes.remove(share_hash)
 657         self.check_remove()
 658
 659     def forget_verified_share(self, share_hash):
 660         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 661             if share_hash in verified_hashes:
 662                 verified_hashes.remove(share_hash)
 663         self.check_remove()
 664
 665     def check_remove(self):
 666         to_remove = set()
 667         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 668             #print filename, len(share_hashes) + len(verified_hashes)
 669             if not share_hashes and not verified_hashes:
 670                 to_remove.add(filename)
 671         for filename in to_remove:
 672             self.known.pop(filename)
 673             self.known_desired.pop(filename)
 674             os.remove(filename)
 675             print "REMOVED", filename