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 share_type = pack.ComposedType([
  37     ('type', pack.VarIntType()),
  38     ('contents', pack.VarStrType()),
  39 ])
  40
  41 def load_share(share, net, peer):
  42     if share['type'] in [0, 1, 2, 3]:
  43         from p2pool import p2p
  44         raise p2p.PeerMisbehavingError('sent an obsolete share')
  45     elif share['type'] == 4:
  46         return Share(net, peer, other_txs=None, **Share.share1a_type.unpack(share['contents']))
  47     elif share['type'] == 5:
  48         share1b = Share.share1b_type.unpack(share['contents'])
  49         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)
  50     elif share['type'] == NewShare.VERSION:
  51         return NewShare(net, peer, NewShare.share_type.unpack(share['contents']))
  52     else:
  53         raise ValueError('unknown share type: %r' % (share['type'],))
  54
  55 DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
  56
  57 class Share(object):
  58     small_block_header_type = pack.ComposedType([
  59         ('version', pack.VarIntType()), # XXX must be constrained to 32 bits
  60         ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
  61         ('timestamp', pack.IntType(32)),
  62         ('bits', bitcoin_data.FloatingIntegerType()),
  63         ('nonce', pack.IntType(32)),
  64     ])
  65
  66     share_data_type = pack.ComposedType([
  67         ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
  68         ('coinbase', pack.VarStrType()),
  69         ('nonce', pack.IntType(32)),
  70         ('pubkey_hash', pack.IntType(160)),
  71         ('subsidy', pack.IntType(64)),
  72         ('donation', pack.IntType(16)),
  73         ('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)))),
  74         ('desired_version', pack.VarIntType()),
  75     ])
  76
  77     share_info_type = pack.ComposedType([
  78         ('share_data', share_data_type),
  79         ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
  80         ('max_bits', bitcoin_data.FloatingIntegerType()),
  81         ('bits', bitcoin_data.FloatingIntegerType()),
  82         ('timestamp', pack.IntType(32)),
  83     ])
  84
  85     share_common_type = pack.ComposedType([
  86         ('min_header', small_block_header_type),
  87         ('share_info', share_info_type),
  88         ('ref_merkle_link', pack.ComposedType([
  89             ('branch', pack.ListType(pack.IntType(256))),
  90             ('index', pack.VarIntType()),
  91         ])),
  92         ('hash_link', hash_link_type),
  93     ])
  94     share1a_type = pack.ComposedType([
  95         ('common', share_common_type),
  96         ('merkle_link', pack.ComposedType([
  97             ('branch', pack.ListType(pack.IntType(256))),
  98             ('index', pack.IntType(0)), # it will always be 0
  99         ])),
 100     ])
 101     share1b_type = pack.ComposedType([
 102         ('common', share_common_type),
 103         ('other_txs', pack.ListType(bitcoin_data.tx_type)),
 104     ])
 105
 106     ref_type = pack.ComposedType([
 107         ('identifier', pack.FixedStrType(64//8)),
 108         ('share_info', share_info_type),
 109     ])
 110
 111     gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(0) + pack.VarStrType().pack('\x20' + pack.IntType(256).pack(0))[:2]
 112
 113     @classmethod
 114     def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, ref_merkle_link, desired_other_transaction_hashes, net, known_txs=None):
 115         previous_share = tracker.items[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
 116
 117         height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
 118         assert height >= net.REAL_CHAIN_LENGTH or last is None
 119         if height < net.TARGET_LOOKBEHIND:
 120             pre_target3 = net.MAX_TARGET
 121         else:
 122             attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
 123             pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
 124             pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
 125             pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 126         max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 127         bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
 128
 129         weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
 130             min(height, net.REAL_CHAIN_LENGTH),
 131             65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
 132         )
 133         assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 134
 135         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
 136         this_script = bitcoin_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
 137         amounts[this_script] = amounts.get(this_script, 0) + share_data['subsidy']//200 # 0.5% goes to block finder
 138         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
 139
 140         if sum(amounts.itervalues()) != share_data['subsidy'] or any(x < 0 for x in amounts.itervalues()):
 141             raise ValueError()
 142
 143         dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
 144
 145         share_info = dict(
 146             share_data=share_data,
 147             far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
 148             max_bits=max_bits,
 149             bits=bits,
 150             timestamp=math.clip(desired_timestamp, (
 151                 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
 152                 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
 153             )) if previous_share is not None else desired_timestamp,
 154         )
 155
 156         gentx = dict(
 157             version=1,
 158             tx_ins=[dict(
 159                 previous_output=None,
 160                 sequence=None,
 161                 script=share_data['coinbase'].ljust(2, '\x00'),
 162             )],
 163             tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script] or script == DONATION_SCRIPT] + [dict(
 164                 value=0,
 165                 script='\x20' + cls.get_ref_hash(net, share_info, ref_merkle_link),
 166             )],
 167             lock_time=0,
 168         )
 169
 170         def get_share(header, transactions):
 171             assert transactions[0] == gentx and [bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx)) for tx in transactions[1:]] == desired_other_transaction_hashes
 172             min_header = dict(header);del min_header['merkle_root']
 173             hash_link = prefix_to_hash_link(bitcoin_data.tx_type.pack(gentx)[:-32-4], cls.gentx_before_refhash)
 174             merkle_link = bitcoin_data.calculate_merkle_link([None] + desired_other_transaction_hashes, 0)
 175             pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(header))
 176             return cls(net, None, dict(
 177                 min_header=min_header, share_info=share_info, hash_link=hash_link,
 178                 ref_merkle_link=dict(branch=[], index=0),
 179             ), merkle_link=merkle_link, other_txs=transactions[1:] if pow_hash <= header['bits'].target else None)
 180
 181         return share_info, gentx, desired_other_transaction_hashes, get_share
 182
 183     @classmethod
 184     def get_ref_hash(cls, net, share_info, ref_merkle_link):
 185         return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
 186             identifier=net.IDENTIFIER,
 187             share_info=share_info,
 188         ))), ref_merkle_link))
 189
 190     __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 new_transaction_hashes time_seen'.split(' ')
 191
 192     def __init__(self, net, peer, common, merkle_link, other_txs):
 193         self.net = net
 194         self.peer = peer
 195         self.common = common
 196         self.min_header = common['min_header']
 197         self.share_info = common['share_info']
 198         self.hash_link = common['hash_link']
 199         self.merkle_link = merkle_link
 200         self.other_txs = other_txs
 201
 202         if len(self.share_info['share_data']['coinbase']) > 100:
 203             raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_info['share_data']['coinbase']),))
 204
 205         if len(merkle_link['branch']) > 16:
 206             raise ValueError('merkle branch too long!')
 207
 208         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:
 209             raise ValueError('merkle_link and other_txs do not match')
 210
 211         assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
 212
 213         self.share_data = self.share_info['share_data']
 214         self.max_target = self.share_info['max_bits'].target
 215         self.target = self.share_info['bits'].target
 216         self.timestamp = self.share_info['timestamp']
 217         self.previous_hash = self.share_data['previous_share_hash']
 218         self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
 219         self.desired_version = self.share_data['desired_version']
 220
 221         self.gentx_hash = check_hash_link(
 222             self.hash_link,
 223             self.get_ref_hash(net, self.share_info, common['ref_merkle_link']) + pack.IntType(32).pack(0),
 224             self.gentx_before_refhash,
 225         )
 226         merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, merkle_link)
 227         self.header = dict(self.min_header, merkle_root=merkle_root)
 228         self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
 229         self.hash = self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
 230
 231         if self.pow_hash > self.target:
 232             from p2pool import p2p
 233             raise p2p.PeerMisbehavingError('share PoW invalid')
 234
 235         if other_txs is not None and not self.pow_hash <= self.header['bits'].target:
 236             raise ValueError('other_txs provided when not a block solution')
 237         if other_txs is None and self.pow_hash <= self.header['bits'].target:
 238             raise ValueError('other_txs not provided when a block solution')
 239
 240         self.new_transaction_hashes = []
 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         if self.share_data['previous_share_hash'] is not None:
 262             previous_share = tracker.items[self.share_data['previous_share_hash']]
 263             if isinstance(previous_share, NewShare):
 264                 from p2pool import p2p
 265                 raise p2p.PeerMisbehavingError('''Share can't follow NewShare''')
 266         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
 267         if share_info != self.share_info:
 268             raise ValueError('share_info invalid')
 269         if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
 270             raise ValueError('''gentx doesn't match hash_link''')
 271         return gentx # only used by as_block
 272
 273     def get_other_tx_hashes(self, tracker):
 274         return []
 275
 276     def get_other_txs(self, tracker, known_txs):
 277         return []
 278
 279     def get_other_txs_size(self, tracker, known_txs):
 280         return 0
 281
 282     def get_new_txs_size(self, known_txs):
 283         return 0
 284
 285     def as_block(self, tracker, known_txs):
 286         if self.other_txs is None:
 287             raise ValueError('share does not contain all txs')
 288         return dict(header=self.header, txs=[self.check(tracker)] + self.other_txs)
 289
 290 class NewShare(object):
 291     VERSION = 8
 292
 293     other_txs = None
 294
 295     small_block_header_type = pack.ComposedType([
 296         ('version', pack.VarIntType()),
 297         ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
 298         ('timestamp', pack.IntType(32)),
 299         ('bits', bitcoin_data.FloatingIntegerType()),
 300         ('nonce', pack.IntType(32)),
 301     ])
 302
 303     share_info_type = pack.ComposedType([
 304         ('share_data', pack.ComposedType([
 305             ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 306             ('coinbase', pack.VarStrType()),
 307             ('nonce', pack.IntType(32)),
 308             ('pubkey_hash', pack.IntType(160)),
 309             ('subsidy', pack.IntType(64)),
 310             ('donation', pack.IntType(16)),
 311             ('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)))),
 312             ('desired_version', pack.VarIntType()),
 313         ])),
 314         ('new_transaction_hashes', pack.ListType(pack.IntType(256))),
 315         ('transaction_hash_refs', pack.ListType(pack.ComposedType([ # compressed by referencing previous shares' hashes
 316             ('share_count', pack.VarIntType()),
 317             ('tx_count', pack.VarIntType()),
 318         ]))),
 319         ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 320         ('max_bits', bitcoin_data.FloatingIntegerType()),
 321         ('bits', bitcoin_data.FloatingIntegerType()),
 322         ('timestamp', pack.IntType(32)),
 323     ])
 324
 325     share_type = pack.ComposedType([
 326         ('min_header', small_block_header_type),
 327         ('share_info', share_info_type),
 328         ('ref_merkle_link', pack.ComposedType([
 329             ('branch', pack.ListType(pack.IntType(256))),
 330             ('index', pack.IntType(0)),
 331         ])),
 332         ('hash_link', hash_link_type),
 333         ('merkle_link', pack.ComposedType([
 334             ('branch', pack.ListType(pack.IntType(256))),
 335             ('index', pack.IntType(0)), # it will always be 0
 336         ])),
 337     ])
 338
 339     ref_type = pack.ComposedType([
 340         ('identifier', pack.FixedStrType(64//8)),
 341         ('share_info', share_info_type),
 342     ])
 343
 344     gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(0) + pack.VarStrType().pack('\x20' + pack.IntType(256).pack(0))[:2]
 345
 346     @classmethod
 347     def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, ref_merkle_link, desired_other_transaction_hashes, net, known_txs=None):
 348         previous_share = tracker.items[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
 349
 350         height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
 351         assert height >= net.REAL_CHAIN_LENGTH or last is None
 352         if height < net.TARGET_LOOKBEHIND:
 353             pre_target3 = net.MAX_TARGET
 354         else:
 355             attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
 356             pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
 357             pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
 358             pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 359         max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 360         bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
 361
 362         weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
 363             min(height, net.REAL_CHAIN_LENGTH),
 364             65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
 365         )
 366         assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
 367
 368         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
 369         this_script = bitcoin_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
 370         amounts[this_script] = amounts.get(this_script, 0) + share_data['subsidy']//200 # 0.5% goes to block finder
 371         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
 372
 373         if sum(amounts.itervalues()) != share_data['subsidy'] or any(x < 0 for x in amounts.itervalues()):
 374             raise ValueError()
 375
 376         dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
 377
 378         new_transaction_hashes = []
 379         new_transaction_size = 0
 380         transaction_hash_refs = []
 381         other_transaction_hashes = []
 382
 383         for tx_hash in desired_other_transaction_hashes:
 384             for i, share in enumerate(tracker.get_chain(share_data['previous_share_hash'], min(height, 100))):
 385                 if tx_hash in share.new_transaction_hashes:
 386                     this = dict(share_count=i+1, tx_count=share.new_transaction_hashes.index(tx_hash))
 387                     break
 388             else:
 389                 if known_txs is not None:
 390                     this_size = len(bitcoin_data.tx_type.pack(known_txs[tx_hash]))
 391                     if new_transaction_size + this_size > 50000: # only allow 50 kB of new txns/share
 392                         break
 393                     new_transaction_size += this_size
 394                 new_transaction_hashes.append(tx_hash)
 395                 this = dict(share_count=0, tx_count=len(new_transaction_hashes)-1)
 396             transaction_hash_refs.append(this)
 397             other_transaction_hashes.append(tx_hash)
 398
 399         share_info = dict(
 400             share_data=share_data,
 401             far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
 402             max_bits=max_bits,
 403             bits=bits,
 404             timestamp=math.clip(desired_timestamp, (
 405                 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
 406                 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
 407             )) if previous_share is not None else desired_timestamp,
 408             new_transaction_hashes=new_transaction_hashes,
 409             transaction_hash_refs=transaction_hash_refs,
 410         )
 411
 412         gentx = dict(
 413             version=1,
 414             tx_ins=[dict(
 415                 previous_output=None,
 416                 sequence=None,
 417                 script=share_data['coinbase'],
 418             )],
 419             tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script] or script == DONATION_SCRIPT] + [dict(
 420                 value=0,
 421                 script='\x20' + cls.get_ref_hash(net, share_info, ref_merkle_link),
 422             )],
 423             lock_time=0,
 424         )
 425
 426         def get_share(header, transactions):
 427             min_header=dict(header);del min_header['merkle_root']
 428             return cls(net, None, dict(
 429                 min_header=min_header,
 430                 share_info=share_info,
 431                 ref_merkle_link=dict(branch=[], index=0),
 432                 hash_link=prefix_to_hash_link(bitcoin_data.tx_type.pack(gentx)[:-32-4], cls.gentx_before_refhash),
 433                 merkle_link=bitcoin_data.calculate_merkle_link([None] + other_transaction_hashes, 0),
 434             ))
 435
 436         return share_info, gentx, other_transaction_hashes, get_share
 437
 438     @classmethod
 439     def get_ref_hash(cls, net, share_info, ref_merkle_link):
 440         return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
 441             identifier=net.IDENTIFIER,
 442             share_info=share_info,
 443         ))), ref_merkle_link))
 444
 445     __slots__ = 'net peer contents min_header share_info hash_link merkle_link hash share_data max_target target timestamp previous_hash new_script desired_version gentx_hash header pow_hash header_hash new_transaction_hashes time_seen'.split(' ')
 446
 447     def __init__(self, net, peer, contents):
 448         self.net = net
 449         self.peer = peer
 450         self.contents = contents
 451
 452         self.min_header = contents['min_header']
 453         self.share_info = contents['share_info']
 454         self.hash_link = contents['hash_link']
 455         self.merkle_link = contents['merkle_link']
 456
 457         if not (2 <= len(self.share_info['share_data']['coinbase']) <= 100):
 458             raise ValueError('''bad coinbase size! %i bytes''' % (len(self.share_info['share_data']['coinbase']),))
 459
 460         if len(self.merkle_link['branch']) > 16:
 461             raise ValueError('merkle branch too long!')
 462
 463         assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
 464
 465         self.share_data = self.share_info['share_data']
 466         self.max_target = self.share_info['max_bits'].target
 467         self.target = self.share_info['bits'].target
 468         self.timestamp = self.share_info['timestamp']
 469         self.previous_hash = self.share_data['previous_share_hash']
 470         self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
 471         self.desired_version = self.share_data['desired_version']
 472
 473         for x in self.share_info['transaction_hash_refs']:
 474             assert x['share_count'] < 110
 475         for i, x in enumerate(self.share_info['new_transaction_hashes']):
 476             assert dict(share_count=0, tx_count=i) in self.share_info['transaction_hash_refs']
 477
 478         self.gentx_hash = check_hash_link(
 479             self.hash_link,
 480             self.get_ref_hash(net, self.share_info, contents['ref_merkle_link']) + pack.IntType(32).pack(0),
 481             self.gentx_before_refhash,
 482         )
 483         merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, self.merkle_link)
 484         self.header = dict(self.min_header, merkle_root=merkle_root)
 485         self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
 486         self.hash = self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
 487
 488         if self.target > net.MAX_TARGET:
 489             from p2pool import p2p
 490             raise p2p.PeerMisbehavingError('share target invalid')
 491
 492         if self.pow_hash > self.target:
 493             from p2pool import p2p
 494             raise p2p.PeerMisbehavingError('share PoW invalid')
 495
 496         self.new_transaction_hashes = self.share_info['new_transaction_hashes']
 497
 498         # XXX eww
 499         self.time_seen = time.time()
 500
 501     def __repr__(self):
 502         return 'Share' + repr((self.net, self.peer, self.contents))
 503
 504     def as_share(self):
 505         return dict(type=self.VERSION, contents=self.share_type.pack(self.contents))
 506
 507     def check(self, tracker):
 508         if self.share_data['previous_share_hash'] is not None:
 509             previous_share = tracker.items[self.share_data['previous_share_hash']]
 510             if isinstance(previous_share, Share):
 511                 if tracker.get_height(previous_share.hash) < self.net.CHAIN_LENGTH:
 512                     from p2pool import p2p
 513                     raise p2p.PeerMisbehavingError('NewShare without enough history')
 514                 else:
 515                     # Share -> NewShare only valid if 85% of hashes in [self.net.CHAIN_LENGTH*9//10, self.net.CHAIN_LENGTH] for new version
 516                     counts = get_desired_version_counts(tracker,
 517                         tracker.get_nth_parent_hash(previous_share.hash, self.net.CHAIN_LENGTH*9//10), self.net.CHAIN_LENGTH//10)
 518                     if counts.get(self.VERSION, 0) < sum(counts.itervalues())*85//100:
 519                         from p2pool import p2p
 520                         raise p2p.PeerMisbehavingError('NewShare without enough hash power upgraded')
 521
 522         other_tx_hashes = [tracker.items[tracker.get_nth_parent_hash(self.hash, x['share_count'])].share_info['new_transaction_hashes'][x['tx_count']] for x in self.share_info['transaction_hash_refs']]
 523
 524         share_info, gentx, other_tx_hashes2, 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.contents['ref_merkle_link'], other_tx_hashes, self.net)
 525         assert other_tx_hashes2 == other_tx_hashes
 526         if share_info != self.share_info:
 527             raise ValueError('share_info invalid')
 528         if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
 529             raise ValueError('''gentx doesn't match hash_link''')
 530
 531         if bitcoin_data.calculate_merkle_link([None] + other_tx_hashes, 0) != self.merkle_link:
 532             raise ValueError('merkle_link and other_tx_hashes do not match')
 533
 534         return gentx # only used by as_block
 535
 536     def get_other_tx_hashes(self, tracker):
 537         return [tracker.items[tracker.get_nth_parent_hash(self.hash, x['share_count'])].share_info['new_transaction_hashes'][x['tx_count']] for x in self.share_info['transaction_hash_refs']]
 538
 539     def get_other_txs(self, tracker, known_txs):
 540         other_tx_hashes = self.get_other_tx_hashes(tracker)
 541
 542         if not all(tx_hash in known_txs for tx_hash in other_tx_hashes):
 543             return None # not all txs present
 544
 545         return [known_txs[tx_hash] for tx_hash in other_tx_hashes]
 546
 547     def get_other_txs_size(self, tracker, known_txs):
 548         other_txs = self.get_other_txs(tracker, known_txs)
 549         if other_txs is None:
 550             return None # not all txs present
 551         size = sum(len(bitcoin_data.tx_type.pack(tx)) for tx in other_txs)
 552
 553     def get_new_txs_size(self, known_txs):
 554         if not all(tx_hash in known_txs for tx_hash in self.share_info['new_transaction_hashes']):
 555             return None # not all txs present
 556         return sum(len(bitcoin_data.tx_type.pack(known_txs[tx_hash])) for tx_hash in self.share_info['new_transaction_hashes'])
 557
 558     def as_block(self, tracker, known_txs):
 559         other_txs = self.get_other_txs(tracker, known_txs)
 560         if other_txs is None:
 561             return None # not all txs present
 562         return dict(header=self.header, txs=[self.check(tracker)] + other_txs)
 563
 564
 565 class WeightsSkipList(forest.TrackerSkipList):
 566     # share_count, weights, total_weight
 567
 568     def get_delta(self, element):
 569         from p2pool.bitcoin import data as bitcoin_data
 570         share = self.tracker.items[element]
 571         att = bitcoin_data.target_to_average_attempts(share.target)
 572         return 1, {share.new_script: att*(65535-share.share_data['donation'])}, att*65535, att*share.share_data['donation']
 573
 574     def combine_deltas(self, (share_count1, weights1, total_weight1, total_donation_weight1), (share_count2, weights2, total_weight2, total_donation_weight2)):
 575         return share_count1 + share_count2, math.add_dicts(weights1, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 576
 577     def initial_solution(self, start, (max_shares, desired_weight)):
 578         assert desired_weight % 65535 == 0, divmod(desired_weight, 65535)
 579         return 0, None, 0, 0
 580
 581     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)):
 582         if total_weight1 + total_weight2 > desired_weight and share_count2 == 1:
 583             assert (desired_weight - total_weight1) % 65535 == 0
 584             script, = weights2.iterkeys()
 585             new_weights = {script: (desired_weight - total_weight1)//65535*weights2[script]//(total_weight2//65535)}
 586             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)
 587         return share_count1 + share_count2, (weights_list, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
 588
 589     def judge(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
 590         if share_count > max_shares or total_weight > desired_weight:
 591             return 1
 592         elif share_count == max_shares or total_weight == desired_weight:
 593             return 0
 594         else:
 595             return -1
 596
 597     def finalize(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
 598         assert share_count <= max_shares and total_weight <= desired_weight
 599         assert share_count == max_shares or total_weight == desired_weight
 600         return math.add_dicts(*math.flatten_linked_list(weights_list)), total_weight, total_donation_weight
 601
 602 class OkayTracker(forest.Tracker):
 603     def __init__(self, net, my_share_hashes, my_doa_share_hashes):
 604         forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 605             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 606             min_work=lambda share: bitcoin_data.target_to_average_attempts(share.max_target),
 607         )))
 608         self.net = net
 609         self.verified = forest.Tracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
 610             work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
 611             my_count=lambda share: 1 if share.hash in my_share_hashes else 0,
 612             my_doa_count=lambda share: 1 if share.hash in my_doa_share_hashes else 0,
 613             my_orphan_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 'orphan' else 0,
 614             my_dead_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 'doa' else 0,
 615         )), subset_of=self)
 616         self.get_cumulative_weights = WeightsSkipList(self)
 617
 618     def attempt_verify(self, share):
 619         if share.hash in self.verified.items:
 620             return True
 621         height, last = self.get_height_and_last(share.hash)
 622         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 623             raise AssertionError()
 624         try:
 625             share.check(self)
 626         except:
 627             log.err(None, 'Share check failed:')
 628             return False
 629         else:
 630             self.verified.add(share)
 631             return True
 632
 633     def think(self, block_rel_height_func, previous_block, bits, known_txs):
 634         desired = set()
 635
 636         # O(len(self.heads))
 637         #   make 'unverified heads' set?
 638         # for each overall head, attempt verification
 639         # if it fails, attempt on parent, and repeat
 640         # if no successful verification because of lack of parents, request parent
 641         bads = set()
 642         for head in set(self.heads) - set(self.verified.heads):
 643             head_height, last = self.get_height_and_last(head)
 644
 645             for share in self.get_chain(head, head_height if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
 646                 if self.attempt_verify(share):
 647                     break
 648                 if share.hash in self.heads:
 649                     bads.add(share.hash)
 650             else:
 651                 if last is not None:
 652                     desired.add((
 653                         self.items[random.choice(list(self.reverse[last]))].peer,
 654                         last,
 655                         max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 656                         min(x.target for x in self.get_chain(head, min(head_height, 5))),
 657                     ))
 658         for bad in bads:
 659             assert bad not in self.verified.items
 660             assert bad in self.heads
 661             if p2pool.DEBUG:
 662                 print "BAD", bad
 663             self.remove(bad)
 664
 665         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 666         for head in list(self.verified.heads):
 667             head_height, last_hash = self.verified.get_height_and_last(head)
 668             last_height, last_last_hash = self.get_height_and_last(last_hash)
 669             # XXX review boundary conditions
 670             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 671             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 672             get = min(want, can)
 673             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 674             for share in self.get_chain(last_hash, get):
 675                 if not self.attempt_verify(share):
 676                     break
 677             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 678                 desired.add((
 679                     self.items[random.choice(list(self.verified.reverse[last_hash]))].peer,
 680                     last_last_hash,
 681                     max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
 682                     min(x.target for x in self.get_chain(head, min(head_height, 5))),
 683                 ))
 684
 685         # decide best tree
 686         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)
 687         if p2pool.DEBUG:
 688             print len(decorated_tails), 'tails:'
 689             for score, tail_hash in decorated_tails:
 690                 print format_hash(tail_hash), score
 691         best_tail_score, best_tail = decorated_tails[-1] if decorated_tails else (None, None)
 692
 693         # decide best verified head
 694         decorated_heads = sorted(((
 695             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 696             #self.items[h].peer is None,
 697             self.items[h].pow_hash <= self.items[h].header['bits'].target, # is block solution
 698             (self.items[h].header['previous_block'], self.items[h].header['bits']) == (previous_block, bits) or self.items[h].peer is None,
 699             self.items[h].get_other_txs(self, known_txs) is not None,
 700             self.items[h].get_other_txs_size(self, known_txs) < 1000000,
 701             self.items[h].get_new_txs_size(known_txs) < 50000,
 702             -self.items[h].time_seen,
 703         ), h) for h in self.verified.tails.get(best_tail, []))
 704         if p2pool.DEBUG:
 705             print len(decorated_heads), 'heads. Top 10:'
 706             for score, head_hash in decorated_heads[-10:]:
 707                 print '   ', format_hash(head_hash), format_hash(self.items[head_hash].previous_hash), score
 708         best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
 709
 710         # eat away at heads
 711         if decorated_heads:
 712             for i in xrange(1000):
 713                 to_remove = set()
 714                 for share_hash, tail in self.heads.iteritems():
 715                     if share_hash in [head_hash for score, head_hash in decorated_heads[-5:]]:
 716                         #print 1
 717                         continue
 718                     if self.items[share_hash].time_seen > time.time() - 300:
 719                         #print 2
 720                         continue
 721                     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
 722                         #print 3
 723                         continue
 724                     to_remove.add(share_hash)
 725                 if not to_remove:
 726                     break
 727                 for share_hash in to_remove:
 728                     if share_hash in self.verified.items:
 729                         self.verified.remove(share_hash)
 730                     self.remove(share_hash)
 731                 #print "_________", to_remove
 732
 733         # drop tails
 734         for i in xrange(1000):
 735             to_remove = set()
 736             for tail, heads in self.tails.iteritems():
 737                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 738                     continue
 739                 for aftertail in self.reverse.get(tail, set()):
 740                     if len(self.reverse[self.items[aftertail].previous_hash]) > 1: # XXX
 741                         print "raw"
 742                         continue
 743                     to_remove.add(aftertail)
 744             if not to_remove:
 745                 break
 746             # if removed from this, it must be removed from verified
 747             #start = time.time()
 748             for aftertail in to_remove:
 749                 if self.items[aftertail].previous_hash not in self.tails:
 750                     print "erk", aftertail, self.items[aftertail].previous_hash
 751                     continue
 752                 if aftertail in self.verified.items:
 753                     self.verified.remove(aftertail)
 754                 self.remove(aftertail)
 755             #end = time.time()
 756             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 757
 758         if best is not None:
 759             best_share = self.items[best]
 760             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:
 761                 if p2pool.DEBUG:
 762                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 763                 best = best_share.previous_hash
 764             elif best_share.get_other_txs(self, known_txs) is None:
 765                 print 'Share with incomplete transactions detected! Jumping from %s to %s!' % (format_hash(best), format_hash(best_share.previous_hash))
 766                 best = best_share.previous_hash
 767             elif best_share.get_other_txs_size(self, known_txs) > 1000000:
 768                 print >>sys.stderr, 'Share with too many transactions detected! Jumping from %s to %s!' % (format_hash(best), format_hash(best_share.previous_hash))
 769                 best = best_share.previous_hash
 770             elif best_share.get_new_txs_size(known_txs) > 50000:
 771                 print >>sys.stderr, 'Share with too many new transactions detected! Jumping from %s to %s!' % (format_hash(best), format_hash(best_share.previous_hash))
 772                 best = best_share.previous_hash
 773
 774             timestamp_cutoff = min(int(time.time()), best_share.timestamp) - 3600
 775             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
 776         else:
 777             timestamp_cutoff = int(time.time()) - 24*60*60
 778             target_cutoff = 2**256-1
 779
 780         if p2pool.DEBUG:
 781             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))
 782             for peer, hash, ts, targ in desired:
 783                 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
 784
 785         return best, [(peer, hash) for peer, hash, ts, targ in desired if ts >= timestamp_cutoff]
 786
 787     def score(self, share_hash, block_rel_height_func):
 788         # returns approximate lower bound on chain's hashrate in the last self.net.CHAIN_LENGTH*15//16*self.net.SHARE_PERIOD time
 789
 790         head_height = self.verified.get_height(share_hash)
 791         if head_height < self.net.CHAIN_LENGTH:
 792             return head_height, None
 793
 794         end_point = self.verified.get_nth_parent_hash(share_hash, self.net.CHAIN_LENGTH*15//16)
 795
 796         block_height = max(block_rel_height_func(share.header['previous_block']) for share in
 797             self.verified.get_chain(end_point, self.net.CHAIN_LENGTH//16))
 798
 799         return self.net.CHAIN_LENGTH, self.verified.get_delta(share_hash, end_point).work//((0 - block_height + 1)*self.net.PARENT.BLOCK_PERIOD)
 800
 801 def get_pool_attempts_per_second(tracker, previous_share_hash, dist, min_work=False, integer=False):
 802     assert dist >= 2
 803     near = tracker.items[previous_share_hash]
 804     far = tracker.items[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 805     attempts = tracker.get_delta(near.hash, far.hash).work if not min_work else tracker.get_delta(near.hash, far.hash).min_work
 806     time = near.timestamp - far.timestamp
 807     if time <= 0:
 808         time = 1
 809     if integer:
 810         return attempts//time
 811     return attempts/time
 812
 813 def get_average_stale_prop(tracker, share_hash, lookbehind):
 814     stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] is not None)
 815     return stales/(lookbehind + stales)
 816
 817 def get_stale_counts(tracker, share_hash, lookbehind, rates=False):
 818     res = {}
 819     for share in tracker.get_chain(share_hash, lookbehind - 1):
 820         res['good'] = res.get('good', 0) + bitcoin_data.target_to_average_attempts(share.target)
 821         s = share.share_data['stale_info']
 822         if s is not None:
 823             res[s] = res.get(s, 0) + bitcoin_data.target_to_average_attempts(share.target)
 824     if rates:
 825         dt = tracker.items[share_hash].timestamp - tracker.items[tracker.get_nth_parent_hash(share_hash, lookbehind - 1)].timestamp
 826         res = dict((k, v/dt) for k, v in res.iteritems())
 827     return res
 828
 829 def get_user_stale_props(tracker, share_hash, lookbehind):
 830     res = {}
 831     for share in tracker.get_chain(share_hash, lookbehind - 1):
 832         stale, total = res.get(share.share_data['pubkey_hash'], (0, 0))
 833         total += 1
 834         if share.share_data['stale_info'] is not None:
 835             stale += 1
 836             total += 1
 837         res[share.share_data['pubkey_hash']] = stale, total
 838     return dict((pubkey_hash, stale/total) for pubkey_hash, (stale, total) in res.iteritems())
 839
 840 def get_expected_payouts(tracker, best_share_hash, block_target, subsidy, net):
 841     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))
 842     res = dict((script, subsidy*weight//total_weight) for script, weight in weights.iteritems())
 843     res[DONATION_SCRIPT] = res.get(DONATION_SCRIPT, 0) + subsidy - sum(res.itervalues())
 844     return res
 845
 846 def get_desired_version_counts(tracker, best_share_hash, dist):
 847     res = {}
 848     for share in tracker.get_chain(best_share_hash, dist):
 849         res[share.desired_version] = res.get(share.desired_version, 0) + bitcoin_data.target_to_average_attempts(share.target)
 850     return res
 851
 852 def get_warnings(tracker, best_share, net, bitcoind_warning, bitcoind_work_value):
 853     res = []
 854
 855     desired_version_counts = get_desired_version_counts(tracker, best_share,
 856         min(net.CHAIN_LENGTH, 60*60//net.SHARE_PERIOD, tracker.get_height(best_share)))
 857     majority_desired_version = max(desired_version_counts, key=lambda k: desired_version_counts[k])
 858     if majority_desired_version > NewShare.VERSION and desired_version_counts[majority_desired_version] > sum(desired_version_counts.itervalues())/2:
 859         res.append('A MAJORITY OF SHARES CONTAIN A VOTE FOR AN UNSUPPORTED SHARE IMPLEMENTATION! (v%i with %i%% support)\n'
 860             'An upgrade is likely necessary. Check http://p2pool.forre.st/ for more information.' % (
 861                 majority_desired_version, 100*desired_version_counts[majority_desired_version]/sum(desired_version_counts.itervalues())))
 862
 863     if bitcoind_warning is not None:
 864         res.append('(from bitcoind) %s' % (bitcoind_warning,))
 865
 866     if time.time() > bitcoind_work_value['last_update'] + 60:
 867         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']),))
 868
 869     return res
 870
 871 def format_hash(x):
 872     if x is None:
 873         return 'xxxxxxxx'
 874     return '%08x' % (x % 2**32)
 875
 876 class ShareStore(object):
 877     def __init__(self, prefix, net):
 878         self.filename = prefix
 879         self.dirname = os.path.dirname(os.path.abspath(prefix))
 880         self.filename = os.path.basename(os.path.abspath(prefix))
 881         self.net = net
 882         self.known = None # will be filename -> set of share hashes, set of verified hashes
 883         self.known_desired = None
 884
 885     def get_shares(self):
 886         if self.known is not None:
 887             raise AssertionError()
 888         known = {}
 889         filenames, next = self.get_filenames_and_next()
 890         for filename in filenames:
 891             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 892             with open(filename, 'rb') as f:
 893                 for line in f:
 894                     try:
 895                         type_id_str, data_hex = line.strip().split(' ')
 896                         type_id = int(type_id_str)
 897                         if type_id == 0:
 898                             pass
 899                         elif type_id == 1:
 900                             pass
 901                         elif type_id == 2:
 902                             verified_hash = int(data_hex, 16)
 903                             yield 'verified_hash', verified_hash
 904                             verified_hashes.add(verified_hash)
 905                         elif type_id == 5:
 906                             raw_share = share_type.unpack(data_hex.decode('hex'))
 907                             if raw_share['type'] in [0, 1, 2, 3, 6, 7]:
 908                                 continue
 909                             share = load_share(raw_share, self.net, None)
 910                             yield 'share', share
 911                             share_hashes.add(share.hash)
 912                         else:
 913                             raise NotImplementedError("share type %i" % (type_id,))
 914                     except Exception:
 915                         log.err(None, "HARMLESS error while reading saved shares, continuing where left off:")
 916         self.known = known
 917         self.known_desired = dict((k, (set(a), set(b))) for k, (a, b) in known.iteritems())
 918
 919     def _add_line(self, line):
 920         filenames, next = self.get_filenames_and_next()
 921         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 922             filename = filenames[-1]
 923         else:
 924             filename = next
 925
 926         with open(filename, 'ab') as f:
 927             f.write(line + '\n')
 928
 929         return filename
 930
 931     def add_share(self, share):
 932         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 933             if share.hash in share_hashes:
 934                 break
 935         else:
 936             filename = self._add_line("%i %s" % (5, share_type.pack(share.as_share()).encode('hex')))
 937             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 938             share_hashes.add(share.hash)
 939         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 940         share_hashes.add(share.hash)
 941
 942     def add_verified_hash(self, share_hash):
 943         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 944             if share_hash in verified_hashes:
 945                 break
 946         else:
 947             filename = self._add_line("%i %x" % (2, share_hash))
 948             share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 949             verified_hashes.add(share_hash)
 950         share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
 951         verified_hashes.add(share_hash)
 952
 953     def get_filenames_and_next(self):
 954         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())
 955         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)))
 956
 957     def forget_share(self, share_hash):
 958         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 959             if share_hash in share_hashes:
 960                 share_hashes.remove(share_hash)
 961         self.check_remove()
 962
 963     def forget_verified_share(self, share_hash):
 964         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 965             if share_hash in verified_hashes:
 966                 verified_hashes.remove(share_hash)
 967         self.check_remove()
 968
 969     def check_remove(self):
 970         to_remove = set()
 971         for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
 972             #print filename, len(share_hashes) + len(verified_hashes)
 973             if not share_hashes and not verified_hashes:
 974                 to_remove.add(filename)
 975         for filename in to_remove:
 976             self.known.pop(filename)
 977             self.known_desired.pop(filename)
 978             os.remove(filename)
 979             print "REMOVED", filename