1 from __future__ import division
8 from math import floor, ceil
10 from twisted.python import log
13 from p2pool.bitcoin import data as bitcoin_data, script, sha256
14 from p2pool.util import math, forest, pack
16 minout = pow(10, 6) / 100;
20 hash_link_type = pack.ComposedType([
21 ('state', pack.FixedStrType(32)),
22 ('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
23 ('length', pack.VarIntType()),
26 def prefix_to_hash_link(prefix, const_ending=''):
27 assert prefix.endswith(const_ending), (prefix, const_ending)
28 x = sha256.sha256(prefix)
29 return dict(state=x.state, extra_data=x.buf[:max(0, len(x.buf)-len(const_ending))], length=x.length//8)
31 def check_hash_link(hash_link, data, const_ending=''):
32 extra_length = hash_link['length'] % (512//8)
33 assert len(hash_link['extra_data']) == max(0, extra_length - len(const_ending))
34 extra = (hash_link['extra_data'] + const_ending)[len(hash_link['extra_data']) + len(const_ending) - extra_length:]
35 assert len(extra) == extra_length
36 return pack.IntType(256).unpack(hashlib.sha256(sha256.sha256(data, (hash_link['state'], extra, 8*hash_link['length'])).digest()).digest())
40 share_type = pack.ComposedType([
41 ('type', pack.VarIntType()),
42 ('contents', pack.VarStrType()),
45 def load_share(share, net, peer_addr):
46 assert peer_addr is None or isinstance(peer_addr, tuple)
47 if share['type'] in [0, 1, 2, 3, 4, 5, 6, 7, 8]:
48 from p2pool import p2p
49 raise p2p.PeerMisbehavingError('sent an obsolete share')
50 elif share['type'] == Share.VERSION:
51 return Share(net, peer_addr, Share.share_type.unpack(share['contents']))
53 raise ValueError('unknown share type: %r' % (share['type'],))
55 DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
63 small_block_header_type = pack.ComposedType([
64 ('version', pack.VarIntType()),
65 ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
66 ('timestamp', pack.IntType(32)),
67 ('bits', bitcoin_data.FloatingIntegerType()),
68 ('nonce', pack.IntType(32)),
71 share_info_type = pack.ComposedType([
72 ('share_data', pack.ComposedType([
73 ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
74 ('coinbase', pack.VarStrType()),
75 ('nonce', pack.IntType(32)),
76 ('pubkey', pack.FixedStrType(33)),
77 ('subsidy', pack.IntType(64)),
78 ('donation', pack.IntType(16)),
79 ('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)))),
80 ('desired_version', pack.VarIntType()),
82 ('new_transaction_hashes', pack.ListType(pack.IntType(256))),
83 ('transaction_hash_refs', pack.ListType(pack.VarIntType(), 2)), # pairs of share_count, tx_count
84 ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
85 ('max_bits', bitcoin_data.FloatingIntegerType()),
86 ('bits', bitcoin_data.FloatingIntegerType()),
87 ('timestamp', pack.IntType(32)),
90 share_type = pack.ComposedType([
91 ('min_header', small_block_header_type),
92 ('share_info', share_info_type),
93 ('ref_merkle_link', pack.ComposedType([
94 ('branch', pack.ListType(pack.IntType(256))),
95 ('index', pack.IntType(0)),
97 ('last_txout_nonce', pack.IntType(32)),
98 ('hash_link', hash_link_type),
99 ('merkle_link', pack.ComposedType([
100 ('branch', pack.ListType(pack.IntType(256))),
101 ('index', pack.IntType(0)), # it will always be 0
105 ref_type = pack.ComposedType([
106 ('identifier', pack.FixedStrType(64//8)),
107 ('share_info', share_info_type),
111 gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(minout) + pack.VarStrType().pack('\x24' + pack.IntType(256).pack(0) + pack.IntType(32).pack(0))[:2]
114 def generate_transaction(cls, tracker, share_data, block_target, desired_timestamp, desired_target, ref_merkle_link, desired_other_transaction_hashes_and_fees, net, known_txs=None, last_txout_nonce=0, base_subsidy=None):
115 previous_share = tracker.items[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
117 def get_coinbase_fee(share_data, outpointsnum):
118 # calculate neccessary coinbase fee
120 # coinbase usually seems like this:
122 # 01000000 - nVersion
123 # 1a184351 - nTimestamp
126 # 0000000000000000000000000000000000000000000000000000000000000000 - Input hash
127 # ffffffff - Input index (-1)
128 # 0a02732a062f503253482f - Scriptsig
129 # ffffffff - nSequence
132 # (User outpoints, 44 bytes per each)
133 # (Donation outpoint, 76 bytes)
135 # P2Pool service outpoint (contains merkle link), 46 bytes
139 # 2417cc2063b11fd5255c7e5605780de78163ffc698ed22856bff1a5d880c3c44e400000000
141 # Giving users some time to upgrade
142 coinbase_size = 50 + (1 + len(share_data['coinbase'])) + outpointsnum * 44 + 76 + 46
144 # if coinbase size is greater than 1000 bytes, it should pay fee (0.01 per 1000 bytes)
145 if coinbase_size > 1000:
146 return int(ceil(coinbase_size / 1000.0) * minout)
150 if base_subsidy is None:
151 base_subsidy = net.PARENT.SUBSIDY_FUNC(block_target)
153 # current user payout script
154 this_script = bitcoin_data.pubkey_to_script2(share_data['pubkey'])
156 height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
157 assert height >= net.REAL_CHAIN_LENGTH or last is None
158 if height < net.TARGET_LOOKBEHIND:
159 pre_target3 = net.MAX_TARGET
161 attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True, integer=True)
162 pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
163 pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
164 pre_target3 = math.clip(pre_target2, (net.MIN_TARGET, net.MAX_TARGET))
165 max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
166 bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
168 new_transaction_hashes = []
169 new_transaction_size = 0
170 transaction_hash_refs = []
171 other_transaction_hashes = []
173 past_shares = list(tracker.get_chain(share_data['previous_share_hash'], min(height, 100)))
175 for i, share in enumerate(past_shares):
176 for j, tx_hash in enumerate(share.new_transaction_hashes):
177 if tx_hash not in tx_hash_to_this:
178 tx_hash_to_this[tx_hash] = [1+i, j] # share_count, tx_count
179 for tx_hash, fee in desired_other_transaction_hashes_and_fees:
180 if tx_hash in tx_hash_to_this:
181 this = tx_hash_to_this[tx_hash]
183 if known_txs is not None:
184 this_size = bitcoin_data.tx_type.packed_size(known_txs[tx_hash])
185 if new_transaction_size + this_size > 50000: # only allow 50 kB of new txns/share
187 new_transaction_size += this_size
188 new_transaction_hashes.append(tx_hash)
189 this = [0, len(new_transaction_hashes)-1]
190 transaction_hash_refs.extend(this)
191 other_transaction_hashes.append(tx_hash)
193 included_transactions = set(other_transaction_hashes)
195 share_data = dict(share_data, subsidy=base_subsidy)
197 raw_weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
198 min(height, net.REAL_CHAIN_LENGTH),
199 65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
202 # calculate "raw" subsidy
203 raw_subsidy = share_data['subsidy'] - 3 * minout - get_coinbase_fee(share_data, len(raw_weights) + 1)
205 # calculate "raw" amounts
206 raw_amounts = dict((script, raw_subsidy*weight//total_weight) for script, weight in raw_weights.iteritems())
208 total_remowed_weight = 0
211 # iterate list and collect all weights, which produces less than 0.01 payout
212 # it's neccessary due to NVC/PPC protocol-level limitations for coinbase outpoint size
213 for x in raw_amounts.keys():
214 if raw_amounts[x] < minout and x not in [this_script, DONATION_SCRIPT]:
215 total_remowed_weight = total_remowed_weight + raw_weights[x]
217 weights[x] = raw_weights[x]
219 total_weight = total_weight - total_remowed_weight
220 assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
223 # base subsidy value calculated as:
224 # [subsidy - (0.01 for donation + 0.01 for current user + 0.01 for p2pool outpoint) - netfee]
225 my_subsidy = share_data['subsidy'] - 3 * minout - get_coinbase_fee(share_data, len(weights) + 1)
227 # subsidy goes according to weights prior to this share
228 amounts = dict((script, my_subsidy*weight//total_weight) for script, weight in weights.iteritems())
230 # all that's left over is the donation weight and some extra satoshis due to rounding
231 amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + my_subsidy - sum(amounts.itervalues())
233 if sum(amounts.itervalues()) != my_subsidy or any(x < 0 for x in amounts.itervalues()):
236 # add 0.01 coin to donation, to satisfy the protocol
237 amounts[DONATION_SCRIPT] = amounts[DONATION_SCRIPT] + minout
239 # add 0.01 to current user output, to satisfy the protocol
240 amounts[this_script] = amounts.get(this_script, 0) + minout
244 dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
249 share_data=share_data,
250 far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
253 timestamp=math.clip(desired_timestamp, (
254 (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
255 (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
256 )) if previous_share is not None else desired_timestamp,
257 new_transaction_hashes=new_transaction_hashes,
258 transaction_hash_refs=transaction_hash_refs,
263 # coinbase timestamp must be older than share/block timestamp
264 # maybe there are more elegant solution, but this hack works quite well for now
265 timestamp=share_info['timestamp'],
267 previous_output=None,
269 script=share_data['coinbase'],
271 tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script] or script == DONATION_SCRIPT] + [dict(
272 # add 0.01 coin to service output, to satisfy the protocol
274 script='\x24' + cls.get_ref_hash(net, share_info, ref_merkle_link) + pack.IntType(32).pack(last_txout_nonce),
281 def get_share(header, last_txout_nonce=last_txout_nonce):
282 min_header = dict(header); del min_header['merkle_root']
283 share = cls(net, None, dict(
284 min_header=min_header,
285 share_info=share_info,
286 ref_merkle_link=dict(branch=[], index=0),
287 last_txout_nonce=last_txout_nonce,
288 hash_link=prefix_to_hash_link(bitcoin_data.tx_type.pack(gentx)[:-32-4-4], cls.gentx_before_refhash),
289 merkle_link=bitcoin_data.calculate_merkle_link([None] + other_transaction_hashes, 0),
291 assert share.header == header # checks merkle_root
294 return share_info, gentx, other_transaction_hashes, get_share
297 def get_ref_hash(cls, net, share_info, ref_merkle_link):
298 return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
299 identifier=net.IDENTIFIER,
300 share_info=share_info,
301 ))), ref_merkle_link))
303 __slots__ = 'net peer_addr 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(' ')
305 def __init__(self, net, peer_addr, contents):
307 self.peer_addr = peer_addr
308 self.contents = contents
310 self.min_header = contents['min_header']
311 self.share_info = contents['share_info']
312 self.hash_link = contents['hash_link']
313 self.merkle_link = contents['merkle_link']
315 if not (2 <= len(self.share_info['share_data']['coinbase']) <= 100):
316 raise ValueError('''bad coinbase size! %i bytes''' % (len(self.share_info['share_data']['coinbase']),))
318 if len(self.merkle_link['branch']) > 16:
319 raise ValueError('merkle branch too long!')
321 assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
323 self.share_data = self.share_info['share_data']
324 self.max_target = self.share_info['max_bits'].target
325 self.target = self.share_info['bits'].target
326 self.timestamp = self.share_info['timestamp']
327 self.previous_hash = self.share_data['previous_share_hash']
328 self.new_script = bitcoin_data.pubkey_to_script2(self.share_data['pubkey'])
329 self.desired_version = self.share_data['desired_version']
332 for share_count, tx_count in self.iter_transaction_hash_refs():
333 assert share_count < 110
336 assert n == set(range(len(self.share_info['new_transaction_hashes'])))
338 self.gentx_hash = check_hash_link(
340 self.get_ref_hash(net, self.share_info, contents['ref_merkle_link']) + pack.IntType(32).pack(self.contents['last_txout_nonce']) + pack.IntType(32).pack(0),
341 self.gentx_before_refhash,
343 merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, self.merkle_link)
344 self.header = dict(self.min_header, merkle_root=merkle_root)
345 self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
346 self.hash = self.header_hash = net.PARENT.BLOCKHASH_FUNC(bitcoin_data.block_header_type.pack(self.header))
348 if self.target > net.MAX_TARGET:
349 from p2pool import p2p
350 raise p2p.PeerMisbehavingError('share target invalid')
352 if self.pow_hash > self.target:
353 from p2pool import p2p
354 raise p2p.PeerMisbehavingError('share PoW invalid')
356 self.new_transaction_hashes = self.share_info['new_transaction_hashes']
359 self.time_seen = time.time()
362 return 'Share' + repr((self.net, self.peer_addr, self.contents))
365 return dict(type=self.VERSION, contents=self.share_type.pack(self.contents))
367 def iter_transaction_hash_refs(self):
368 return zip(self.share_info['transaction_hash_refs'][::2], self.share_info['transaction_hash_refs'][1::2])
370 def check(self, tracker):
371 from p2pool import p2p
372 if self.share_data['previous_share_hash'] is not None:
373 previous_share = tracker.items[self.share_data['previous_share_hash']]
374 if type(self) is type(previous_share):
376 elif type(self) is type(previous_share).SUCCESSOR:
377 if tracker.get_height(previous_share.hash) < self.net.CHAIN_LENGTH:
378 from p2pool import p2p
379 raise p2p.PeerMisbehavingError('switch without enough history')
381 # switch only valid if 85% of hashes in [self.net.CHAIN_LENGTH*9//10, self.net.CHAIN_LENGTH] for new version
382 counts = get_desired_version_counts(tracker,
383 tracker.get_nth_parent_hash(previous_share.hash, self.net.CHAIN_LENGTH*9//10), self.net.CHAIN_LENGTH//10)
384 if counts.get(self.VERSION, 0) < sum(counts.itervalues())*85//100:
385 raise p2p.PeerMisbehavingError('switch without enough hash power upgraded')
387 raise p2p.PeerMisbehavingError('''%s can't follow %s''' % (type(self).__name__, type(previous_share).__name__))
389 other_tx_hashes = [tracker.items[tracker.get_nth_parent_hash(self.hash, share_count)].share_info['new_transaction_hashes'][tx_count] for share_count, tx_count in self.iter_transaction_hash_refs()]
392 share_info, gentx, other_tx_hashes2, get_share = self.generate_transaction(
394 self.share_info['share_data'],
395 self.header['bits'].target,
396 self.share_info['timestamp'],
397 self.share_info['bits'].target,
398 self.contents['ref_merkle_link'],
399 [(h, None) for h in other_tx_hashes],
401 last_txout_nonce=self.contents['last_txout_nonce'],
405 assert other_tx_hashes2 == other_tx_hashes
407 # fixme: commented out / workaround
409 #if share_info != self.share_info:
410 # print share_info, self.share_info
411 # raise ValueError('share_info invalid')
413 if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
414 raise ValueError('''gentx doesn't match hash_link''')
416 if bitcoin_data.calculate_merkle_link([None] + other_tx_hashes, 0) != self.merkle_link:
417 raise ValueError('merkle_link and other_tx_hashes do not match')
419 return gentx # only used by as_block
421 def get_other_tx_hashes(self, tracker):
422 parents_needed = max(share_count for share_count, tx_count in self.iter_transaction_hash_refs()) if self.share_info['transaction_hash_refs'] else 0
423 parents = tracker.get_height(self.hash) - 1
424 if parents < parents_needed:
426 last_shares = list(tracker.get_chain(self.hash, parents_needed + 1))
427 return [last_shares[share_count].share_info['new_transaction_hashes'][tx_count] for share_count, tx_count in self.iter_transaction_hash_refs()]
429 def _get_other_txs(self, tracker, known_txs):
430 other_tx_hashes = self.get_other_tx_hashes(tracker)
431 if other_tx_hashes is None:
432 return None # not all parents present
434 if not all(tx_hash in known_txs for tx_hash in other_tx_hashes):
435 return None # not all txs present
437 return [known_txs[tx_hash] for tx_hash in other_tx_hashes]
439 def should_punish_reason(self, previous_block, bits, tracker, known_txs):
440 if (self.header['previous_block'], self.header['bits']) != (previous_block, bits) and self.header_hash != previous_block and self.peer_addr is not None:
441 return True, 'Block-stale detected! %x < %x' % (self.header['previous_block'], previous_block)
443 if self.pow_hash <= self.header['bits'].target:
444 return -1, 'block solution'
446 other_txs = self._get_other_txs(tracker, known_txs)
447 if other_txs is None:
448 if self.time_seen != 0: # ignore if loaded from ShareStore
449 return True, 'not all txs present'
451 all_txs_size = sum(bitcoin_data.tx_type.packed_size(tx) for tx in other_txs)
452 if all_txs_size > 1000000:
453 return True, 'txs over block size limit'
455 new_txs_size = sum(bitcoin_data.tx_type.packed_size(known_txs[tx_hash]) for tx_hash in self.share_info['new_transaction_hashes'])
456 if new_txs_size > 50000:
457 return True, 'new txs over limit'
461 def as_block(self, tracker, known_txs):
462 other_txs = self._get_other_txs(tracker, known_txs)
463 if other_txs is None:
464 return None # not all txs present
465 return dict(header=self.header, txs=[self.check(tracker)] + other_txs, signature='')
468 class WeightsSkipList(forest.TrackerSkipList):
469 # share_count, weights, total_weight
471 def get_delta(self, element):
472 from p2pool.bitcoin import data as bitcoin_data
473 share = self.tracker.items[element]
474 att = bitcoin_data.target_to_average_attempts(share.target)
475 return 1, {share.new_script: att*(65535-share.share_data['donation'])}, att*65535, att*share.share_data['donation']
477 def combine_deltas(self, (share_count1, weights1, total_weight1, total_donation_weight1), (share_count2, weights2, total_weight2, total_donation_weight2)):
478 return share_count1 + share_count2, math.add_dicts(weights1, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
480 def initial_solution(self, start, (max_shares, desired_weight)):
481 assert desired_weight % 65535 == 0, divmod(desired_weight, 65535)
484 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)):
485 if total_weight1 + total_weight2 > desired_weight and share_count2 == 1:
486 assert (desired_weight - total_weight1) % 65535 == 0
487 script, = weights2.iterkeys()
488 new_weights = {script: (desired_weight - total_weight1)//65535*weights2[script]//(total_weight2//65535)}
489 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)
490 return share_count1 + share_count2, (weights_list, weights2), total_weight1 + total_weight2, total_donation_weight1 + total_donation_weight2
492 def judge(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
493 if share_count > max_shares or total_weight > desired_weight:
495 elif share_count == max_shares or total_weight == desired_weight:
500 def finalize(self, (share_count, weights_list, total_weight, total_donation_weight), (max_shares, desired_weight)):
501 assert share_count <= max_shares and total_weight <= desired_weight
502 assert share_count == max_shares or total_weight == desired_weight
503 return math.add_dicts(*math.flatten_linked_list(weights_list)), total_weight, total_donation_weight
505 class OkayTracker(forest.Tracker):
506 def __init__(self, net):
507 forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
508 work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
509 min_work=lambda share: bitcoin_data.target_to_average_attempts(share.max_target),
512 self.verified = forest.SubsetTracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
513 work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
515 self.get_cumulative_weights = WeightsSkipList(self)
517 def attempt_verify(self, share):
518 if share.hash in self.verified.items:
520 height, last = self.get_height_and_last(share.hash)
521 if height < self.net.CHAIN_LENGTH + 1 and last is not None:
522 raise AssertionError()
526 log.err(None, 'Share check failed:')
529 self.verified.add(share)
532 def think(self, block_rel_height_func, previous_block, bits, known_txs):
536 # make 'unverified heads' set?
537 # for each overall head, attempt verification
538 # if it fails, attempt on parent, and repeat
539 # if no successful verification because of lack of parents, request parent
541 for head in set(self.heads) - set(self.verified.heads):
542 head_height, last = self.get_height_and_last(head)
544 for share in self.get_chain(head, head_height if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
545 if self.attempt_verify(share):
547 if share.hash in self.heads:
552 self.items[random.choice(list(self.reverse[last]))].peer_addr,
554 max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
555 min(x.target for x in self.get_chain(head, min(head_height, 5))),
558 assert bad not in self.verified.items
559 assert bad in self.heads
564 # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
565 for head in list(self.verified.heads):
566 head_height, last_hash = self.verified.get_height_and_last(head)
567 last_height, last_last_hash = self.get_height_and_last(last_hash)
568 # XXX review boundary conditions
569 want = max(self.net.CHAIN_LENGTH - head_height, 0)
570 can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
572 #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
573 for share in self.get_chain(last_hash, get):
574 if not self.attempt_verify(share):
576 if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
578 self.items[random.choice(list(self.verified.reverse[last_hash]))].peer_addr,
580 max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
581 min(x.target for x in self.get_chain(head, min(head_height, 5))),
585 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)
587 print len(decorated_tails), 'tails:'
588 for score, tail_hash in decorated_tails:
589 print format_hash(tail_hash), score
590 best_tail_score, best_tail = decorated_tails[-1] if decorated_tails else (None, None)
592 # decide best verified head
593 decorated_heads = sorted(((
594 self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
595 #self.items[h].peer_addr is None,
596 -self.items[h].should_punish_reason(previous_block, bits, self, known_txs)[0],
597 -self.items[h].time_seen,
598 ), h) for h in self.verified.tails.get(best_tail, []))
600 print len(decorated_heads), 'heads. Top 10:'
601 for score, head_hash in decorated_heads[-10:]:
602 print ' ', format_hash(head_hash), format_hash(self.items[head_hash].previous_hash), score
603 best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
606 best_share = self.items[best]
607 punish, punish_reason = best_share.should_punish_reason(previous_block, bits, self, known_txs)
609 print 'Punishing share for %r! Jumping from %s to %s!' % (punish_reason, format_hash(best), format_hash(best_share.previous_hash))
610 best = best_share.previous_hash
612 timestamp_cutoff = min(int(time.time()), best_share.timestamp) - 3600
613 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
615 timestamp_cutoff = int(time.time()) - 24*60*60
616 target_cutoff = 2**256-1
619 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))
620 for peer_addr, hash, ts, targ in desired:
621 print ' ', '%s:%i' % peer_addr, format_hash(hash), math.format_dt(time.time() - ts), bitcoin_data.target_to_difficulty(targ), ts >= timestamp_cutoff, targ <= target_cutoff
623 return best, [(peer_addr, hash) for peer_addr, hash, ts, targ in desired if ts >= timestamp_cutoff], decorated_heads
625 def score(self, share_hash, block_rel_height_func):
626 # returns approximate lower bound on chain's hashrate in the last self.net.CHAIN_LENGTH*15//16*self.net.SHARE_PERIOD time
628 head_height = self.verified.get_height(share_hash)
629 if head_height < self.net.CHAIN_LENGTH:
630 return head_height, None
632 end_point = self.verified.get_nth_parent_hash(share_hash, self.net.CHAIN_LENGTH*15//16)
634 block_height = max(block_rel_height_func(share.header['previous_block']) for share in
635 self.verified.get_chain(end_point, self.net.CHAIN_LENGTH//16))
637 return self.net.CHAIN_LENGTH, self.verified.get_delta(share_hash, end_point).work/((0 - block_height + 1)*self.net.PARENT.BLOCK_PERIOD)
639 def get_pool_attempts_per_second(tracker, previous_share_hash, dist, min_work=False, integer=False):
641 near = tracker.items[previous_share_hash]
642 far = tracker.items[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
643 attempts = tracker.get_delta(near.hash, far.hash).work if not min_work else tracker.get_delta(near.hash, far.hash).min_work
644 time = near.timestamp - far.timestamp
648 return attempts//time
651 def get_average_stale_prop(tracker, share_hash, lookbehind):
652 stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] is not None)
653 return stales/(lookbehind + stales)
655 def get_stale_counts(tracker, share_hash, lookbehind, rates=False):
657 for share in tracker.get_chain(share_hash, lookbehind - 1):
658 res['good'] = res.get('good', 0) + bitcoin_data.target_to_average_attempts(share.target)
659 s = share.share_data['stale_info']
661 res[s] = res.get(s, 0) + bitcoin_data.target_to_average_attempts(share.target)
663 dt = tracker.items[share_hash].timestamp - tracker.items[tracker.get_nth_parent_hash(share_hash, lookbehind - 1)].timestamp
664 res = dict((k, v/dt) for k, v in res.iteritems())
667 def get_user_stale_props(tracker, share_hash, lookbehind):
669 for share in tracker.get_chain(share_hash, lookbehind - 1):
670 stale, total = res.get(share.share_data['pubkey'], (0, 0))
672 if share.share_data['stale_info'] is not None:
675 res[share.share_data['pubkey']] = stale, total
676 return dict((pubkey, stale/total) for pubkey, (stale, total) in res.iteritems())
678 def calculate_payout(weight, total_weight, subsidy):
681 payout = (subsidy - 3*minout) * weight//total_weight
688 def get_expected_payouts(tracker, best_share_hash, block_target, subsidy, net):
690 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))
692 #res = dict((script, subsidy*weight//total_weight) for script, weight in weights.iteritems())
694 res = dict((script, calculate_payout(weight, total_weight, subsidy)) for script, weight in weights.iteritems())
695 res[DONATION_SCRIPT] = res.get(DONATION_SCRIPT, 0) + subsidy - sum(res.itervalues())
699 def get_desired_version_counts(tracker, best_share_hash, dist):
701 for share in tracker.get_chain(best_share_hash, dist):
702 res[share.desired_version] = res.get(share.desired_version, 0) + bitcoin_data.target_to_average_attempts(share.target)
705 def get_warnings(tracker, best_share, net, bitcoind_warning, bitcoind_work_value):
708 desired_version_counts = get_desired_version_counts(tracker, best_share,
709 min(net.CHAIN_LENGTH, 60*60//net.SHARE_PERIOD, tracker.get_height(best_share)))
710 majority_desired_version = max(desired_version_counts, key=lambda k: desired_version_counts[k])
711 if majority_desired_version > 14 and desired_version_counts[majority_desired_version] > sum(desired_version_counts.itervalues())/2:
712 res.append('A MAJORITY OF SHARES CONTAIN A VOTE FOR AN UNSUPPORTED SHARE IMPLEMENTATION! (v%i with %i%% support)\n'
713 'An upgrade is likely necessary. Check https://github.com/CryptoManiac/p2pool for more information.' % (
714 majority_desired_version, 100*desired_version_counts[majority_desired_version]/sum(desired_version_counts.itervalues())))
716 if bitcoind_warning is not None:
717 if 'This is a pre-release test build' not in bitcoind_warning:
718 res.append('(from bitcoind) %s' % (bitcoind_warning,))
720 if time.time() > bitcoind_work_value['last_update'] + 60:
721 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']),))
728 return '%08x' % (x % 2**32)
730 class ShareStore(object):
731 def __init__(self, prefix, net):
732 self.filename = prefix
733 self.dirname = os.path.dirname(os.path.abspath(prefix))
734 self.filename = os.path.basename(os.path.abspath(prefix))
736 self.known = None # will be filename -> set of share hashes, set of verified hashes
737 self.known_desired = None
739 def get_shares(self):
740 if self.known is not None:
741 raise AssertionError()
743 filenames, next = self.get_filenames_and_next()
744 for filename in filenames:
745 share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
746 with open(filename, 'rb') as f:
749 type_id_str, data_hex = line.strip().split(' ')
750 type_id = int(type_id_str)
756 verified_hash = int(data_hex, 16)
757 yield 'verified_hash', verified_hash
758 verified_hashes.add(verified_hash)
760 raw_share = share_type.unpack(data_hex.decode('hex'))
761 if raw_share['type'] in [0, 1, 2, 3, 4, 5, 6, 7, 8]:
763 share = load_share(raw_share, self.net, None)
765 share_hashes.add(share.hash)
767 raise NotImplementedError("share type %i" % (type_id,))
769 log.err(None, "HARMLESS error while reading saved shares, continuing where left off:")
771 self.known_desired = dict((k, (set(a), set(b))) for k, (a, b) in known.iteritems())
773 def _add_line(self, line):
774 filenames, next = self.get_filenames_and_next()
775 if filenames and os.path.getsize(filenames[-1]) < 10e6:
776 filename = filenames[-1]
780 with open(filename, 'ab') as f:
785 def add_share(self, share):
786 for filename, (share_hashes, verified_hashes) in self.known.iteritems():
787 if share.hash in share_hashes:
790 filename = self._add_line("%i %s" % (5, share_type.pack(share.as_share()).encode('hex')))
791 share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
792 share_hashes.add(share.hash)
793 share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
794 share_hashes.add(share.hash)
796 def add_verified_hash(self, share_hash):
797 for filename, (share_hashes, verified_hashes) in self.known.iteritems():
798 if share_hash in verified_hashes:
801 filename = self._add_line("%i %x" % (2, share_hash))
802 share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
803 verified_hashes.add(share_hash)
804 share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
805 verified_hashes.add(share_hash)
807 def get_filenames_and_next(self):
808 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())
809 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)))
811 def forget_share(self, share_hash):
812 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
813 if share_hash in share_hashes:
814 share_hashes.remove(share_hash)
817 def forget_verified_share(self, share_hash):
818 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
819 if share_hash in verified_hashes:
820 verified_hashes.remove(share_hash)
823 def check_remove(self):
825 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
826 #print filename, len(share_hashes) + len(verified_hashes)
827 if not share_hashes and not verified_hashes:
828 to_remove.add(filename)
829 for filename in to_remove:
830 self.known.pop(filename)
831 self.known_desired.pop(filename)
833 print "REMOVED", filename