1 from __future__ import division
7 from twisted.python import log
10 from p2pool import skiplists
11 from p2pool.bitcoin import data as bitcoin_data, script
12 from p2pool.util import math, forest, pack
15 share_data_type = pack.ComposedType([
16 ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
17 ('coinbase', pack.VarStrType()),
18 ('nonce', pack.VarStrType()),
19 ('new_script', pack.VarStrType()),
20 ('subsidy', pack.IntType(64)),
21 ('donation', pack.IntType(16)),
22 ('stale_info', pack.IntType(8)), # 0 nothing, 253 orphan, 254 doa
25 share_info_type = pack.ComposedType([
26 ('share_data', share_data_type),
27 ('bits', bitcoin_data.FloatingIntegerType()),
28 ('timestamp', pack.IntType(32)),
31 share1a_type = pack.ComposedType([
32 ('header', bitcoin_data.block_header_type),
33 ('share_info', share_info_type),
34 ('merkle_branch', bitcoin_data.merkle_branch_type),
37 share1b_type = pack.ComposedType([
38 ('header', bitcoin_data.block_header_type),
39 ('share_info', share_info_type),
40 ('other_txs', pack.ListType(bitcoin_data.tx_type)),
47 share_type = pack.ComposedType([
48 ('type', pack.VarIntType()),
49 ('contents', pack.VarStrType()),
53 __slots__ = 'header share_info merkle_branch other_txs timestamp share_data previous_hash target pow_hash header_hash hash time_seen peer net new_script'.split(' ')
56 def from_share(cls, share, net):
57 if share['type'] == 0:
58 res = cls.from_share1a(share1a_type.unpack(share['contents']), net)
59 if not (res.pow_hash > res.header['bits'].target):
60 raise ValueError('invalid share type')
62 elif share['type'] == 1:
63 res = cls.from_share1b(share1b_type.unpack(share['contents']), net)
64 if not (res.pow_hash <= res.header['bits'].target):
65 raise ValueError('invalid share type')
68 raise ValueError('unknown share type: %r' % (share['type'],))
71 def from_share1a(cls, share1a, net):
72 return cls(net, **share1a)
75 def from_share1b(cls, share1b, net):
76 return cls(net, merkle_branch=bitcoin_data.calculate_merkle_branch([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in share1b['other_txs']], 0), **share1b)
78 def __init__(self, net, header, share_info, merkle_branch, other_txs=None):
81 if p2pool.DEBUG and other_txs is not None and bitcoin_data.calculate_merkle_branch([0] + [bitcoin_data.hash256(bitcoin_data.tx_type.pack(x)) for x in other_txs], 0) != merkle_branch:
82 raise ValueError('merkle_branch and other_txs do not match')
84 if len(merkle_branch) > 16:
85 raise ValueError('merkle_branch too long!')
88 self.share_info = share_info
89 self.merkle_branch = merkle_branch
91 self.share_data = self.share_info['share_data']
92 self.target = self.share_info['bits'].target
93 self.timestamp = self.share_info['timestamp']
95 if len(self.share_data['new_script']) > 100:
96 raise ValueError('new_script too long!')
97 if script.get_sigop_count(self.share_data['new_script']) > 1:
98 raise ValueError('too many sigops!')
99 self.new_script = self.share_data['new_script']
101 self.previous_hash = self.share_data['previous_share_hash']
103 if len(self.share_data['nonce']) > 100:
104 raise ValueError('nonce too long!')
106 if len(self.share_data['coinbase']) > 100:
107 raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
109 self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(header))
110 self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(header))
112 self.hash = bitcoin_data.hash256(share1a_type.pack(self.as_share1a()))
114 if self.pow_hash > self.target:
115 print 'hash %x' % self.pow_hash
116 print 'targ %x' % self.target
117 raise ValueError('not enough work!')
119 if other_txs is not None and not self.pow_hash <= self.header['bits'].target:
120 raise ValueError('other_txs provided when not a block solution')
121 if other_txs is None and self.pow_hash <= self.header['bits'].target:
122 raise ValueError('other_txs not provided when a block solution')
124 self.other_txs = other_txs
127 self.time_seen = time.time()
131 return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
133 def check(self, tracker):
134 share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.net)
135 if share_info != self.share_info:
136 raise ValueError('share difficulty invalid')
138 if bitcoin_data.check_merkle_branch(bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)), 0, self.merkle_branch) != self.header['merkle_root']:
139 raise ValueError('''gentx doesn't match header via merkle_branch''')
142 if self.pow_hash > self.header['bits'].target: # share1a
143 return dict(type=0, contents=share1a_type.pack(self.as_share1a()))
144 elif self.pow_hash <= self.header['bits'].target: # share1b
145 return dict(type=1, contents=share1b_type.pack(self.as_share1b()))
147 raise AssertionError()
149 def as_share1a(self):
150 return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
152 def as_share1b(self):
153 if self.other_txs is None:
154 raise ValueError('share does not contain all txs')
156 return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
158 def as_block(self, tracker):
159 if self.other_txs is None:
160 raise ValueError('share does not contain all txs')
162 share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.net)
163 assert share_info == self.share_info
165 return dict(header=self.header, txs=[gentx] + self.other_txs)
167 def get_pool_attempts_per_second(tracker, previous_share_hash, dist):
169 near = tracker.shares[previous_share_hash]
170 far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
171 attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
172 time = near.timestamp - far.timestamp
175 return attempts//time
177 def get_average_stale_prop(tracker, share_hash, lookbehind):
178 stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] in [253, 254])
179 return stales/(lookbehind + stales)
181 DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
183 def generate_transaction(tracker, share_data, block_target, desired_timestamp, net):
184 previous_share_hash = share_data['previous_share_hash']
185 new_script = share_data['new_script']
186 subsidy = share_data['subsidy']
187 donation = share_data['donation']
188 assert 0 <= donation <= 65535
190 if len(share_data['coinbase']) > 100:
191 raise ValueError('coinbase too long!')
193 previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
195 chain_length = getattr(net, 'REAL_CHAIN_LENGTH_FUNC', lambda _: net.REAL_CHAIN_LENGTH)(previous_share.timestamp if previous_share is not None else None)
197 height, last = tracker.get_height_and_last(previous_share_hash)
198 assert height >= chain_length or last is None
199 if height < net.TARGET_LOOKBEHIND:
200 bits = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
202 attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net.TARGET_LOOKBEHIND)
203 pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
204 pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
205 pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
206 bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
208 attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
209 max_att = net.SPREAD * attempts_to_block
211 this_att = min(bitcoin_data.target_to_average_attempts(bits.target), max_att)
212 other_weights, other_total_weight, other_donation_weight = tracker.get_cumulative_weights(previous_share_hash, min(height, chain_length), 65535*max(0, max_att - this_att))
213 assert other_total_weight == sum(other_weights.itervalues()) + other_donation_weight, (other_total_weight, sum(other_weights.itervalues()) + other_donation_weight)
214 weights, total_weight, donation_weight = math.add_dicts({new_script: this_att*(65535-donation)}, other_weights), this_att*65535 + other_total_weight, this_att*donation + other_donation_weight
215 assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
217 # 1 satoshi is always donated so that a list of p2pool generated blocks can be easily found by looking at the donation address
218 amounts = dict((script, (subsidy-1)*(199*weight)//(200*total_weight)) for (script, weight) in weights.iteritems())
219 amounts[new_script] = amounts.get(new_script, 0) + (subsidy-1)//200
220 amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + (subsidy-1)*(199*donation_weight)//(200*total_weight)
221 amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra satoshis :P
223 if sum(amounts.itervalues()) != subsidy:
225 if any(x < 0 for x in amounts.itervalues()):
228 dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
229 dests = dests[-4000:] # block length limit, unlikely to ever be hit
232 share_data=share_data,
234 timestamp=math.clip(desired_timestamp, (previous_share.timestamp - 60, previous_share.timestamp + 60)) if previous_share is not None else desired_timestamp,
237 return share_info, dict(
240 previous_output=None,
242 script=share_data['coinbase'].ljust(2, '\x00'),
244 tx_outs=[dict(value=0, script='\x20' + pack.IntType(256).pack(bitcoin_data.hash256(share_info_type.pack(share_info))))] + [dict(value=amounts[script], script=script) for script in dests if amounts[script]],
248 class OkayTracker(forest.Tracker):
249 def __init__(self, net, my_share_hashes, my_doa_share_hashes):
250 forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
251 work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
254 self.verified = forest.Tracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
255 work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
256 my_count=lambda share: 1 if share.hash in my_share_hashes else 0,
257 my_doa_count=lambda share: 1 if share.hash in my_doa_share_hashes else 0,
258 my_orphan_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 253 else 0,
259 my_dead_announce_count=lambda share: 1 if share.hash in my_share_hashes and share.share_data['stale_info'] == 254 else 0,
261 self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
263 self.get_cumulative_weights = skiplists.WeightsSkipList(self)
265 def attempt_verify(self, share):
266 if share.hash in self.verified.shares:
268 height, last = self.get_height_and_last(share.hash)
269 if height < self.net.CHAIN_LENGTH + 1 and last is not None:
270 raise AssertionError()
274 log.err(None, 'Share check failed:')
277 self.verified.add(share)
280 def think(self, block_rel_height_func, previous_block, bits):
284 # make 'unverified heads' set?
285 # for each overall head, attempt verification
286 # if it fails, attempt on parent, and repeat
287 # if no successful verification because of lack of parents, request parent
289 for head in set(self.heads) - set(self.verified.heads):
290 head_height, last = self.get_height_and_last(head)
292 for share in self.get_chain(head, head_height if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
293 if self.attempt_verify(share):
295 if share.hash in self.heads:
300 self.shares[random.choice(list(self.reverse_shares[last]))].peer,
302 max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
303 min(x.target for x in self.get_chain(head, min(head_height, 5))),
306 assert bad not in self.verified.shares
307 assert bad in self.heads
312 # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
313 for head in list(self.verified.heads):
314 head_height, last_hash = self.verified.get_height_and_last(head)
315 last_height, last_last_hash = self.get_height_and_last(last_hash)
316 # XXX review boundary conditions
317 want = max(self.net.CHAIN_LENGTH - head_height, 0)
318 can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
320 #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
321 for share in self.get_chain(last_hash, get):
322 if not self.attempt_verify(share):
324 if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
326 self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer,
328 max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
329 min(x.target for x in self.get_chain(head, min(head_height, 5))),
333 decorated_tails = sorted((self.score(max(self.verified.tails[tail_hash], key=self.verified.get_height), block_rel_height_func), tail_hash) for tail_hash in self.verified.tails) # XXX using get_height here is quite possibly incorrect and vulnerable
335 print len(decorated_tails), 'tails:'
336 for score, tail_hash in decorated_tails:
337 print format_hash(tail_hash), score
338 best_tail_score, best_tail = decorated_tails[-1] if decorated_tails else (None, None)
340 # decide best verified head
341 decorated_heads = sorted(((
342 self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
343 #self.verified.shares[h].peer is None,
344 (self.verified.shares[h].header['previous_block'], self.verified.shares[h].header['bits']) == (previous_block, bits) or self.verified.shares[h].peer is None,
345 -self.verified.shares[h].time_seen,
346 ), h) for h in self.verified.tails.get(best_tail, []))
348 print len(decorated_heads), 'heads. Top 10:'
349 for score, head_hash in decorated_heads[-10:]:
350 print ' ', format_hash(head_hash), format_hash(self.verified.shares[head_hash].previous_hash), score
351 best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
355 for i in xrange(1000):
357 for share_hash, tail in self.heads.iteritems():
358 if share_hash in [head_hash for score, head_hash in decorated_heads[-5:]]:
361 if self.shares[share_hash].time_seen > time.time() - 300:
364 if share_hash not in self.verified.shares and max(self.shares[after_tail_hash].time_seen for after_tail_hash in self.reverse_shares.get(tail)) > time.time() - 120: # XXX stupid
367 to_remove.add(share_hash)
370 for share_hash in to_remove:
371 self.remove(share_hash)
372 if share_hash in self.verified.shares:
373 self.verified.remove(share_hash)
374 #print "_________", to_remove
377 for i in xrange(1000):
379 for tail, heads in self.tails.iteritems():
380 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
382 for aftertail in self.reverse_shares.get(tail, set()):
383 if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
386 to_remove.add(aftertail)
389 # if removed from this, it must be removed from verified
391 for aftertail in to_remove:
392 if self.shares[aftertail].previous_hash not in self.tails:
393 print "erk", aftertail, self.shares[aftertail].previous_hash
395 self.remove(aftertail)
396 if aftertail in self.verified.shares:
397 self.verified.remove(aftertail)
399 #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
402 best_share = self.verified.shares[best]
403 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:
405 print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
406 best = best_share.previous_hash
408 timestamp_cutoff = min(int(time.time()), best_share.timestamp) - 3600
409 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
411 timestamp_cutoff = int(time.time()) - 24*60*60
412 target_cutoff = 2**256-1
415 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))
416 for peer, hash, ts, targ in desired:
417 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
419 return best, [(peer, hash) for peer, hash, ts, targ in desired if ts >= timestamp_cutoff and targ <= target_cutoff]
421 def score(self, share_hash, block_rel_height_func):
422 # returns approximate lower bound on chain's hashrate in the last self.net.CHAIN_LENGTH*15//16*self.net.SHARE_PERIOD time
424 head_height = self.verified.get_height(share_hash)
425 if head_height < self.net.CHAIN_LENGTH:
426 return head_height, None
428 end_point = self.verified.get_nth_parent_hash(share_hash, self.net.CHAIN_LENGTH*15//16)
430 block_height = max(block_rel_height_func(share.header['previous_block']) for share in
431 self.verified.get_chain(end_point, self.net.CHAIN_LENGTH//16))
433 return self.net.CHAIN_LENGTH, (self.verified.get_work(share_hash) - self.verified.get_work(end_point))//((0 - block_height + 1)*self.net.PARENT.BLOCK_PERIOD)
438 return '%08x' % (x % 2**32)
440 class ShareStore(object):
441 def __init__(self, prefix, net):
442 self.filename = prefix
443 self.dirname = os.path.dirname(os.path.abspath(prefix))
444 self.filename = os.path.basename(os.path.abspath(prefix))
446 self.known = None # will be filename -> set of share hashes, set of verified hashes
447 self.known_desired = None
449 def get_shares(self):
450 if self.known is not None:
451 raise AssertionError()
453 filenames, next = self.get_filenames_and_next()
454 for filename in filenames:
455 share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
456 with open(filename, 'rb') as f:
459 type_id_str, data_hex = line.strip().split(' ')
460 type_id = int(type_id_str)
466 verified_hash = int(data_hex, 16)
467 yield 'verified_hash', verified_hash
468 verified_hashes.add(verified_hash)
470 share = Share.from_share(share_type.unpack(data_hex.decode('hex')), self.net)
472 share_hashes.add(share.hash)
474 raise NotImplementedError("share type %i" % (type_id,))
476 log.err(None, "Error while reading saved shares, continuing where left off:")
478 self.known_desired = dict((k, (set(a), set(b))) for k, (a, b) in known.iteritems())
480 def _add_line(self, line):
481 filenames, next = self.get_filenames_and_next()
482 if filenames and os.path.getsize(filenames[-1]) < 10e6:
483 filename = filenames[-1]
487 with open(filename, 'ab') as f:
492 def add_share(self, share):
493 for filename, (share_hashes, verified_hashes) in self.known.iteritems():
494 if share.hash in share_hashes:
497 filename = self._add_line("%i %s" % (5, share_type.pack(share.as_share()).encode('hex')))
498 share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
499 share_hashes.add(share.hash)
500 share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
501 share_hashes.add(share.hash)
503 def add_verified_hash(self, share_hash):
504 for filename, (share_hashes, verified_hashes) in self.known.iteritems():
505 if share_hash in verified_hashes:
508 filename = self._add_line("%i %x" % (2, share_hash))
509 share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
510 verified_hashes.add(share_hash)
511 share_hashes, verified_hashes = self.known_desired.setdefault(filename, (set(), set()))
512 verified_hashes.add(share_hash)
514 def get_filenames_and_next(self):
515 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())
516 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)))
518 def forget_share(self, share_hash):
519 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
520 if share_hash in share_hashes:
521 share_hashes.remove(share_hash)
524 def forget_verified_share(self, share_hash):
525 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
526 if share_hash in verified_hashes:
527 verified_hashes.remove(share_hash)
530 def check_remove(self):
532 for filename, (share_hashes, verified_hashes) in self.known_desired.iteritems():
533 #print filename, len(share_hashes) + len(verified_hashes)
534 if not share_hashes and not verified_hashes:
535 to_remove.add(filename)
536 for filename in to_remove:
537 self.known.pop(filename)
538 self.known_desired.pop(filename)
540 print "REMOVED", filename