from __future__ import division
+import hashlib
+import os
import random
import time
-import os
from twisted.python import log
import p2pool
from p2pool import skiplists
-from p2pool.bitcoin import data as bitcoin_data, script
+from p2pool.bitcoin import data as bitcoin_data, script, sha256
from p2pool.util import math, forest, pack
+# hashlink
+
+hash_link_type = pack.ComposedType([
+ ('state', pack.FixedStrType(32)),
+ ('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
+ ('length', pack.VarIntType()),
+])
+
+def prefix_to_hash_link(prefix, const_ending=''):
+ assert prefix.endswith(const_ending), (prefix, const_ending)
+ x = sha256.sha256(prefix)
+ return dict(state=x.state, extra_data=x.buf[:max(0, len(x.buf)-len(const_ending))], length=x.length//8)
+
+def check_hash_link(hash_link, data, const_ending=''):
+ extra_length = hash_link['length'] % (512//8)
+ assert len(hash_link['extra_data']) == max(0, extra_length - len(const_ending))
+ extra = (hash_link['extra_data'] + const_ending)[len(hash_link['extra_data']) + len(const_ending) - extra_length:]
+ assert len(extra) == extra_length
+ return pack.IntType(256).unpack(hashlib.sha256(sha256.sha256(data, (hash_link['state'], extra, 8*hash_link['length'])).digest()).digest())
+
+# shares
+
+small_block_header_type = pack.ComposedType([
+ ('version', pack.VarIntType()), # XXX must be constrained to 32 bits
+ ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
+ ('timestamp', pack.IntType(32)),
+ ('bits', bitcoin_data.FloatingIntegerType()),
+ ('nonce', pack.IntType(32)),
+])
share_data_type = pack.ComposedType([
('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
('coinbase', pack.VarStrType()),
- ('nonce', pack.VarStrType()),
- ('new_script', pack.VarStrType()),
+ ('nonce', pack.IntType(32)),
+ ('pubkey_hash', pack.IntType(160)),
('subsidy', pack.IntType(64)),
('donation', pack.IntType(16)),
('stale_info', pack.IntType(8)), # 0 nothing, 253 orphan, 254 doa
share_info_type = pack.ComposedType([
('share_data', share_data_type),
+ ('max_bits', bitcoin_data.FloatingIntegerType()),
('bits', bitcoin_data.FloatingIntegerType()),
('timestamp', pack.IntType(32)),
])
share1a_type = pack.ComposedType([
- ('header', bitcoin_data.block_header_type),
+ ('min_header', small_block_header_type),
('share_info', share_info_type),
+ ('hash_link', hash_link_type),
('merkle_branch', bitcoin_data.merkle_branch_type),
])
share1b_type = pack.ComposedType([
- ('header', bitcoin_data.block_header_type),
+ ('min_header', small_block_header_type),
('share_info', share_info_type),
+ ('hash_link', hash_link_type),
('other_txs', pack.ListType(bitcoin_data.tx_type)),
])
+
# type:
-# 0: share1a
-# 1: share1b
+# 2: share1a
+# 3: share1b
share_type = pack.ComposedType([
('type', pack.VarIntType()),
('contents', pack.VarStrType()),
])
+
+def get_pool_attempts_per_second(tracker, previous_share_hash, dist, min_work=False):
+ assert dist >= 2
+ near = tracker.shares[previous_share_hash]
+ far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
+ attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash) if not min_work else tracker.get_delta(near.hash).min_work - tracker.get_delta(far.hash).min_work
+ time = near.timestamp - far.timestamp
+ if time <= 0:
+ time = 1
+ return attempts//time
+
+def get_average_stale_prop(tracker, share_hash, lookbehind):
+ stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] in [253, 254])
+ return stales/(lookbehind + stales)
+
+DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
+
+ref_type = pack.ComposedType([
+ ('identifier', pack.FixedStrType(64//8)),
+ ('share_info', share_info_type),
+])
+
+gentx_before_refhash = pack.VarStrType().pack(DONATION_SCRIPT) + pack.IntType(64).pack(0) + pack.VarStrType().pack('\x20' + pack.IntType(256).pack(0))[:2]
+
+def generate_transaction(tracker, share_data, block_target, desired_timestamp, desired_target, net):
+ previous_share = tracker.shares[share_data['previous_share_hash']] if share_data['previous_share_hash'] is not None else None
+
+ height, last = tracker.get_height_and_last(share_data['previous_share_hash'])
+ assert height >= net.REAL_CHAIN_LENGTH or last is None
+ if height < net.TARGET_LOOKBEHIND:
+ pre_target3 = net.MAX_TARGET
+ else:
+ attempts_per_second = get_pool_attempts_per_second(tracker, share_data['previous_share_hash'], net.TARGET_LOOKBEHIND, min_work=True)
+ pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
+ pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
+ pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
+ max_bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
+ bits = bitcoin_data.FloatingInteger.from_target_upper_bound(math.clip(desired_target, (pre_target3//10, pre_target3)))
+
+ weights, total_weight, donation_weight = tracker.get_cumulative_weights(share_data['previous_share_hash'],
+ min(height, net.REAL_CHAIN_LENGTH),
+ 65535*net.SPREAD*bitcoin_data.target_to_average_attempts(block_target),
+ )
+ assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
+
+ 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
+ this_script = bitcoin_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
+ amounts[this_script] = amounts.get(this_script, 0) + share_data['subsidy']//200 # 0.5% goes to block finder
+ 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
+
+ if sum(amounts.itervalues()) != share_data['subsidy'] or any(x < 0 for x in amounts.itervalues()):
+ raise ValueError()
+
+ dests = sorted(amounts.iterkeys(), key=lambda script: (script == DONATION_SCRIPT, amounts[script], script))[-4000:] # block length limit, unlikely to ever be hit
+
+ share_info = dict(
+ share_data=share_data,
+ max_bits=max_bits,
+ bits=bits,
+ timestamp=math.clip(desired_timestamp, (
+ (previous_share.timestamp + net.SHARE_PERIOD) - (net.SHARE_PERIOD - 1), # = previous_share.timestamp + 1
+ (previous_share.timestamp + net.SHARE_PERIOD) + (net.SHARE_PERIOD - 1),
+ )) if previous_share is not None else desired_timestamp,
+ )
+
+ return share_info, dict(
+ version=1,
+ tx_ins=[dict(
+ previous_output=None,
+ sequence=None,
+ script=share_data['coinbase'].ljust(2, '\x00'),
+ )],
+ tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]] + [dict(
+ value=0,
+ script='\x20' + pack.IntType(256).pack(bitcoin_data.hash256(ref_type.pack(dict(
+ identifier=net.IDENTIFIER,
+ share_info=share_info,
+ )))),
+ )],
+ lock_time=0,
+ )
+
+def get_expected_payouts(tracker, best_share_hash, block_target, subsidy, net):
+ 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))
+ res = dict((script, subsidy*weight//total_weight) for script, weight in weights.iteritems())
+ res[DONATION_SCRIPT] = res.get(DONATION_SCRIPT, 0) + subsidy - sum(res.itervalues())
+ return res
+
class Share(object):
- __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(' ')
+ __slots__ = 'net min_header share_info hash_link merkle_branch other_txs hash share_data max_target target timestamp previous_hash new_script gentx_hash header pow_hash header_hash time_seen peer'.split(' ')
@classmethod
- def from_share(cls, share, net):
- if share['type'] == 0:
- res = cls.from_share1a(share1a_type.unpack(share['contents']), net)
- if not (res.pow_hash > res.header['bits'].target):
- raise ValueError('invalid share type')
- return res
- elif share['type'] == 1:
- res = cls.from_share1b(share1b_type.unpack(share['contents']), net)
- if not (res.pow_hash <= res.header['bits'].target):
- raise ValueError('invalid share type')
- return res
+ def from_share(cls, share, net, peer):
+ if share['type'] == 2:
+ return cls(net, peer, other_txs=None, **share1a_type.unpack(share['contents']))
+ elif share['type'] == 3:
+ share1b = share1b_type.unpack(share['contents'])
+ return cls(net, peer, 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)
else:
raise ValueError('unknown share type: %r' % (share['type'],))
- @classmethod
- def from_share1a(cls, share1a, net):
- return cls(net, **share1a)
-
- @classmethod
- def from_share1b(cls, share1b, net):
- 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)
-
- def __init__(self, net, header, share_info, merkle_branch, other_txs=None):
- self.net = net
+ def __init__(self, net, peer, min_header, share_info, hash_link, merkle_branch, other_txs):
+ if len(share_info['share_data']['coinbase']) > 100:
+ raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
+
+ if len(merkle_branch) > 16:
+ raise ValueError('merkle_branch too long!')
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:
raise ValueError('merkle_branch and other_txs do not match')
- if len(merkle_branch) > 16:
- raise ValueError('merkle_branch too long!')
+ assert not hash_link['extra_data'], repr(hash_link['extra_data'])
- self.header = header
+ self.net = net
+ self.peer = peer
+ self.min_header = min_header
self.share_info = share_info
+ self.hash_link = hash_link
self.merkle_branch = merkle_branch
+ self.other_txs = other_txs
self.share_data = self.share_info['share_data']
+ self.max_target = self.share_info['max_bits'].target
self.target = self.share_info['bits'].target
self.timestamp = self.share_info['timestamp']
-
- if len(self.share_data['new_script']) > 100:
- raise ValueError('new_script too long!')
- if script.get_sigop_count(self.share_data['new_script']) > 1:
- raise ValueError('too many sigops!')
- self.new_script = self.share_data['new_script']
-
self.previous_hash = self.share_data['previous_share_hash']
-
- if len(self.share_data['nonce']) > 100:
- raise ValueError('nonce too long!')
-
- if len(self.share_data['coinbase']) > 100:
- raise ValueError('''coinbase too large! %i bytes''' % (len(self.share_data['coinbase']),))
-
- self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(header))
- self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(header))
-
- self.hash = bitcoin_data.hash256(share1a_type.pack(self.as_share1a()))
+ self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
+
+ self.gentx_hash = check_hash_link(
+ hash_link,
+ pack.IntType(256).pack(bitcoin_data.hash256(ref_type.pack(dict(
+ identifier=net.IDENTIFIER,
+ share_info=share_info,
+ )))) + pack.IntType(32).pack(0),
+ gentx_before_refhash,
+ )
+ merkle_root = bitcoin_data.check_merkle_branch(self.gentx_hash, 0, merkle_branch)
+ self.header = dict(min_header, merkle_root=merkle_root)
+ self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
+ self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
if self.pow_hash > self.target:
print 'hash %x' % self.pow_hash
if other_txs is None and self.pow_hash <= self.header['bits'].target:
raise ValueError('other_txs not provided when a block solution')
- self.other_txs = other_txs
+ self.hash = bitcoin_data.hash256(share_type.pack(self.as_share()))
# XXX eww
self.time_seen = time.time()
- self.peer = None
def __repr__(self):
return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
def check(self, tracker):
- share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.net)
+ share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.share_info['bits'].target, self.net)
if share_info != self.share_info:
raise ValueError('share difficulty invalid')
-
- if bitcoin_data.check_merkle_branch(bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)), 0, self.merkle_branch) != self.header['merkle_root']:
- raise ValueError('''gentx doesn't match header via merkle_branch''')
+ if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
+ raise ValueError('''gentx doesn't match hash_link''')
def as_share(self):
- if self.pow_hash > self.header['bits'].target: # share1a
- return dict(type=0, contents=share1a_type.pack(self.as_share1a()))
- elif self.pow_hash <= self.header['bits'].target: # share1b
- return dict(type=1, contents=share1b_type.pack(self.as_share1b()))
- else:
- raise AssertionError()
-
- def as_share1a(self):
- return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
-
- def as_share1b(self):
- if self.other_txs is None:
- raise ValueError('share does not contain all txs')
-
- return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
+ if not self.pow_hash <= self.header['bits'].target: # share1a
+ return dict(type=2, contents=share1a_type.pack(dict(min_header=self.min_header, share_info=self.share_info, hash_link=self.hash_link, merkle_branch=self.merkle_branch)))
+ else: # share1b
+ return dict(type=3, contents=share1b_type.pack(dict(min_header=self.min_header, share_info=self.share_info, hash_link=self.hash_link, other_txs=self.other_txs)))
def as_block(self, tracker):
if self.other_txs is None:
raise ValueError('share does not contain all txs')
- share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.net)
+ share_info, gentx = generate_transaction(tracker, self.share_info['share_data'], self.header['bits'].target, self.share_info['timestamp'], self.share_info['bits'].target, self.net)
assert share_info == self.share_info
return dict(header=self.header, txs=[gentx] + self.other_txs)
-def get_pool_attempts_per_second(tracker, previous_share_hash, dist):
- assert dist >= 2
- near = tracker.shares[previous_share_hash]
- far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
- attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
- time = near.timestamp - far.timestamp
- if time <= 0:
- time = 1
- return attempts//time
-
-def get_average_stale_prop(tracker, share_hash, lookbehind):
- stales = sum(1 for share in tracker.get_chain(share_hash, lookbehind) if share.share_data['stale_info'] in [253, 254])
- return stales/(lookbehind + stales)
-
-DONATION_SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
-
-def generate_transaction(tracker, share_data, block_target, desired_timestamp, net):
- previous_share_hash = share_data['previous_share_hash']
- new_script = share_data['new_script']
- subsidy = share_data['subsidy']
- donation = share_data['donation']
- assert 0 <= donation <= 65535
-
- if len(share_data['coinbase']) > 100:
- raise ValueError('coinbase too long!')
-
- previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
-
- chain_length = getattr(net, 'REAL_CHAIN_LENGTH_FUNC', lambda _: net.REAL_CHAIN_LENGTH)(previous_share.timestamp if previous_share is not None else None)
-
- height, last = tracker.get_height_and_last(previous_share_hash)
- assert height >= chain_length or last is None
- if height < net.TARGET_LOOKBEHIND:
- bits = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
- else:
- attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net.TARGET_LOOKBEHIND)
- pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
- pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
- pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
- bits = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
-
- attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
- max_att = net.SPREAD * attempts_to_block
-
- this_att = min(bitcoin_data.target_to_average_attempts(bits.target), max_att)
- 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))
- assert other_total_weight == sum(other_weights.itervalues()) + other_donation_weight, (other_total_weight, sum(other_weights.itervalues()) + other_donation_weight)
- 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
- assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
-
- # 1 satoshi is always donated so that a list of p2pool generated blocks can be easily found by looking at the donation address
- amounts = dict((script, (subsidy-1)*(199*weight)//(200*total_weight)) for (script, weight) in weights.iteritems())
- amounts[new_script] = amounts.get(new_script, 0) + (subsidy-1)//200
- amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + (subsidy-1)*(199*donation_weight)//(200*total_weight)
- amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra satoshis :P
-
- if sum(amounts.itervalues()) != subsidy:
- raise ValueError()
- if any(x < 0 for x in amounts.itervalues()):
- raise ValueError()
-
- dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
- dests = dests[-4000:] # block length limit, unlikely to ever be hit
-
- share_info = dict(
- share_data=share_data,
- bits=bits,
- timestamp=math.clip(desired_timestamp, (previous_share.timestamp - 60, previous_share.timestamp + 60)) if previous_share is not None else desired_timestamp,
- )
-
- return share_info, dict(
- version=1,
- tx_ins=[dict(
- previous_output=None,
- sequence=None,
- script=share_data['coinbase'].ljust(2, '\x00'),
- )],
- 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]],
- lock_time=0,
- )
-
class OkayTracker(forest.Tracker):
def __init__(self, net, my_share_hashes, my_doa_share_hashes):
forest.Tracker.__init__(self, delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
work=lambda share: bitcoin_data.target_to_average_attempts(share.target),
+ min_work=lambda share: bitcoin_data.target_to_average_attempts(share.max_target),
)))
self.net = net
self.verified = forest.Tracker(delta_type=forest.get_attributedelta_type(dict(forest.AttributeDelta.attrs,
break
if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
desired.add((
- self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer,
+ self.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer,
last_last_hash,
max(x.timestamp for x in self.get_chain(head, min(head_height, 5))),
min(x.target for x in self.get_chain(head, min(head_height, 5))),
# decide best verified head
decorated_heads = sorted(((
self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
- #self.verified.shares[h].peer is None,
- (self.verified.shares[h].header['previous_block'], self.verified.shares[h].header['bits']) == (previous_block, bits) or self.verified.shares[h].peer is None,
- -self.verified.shares[h].time_seen,
+ #self.shares[h].peer is None,
+ self.shares[h].pow_hash <= self.shares[h].header['bits'].target, # is block solution
+ (self.shares[h].header['previous_block'], self.shares[h].header['bits']) == (previous_block, bits) or self.shares[h].peer is None,
+ -self.shares[h].time_seen,
), h) for h in self.verified.tails.get(best_tail, []))
if p2pool.DEBUG:
print len(decorated_heads), 'heads. Top 10:'
for score, head_hash in decorated_heads[-10:]:
- print ' ', format_hash(head_hash), format_hash(self.verified.shares[head_hash].previous_hash), score
+ print ' ', format_hash(head_hash), format_hash(self.shares[head_hash].previous_hash), score
best_head_score, best = decorated_heads[-1] if decorated_heads else (None, None)
# eat away at heads
#print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
if best is not None:
- best_share = self.verified.shares[best]
+ best_share = self.shares[best]
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:
if p2pool.DEBUG:
print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
yield 'verified_hash', verified_hash
verified_hashes.add(verified_hash)
elif type_id == 5:
- share = Share.from_share(share_type.unpack(data_hex.decode('hex')), self.net)
+ raw_share = share_type.unpack(data_hex.decode('hex'))
+ if raw_share['type'] in [0, 1]:
+ continue
+ share = Share.from_share(raw_share, self.net, None)
yield 'share', share
share_hashes.add(share.hash)
else:
git://git.novaco.in / p2pool.git / blobdiff