only duplicated Share class so next few changes are visible

p2pool/data.py

@@ -378,6 +378,326 @@ def as_block(self, tracker, known_txs):
             return None # not all txs present
         return dict(header=self.header, txs=[self.check(tracker)] + other_txs)
 
+class Share(object):
+    VERSION = 14
+    VOTING_VERSION = 14
+    SUCCESSOR = None
+
+    small_block_header_type = pack.ComposedType([
+        ('version', pack.VarIntType()),
+        ('previous_block', pack.PossiblyNoneType(0, pack.IntType(256))),
+        ('timestamp', pack.IntType(32)),
+        ('bits', bitcoin_data.FloatingIntegerType()),
+        ('nonce', pack.IntType(32)),
+    ])
+
+    share_info_type = pack.ComposedType([
+        ('share_data', pack.ComposedType([
+            ('previous_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
+            ('coinbase', pack.VarStrType()),
+            ('nonce', pack.IntType(32)),
+            ('pubkey_hash', pack.IntType(160)),
+            ('subsidy', pack.IntType(64)),
+            ('donation', pack.IntType(16)),
+            ('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)))),
+            ('desired_version', pack.VarIntType()),
+        ])),
+        ('new_transaction_hashes', pack.ListType(pack.IntType(256))),
+        ('transaction_hash_refs', pack.ListType(pack.VarIntType(), 2)), # pairs of share_count, tx_count
+        ('far_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
+        ('max_bits', bitcoin_data.FloatingIntegerType()),
+        ('bits', bitcoin_data.FloatingIntegerType()),
+        ('timestamp', pack.IntType(32)),
+        ('absheight', pack.IntType(32)),
+        ('abswork', pack.IntType(128)),
+    ])
+
+    share_type = pack.ComposedType([
+        ('min_header', small_block_header_type),
+        ('share_info', share_info_type),
+        ('ref_merkle_link', pack.ComposedType([
+            ('branch', pack.ListType(pack.IntType(256))),
+            ('index', pack.IntType(0)),
+        ])),
+        ('last_txout_nonce', pack.IntType(64)),
+        ('hash_link', hash_link_type),
+        ('merkle_link', pack.ComposedType([
+            ('branch', pack.ListType(pack.IntType(256))),
+            ('index', pack.IntType(0)), # it will always be 0
+        ])),
+    ])
+
+    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('\x6a\x28' + pack.IntType(256).pack(0) + pack.IntType(64).pack(0))[:3]
+
+    @classmethod
+    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):
+        previous_share = tracker.items[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, integer=True)
+            pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1 if attempts_per_second else 2**256-1
+            pre_target2 = math.clip(pre_target, (previous_share.max_target*9//10, previous_share.max_target*11//10))
+            pre_target3 = math.clip(pre_target2, (net.MIN_TARGET, 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//30, pre_target3)))
+
+        new_transaction_hashes = []
+        new_transaction_size = 0
+        transaction_hash_refs = []
+        other_transaction_hashes = []
+
+        past_shares = list(tracker.get_chain(share_data['previous_share_hash'], min(height, 100)))
+        tx_hash_to_this = {}
+        for i, share in enumerate(past_shares):
+            for j, tx_hash in enumerate(share.new_transaction_hashes):
+                if tx_hash not in tx_hash_to_this:
+                    tx_hash_to_this[tx_hash] = [1+i, j] # share_count, tx_count
+        for tx_hash, fee in desired_other_transaction_hashes_and_fees:
+            if tx_hash in tx_hash_to_this:
+                this = tx_hash_to_this[tx_hash]
+            else:
+                if known_txs is not None:
+                    this_size = bitcoin_data.tx_type.packed_size(known_txs[tx_hash])
+                    if new_transaction_size + this_size > 50000: # only allow 50 kB of new txns/share
+                        break
+                    new_transaction_size += this_size
+                new_transaction_hashes.append(tx_hash)
+                this = [0, len(new_transaction_hashes)-1]
+            transaction_hash_refs.extend(this)
+            other_transaction_hashes.append(tx_hash)
+
+        included_transactions = set(other_transaction_hashes)
+        removed_fees = [fee for tx_hash, fee in desired_other_transaction_hashes_and_fees if tx_hash not in included_transactions]
+        definite_fees = sum(0 if fee is None else fee for tx_hash, fee in desired_other_transaction_hashes_and_fees if tx_hash in included_transactions)
+        if None not in removed_fees:
+            share_data = dict(share_data, subsidy=share_data['subsidy'] - sum(removed_fees))
+        else:
+            assert base_subsidy is not None
+            share_data = dict(share_data, subsidy=base_subsidy + definite_fees)
+
+        weights, total_weight, donation_weight = tracker.get_cumulative_weights(previous_share.share_data['previous_share_hash'] if previous_share is not None else None,
+            max(0, min(height, net.REAL_CHAIN_LENGTH) - 1),
+            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,
+            far_share_hash=None if last is None and height < 99 else tracker.get_nth_parent_hash(share_data['previous_share_hash'], 99),
+            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,
+            new_transaction_hashes=new_transaction_hashes,
+            transaction_hash_refs=transaction_hash_refs,
+            absheight=((previous_share.absheight if previous_share is not None else 0) + 1) % 2**32,
+            abswork=((previous_share.abswork if previous_share is not None else 0) + bitcoin_data.target_to_average_attempts(bits.target)) % 2**128,
+        )
+
+        gentx = dict(
+            version=1,
+            tx_ins=[dict(
+                previous_output=None,
+                sequence=None,
+                script=share_data['coinbase'],
+            )],
+            tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script] or script == DONATION_SCRIPT] + [dict(
+                value=0,
+                script='\x6a\x28' + cls.get_ref_hash(net, share_info, ref_merkle_link) + pack.IntType(64).pack(last_txout_nonce),
+            )],
+            lock_time=0,
+        )
+
+        def get_share(header, last_txout_nonce=last_txout_nonce):
+            min_header = dict(header); del min_header['merkle_root']
+            share = cls(net, None, dict(
+                min_header=min_header,
+                share_info=share_info,
+                ref_merkle_link=dict(branch=[], index=0),
+                last_txout_nonce=last_txout_nonce,
+                hash_link=prefix_to_hash_link(bitcoin_data.tx_type.pack(gentx)[:-32-8-4], cls.gentx_before_refhash),
+                merkle_link=bitcoin_data.calculate_merkle_link([None] + other_transaction_hashes, 0),
+            ))
+            assert share.header == header # checks merkle_root
+            return share
+
+        return share_info, gentx, other_transaction_hashes, get_share
+
+    @classmethod
+    def get_ref_hash(cls, net, share_info, ref_merkle_link):
+        return pack.IntType(256).pack(bitcoin_data.check_merkle_link(bitcoin_data.hash256(cls.ref_type.pack(dict(
+            identifier=net.IDENTIFIER,
+            share_info=share_info,
+        ))), ref_merkle_link))
+
+    __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 absheight abswork'.split(' ')
+
+    def __init__(self, net, peer_addr, contents):
+        self.net = net
+        self.peer_addr = peer_addr
+        self.contents = contents
+
+        self.min_header = contents['min_header']
+        self.share_info = contents['share_info']
+        self.hash_link = contents['hash_link']
+        self.merkle_link = contents['merkle_link']
+
+        if not (2 <= len(self.share_info['share_data']['coinbase']) <= 100):
+            raise ValueError('''bad coinbase size! %i bytes''' % (len(self.share_info['share_data']['coinbase']),))
+
+        if len(self.merkle_link['branch']) > 16:
+            raise ValueError('merkle branch too long!')
+
+        assert not self.hash_link['extra_data'], repr(self.hash_link['extra_data'])
+
+        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']
+        self.previous_hash = self.share_data['previous_share_hash']
+        self.new_script = bitcoin_data.pubkey_hash_to_script2(self.share_data['pubkey_hash'])
+        self.desired_version = self.share_data['desired_version']
+        self.absheight = self.share_info['absheight']
+        self.abswork = self.share_info['abswork']
+
+        n = set()
+        for share_count, tx_count in self.iter_transaction_hash_refs():
+            assert share_count < 110
+            if share_count == 0:
+                n.add(tx_count)
+        assert n == set(range(len(self.share_info['new_transaction_hashes'])))
+
+        self.gentx_hash = check_hash_link(
+            self.hash_link,
+            self.get_ref_hash(net, self.share_info, contents['ref_merkle_link']) + pack.IntType(64).pack(self.contents['last_txout_nonce']) + pack.IntType(32).pack(0),
+            self.gentx_before_refhash,
+        )
+        merkle_root = bitcoin_data.check_merkle_link(self.gentx_hash, self.merkle_link)
+        self.header = dict(self.min_header, merkle_root=merkle_root)
+        self.pow_hash = net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(self.header))
+        self.hash = self.header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(self.header))
+
+        if self.target > net.MAX_TARGET:
+            from p2pool import p2p
+            raise p2p.PeerMisbehavingError('share target invalid')
+
+        if self.pow_hash > self.target:
+            from p2pool import p2p
+            raise p2p.PeerMisbehavingError('share PoW invalid')
+
+        self.new_transaction_hashes = self.share_info['new_transaction_hashes']
+
+        # XXX eww
+        self.time_seen = time.time()
+
+    def __repr__(self):
+        return 'Share' + repr((self.net, self.peer_addr, self.contents))
+
+    def as_share(self):
+        return dict(type=self.VERSION, contents=self.share_type.pack(self.contents))
+
+    def iter_transaction_hash_refs(self):
+        return zip(self.share_info['transaction_hash_refs'][::2], self.share_info['transaction_hash_refs'][1::2])
+
+    def check(self, tracker):
+        from p2pool import p2p
+        if self.share_data['previous_share_hash'] is not None:
+            previous_share = tracker.items[self.share_data['previous_share_hash']]
+            if type(self) is type(previous_share):
+                pass
+            elif type(self) is type(previous_share).SUCCESSOR:
+                if tracker.get_height(previous_share.hash) < self.net.CHAIN_LENGTH:
+                    from p2pool import p2p
+                    raise p2p.PeerMisbehavingError('switch without enough history')
+
+                # switch only valid if 60% of hashes in [self.net.CHAIN_LENGTH*9//10, self.net.CHAIN_LENGTH] for new version
+                counts = get_desired_version_counts(tracker,
+                    tracker.get_nth_parent_hash(previous_share.hash, self.net.CHAIN_LENGTH*9//10), self.net.CHAIN_LENGTH//10)
+                if counts.get(self.VERSION, 0) < sum(counts.itervalues())*60//100:
+                    raise p2p.PeerMisbehavingError('switch without enough hash power upgraded')
+            else:
+                raise p2p.PeerMisbehavingError('''%s can't follow %s''' % (type(self).__name__, type(previous_share).__name__))
+
+        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()]
+
+        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'], [(h, None) for h in other_tx_hashes], self.net, last_txout_nonce=self.contents['last_txout_nonce'])
+        assert other_tx_hashes2 == other_tx_hashes
+        if share_info != self.share_info:
+            raise ValueError('share_info invalid')
+        if bitcoin_data.hash256(bitcoin_data.tx_type.pack(gentx)) != self.gentx_hash:
+            raise ValueError('''gentx doesn't match hash_link''')
+
+        if bitcoin_data.calculate_merkle_link([None] + other_tx_hashes, 0) != self.merkle_link:
+            raise ValueError('merkle_link and other_tx_hashes do not match')
+
+        return gentx # only used by as_block
+
+    def get_other_tx_hashes(self, tracker):
+        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
+        parents = tracker.get_height(self.hash) - 1
+        if parents < parents_needed:
+            return None
+        last_shares = list(tracker.get_chain(self.hash, parents_needed + 1))
+        return [last_shares[share_count].share_info['new_transaction_hashes'][tx_count] for share_count, tx_count in self.iter_transaction_hash_refs()]
+
+    def _get_other_txs(self, tracker, known_txs):
+        other_tx_hashes = self.get_other_tx_hashes(tracker)
+        if other_tx_hashes is None:
+            return None # not all parents present
+
+        if not all(tx_hash in known_txs for tx_hash in other_tx_hashes):
+            return None # not all txs present
+
+        return [known_txs[tx_hash] for tx_hash in other_tx_hashes]
+
+    def should_punish_reason(self, previous_block, bits, tracker, known_txs):
+        if (self.header['previous_block'], self.header['bits']) != (previous_block, bits) and self.header_hash != previous_block and self.peer_addr is not None:
+            return True, 'Block-stale detected! height(%x) < height(%x) or %08x != %08x' % (self.header['previous_block'], previous_block, self.header['bits'].bits, bits.bits)
+
+        if self.pow_hash <= self.header['bits'].target:
+            return -1, 'block solution'
+
+        other_txs = self._get_other_txs(tracker, known_txs)
+        if other_txs is None:
+            pass
+        else:
+            all_txs_size = sum(bitcoin_data.tx_type.packed_size(tx) for tx in other_txs)
+            if all_txs_size > 1000000:
+                return True, 'txs over block size limit'
+
+            new_txs_size = sum(bitcoin_data.tx_type.packed_size(known_txs[tx_hash]) for tx_hash in self.share_info['new_transaction_hashes'])
+            if new_txs_size > 50000:
+                return True, 'new txs over limit'
+
+        return False, None
+
+    def as_block(self, tracker, known_txs):
+        other_txs = self._get_other_txs(tracker, known_txs)
+        if other_txs is None:
+            return None # not all txs present
+        return dict(header=self.header, txs=[self.check(tracker)] + other_txs)
+
 
 class WeightsSkipList(forest.TrackerSkipList):
     # share_count, weights, total_weight