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 = dash_data.FloatingInteger.from_target_upper_bound(pre_target3)
bits = dash_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 = dash_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*dash_data.target_to_average_attempts(block_target),
)
assert total_weight == sum(weights.itervalues()) + donation_weight, (total_weight, sum(weights.itervalues()) + donation_weight)
worker_payout = share_data['subsidy']
payments = share_data['packed_payments']
payments_tx = []
if payments is not None:
for obj in payments:
pm_script = dash_data.address_to_script2(obj['payee'],net.PARENT)
pm_payout = obj['amount']
if pm_payout > 0:
payments_tx += [dict(value=pm_payout, script=pm_script)]
worker_payout -= pm_payout
amounts = dict((script, worker_payout*(49*weight)//(50*total_weight)) for script, weight in weights.iteritems()) # 98% goes according to weights prior to this share
this_script = dash_data.pubkey_hash_to_script2(share_data['pubkey_hash'])
amounts[this_script] = amounts.get(this_script, 0) + worker_payout//50 # 2% goes to block finder
amounts[DONATION_SCRIPT] = amounts.get(DONATION_SCRIPT, 0) + worker_payout - sum(amounts.itervalues()) # all that's left over is the donation weight and some extra satoshis due to rounding
if sum(amounts.itervalues()) != worker_payout or any(x < 0 for x in amounts.itervalues()):
raise ValueError()
worker_scripts = sorted([k for k in amounts.iterkeys() if k != DONATION_SCRIPT])
worker_tx=[dict(value=amounts[script], script=script) for script in worker_scripts if amounts[script]]
donation_tx = [dict(value=amounts[DONATION_SCRIPT], script=DONATION_SCRIPT)]
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) + dash_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=worker_tx + payments_tx + donation_tx + [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(dash_data.tx_type.pack(gentx)[:-32-8-4], cls.gentx_before_refhash),
merkle_link=dash_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
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 = dash_data.FloatingInteger.from_target_upper_bound(
pre_target3)
bits = dash_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 = dash_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 *
dash_data.target_to_average_attempts(block_target),
)
assert total_weight == sum(weights.itervalues()) + donation_weight, (
total_weight, sum(weights.itervalues()) + donation_weight)
worker_payout = share_data['subsidy']
payments = share_data['packed_payments']
payments_tx = []
if payments is not None:
for obj in payments:
pm_script = dash_data.address_to_script2(
obj['payee'], net.PARENT)
pm_payout = obj['amount']
if pm_payout > 0:
payments_tx += [dict(value=pm_payout, script=pm_script)]
worker_payout -= pm_payout
amounts = dict(
(script, worker_payout * (49 * weight) // (50 * total_weight))
for script, weight in weights.iteritems(
)) # 98% goes according to weights prior to this share
this_script = dash_data.pubkey_hash_to_script2(
share_data['pubkey_hash'])
amounts[this_script] = amounts.get(
this_script, 0) + worker_payout // 50 # 2% goes to block finder
amounts[DONATION_SCRIPT] = amounts.get(
DONATION_SCRIPT, 0
) + worker_payout - sum(
amounts.itervalues()
) # all that's left over is the donation weight and some extra satoshis due to rounding
if sum(amounts.itervalues()) != worker_payout or any(
x < 0 for x in amounts.itervalues()):
raise ValueError()
worker_scripts = sorted(
[k for k in amounts.iterkeys() if k != DONATION_SCRIPT])
worker_tx = [
dict(value=amounts[script], script=script)
for script in worker_scripts if amounts[script]
]
donation_tx = [
dict(value=amounts[DONATION_SCRIPT], script=DONATION_SCRIPT)
]
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) +
dash_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=worker_tx + payments_tx + donation_tx + [
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(
dash_data.tx_type.pack(gentx)[:-32 - 8 - 4],
cls.gentx_before_refhash),
merkle_link=dash_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