702 lines
25 KiB
Python
702 lines
25 KiB
Python
import sys
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import hashlib
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import logging
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import ecdsa
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from ecdsa.curves import SECP256k1
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from lbryschema.address import hash_160_bytes_to_address, public_key_to_address
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from lbryschema.address import address_to_hash_160
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from .constants import TYPE_SCRIPT, TYPE_PUBKEY, TYPE_UPDATE, TYPE_SUPPORT, TYPE_CLAIM
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from .constants import TYPE_ADDRESS, NO_SIGNATURE
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from .opcodes import opcodes, match_decoded, script_GetOp
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from .bcd_data_stream import BCDataStream
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from .hashing import Hash, hash_160, hash_encode
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from .lbrycrd import op_push
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from .lbrycrd import point_to_ser, MyVerifyingKey, MySigningKey
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from .lbrycrd import regenerate_key, public_key_from_private_key
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from .lbrycrd import encode_claim_id_hex, claim_id_hash
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from .util import profiler, var_int, int_to_hex, parse_sig, rev_hex
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log = logging.getLogger()
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def parse_xpub(x_pubkey):
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if x_pubkey[0:2] in ['02', '03', '04']:
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pubkey = x_pubkey
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elif x_pubkey[0:2] == 'ff':
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from lbryum.bip32 import BIP32_Account
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xpub, s = BIP32_Account.parse_xpubkey(x_pubkey)
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pubkey = BIP32_Account.derive_pubkey_from_xpub(xpub, s[0], s[1])
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elif x_pubkey[0:2] == 'fd':
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addrtype = ord(x_pubkey[2:4].decode('hex'))
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hash160 = x_pubkey[4:].decode('hex')
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pubkey = None
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address = hash_160_bytes_to_address(hash160, addrtype)
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else:
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raise BaseException("Cannnot parse pubkey")
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if pubkey:
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address = public_key_to_address(pubkey.decode('hex'))
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return pubkey, address
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def parse_scriptSig(d, bytes):
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try:
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decoded = [x for x in script_GetOp(bytes)]
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except Exception:
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# coinbase transactions raise an exception
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log.error("cannot find address in input script: {}".format(bytes.encode('hex')))
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return
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# payto_pubkey
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match = [opcodes.OP_PUSHDATA4]
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if match_decoded(decoded, match):
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sig = decoded[0][1].encode('hex')
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d['address'] = "(pubkey)"
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d['signatures'] = [sig]
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d['num_sig'] = 1
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d['x_pubkeys'] = ["(pubkey)"]
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d['pubkeys'] = ["(pubkey)"]
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return
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# non-generated TxIn transactions push a signature
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# (seventy-something bytes) and then their public key
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# (65 bytes) onto the stack:
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match = [opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4]
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if match_decoded(decoded, match):
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sig = decoded[0][1].encode('hex')
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x_pubkey = decoded[1][1].encode('hex')
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try:
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signatures = parse_sig([sig])
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pubkey, address = parse_xpub(x_pubkey)
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except:
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import traceback
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traceback.print_exc(file=sys.stdout)
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log.error("cannot find address in input script: {}".format(bytes.encode('hex')))
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return
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d['signatures'] = signatures
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d['x_pubkeys'] = [x_pubkey]
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d['num_sig'] = 1
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d['pubkeys'] = [pubkey]
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d['address'] = address
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return
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# p2sh transaction, m of n
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match = [opcodes.OP_0] + [opcodes.OP_PUSHDATA4] * (len(decoded) - 1)
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if not match_decoded(decoded, match):
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log.error("cannot find address in input script: {}".format(bytes.encode('hex')))
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return
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x_sig = [x[1].encode('hex') for x in decoded[1:-1]]
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dec2 = [x for x in script_GetOp(decoded[-1][1])]
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m = dec2[0][0] - opcodes.OP_1 + 1
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n = dec2[-2][0] - opcodes.OP_1 + 1
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op_m = opcodes.OP_1 + m - 1
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op_n = opcodes.OP_1 + n - 1
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match_multisig = [op_m] + [opcodes.OP_PUSHDATA4] * n + [op_n, opcodes.OP_CHECKMULTISIG]
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if not match_decoded(dec2, match_multisig):
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log.error("cannot find address in input script: {}".format(bytes.encode('hex')))
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return
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x_pubkeys = map(lambda x: x[1].encode('hex'), dec2[1:-2])
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pubkeys = [parse_xpub(x)[0] for x in x_pubkeys] # xpub, addr = parse_xpub()
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redeemScript = Transaction.multisig_script(pubkeys, m)
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# write result in d
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d['num_sig'] = m
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d['signatures'] = parse_sig(x_sig)
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d['x_pubkeys'] = x_pubkeys
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d['pubkeys'] = pubkeys
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d['redeemScript'] = redeemScript
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d['address'] = hash_160_bytes_to_address(hash_160(redeemScript.decode('hex')), 5)
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class NameClaim(object):
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def __init__(self, name, value):
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self.name = name
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self.value = value
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class ClaimUpdate(object):
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def __init__(self, name, claim_id, value):
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self.name = name
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self.claim_id = claim_id
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self.value = value
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class ClaimSupport(object):
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def __init__(self, name, claim_id):
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self.name = name
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self.claim_id = claim_id
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def decode_claim_script(decoded_script):
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if len(decoded_script) <= 6:
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return False
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op = 0
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claim_type = decoded_script[op][0]
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if claim_type == opcodes.OP_UPDATE_CLAIM:
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if len(decoded_script) <= 7:
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return False
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if claim_type not in [
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opcodes.OP_CLAIM_NAME,
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opcodes.OP_SUPPORT_CLAIM,
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opcodes.OP_UPDATE_CLAIM
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]:
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return False
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op += 1
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value = None
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claim_id = None
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claim = None
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if not 0 <= decoded_script[op][0] <= opcodes.OP_PUSHDATA4:
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return False
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name = decoded_script[op][1]
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op += 1
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if not 0 <= decoded_script[op][0] <= opcodes.OP_PUSHDATA4:
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return False
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if decoded_script[0][0] in [
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opcodes.OP_SUPPORT_CLAIM,
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opcodes.OP_UPDATE_CLAIM
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]:
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claim_id = decoded_script[op][1]
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if len(claim_id) != 20:
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return False
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else:
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value = decoded_script[op][1]
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op += 1
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if decoded_script[0][0] == opcodes.OP_UPDATE_CLAIM:
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value = decoded_script[op][1]
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op += 1
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if decoded_script[op][0] != opcodes.OP_2DROP:
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return False
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op += 1
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if decoded_script[op][0] != opcodes.OP_DROP and decoded_script[0][0] == opcodes.OP_CLAIM_NAME:
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return False
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elif decoded_script[op][0] != opcodes.OP_2DROP and decoded_script[0][0] == \
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opcodes.OP_UPDATE_CLAIM:
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return False
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op += 1
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if decoded_script[0][0] == opcodes.OP_CLAIM_NAME:
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if name is None or value is None:
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return False
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claim = NameClaim(name, value)
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elif decoded_script[0][0] == opcodes.OP_UPDATE_CLAIM:
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if name is None or value is None or claim_id is None:
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return False
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claim = ClaimUpdate(name, claim_id, value)
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elif decoded_script[0][0] == opcodes.OP_SUPPORT_CLAIM:
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if name is None or claim_id is None:
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return False
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claim = ClaimSupport(name, claim_id)
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return claim, decoded_script[op:]
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def get_address_from_output_script(script_bytes):
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output_type = 0
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decoded = [x for x in script_GetOp(script_bytes)]
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r = decode_claim_script(decoded)
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claim_args = None
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if r is not False:
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claim_info, decoded = r
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if isinstance(claim_info, NameClaim):
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claim_args = (claim_info.name, claim_info.value)
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output_type |= TYPE_CLAIM
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elif isinstance(claim_info, ClaimSupport):
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claim_args = (claim_info.name, claim_info.claim_id)
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output_type |= TYPE_SUPPORT
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elif isinstance(claim_info, ClaimUpdate):
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claim_args = (claim_info.name, claim_info.claim_id, claim_info.value)
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output_type |= TYPE_UPDATE
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# The Genesis Block, self-payments, and pay-by-IP-address payments look like:
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# 65 BYTES:... CHECKSIG
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match_pubkey = [opcodes.OP_PUSHDATA4, opcodes.OP_CHECKSIG]
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# Pay-by-Bitcoin-address TxOuts look like:
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# DUP HASH160 20 BYTES:... EQUALVERIFY CHECKSIG
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match_p2pkh = [opcodes.OP_DUP, opcodes.OP_HASH160, opcodes.OP_PUSHDATA4, opcodes.OP_EQUALVERIFY,
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opcodes.OP_CHECKSIG]
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# p2sh
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match_p2sh = [opcodes.OP_HASH160, opcodes.OP_PUSHDATA4, opcodes.OP_EQUAL]
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if match_decoded(decoded, match_pubkey):
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output_val = decoded[0][1].encode('hex')
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output_type |= TYPE_PUBKEY
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elif match_decoded(decoded, match_p2pkh):
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output_val = hash_160_bytes_to_address(decoded[2][1])
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output_type |= TYPE_ADDRESS
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elif match_decoded(decoded, match_p2sh):
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output_val = hash_160_bytes_to_address(decoded[1][1], 5)
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output_type |= TYPE_ADDRESS
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else:
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output_val = bytes
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output_type |= TYPE_SCRIPT
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if output_type & (TYPE_CLAIM | TYPE_SUPPORT | TYPE_UPDATE):
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output_val = (claim_args, output_val)
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return output_type, output_val
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def parse_input(vds):
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d = {}
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prevout_hash = hash_encode(vds.read_bytes(32))
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prevout_n = vds.read_uint32()
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scriptSig = vds.read_bytes(vds.read_compact_size())
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d['scriptSig'] = scriptSig.encode('hex')
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sequence = vds.read_uint32()
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if prevout_hash == '00' * 32:
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d['is_coinbase'] = True
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else:
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d['is_coinbase'] = False
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d['prevout_hash'] = prevout_hash
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d['prevout_n'] = prevout_n
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d['sequence'] = sequence
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d['pubkeys'] = []
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d['signatures'] = {}
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d['address'] = None
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if scriptSig:
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parse_scriptSig(d, scriptSig)
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return d
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def parse_output(vds, i):
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d = {}
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d['value'] = vds.read_int64()
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scriptPubKey = vds.read_bytes(vds.read_compact_size())
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d['type'], d['address'] = get_address_from_output_script(scriptPubKey)
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d['scriptPubKey'] = scriptPubKey.encode('hex')
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d['prevout_n'] = i
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return d
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def deserialize(raw):
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vds = BCDataStream()
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vds.write(raw.decode('hex'))
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d = {}
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start = vds.read_cursor
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d['version'] = vds.read_int32()
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n_vin = vds.read_compact_size()
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d['inputs'] = list(parse_input(vds) for i in xrange(n_vin))
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n_vout = vds.read_compact_size()
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d['outputs'] = list(parse_output(vds, i) for i in xrange(n_vout))
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d['lockTime'] = vds.read_uint32()
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return d
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def push_script(x):
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return op_push(len(x) / 2) + x
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class Transaction(object):
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def __str__(self):
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if self.raw is None:
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self.raw = self.serialize()
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return self.raw
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def __init__(self, raw):
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if raw is None:
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self.raw = None
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elif type(raw) in [str, unicode]:
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self.raw = raw.strip() if raw else None
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elif type(raw) is dict:
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self.raw = raw['hex']
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else:
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raise BaseException("cannot initialize transaction", raw)
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self._inputs = None
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self._outputs = None
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def update(self, raw):
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self.raw = raw
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self._inputs = None
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self.deserialize()
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def inputs(self):
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if self._inputs is None:
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self.deserialize()
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return self._inputs
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def outputs(self):
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if self._outputs is None:
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self.deserialize()
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return self._outputs
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def update_signatures(self, raw):
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"""Add new signatures to a transaction"""
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d = deserialize(raw)
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for i, txin in enumerate(self.inputs()):
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sigs1 = txin.get('signatures')
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sigs2 = d['inputs'][i].get('signatures')
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for sig in sigs2:
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if sig in sigs1:
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continue
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for_sig = Hash(self.tx_for_sig(i).decode('hex'))
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# der to string
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order = ecdsa.ecdsa.generator_secp256k1.order()
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r, s = ecdsa.util.sigdecode_der(sig.decode('hex'), order)
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sig_string = ecdsa.util.sigencode_string(r, s, order)
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pubkeys = txin.get('pubkeys')
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compressed = True
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for recid in range(4):
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public_key = MyVerifyingKey.from_signature(sig_string, recid, for_sig,
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curve=SECP256k1)
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pubkey = point_to_ser(public_key.pubkey.point, compressed).encode('hex')
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if pubkey in pubkeys:
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public_key.verify_digest(sig_string, for_sig,
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sigdecode=ecdsa.util.sigdecode_string)
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j = pubkeys.index(pubkey)
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log.error("adding sig {} {} {} {}".format(i, j, pubkey, sig))
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self._inputs[i]['signatures'][j] = sig
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self._inputs[i]['x_pubkeys'][j] = pubkey
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break
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# redo raw
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self.raw = self.serialize()
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def deserialize(self):
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if self.raw is None:
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self.raw = self.serialize()
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if self._inputs is not None:
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return
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d = deserialize(self.raw)
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self._inputs = d['inputs']
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self._outputs = [(x['type'], x['address'], x['value']) for x in d['outputs']]
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self.locktime = d['lockTime']
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return d
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@classmethod
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def from_io(cls, inputs, outputs, locktime=0):
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self = cls(None)
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self._inputs = inputs
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self._outputs = outputs
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self.locktime = locktime
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return self
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@classmethod
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def multisig_script(cls, public_keys, m):
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n = len(public_keys)
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assert n <= 15
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assert m <= n
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op_m = format(opcodes.OP_1 + m - 1, 'x')
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op_n = format(opcodes.OP_1 + n - 1, 'x')
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keylist = [op_push(len(k) / 2) + k for k in public_keys]
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return op_m + ''.join(keylist) + op_n + 'ae'
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@classmethod
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def pay_script(cls, output_type, addr):
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script = ''
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if output_type & TYPE_CLAIM:
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claim, addr = addr
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claim_name, claim_value = claim
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script += 'b5' # op_claim_name
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script += push_script(claim_name.encode('hex'))
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script += push_script(claim_value.encode('hex'))
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script += '6d75' # op_2drop, op_drop
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elif output_type & TYPE_SUPPORT:
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claim, addr = addr
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claim_name, claim_id = claim
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script += 'b6'
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script += push_script(claim_name.encode('hex'))
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script += push_script(claim_id.encode('hex'))
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script += '6d75'
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elif output_type & TYPE_UPDATE:
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claim, addr = addr
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claim_name, claim_id, claim_value = claim
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script += 'b7'
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script += push_script(claim_name.encode('hex'))
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script += push_script(claim_id.encode('hex'))
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script += push_script(claim_value.encode('hex'))
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script += '6d6d'
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if output_type & TYPE_SCRIPT:
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script += addr.encode('hex')
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elif output_type & TYPE_ADDRESS: # op_2drop, op_drop
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addrtype, hash_160 = address_to_hash_160(addr)
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if addrtype == 0:
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script += '76a9' # op_dup, op_hash_160
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script += push_script(hash_160.encode('hex'))
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script += '88ac' # op_equalverify, op_checksig
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elif addrtype == 5:
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script += 'a9' # op_hash_160
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script += push_script(hash_160.encode('hex'))
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script += '87' # op_equal
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else:
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raise Exception("Unknown address type: %s" % addrtype)
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else:
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raise Exception("Unknown output type: %s" % output_type)
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return script
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@classmethod
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def input_script(cls, txin, i, for_sig):
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# for_sig:
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# -1 : do not sign, estimate length
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# i>=0 : serialized tx for signing input i
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# None : add all known signatures
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p2sh = txin.get('redeemScript') is not None
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num_sig = txin['num_sig'] if p2sh else 1
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address = txin['address']
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x_signatures = txin['signatures']
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signatures = filter(None, x_signatures)
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is_complete = len(signatures) == num_sig
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if for_sig in [-1, None]:
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# if we have enough signatures, we use the actual pubkeys
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# use extended pubkeys (with bip32 derivation)
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if for_sig == -1:
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# we assume that signature will be 0x48 bytes long
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pubkeys = txin['pubkeys']
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sig_list = ["00" * 0x48] * num_sig
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elif is_complete:
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pubkeys = txin['pubkeys']
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sig_list = ((sig + '01') for sig in signatures)
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else:
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pubkeys = txin['x_pubkeys']
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sig_list = ((sig + '01') if sig else NO_SIGNATURE for sig in x_signatures)
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script = ''.join(push_script(x) for x in sig_list)
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if not p2sh:
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x_pubkey = pubkeys[0]
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if x_pubkey is None:
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addrtype, h160 = address_to_hash_160(txin['address'])
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x_pubkey = 'fd' + (chr(addrtype) + h160).encode('hex')
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script += push_script(x_pubkey)
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else:
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script = '00' + script # put op_0 in front of script
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redeem_script = cls.multisig_script(pubkeys, num_sig)
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script += push_script(redeem_script)
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elif for_sig == i:
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script_type = TYPE_ADDRESS
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if 'is_claim' in txin and txin['is_claim']:
|
|
script_type |= TYPE_CLAIM
|
|
address = ((txin['claim_name'], txin['claim_value']), address)
|
|
elif 'is_support' in txin and txin['is_support']:
|
|
script_type |= TYPE_SUPPORT
|
|
address = ((txin['claim_name'], txin['claim_id']), address)
|
|
elif 'is_update' in txin and txin['is_update']:
|
|
script_type |= TYPE_UPDATE
|
|
address = ((txin['claim_name'], txin['claim_id'], txin['claim_value']), address)
|
|
script = txin['redeemScript'] if p2sh else cls.pay_script(script_type, address)
|
|
else:
|
|
script = ''
|
|
|
|
return script
|
|
|
|
@classmethod
|
|
def serialize_input(cls, txin, i, for_sig):
|
|
# Prev hash and index
|
|
s = txin['prevout_hash'].decode('hex')[::-1].encode('hex')
|
|
s += int_to_hex(txin['prevout_n'], 4)
|
|
# Script length, script, sequence
|
|
script = cls.input_script(txin, i, for_sig)
|
|
s += var_int(len(script) / 2)
|
|
s += script
|
|
s += "ffffffff"
|
|
return s
|
|
|
|
def BIP_LI01_sort(self):
|
|
# See https://github.com/kristovatlas/rfc/blob/master/bips/bip-li01.mediawiki
|
|
self._inputs.sort(key=lambda i: (i['prevout_hash'], i['prevout_n']))
|
|
self._outputs.sort(key=lambda o: (o[2], self.pay_script(o[0], o[1])))
|
|
|
|
def serialize(self, for_sig=None):
|
|
inputs = self.inputs()
|
|
outputs = self.outputs()
|
|
s = int_to_hex(1, 4) # version
|
|
s += var_int(len(inputs)) # number of inputs
|
|
for i, txin in enumerate(inputs):
|
|
s += self.serialize_input(txin, i, for_sig)
|
|
s += var_int(len(outputs)) # number of outputs
|
|
for output in outputs:
|
|
output_type, addr, amount = output
|
|
s += int_to_hex(amount, 8) # amount
|
|
script = self.pay_script(output_type, addr)
|
|
s += var_int(len(script) / 2) # script length
|
|
s += script # script
|
|
s += int_to_hex(0, 4) # lock time
|
|
if for_sig is not None and for_sig != -1:
|
|
s += int_to_hex(1, 4) # hash type
|
|
return s
|
|
|
|
def tx_for_sig(self, i):
|
|
return self.serialize(for_sig=i)
|
|
|
|
def hash(self):
|
|
return Hash(self.raw.decode('hex'))[::-1].encode('hex')
|
|
|
|
def get_claim_id(self, nout):
|
|
if nout < 0:
|
|
raise IndexError
|
|
if not self._outputs[nout][0] & TYPE_CLAIM:
|
|
raise ValueError
|
|
tx_hash = rev_hex(self.hash()).decode('hex')
|
|
return encode_claim_id_hex(claim_id_hash(tx_hash, nout))
|
|
|
|
def add_inputs(self, inputs):
|
|
self._inputs.extend(inputs)
|
|
self.raw = None
|
|
|
|
def add_outputs(self, outputs):
|
|
self._outputs.extend(outputs)
|
|
self.raw = None
|
|
|
|
def input_value(self):
|
|
return sum(x['value'] for x in self.inputs())
|
|
|
|
def output_value(self):
|
|
return sum(val for tp, addr, val in self.outputs())
|
|
|
|
def get_fee(self):
|
|
return self.input_value() - self.output_value()
|
|
|
|
def is_final(self):
|
|
return not any([x.get('sequence') < 0xffffffff - 1 for x in self.inputs()])
|
|
|
|
@classmethod
|
|
def fee_for_size(cls, relay_fee, fee_per_kb, size):
|
|
'''Given a fee per kB in satoshis, and a tx size in bytes,
|
|
returns the transaction fee.'''
|
|
fee = int(fee_per_kb * size / 1000.)
|
|
if fee < relay_fee:
|
|
fee = relay_fee
|
|
return fee
|
|
|
|
@profiler
|
|
def estimated_size(self):
|
|
'''Return an estimated tx size in bytes.'''
|
|
return len(self.serialize(-1)) / 2 # ASCII hex string
|
|
|
|
@classmethod
|
|
def estimated_input_size(cls, txin):
|
|
'''Return an estimated of serialized input size in bytes.'''
|
|
return len(cls.serialize_input(txin, -1, -1)) / 2
|
|
|
|
def estimated_fee(self, relay_fee, fee_per_kb):
|
|
'''Return an estimated fee given a fee per kB in satoshis.'''
|
|
return self.fee_for_size(relay_fee, fee_per_kb, self.estimated_size())
|
|
|
|
def signature_count(self):
|
|
r = 0
|
|
s = 0
|
|
for txin in self.inputs():
|
|
if txin.get('is_coinbase'):
|
|
continue
|
|
signatures = filter(None, txin.get('signatures', []))
|
|
s += len(signatures)
|
|
r += txin.get('num_sig', -1)
|
|
return s, r
|
|
|
|
def is_complete(self):
|
|
s, r = self.signature_count()
|
|
return r == s
|
|
|
|
def inputs_without_script(self):
|
|
out = set()
|
|
for i, txin in enumerate(self.inputs()):
|
|
if txin.get('scriptSig') == '':
|
|
out.add(i)
|
|
return out
|
|
|
|
def inputs_to_sign(self):
|
|
out = set()
|
|
for txin in self.inputs():
|
|
num_sig = txin.get('num_sig')
|
|
if num_sig is None:
|
|
continue
|
|
x_signatures = txin['signatures']
|
|
signatures = filter(None, x_signatures)
|
|
if len(signatures) == num_sig:
|
|
# input is complete
|
|
continue
|
|
for k, x_pubkey in enumerate(txin['x_pubkeys']):
|
|
if x_signatures[k] is not None:
|
|
# this pubkey already signed
|
|
continue
|
|
out.add(x_pubkey)
|
|
return out
|
|
|
|
def sign(self, keypairs):
|
|
for i, txin in enumerate(self.inputs()):
|
|
num = txin['num_sig']
|
|
for x_pubkey in txin['x_pubkeys']:
|
|
signatures = filter(None, txin['signatures'])
|
|
if len(signatures) == num:
|
|
# txin is complete
|
|
break
|
|
if x_pubkey in keypairs.keys():
|
|
log.debug("adding signature for %s", x_pubkey)
|
|
# add pubkey to txin
|
|
txin = self._inputs[i]
|
|
x_pubkeys = txin['x_pubkeys']
|
|
ii = x_pubkeys.index(x_pubkey)
|
|
sec = keypairs[x_pubkey]
|
|
pubkey = public_key_from_private_key(sec)
|
|
txin['x_pubkeys'][ii] = pubkey
|
|
txin['pubkeys'][ii] = pubkey
|
|
self._inputs[i] = txin
|
|
# add signature
|
|
for_sig = Hash(self.tx_for_sig(i).decode('hex'))
|
|
pkey = regenerate_key(sec)
|
|
secexp = pkey.secret
|
|
private_key = MySigningKey.from_secret_exponent(secexp, curve=SECP256k1)
|
|
public_key = private_key.get_verifying_key()
|
|
sig = private_key.sign_digest_deterministic(for_sig, hashfunc=hashlib.sha256,
|
|
sigencode=ecdsa.util.sigencode_der)
|
|
assert public_key.verify_digest(sig, for_sig,
|
|
sigdecode=ecdsa.util.sigdecode_der)
|
|
txin['signatures'][ii] = sig.encode('hex')
|
|
self._inputs[i] = txin
|
|
log.debug("is_complete: %s", self.is_complete())
|
|
self.raw = self.serialize()
|
|
|
|
def get_outputs(self):
|
|
"""convert pubkeys to addresses"""
|
|
o = []
|
|
for type, x, v in self.outputs():
|
|
if type & (TYPE_CLAIM | TYPE_UPDATE | TYPE_SUPPORT):
|
|
x = x[1]
|
|
if type & TYPE_ADDRESS:
|
|
addr = x
|
|
elif type & TYPE_PUBKEY:
|
|
addr = public_key_to_address(x.decode('hex'))
|
|
else:
|
|
addr = 'SCRIPT ' + x.encode('hex')
|
|
o.append((addr, v)) # consider using yield (addr, v)
|
|
return o
|
|
|
|
def get_output_addresses(self):
|
|
return [addr for addr, val in self.get_outputs()]
|
|
|
|
def has_address(self, addr):
|
|
return (addr in self.get_output_addresses()) or (
|
|
addr in (tx.get("address") for tx in self.inputs()))
|
|
|
|
def as_dict(self):
|
|
if self.raw is None:
|
|
self.raw = self.serialize()
|
|
self.deserialize()
|
|
out = {
|
|
'hex': self.raw,
|
|
'complete': self.is_complete()
|
|
}
|
|
return out
|
|
|
|
def requires_fee(self, wallet):
|
|
# see https://en.bitcoin.it/wiki/Transaction_fees
|
|
#
|
|
# size must be smaller than 1 kbyte for free tx
|
|
size = len(self.serialize(-1)) / 2
|
|
if size >= 10000:
|
|
return True
|
|
# all outputs must be 0.01 BTC or larger for free tx
|
|
for addr, value in self.get_outputs():
|
|
if value < 1000000:
|
|
return True
|
|
# priority must be large enough for free tx
|
|
threshold = 57600000
|
|
weight = 0
|
|
for txin in self.inputs():
|
|
age = wallet.get_confirmations(txin["prevout_hash"])[0]
|
|
weight += txin["value"] * age
|
|
priority = weight / size
|
|
log.error("{} {}".format(priority, threshold))
|
|
|
|
return priority < threshold
|