AaronFiore/electrum
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optimized, cleaned up, commented

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This commit is contained in:
Tafelpoot
2014-11-05 00:37:43 +01:00
parent 7860bcfaf7
commit 5c12c2bc2f
2 changed files with 73 additions and 80 deletions
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97
lib/transaction.py
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@@ -386,15 +386,13 @@ def parse_scriptSig(d, bytes):
return
# p2sh transaction, 2 of n
match = [ opcodes.OP_0 ]
while len(match) < len(decoded):
match.append(opcodes.OP_PUSHDATA4)
match = [ opcodes.OP_0 ] + [ opcodes.OP_PUSHDATA4 ] * (len(decoded) - 1)
if not match_decoded(decoded, match):
print_error("cannot find address in input script", bytes.encode('hex'))
return
x_sig = map(lambda x:x[1].encode('hex'), decoded[1:-1])
x_sig = [x[1].encode('hex') for x in decoded[1:-1]]
d['signatures'] = parse_sig(x_sig)
d['num_sig'] = 2
@@ -410,7 +408,7 @@ def parse_scriptSig(d, bytes):
return
d['x_pubkeys'] = x_pubkeys
pubkeys = map(lambda x: parse_xpub(x)[0], x_pubkeys)
pubkeys = [parse_xpub(x)[0] for x in x_pubkeys] # xpub, addr = parse_xpub()
d['pubkeys'] = pubkeys
redeemScript = Transaction.multisig_script(pubkeys,2)
d['redeemScript'] = redeemScript
@@ -495,7 +493,9 @@ def deserialize(raw):
return d
push_script = lambda x: op_push(len(x)/2) + x
def push_script(x):
return op_push(len(x)/2) + x
class Transaction:
@@ -520,7 +520,7 @@ class Transaction:
d = deserialize(raw)
self.raw = raw
self.inputs = d['inputs']
self.outputs = map(lambda x: (x['type'], x['address'], x['value']), d['outputs'])
self.outputs = [(x['type'], x['address'], x['value']) for x in d['outputs']]
self.locktime = d['lockTime']
@classmethod
@@ -546,7 +546,7 @@ class Transaction:
if not inputs:
return
total = sum( map(lambda x:int(x.get('value')), inputs) ) - fee
total = sum(i.get('value') for i in inputs) - fee
outputs = [('address', to_address, total)]
self = klass(inputs, outputs)
self.sign({ pubkey:privkey })
@@ -567,8 +567,7 @@ class Transaction:
raise
for k in public_keys:
s += op_push(len(k)/2)
s += k
s += op_push(len(k)/2) + k
if n==2:
s += '52'
elif n==3:
@@ -612,8 +611,7 @@ class Transaction:
s = int_to_hex(1,4) # version
s += var_int( len(inputs) ) # number of inputs
for i in range(len(inputs)):
txin = inputs[i]
for i, txin in enumerate(inputs):
s += txin['prevout_hash'].decode('hex')[::-1].encode('hex') # prev hash
s += int_to_hex(txin['prevout_n'],4) # prev index
@@ -623,37 +621,31 @@ class Transaction:
address = txin['address']
x_signatures = txin['signatures']
signatures = filter(lambda x: x is not None, x_signatures)
signatures = filter(None, x_signatures)
is_complete = len(signatures) == num_sig
if for_sig in [-1, None]:
# if we have enough signatures, we use the actual pubkeys
# use extended pubkeys (with bip32 derivation)
sig_list = []
if for_sig == -1:
# we assume that signature will be 0x48 bytes long
pubkeys = txin['pubkeys']
sig_list = [ "00"* 0x48 ] * num_sig
sig_list = [ "00" * 0x48 ] * num_sig
elif is_complete:
pubkeys = txin['pubkeys']
for signature in signatures:
sig_list.append(signature + '01')
sig_list = ((sig + '01') for sig in signatures)
else:
pubkeys = txin['x_pubkeys']
for signature in x_signatures:
sig_list.append((signature + '01') if signature is not None else NO_SIGNATURE)
sig_list = ''.join( map( lambda x: push_script(x), sig_list))
sig_list = ((sig + '01') if sig else NO_SIGNATURE for sig in x_signatures)
script = ''.join(push_script(x) for x in sig_list)
if not p2sh:
script = sig_list
x_pubkey = pubkeys[0]
if x_pubkey is None:
addrtype, h160 = bc_address_to_hash_160(txin['address'])
x_pubkey = 'fd' + (chr(addrtype) + h160).encode('hex')
script += push_script(x_pubkey)
else:
script = '00' # op_0
script += sig_list
script = '00' + script # put op_0 in front of script
redeem_script = self.multisig_script(pubkeys,2)
script += push_script(redeem_script)
@@ -689,10 +681,10 @@ class Transaction:
self.raw = None
def input_value(self):
return sum([x['value'] for x in self.inputs])
return sum(x['value'] for x in self.inputs)
def output_value(self):
return sum([ x[2] for x in self.outputs])
return sum( val for tp,addr,val in self.outputs)
def get_fee(self):
return self.input_value() - self.output_value()
@@ -703,7 +695,7 @@ class Transaction:
for txin in self.inputs:
if txin.get('is_coinbase'):
continue
signatures = filter(lambda x: x is not None, txin['signatures'])
signatures = filter(None, txin['signatures'])
s += len(signatures)
r += txin['num_sig']
return s, r
@@ -716,7 +708,7 @@ class Transaction:
out = set()
for txin in self.inputs:
x_signatures = txin['signatures']
signatures = filter(lambda x: x is not None, x_signatures)
signatures = filter(None, x_signatures)
if len(signatures) == txin['num_sig']:
# input is complete
continue
@@ -730,7 +722,7 @@ class Transaction:
def sign(self, keypairs):
print_error("tx.sign(), keypairs:", keypairs)
for i, txin in enumerate(self.inputs):
signatures = filter(lambda x: x is not None, txin['signatures'])
signatures = filter(None, txin['signatures'])
num = txin['num_sig']
if len(signatures) == num:
# continue if this txin is complete
@@ -763,14 +755,14 @@ class Transaction:
self.raw = self.serialize()
def add_pubkey_addresses(self, txlist):
for i in self.inputs:
if i.get("address") == "(pubkey)":
prev_tx = txlist.get(i.get('prevout_hash'))
def add_pubkey_addresses(self, txdict):
for txin in self.inputs:
if txin.get('address') == "(pubkey)":
prev_tx = txdict.get(txin.get('prevout_hash'))
if prev_tx:
address, value = prev_tx.get_outputs()[i.get('prevout_n')]
address, value = prev_tx.get_outputs()[txin.get('prevout_n')]
print_error("found pay-to-pubkey address:", address)
i["address"] = address
txin["address"] = address
def get_outputs(self):
@@ -788,23 +780,15 @@ class Transaction:
addr = 'OP_RETURN: "' + x.encode('hex') + '"'
else:
addr = "(None)"
o.append((addr,v))
o.append((addr,v)) # consider using yield (addr, v)
return o
def get_output_addresses(self):
return map(lambda x:x[0], self.get_outputs())
return [addr for addr, val in self.get_outputs()]
def has_address(self, addr):
found = False
for txin in self.inputs:
if addr == txin.get('address'):
found = True
break
if addr in self.get_output_addresses():
found = True
return found
return (addr in self.get_output_addresses()) or (addr in (tx.get("address") for tx in self.inputs))
def get_value(self, addresses, prevout_values):
@@ -871,19 +855,22 @@ class Transaction:
def requires_fee(self, verifier):
# see https://en.bitcoin.it/wiki/Transaction_fees
threshold = 57600000
#
# size must be smaller than 1 kbyte for free tx
size = len(self.serialize(-1))/2
if size >= 10000:
return True
for o in self.get_outputs():
value = o[1]
# all outputs must be 0.01 BTC or larger for free tx
for addr, value in self.get_outputs():
if value < 1000000:
return True
sum = 0
for i in self.inputs:
age = verifier.get_confirmations(i["prevout_hash"])[0]
sum += i["value"] * age
priority = sum / size
# priority must be large enough for free tx
threshold = 57600000
weight = 0
for txin in self.inputs:
age = verifier.get_confirmations(txin["prevout_hash"])[0]
weight += txin["value"] * age
priority = weight / size
print_error(priority, threshold)
return priority < threshold