funga/crypto_dev_signer/eth/transaction.py

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# standard imports
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import logging
import binascii
# external imports
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from rlp import encode as rlp_encode
from hexathon import (
strip_0x,
add_0x,
)
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logg = logging.getLogger(__name__)
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class Transaction:
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def rlp_serialize(self):
raise NotImplementedError
def serialize(self):
raise NotImplementedError
class EIP155Transaction:
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def __init__(self, tx, nonce, chainId=1):
to = None
data = None
if tx['to'] != None:
#to = binascii.unhexlify(strip_0x(tx['to'], allow_empty=True))
to = bytes.fromhex(strip_0x(tx['to'], allow_empty=True))
if tx['data'] != None:
#data = binascii.unhexlify(strip_0x(tx['data'], allow_empty=True))
data = bytes.fromhex(strip_0x(tx['data'], allow_empty=True))
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gas_price = None
start_gas = None
value = None
try:
gas_price = int(tx['gasPrice'])
except ValueError:
gas_price = int(tx['gasPrice'], 16)
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byts = ((gas_price.bit_length()-1)/8)+1
gas_price = gas_price.to_bytes(int(byts), 'big')
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try:
start_gas = int(tx['gas'])
except ValueError:
start_gas = int(tx['gas'], 16)
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byts = ((start_gas.bit_length()-1)/8)+1
start_gas = start_gas.to_bytes(int(byts), 'big')
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try:
value = int(tx['value'])
except ValueError:
value = int(tx['value'], 16)
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byts = ((value.bit_length()-1)/8)+1
value = value.to_bytes(int(byts), 'big')
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try:
nonce = int(nonce)
except ValueError:
nonce = int(nonce, 16)
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byts = ((nonce.bit_length()-1)/8)+1
nonce = nonce.to_bytes(int(byts), 'big')
try:
chainId = int(chainId)
except ValueError:
chainId = int(chainId, 16)
byts = ((chainId.bit_length()-1)/8)+1
chainId = chainId.to_bytes(int(byts), 'big')
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self.nonce = nonce
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self.gas_price = gas_price
self.start_gas = start_gas
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self.to = to
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self.value = value
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self.data = data
self.v = chainId
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self.r = b''
self.s = b''
self.sender = strip_0x(tx['from'])
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def __canonical_order(self):
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s = [
self.nonce,
self.gas_price,
self.start_gas,
self.to,
self.value,
self.data,
self.v,
self.r,
self.s,
]
return s
def bytes_serialize(self):
s = self.__canonical_order()
b = b''
for e in s:
b += e
return b
def rlp_serialize(self):
s = self.__canonical_order()
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return rlp_encode(s)
def serialize(self):
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tx = {
'nonce': add_0x(self.nonce.hex(), allow_empty=True),
'gasPrice': add_0x(self.gas_price.hex()),
'gas': add_0x(self.start_gas.hex()),
'to': add_0x(self.to.hex()),
'value': add_0x(self.value.hex(), allow_empty=True),
'data': add_0x(self.data.hex()),
'v': add_0x(self.v.hex(), allow_empty=True),
'r': add_0x(self.r.hex(), allow_empty=True),
's': add_0x(self.s.hex(), allow_empty=True),
}
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if tx['data'] == '':
tx['data'] = '0x'
if tx['value'] == '':
tx['value'] = '0x00'
if tx['nonce'] == '':
tx['nonce'] = '0x00'
return tx