793 lines
24 KiB
Python
793 lines
24 KiB
Python
# standard imports
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import logging
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import enum
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import re
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# external imports
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import coincurve
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import sha3
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from hexathon import (
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strip_0x,
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add_0x,
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compact,
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)
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from rlp import decode as rlp_decode
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from rlp import encode as rlp_encode
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from funga.eth.transaction import EIP155Transaction
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from funga.eth.encoding import (
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public_key_to_address,
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chain_id_to_v,
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)
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from potaahto.symbols import snake_and_camel
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from chainlib.hash import keccak256_hex_to_hex
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from chainlib.status import Status
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from chainlib.jsonrpc import JSONRPCRequest
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from chainlib.tx import Tx as BaseTx
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from chainlib.eth.nonce import (
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nonce as nonce_query,
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nonce_confirmed as nonce_query_confirmed,
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)
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from chainlib.block import BlockSpec
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# local imports
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from .address import to_checksum
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from .constant import (
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MINIMUM_FEE_UNITS,
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MINIMUM_FEE_PRICE,
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ZERO_ADDRESS,
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DEFAULT_FEE_LIMIT,
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)
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from .contract import ABIContractEncoder
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from .jsonrpc import to_blockheight_param
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logg = logging.getLogger(__name__)
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class TxFormat(enum.IntEnum):
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"""Tx generator output formats
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"""
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DICT = 0x00
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RAW = 0x01
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RAW_SIGNED = 0x02
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RAW_ARGS = 0x03
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RLP = 0x10
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RLP_SIGNED = 0x11
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JSONRPC = 0x10
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field_debugs = [
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'nonce',
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'gasPrice',
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'gas',
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'to',
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'value',
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'data',
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'v',
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'r',
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's',
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]
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count = nonce_query
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count_pending = nonce_query
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count_confirmed = nonce_query_confirmed
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def pack(tx_src, chain_spec):
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"""Serialize wire format transaction from transaction representation.
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:param tx_src: Transaction source.
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:type tx_src: dict
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:param chain_spec: Chain spec to calculate EIP155 v value
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:type chain_spec: chainlib.chain.ChainSpec
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:rtype: bytes
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:returns: Serialized transaction
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"""
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if isinstance(tx_src, Tx):
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tx_src = tx_src.as_dict()
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tx_src = Tx.src_normalize(tx_src)
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tx = EIP155Transaction(tx_src, tx_src['nonce'], chain_spec.chain_id())
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signature = bytearray(65)
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cursor = 0
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for a in [
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tx_src['r'],
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tx_src['s'],
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]:
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try:
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a = strip_0x(a)
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except TypeError:
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a = strip_0x(hex(a)) # believe it or not, eth_tester returns signatures as ints not hex
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for b in bytes.fromhex(a):
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signature[cursor] = b
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cursor += 1
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#signature[cursor] = chainv_to_v(chain_spec.chain_id(), tx_src['v'])
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tx.apply_signature(chain_spec.chain_id(), signature, v=tx_src['v'])
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logg.debug('tx {}'.format(tx.serialize()))
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return tx.rlp_serialize()
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def unpack(tx_raw_bytes, chain_spec):
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"""Deserialize wire format transaction to transaction representation.
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:param tx_raw_bytes: Serialized transaction
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:type tx_raw_bytes: bytes
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:param chain_spec: Chain spec to calculate EIP155 v value
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:type chain_spec: chainlib.chain.ChainSpec
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:rtype: dict
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:returns: Transaction representation
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"""
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chain_id = chain_spec.chain_id()
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tx = __unpack_raw(tx_raw_bytes, chain_id)
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tx['nonce'] = int.from_bytes(tx['nonce'], 'big')
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tx['gasPrice'] = int.from_bytes(tx['gasPrice'], 'big')
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tx['gas'] = int.from_bytes(tx['gas'], 'big')
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tx['value'] = int.from_bytes(tx['value'], 'big')
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return tx
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def unpack_hex(tx_raw_bytes, chain_spec):
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"""Deserialize wire format transaction to transaction representation, using hex values for all numeric value fields.
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:param tx_raw_bytes: Serialized transaction
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:type tx_raw_bytes: bytes
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:param chain_spec: Chain spec to calculate EIP155 v value
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:type chain_spec: chainlib.chain.ChainSpec
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:rtype: dict
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:returns: Transaction representation
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"""
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chain_id = chain_spec.chain_id()
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tx = __unpack_raw(tx_raw_bytes, chain_id)
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tx['nonce'] = add_0x(hex(tx['nonce']))
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tx['gasPrice'] = add_0x(hex(tx['gasPrice']))
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tx['gas'] = add_0x(hex(tx['gas']))
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tx['value'] = add_0x(hex(tx['value']))
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tx['chainId'] = add_0x(hex(tx['chainId']))
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return tx
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def __unpack_raw(tx_raw_bytes, chain_id=1):
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try:
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d = rlp_decode(tx_raw_bytes)
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except Exception as e:
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raise ValueError('RLP deserialization failed: {}'.format(e))
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logg.debug('decoding using chain id {}'.format(str(chain_id)))
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j = 0
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for i in d:
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v = i.hex()
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if j != 3 and v == '':
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v = '00'
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logg.debug('decoded {}: {}'.format(field_debugs[j], v))
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j += 1
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vb = chain_id
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if chain_id != 0:
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v = int.from_bytes(d[6], 'big')
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if v > 29:
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vb = v - (chain_id * 2) - 35
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r = bytearray(32)
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r[32-len(d[7]):] = d[7]
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s = bytearray(32)
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s[32-len(d[8]):] = d[8]
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logg.debug('vb {}'.format(vb))
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sig = b''.join([r, s, bytes([vb])])
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h = sha3.keccak_256()
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h.update(rlp_encode(d))
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signed_hash = h.digest()
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d[6] = chain_id
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d[7] = b''
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d[8] = b''
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h = sha3.keccak_256()
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h.update(rlp_encode(d))
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unsigned_hash = h.digest()
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#p = so.recover_public_key_from_msg_hash(unsigned_hash)
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#a = p.to_checksum_address()
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pubk = coincurve.PublicKey.from_signature_and_message(sig, unsigned_hash, hasher=None)
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a = public_key_to_address(pubk)
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logg.debug('decoded recovery byte {}'.format(vb))
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logg.debug('decoded address {}'.format(a))
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logg.debug('decoded signed hash {}'.format(signed_hash.hex()))
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logg.debug('decoded unsigned hash {}'.format(unsigned_hash.hex()))
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to = d[3].hex() or None
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if to != None:
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to = to_checksum(to)
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data = d[5].hex()
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try:
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data = add_0x(data)
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except:
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data = '0x'
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return {
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'from': a,
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'to': to,
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'nonce': d[0],
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'gasPrice': d[1],
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'gas': d[2],
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'value': d[4],
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'data': data,
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'v': v,
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'recovery_byte': vb,
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'r': add_0x(sig[:32].hex()),
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's': add_0x(sig[32:64].hex()),
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'chainId': chain_id,
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'hash': add_0x(signed_hash.hex()),
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'hash_unsigned': add_0x(unsigned_hash.hex()),
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}
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def transaction(hsh, id_generator=None):
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"""Generate json-rpc query to retrieve transaction by hash from node.
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:param hsh: Transaction hash, in hex
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:type hsh: str
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:param id_generator: json-rpc id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: dict
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:returns: rpc query object
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"""
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j = JSONRPCRequest(id_generator=id_generator)
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o = j.template()
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o['method'] = 'eth_getTransactionByHash'
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o['params'].append(add_0x(hsh))
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return j.finalize(o)
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def transaction_by_block(hsh, idx, id_generator=None):
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"""Generate json-rpc query to retrieve transaction by block hash and index.
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:param hsh: Block hash, in hex
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:type hsh: str
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:param idx: Transaction index
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:type idx: int
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:param id_generator: json-rpc id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: dict
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:returns: rpc query object
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"""
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j = JSONRPCRequest(id_generator=id_generator)
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o = j.template()
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o['method'] = 'eth_getTransactionByBlockHashAndIndex'
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o['params'].append(add_0x(hsh))
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o['params'].append(hex(idx))
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return j.finalize(o)
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def receipt(hsh, id_generator=None):
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"""Generate json-rpc query to retrieve transaction receipt by transaction hash from node.
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:param hsh: Transaction hash, in hex
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:type hsh: str
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:param id_generator: json-rpc id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: dict
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:returns: rpc query object
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"""
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j = JSONRPCRequest(id_generator=id_generator)
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o = j.template()
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o['method'] = 'eth_getTransactionReceipt'
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o['params'].append(add_0x(hsh))
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return j.finalize(o)
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def raw(tx_raw_hex, id_generator=None):
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"""Generator json-rpc query to send raw transaction to node.
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:param hsh: Serialized transaction, in hex
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:type hsh: str
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:param id_generator: json-rpc id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: dict
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:returns: rpc query object
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"""
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j = JSONRPCRequest(id_generator=id_generator)
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o = j.template()
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o['method'] = 'eth_sendRawTransaction'
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o['params'].append(add_0x(tx_raw_hex))
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return j.finalize(o)
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class TxFactory:
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"""Base class for generating and signing transactions or contract calls.
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For transactions (state changes), a signer, gas oracle and nonce oracle needs to be supplied.
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Gas oracle and nonce oracle may in some cases be needed for contract calls, if the node insists on counting gas for read-only operations.
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:param chain_spec: Chain spec to use for signer.
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:type chain_spec: chainlib.chain.ChainSpec
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:param signer: Signer middleware.
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:type param: Object implementing interface ofchainlib.eth.connection.sign_transaction_to_wire
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:param gas_oracle: Backend to generate gas parameters
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:type gas_oracle: Object implementing chainlib.eth.gas.GasOracle interface
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:param nonce_oracle: Backend to generate gas parameters
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:type nonce_oracle: Object implementing chainlib.eth.nonce.NonceOracle interface
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"""
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fee = DEFAULT_FEE_LIMIT
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def __init__(self, chain_spec, signer=None, gas_oracle=None, nonce_oracle=None):
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self.gas_oracle = gas_oracle
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self.nonce_oracle = nonce_oracle
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self.chain_spec = chain_spec
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self.signer = signer
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def build_raw(self, tx):
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"""Sign transaction data, returning the transaction hash and serialized transaction.
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In most cases, chainlib.eth.tx.TxFactory.finalize should be used instead.
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:param tx: Transaction representation
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:type tx: dict
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:rtype: tuple
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:returns: Transaction hash (in hex), serialized transaction (in hex)
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"""
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if tx['to'] == None or tx['to'] == '':
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tx['to'] = '0x'
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txe = EIP155Transaction(tx, tx['nonce'], tx['chainId'])
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tx_raw = self.signer.sign_transaction_to_wire(txe)
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tx_raw_hex = add_0x(tx_raw.hex())
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tx_hash_hex = add_0x(keccak256_hex_to_hex(tx_raw_hex))
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return (tx_hash_hex, tx_raw_hex)
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def build(self, tx, id_generator=None):
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"""Sign transaction and wrap in raw transaction json-rpc query.
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In most cases, chainlib.eth.tx.TxFactory.finalize should be used instead.
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:param tx: Transaction representation
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type tx: dict
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:param id_generator: JSONRPC id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: tuple
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:returns: Transaction hash (in hex), raw transaction rpc query object
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"""
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(tx_hash_hex, tx_raw_hex) = self.build_raw(tx)
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o = raw(tx_raw_hex, id_generator=id_generator)
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return (tx_hash_hex, o)
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def template(self, sender, recipient, use_nonce=False):
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"""Generate a base transaction template.
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:param sender: Sender address, in hex
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:type sender: str
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:param receipient: Recipient address, in hex
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:type recipient: str
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:param use_nonce: Use and advance nonce in nonce generator.
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:type use_nonce: bool
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:rtype: dict
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:returns: Transaction representation.
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"""
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gas_price = MINIMUM_FEE_PRICE
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gas_limit = MINIMUM_FEE_UNITS
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if self.gas_oracle != None:
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(gas_price, gas_limit) = self.gas_oracle.get_gas()
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logg.debug('using gas price {} limit {}'.format(gas_price, gas_limit))
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nonce = 0
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o = {
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'from': sender,
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'to': recipient,
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'value': 0,
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'data': '0x',
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'gasPrice': gas_price,
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'gas': gas_limit,
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'chainId': self.chain_spec.chain_id(),
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}
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if self.nonce_oracle != None and use_nonce:
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nonce = self.nonce_oracle.next_nonce()
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logg.debug('using nonce {} for address {}'.format(nonce, sender))
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o['nonce'] = nonce
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return o
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def normalize(self, tx):
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"""Generate field name redundancies (camel-case, snake-case).
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:param tx: Transaction representation
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:type tx: dict
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:rtype: dict:
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:returns: Transaction representation with redudant field names
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"""
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txe = EIP155Transaction(tx, tx['nonce'], tx['chainId'])
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txes = txe.serialize()
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gas_price = strip_0x(txes['gasPrice'])
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gas = strip_0x(txes['gas'])
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return {
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'from': tx['from'],
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'to': txes['to'],
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'gasPrice': add_0x(compact(gas_price)),
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'gas': add_0x(compact(gas)),
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'data': txes['data'],
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}
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def finalize(self, tx, tx_format=TxFormat.JSONRPC, id_generator=None):
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"""Sign transaction and for specified output format.
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:param tx: Transaction representation
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:type tx: dict
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:param tx_format: Transaction output format
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:type tx_format: chainlib.eth.tx.TxFormat
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:raises NotImplementedError: Unknown tx_format value
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:rtype: varies
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:returns: Transaction output in specified format.
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"""
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if tx_format == TxFormat.JSONRPC:
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return self.build(tx, id_generator=id_generator)
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elif tx_format == TxFormat.RLP_SIGNED:
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return self.build_raw(tx)
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elif tx_format == TxFormat.RAW_ARGS:
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return strip_0x(tx['data'])
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raise NotImplementedError('tx formatting {} not implemented'.format(tx_format))
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def set_code(self, tx, data, update_fee=True):
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"""Apply input data to transaction.
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:param tx: Transaction representation
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:type tx: dict
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:param data: Input data to apply, in hex
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:type data: str
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:param update_fee: Recalculate gas limit based on added input
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:type update_fee: bool
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:rtype: dict
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:returns: Transaction representation
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"""
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tx['data'] = data
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if update_fee:
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tx['gas'] = TxFactory.fee
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if self.gas_oracle != None:
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(price, tx['gas']) = self.gas_oracle.get_gas(code=data)
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else:
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logg.debug('using hardcoded gas limit of 8000000 until we have reliable vm executor')
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return tx
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def transact_noarg(self, method, contract_address, sender_address, tx_format=TxFormat.JSONRPC):
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"""Convenience generator for contract transaction with no arguments.
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:param method: Method name
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:type method: str
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:param contract_address: Contract address to transaction against, in hex
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:type contract_address: str
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:param sender_address: Transaction sender, in hex
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:type sender_address: str
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:param tx_format: Transaction output format
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:type tx_format: chainlib.eth.tx.TxFormat
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:rtype: varies
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:returns: Transaction output in selected format
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"""
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enc = ABIContractEncoder()
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enc.method(method)
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data = enc.get()
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tx = self.template(sender_address, contract_address, use_nonce=True)
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tx = self.set_code(tx, data)
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tx = self.finalize(tx, tx_format)
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return tx
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def call_noarg(self, method, contract_address, sender_address=ZERO_ADDRESS, height=BlockSpec.LATEST, id_generator=None):
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"""Convenience generator for contract (read-only) call with no arguments.
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:param method: Method name
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:type method: str
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:param contract_address: Contract address to transaction against, in hex
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:type contract_address: str
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:param sender_address: Transaction sender, in hex
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:type sender_address: str
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:param height: Transaction height specifier
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:type height: chainlib.block.BlockSpec
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:param id_generator: json-rpc id generator
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:type id_generator: JSONRPCIdGenerator
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:rtype: varies
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:returns: Transaction output in selected format
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"""
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j = JSONRPCRequest(id_generator)
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o = j.template()
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o['method'] = 'eth_call'
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enc = ABIContractEncoder()
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enc.method(method)
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data = add_0x(enc.get())
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tx = self.template(sender_address, contract_address)
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tx = self.set_code(tx, data)
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o['params'].append(self.normalize(tx))
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height = to_blockheight_param(height)
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o['params'].append(height)
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o = j.finalize(o)
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return o
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class Tx(BaseTx):
|
||
"""Wraps transaction data, transaction receipt data and block data, enforces local standardization of fields, and provides useful output formats for viewing transaction contents.
|
||
|
||
If block is applied, the transaction data or transaction hash must exist in its transactions array.
|
||
|
||
If receipt is applied, the transaction hash in the receipt must match the hash in the transaction data.
|
||
|
||
:param src: Transaction representation
|
||
:type src: dict
|
||
:param block: Apply block object in which transaction in mined.
|
||
:type block: chainlib.block.Block
|
||
:param rcpt: Apply receipt data
|
||
:type rcpt: dict
|
||
#:todo: force tx type schema parser (whether expect hex or int etc)
|
||
#:todo: divide up constructor method
|
||
"""
|
||
|
||
def __init__(self, src, block=None, rcpt=None, strict=False):
|
||
self.__rcpt_block_hash = None
|
||
|
||
src = self.src_normalize(src)
|
||
self.index = -1
|
||
tx_hash = add_0x(src['hash'])
|
||
self.hash = strip_0x(tx_hash)
|
||
if block != None:
|
||
self.apply_block(block)
|
||
try:
|
||
self.value = int(strip_0x(src['value']), 16)
|
||
except TypeError:
|
||
self.value = int(src['value'])
|
||
try:
|
||
self.nonce = int(strip_0x(src['nonce']), 16)
|
||
except TypeError:
|
||
self.nonce = int(src['nonce'])
|
||
address_from = strip_0x(src['from'])
|
||
try:
|
||
self.gas_price = int(strip_0x(src['gasPrice']), 16)
|
||
except TypeError:
|
||
self.gas_price = int(src['gasPrice'])
|
||
try:
|
||
self.gas_limit = int(strip_0x(src['gas']), 16)
|
||
except TypeError:
|
||
self.gas_limit = int(src['gas'])
|
||
self.outputs = [to_checksum(address_from)]
|
||
self.contract = None
|
||
|
||
try:
|
||
inpt = src['input']
|
||
except KeyError:
|
||
inpt = src['data']
|
||
src['input'] = src['data']
|
||
|
||
if inpt != '0x':
|
||
inpt = strip_0x(inpt)
|
||
else:
|
||
inpt = ''
|
||
self.payload = inpt
|
||
|
||
to = src['to']
|
||
if to == None:
|
||
to = ZERO_ADDRESS
|
||
self.inputs = [to_checksum(strip_0x(to))]
|
||
|
||
self.block = block
|
||
try:
|
||
self.wire = src['raw']
|
||
except KeyError:
|
||
logg.debug('no inline raw tx src, and no raw rendering implemented, field will be "None"')
|
||
|
||
self.status = Status.PENDING
|
||
self.logs = None
|
||
|
||
self.tx_rcpt_src = None
|
||
if rcpt != None:
|
||
self.apply_receipt(rcpt, strict=strict)
|
||
|
||
self.v = src.get('v')
|
||
self.r = src.get('r')
|
||
self.s = src.get('s')
|
||
|
||
self.wire = None
|
||
|
||
self.tx_src = src
|
||
|
||
|
||
def src(self):
|
||
"""Retrieve normalized representation source used to construct transaction object.
|
||
|
||
:rtype: dict
|
||
:returns: Transaction representation
|
||
"""
|
||
return self.tx_src
|
||
|
||
|
||
@classmethod
|
||
def src_normalize(self, src):
|
||
"""Normalizes transaction representation source data.
|
||
|
||
:param src: Transaction representation
|
||
:type src: dict
|
||
:rtype: dict
|
||
:returns: Transaction representation, normalized
|
||
"""
|
||
src = snake_and_camel(src)
|
||
|
||
if isinstance(src.get('v'), str):
|
||
try:
|
||
src['v'] = int(src['v'])
|
||
except ValueError:
|
||
src['v'] = int(src['v'], 16)
|
||
return src
|
||
|
||
|
||
def as_dict(self):
|
||
return self.src()
|
||
|
||
|
||
def rcpt_src(self):
|
||
return self.tx_rcpt_src
|
||
|
||
|
||
def apply_receipt(self, rcpt, strict=False):
|
||
"""Apply receipt data to transaction object.
|
||
|
||
Effect is the same as passing a receipt at construction.
|
||
|
||
:param rcpt: Receipt data
|
||
:type rcpt: dict
|
||
"""
|
||
rcpt = self.src_normalize(rcpt)
|
||
logg.debug('rcpt {}'.format(rcpt))
|
||
self.tx_rcpt_src = rcpt
|
||
|
||
tx_hash = add_0x(rcpt['transaction_hash'])
|
||
if rcpt['transaction_hash'] != add_0x(self.hash):
|
||
raise ValueError('rcpt hash {} does not match transaction hash {}'.format(rcpt['transaction_hash'], self.hash))
|
||
|
||
block_hash = add_0x(rcpt['block_hash'])
|
||
if self.block != None:
|
||
if block_hash != add_0x(self.block.hash):
|
||
raise ValueError('rcpt block hash {} does not match transaction block hash {}'.format(rcpt['block_hash'], self.block.hash))
|
||
|
||
try:
|
||
status_number = int(rcpt['status'], 16)
|
||
except TypeError:
|
||
status_number = int(rcpt['status'])
|
||
except KeyError as e:
|
||
if strict:
|
||
raise(e)
|
||
logg.debug('setting "success" status on missing status property for {}'.format(self.hash))
|
||
status_number = 1
|
||
|
||
if rcpt['block_number'] == None:
|
||
self.status = Status.PENDING
|
||
else:
|
||
if status_number == 1:
|
||
self.status = Status.SUCCESS
|
||
elif status_number == 0:
|
||
self.status = Status.ERROR
|
||
try:
|
||
self.tx_index = int(rcpt['transaction_index'], 16)
|
||
except TypeError:
|
||
self.tx_index = int(rcpt['transaction_index'])
|
||
# TODO: replace with rpc receipt/transaction translator when available
|
||
contract_address = rcpt.get('contractAddress')
|
||
if contract_address == None:
|
||
contract_address = rcpt.get('contract_address')
|
||
if contract_address != None:
|
||
self.contract = contract_address
|
||
self.logs = rcpt['logs']
|
||
try:
|
||
self.gas_used = int(rcpt['gasUsed'], 16)
|
||
except TypeError:
|
||
self.gas_used = int(rcpt['gasUsed'])
|
||
|
||
self.__rcpt_block_hash = rcpt['block_hash']
|
||
|
||
|
||
def apply_block(self, block):
|
||
"""Apply block to transaction object.
|
||
|
||
:param block: Block object
|
||
:type block: chainlib.block.Block
|
||
"""
|
||
if self.__rcpt_block_hash != None:
|
||
if block.hash != self.__rcpt_block_hash:
|
||
raise ValueError('block hash {} does not match already applied receipt block hash {}'.format(block.hash, self.__rcpt_block_hash))
|
||
self.index = block.get_tx(self.hash)
|
||
self.block = block
|
||
|
||
|
||
def generate_wire(self, chain_spec):
|
||
"""Generate transaction wire format.
|
||
|
||
:param chain_spec: Chain spec to interpret EIP155 v value.
|
||
:type chain_spec: chainlib.chain.ChainSpec
|
||
:rtype: str
|
||
:returns: Wire format, in hex
|
||
"""
|
||
if self.wire == None:
|
||
b = pack(self.src(), chain_spec)
|
||
self.wire = add_0x(b.hex())
|
||
return self.wire
|
||
|
||
|
||
@staticmethod
|
||
def from_src(src, block=None, rcpt=None, strict=False):
|
||
"""Creates a new Tx object.
|
||
|
||
Alias of constructor.
|
||
"""
|
||
return Tx(src, block=block, rcpt=rcpt, strict=strict)
|
||
|
||
|
||
def __str__(self):
|
||
if self.block != None:
|
||
return 'tx {} status {} block {} index {}'.format(add_0x(self.hash), self.status.name, self.block.number, self.index)
|
||
else:
|
||
return 'tx {} status {}'.format(add_0x(self.hash), self.status.name)
|
||
|
||
|
||
def __repr__(self):
|
||
return self.__str__()
|
||
|
||
|
||
def to_human(self):
|
||
"""Human-readable string dump of transaction contents.
|
||
|
||
:rtype: str
|
||
:returns: Contents
|
||
"""
|
||
s = """hash {}
|
||
from {}
|
||
to {}
|
||
value {}
|
||
nonce {}
|
||
gas_price {}
|
||
gas_limit {}
|
||
input {}
|
||
""".format(
|
||
self.hash,
|
||
self.outputs[0],
|
||
self.inputs[0],
|
||
self.value,
|
||
self.nonce,
|
||
self.gas_price,
|
||
self.gas_limit,
|
||
self.payload,
|
||
)
|
||
|
||
if self.status != Status.PENDING:
|
||
s += """gas_used {}
|
||
""".format(
|
||
self.gas_used,
|
||
)
|
||
|
||
s += 'status ' + self.status.name + '\n'
|
||
|
||
if self.block != None:
|
||
s += """block_number {}
|
||
block_hash {}
|
||
tx_index {}
|
||
""".format(
|
||
self.block.number,
|
||
self.block.hash,
|
||
self.tx_index,
|
||
)
|
||
|
||
|
||
if self.contract != None:
|
||
s += """contract {}
|
||
""".format(
|
||
self.contract,
|
||
)
|
||
|
||
if self.wire != None:
|
||
s += """src {}
|
||
""".format(
|
||
self.wire,
|
||
)
|
||
|
||
return s
|