LabChain/tests/utils.py

import src.proof_of_work
src.proof_of_work.verify_proof_of_work = lambda b: True

from src.block import *
from src.blockchain import *
from src.crypto import *
from src.transaction import *

from datetime import datetime


def extend_blockchain(chain, trans:list=None, verify_res=True):
    ts = datetime.utcfromtimestamp(len(chain.blocks))
    new_block = Block.create(chain, trans, ts)
    new_block.hash = new_block.get_hash()
    new_chain = Blockchain(chain.blocks + [new_block])
    assert new_chain.verify_all() == verify_res
    return new_chain

def trans_as_input(trans, out_idx=0):
    assert len(trans.targets) > out_idx
    return TransactionInput(trans.get_hash(), out_idx)

def new_trans(old_trans, out_idx=0):
    amount = old_trans.targets[out_idx].amount
    key = Signing.generatePrivateKey()
    trans = Transaction([trans_as_input(old_trans, out_idx)],
                        [TransactionTarget(key, amount)])
    trans.sign([old_trans.targets[out_idx].recipient_pk])
    return trans