def spend_utxo(self, utxo_id, new_owner, amount, signer):
"""Creates a spending transaction and inserts it into the chain.
Args:
utxo_id (int): Identifier of the UTXO to spend.
new_owner (EthereumAccount): Account to own the output of this spend.
amount (int): Amount to spend.
signer (EthereumAccount): Account to sign this transaction.
Returns:
int: Unique identifier of the spend.
"""
spend_tx = Transaction(*decode_utxo_id(utxo_id),
0, 0, 0,
NULL_ADDRESS,
new_owner.address, amount,
NULL_ADDRESS, 0)
spend_tx.sign1(signer.key)
blknum = self.root_chain.currentChildBlock()
block = Block(transaction_set=[spend_tx], number=blknum)
block.sign(self.operator.key)
self.root_chain.submitBlock(block.root)
self.child_chain.add_block(block)
return encode_utxo_id(blknum, 0, 0)
def submit_block(self, transactions, signer=None, force_invalid=False):
signer = signer or self.operator
blknum = self.root_chain.nextChildBlock()
block = Block(transactions, number=blknum)
block.sign(signer.key)
self.root_chain.submitBlock(block.root, sender=signer.key)
if force_invalid:
self.child_chain.blocks[self.child_chain.next_child_block] = block
self.child_chain.next_deposit_block = self.child_chain.next_child_block + 1
self.child_chain.next_child_block += self.child_chain.child_block_interval
else:
assert self.child_chain.add_block(block)
return blknum