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188 | def test_transfer_logs_and_bal_balance_changes(
pre: Alloc,
blockchain_test: BlockchainTestFiller,
fork: Fork,
) -> None:
"""
Ensure Transfer logs and BAL balance changes stay consistent within
one block.
The first transaction is a plain value transfer paying a priority
fee: both parties get BAL balance changes, the receipt carries one
Transfer log, and the coinbase tip appears in the BAL only. The
second transaction sweeps a contract balance via SELFDESTRUCT with a
zero tip: the sweep shows up both as a Transfer log and as BAL
balance changes, while the coinbase entry stays fee-only from the
first transaction.
"""
coinbase = pre.fund_eoa(amount=0)
intrinsic_gas_calculator = fork.transaction_intrinsic_cost_calculator()
intrinsic_gas = intrinsic_gas_calculator(
calldata=b"",
contract_creation=False,
access_list=[],
recipient_type=RecipientType.EMPTY_ACCOUNT,
sends_value=True,
)
top_frame_state_gas = fork.transaction_top_frame_state_gas(
sends_value=True,
recipient_type=RecipientType.EMPTY_ACCOUNT,
)
expected_gas_used = intrinsic_gas + top_frame_state_gas
tx_gas_limit = expected_gas_used + 1000 # add a small buffer
gas_price = 0xA
tx_value = 100
extra_balance = 1000
alice_initial_balance = (
(tx_gas_limit * gas_price) + tx_value + extra_balance
)
alice = pre.fund_eoa(amount=alice_initial_balance)
bob = pre.fund_eoa(amount=0)
genesis_env = Environment(base_fee_per_gas=0x7)
base_fee_per_gas = fork.base_fee_per_gas_calculator()(
parent_base_fee_per_gas=int(genesis_env.base_fee_per_gas or 0),
parent_gas_used=0,
parent_gas_limit=genesis_env.gas_limit,
)
tip_to_coinbase = (gas_price - base_fee_per_gas) * expected_gas_used
alice_final_balance = (
alice_initial_balance - tx_value - expected_gas_used * gas_price
)
tx_transfer = Transaction(
sender=alice,
to=bob,
value=tx_value,
gas_limit=tx_gas_limit,
gas_price=gas_price,
expected_receipt=TransactionReceipt(
logs=[transfer_log(alice, bob, tx_value)]
),
)
# SELFDESTRUCT sweep with a zero tip, so the coinbase BAL entry
# stays fee-only from the first transaction.
sweep_value = 500
carol = pre.fund_eoa()
dave = pre.fund_eoa(amount=0)
sweeper = pre.deploy_contract(
code=Op.SELFDESTRUCT(dave), balance=sweep_value
)
tx_sweep = Transaction(
sender=carol,
to=sweeper,
max_fee_per_gas=base_fee_per_gas,
max_priority_fee_per_gas=0,
expected_receipt=TransactionReceipt(
logs=[transfer_log(sweeper, dave, sweep_value)]
),
)
block = Block(
txs=[tx_transfer, tx_sweep],
fee_recipient=coinbase,
header_verify=Header(base_fee_per_gas=base_fee_per_gas),
expected_block_access_list=BlockAccessListExpectation(
account_expectations={
alice: BalAccountExpectation(
nonce_changes=[
BalNonceChange(block_access_index=1, post_nonce=1)
],
balance_changes=[
BalBalanceChange(
block_access_index=1,
post_balance=alice_final_balance,
)
],
),
bob: BalAccountExpectation(
balance_changes=[
BalBalanceChange(
block_access_index=1, post_balance=tx_value
)
],
),
carol: BalAccountExpectation(
nonce_changes=[
BalNonceChange(block_access_index=2, post_nonce=1)
],
),
sweeper: BalAccountExpectation(
balance_changes=[
BalBalanceChange(block_access_index=2, post_balance=0)
],
),
dave: BalAccountExpectation(
balance_changes=[
BalBalanceChange(
block_access_index=2, post_balance=sweep_value
)
],
),
# The tip is a BAL-only flow: it must never produce a
# Transfer log, and the zero-tip second transaction must
# not add a second balance change.
coinbase: BalAccountExpectation(
balance_changes=[
BalBalanceChange(
block_access_index=1,
post_balance=tip_to_coinbase,
)
],
),
}
),
)
blockchain_test(
pre=pre,
blocks=[block],
post={
bob: Account(balance=tx_value),
dave: Account(balance=sweep_value),
sweeper: Account(balance=0),
},
genesis_environment=genesis_env,
)
|