test_worst_blobhash()

Documentation for tests/benchmark/test_worst_compute.py::test_worst_blobhash@0f7c73a7.

Generate fixtures for these test cases for Prague with:

fill -v tests/benchmark/test_worst_compute.py::test_worst_blobhash --fork Prague

Test running a block with as many BLOBHASH instructions as possible.

Source code in tests/benchmark/test_worst_compute.py

@pytest.mark.valid_from("Cancun")
@pytest.mark.parametrize(
    "blob_index, blobs_present",
    [
        pytest.param(0, 0, id="no blobs"),
        pytest.param(0, 1, id="one blob and accessed"),
        pytest.param(1, 1, id="one blob but access non-existent index"),
        pytest.param(5, 6, id="six blobs, access latest"),
    ],
)
def test_worst_blobhash(
    fork: Fork,
    state_test: StateTestFiller,
    pre: Alloc,
    blob_index: int,
    blobs_present: bool,
):
    """Test running a block with as many BLOBHASH instructions as possible."""
    env = Environment()
    max_code_size = fork.max_code_size()
    max_stack_height = fork.max_stack_height()

    # Contract that contains a collection of BLOBHASH instructions.
    opcode_sequence = Op.BLOBHASH(blob_index) * max_stack_height
    assert len(opcode_sequence) <= max_code_size

    target_contract_address = pre.deploy_contract(code=opcode_sequence)

    # Contract that contains a loop of STATICCALLs to the target contract.
    calldata = Bytecode()
    attack_block = Op.POP(Op.STATICCALL(Op.GAS, target_contract_address, 0, 0, 0, 0))
    code = code_loop_precompile_call(calldata, attack_block, fork)
    assert len(code) <= max_code_size

    code_address = pre.deploy_contract(code=code)

    # Create blob transaction if blobs are present.
    tx_type = TransactionType.LEGACY
    blob_versioned_hashes = None
    max_fee_per_blob_gas = None
    if blobs_present > 0:
        tx_type = TransactionType.BLOB_TRANSACTION
        max_fee_per_blob_gas = fork.min_base_fee_per_blob_gas()
        blob_versioned_hashes = add_kzg_version(
            [i.to_bytes() * 32 for i in range(blobs_present)],
            BlobsSpec.BLOB_COMMITMENT_VERSION_KZG,
        )

    tx = Transaction(
        ty=tx_type,
        to=code_address,
        gas_limit=env.gas_limit,
        max_fee_per_blob_gas=max_fee_per_blob_gas,
        blob_versioned_hashes=blob_versioned_hashes,
        sender=pre.fund_eoa(),
    )

    state_test(
        env=env,
        pre=pre,
        post={},
        tx=tx,
    )

Parametrized Test Cases

The interactive table below is also available as a standalone page.

Fork All Forks Cancun Prague Osaka

Fixture Type All Fixture Types state_test blockchain_test

Test ID (Abbreviated)	blob_index	blobs_present
...fork_Cancun-state_test-no blobs	0	0
...fork_Cancun-state_test-one blob and accessed	0	1
...fork_Cancun-state_test-one blob but access non-existent index	1	1
...fork_Cancun-state_test-six blobs, access latest	5	6
...fork_Cancun-blockchain_test_from_state_test-no blobs	0	0
...fork_Cancun-blockchain_test_from_state_test-one blob and accessed	0	1
...fork_Cancun-blockchain_test_from_state_test-one blob but access non-existent index	1	1
...fork_Cancun-blockchain_test_from_state_test-six blobs, access latest	5	6
...fork_Prague-state_test-no blobs	0	0
...fork_Prague-state_test-one blob and accessed	0	1
...fork_Prague-state_test-one blob but access non-existent index	1	1
...fork_Prague-state_test-six blobs, access latest	5	6
...fork_Prague-blockchain_test_from_state_test-no blobs	0	0
...fork_Prague-blockchain_test_from_state_test-one blob and accessed	0	1
...fork_Prague-blockchain_test_from_state_test-one blob but access non-existent index	1	1
...fork_Prague-blockchain_test_from_state_test-six blobs, access latest	5	6
...fork_Osaka-state_test-no blobs	0	0
...fork_Osaka-state_test-one blob and accessed	0	1
...fork_Osaka-state_test-one blob but access non-existent index	1	1
...fork_Osaka-state_test-six blobs, access latest	5	6
...fork_Osaka-blockchain_test_from_state_test-no blobs	0	0
...fork_Osaka-blockchain_test_from_state_test-one blob and accessed	0	1
...fork_Osaka-blockchain_test_from_state_test-one blob but access non-existent index	1	1
...fork_Osaka-blockchain_test_from_state_test-six blobs, access latest	5	6