def mk_header_chain(base_header, length):
previous_header = base_header
for _ in range(length):
next_header = BlockHeader.from_parent(
parent=previous_header,
timestamp=previous_header.timestamp + 1,
gas_limit=previous_header.gas_limit,
difficulty=previous_header.difficulty,
extra_data=keccak(random.randint(0, 1e18)),
)
yield next_header
previous_header = next_header
def make_next_header(previous_header,
signer_private_key,
coinbase=ZERO_ADDRESS,
nonce=NONCE_DROP,
difficulty=2):
next_header = sign_block_header(
BlockHeader.from_parent(
coinbase=coinbase,
nonce=nonce,
parent=previous_header,
timestamp=previous_header.timestamp + 1,
gas_limit=previous_header.gas_limit,
difficulty=difficulty,
# FIXME: I think our sign_block_header is wrong
extra_data=VANITY_LENGTH * b'0' + SIGNATURE_LENGTH * b'0',
),
signer_private_key)
return next_header
def create_fhe_header_from_parent(parent_header, **header_params):
if 'difficulty' not in header_params:
# Use setdefault to ensure the new header has the same timestamp we use to calculate its
# difficulty.
header_params.setdefault('timestamp', parent_header.timestamp + 1)
header_params['difficulty'] = compute_fhe_difficulty(
parent_header,
header_params['timestamp'],
)
if 'gas_limit' not in header_params:
header_params['gas_limit'] = compute_gas_limit(
parent_header,
gas_limit_floor=GENESIS_GAS_LIMIT,
)
header = BlockHeader.from_parent(parent=parent_header, **header_params)
return header