def validate_block(self, block: BlockAPI) -> None:
if not isinstance(block, self.get_block_class()):
raise ValidationError(
f"This vm ({self!r}) is not equipped to validate a block of type {block!r}"
)
if block.is_genesis:
validate_length_lte(block.header.extra_data,
self.extra_data_max_bytes,
title="BlockHeader.extra_data")
else:
parent_header = get_parent_header(block.header, self.chaindb)
self.validate_header(block.header, parent_header)
tx_root_hash, _ = make_trie_root_and_nodes(block.transactions)
if tx_root_hash != block.header.transaction_root:
raise ValidationError(
f"Block's transaction_root ({block.header.transaction_root}) "
f"does not match expected value: {tx_root_hash}")
if len(block.uncles) > MAX_UNCLES:
raise ValidationError(
f"Blocks may have a maximum of {MAX_UNCLES} uncles. "
f"Found {len(block.uncles)}.")
if not self.chaindb.exists(block.header.state_root):
raise ValidationError("`state_root` was not found in the db.\n"
f"- state_root: {block.header.state_root}")
local_uncle_hash = keccak(rlp.encode(block.uncles))
if local_uncle_hash != block.header.uncles_hash:
raise ValidationError(
"`uncles_hash` and block `uncles` do not match.\n"
f" - num_uncles : {len(block.uncles)}\n"
f" - block uncle_hash : {local_uncle_hash}\n"
f" - header uncle_hash: {block.header.uncles_hash}")
def validate_header(cls, header: BlockHeaderAPI,
parent_header: BlockHeaderAPI) -> None:
if parent_header is None:
# to validate genesis header, check if it equals canonical header at block number 0
raise ValidationError(
"Must have access to parent header to validate current header")
else:
validate_length_lte(header.extra_data,
cls.extra_data_max_bytes,
title="BlockHeader.extra_data")
validate_gas_limit(header.gas_limit, parent_header.gas_limit)
if header.block_number != parent_header.block_number + 1:
raise ValidationError(
"Blocks must be numbered consecutively. "
f"Block number #{header.block_number} "
f"has parent #{parent_header.block_number}")
# timestamp
if header.timestamp <= parent_header.timestamp:
raise ValidationError(
"timestamp must be strictly later than parent, "
f"but is {parent_header.timestamp - header.timestamp} seconds before.\n"
f"- child : {header.timestamp}\n"
f"- parent : {parent_header.timestamp}. ")
def validate_header(
cls, header: BlockHeader, parent_header: BlockHeader, check_seal: bool = True) -> None:
"""
:raise eth.exceptions.ValidationError: if the header is not valid
"""
if parent_header is None:
# to validate genesis header, check if it equals canonical header at block number 0
raise ValidationError("Must have access to parent header to validate current header")
else:
validate_length_lte(header.extra_data, 32, title="BlockHeader.extra_data")
validate_gas_limit(header.gas_limit, parent_header.gas_limit)
if header.block_number != parent_header.block_number + 1:
raise ValidationError(
"Blocks must be numbered consecutively. Block number #{} has parent #{}".format(
header.block_number,
parent_header.block_number,
)
)
# timestamp
if header.timestamp <= parent_header.timestamp:
raise ValidationError(
"timestamp must be strictly later than parent, but is {} seconds before.\n"
"- child : {}\n"
"- parent : {}. ".format(
parent_header.timestamp - header.timestamp,
header.timestamp,
parent_header.timestamp,
)
)
if check_seal:
cls.validate_seal(header)
def validate_block(self, block: BaseBlock) -> None:
"""
Validate the the given block.
"""
if not isinstance(block, self.get_block_class()):
raise ValidationError(
"This vm ({0!r}) is not equipped to validate a block of type {1!r}".format(
self,
block,
)
)
if block.is_genesis:
validate_length_lte(block.header.extra_data, 32, title="BlockHeader.extra_data")
else:
parent_header = get_parent_header(block.header, self.chaindb)
self.validate_header(block.header, parent_header)
tx_root_hash, _ = make_trie_root_and_nodes(block.transactions)
if tx_root_hash != block.header.transaction_root:
raise ValidationError(
"Block's transaction_root ({0}) does not match expected value: {1}".format(
block.header.transaction_root, tx_root_hash))
if len(block.uncles) > MAX_UNCLES:
raise ValidationError(
"Blocks may have a maximum of {0} uncles. Found "
"{1}.".format(MAX_UNCLES, len(block.uncles))
)
if not self.chaindb.exists(block.header.state_root):
raise ValidationError(
"`state_root` was not found in the db.\n"
"- state_root: {0}".format(
block.header.state_root,
)
)
local_uncle_hash = keccak(rlp.encode(block.uncles))
if local_uncle_hash != block.header.uncles_hash:
raise ValidationError(
"`uncles_hash` and block `uncles` do not match.\n"
" - num_uncles : {0}\n"
" - block uncle_hash : {1}\n"
" - header uncle_hash: {2}".format(
len(block.uncles),
local_uncle_hash,
block.header.uncles_hash,
)
)
def validate_header(cls,
header: BlockHeaderAPI,
parent_header: BlockHeaderAPI,
check_seal: bool = True) -> None:
"""
:raise eth.exceptions.ValidationError: if the header is not valid
"""
if parent_header is None:
# to validate genesis header, check if it equals canonical header at block number 0
raise ValidationError(
"Must have access to parent header to validate current header")
else:
validate_length_lte(header.extra_data,
32,
title="BlockHeader.extra_data")
validate_gas_limit(header.gas_limit, parent_header.gas_limit)
if header.block_number != parent_header.block_number + 1:
raise ValidationError(
"Blocks must be numbered consecutively. "
f"Block number #{header.block_number} "
f"has parent #{parent_header.block_number}")
# timestamp
if header.timestamp <= parent_header.timestamp:
raise ValidationError(
"timestamp must be strictly later than parent, "
f"but is {parent_header.timestamp - header.timestamp} seconds before.\n"
f"- child : {header.timestamp}\n"
f"- parent : {parent_header.timestamp}. ")
if check_seal:
try:
cls.validate_seal(header)
except ValidationError:
cls.cls_logger.warning(
"Failed to validate header proof of work on header: %r",
header.as_dict())
raise
def validate_max_packet_size(encoded_packet: bytes) -> None:
validate_length_lte(encoded_packet, MAX_PACKET_SIZE, "packet")
def test_validate_length_lte(value, maximum_length, is_valid):
if is_valid:
validate_length_lte(value, maximum_length)
else:
with pytest.raises(ValidationError):
validate_length_lte(value, maximum_length)