def validate_seal(self, header: BlockHeaderAPI) -> None:
try:
self._consensus.validate_seal(header)
except ValidationError as exc:
self.cls_logger.debug(
"Failed to validate seal on header: %r. Error: %s",
header.as_dict(),
exc,
)
raise
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. 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:
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_header(self,
header: BlockHeaderAPI,
parent_header: BlockHeaderAPI,
check_seal: bool = True) -> 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, self.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}. "
)
if check_seal:
try:
self.validate_seal(header)
except ValidationError as exc:
self.cls_logger.warning(
"Failed to validate seal on header: %r. Error: %s",
header.as_dict(),
exc,
)
raise