def configure_homestead_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
with vm.block.header.build_changeset(**header_params) as changeset:
if 'timestamp' in header_params and changeset.block_number > 0:
parent_header = get_parent_header(changeset.build_rlp(),
vm.chaindb)
changeset.difficulty = compute_homestead_difficulty(
parent_header,
header_params['timestamp'],
)
# In geth the modification of the state in the DAO fork block is performed
# before any transactions are applied, so doing it here is the closest we
# get to that. Another alternative would be to do it in Block.mine(), but
# there we'd need to manually instantiate the State and update
# header.state_root after we're done.
if vm.support_dao_fork and changeset.block_number == vm.dao_fork_block_number:
state = vm.state
with state.mutable_state_db() as state_db:
for account in dao_drain_list:
account = decode_hex(account)
balance = state_db.get_balance(account)
state_db.delta_balance(dao_refund_contract, balance)
state_db.set_balance(account, 0)
# Update state_root manually
changeset.state_root = state.state_root
header = changeset.commit()
return header
def configure_homestead_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
for field_name, value in header_params.items():
setattr(vm.block.header, field_name, value)
if 'timestamp' in header_params and vm.block.header.block_number > 0:
parent_header = get_parent_header(vm.block.header, vm.chaindb)
vm.block.header.difficulty = compute_homestead_difficulty(
parent_header,
header_params['timestamp'],
)
# In geth the modification of the state in the DAO fork block is performed
# before any transactions are applied, so doing it here is the closest we
# get to that. Another alternative would be to do it in Block.mine(), but
# there we'd need to manually instantiate the State and update
# header.state_root after we're done.
if vm.support_dao_fork and vm.block.header.block_number == vm.dao_fork_block_number:
vm_state = vm.state
with vm_state.state_db() as state_db:
for account in dao_drain_list:
account = decode_hex(account)
balance = state_db.get_balance(account)
state_db.delta_balance(dao_refund_contract, balance)
state_db.set_balance(account, 0)
# Update state_root manually
vm.block.header.state_root = vm_state.state_root
return vm.block.header
def configure_homestead_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
for field_name, value in header_params.items():
setattr(vm.block.header, field_name, value)
if 'timestamp' in header_params and vm.block.header.block_number > 0:
parent_header = get_parent_header(vm.block.header, vm.chaindb)
vm.block.header.difficulty = compute_homestead_difficulty(
parent_header,
header_params['timestamp'],
)
# In geth the modification of the state in the DAO fork block is performed
# before any transactions are applied, so doing it here is the closest we
# get to that. Another alternative would be to do it in Block.mine(), but
# there we'd need to manually instantiate the State and update
# header.state_root after we're done.
if vm.support_dao_fork and vm.block.header.block_number == vm.dao_fork_block_number:
with vm.state.state_db() as state_db:
for account in dao_drain_list:
account = decode_hex(account)
balance = state_db.get_balance(account)
state_db.delta_balance(dao_refund_contract, balance)
state_db.set_balance(account, 0)
return vm.block.header
def validate_block(self, block):
if not block.is_genesis:
parent_header = get_parent_header(block.header, self.chaindb)
validate_gas_limit(block.header.gas_limit, parent_header.gas_limit)
validate_length_lte(block.header.extra_data,
32,
title="BlockHeader.extra_data")
# timestamp
if block.header.timestamp < parent_header.timestamp:
raise ValidationError(
"`timestamp` is before the parent block's timestamp.\n"
"- block : {0}\n"
"- parent : {1}. ".format(
block.header.timestamp,
parent_header.timestamp,
))
elif block.header.timestamp == parent_header.timestamp:
raise ValidationError(
"`timestamp` is equal to the parent block's timestamp\n"
"- block : {0}\n"
"- parent: {1}. ".format(
block.header.timestamp,
parent_header.timestamp,
))
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)))
for uncle in block.uncles:
self.validate_uncle(block, uncle)
if not self.state.is_key_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.uncle_hash,
))
def validate_block(self, block):
if not block.is_genesis:
parent_header = get_parent_header(block.header, self.chaindb)
validate_gas_limit(block.header.gas_limit, parent_header.gas_limit)
validate_length_lte(block.header.extra_data, 32, title="BlockHeader.extra_data")
# timestamp
if block.header.timestamp < parent_header.timestamp:
raise ValidationError(
"`timestamp` is before the parent block's timestamp.\n"
"- block : {0}\n"
"- parent : {1}. ".format(
block.header.timestamp,
parent_header.timestamp,
)
)
elif block.header.timestamp == parent_header.timestamp:
raise ValidationError(
"`timestamp` is equal to the parent block's timestamp\n"
"- block : {0}\n"
"- parent: {1}. ".format(
block.header.timestamp,
parent_header.timestamp,
)
)
if len(block.uncles) > MAX_UNCLES:
raise ValidationError(
"Blocks may have a maximum of {0} uncles. Found "
"{1}.".format(MAX_UNCLES, len(block.uncles))
)
for uncle in block.uncles:
self.validate_uncle(block, uncle)
if not self.state.is_key_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.uncle_hash,
)
)
def get_prev_hashes(cls, last_block_hash, db):
if last_block_hash == GENESIS_PARENT_HASH:
return
block_header = get_block_header_by_hash(last_block_hash, db)
for _ in range(MAX_PREV_HEADER_DEPTH):
yield block_header.hash
try:
block_header = get_parent_header(block_header, db)
except (IndexError, BlockNotFound):
break
def get_prev_hashes(cls, last_block_hash, db):
if last_block_hash == GENESIS_PARENT_HASH:
return
block_header = get_block_header_by_hash(last_block_hash, db)
for _ in range(MAX_PREV_HEADER_DEPTH):
yield block_header.hash
try:
block_header = get_parent_header(block_header, db)
except (IndexError, BlockNotFound):
break
def configure_byzantium_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
with vm.block.header.build_changeset(**header_params) as changeset:
if 'timestamp' in header_params and changeset.block_number > 0:
parent_header = get_parent_header(changeset.build_rlp(),
vm.chaindb)
changeset.difficulty = compute_byzantium_difficulty(
parent_header,
header_params['timestamp'],
)
header = changeset.commit()
return header
def configure_byzantium_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
for field_name, value in header_params.items():
setattr(vm.block.header, field_name, value)
if 'timestamp' in header_params and vm.block.header.block_number > 0:
parent_header = get_parent_header(vm.block.header, vm.chaindb)
vm.block.header.difficulty = compute_byzantium_difficulty(
parent_header,
header_params['timestamp'],
)
return vm.block.header
def configure_frontier_header(vm, **header_params):
validate_header_params_for_configuration(header_params)
for field_name, value in header_params.items():
setattr(vm.block.header, field_name, value)
if 'timestamp' in header_params and vm.block.header.block_number > 0:
parent_header = get_parent_header(vm.block.header, vm.chaindb)
vm.block.header.difficulty = compute_frontier_difficulty(
parent_header,
header_params['timestamp'],
)
return vm.block.header
def validate_block(self, block):
"""
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.uncle_hash,
)
)
def get_prev_headers(cls, last_block_hash, db):
prev_headers = []
if last_block_hash == GENESIS_PARENT_HASH:
return prev_headers
block_header = get_block_header_by_hash(last_block_hash, db)
for _ in range(MAX_PREV_HEADER_DEPTH):
prev_headers.append(block_header)
try:
block_header = get_parent_header(block_header, db)
except (IndexError, BlockNotFound):
break
return prev_headers
