def add_block(self, block, forward_pending_transactions=True):
"returns True if block was added sucessfully"
_log = log.bind(block_hash=block)
# make sure we know the parent
if not block.has_parent() and not block.is_genesis():
_log.debug('missing parent')
return False
if not block.validate_uncles():
_log.debug('invalid uncles')
return False
if not len(block.nonce) == 8:
_log.debug('nonce not set')
return False
elif not block.header.check_pow(nonce=block.nonce) and\
not block.is_genesis():
_log.debug('invalid nonce')
return False
if block.has_parent():
try:
processblock.verify(block, block.get_parent())
except processblock.VerificationFailed as e:
_log.critical('VERIFICATION FAILED', error=e)
f = os.path.join(utils.data_dir, 'badblock.log')
open(f, 'w').write(to_string(block.hex_serialize()))
return False
if block.number < self.head.number:
_log.debug("older than head", head_hash=self.head)
# Q: Should we have any limitations on adding blocks?
self.index.add_block(block)
self._store_block(block)
# set to head if this makes the longest chain w/ most work for that number
if block.chain_difficulty() > self.head.chain_difficulty():
_log.debug('new head')
self._update_head(block, forward_pending_transactions)
elif block.number > self.head.number:
_log.warn('has higher blk number than head but lower chain_difficulty',
head_hash=self.head, block_difficulty=block.chain_difficulty(),
head_difficulty=self.head.chain_difficulty())
block.transactions.clear_all()
block.receipts.clear_all()
block.state.db.commit_refcount_changes(block.number)
block.state.db.cleanup(block.number)
self.commit() # batch commits all changes that came with the new block
return True
def _update_head(self, block, forward_pending_transactions=True):
success = True
reverted_blocks = []
if block.number > 0:
b = block.get_parent()
h = self.head
b_children = []
if b.hash != h.hash:
log_chain.warn('reverting')
# revert head back to number of block.parent
while h.number > b.number:
reverted_blocks.append(h)
h = h.get_parent()
# if b's parent is ahead of head
while b.number > h.number:
b_children.append(b)
b = b.get_parent()
# b & h now have same number, wind back one at a time until
# hashes match
while b.hash != h.hash:
reverted_blocks.append(h)
h = h.get_parent()
b_children.append(b)
b = b.get_parent()
for bc in b_children:
success = success and verify(bc, bc.get_parent())
super(Chain, self)._update_head(block, forward_pending_transactions)
# revert the db after chain.head is updated
if success and reverted_blocks and self.revert_block_cb:
self.revert_block_cb(reverted_blocks)
def _update_head(self, block, forward_pending_transactions=True):
log.debug('updating head')
if not block.is_genesis():
#assert self.head.chain_difficulty() < block.chain_difficulty()
if block.get_parent() != self.head:
log.debug('New Head is on a different branch',
head_hash=block,
old_head_hash=self.head)
# Some temporary auditing to make sure pruning is working well
if block.number > 0 and block.number % 500 == 0 and isinstance(
self.db, RefcountDB):
trie.proof.push(trie.RECORDING)
block.to_dict(with_state=True)
n = trie.proof.get_nodelist()
trie.proof.pop()
# log.debug('State size: %d\n' % sum([(len(rlp.encode(a)) + 32) for a in n]))
# Fork detected, revert death row and change logs
if block.number > 0:
b = block.get_parent()
h = self.head
b_children = []
if b.hash != h.hash:
log.warn('reverting')
while h.number > b.number:
h.state.db.revert_refcount_changes(h.number)
h = h.get_parent()
while b.number > h.number:
b_children.append(b)
b = b.get_parent()
while b.hash != h.hash:
h.state.db.revert_refcount_changes(h.number)
h = h.get_parent()
b_children.append(b)
b = b.get_parent()
for bc in b_children:
processblock.verify(bc, bc.get_parent())
self.blockchain.put('HEAD', block.hash)
assert self.blockchain.get('HEAD') == block.hash
self.index.update_blocknumbers(self.head)
assert self.head == block
log.debug('set new head', head=self.head)
self._update_head_candidate(forward_pending_transactions)
if self.new_head_cb and not block.is_genesis():
self.new_head_cb(block)
def _update_head(self, block, forward_pending_transactions=True):
log.debug('updating head')
if not block.is_genesis():
#assert self.head.chain_difficulty() < block.chain_difficulty()
if block.get_parent() != self.head:
log.debug('New Head is on a different branch',
head_hash=block, old_head_hash=self.head)
# Some temporary auditing to make sure pruning is working well
if block.number > 0 and block.number % 500 == 0 and isinstance(self.db, RefcountDB):
trie.proof.push(trie.RECORDING)
block.to_dict(with_state=True)
n = trie.proof.get_nodelist()
trie.proof.pop()
# log.debug('State size: %d\n' % sum([(len(rlp.encode(a)) + 32) for a in n]))
# Fork detected, revert death row and change logs
if block.number > 0:
b = block.get_parent()
h = self.head
b_children = []
if b.hash != h.hash:
log.warn('reverting')
while h.number > b.number:
h.state.db.revert_refcount_changes(h.number)
h = h.get_parent()
while b.number > h.number:
b_children.append(b)
b = b.get_parent()
while b.hash != h.hash:
h.state.db.revert_refcount_changes(h.number)
h = h.get_parent()
b_children.append(b)
b = b.get_parent()
for bc in b_children:
processblock.verify(bc, bc.get_parent())
self.blockchain.put('HEAD', block.hash)
assert self.blockchain.get('HEAD') == block.hash
self.index.update_blocknumbers(self.head)
assert self.head == block
log.debug('set new head', head=self.head)
self._update_head_candidate(forward_pending_transactions)
if self.new_head_cb and not block.is_genesis():
self.new_head_cb(block)
