def new_block(block, use_parent=True):
"""Create a new block based on a parent block.
The block will not include any transactions and will not be finalized.
"""
parent = block.get_parent()
header = BlockHeader(prevhash=parent.hash,
uncles_hash=utils.sha3(rlp.encode([])),
coinbase=block.coinbase,
state_root=parent.state_root if use_parent else block.state_root,
tx_list_root=trie.BLANK_ROOT,
receipts_root=trie.BLANK_ROOT,
bloom=0,
difficulty=block.difficulty,
mixhash='',
number=parent.number + 1,
gas_limit=block.gas_limit,
gas_used=0,
timestamp=block.timestamp,
extra_data=block.extra_data,
nonce=b'')
block = Block(header, [], [], env=parent.env if use_parent else block.env,
parent=parent, making=True)
block.ancestor_hashes = [parent.hash] + parent.ancestor_hashes
block.log_listeners = parent.log_listeners
return block
def to_block(self, env, parent=None):
"""Convert the transient block to a :class:`ethereum.blocks.Block`"""
return Block(self.header,
self.transaction_list,
self.uncles,
env=env,
parent=parent)
def __init__(self):
env = Env(DB())
header = BlockHeader(difficulty=DIFFICULTY)
self.head_candidate = Block(header, env=env)