def _connect_block(block: Block, active_chain: BlockChain, utxo_set: UTXO_Set) -> bool:
"""
Add block after current chain. Return True if block added successfully, else False.
"""
if block.validate_block(active_chain, utxo_set) is None:
return False
logger.info(
f"connecting the {len(active_chain.chain)+1}th block {block.id} to chain {active_chain.idx}"
)
active_chain.chain.append(block)
# Minipulate transactions in this block.
# Remove txin from utxo_set, add txout to utxo_set.
for tx in block.txns:
if not tx.is_coinbase:
for txin in tx.txins:
utxo_set.rm_from_utxo(*txin.to_spend)
for i, txout in enumerate(tx.txouts):
utxo_set.add_to_utxo(
txout, tx, i, tx.is_coinbase, len(active_chain.chain)
)
return True
def check_block_place(
cls,
block: Block,
active_chain: BlockChain,
utxo_set: BaseUTXO_Set,
mempool: BaseMemPool,
side_branches: Iterable[BlockChain],
) -> int:
if Block.locate_block(block.id, active_chain, side_branches)[0]:
logger.debug(
f"[p2p] ignore block that already be seen: {block.id}")
return None # already seen block
try:
chain_idx = block.validate_block(active_chain, utxo_set, mempool,
side_branches)
except BlockValidationError as e:
if e.to_orphan:
logger.info(
f"[p2p] block {block.id} failed validation as an orphan block"
)
return -1 # orphan block
else:
logger.exception(
f"[p2p] block {block.id} failed validation due to internal error in this block"
)
return -2 # Internal error in this block
if chain_idx != Params.ACTIVE_CHAIN_IDX and len(
side_branches) < chain_idx:
logger.info(
f"[p2p] creating a new side branch (idx {chain_idx}) for block {block.id}"
)
side_branches.append(BlockChain(idx=chain_idx, chain=[]))
prev_block, prev_block_height, prev_block_chain_idx = Block.locate_block(
block.prev_block_hash, active_chain, side_branches)
if prev_block_chain_idx != Params.ACTIVE_CHAIN_IDX: # branch of a branch
logger.info(
f"[p2p] branch (idx {chain_idx}) of an existing side branch (idx {prev_block_chain_idx}) for block {block.id}"
)
branch_fork_height = Block.locate_block(
block.prev_block_hash,
side_branches[prev_block_chain_idx - 1])[1]
side_branches[chain_idx - 1].chain = list(
side_branches[prev_block_chain_idx -
1].chain[:branch_fork_height])
return chain_idx
def _connect_block(block: Block, active_chain: BlockChain,
utxo_set: UTXO_Set) -> bool:
if block.validate_block(active_chain, utxo_set) is None:
return False
logger.info(
f'connecting the {len(active_chain.chain)+1}th block {block.id} to chain {active_chain.idx}'
)
active_chain.chain.append(block)
for tx in block.txns:
if not tx.is_coinbase:
for txin in tx.txins:
utxo_set.rm_from_utxo(*txin.to_spend)
for i, txout in enumerate(tx.txouts):
utxo_set.add_to_utxo(txout, tx, i, tx.is_coinbase,
len(active_chain.chain))
return True