def from_header(cls, header: BlockHeaderAPI,
chaindb: ChainDatabaseAPI) -> "FrontierBlock":
"""
Returns the block denoted by the given block header.
:raise eth.exceptions.BlockNotFound: if transactions or uncle headers are missing
"""
if header.uncles_hash == EMPTY_UNCLE_HASH:
uncles: Tuple[BlockHeader, ...] = ()
else:
try:
uncles = chaindb.get_block_uncles(header.uncles_hash)
except HeaderNotFound as exc:
raise BlockNotFound(
f"Uncles not found in database for {header}: {exc}"
) from exc
try:
transactions = chaindb.get_block_transactions(
header, cls.get_transaction_class())
except MissingTrieNode as exc:
raise BlockNotFound(
f"Transactions not found in database for {header}: {exc}"
) from exc
return cls(
header=header,
transactions=transactions,
uncles=uncles,
)
def initialize_database(chain_config: Eth1ChainConfig,
chaindb: ChainDatabaseAPI,
base_db: AtomicDatabaseAPI) -> None:
try:
chaindb.get_canonical_head()
except CanonicalHeadNotFound:
chain_config.initialize_chain(base_db)
def is_database_initialized(chaindb: ChainDatabaseAPI) -> bool:
try:
chaindb.get_canonical_head()
except CanonicalHeadNotFound:
# empty chain database
return False
else:
return True
def from_header(cls, header: BlockHeaderAPI, chaindb: ChainDatabaseAPI) -> "FrontierBlock":
"""
Returns the block denoted by the given block header.
"""
if header.uncles_hash == EMPTY_UNCLE_HASH:
uncles: Tuple[BlockHeader, ...] = ()
else:
uncles = chaindb.get_block_uncles(header.uncles_hash)
transactions = chaindb.get_block_transactions(header, cls.get_transaction_class())
return cls(
header=header,
transactions=transactions,
uncles=uncles,
)
def get_receipts(self,
chaindb: ChainDatabaseAPI) -> Tuple[ReceiptAPI, ...]:
return chaindb.get_receipts(self.header, Receipt)
def get_block_header_by_hash(block_hash: Hash32,
db: ChainDatabaseAPI) -> BlockHeaderAPI:
"""
Returns the header for the parent block.
"""
return db.get_block_header_by_hash(block_hash)