def is_database_initialized(chaindb: AsyncChainDB) -> bool:
try:
chaindb.get_canonical_head()
except CanonicalHeadNotFound:
# empty chain database
return False
else:
return True
def initialize_database(chain_config: ChainConfig,
chaindb: AsyncChainDB) -> None:
try:
chaindb.get_canonical_head()
except CanonicalHeadNotFound:
if chain_config.network_id == ROPSTEN_NETWORK_ID:
# We're starting with a fresh DB.
chaindb.persist_header(ROPSTEN_GENESIS_HEADER)
elif chain_config.network_id == MAINNET_NETWORK_ID:
chaindb.persist_header(MAINNET_GENESIS_HEADER)
else:
# TODO: add genesis data to ChainConfig and if it's present, use it
# here to initialize the chain.
raise NotImplementedError(
"Only the mainnet and ropsten chains are currently supported")