def listener():
""" Listener for Sawtooth State changes
"""
try:
database = Database()
subscriber = Subscriber(VALIDATOR)
database.connect()
subscriber.add_handler(get_delta_handler(database))
known_blocks = database.get_last_known_blocks()
subscriber.start(known_blocks)
LOGGER.info("Listening for Sawtooth state changes")
except Exception as err: # pylint: disable=broad-except
LOGGER.exception("Outbound listener %s exception", type(err).__name__)
LOGGER.exception(err)
finally:
try:
database.disconnect()
except UnboundLocalError:
pass
try:
subscriber.stop()
except UnboundLocalError:
pass
def main():
try:
opts = parse_args(sys.argv[1:])
init_logger(opts.verbose)
LOGGER.info("Starting Ledger Sync...")
database = Database(opts.db_host, opts.db_port, opts.db_name)
database.connect()
subscriber = Subscriber(opts.validator)
subscriber.add_handler(get_delta_handler(database))
known_blocks = get_last_known_blocks(database)
subscriber.start(known_blocks)
except KeyboardInterrupt:
sys.exit(0)
except Exception as err: # pylint: disable=broad-except
LOGGER.exception(err)
sys.exit(1)
finally:
try:
subscriber.stop()
except UnboundLocalError:
pass
try:
database.disconnect()
except UnboundLocalError:
pass
LOGGER.info("Ledger Sync shut down successfully")