def listener():
""" Listener for Sawtooth State changes
"""
try:
database = Database()
database.connect()
LOGGER.info("Reading queued Sawtooth transactions")
while True:
feed = database.run_query(database.get_table("inbound_queue"))
count = 0
for rec in feed:
process(rec, database)
count = count + 1
if count == 0:
break
LOGGER.info("Processed %s records in the inbound queue", count)
LOGGER.info("Listening for incoming Sawtooth transactions")
feed = database.run_query(
database.get_table("inbound_queue").changes())
for rec in feed:
if rec["new_val"] and not rec["old_val"]: # only insertions
process(rec["new_val"], database)
except Exception as err: # pylint: disable=broad-except
LOGGER.exception("Inbound listener %s exception", type(err).__name__)
LOGGER.exception(err)
finally:
try:
database.disconnect()
except UnboundLocalError:
pass
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")