z_get_liveliness.py

#
# Copyright (c) 2022 ZettaScale Technology
#
# This program and the accompanying materials are made available under the
# terms of the Eclipse Public License 2.0 which is available at
# http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
# which is available at https://www.apache.org/licenses/LICENSE-2.0.
#
# SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
#
# Contributors:
#   ZettaScale Zenoh Team, <zenoh@zettascale.tech>
#
import zenoh


def main(conf: zenoh.Config, key: str, timeout: float):
    # initiate logging
    zenoh.init_log_from_env_or("error")

    print("Opening session...")
    with zenoh.open(conf) as session:
        print(f"Sending Liveliness Query '{key}'...")
        replies = session.liveliness().get(key, timeout=timeout)
        for reply in replies:
            try:
                print(f">> Alive token ('{reply.ok.key_expr}')")
            except:
                print(f">> Received (ERROR: '{reply.err.payload.to_string()}')")


# --- Command line argument parsing --- --- --- --- --- ---
if __name__ == "__main__":
    import argparse

    import common

    parser = argparse.ArgumentParser(
        prog="z_get_liveliness", description="zenoh put example"
    )
    common.add_config_arguments(parser)
    parser.add_argument(
        "--key",
        "-k",
        dest="key",
        default="group1/**",
        type=str,
        help="The key expression to write.",
    )
    parser.add_argument(
        "--timeout",
        "-o",
        dest="timeout",
        default=10.0,
        type=float,
        help="The query timeout.",
    )

    args = parser.parse_args()
    conf = common.get_config_from_args(args)

    main(conf, args.key, args.timeout)