xrd_subsystems.py

#!/usr/bin/python3

"""List X-Road Subsystems."""

import argparse
import sys
import xrdinfo

# Default timeout for HTTP requests
DEFAULT_TIMEOUT = 5.0


def print_error(content):
    """Error printer."""
    sys.stderr.write(f'ERROR: {content}\n')


def main():
    """Main function"""
    parser = argparse.ArgumentParser(
        description='List X-Road Subsystems.',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog='You need to provide either Security Server or Central Server address.\n\n'
               'NB! Global configuration signature is not validated when using Central Server.\n'
               'Use local Security Server whenever possible.'
    )
    parser.add_argument(
        '-s', metavar='SECURITY_SERVER', help='DNS name/IP/URL of local Security Server')
    parser.add_argument(
        '-c', metavar='CENTRAL_SERVER',
        help='DNS name/IP/URL of Central Server/Configuration Proxy')
    parser.add_argument('-t', metavar='TIMEOUT', help='timeout for HTTP query', type=float)
    parser.add_argument(
        '--verify', metavar='CERT_PATH',
        help='validate peer TLS certificate using CA certificate file.')
    parser.add_argument(
        '--cert', metavar='CERT_PATH', help='use TLS certificate for HTTPS requests.')
    parser.add_argument('--key', metavar='KEY_PATH', help='private key for TLS certificate.')
    parser.add_argument(
        '--instance', metavar='INSTANCE',
        help='use this instance instead of local X-Road instance (works only with "-s" argument)')
    args = parser.parse_args()

    instance = None
    if args.instance:
        instance = args.instance

    timeout = DEFAULT_TIMEOUT
    if args.t:
        timeout = args.t

    verify = False
    if args.verify:
        verify = args.verify

    cert = None
    if args.cert and args.key:
        cert = (args.cert, args.key)

    if args.s:
        try:
            shared_params = xrdinfo.shared_params_ss(
                addr=args.s, instance=instance, timeout=timeout, verify=verify, cert=cert)
        except xrdinfo.XrdInfoError as err:
            print_error(err)
            sys.exit(1)
    elif args.c:
        try:
            shared_params = xrdinfo.shared_params_cs(
                addr=args.c, timeout=timeout, verify=verify, cert=cert)
        except xrdinfo.XrdInfoError as err:
            print_error(err)
            sys.exit(1)
    else:
        parser.print_help()
        sys.exit(1)

    try:
        for subsystem in xrdinfo.subsystems(shared_params):
            print(xrdinfo.identifier(subsystem))
    except xrdinfo.XrdInfoError as err:
        print_error(err)
        sys.exit(1)


if __name__ == '__main__':
    main()