cli.py

#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause

import argparse
import json
import os
import pathlib
import pprint
import sys
import textwrap

sys.path.append(pathlib.Path(__file__).resolve().parent.as_posix())
from lib import YnlFamily, Netlink, NlError, SpecFamily

sys_schema_dir='/usr/share/ynl'
relative_schema_dir='../../../../Documentation/netlink'

def schema_dir():
    script_dir = os.path.dirname(os.path.abspath(__file__))
    schema_dir = os.path.abspath(f"{script_dir}/{relative_schema_dir}")
    if not os.path.isdir(schema_dir):
        schema_dir = sys_schema_dir
    if not os.path.isdir(schema_dir):
        raise Exception(f"Schema directory {schema_dir} does not exist")
    return schema_dir

def spec_dir():
    spec_dir = schema_dir() + '/specs'
    if not os.path.isdir(spec_dir):
        raise Exception(f"Spec directory {spec_dir} does not exist")
    return spec_dir


class YnlEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, bytes):
            return bytes.hex(obj)
        if isinstance(obj, set):
            return list(obj)
        return json.JSONEncoder.default(self, obj)


def print_attr_list(ynl, attr_names, attr_set, indent=2):
    """Print a list of attributes with their types and documentation."""
    prefix = ' ' * indent
    for attr_name in attr_names:
        if attr_name in attr_set.attrs:
            attr = attr_set.attrs[attr_name]
            attr_info = f'{prefix}- {attr_name}: {attr.type}'
            if 'enum' in attr.yaml:
                enum_name = attr.yaml['enum']
                attr_info += f" (enum: {enum_name})"
                # Print enum values if available
                if enum_name in ynl.consts:
                    const = ynl.consts[enum_name]
                    enum_values = list(const.entries.keys())
                    attr_info += f"\n{prefix}  {const.type.capitalize()}: {', '.join(enum_values)}"

            # Show nested attributes reference and recursively display them
            nested_set_name = None
            if attr.type == 'nest' and 'nested-attributes' in attr.yaml:
                nested_set_name = attr.yaml['nested-attributes']
                attr_info += f" -> {nested_set_name}"

            if attr.yaml.get('doc'):
                doc_text = textwrap.indent(attr.yaml['doc'], prefix + '  ')
                attr_info += f"\n{doc_text}"
            print(attr_info)

            # Recursively show nested attributes
            if nested_set_name in ynl.attr_sets:
                nested_set = ynl.attr_sets[nested_set_name]
                # Filter out 'unspec' and other unused attrs
                nested_names = [n for n in nested_set.attrs.keys()
                                if nested_set.attrs[n].type != 'unused']
                if nested_names:
                    print_attr_list(ynl, nested_names, nested_set, indent + 4)


def print_mode_attrs(ynl, mode, mode_spec, attr_set, print_request=True):
    """Print a given mode (do/dump/event/notify)."""
    mode_title = mode.capitalize()

    if print_request and 'request' in mode_spec and 'attributes' in mode_spec['request']:
        print(f'\n{mode_title} request attributes:')
        print_attr_list(ynl, mode_spec['request']['attributes'], attr_set)

    if 'reply' in mode_spec and 'attributes' in mode_spec['reply']:
        print(f'\n{mode_title} reply attributes:')
        print_attr_list(ynl, mode_spec['reply']['attributes'], attr_set)

    if 'attributes' in mode_spec:
        print(f'\n{mode_title} attributes:')
        print_attr_list(ynl, mode_spec['attributes'], attr_set)


def main():
    description = """
    YNL CLI utility - a general purpose netlink utility that uses YAML
    specs to drive protocol encoding and decoding.
    """
    epilog = """
    The --multi option can be repeated to include several do operations
    in the same netlink payload.
    """

    parser = argparse.ArgumentParser(description=description,
                                     epilog=epilog)
    spec_group = parser.add_mutually_exclusive_group(required=True)
    spec_group.add_argument('--family', dest='family', type=str,
                            help='name of the netlink FAMILY')
    spec_group.add_argument('--list-families', action='store_true',
                            help='list all netlink families supported by YNL (has spec)')
    spec_group.add_argument('--spec', dest='spec', type=str,
                            help='choose the family by SPEC file path')

    parser.add_argument('--schema', dest='schema', type=str)
    parser.add_argument('--no-schema', action='store_true')
    parser.add_argument('--json', dest='json_text', type=str)

    group = parser.add_mutually_exclusive_group()
    group.add_argument('--do', dest='do', metavar='DO-OPERATION', type=str)
    group.add_argument('--multi', dest='multi', nargs=2, action='append',
                       metavar=('DO-OPERATION', 'JSON_TEXT'), type=str)
    group.add_argument('--dump', dest='dump', metavar='DUMP-OPERATION', type=str)
    group.add_argument('--list-ops', action='store_true')
    group.add_argument('--list-msgs', action='store_true')
    group.add_argument('--list-attrs', dest='list_attrs', metavar='OPERATION', type=str,
                       help='List attributes for an operation')
    group.add_argument('--validate', action='store_true')

    parser.add_argument('--duration', dest='duration', type=int,
                        help='when subscribed, watch for DURATION seconds')
    parser.add_argument('--sleep', dest='duration', type=int,
                        help='alias for duration')
    parser.add_argument('--subscribe', dest='ntf', type=str)
    parser.add_argument('--replace', dest='flags', action='append_const',
                        const=Netlink.NLM_F_REPLACE)
    parser.add_argument('--excl', dest='flags', action='append_const',
                        const=Netlink.NLM_F_EXCL)
    parser.add_argument('--create', dest='flags', action='append_const',
                        const=Netlink.NLM_F_CREATE)
    parser.add_argument('--append', dest='flags', action='append_const',
                        const=Netlink.NLM_F_APPEND)
    parser.add_argument('--process-unknown', action=argparse.BooleanOptionalAction)
    parser.add_argument('--output-json', action='store_true')
    parser.add_argument('--dbg-small-recv', default=0, const=4000,
                        action='store', nargs='?', type=int)
    args = parser.parse_args()

    def output(msg):
        if args.output_json:
            print(json.dumps(msg, cls=YnlEncoder))
        else:
            pprint.PrettyPrinter().pprint(msg)

    if args.list_families:
        for filename in sorted(os.listdir(spec_dir())):
            if filename.endswith('.yaml'):
                print(filename.removesuffix('.yaml'))
        return

    if args.no_schema:
        args.schema = ''

    attrs = {}
    if args.json_text:
        attrs = json.loads(args.json_text)

    if args.family:
        spec = f"{spec_dir()}/{args.family}.yaml"
    else:
        spec = args.spec
    if not os.path.isfile(spec):
        raise Exception(f"Spec file {spec} does not exist")

    if args.validate:
        try:
            SpecFamily(spec, args.schema)
        except Exception as error:
            print(error)
            exit(1)
        return

    if args.family: # set behaviour when using installed specs
        if args.schema is None and spec.startswith(sys_schema_dir):
            args.schema = '' # disable schema validation when installed
        if args.process_unknown is None:
            args.process_unknown = True

    ynl = YnlFamily(spec, args.schema, args.process_unknown,
                    recv_size=args.dbg_small_recv)
    if args.dbg_small_recv:
        ynl.set_recv_dbg(True)

    if args.ntf:
        ynl.ntf_subscribe(args.ntf)

    if args.list_ops:
        for op_name, op in ynl.ops.items():
            print(op_name, " [", ", ".join(op.modes), "]")
    if args.list_msgs:
        for op_name, op in ynl.msgs.items():
            print(op_name, " [", ", ".join(op.modes), "]")

    if args.list_attrs:
        op = ynl.msgs.get(args.list_attrs)
        if not op:
            print(f'Operation {args.list_attrs} not found')
            exit(1)

        print(f'Operation: {op.name}')
        print(op.yaml['doc'])

        for mode in ['do', 'dump', 'event']:
            if mode in op.yaml:
                print_mode_attrs(ynl, mode, op.yaml[mode], op.attr_set, True)

        if 'notify' in op.yaml:
            mode_spec = op.yaml['notify']
            ref_spec = ynl.msgs.get(mode_spec).yaml.get('do')
            if ref_spec:
                print_mode_attrs(ynl, 'notify', ref_spec, op.attr_set, False)

        if 'mcgrp' in op.yaml:
            print(f"\nMulticast group: {op.yaml['mcgrp']}")

    try:
        if args.do:
            reply = ynl.do(args.do, attrs, args.flags)
            output(reply)
        if args.dump:
            reply = ynl.dump(args.dump, attrs)
            output(reply)
        if args.multi:
            ops = [ (item[0], json.loads(item[1]), args.flags or []) for item in args.multi ]
            reply = ynl.do_multi(ops)
            output(reply)

        if args.ntf:
            for msg in ynl.poll_ntf(duration=args.duration):
                output(msg)
    except NlError as e:
        print(e)
        exit(1)
    except KeyboardInterrupt:
        pass
    except BrokenPipeError:
        pass


if __name__ == "__main__":
    main()