aconfig: Add script to generate finalized flag proto.

package {

    default_applicable_licenses: ["Android-Apache-2.0"],

}

python_binary_host {

    name: "convert_finalized_flags_to_proto",

    srcs: ["convert_finalized_flags_to_proto.py"],

    libs: ["aconfig_internal_proto_python"],

    version: {

        py3: {

            embedded_launcher: true,

        },

    },

}

#!/usr/bin/env python3

#

# Copyright (C) 2024 The Android Open Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import collections

import sys

import os

from io import TextIOWrapper

from protos import aconfig_internal_pb2

from typing import Dict, List, Set

def extract_finalized_flags(flag_file: TextIOWrapper):

  finalized_flags_for_sdk = list()

  for line in f:

    flag_name = line.strip()

    if flag_name:

      finalized_flags_for_sdk.append(flag_name)

  return finalized_flags_for_sdk

def remove_duplicate_flags(all_flags_with_duplicates: Dict[int, List]):

  result_flags = collections.defaultdict(set)

  for api_level in sorted(all_flags_with_duplicates.keys(), key=int):

    for flag in all_flags_with_duplicates[api_level]:

      if not any(flag in value_set for value_set in result_flags.values()):

        result_flags[api_level].add(flag)

  return result_flags

def build_proto(all_flags: Set):

  finalized_flags = aconfig_internal_pb2.finalized_flags()

  for api_level, qualified_name_list in all_flags.items():

    for qualified_name in qualified_name_list:

      package_name, flag_name = qualified_name.rsplit('.', 1)

      finalized_flag = aconfig_internal_pb2.finalized_flag()

      finalized_flag.name = flag_name

      finalized_flag.package = package_name

      finalized_flag.min_sdk = api_level

      finalized_flags.finalized_flag.append(finalized_flag)

  return finalized_flags

if __name__ == '__main__':

  if len(sys.argv) == 1:

    sys.exit('No prebuilts/sdk directory provided.')

  all_api_info_dir = sys.argv[1]

  all_flags_with_duplicates = {}

  for sdk_dir in os.listdir(all_api_info_dir):

    api_level = sdk_dir.rsplit('/', 1)[0].rstrip('0').rstrip('.')

    # No support for minor versions yet. This also removes non-numeric dirs.

    # Update once floats are acceptable.

    if not api_level.isdigit():

      continue

    flag_file_path = os.path.join(all_api_info_dir, sdk_dir, 'finalized-flags.txt')

    try:

      with open(flag_file_path, 'r') as f:

        finalized_flags_for_sdk = extract_finalized_flags(f)

        all_flags_with_duplicates[int(api_level)] = finalized_flags_for_sdk

    except FileNotFoundError:

      # Either this version is not finalized yet or looking at a

      # /prebuilts/sdk/version before finalized-flags.txt was introduced.

      continue

  all_flags = remove_duplicate_flags(all_flags_with_duplicates)

  finalized_flags = build_proto(all_flags)

  sys.stdout.buffer.write(finalized_flags.SerializeToString())

    test_suites: ["general-tests"],

    defaults: ["aconfig_protos.defaults"],

}

// Internal protos

python_library_host {

    name: "aconfig_internal_proto_python",

    srcs: ["protos/aconfig_internal.proto"],

    proto: {

        canonical_path_from_root: false,

    },

}