libflags/lib.rs

//
// Copyright (C) 2021 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.
//

//! This module implements safe wrappers for GetServerConfigurableFlag method
//! from libflags.

pub use ffi::GetServerConfigurableFlag;

#[cxx::bridge]
mod ffi {
    unsafe extern "C++" {
        include!("rust_get_flags.hpp");

        /// Use the category name and flag name registered in SettingsToPropertiesMapper.java
        /// to query the experiment flag value. This method will return default_value if
        /// querying fails.
        /// Note that for flags from Settings.Global, experiment_category_name should
        /// always be global_settings.
        fn GetServerConfigurableFlag(
            experiment_category_name: &str,
            experiment_flag_name: &str,
            default_value: &str,
        ) -> String;
    }
}