compos/common/binder.rs

/*
 * Copyright 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.
 */

//! Helper for converting Error types to what Binder expects

use anyhow::Result;
use binder::{ExceptionCode, Result as BinderResult};
use binder_common::new_binder_exception;
use log::warn;
use std::fmt::Debug;

/// Convert a Result<T, E> to BinderResult<T> to allow it to be returned from a binder RPC,
/// preserving the content as far as possible.
/// Also log the error if there is one.
pub fn to_binder_result<T, E: Debug>(result: Result<T, E>) -> BinderResult<T> {
    result.map_err(|e| {
        let message = format!("{:?}", e);
        warn!("Returning binder error: {}", &message);
        new_binder_exception(ExceptionCode::SERVICE_SPECIFIC, message)
    })
}