/*
 * 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.
 */

package com.android.intentresolver.util

import android.os.CancellationSignal
import kotlinx.coroutines.CoroutineStart
import kotlinx.coroutines.awaitCancellation
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.launch

/**
 * Invokes [block] with a [CancellationSignal] that is bound to this coroutine's lifetime; if this
 * coroutine is cancelled, then [CancellationSignal.cancel] is promptly invoked.
 */
suspend fun <R> withCancellationSignal(block: suspend (signal: CancellationSignal) -> R): R =
    coroutineScope {
        val signal = CancellationSignal()
        val signalJob =
            launch(start = CoroutineStart.UNDISPATCHED) {
                try {
                    awaitCancellation()
                } finally {
                    signal.cancel()
                }
            }
        block(signal).also { signalJob.cancel() }
    }