[SP18.2] Create TestableNetworkStatsProviderCbBinder am: aa2d8a3a

/*

 * Copyright (C) 2020 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.testutils

import android.net.NetworkStats

import android.net.netstats.provider.INetworkStatsProviderCallback

import kotlin.test.assertEquals

import kotlin.test.assertTrue

import kotlin.test.fail

private const val DEFAULT_TIMEOUT_MS = 3000L

open class TestableNetworkStatsProviderCbBinder : INetworkStatsProviderCallback.Stub() {

    sealed class CallbackType {

        data class NotifyStatsUpdated(

            val token: Int,

            val ifaceStats: NetworkStats,

            val uidStats: NetworkStats

        ) : CallbackType()

        object NotifyLimitReached : CallbackType()

        object NotifyAlertReached : CallbackType()

        object Unregister : CallbackType()

    }

    private val history = ArrayTrackRecord<CallbackType>().ReadHead()

    override fun notifyStatsUpdated(token: Int, ifaceStats: NetworkStats, uidStats: NetworkStats) {

        history.add(CallbackType.NotifyStatsUpdated(token, ifaceStats, uidStats))

    }

    override fun notifyLimitReached() {

        history.add(CallbackType.NotifyLimitReached)

    }

    override fun notifyAlertReached() {

        history.add(CallbackType.NotifyAlertReached)

    }

    override fun unregister() {

        history.add(CallbackType.Unregister)

    }

    fun expectNotifyStatsUpdated() {

        val event = history.poll(DEFAULT_TIMEOUT_MS)

        assertTrue(event is CallbackType.NotifyStatsUpdated)

    }

    fun expectNotifyStatsUpdated(ifaceStats: NetworkStats, uidStats: NetworkStats) {

        val event = history.poll(DEFAULT_TIMEOUT_MS)!!

        if (event !is CallbackType.NotifyStatsUpdated) {

            throw Exception("Expected NotifyStatsUpdated callback, but got ${event::class}")

        }

        // TODO: verify token.

        assertNetworkStatsEquals(ifaceStats, event.ifaceStats)

        assertNetworkStatsEquals(uidStats, event.uidStats)

    }

    fun expectNotifyLimitReached() =

            assertEquals(CallbackType.NotifyLimitReached, history.poll(DEFAULT_TIMEOUT_MS))

    fun expectNotifyAlertReached() =

            assertEquals(CallbackType.NotifyAlertReached, history.poll(DEFAULT_TIMEOUT_MS))

    // Assert there is no callback in current queue.

    fun assertNoCallback() {

        val cb = history.poll(0)

        cb?.let { fail("Expected no callback but got $cb") }

    }

}