7995b438eb
Add an ArpResponder based on a generic PacketResponder class, and a TestHttpServer based on NanoHttpd. Test: tests based on these utilities Bug: 160617623 Bug: 160656765 Change-Id: I50b872a8b23e8df997e8f62f0adc7c0256c4d74d
75 lines
2.4 KiB
Kotlin
75 lines
2.4 KiB
Kotlin
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.testutils
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import java.util.function.Predicate
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private const val POLL_FREQUENCY_MS = 1000L
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/**
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* A class that can be used to reply to packets from a [TapPacketReader].
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*
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* A reply thread will be created to reply to incoming packets asynchronously.
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* The receiver creates a new read head on the [TapPacketReader], to read packets, so it does not
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* affect packets obtained through [TapPacketReader.popPacket].
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*
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* @param reader a [TapPacketReader] to obtain incoming packets and reply to them.
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* @param packetFilter A filter to apply to incoming packets.
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* @param name Name to use for the internal responder thread.
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*/
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abstract class PacketResponder(
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private val reader: TapPacketReader,
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private val packetFilter: Predicate<ByteArray>,
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name: String
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) {
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private val replyThread = ReplyThread(name)
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protected abstract fun replyToPacket(packet: ByteArray, reader: TapPacketReader)
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/**
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* Start the [PacketResponder].
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*/
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fun start() {
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replyThread.start()
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}
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/**
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* Stop the [PacketResponder].
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*
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* The responder cannot be used anymore after being stopped.
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*/
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fun stop() {
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replyThread.interrupt()
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}
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private inner class ReplyThread(name: String) : Thread(name) {
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override fun run() {
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try {
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// Create a new ReadHead so other packets polled on the reader are not affected
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val recvPackets = reader.receivedPackets.newReadHead()
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while (!isInterrupted) {
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recvPackets.poll(POLL_FREQUENCY_MS, packetFilter::test)?.let {
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replyToPacket(it, reader)
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}
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}
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} catch (e: InterruptedException) {
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// Exit gracefully
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}
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}
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}
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}
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