Akka/Scala example source code file (NetworkFailureSpec.scala)

This example Akka source code file (NetworkFailureSpec.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

akka, atomicboolean, bytespersecond, concurrent, delaymillis, deny, duration, future, networkfailurespec, processbuilder, remote, tcp, test, testing, testkit, throwable

The NetworkFailureSpec.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.remote

import org.scalatest.{ BeforeAndAfterAll, BeforeAndAfterEach }

import akka.actor.Actor
import akka.testkit.AkkaSpec
import akka.testkit.DefaultTimeout

import java.util.concurrent.{ TimeUnit, CountDownLatch }
import java.util.concurrent.atomic.AtomicBoolean
import scala.concurrent.{ ExecutionContext, Future }

trait NetworkFailureSpec extends DefaultTimeout { self: AkkaSpec ⇒
  import Actor._
  import scala.concurrent.duration.Duration

  import system.dispatcher

  val BytesPerSecond = "60KByte/s"
  val DelayMillis = "350ms"
  val PortRange = "1024-65535"

  def replyWithTcpResetFor(duration: Duration, dead: AtomicBoolean) = {
    Future {
      try {
        enableTcpReset()
        println("===>>> Reply with [TCP RST] for [" + duration + "]")
        Thread.sleep(duration.toMillis)
        restoreIP
      } catch {
        case e: Throwable ⇒
          dead.set(true)
          e.printStackTrace
      }
    }
  }

  def throttleNetworkFor(duration: Duration, dead: AtomicBoolean) = {
    Future {
      try {
        enableNetworkThrottling()
        println("===>>> Throttling network with [" + BytesPerSecond + ", " + DelayMillis + "] for [" + duration + "]")
        Thread.sleep(duration.toMillis)
        restoreIP
      } catch {
        case e: Throwable ⇒
          dead.set(true)
          e.printStackTrace
      }
    }
  }

  def dropNetworkFor(duration: Duration, dead: AtomicBoolean) = {
    Future {
      try {
        enableNetworkDrop()
        println("===>>> Blocking network [TCP DENY] for [" + duration + "]")
        Thread.sleep(duration.toMillis)
        restoreIP
      } catch {
        case e: Throwable ⇒
          dead.set(true)
          e.printStackTrace
      }
    }
  }

  def sleepFor(duration: Duration) = {
    println("===>>> Sleeping for [" + duration + "]")
    Thread sleep (duration.toMillis)
  }

  def enableNetworkThrottling() = {
    restoreIP()
    assert(new ProcessBuilder("ipfw", "add", "pipe", "1", "ip", "from", "any", "to", "any").start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "add", "pipe", "2", "ip", "from", "any", "to", "any").start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "pipe", "1", "config", "bw", BytesPerSecond, "delay", DelayMillis).start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "pipe", "2", "config", "bw", BytesPerSecond, "delay", DelayMillis).start.waitFor == 0)
  }

  def enableNetworkDrop() = {
    restoreIP()
    assert(new ProcessBuilder("ipfw", "add", "1", "deny", "tcp", "from", "any", "to", "any", PortRange).start.waitFor == 0)
  }

  def enableTcpReset() = {
    restoreIP()
    assert(new ProcessBuilder("ipfw", "add", "1", "reset", "tcp", "from", "any", "to", "any", PortRange).start.waitFor == 0)
  }

  def restoreIP() = {
    println("===>>> Restoring network")
    assert(new ProcessBuilder("ipfw", "del", "pipe", "1").start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "del", "pipe", "2").start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "flush").start.waitFor == 0)
    assert(new ProcessBuilder("ipfw", "pipe", "flush").start.waitFor == 0)
  }
}