io.gatling.http.response.ResponseBody.scala Maven / Gradle / Ivy

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/**
 * Copyright 2011-2014 eBusiness Information, Groupe Excilys (www.ebusinessinformation.fr)
 *
 * 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 io.gatling.http.response

import java.io.{ ByteArrayInputStream, InputStream }
import java.nio.charset.Charset
import java.nio.charset.StandardCharsets._

import scala.annotation.switch

import org.jboss.netty.buffer.{ ChannelBuffer, ChannelBufferInputStream, ChannelBuffers }

import io.gatling.core.util.FastByteArrayInputStream

sealed trait ResponseBodyUsage
case object StringResponseBodyUsage extends ResponseBodyUsage
case object ByteArrayResponseBodyUsage extends ResponseBodyUsage
case object InputStreamResponseBodyUsage extends ResponseBodyUsage

trait ResponseBodyUsageStrategy {
  def bodyUsage(bodyLength: Int): ResponseBodyUsage
}

object StringResponseBodyUsageStrategy extends ResponseBodyUsageStrategy {
  def bodyUsage(bodyLength: Int) = StringResponseBodyUsage
}

object ByteArrayResponseBodyUsageStrategy extends ResponseBodyUsageStrategy {
  def bodyUsage(bodyLength: Int) = ByteArrayResponseBodyUsage
}

object InputStreamResponseBodyUsageStrategy extends ResponseBodyUsageStrategy {
  def bodyUsage(bodyLength: Int) = InputStreamResponseBodyUsage
}

object ResponseBody {

  val EmptyBytes = new Array[Byte](0)

  private def getBytes(buffer: ChannelBuffer, start: Int, length: Int): Array[Byte] = {
    val array = new Array[Byte](length)
    buffer.getBytes(start, array)
    array
  }

  def chunks2Bytes(chunks: Seq[ChannelBuffer]): Array[Byte] = (chunks.size: @switch) match {

    case 0 => EmptyBytes

    case 1 =>
      val headChunk = chunks.head
      val readableBytes = headChunk.readableBytes
      val readerIndex = headChunk.readerIndex

      if (headChunk.hasArray && headChunk.arrayOffset == 0 && readerIndex == 0 && readableBytes == headChunk.array.length)
        headChunk.array
      else
        getBytes(headChunk, readerIndex, readableBytes)

    case _ =>
      val composite = ChannelBuffers.wrappedBuffer(chunks: _*)
      getBytes(composite, composite.readerIndex, composite.readableBytes)
  }

  def chunks2String(chunks: Seq[ChannelBuffer], charset: Charset): String = (chunks.size: @switch) match {

    case 0 => ""

    case 1 => chunks.head.toString(charset)

    case _ => ChannelBuffers.wrappedBuffer(chunks: _*).toString(charset)
  }
}

sealed trait ResponseBody {
  def string: String
  def bytes: Array[Byte]
  def stream: InputStream
}

object StringResponseBody {

  def apply(chunks: Seq[ChannelBuffer], charset: Charset) = {
    val string = ResponseBody.chunks2String(chunks, charset)
    new StringResponseBody(string, charset)
  }
}

case class StringResponseBody(string: String, charset: Charset) extends ResponseBody {

  lazy val bytes = string.getBytes(charset)
  def stream = new ByteArrayInputStream(bytes)
}

object ByteArrayResponseBody {

  def apply(chunks: Seq[ChannelBuffer], charset: Charset) = {
    val bytes = ResponseBody.chunks2Bytes(chunks)
    new ByteArrayResponseBody(bytes, charset)
  }
}

case class ByteArrayResponseBody(bytes: Array[Byte], charset: Charset) extends ResponseBody {

  def stream = new FastByteArrayInputStream(bytes)
  lazy val string = new String(bytes, charset)
}

case class InputStreamResponseBody(chunks: Seq[ChannelBuffer], charset: Charset) extends ResponseBody {

  var bytesLoaded = false

  def stream = (chunks.size: @switch) match {

    case 0 => new FastByteArrayInputStream(ResponseBody.EmptyBytes)

    case 1 =>
      new ChannelBufferInputStream(chunks.head.duplicate)

    case _ =>
      val composite = ChannelBuffers.wrappedBuffer(chunks.map(_.duplicate): _*)
      new ChannelBufferInputStream(composite)
  }

  lazy val bytes = {
    bytesLoaded = true
    ResponseBody.chunks2Bytes(chunks)
  }

  lazy val string = {
    if (bytesLoaded)
      new String(bytes, charset)
    else
      ResponseBody.chunks2String(chunks, charset)
  }
}

case object NoResponseBody extends ResponseBody {
  val charset = UTF_8
  val bytes = Array.empty[Byte]
  def stream = new FastByteArrayInputStream(bytes)
  val string = ""
}