使用Iteratees使用Play Scala将文件直接上传到S3 chunk-by-chunk

Question

我试图使用Iteratees将文件直接上传到s3。我仍然是函数式编程的新手，并且很难将一些工作代码拼凑在一起。

我编写了一个iteratee，它处理上传文件的块并将它们发送到S3。上传失败，最后出错。

请帮我解决这个问题。

以下是我提出的代码

控制器处理程序

  def uploadFile = Action.async(BodyParser(rh => S3UploadHelper("bucket-name").s3Iteratee() ))  { implicit request =>
    Future {
      if(uploadLogger.isInfoEnabled) uploadLogger.info(s"Contents of Uploaded file :: 
 " + request.body)
      Ok(views.html.index("File uploaded"))
    }
  }

助手班

case class S3UploadHelper(bucket: String, key: String = UUID.generate()) {

  private val AWS_ACCESS_KEY = ""
  private val AWS_SECRET_KEY = ""
  private val yourAWSCredentials = new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY)
  val amazonS3Client = new AmazonS3Client(yourAWSCredentials)


  private val initRequest = new InitiateMultipartUploadRequest(bucket, key)
  private val initResponse = amazonS3Client.initiateMultipartUpload(initRequest)
  val uploadId = initResponse.getUploadId

  val uploadLogger = Logger("upload")

  def s3Iteratee(etags: Seq[PartETag] = Seq.empty[PartETag]): Iteratee[Array[Byte], Either[Result, CompleteMultipartUploadResult]] = Cont {
    case in: El[Array[Byte]] =>
      // Retrieve the part that has not been processed in the previous chunk and copy it in front of the current chunk
      val uploadRequest = new UploadPartRequest()
        .withBucketName(bucket)
        .withKey(key)
        .withPartNumber(etags.length + 1)
        .withUploadId(uploadId)
        .withInputStream(new ByteArrayInputStream(in.e))
        .withPartSize(in.e.length)
      if(uploadLogger.isDebugEnabled) uploadLogger.debug(">> " + String.valueOf(in.e))
      val etag = Future { amazonS3Client.uploadPart(uploadRequest).getPartETag }
      etag.map(etags :+ _)
      Await.result(etag, 1.seconds)
      s3Iteratee(etags)
    case in @ Empty => s3Iteratee(etags)
    case in @ EOF =>
      import scala.collection.JavaConversions._
      val compRequest = new CompleteMultipartUploadRequest(bucket, key, uploadId, etags.toList)
      val result = amazonS3Client.completeMultipartUpload(compRequest)
      Done(Right(result), in)
    case in => s3Iteratee(etags)
  }

}

虽然Iteratee似乎工作，我能够按块处理文件块，但上传失败并出现奇怪的错误。这是日志

[debug] upload - >> [B@1df9048d
[debug] upload - >> [B@152dcf59
[debug] upload - >> [B@7cfeb0d8
[debug] upload - >> [B@136844c5
[debug] upload - >> [B@16f41590
[debug] upload - >> [B@6dd85710
[debug] upload - >> [B@64294203
[debug] upload - >> [B@35366c2f
[debug] upload - >> [B@358a78c
[debug] upload - >> [B@2c171020
[debug] upload - >> [B@20076fb
[debug] upload - >> [B@4d13580
[debug] upload - >> [B@42738651
[debug] upload - >> [B@5671082f
[debug] upload - >> [B@57c70bb4
[debug] upload - >> [B@4154394f
[debug] upload - >> [B@4f93cf15
[debug] upload - >> [B@4bac523f
[debug] upload - >> [B@eaec52e
[debug] upload - >> [B@6ed00bf5
[debug] upload - >> [B@3f6a8a5d
[debug] upload - >> [B@16fe1a25
[debug] upload - >> [B@6e813a61
[debug] upload - >> [B@e01be7
[debug] upload - >> [B@6bb351c4
[debug] upload - >> [B@dfa51a5
[debug] upload - >> [B@6acf2049
[debug] upload - >> [B@6a7021d4
[debug] upload - >> [B@1b3c602f
[debug] upload - >> [B@44146d94
[debug] upload - >> [B@574ac037
[debug] upload - >> [B@3cdf258b
[debug] upload - >> [B@441a0727
[debug] upload - >> [B@2385aafd
[debug] upload - >> [B@224f9dc2
[debug] upload - >> [B@6779077d
[debug] upload - >> [B@734e178a
[debug] upload - >> [B@7d92895c
[debug] upload - >> [B@23edaaa1
[debug] upload - >> [B@c00134e
[debug] upload - >> [B@ff1a703
[error] play - Cannot invoke the action, eventually got an error: Status Code: 400, AWS Service: Amazon S3, AWS Request ID: 98h72s0EBA7653AD, AWS Error Code: MalformedXML, AWS Error Message: The XML you provided was not well-formed or did not validate against our published schema, S3 Extended Request ID: R7e44g8oRy5b4xd7MU++atibwrBSRFezeMxNCXE38gyzcwci5Zf
[error] application - 

! @6k2maob49 - Internal server error, for (POST) [/v1/file_upload] ->

play.api.Application$$anon$1: Execution exception[[AmazonS3Exception: The XML you provided was not well-formed or did not validate against our published schema]]
        at play.api.Application$class.handleError(Application.scala:296) ~[play_2.10-2.3.2.jar:2.3.2]
        at play.api.DefaultApplication.handleError(Application.scala:402) [play_2.10-2.3.2.jar:2.3.2]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.10-2.3.2.jar:2.3.2]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.10-2.3.2.jar:2.3.2]
        at scala.Option.map(Option.scala:145) [scala-library.jar:na]
Caused by: com.amazonaws.services.s3.model.AmazonS3Exception: The XML you provided was not well-formed or did not validate against our published schema
        at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:556) ~[aws-java-sdk-1.3.11.jar:na]
        at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:289) ~[aws-java-sdk-1.3.11.jar:na]
        at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:170) ~[aws-java-sdk-1.3.11.jar:na]
        at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:2723) ~[aws-java-sdk-1.3.11.jar:na]
        at com.amazonaws.services.s3.AmazonS3Client.completeMultipartUpload(AmazonS3Client.java:1964) ~[aws-java-sdk-1.3.11.jar:na]