Question

Akka HTTP客户端请求返回Future [HttpResponse] - 应该如何处理Future失败？只记录错误或将其重新抛给主管？

是否存在可由客户端抛出的错误类型的文档（因此会自动传播到主管）以及可能导致Furure失败的错误。

Answer 1

这主要是品味问题。我通常会将Future[HttpResponse]转换为Future[Try[HttpResponse]]，然后将其作为

处理

response.flatMap { tryResp =>

  tryResp match {
    case Success(res) =>
      res.status match {
        case OK =>
          // Unmarshal response here into Future[Something]
        case Found =>
          // Handle  redirect by calling requestBlhBlah() again with anotehr URI
        case _ =>
          // I got status code I didn't expect so I wrap it along with body into Future failure
          Unmarshal(res.entity).to[String].flatMap { body =>
            Future.failed(new IOException(s"The response status is ${res.status} [${request.uri}] and response body is $body"))
          }
      }
    case Failure(ex) =>
      Future.failed(ex)
  }
}

如果您使用的是基于流的客户端，您还可以指定Decider来处理错误

val decider: Decider = {
  case ex =>
    ex.printStackTrace()
    Supervision.Stop // Passes error down to subscriber
}

然后在材质化器中使用它

implicit val materializer = ActorMaterializer(ActorMaterializerSettings(system).withSupervisionStrategy(decider))(system)

或通过.withAttributes(ActorAttributes.supervisionStrategy(decider))

以每个流量为基础

根据Future失败，由您决定如何处理它。您可以使用recoverWith将失败转换为其他内容，或将其记录在Future.onFailure。

如何处理Akka HTTP客户端响应失败

1 个答案: