CODEWITHSUNDEEP
scalahttphttprequestspray
tigga4392
tigga4392

Reputation: 111

Retrieving http response using spray and futures with timeout

I am trying figure out the best way to retrieve the contents from a GET http request with using a timeout. I spent a good amount of time trying to figure out the best approach, but I am a little unsure.

Basically I just want to have an option that will return None if the response does not come before the timeout, otherwise return the contents.

Thanks

Upvotes: 2

Views: 90

Answers (2)

Carlos Vilchez
Carlos Vilchez

Reputation: 2804

So I suppose you are trying to solve 2 problems. How to define a particular timeout in the configuration and then how to manage timeouts when they happen.

  • Define http client timeouts: You will need to update your application.conf to overwrite the default configuration of the http client. e.g.:

    spray.can {
  client {
    request-timeout = 20s
  }
}

  • Managing timeouts: When you use the spray client, you will use a pipeline that will run the requests. It will be a function that looks something like (HttpRequest) => Future[ObjectResponse]. The result will be a Future of an object you have defined ,ObjectResponse in my example, you can resolve the future. In case a there is a timeout, the Future will become a RequestTimeoutException. Then you will be able to process the timeout exception with a recover. So your code will look something like this:

    def sendRequestFunction(...): Future[ObjectResponse] = {...}

sendRequestFunction(parameters) map (Option) // In case we get an object, we will have a Some(obj)
recover {
   case e: RequestTimeoutException => None
}

Upvotes: 1

sheff_master
sheff_master

Reputation: 19

You can try something like this:

timedOutFuture = after(duration = duration, using = system.scheduler) {
   Future.successfull(None)
 }

Future.firstCompletedOf(Seq(youHttpRequestFuture, timedOutFuture))

Hope it helps

Upvotes: 0

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