How to get incoming IP address in Spray framework

Question

I am looking at headers that are coming in, but no IP seems to be there:

HttpRequest(GET,http://127.0.0.1:8080/track/check,List(Accept-Language: uk-UA, 
uk, ru, en-US, en, Encoding: gzip, deflate, sdch, User-Agent: Mozilla/5.0 
(Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29
Safari/537.36, Accept: text/html, application/xhtml+xml, application/xml;q=0.9, 
*/*;q=0.8, Connection: keep-alive, Host: 127.0.0.1:8080),EmptyEntity,HTTP/1.1)

This is a request I did from browser. Basically I am looking in:

path("check") {
       get {
         implicit request => {
           val a = 5
         }
       }
     } ~

Here request object doesn't have any information about the IP address. Any help is very appreciated. thanks.

Answer 1

The problem was in configuration, this is not documented well. Adding this:

# spray-can config
spray.can {
  server {
    remote-address-header = on
  }
}

forces spray to add remote IP header to the main headers. Address header will have name Remote-Address.

Answer 2

If you are using spray routing, then there is a directive for extracting client ip called clientIP =) To use it just write:

(path("somepath") & get) {
  clientIP { ip =>
    complete(s"ip is $ip")
  }
}

more then simple, but you need still need to add explicit configuration to get IP from request. And a little comment, maybe i didn't get something but in spray there is no implicit request. Actually incoming request percolates through your routing structure, if you take a look into the routing library you'll see that route is just an alias: type Route = RequestContext => Unit. So if you need to get access to the context at some point just write:

(path("somepath") & get) {
  clientIP { ip => 
    reqCont => reqCont.complete(s"ip is $ip")
  }
}

But remember about static route part and dynamic part.