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/* ===================================================
* Copyright © 2013 the kamon project <http://kamon.io/>
*
* 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 kamon.spray
import spray.routing.directives.BasicDirectives
import spray.routing._
import java.util.concurrent.atomic.AtomicLong
import scala.util.Try
import java.net.InetAddress
import kamon.trace.Trace
import spray.http.HttpHeaders.RawHeader
trait UowDirectives extends BasicDirectives {
def uow: Directive0 = mapRequest { request ⇒
val uowHeader = request.headers.find(_.name == "X-UOW")
val generatedUow = uowHeader.map(_.value).getOrElse(UowDirectives.newUow)
Trace.transformContext(_.copy(uow = generatedUow))
request
}
def respondWithUow = mapHttpResponseHeaders(headers ⇒ Trace.context().map(ctx ⇒ RawHeader("X-UOW", ctx.uow) :: headers).getOrElse(headers))
}
object UowDirectives {
val uowCounter = new AtomicLong
val hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
def newUow = "%s-%s".format(hostnamePrefix, uowCounter.incrementAndGet())
}
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