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package spray.can.server
import org.aspectj.lang.annotation.{After, Pointcut, DeclareMixin, Aspect}
import kamon.trace.{Trace, ContextAware}
import spray.http.HttpRequest
import akka.actor.ActorSystem
import akka.event.Logging.Warning
@Aspect
class ServerRequestTracing {
@DeclareMixin("spray.can.server.OpenRequestComponent.DefaultOpenRequest")
def mixinContextAwareToOpenRequest: ContextAware = ContextAware.default
@Pointcut("execution(spray.can.server.OpenRequestComponent$DefaultOpenRequest.new(..)) && this(openRequest) && args(*, request, *, *)")
def openRequestInit(openRequest: ContextAware, request: HttpRequest): Unit = {}
@After("openRequestInit(openRequest, request)")
def afterInit(openRequest: ContextAware, request: HttpRequest): Unit = {
val system: ActorSystem = openRequest.asInstanceOf[OpenRequest].context.actorContext.system
val defaultTraceName: String = request.method.value + ": " + request.uri.path
Trace.start(defaultTraceName)(system)
// Necessary to force initialization of traceContext when initiating the request.
openRequest.traceContext
}
@Pointcut("execution(* spray.can.server.OpenRequestComponent$DefaultOpenRequest.handleResponseEndAndReturnNextOpenRequest(..)) && target(openRequest)")
def openRequestCreation(openRequest: ContextAware): Unit = {}
@After("openRequestCreation(openRequest)")
def afterFinishingRequest(openRequest: ContextAware): Unit = {
val storedContext = openRequest.traceContext
val incomingContext = Trace.finish()
for(original <- storedContext) {
incomingContext match {
case Some(incoming) if original.id != incoming.id =>
publishWarning(s"Different ids when trying to close a Trace, original: [$original] - incoming: [$incoming]")
case Some(_) => // nothing to do here.
case None =>
original.finish
publishWarning(s"Trace context not present while closing the Trace: [$original]")
}
}
def publishWarning(text: String): Unit = {
val system: ActorSystem = openRequest.asInstanceOf[OpenRequest].context.actorContext.system
system.eventStream.publish(Warning("", classOf[ServerRequestTracing], text))
}
}
}
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