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package kamon.instrumentation
import org.aspectj.lang.annotation._
import kamon.{TraceContext, Tracer}
import kamon.trace.UowTracing._
import kamon.trace.context.TracingAwareContext
import org.aspectj.lang.ProceedingJoinPoint
import spray.http.HttpRequest
import kamon.trace.UowTracing.Finish
import kamon.trace.UowTracing.Rename
import spray.http.HttpHeaders.Host
//import spray.can.client.HttpHostConnector.RequestContext
trait ContextAware {
def traceContext: Option[TraceContext]
}
trait TimedContextAware {
def timestamp: Long
def traceContext: Option[TraceContext]
}
@Aspect
class SprayOpenRequestContextTracing {
@DeclareMixin("spray.can.server.OpenRequestComponent.DefaultOpenRequest")
def mixinContextAwareToOpenRequest: ContextAware = new ContextAware {
val traceContext: Option[TraceContext] = Tracer.traceContext.value
}
@DeclareMixin("spray.can.client.HttpHostConnector.RequestContext")
def mixinContextAwareToRequestContext: TimedContextAware = new TimedContextAware {
val timestamp: Long = System.nanoTime()
val traceContext: Option[TraceContext] = Tracer.traceContext.value
}
}
@Aspect
class SprayServerInstrumentation {
@Pointcut("execution(spray.can.server.OpenRequestComponent$DefaultOpenRequest.new(..)) && this(openRequest) && args(*, request, *, *)")
def openRequestInit(openRequest: ContextAware, request: HttpRequest): Unit = {}
@After("openRequestInit(openRequest, request)")
def afterInit(openRequest: ContextAware, request: HttpRequest): Unit = {
Tracer.start
openRequest.traceContext
Tracer.context().map(_.tracer ! Rename(request.uri.path.toString()))
}
@Pointcut("execution(* spray.can.server.OpenRequestComponent$DefaultOpenRequest.handleResponseEndAndReturnNextOpenRequest(..)) && target(openRequest)")
def openRequestCreation(openRequest: ContextAware): Unit = {}
@After("openRequestCreation(openRequest)")
def afterFinishingRequest(openRequest: ContextAware): Unit = {
val original = openRequest.traceContext
Tracer.context().map(_.tracer ! Finish())
if(Tracer.context() != original) {
println(s"OMG DIFFERENT Original: [${original}] - Came in: [${Tracer.context}]")
}
}
@Pointcut("execution(spray.can.client.HttpHostConnector.RequestContext.new(..)) && this(ctx) && args(request, *, *)")
def requestRecordInit(ctx: TimedContextAware, request: HttpRequest): Unit = {}
@After("requestRecordInit(ctx, request)")
def whenCreatedRequestRecord(ctx: TimedContextAware, request: HttpRequest): Unit = {
// Necessary to force the initialization of TracingAwareRequestContext at the moment of creation.
for{
tctx <- ctx.traceContext
host <- request.header[Host]
} tctx.tracer ! WebExternalStart(ctx.timestamp, host.host)
}
@Pointcut("execution(* spray.can.client.HttpHostConnectionSlot.dispatchToCommander(..)) && args(requestContext, message)")
def dispatchToCommander(requestContext: TimedContextAware, message: Any): Unit = {}
@Around("dispatchToCommander(requestContext, message)")
def aroundDispatchToCommander(pjp: ProceedingJoinPoint, requestContext: TimedContextAware, message: Any) = {
println("Completing the request with context: " + requestContext.traceContext)
Tracer.traceContext.withValue(requestContext.traceContext) {
requestContext.traceContext.map {
tctx => tctx.tracer ! WebExternalFinish(requestContext.timestamp)
}
pjp.proceed()
}
}
@Pointcut("execution(* spray.can.client.HttpHostConnector.RequestContext.copy(..)) && this(old)")
def copyingRequestContext(old: TimedContextAware): Unit = {}
@Around("copyingRequestContext(old)")
def aroundCopyingRequestContext(pjp: ProceedingJoinPoint, old: TimedContextAware) = {
println("Instrumenting the request context copy.")
Tracer.traceContext.withValue(old.traceContext) {
pjp.proceed()
}
}
}
case class DefaultTracingAwareRequestContext(traceContext: Option[TraceContext] = Tracer.context(), timestamp: Long = System.nanoTime) extends TracingAwareContext
@Aspect
class SprayRequestContextTracing {
@DeclareMixin("spray.can.client.HttpHostConnector.RequestContext")
def mixin: TracingAwareContext = DefaultTracingAwareRequestContext()
}
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