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package xyz.driver.tracing
import java.util.UUID
import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers._
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server._
import scala.collection.immutable.Seq
trait TracingDirectives {
import TracingDirectives._
def extractTraceHeaders: Directive1[Seq[HttpHeader]] =
extractRequest.map { request =>
request.headers.filter(h =>
h.name == TraceHeaderName || h.name == SpanHeaderName)
}
def trace(tracer: Tracer,
name: Option[String] = None,
extraLabels: Map[String, String] = Map.empty): Directive0 =
extractRequest.flatMap { request =>
def getHeader(name: String): Option[String] =
request.headers.find(_.name == name).map(_.value)
// get existing trace or start a new one
val traceId = getHeader(TraceHeaderName)
.map(UUID.fromString)
.getOrElse(UUID.randomUUID())
val parentSpanId = getHeader(SpanHeaderName).map(UUID.fromString)
val labels = Map(
"/http/user_agent" -> "driver-tracer",
"/http/method" -> request.method.name,
"/http/url" -> request.uri.path.toString,
"/http/host" -> request.uri.authority.host.toString
) ++ extraLabels
val span = Span(
name = name.getOrElse(request.uri.path.toString),
traceId = traceId,
parentSpanId = parentSpanId,
labels = labels
)
val childHeaders = Seq(
RawHeader(TraceHeaderName, span.traceId.toString),
RawHeader(SpanHeaderName, span.spanId.toString)
)
mapRequest(childRequest =>
childRequest
.withHeaders(childRequest.headers
.filterNot(h =>
h.name() == TraceHeaderName ||
h.name() == SpanHeaderName) ++ childHeaders)) & mapRouteResult {
result =>
tracer.submit(span.end())
result
}
}
}
object TracingDirectives extends TracingDirectives {
val TraceHeaderName = "Tracing-Trace-Id"
val SpanHeaderName = "Tracing-Span-Id"
}
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