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package xyz.driver.core
package reporting
import java.security.Signature
import java.time.Instant
import java.util
import akka.NotUsed
import akka.stream.scaladsl.{Flow, RestartSink, Sink, Source, SourceQueueWithComplete}
import akka.stream.{Materializer, OverflowStrategy}
import com.google.auth.oauth2.ServiceAccountCredentials
import com.softwaremill.sttp._
import com.typesafe.scalalogging.Logger
import spray.json.DerivedJsonProtocol._
import spray.json._
import xyz.driver.core.reporting.Reporter.CausalRelation
import scala.async.Async._
import scala.concurrent.duration._
import scala.concurrent.{ExecutionContext, Future}
import scala.util.Random
import scala.util.control.NonFatal
/** A reporter that collects traces and submits them to
* [[https://cloud.google.com/trace/docs/reference/v2/rest/ Google's Stackdriver Trace API]].
*/
class GoogleReporter(
credentials: ServiceAccountCredentials,
namespace: String,
val logger: Logger,
buffer: Int = GoogleReporter.DefaultBufferSize,
interval: FiniteDuration = GoogleReporter.DefaultInterval)(
implicit client: SttpBackend[Future, _],
mat: Materializer,
ec: ExecutionContext
) extends Reporter with ScalaLoggerLike {
import GoogleReporter._
private val getToken: () => Future[String] = Refresh.every(55.minutes) {
def jwt = {
val now = Instant.now().getEpochSecond
val base64 = util.Base64.getEncoder
val header = base64.encodeToString("""{"alg":"RS256","typ":"JWT"}""".getBytes("utf-8"))
val body = base64.encodeToString(
s"""|{
| "iss": "${credentials.getClientEmail}",
| "scope": "https://www.googleapis.com/auth/trace.append",
| "aud": "https://www.googleapis.com/oauth2/v4/token",
| "exp": ${now + 60.minutes.toSeconds},
| "iat": $now
|}""".stripMargin.getBytes("utf-8")
)
val signer = Signature.getInstance("SHA256withRSA")
signer.initSign(credentials.getPrivateKey)
signer.update(s"$header.$body".getBytes("utf-8"))
val signature = base64.encodeToString(signer.sign())
s"$header.$body.$signature"
}
sttp
.post(uri"https://www.googleapis.com/oauth2/v4/token")
.body(
"grant_type" -> "urn:ietf:params:oauth:grant-type:jwt-bearer",
"assertion" -> jwt
)
.mapResponse(s => s.parseJson.asJsObject.fields("access_token").convertTo[String])
.send()
.map(_.unsafeBody)
}
private val sendToGoogle: Sink[Span, NotUsed] = RestartSink.withBackoff(
minBackoff = 3.seconds,
maxBackoff = 30.seconds,
randomFactor = 0.2 // adds 20% "noise" to vary the intervals slightly
) { () =>
Flow[Span]
.groupedWithin(buffer, interval)
.mapAsync(1) { spans =>
async {
val token = await(getToken())
val res = await(
sttp
.post(uri"https://cloudtrace.googleapis.com/v2/projects/${credentials.getProjectId}/traces:batchWrite")
.auth
.bearer(token)
.body(
Spans(spans).toJson.compactPrint
)
.send()
.map(_.unsafeBody))
res
}
}
.recover {
case NonFatal(e) =>
System.err.println(s"Error submitting trace spans: $e") // scalastyle: ignore
throw e
}
.to(Sink.ignore)
}
private val queue: SourceQueueWithComplete[Span] = Source
.queue[Span](buffer, OverflowStrategy.dropHead)
.to(sendToGoogle)
.run()
private def submit(span: Span): Unit = queue.offer(span).failed.map { e =>
System.err.println(s"Error adding span to submission queue: $e")
}
private def startSpan(
traceId: String,
spanId: String,
parentSpanId: Option[String],
displayName: String,
attributes: Map[String, String]) = Span(
s"projects/${credentials.getProjectId}/traces/$traceId/spans/$spanId",
spanId,
parentSpanId,
TruncatableString(displayName),
Instant.now(),
Instant.now(),
Attributes(attributes ++ Map("namespace" -> namespace))
)
def traceWithOptionalParent[A](
operationName: String,
tags: Map[String, String],
parent: Option[(SpanContext, CausalRelation)])(operation: SpanContext => A): A = {
val child = parent match {
case Some((p, _)) => SpanContext(p.traceId, f"${Random.nextLong()}%016x")
case None => SpanContext.fresh()
}
val span = startSpan(child.traceId, child.spanId, parent.map(_._1.spanId), operationName, tags)
val result = operation(child)
span.endTime = Instant.now()
submit(span)
result
}
def traceWithOptionalParentAsync[A](
operationName: String,
tags: Map[String, String],
parent: Option[(SpanContext, CausalRelation)])(operation: SpanContext => Future[A]): Future[A] = {
val child = parent match {
case Some((p, _)) => SpanContext(p.traceId, f"${Random.nextLong()}%016x")
case None => SpanContext.fresh()
}
val span = startSpan(child.traceId, child.spanId, parent.map(_._1.spanId), operationName, tags)
val result = operation(child)
result.onComplete { _ =>
span.endTime = Instant.now()
submit(span)
}
result
}
}
object GoogleReporter {
val DefaultBufferSize: Int = 10000
val DefaultInterval: FiniteDuration = 5.seconds
private case class Attributes(attributeMap: Map[String, String])
private case class TruncatableString(value: String)
private case class Span(
name: String,
spanId: String,
parentSpanId: Option[String],
displayName: TruncatableString,
startTime: Instant,
var endTime: Instant,
attributes: Attributes
)
private case class Spans(spans: Seq[Span])
private implicit val instantFormat: RootJsonFormat[Instant] = new RootJsonFormat[Instant] {
override def write(obj: Instant): JsValue = obj.toString.toJson
override def read(json: JsValue): Instant = Instant.parse(json.convertTo[String])
}
private implicit val mapFormat = new RootJsonFormat[Map[String, String]] {
override def read(json: JsValue): Map[String, String] = sys.error("unimplemented")
override def write(obj: Map[String, String]): JsValue = {
val withValueObjects = obj.mapValues(value => JsObject("stringValue" -> JsObject("value" -> value.toJson)))
JsObject(withValueObjects)
}
}
private implicit val attributeFormat: RootJsonFormat[Attributes] = jsonFormat1(Attributes)
private implicit val truncatableStringFormat: RootJsonFormat[TruncatableString] = jsonFormat1(TruncatableString)
private implicit val spanFormat: RootJsonFormat[Span] = jsonFormat7(Span)
private implicit val spansFormat: RootJsonFormat[Spans] = jsonFormat1(Spans)
}
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