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package xyz.driver.core.rest
import akka.actor.ActorSystem
import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers.RawHeader
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.Materializer
import akka.stream.scaladsl.TcpIdleTimeoutException
import org.slf4j.MDC
import xyz.driver.core.Name
import xyz.driver.core.reporting.Reporter
import xyz.driver.core.rest.errors.{ExternalServiceException, ExternalServiceTimeoutException}
import scala.concurrent.{ExecutionContext, Future}
import scala.util.{Failure, Success}
class HttpRestServiceTransport(
applicationName: Name[App],
applicationVersion: String,
actorSystem: ActorSystem,
executionContext: ExecutionContext,
reporter: Reporter)
extends ServiceTransport {
protected implicit val execution: ExecutionContext = executionContext
protected val httpClient: HttpClient = new SingleRequestHttpClient(applicationName, applicationVersion, actorSystem)
def sendRequestGetResponse(context: ServiceRequestContext)(requestStub: HttpRequest): Future[HttpResponse] = {
val tags = Map(
// open tracing semantic tags
"span.kind" -> "client",
"service" -> applicationName.value,
"http.url" -> requestStub.uri.toString,
"http.method" -> requestStub.method.value,
"peer.hostname" -> requestStub.uri.authority.host.toString,
// google's tracing console provides extra search features if we define these tags
"/http/path" -> requestStub.uri.path.toString,
"/http/method" -> requestStub.method.value.toString,
"/http/url" -> requestStub.uri.toString
)
reporter.traceAsync(s"http_call_rpc", tags) { implicit span =>
val requestTime = System.currentTimeMillis()
val request = requestStub
.withHeaders(context.contextHeaders.toSeq.map {
case (ContextHeaders.TrackingIdHeader, _) =>
RawHeader(ContextHeaders.TrackingIdHeader, context.trackingId)
case (ContextHeaders.StacktraceHeader, _) =>
RawHeader(
ContextHeaders.StacktraceHeader,
Option(MDC.get("stack"))
.orElse(context.contextHeaders.get(ContextHeaders.StacktraceHeader))
.getOrElse(""))
case (header, headerValue) => RawHeader(header, headerValue)
}: _*)
reporter.debug(s"Sending request to ${request.method} ${request.uri}")
val response = httpClient.makeRequest(request)
response.onComplete {
case Success(r) =>
val responseLatency = System.currentTimeMillis() - requestTime
reporter.debug(
s"Response from ${request.uri} to request $requestStub is successful in $responseLatency ms: $r")
case Failure(t: Throwable) =>
val responseLatency = System.currentTimeMillis() - requestTime
reporter.warn(
s"Failed to receive response from ${request.method.value} ${request.uri} in $responseLatency ms",
t)
}(executionContext)
response.recoverWith {
case _: TcpIdleTimeoutException =>
val serviceCalled = s"${requestStub.method.value} ${requestStub.uri}"
Future.failed(ExternalServiceTimeoutException(serviceCalled))
case t: Throwable => Future.failed(t)
}
}(context.spanContext)
}
def sendRequest(context: ServiceRequestContext)(requestStub: HttpRequest)(
implicit mat: Materializer): Future[Unmarshal[ResponseEntity]] = {
sendRequestGetResponse(context)(requestStub) flatMap { response =>
if (response.status == StatusCodes.NotFound) {
Future.successful(Unmarshal(HttpEntity.Empty: ResponseEntity))
} else if (response.status.isFailure()) {
val serviceCalled = s"${requestStub.method} ${requestStub.uri}"
Unmarshal(response.entity).to[String] flatMap { errorString =>
import spray.json._
import xyz.driver.core.json._
val serviceException = util.Try(serviceExceptionFormat.read(errorString.parseJson)).toOption
Future.failed(ExternalServiceException(serviceCalled, errorString, serviceException))
}
} else {
Future.successful(Unmarshal(response.entity))
}
}
}
}
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