1 files changed, 89 insertions, 0 deletions
diff --git a/jvm/src/main/scala/xyz/driver/core/rest/HttpRestServiceTransport.scala b/jvm/src/main/scala/xyz/driver/core/rest/HttpRestServiceTransport.scala
new file mode 100644
index 0000000..788729a
--- /dev/null
+++ b/jvm/src/main/scala/xyz/driver/core/rest/HttpRestServiceTransport.scala
@@ -0,0 +1,89 @@
+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 com.typesafe.scalalogging.Logger
+import org.slf4j.MDC
+import xyz.driver.core.Name
+import xyz.driver.core.rest.errors.{ExternalServiceException, ExternalServiceTimeoutException}
+import xyz.driver.core.time.provider.TimeProvider
+
+import scala.concurrent.{ExecutionContext, Future}
+import scala.util.{Failure, Success}
+
+class HttpRestServiceTransport(
+    applicationName: Name[App],
+    applicationVersion: String,
+    actorSystem: ActorSystem,
+    executionContext: ExecutionContext,
+    log: Logger,
+    time: TimeProvider)
+    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 requestTime = time.currentTime()
+
+    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)
+      }: _*)
+
+    log.debug(s"Sending request to ${request.method} ${request.uri}")
+
+    val response = httpClient.makeRequest(request)
+
+    response.onComplete {
+      case Success(r) =>
+        val responseLatency = requestTime.durationTo(time.currentTime())
+        log.debug(s"Response from ${request.uri} to request $requestStub is successful in $responseLatency ms: $r")
+
+      case Failure(t: Throwable) =>
+        val responseLatency = requestTime.durationTo(time.currentTime())
+        log.warn(s"Failed to receive response from ${request.method} ${request.uri} in $responseLatency ms", t)
+    }(executionContext)
+
+    response.recoverWith {
+      case _: TcpIdleTimeoutException =>
+        val serviceCalled = s"${requestStub.method} ${requestStub.uri}"
+        Future.failed(ExternalServiceTimeoutException(serviceCalled))
+      case t: Throwable => Future.failed(t)
+    }
+  }
+
+  def sendRequest(context: ServiceRequestContext)(requestStub: HttpRequest)(
+      implicit mat: Materializer): Future[Unmarshal[ResponseEntity]] = {
+
+    sendRequestGetResponse(context)(requestStub) flatMap { response =>
+      if (response.status == StatusCodes.NotFound) {
+        Future.successful(Unmarshal(HttpEntity.Empty: ResponseEntity))
+      } else if (response.status.isFailure()) {
+        val serviceCalled = s"${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))
+      }
+    }
+  }
+}