server: Add LoggingFilter

server/app/com/xsn/explorer/play/LoggingFilter.scala

@@ -0,0 +1,33 @@
+package com.xsn.explorer.play
+
+import javax.inject.Inject
+
+import akka.stream.Materializer
+import org.slf4j.LoggerFactory
+import play.api.mvc.{Filter, RequestHeader, Result}
+
+import scala.concurrent.{ExecutionContext, Future}
+
+class LoggingFilter @Inject() (
+    implicit val mat: Materializer,
+    ec: ExecutionContext)
+    extends Filter {
+
+  private val logger = LoggerFactory.getLogger(this.getClass)
+
+  def apply(nextFilter: RequestHeader => Future[Result])
+      (requestHeader: RequestHeader): Future[Result] = {
+
+    val startTime = System.currentTimeMillis
+
+    nextFilter(requestHeader).map { result =>
+
+      val endTime = System.currentTimeMillis
+      val requestTime = endTime - startTime
+
+      logger.info(s"${requestHeader.method} ${requestHeader.uri} took $requestTime ms and returned ${result.header.status}")
+
+      result.withHeaders("Request-Time" -> requestTime.toString)
+    }
+  }
+}

server/conf/application.conf

@@ -13,6 +13,8 @@ play.http {
   secret.key=${?PLAY_APPLICATION_SECRET}
 }
 
+play.filters.enabled += "com.xsn.explorer.play.LoggingFilter"
+
 rpc {
   host = "http://localhost:51473"
   username = "dummy"