Remove IO monad usage from simulators

Change-Id: I1c470777b91230f4a44a4960ca534e4b20c1ac43
Issue-ID: DCAEGEN2-1372
Signed-off-by: Izabela Zawadzka <izabela.zawadzka@nokia.com>

1 files changed, 29 insertions, 26 deletions

diff --git a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/netty.kt b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/netty.kt
index cf338a70..f133d630 100644
--- a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/netty.kt
+++ b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/netty.kt
@@ -20,50 +20,53 @@
 package org.onap.dcae.collectors.veshv.utils.http
 
 import arrow.core.Either
-import arrow.effects.IO
 import org.onap.dcae.collectors.veshv.utils.logging.Logger
 import reactor.core.publisher.Mono
+import reactor.core.publisher.toMono
 import reactor.netty.NettyOutbound
 import reactor.netty.http.server.HttpServerResponse
 import javax.json.Json
 
 private val logger = Logger("org.onap.dcae.collectors.veshv.utils.http.netty")
 
-fun HttpServerResponse.sendOrError(action: IO<Unit>): NettyOutbound =
-        sendAndHandleErrors(action.map {
-            Response(
-                    HttpStatus.OK,
-                    Content(
-                            ContentType.JSON,
-                            Json.createObjectBuilder().add("response", "Request accepted").build()
+fun HttpServerResponse.sendOrError(action: ()->Unit) = sendAndHandleErrors(
+        Mono
+                .fromSupplier(action)
+                .map {
+                    Response(
+                            HttpStatus.OK,
+                            Content(
+                                    ContentType.JSON,
+                                    Json.createObjectBuilder().add("response", "Request accepted").build()
+                            )
                     )
-            )
-        })
-
+                }
+)
 
-fun HttpServerResponse.sendAndHandleErrors(response: IO<Response>): NettyOutbound =
-        response.attempt().unsafeRunSync().fold(
-                { err ->
-                    logger.withWarn { log("Error occurred. Sending .", err) }
-                    val message = err.message
-                    sendResponse(errorResponse(message))
-                },
-                {
-                    sendResponse(it)
+fun HttpServerResponse.sendAndHandleErrors(response: Mono<Response>) =
+        response
+                .onErrorResume {
+                    logger.withWarn { log("Error occurred. Sending .", it) }
+                    errorResponse(it.localizedMessage).toMono()
+                }
+                .flatMap {
+                    sendResponse(it).then()
                 }
-        )
 
-fun <A> HttpServerResponse.sendEitherErrorOrResponse(response: Either<A, Response>): NettyOutbound =
+fun <A> HttpServerResponse.sendEitherErrorOrResponse(response: Either<A, Response>) =
         when (response) {
-            is Either.Left -> sendResponse(errorResponse(response.a.toString()))
-            is Either.Right -> sendAndHandleErrors(IO.just(response.b))
+            is Either.Left -> sendResponse(errorResponse(response.a.toString())).then()
+            is Either.Right -> sendAndHandleErrors(Mono.just(response.b))
         }
 
-private fun HttpServerResponse.sendResponse(response: Response): NettyOutbound {
+
+fun HttpServerResponse.sendResponse(response: Response): NettyOutbound {
     val respWithStatus = status(response.status.number)
     val responseContent = response.content
 
-    return respWithStatus.sendString(Mono.just(responseContent.serializer.run { responseContent.value.show() }))
+    return respWithStatus.sendString(
+            Mono.just(responseContent.serializer.run { responseContent.value.show() })
+    )
 }
 
 private fun errorResponse(message: String?): Response =