Use netty HttpServer in DcaeAppApiServer

[dcaegen2/collectors/hv-ves.git] / sources / hv-collector-utils / src / main / kotlin / org / onap / dcae / collectors / veshv / utils / http / netty.kt

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
new file mode 100644 (file)
index 0000000..33e65e4
--- /dev/null
+++ b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/http/netty.kt
@@ -0,0 +1,69 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2019 NOKIA
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.veshv.utils.http
+
+import arrow.effects.IO
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import reactor.core.publisher.Mono
+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.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)
+                }
+        )
+
+private 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() }))
+}
+
+private fun errorResponse(message: String?): Response =
+        Response(
+                HttpStatus.INTERNAL_SERVER_ERROR,
+                Content(
+                        ContentType.JSON,
+                        Json.createObjectBuilder().add("error", message).build()
+                )
+        )