Implemented rest server in client simulator

[dcaegen2/collectors/hv-ves.git] / hv-collector-client-simulator / src / main / kotlin / org / onap / dcae / collectors / veshv / simulators / xnf / impl / HttpServer.kt

diff --git a/hv-collector-client-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/xnf/impl/HttpServer.kt b/hv-collector-client-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/xnf/impl/HttpServer.kt
new file mode 100644 (file)
index 0000000..bc1cff7
--- /dev/null
+++ b/hv-collector-client-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/xnf/impl/HttpServer.kt
@@ -0,0 +1,96 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018 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.simulators.xnf.impl
+
+import org.onap.dcae.collectors.veshv.simulators.xnf.config.MessageParameters
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import ratpack.handling.Chain
+import ratpack.handling.Context
+import ratpack.server.RatpackServer
+import ratpack.server.ServerConfig
+import reactor.core.publisher.Mono
+import javax.json.Json
+import javax.json.JsonObject
+
+/**
+ * @author Jakub Dudycz <jakub.dudycz@nokia.com>
+ * @since June 2018
+ */
+class HttpServer(private val vesClient: VesHvClient) {
+
+    fun start(port: Int = DEFAULT_PORT): Mono<RatpackServer> = Mono.fromCallable {
+        RatpackServer.of {
+            it.serverConfig(ServerConfig.embedded().port(port)).handlers(this::configureHandlers)
+        }
+    }.doOnNext { it.start() }
+
+
+    private fun configureHandlers(chain: Chain) {
+        chain.post("simulator") { ctx ->
+            ctx.request.body
+                    .map { Json.createReader(it.inputStream).readObject() }
+                    .map { extractMessageParameters(it) }
+                    .map { MessageFactory.createMessageFlux(it) }
+                    .onError { handleException(it, ctx) }
+                    .then {
+                        vesClient.send(it)
+                        ctx.response
+                                .status(STATUS_OK)
+                                .send(CONTENT_TYPE_APPLICATION_JSON, Json.createObjectBuilder()
+                                        .add("response", "Request accepted")
+                                        .build()
+                                        .toString())
+                    }
+        }
+    }
+
+    private fun handleException(t: Throwable, ctx: Context) {
+        logger.warn("Failed to process the request - ${t.localizedMessage}")
+        logger.debug("Exception thrown when processing the request", t)
+        ctx.response
+                .status(STATUS_BAD_REQUEST)
+                .send(CONTENT_TYPE_APPLICATION_JSON, Json.createObjectBuilder()
+                        .add("response", "Request was not accepted")
+                        .add("exception", t.localizedMessage)
+                        .build()
+                        .toString())
+    }
+
+    private fun extractMessageParameters(request: JsonObject): MessageParameters =
+            try {
+                val commonEventHeader = MessageFactory
+                        .parseCommonHeader(request.getJsonObject("commonEventHeader"))
+                val messagesAmount = request.getJsonNumber("messagesAmount").longValue()
+                MessageParameters(commonEventHeader, messagesAmount)
+            } catch (e: Exception) {
+                throw ValidationException("Validating request body failed", e)
+            }
+
+
+    companion object {
+        private val logger = Logger(HttpServer::class)
+        const val DEFAULT_PORT = 5000
+        const val STATUS_OK = 200
+        const val STATUS_BAD_REQUEST = 400
+        const val CONTENT_TYPE_APPLICATION_JSON = "application/json"
+    }
+}
+
+internal class ValidationException(message: String?, cause: Exception) : Exception(message, cause)