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/*
* ============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 arrow.effects.IO
import org.onap.dcae.collectors.veshv.domain.PayloadWireFrameMessage
import org.onap.dcae.collectors.veshv.simulators.xnf.config.MessageParameters
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import ratpack.exec.Promise
import ratpack.handling.Chain
import ratpack.handling.Context
import ratpack.server.RatpackServer
import ratpack.server.ServerConfig
import reactor.core.publisher.Flux
import reactor.core.scheduler.Schedulers
import javax.json.Json
import javax.json.JsonObject
/**
* @author Jakub Dudycz <jakub.dudycz@nokia.com>
* @since June 2018
*/
internal class HttpServer(private val vesClient: XnfSimulator) {
fun start(port: Int = DEFAULT_PORT): IO<RatpackServer> = IO {
RatpackServer.start { server ->
server.serverConfig(ServerConfig.embedded().port(port))
.handlers(this::configureHandlers)
}
}
private fun configureHandlers(chain: Chain) {
chain
.post("simulator/sync") { ctx ->
createMessageFlux(ctx)
.map { vesClient.sendIo(it) }
.map { it.unsafeRunSync() }
.onError { handleException(it, ctx) }
.then { sendAcceptedResponse(ctx) }
}
.post("simulator/async") { ctx ->
createMessageFlux(ctx)
.map { vesClient.sendRx(it) }
.map { it.subscribeOn(Schedulers.elastic()).subscribe() }
.onError { handleException(it, ctx) }
.then { sendAcceptedResponse(ctx) }
}
}
private fun createMessageFlux(ctx: Context): Promise<Flux<PayloadWireFrameMessage>> {
return ctx.request.body
.map { Json.createReader(it.inputStream).readObject() }
.map { extractMessageParameters(it) }
.map { MessageGeneratorImpl.INSTANCE.createMessageFlux(it) }
}
private fun sendAcceptedResponse(ctx: Context) {
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 = MessageGeneratorImpl.INSTANCE
.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)
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