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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2019 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.main
import org.onap.dcae.collectors.veshv.config.api.ConfigurationModule
import org.onap.dcae.collectors.veshv.config.api.model.HvVesConfiguration
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
import org.onap.dcae.collectors.veshv.main.servers.HealthCheckServer
import org.onap.dcae.collectors.veshv.main.servers.VesServer
import org.onap.dcae.collectors.veshv.model.ServiceContext
import org.onap.dcae.collectors.veshv.utils.ServerHandle
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.dcae.collectors.veshv.utils.neverComplete
import org.onap.dcae.collectors.veshv.utils.registerShutdownHook
import reactor.core.scheduler.Schedulers
import java.util.concurrent.atomic.AtomicReference
private const val VES_HV_PACKAGE = "org.onap.dcae.collectors.veshv"
private val logger = Logger("$VES_HV_PACKAGE.main")
private val hvVesServer = AtomicReference<ServerHandle>()
private val configurationModule = ConfigurationModule()
fun main(args: Array<String>) {
HealthCheckServer.start(configurationModule.healthCheckPort(args))
configurationModule
.hvVesConfigurationUpdates(args)
.publishOn(Schedulers.single(Schedulers.elastic()))
.doOnNext(::startServer)
.doOnError(::logServerStartFailed)
.neverComplete() // TODO: remove after merging configuration stream with cbs
.block()
}
private fun startServer(config: HvVesConfiguration) {
stopRunningServer()
Logger.setLogLevel(VES_HV_PACKAGE, config.logLevel)
logger.info { "Using configuration: $config" }
VesServer.start(config).let {
registerShutdownHook { shutdownGracefully(it) }
hvVesServer.set(it)
}
}
private fun stopRunningServer() = hvVesServer.get()?.close()?.unsafeRunSync()
internal fun shutdownGracefully(serverHandle: ServerHandle,
healthState: HealthState = HealthState.INSTANCE) {
logger.debug(ServiceContext::mdc) { "Graceful shutdown started" }
healthState.changeState(HealthDescription.SHUTTING_DOWN)
serverHandle.close().unsafeRunSync()
logger.info(ServiceContext::mdc) { "Graceful shutdown completed" }
}
private fun logServerStartFailed(ex: Throwable) =
logger.withError(ServiceContext::mdc) { log("Failed to start a server", ex) }
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