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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.healthcheck.factory
import io.netty.handler.codec.http.HttpResponseStatus
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
import org.onap.dcae.collectors.veshv.healthcheck.ports.PrometheusMetricsProvider
import org.onap.dcae.collectors.veshv.utils.NettyServerHandle
import org.onap.dcae.collectors.veshv.utils.ServerHandle
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import reactor.netty.http.server.HttpServer
import reactor.netty.http.server.HttpServerRequest
import reactor.netty.http.server.HttpServerResponse
import java.net.SocketAddress
import java.util.concurrent.atomic.AtomicReference
/**
* @author Jakub Dudycz <jakub.dudycz@nokia.com>
* @since August 2018
*/
class HealthCheckApiServer(private val healthState: HealthState,
private val monitoring: PrometheusMetricsProvider,
private val listenAddress: SocketAddress) {
private val healthDescription: AtomicReference<HealthDescription> = AtomicReference(HealthDescription.STARTING)
fun start(): Mono<ServerHandle> = Mono.defer {
healthState().subscribe(healthDescription::set)
HttpServer.create()
.tcpConfiguration {
it.addressSupplier { listenAddress }
.doOnUnbound { logClose() }
}
.route { routes ->
routes.get("/health/ready", ::readinessHandler)
routes.get("/health/alive", ::livenessHandler)
routes.get("/monitoring/prometheus", ::monitoringHandler)
}
.bind()
.map { NettyServerHandle(it) }
}
private fun readinessHandler(_req: HttpServerRequest, resp: HttpServerResponse) =
healthDescription.get().run {
logger.debug { "Component status: $status, $message" }
resp.status(status.httpResponseStatus.number).sendString(Flux.just(status.toString(), "\n", message))
}
private fun livenessHandler(_req: HttpServerRequest, resp: HttpServerResponse) =
resp.status(HttpResponseStatus.NOT_IMPLEMENTED).sendString(Mono.just("Not implemented yet"))
private fun monitoringHandler(_req: HttpServerRequest, resp: HttpServerResponse) =
resp.sendString(monitoring.lastStatus())
private fun logClose() {
logger.info { "Health Check API closed" }
}
companion object {
private val logger = Logger(HealthCheckApiServer::class)
}
}
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