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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2021 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.impl
import arrow.core.None
import arrow.core.Option
import arrow.core.toOption
import org.onap.dcae.collectors.veshv.boundary.Metrics
import org.onap.dcae.collectors.veshv.boundary.Sink
import org.onap.dcae.collectors.veshv.boundary.SinkFactory
import org.onap.dcae.collectors.veshv.config.api.model.Route
import org.onap.dcae.collectors.veshv.config.api.model.Routing
import org.onap.dcae.collectors.veshv.domain.RoutedMessage
import org.onap.dcae.collectors.veshv.domain.VesEventDomain
import org.onap.dcae.collectors.veshv.domain.VesMessage
import org.onap.dcae.collectors.veshv.domain.logging.ClientContext
import org.onap.dcae.collectors.veshv.model.ConsumedMessage
import org.onap.dcae.collectors.veshv.model.MessageDropCause
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.ves.VesEventOuterClass.CommonEventHeader
import reactor.core.publisher.Flux
internal class Router internal constructor(private val routing: Routing,
private val messageSinks: Map<String, Lazy<Sink>>,
private val ctx: ClientContext,
private val metrics: Metrics) {
constructor(routing: Routing,
sinkFactory: SinkFactory,
ctx: ClientContext,
metrics: Metrics) :
this(routing, constructMessageSinks(routing, sinkFactory, ctx), ctx, metrics) {
logger.debug(ctx::mdc) { "Routing configuration for client: $routing" }
}
fun route(message: VesMessage): Flux<ConsumedMessage> =
routeFor(message.header)
.fold({ routeNotFound(message) }, { routeFound(message, it) })
.flatMap {
val sinkTopic = it.sink.topicName()
messageSinkFor(sinkTopic).send(RoutedMessage(message, sinkTopic, NONE_PARTITION))
}
private fun routeNotFound(message: VesMessage): Flux<Route> {
metrics.notifyMessageDropped(MessageDropCause.ROUTE_NOT_FOUND)
logger.warn(ctx::fullMdc) { "Could not find route for message ${message.header}" }
logger.trace(ctx::fullMdc) { "Routing available for client: $routing" }
return Flux.empty<Route>()
}
private fun routeFound(message: VesMessage, route: Route): Flux<Route> {
logger.trace(ctx::fullMdc) {
"Found route for message ${message.header}: $route. Assigned partition: $NONE_PARTITION"
}
return Flux.just(route)
}
private fun routeFor(header: CommonEventHeader): Option<Route> =
routing.find {
if (header.domain == VesEventDomain.STND_DEFINED.domainName)
it.domain == header.stndDefinedNamespace
else {
it.domain == header.domain
}
}.toOption()
private fun messageSinkFor(sinkTopic: String) = messageSinks
.getOrElse(sinkTopic) {
throw MissingMessageSinkException("No message sink configured for sink with topic $sinkTopic")
}
companion object {
private val logger = Logger(Router::class)
private val NONE_PARTITION = None
internal fun constructMessageSinks(routing: Routing,
sinkFactory: SinkFactory,
ctx: ClientContext) =
routing.map(Route::sink)
.distinctBy { it.topicName() }
.associateBy({ it.topicName() }, { sinkFactory(it, ctx) })
}
private fun Lazy<Sink>.send(message: RoutedMessage) = value.send(message)
}
internal class MissingMessageSinkException(msg: String) : Throwable(msg)
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