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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 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.kafkaconsumer.metrics
import arrow.syntax.function.memoize
import io.micrometer.core.instrument.Tag
import io.micrometer.core.instrument.Timer
import io.micrometer.prometheus.PrometheusConfig
import io.micrometer.prometheus.PrometheusMeterRegistry
import org.apache.kafka.common.TopicPartition
import org.onap.dcae.collectors.veshv.utils.TimeUtils
import reactor.core.publisher.Mono
import java.time.Duration
import java.time.Instant
import java.util.concurrent.atomic.AtomicLong
internal class MicrometerMetrics constructor(
private val registry: PrometheusMeterRegistry = PrometheusMeterRegistry(PrometheusConfig.DEFAULT)
) : Metrics {
private val currentOffsetByTopicPartition = { topicPartition: String ->
registry.gauge(name(OFFSET, PARTITION),
listOf(Tag.of(PARTITION, topicPartition)),
AtomicLong(0))
}.memoize<String, AtomicLong>()
private val travelTime = Timer.builder(name(TRAVEL,TIME))
.publishPercentileHistogram(true)
.register(registry)
fun lastStatus(): Mono<String> = Mono.fromCallable {
registry.scrape()
}
override fun notifyOffsetChanged(offset: Long, topicPartition: TopicPartition) {
currentOffsetByTopicPartition(topicPartition.toString()).set(offset)
}
override fun notifyMessageTravelTime(messageSentTimeMicros: Long) {
travelTime.record(Duration.between(TimeUtils.epochMicroToInstant(messageSentTimeMicros), Instant.now()))
}
companion object {
val INSTANCE by lazy { MicrometerMetrics() }
private const val OFFSET = "offset"
private const val PARTITION = "partition"
private const val TRAVEL = "travel"
private const val TIME = "time"
private const val PREFIX = "hv-kafka-consumer"
private fun name(vararg name: String) = "$PREFIX.${name.joinToString(".")}"
}
}
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