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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package ly.stealth.kafka.riemann
import kafka.consumer.{ConsumerConfig, Consumer}
import kafka.serializer._
import java.util.Properties
import kafka.utils.Logging
import scala.collection.JavaConversions._
import net.benmur.riemann.client._
import RiemannClient._
import akka.util.Timeout
import akka.actor.ActorSystem
import java.net.InetSocketAddress
import com.fasterxml.jackson.databind.ObjectMapper
import kafka.consumer.Whitelist
abstract class RiemannMetricsConsumer(riemannHost: String,
riemannPort: Integer,
descriptionText: String,
tagList: String,
topic: String,
groupId: String,
zookeeperConnect: String,
zkSessionTimeoutMs: Int = 30000,
readFromStartOfStream: Boolean = true,
stateMatcher: (String, Double) => String = null,
defaultState: String = "info") extends Logging {
val props = new Properties()
props.put("group.id", groupId)
props.put("zookeeper.connect", zookeeperConnect)
props.put("auto.offset.reset", if (readFromStartOfStream) "smallest" else "largest")
props.put("zookeeper.session.timeout.ms", zkSessionTimeoutMs.toString)
val config = new ConsumerConfig(props)
val connector = Consumer.create(config)
val filterSpec = new Whitelist(topic)
val mapper = new ObjectMapper();
info("Trying to start consumer: topic=%s for zk=%s and groupId=%s".format(topic, zookeeperConnect, groupId))
val stream = connector.createMessageStreamsByFilter(filterSpec, 1, new StringDecoder(), new StringDecoder()).get(0)
info("Started consumer: topic=%s for zk=%s and groupId=%s".format(topic, zookeeperConnect, groupId))
implicit val system = ActorSystem()
implicit val timeout = Timeout(15)
val metricsDestination = riemannConnectAs[Reliable] to new InetSocketAddress(riemannHost, riemannPort) withValues (host("host")
| description(descriptionText) | tags(tagList))
def transfer[T](onlyOnce: Boolean = false)
protected def sendMetric(name: String, metricValue: Double, tagged: String = null) = {
if (tagged == null)
state(detectMetricState(name, metricValue)) | service(name) | metric(metricValue) |>> metricsDestination
else
state(detectMetricState(name, metricValue)) | service(name) | metric(metricValue) | tags(tagged) |>> metricsDestination
}
protected def detectMetricState(name: String, metricValue: Double): String = {
if (stateMatcher == null) defaultState
else stateMatcher(name, metricValue)
}
def close() {
connector.shutdown()
}
}