com.datamountaineer.streamreactor.connect.influx.InfluxSinkTask.scala Maven / Gradle / Ivy

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/*
 * Copyright 2017 Datamountaineer.
 *
 * 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.
 */

package com.datamountaineer.streamreactor.connect.influx

import java.util

import com.datamountaineer.streamreactor.connect.errors.ErrorPolicyEnum
import com.datamountaineer.streamreactor.connect.influx.config.{InfluxConfig, InfluxConfigConstants, InfluxSettings}
import com.datamountaineer.streamreactor.connect.influx.writers.{InfluxDbWriter, WriterFactoryFn}
import com.datamountaineer.streamreactor.connect.utils.{ProgressCounter, JarManifest}
import com.typesafe.scalalogging.slf4j.StrictLogging
import org.apache.kafka.clients.consumer.OffsetAndMetadata
import org.apache.kafka.common.TopicPartition
import org.apache.kafka.connect.sink.{SinkRecord, SinkTask}

import scala.collection.JavaConversions._

/**
  * InfluxSinkTask
  *
  * Kafka Connect InfluxDb sink task. Called by framework to put records to the target database
  **/
class InfluxSinkTask extends SinkTask with StrictLogging {

  var writer: Option[InfluxDbWriter] = None
  private val progressCounter = new ProgressCounter
  private var enableProgress: Boolean = false
  private val manifest = JarManifest(getClass.getProtectionDomain.getCodeSource.getLocation)

  /**
    * Parse the configurations and setup the writer
    **/
  override def start(props: util.Map[String, String]): Unit = {
    logger.info(scala.io.Source.fromInputStream(getClass.getResourceAsStream("/influx-ascii.txt")).mkString + s" v $version")
    logger.info(manifest.printManifest())

    InfluxConfig.config.parse(props)
    val sinkConfig = InfluxConfig(props)
    enableProgress = sinkConfig.getBoolean(InfluxConfigConstants.PROGRESS_COUNTER_ENABLED)
    val influxSettings = InfluxSettings(sinkConfig)

    //if error policy is retry set retry interval
    if (influxSettings.errorPolicy.equals(ErrorPolicyEnum.RETRY)) {
      context.timeout(sinkConfig.getInt(InfluxConfigConstants.ERROR_RETRY_INTERVAL_CONFIG).toLong)
    }

    writer = Some(WriterFactoryFn(influxSettings))

  }

  /**
    * Pass the SinkRecords to the writer for Writing
    **/
  override def put(records: util.Collection[SinkRecord]): Unit = {
    if (records.size() == 0) {
      logger.info("Empty list of records received.")
    }
    else {
      require(writer.nonEmpty, "Writer is not set!")
      val seq = records.toVector
      writer.foreach(w => w.write(seq))

      if (enableProgress) {
        progressCounter.update(seq)
      }
    }
  }

  /**
    * Clean up Influx connections
    **/
  override def stop(): Unit = {
    logger.info("Stopping InfluxDb sink.")
    writer.foreach(w => w.close())
    progressCounter.empty
  }

  override def version: String = manifest.version()

  override def flush(offsets: util.Map[TopicPartition, OffsetAndMetadata]): Unit = {}
}