measure/src/main/scala/org/apache/griffin/measure/sink/MongoSink.scala

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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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specific language governing permissions and limitations
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*/
package org.apache.griffin.measure.sink

import scala.concurrent.Future

import org.apache.spark.rdd.RDD
import org.mongodb.scala._
import org.mongodb.scala.model.{Filters, UpdateOptions, Updates}
import org.mongodb.scala.result.UpdateResult

import org.apache.griffin.measure.utils.ParamUtil._
import org.apache.griffin.measure.utils.TimeUtil


/**
  * sink metric and record to mongo
  */
case class MongoSink(config: Map[String, Any], metricName: String,
                     timeStamp: Long, block: Boolean
                       ) extends Sink {

  MongoConnection.init(config)

  val OverTime = "over.time"
  val Retry = "retry"

  val overTime = TimeUtil.milliseconds(config.getString(OverTime, "")).getOrElse(-1L)
  val retry = config.getInt(Retry, 10)

  val _MetricName = "metricName"
  val _Timestamp = "timestamp"
  val _Value = "value"

  def available(): Boolean = MongoConnection.dataConf.available

  def start(msg: String): Unit = {}
  def finish(): Unit = {}

  def log(rt: Long, msg: String): Unit = {}

  def sinkRecords(records: RDD[String], name: String): Unit = {}
  def sinkRecords(records: Iterable[String], name: String): Unit = {}

  def sinkMetrics(metrics: Map[String, Any]): Unit = {
    mongoInsert(metrics)
  }

  private val filter = Filters.and(
    Filters.eq(_MetricName, metricName),
    Filters.eq(_Timestamp, timeStamp)
  )

  private def mongoInsert(dataMap: Map[String, Any]): Unit = {
    try {
      val update = Updates.set(_Value, dataMap)
      def func(): (Long, Future[UpdateResult]) = {
        (timeStamp, MongoConnection.getDataCollection.updateOne(
          filter, update, UpdateOptions().upsert(true)).toFuture)
      }
      if (block) SinkTaskRunner.addBlockTask(func _, retry, overTime)
      else SinkTaskRunner.addNonBlockTask(func _, retry)
    } catch {
      case e: Throwable => error(e.getMessage)
    }
  }

}

object MongoConnection {

  case class MongoConf(url: String, database: String, collection: String) {
    def available: Boolean = url.nonEmpty && database.nonEmpty && collection.nonEmpty
  }

  val _MongoHead = "mongodb://"

  val Url = "url"
  val Database = "database"
  val Collection = "collection"

  private var initialed = false

  var dataConf: MongoConf = _
  private var dataCollection: MongoCollection[Document] = _

  def getDataCollection : MongoCollection[Document] = dataCollection

  def init(config: Map[String, Any]): Unit = {
    if (!initialed) {
      dataConf = mongoConf(config)
      dataCollection = mongoCollection(dataConf)
      initialed = true
    }
  }

  private def mongoConf(cfg: Map[String, Any]): MongoConf = {
    val url = cfg.getString(Url, "").trim
    val mongoUrl = if (url.startsWith(_MongoHead)) url else {
      _MongoHead + url
    }
    MongoConf(
      mongoUrl,
      cfg.getString(Database, ""),
      cfg.getString(Collection, "")
    )
  }
  private def mongoCollection(mongoConf: MongoConf): MongoCollection[Document] = {
    val mongoClient: MongoClient = MongoClient(mongoConf.url)
    val database: MongoDatabase = mongoClient.getDatabase(mongoConf.database)
    database.getCollection(mongoConf.collection)
  }

}