ScalaQuery.scala

/*
 * The MIT License
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 * of this software and associated documentation files (the "Software"), to deal
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
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 *
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package example

import akka.actor.ActorSystem
import akka.stream.scaladsl.Sink
import com.influxdb.client.scala.InfluxDBClientScalaFactory
import com.influxdb.query.FluxRecord

import scala.concurrent.Await
import scala.concurrent.duration.Duration

object ScalaQuery {

  implicit val system: ActorSystem = ActorSystem("examples")

  def main(args: Array[String]): Unit = {

    val influxDBClient = InfluxDBClientScalaFactory
      .create("http://localhost:8086", "my-token".toCharArray, "my-org")

    val fluxQuery = ("from(bucket: \"my-bucket\")\n"
      + " |> range(start: -1d)"
      + " |> filter(fn: (r) => (r[\"_measurement\"] == \"cpu\" and r[\"_field\"] == \"usage_system\"))")

    //Result is returned as a stream
    val results = influxDBClient.getQueryScalaApi().query(fluxQuery)

    //Example of additional result stream processing on client side
    val sink = results
      //filter on client side using `filter` built-in operator
      .filter(it => "cpu0" == it.getValueByKey("cpu"))
      //take first 20 records
      .take(20)
      //print results
      .runWith(Sink.foreach[FluxRecord](it => println(s"Measurement: ${it.getMeasurement}, value: ${it.getValue}")
      ))

    // wait to finish
    Await.result(sink, Duration.Inf)

    influxDBClient.close()
    system.terminate()
  }
}