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/*
* Copyright (c) 2018 Cisco Systems. All rights reserved.
*
* 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.cisco.ztt.ves.telemetry
import com.cisco.ztt.Transformer
import com.cisco.pnda.model.DataPlatformEvent
import com.cisco.ztt.meta.Unit
import com.cisco.ztt.Payload
import org.apache.log4j.Logger
import org.json4s.jackson.JsonMethods
import org.json4s.JsonAST.JValue
import org.json4s.JsonAST.JObject
import com.cisco.ztt.TimeseriesDatapoint
import org.json4s.JsonAST.JArray
class VesTransformer(unit: Unit) extends Serializable with Transformer {
object Holder extends Serializable {
@transient lazy val logger = Logger.getLogger(getClass.getName)
}
def inputTopic: String = { unit.input_topic }
val mappers = unit.ves_telemetry.map(d => {
d.path.split("/") -> new VesMapper(d, unit.timeseries_namespace)
}) //.toMap
def transform(rawEvent: DataPlatformEvent): (Boolean, Set[Payload]) = {
val source = if (unit.publish_src == null) { "timeseries" } else { unit.publish_src }
val parsed = JsonMethods.parse(rawEvent.getRawdata)
if (! parsed.isInstanceOf[JObject]) {
Holder.logger.warn("Cannot process parsed JSON")
return (false, Set[Payload]())
}
val value = parsed.asInstanceOf[JObject].values.get("event").get.asInstanceOf[Map[String, JValue]]
val header = value.get("commonEventHeader").get.asInstanceOf[Map[String,Any]]
val host = header.get("reportingEntityName").get.toString
val timestamp = header.get("lastEpochMicrosec").get.toString.dropRight(3)
val generated = mappers.flatMap(r => {
val path = r._1
val mapper = r._2
val datapoints = visit(path, value, mapper, host, timestamp)
datapoints.map(d => {
new Payload(source, unit.output_topic, rawEvent.getHostIp, rawEvent.getTimestamp, d)
})
}).toSet
(true, generated)
}
def visit(
path: Array[String],
map: Map[String, Any],
mapper: VesMapper,
host: String,
timestamp: String): Set[TimeseriesDatapoint] = {
if (path.length > 0) {
val option = map.get(path.head)
option match {
case None => {
Holder.logger.warn("VES mapper failed to dereference JSON " + path.head)
return Set[TimeseriesDatapoint]()
}
case _ => {
option.get match {
case l: List[_] => {
val list = l.asInstanceOf[List[Map[String, Any]]]
return list.flatMap(sub => {
visit(path.tail, sub, mapper, host, timestamp)
}).toSet
}
case m: Map[_, _] => {
val sub = m.asInstanceOf[Map[String, Any]]
return visit(path.tail, sub, mapper, host, timestamp)
}
}
}
}
} else {
val datapoints = mapper.transform(map, host, timestamp)
return datapoints
}
Set[TimeseriesDatapoint]()
}
}
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