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/*
* =========================================================================================
* Copyright © 2013-2014 the kamon project <http://kamon.io/>
*
* 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 kamon.newrelic
import java.util.concurrent.TimeUnit.{ MILLISECONDS ⇒ milliseconds }
import akka.actor.{ ActorLogging, Actor }
import akka.event.LoggingAdapter
import org.slf4j.LoggerFactory
import spray.json._
import scala.concurrent.{ ExecutionContext, Future }
import spray.httpx.{ SprayJsonSupport, RequestBuilding, ResponseTransformation }
import spray.httpx.encoding.Deflate
import spray.http._
import spray.json.lenses.JsonLenses._
import java.lang.management.ManagementFactory
import spray.client.pipelining._
import scala.util.{ Failure, Success }
import spray.http.Uri.Query
import kamon.newrelic.MetricTranslator.TimeSliceMetrics
import scala.concurrent.duration._
class Agent extends Actor with RequestBuilding with ResponseTransformation with SprayJsonSupport with ActorLogging {
import context.dispatcher
import Agent._
import Retry._
self ! Initialize
val agentInfo = {
val config = context.system.settings.config.getConfig("kamon.newrelic")
val appName = config.getString("app-name")
val licenseKey = config.getString("license-key")
// Name has the format of pid@host
val runtimeName = ManagementFactory.getRuntimeMXBean.getName.split('@')
val retryDelay = FiniteDuration(config.getDuration("retry-delay", milliseconds), milliseconds)
val maxRetry = config.getInt("max-retry")
AgentInfo(licenseKey, appName, runtimeName(1), runtimeName(0).toInt, maxRetry, retryDelay)
}
val baseQuery = Query(
"license_key" -> agentInfo.licenseKey,
"marshal_format" -> "json",
"protocol_version" -> "12")
def receive: Receive = uninitialized
def uninitialized: Receive = {
case Initialize ⇒ {
connectToCollector onComplete {
case Success(agent) ⇒ {
log.info("Agent initialized with runID: [{}] and collector: [{}]", agent.runId, agent.collector)
context become reporting(agent.runId, agent.collector)
}
case Failure(reason) ⇒ self ! InitializationFailed(reason)
}
}
case InitializationFailed(reason) ⇒ {
log.info("Initialization failed: {}, retrying in {} seconds", reason.getMessage, agentInfo.retryDelay.toSeconds)
context.system.scheduler.scheduleOnce(agentInfo.retryDelay, self, Initialize)
}
case everythingElse ⇒ //ignore
}
def reporting(runId: Long, collector: String): Receive = {
case metrics: TimeSliceMetrics ⇒ sendMetricData(runId, collector, metrics)
}
def connectToCollector: Future[Initialized] = for {
collector ← selectCollector
runId ← connect(collector, agentInfo)
} yield Initialized(runId, collector)
import AgentJsonProtocol._
val compressedPipeline: HttpRequest ⇒ Future[HttpResponse] = encode(Deflate) ~> sendReceive
val compressedToJsonPipeline: HttpRequest ⇒ Future[JsValue] = compressedPipeline ~> toJson
def toJson(response: HttpResponse): JsValue = response.entity.asString.parseJson
def selectCollector: Future[String] = {
val query = ("method" -> "get_redirect_host") +: baseQuery
val getRedirectHostUri = Uri("http://collector.newrelic.com/agent_listener/invoke_raw_method").withQuery(query)
compressedToJsonPipeline {
Post(getRedirectHostUri, JsArray())
} map { json ⇒
json.extract[String]('return_value)
}
}
def connect(collectorHost: String, connect: AgentInfo): Future[Long] = {
log.debug("Connecting to NewRelic Collector [{}]", collectorHost)
val query = ("method" -> "connect") +: baseQuery
val connectUri = Uri(s"http://$collectorHost/agent_listener/invoke_raw_method").withQuery(query)
compressedToJsonPipeline {
Post(connectUri, connect)
} map { json ⇒
json.extract[Long]('return_value / 'agent_run_id)
}
}
def sendMetricData(runId: Long, collector: String, metrics: TimeSliceMetrics) = {
val query = ("method" -> "metric_data") +: ("run_id" -> runId.toString) +: baseQuery
val sendMetricDataUri = Uri(s"http://$collector/agent_listener/invoke_raw_method").withQuery(query)
withMaxAttempts(agentInfo.maxRetry, metrics, log) { currentMetrics ⇒
compressedPipeline {
log.info("Sending metrics to NewRelic collector")
Post(sendMetricDataUri, MetricData(runId, currentMetrics))
}
}
}
}
object Agent {
case class Initialize()
case class Initialized(runId: Long, collector: String)
case class InitializationFailed(reason: Throwable)
case class CollectorSelection(return_value: String)
case class AgentInfo(licenseKey: String, appName: String, host: String, pid: Int, maxRetry: Int = 0, retryDelay: FiniteDuration)
case class MetricData(runId: Long, timeSliceMetrics: TimeSliceMetrics)
}
object Retry {
@volatile private var attempts: Int = 0
@volatile private var pendingMetrics: Option[TimeSliceMetrics] = None
def withMaxAttempts[T](maxRetry: Int, metrics: TimeSliceMetrics, log: LoggingAdapter)(block: TimeSliceMetrics ⇒ Future[T])(implicit executor: ExecutionContext): Unit = {
val currentMetrics = metrics.merge(pendingMetrics)
if (currentMetrics.metrics.nonEmpty) {
block(currentMetrics) onComplete {
case Success(_) ⇒
pendingMetrics = None
attempts = 0
case Failure(_) ⇒
attempts += 1
if (maxRetry > attempts) {
log.info("Trying to send metrics to NewRelic collector, attempt [{}] of [{}]", attempts, maxRetry)
pendingMetrics = Some(currentMetrics)
} else {
log.info("Max attempts achieved, proceeding to remove all pending metrics")
pendingMetrics = None
attempts = 0
}
}
}
}
}
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