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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.system
import java.io.{ File, IOException }
import akka.actor.{ Actor, ActorLogging, Props }
import kamon.Kamon
import kamon.metric.Metrics
import kamon.metrics.CPUMetrics.CPUMetricRecorder
import kamon.metrics.ContextSwitchesMetrics.ContextSwitchesMetricsRecorder
import kamon.metrics.MemoryMetrics.MemoryMetricRecorder
import kamon.metrics.NetworkMetrics.NetworkMetricRecorder
import kamon.metrics.ProcessCPUMetrics.ProcessCPUMetricsRecorder
import kamon.metrics._
import kamon.sigar.SigarProvisioner
import org.hyperic.sigar.{ Sigar, Mem, NetInterfaceStat, SigarProxy }
import scala.concurrent.duration.FiniteDuration
import scala.io.Source
import scala.util.control.NonFatal
class SystemMetricsCollector(collectInterval: FiniteDuration) extends Actor with ActorLogging with SystemMetricsBanner {
import kamon.system.SystemMetricsCollector._
import kamon.system.SystemMetricsExtension._
lazy val sigar = createSigarInstance
def pid = sigar.getPid
val interfaces: Set[String] = sigar.getNetInterfaceList.toSet
val systemMetricsExtension = Kamon(Metrics)(context.system)
val collectSchedule = context.system.scheduler.schedule(collectInterval, collectInterval, self, Collect)(context.dispatcher)
val cpuRecorder = systemMetricsExtension.register(CPUMetrics(CPU), CPUMetrics.Factory)
val processCpuRecorder = systemMetricsExtension.register(ProcessCPUMetrics(ProcessCPU), ProcessCPUMetrics.Factory)
val memoryRecorder = systemMetricsExtension.register(MemoryMetrics(Memory), MemoryMetrics.Factory)
val networkRecorder = systemMetricsExtension.register(NetworkMetrics(Network), NetworkMetrics.Factory)
val contextSwitchesRecorder = systemMetricsExtension.register(ContextSwitchesMetrics(ContextSwitches), ContextSwitchesMetrics.Factory)
def receive: Receive = {
case Collect ⇒ collectMetrics()
}
override def postStop() = collectSchedule.cancel()
def collectMetrics() = {
cpuRecorder.map(recordCpu)
processCpuRecorder.map(recordProcessCpu)
memoryRecorder.map(recordMemory)
networkRecorder.map(recordNetwork)
if (OsUtils.isLinux)
contextSwitchesRecorder.map(recordContextSwitches)
}
private def recordCpu(cpur: CPUMetricRecorder) = {
val cpuPerc = sigar.getCpuPerc
cpur.user.record(toLong(cpuPerc.getUser))
cpur.system.record(toLong(cpuPerc.getSys))
cpur.cpuWait.record(toLong(cpuPerc.getWait))
cpur.idle.record(toLong(cpuPerc.getIdle))
cpur.stolen.record(toLong(cpuPerc.getStolen))
}
private def recordProcessCpu(pcpur: ProcessCPUMetricsRecorder) = {
val procCpu = sigar.getProcCpu(pid)
val procTime = sigar.getProcTime(pid)
pcpur.cpuPercent.record(toLong(procCpu.getPercent))
pcpur.totalProcessTime.record(procTime.getTotal) // gives an idea of what is really measured and then interpreted as %
}
private def recordMemory(mr: MemoryMetricRecorder) = {
val mem = sigar.getMem
val swap = sigar.getSwap
mr.used.record(toMB(mem.getUsed))
mr.free.record(toMB(mem.getFree))
mr.swapUsed.record(toMB(swap.getUsed))
mr.swapFree.record(toMB(swap.getFree))
mr.buffer.record(toMB(collectBuffer(mem)))
mr.cache.record(toMB(collectCache(mem)))
def collectBuffer(mem: Mem): Long = if (mem.getUsed != mem.getActualUsed) mem.getActualUsed else 0L
def collectCache(mem: Mem): Long = if (mem.getFree != mem.getActualFree) mem.getActualFree else 0L
}
private def recordNetwork(nr: NetworkMetricRecorder) = {
nr.rxBytes.record(collect(sigar, interfaces)(net ⇒ toKB(net.getRxBytes)))
nr.txBytes.record(collect(sigar, interfaces)(net ⇒ toKB(net.getTxBytes)))
nr.rxErrors.record(collect(sigar, interfaces)(net ⇒ net.getRxErrors))
nr.txErrors.record(collect(sigar, interfaces)(net ⇒ net.getTxErrors))
nr.rxDropped.record(collect(sigar, interfaces)(net ⇒ net.getRxDropped))
nr.txDropped.record(collect(sigar, interfaces)(net ⇒ net.getTxDropped))
def collect(sigar: SigarProxy, interfaces: Set[String])(block: NetInterfaceStat ⇒ Long): Long = {
interfaces.foldLeft(0L) { (totalBytes, interface) ⇒
{
val net = sigar.getNetInterfaceStat(interface)
totalBytes + block(net)
}
}
}
}
private def recordContextSwitches(rcs: ContextSwitchesMetricsRecorder) = {
def contextSwitchesByProcess(pid: Long): (Long, Long) = {
val filename = s"/proc/$pid/status"
var voluntaryContextSwitches = 0L
var nonVoluntaryContextSwitches = 0L
try {
for (line ← Source.fromFile(filename).getLines()) {
if (line.startsWith("voluntary_ctxt_switches")) {
voluntaryContextSwitches = line.substring(line.indexOf(":") + 1).trim.toLong
}
if (line.startsWith("nonvoluntary_ctxt_switches")) {
nonVoluntaryContextSwitches = line.substring(line.indexOf(":") + 1).trim.toLong
}
}
} catch {
case ex: IOException ⇒ log.error("Error trying to read [{}]", filename)
}
(voluntaryContextSwitches, nonVoluntaryContextSwitches)
}
def contextSwitches: Long = {
val filename = "/proc/stat"
var contextSwitches = 0L
try {
for (line ← Source.fromFile(filename).getLines()) {
if (line.startsWith("rcs")) {
contextSwitches = line.substring(line.indexOf(" ") + 1).toLong
}
}
} catch {
case ex: IOException ⇒ log.error("Error trying to read [{}]", filename)
}
contextSwitches
}
val (perProcessVoluntary, perProcessNonVoluntary) = contextSwitchesByProcess(pid)
rcs.perProcessVoluntary.record(perProcessVoluntary)
rcs.perProcessNonVoluntary.record(perProcessNonVoluntary)
rcs.global.record(contextSwitches)
}
def verifiedSigarInstance: SigarProxy = {
val sigar = new Sigar()
printBanner(sigar)
sigar
}
def provisionSigarLibrary: Unit = {
val folder = context.system.settings.config.getString("kamon.sigar.folder")
SigarProvisioner.provision(new File(folder))
}
def createSigarInstance: SigarProxy = {
// 1) Assume that library is already provisioned.
try {
return verifiedSigarInstance
} catch {
// Not using [[Try]] - any error is non-fatal in this case.
case e: Throwable ⇒ log.info(s"Sigar is not yet provisioned: ${e}")
}
// 2) Attempt to provision library via sigar-loader.
try {
provisionSigarLibrary
return verifiedSigarInstance
} catch {
// Not using [[Try]] - any error is non-fatal in this case.
case e: Throwable ⇒ throw new UnexpectedSigarException(s"Failed to load Sigar: ${e}")
}
}
}
object SystemMetricsCollector {
case object Collect
object OsUtils {
def isLinux: Boolean = System.getProperty("os.name").indexOf("Linux") != -1
}
def props(collectInterval: FiniteDuration): Props = Props(classOf[SystemMetricsCollector], collectInterval)
}
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