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package kamon
import com.typesafe.config.Config
import kamon.status.{Status, StatusPageServer}
import org.slf4j.LoggerFactory
import scala.util.{Failure, Success, Try}
trait StatusPage { self: Configuration with ClassLoading with ModuleLoading with Metrics with Configuration =>
private val _log = LoggerFactory.getLogger(classOf[StatusPage])
@volatile private var _statusPageServer: Option[StatusPageServer] = None
private val _status = new Status(self._moduleRegistry, self._metricsRegistry, self)
// Initial configuration and reconfigures
init(self.config())
self.onReconfigure(newConfig => self.init(newConfig))
/**
* Allows to access internal Kamon status for troubleshooting and displaying purposes. All information returned
* by the Status instance is a immutable snapshot of the current state of a given component.
*/
def status(): Status =
_status
private def init(config: Config): Unit = synchronized {
val isStatusPageEnabled = config.getBoolean("kamon.status.enabled")
if(isStatusPageEnabled) {
val hostname = config.getString("kamon.status.listen.hostname")
val port = config.getInt("kamon.status.listen.port")
_statusPageServer.fold {
// Starting a new server on the configured hostname/port
startServer(hostname, port, self.classLoader())
}(existentServer => {
// If the configuration has changed we will stop the previous version
// and start a new one with the new hostname/port.
if(existentServer.getHostname != hostname || existentServer.getListeningPort != port) {
stopServer()
startServer(hostname, port, self.classLoader())
}
})
} else {
_statusPageServer.foreach(_ => stopServer())
}
}
private def startServer(hostname: String, port: Int, resourceLoader: ClassLoader): Unit = {
Try {
val server = new StatusPageServer(hostname, port, resourceLoader, _status)
server.start()
server
} match {
case Success(server) =>
_log.info(s"Status page started on http://$hostname:$port/")
_statusPageServer = Some(server)
case Failure(t) =>
_log.error("Failed to start the status page embedded server", t)
}
}
private def stopServer(): Unit = {
_statusPageServer.foreach(_.stop())
_statusPageServer = None
}
}
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