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package kamon
package status
package page
import com.typesafe.config.Config
import kamon.module.Module
import org.slf4j.LoggerFactory
import scala.util.{Failure, Success, Try}
/**
* Uses an embedded web server to publish a simple status page with information about Kamon's internal status.
*/
class StatusPage extends Module {
private val _logger = LoggerFactory.getLogger(classOf[StatusPage])
@volatile private var _statusPageServer: Option[StatusPageServer] = None
override def start(): Unit =
init(Kamon.config())
override def stop(): Unit =
stopServer()
override def reconfigure(newConfig: Config): Unit =
init(newConfig)
private def init(config: Config): Unit = synchronized {
val listenConfig = config.getConfig("kamon.status-page.listen")
val hostname = listenConfig.getString("hostname")
val port = listenConfig.getInt("port")
_statusPageServer.fold {
// Starting a new server on the configured hostname/port
startServer(hostname, port, Kamon.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, Kamon.classLoader())
}
})
}
private def startServer(hostname: String, port: Int, resourceLoader: ClassLoader): Unit = {
Try {
val server = new StatusPageServer(hostname, port, resourceLoader, Kamon.status())
server.start()
server
} match {
case Success(server) =>
_logger.info(s"Status page started on http://$hostname:$port/")
_statusPageServer = Some(server)
case Failure(t) =>
_logger.error("Failed to start the status page embedded server", t)
}
}
private def stopServer(): Unit = {
_statusPageServer.foreach(_.stop())
_statusPageServer = None
}
}
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