diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/status')
3 files changed, 167 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/status/JsonMarshalling.scala b/kamon-core/src/main/scala/kamon/status/JsonMarshalling.scala new file mode 100644 index 00000000..c7c480fd --- /dev/null +++ b/kamon-core/src/main/scala/kamon/status/JsonMarshalling.scala @@ -0,0 +1,65 @@ +package kamon.status + +import com.grack.nanojson.JsonWriter +import kamon.module.Module +import kamon.module.Module.Registry +import java.lang.{StringBuilder => JavaStringBuilder} + +import com.typesafe.config.ConfigRenderOptions + + +trait JsonMarshalling[T] { + + /** + * Implementations should append a Json object or array that describes the given instance members and any + * additional information that is expected to be shown in the status mini site. + */ + def toJson(instance: T, builder: JavaStringBuilder): Unit +} + +object JsonMarshalling { + + implicit object ModuleRegistryStatusJsonMarshalling extends JsonMarshalling[Module.Registry.Status] { + override def toJson(instance: Registry.Status, builder: JavaStringBuilder): Unit = { + val array = JsonWriter.on(builder) + .`object`() + .array("modules") + + instance.modules.foreach(m => { + array.`object`() + .value("name", m.name) + .value("description", m.description) + .value("enabled", m.enabled) + .value("started", m.started) + .end() + }) + + array.end().end().done() + } + } + + implicit object BaseInfoJsonMarshalling extends JsonMarshalling[Status.BaseInfo] { + override def toJson(instance: Status.BaseInfo, builder: JavaStringBuilder): Unit = { + val baseConfigJson = JsonWriter.on(builder) + .`object`() + .value("version", instance.version) + .value("config", instance.config.root().render(ConfigRenderOptions.concise())) + + baseConfigJson.`object`("environment") + .value("service", instance.environment.service) + .value("host", instance.environment.host) + .value("instance", instance.environment.instance) + .`object`("tags") + + instance.environment.tags.foreach { + case (key, value) => baseConfigJson.value(key, value) + } + + baseConfigJson + .end() // ends tags + .end() // ends environment + .end() // ends base config + .done() + } + } +}
\ No newline at end of file diff --git a/kamon-core/src/main/scala/kamon/status/Status.scala b/kamon-core/src/main/scala/kamon/status/Status.scala new file mode 100644 index 00000000..f212ff55 --- /dev/null +++ b/kamon-core/src/main/scala/kamon/status/Status.scala @@ -0,0 +1,37 @@ +package kamon.status + +import com.typesafe.config.Config +import kamon.{Configuration, Environment, Kamon} +import kamon.module.Module + + +/** + * Allows accessing of component's status APIs without exposing any other internal API from those components. + */ +class Status(_moduleRegistry: Module.Registry, configuration: Configuration) { + + def baseInfo(): Status.BaseInfo = + Status.BaseInfo(BuildInfo.version, Kamon.environment, configuration.config()) + + /** + * Information about what modules have been detected in the classpath and their current status. + */ + def moduleRegistry(): Module.Registry.Status = + _moduleRegistry.status() +} + + + + +object Status { + + case class BaseInfo( + version: String, + environment: Environment, + config: Config + ) + + + + +} diff --git a/kamon-core/src/main/scala/kamon/status/StatusPageServer.scala b/kamon-core/src/main/scala/kamon/status/StatusPageServer.scala new file mode 100644 index 00000000..4e2bf03c --- /dev/null +++ b/kamon-core/src/main/scala/kamon/status/StatusPageServer.scala @@ -0,0 +1,65 @@ +package kamon.status + +import fi.iki.elonen.NanoHTTPD +import fi.iki.elonen.NanoHTTPD.Response +import fi.iki.elonen.NanoHTTPD.Response.{Status => StatusCode} + +class StatusPageServer(hostname: String, port: Int, resourceLoader: ClassLoader, status: Status) + extends NanoHTTPD(hostname, port) { + + private val RootResourceDirectory = "status" + private val ResourceExtensionRegex = ".*\\.([a-zA-Z]*)".r + + + override def serve(session: NanoHTTPD.IHTTPSession): NanoHTTPD.Response = { + if(session.getMethod() == NanoHTTPD.Method.GET) { + if(session.getUri().startsWith("/status")) { + + // Serve the current status data on Json. + session.getUri() match { + case "/status/config" => json(status.baseInfo()) + case "/status/modules" => json(status.moduleRegistry()) + case _ => NotFound + } + + } else { + // Serve resources from the status page folder. + val resource = if (session.getUri() == "/") "/index.html" else session.getUri() + val resourcePath = RootResourceDirectory + resource + val resourceStream = resourceLoader.getResourceAsStream(resourcePath) + + if (resourceStream == null) NotFound else { + NanoHTTPD.newChunkedResponse(StatusCode.OK, mimeType(resource), resourceStream) + } + } + + } else NotAllowed + } + + private def mimeType(resource: String): String = { + val ResourceExtensionRegex(resourceExtension) = resource + resourceExtension match { + case "css" => "text/css" + case "js" => "application/javascript" + case "ico" => "image/x-icon" + case "html" => "text/html" + case _ => "text/plain" + } + } + + private def json[T : JsonMarshalling](instance: T): Response = { + val builder = new java.lang.StringBuilder() + implicitly[JsonMarshalling[T]].toJson(instance, builder) + NanoHTTPD.newFixedLengthResponse(StatusCode.OK, "application/json", builder.toString()) + } + + private val NotAllowed = NanoHTTPD.newFixedLengthResponse( + StatusCode.METHOD_NOT_ALLOWED, + NanoHTTPD.MIME_PLAINTEXT, + "Only GET requests are allowed.") + + private val NotFound = NanoHTTPD.newFixedLengthResponse( + StatusCode.NOT_FOUND, + NanoHTTPD.MIME_PLAINTEXT, + "The requested resource was not found.") +}
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