com.twitter.server.handler.RegistryHandler.scala Maven / Gradle / Ivy

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package com.twitter.server.handler

import com.twitter.finagle.Service
import com.twitter.finagle.http.{Request, Response}
import com.twitter.server.util.HttpUtils.newOk
import com.twitter.server.util.JsonConverter
import com.twitter.util.Future
import com.twitter.util.registry.{Formatter, GlobalRegistry}

/**
 * A [[com.twitter.finagle.Service]] for displaying the current state of the
 * registry.
 *
 * It's intended to be used as a handler for TwitterServer, and
 * doesn't take any arguments yet.  As an admin endpoint, it displays
 * the entire registry in JSON.
 */
class RegistryHandler extends Service[Request, Response] {
  // TODO: have nice default HTML rendering for json output
  def apply(req: Request): Future[Response] = {
    newOk(jsonResponse())
  }

  private[handler] def jsonResponse(): String = {
    val registry = GlobalRegistry.get
    JsonConverter.writeToString(Formatter.asMap(registry))
  }
}