com.twitter.server.view.EndpointRegistryView.scala Maven / Gradle / Ivy

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package com.twitter.server.view

import com.twitter.finagle.{Addr, Dentry, Dtab}
import com.twitter.finagle.Namer.AddrWeightKey

private[server] object EndpointRegistryView {

  private[this] def renderDtab(dtab: Dtab): String =
    s"""
      
      ${
        (for (Dentry(prefix, dst) <- dtab) yield {
          s"""${prefix.show} => ${dst.show}"""
        }).mkString("")

      }
      """

  /**
   * Render current weights and socket addresses for paths in each dtab
   * @param observations Map of Dtabs to map of paths to Addrs
   */
  def render(
    dtabEntries: Map[Dtab, Map[String, Addr]]
  ): String =
    s"""
    
      
        Endpoints
        
        ${
          (for((dtab, observations) <- dtabEntries) yield {
            s"""
            Dtab

              ${renderDtab(dtab)}
              Resolved Endpoints

                
                ${
                  (for((path, addr) <- observations) yield {
                    s"""Path: ${path}
""" +
                    (addr match {
                      case Addr.Bound(endpoints, metadata) =>
                        val weight: Double = metadata.get(AddrWeightKey) match {
                          case Some(w: Double) => w
                          case Some(failed) =>
                            // Namer records weights as Doubles, so this should never happen.
                            -1.0
                          case None => 1.0
                        }
                        s"""Weight: ${weight}

                            Endpoints:

                              
                              ${
                                (for(endpoint <- endpoints) yield {
                                    s"""${endpoint}"""
                                }).mkString("\n")
                              }
                              
                        """
                      case Addr.Failed(why) =>
                        s"""Endpoint Resolution Failed: ${why}"""
                      case _ =>
                        s"""Unbound Addr: ${addr}"""
                    })
                  }).mkString("\n")
                }
                
              
            """
          }).mkString("\n")
        }
        
      
    """
}