// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto2";

import "mesos/mesos.proto";

import "mesos/maintenance/maintenance.proto";

import "mesos/quota/quota.proto";

import "resource_provider/registry.proto";

package mesos.internal;

/**
 * A top level object that is managed by the Registrar and persisted in a
 * replicated log.  This object is recovered upon master startup and failover.
 */
message Registry {
  // NOTE: This object defines wrappers around existing objects in case
  // the Registry wishes to store more information about the wrapped objects
  // in the future.

  message Master {
    required MasterInfo info = 1;
  }

  message Slave {
    required SlaveInfo info = 1;
  }

  message Slaves {
    repeated Slave slaves = 1;
  }

  message UnreachableSlave {
    required SlaveID id = 1;

    // The time when the slave was marked unreachable by the master.
    required TimeInfo timestamp = 2;
  }

  message UnreachableSlaves {
    repeated UnreachableSlave slaves = 1;
  }

  message GoneSlave {
    required SlaveID id = 1;

    // The time when the slave was marked gone by the master.
    required TimeInfo timestamp = 2;
  }

  message GoneSlaves {
    repeated GoneSlave slaves = 1;
  }

  message Machine {
    required MachineInfo info = 1;
  }

  message Machines {
    repeated Machine machines = 1;
  }

  message Quota {
    required quota.QuotaInfo info = 1;
  }

  message Weight {
    required WeightInfo info = 1;
  }

  // The minimum set of `MasterInfo::Capability` that the master reading
  // this registry should be capable of.  If the master is upgraded
  // or downgraded and no longer satisfies these capabilities, the
  // master is expected to exit upon recovery.
  //
  // We do not use `MasterInfo::Capability` in this field directly
  // because the enumeration may be extended in later Mesos versions.
  // If an earlier version is given an enum value from a later version,
  // the protobuf parser will interpret this as an `UNKNOWN` capability,
  // and we will be unable to provide remediation text to the operator.
  message MinimumCapability {
    required string capability = 1;
  }

  // Most recent leading master.
  optional Master master = 1;

  // All admitted (healthy) slaves.
  optional Slaves slaves = 2;

  // Slaves that have failed health checks. They may or may not still
  // be running.
  //
  // New entries are added to the end of this list; hence the first
  // element of the list was added first (although if there is clock
  // drift, it might not necessarily have the smallest timestamp). The
  // size of this list is limited by the `registry_max_agent_age` and
  // `registry_max_agent_count` flags.
  optional UnreachableSlaves unreachable = 7;

  // Slaves that have been explicitly marked as failed (no longer running)
  // by the operator. They may or may not still be running.
  //
  // New entries are added to the end of this list; hence the first
  // element of the list was added first (although if there is clock
  // drift, it might not necessarily have the smallest timestamp).
  optional GoneSlaves gone = 8;

  // Holds a list of machines and some status information about each.
  // See comments in `MachineInfo` for more information.
  optional Machines machines = 3;

  // Describes a schedule for taking down specific machines for maintenance.
  // The schedule is meant to give hints to frameworks about potential
  // unavailability of resources.  The `schedules` are related to the status
  // information found in `machines`.
  repeated maintenance.Schedule schedules = 4;

  // A list of recorded quotas in the cluster. It does not hold an actual
  // assignment of resources, a newly elected master shall reconstruct it
  // from the cluster.
  repeated Quota quotas = 5;

  // A list of recorded weights in the cluster, a newly elected master shall
  // reconstruct it from the registry.
  repeated Weight weights = 6;

  // All known resource providers.
  optional resource_provider.registry.Registry resource_provider_registry = 9;

  repeated MinimumCapability minimum_capabilities = 10;
}