// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

syntax = "proto3";

package hashicorp.consul.catalog.v1alpha1;

import "pbresource/resource.proto";

// This is a Resource type.
message FailoverPolicy {
  // Config defines failover for any named port not present in PortConfigs.
  FailoverConfig config = 1;

  // PortConfigs defines failover for a specific port on this service and takes
  // precedence over Config.
  map<string, FailoverConfig> port_configs = 2;
}

message FailoverConfig {
  // Destinations specifies a fixed list of failover destinations to try. We
  // never try a destination multiple times, so those are subtracted from this
  // list before proceeding.
  repeated FailoverDestination destinations = 1;

  // Mode specifies the type of failover that will be performed. Valid values are
  // "sequential", "" (equivalent to "sequential") and "order-by-locality".
  FailoverMode mode = 2;
  repeated string regions = 3;

  // SamenessGroup specifies the sameness group to failover to.
  string sameness_group = 4;
}

message FailoverDestination {
  // This must be a Service.
  hashicorp.consul.resource.Reference ref = 1;
  // TODO: what should an empty port mean?
  string port = 2;
  string datacenter = 3;
}

enum FailoverMode {
  FAILOVER_MODE_UNSPECIFIED = 0;
  FAILOVER_MODE_SEQUENTIAL = 1;
  FAILOVER_MODE_ORDER_BY_LOCALITY = 2;
}