syntax = "proto3";

package envoy.api.v2;

import "envoy/api/v2/discovery.proto";
import "envoy/api/v2/endpoint/endpoint.proto";

import "google/api/annotations.proto";

import "validate/validate.proto";
import "gogoproto/gogo.proto";

option (gogoproto.equal_all) = true;

// [#protodoc-title: EDS]

service EndpointDiscoveryService {
  // The resource_names field in DiscoveryRequest specifies a list of clusters
  // to subscribe to updates for.
  rpc StreamEndpoints(stream DiscoveryRequest) returns (stream DiscoveryResponse) {
  }

  rpc FetchEndpoints(DiscoveryRequest) returns (DiscoveryResponse) {
    option (google.api.http) = {
      post: "/v2/discovery:endpoints"
      body: "*"
    };
  }
}

// Each route from RDS will map to a single cluster or traffic split across
// clusters using weights expressed in the RDS WeightedCluster.
//
// With EDS, each cluster is treated independently from a LB perspective, with
// LB taking place between the Localities within a cluster and at a finer
// granularity between the hosts within a locality. For a given cluster, the
// effective weight of a host is its load_balancing_weight multiplied by the
// load_balancing_weight of its Locality.
message ClusterLoadAssignment {
  // Name of the cluster. This will be the :ref:`service_name
  // <envoy_api_field_Cluster.EdsClusterConfig.service_name>` value if specified
  // in the cluster :ref:`EdsClusterConfig
  // <envoy_api_msg_Cluster.EdsClusterConfig>`.
  string cluster_name = 1 [(validate.rules).string.min_bytes = 1];

  // List of endpoints to load balance to.
  repeated endpoint.LocalityLbEndpoints endpoints = 2 [(gogoproto.nullable) = false];

  // Load balancing policy settings.
  message Policy {
    // Percentage of traffic (0-100) that should be dropped. This
    // action allows protection of upstream hosts should they unable to
    // recover from an outage or should they be unable to autoscale and hence
    // overall incoming traffic volume need to be trimmed to protect them.
    // [#v2-api-diff: This is known as maintenance mode in v1.]
    double drop_overload = 1 [(validate.rules).double = {gte: 0, lte: 100}];
  }

  // Load balancing policy settings.
  Policy policy = 4;
}