syntax = "proto3";

package envoy.service.status.v4alpha;

import "envoy/admin/v4alpha/config_dump.proto";
import "envoy/config/core/v4alpha/base.proto";
import "envoy/type/matcher/v4alpha/node.proto";

import "google/api/annotations.proto";
import "google/protobuf/struct.proto";

import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";

option java_package = "io.envoyproxy.envoy.service.status.v4alpha";
option java_outer_classname = "CsdsProto";
option java_multiple_files = true;
option java_generic_services = true;
option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSION_CANDIDATE;

// [#protodoc-title: Client Status Discovery Service (CSDS)]

// CSDS is Client Status Discovery Service. It can be used to get the status of
// an xDS-compliant client from the management server's point of view. In the
// future, it can potentially be used as an interface to get the current
// state directly from the client.
service ClientStatusDiscoveryService {
  rpc StreamClientStatus(stream ClientStatusRequest) returns (stream ClientStatusResponse) {
  }

  rpc FetchClientStatus(ClientStatusRequest) returns (ClientStatusResponse) {
    option (google.api.http).post = "/v3/discovery:client_status";
    option (google.api.http).body = "*";
  }
}

// Status of a config.
enum ConfigStatus {
  // Status info is not available/unknown.
  UNKNOWN = 0;

  // Management server has sent the config to client and received ACK.
  SYNCED = 1;

  // Config is not sent.
  NOT_SENT = 2;

  // Management server has sent the config to client but hasn’t received
  // ACK/NACK.
  STALE = 3;

  // Management server has sent the config to client but received NACK.
  ERROR = 4;
}

// Request for client status of clients identified by a list of NodeMatchers.
message ClientStatusRequest {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.status.v3.ClientStatusRequest";

  // Management server can use these match criteria to identify clients.
  // The match follows OR semantics.
  repeated type.matcher.v4alpha.NodeMatcher node_matchers = 1;
}

// Detailed config (per xDS) with status.
// [#next-free-field: 7]
message PerXdsConfig {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.status.v3.PerXdsConfig";

  ConfigStatus status = 1;

  oneof per_xds_config {
    admin.v4alpha.ListenersConfigDump listener_config = 2;

    admin.v4alpha.ClustersConfigDump cluster_config = 3;

    admin.v4alpha.RoutesConfigDump route_config = 4;

    admin.v4alpha.ScopedRoutesConfigDump scoped_route_config = 5;

    // [#not-implemented-hide:]
    admin.v4alpha.EndpointsConfigDump endpoint_config = 6;
  }
}

// All xds configs for a particular client.
message ClientConfig {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.status.v3.ClientConfig";

  // Node for a particular client.
  config.core.v4alpha.Node node = 1;

  repeated PerXdsConfig xds_config = 2;
}

message ClientStatusResponse {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.service.status.v3.ClientStatusResponse";

  // Client configs for the clients specified in the ClientStatusRequest.
  repeated ClientConfig config = 1;
}