// Copyright 2025 Envoy Project Authors
//
// Licensed 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 = "proto3";

package envoy.extensions.filters.network.generic_proxy.router.v3;

import "xds/annotations/v3/status.proto";

import "udpa/annotations/status.proto";

option java_package = "io.envoyproxy.envoy.extensions.filters.network.generic_proxy.router.v3";
option java_outer_classname = "RouterProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/generic_proxy/router/v3;routerv3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;
option (xds.annotations.v3.file_status).work_in_progress = true;

// [#protodoc-title: Router for generic proxy]
// [#extension: envoy.filters.generic.router]

message Router {
  // Set to true if the upstream connection should be bound to the downstream connection, false
  // otherwise.
  //
  // By default, one random upstream connection will be selected from the upstream connection pool
  // and used for every request. And after the request is finished, the upstream connection will be
  // released back to the upstream connection pool.
  //
  // If this option is true, the upstream connection will be bound to the downstream connection and
  // have same lifetime as the downstream connection. The same upstream connection will be used for
  // all requests from the same downstream connection.
  //
  // And if this options is true, one of the following requirements must be met:
  //
  // 1. The request must be handled one by one. That is, the next request can not be sent to the
  //    upstream until the previous request is finished.
  // 2. Unique request id must be provided for each request and response. The request id must be
  //    unique for each request and response pair in same connection pair. And the request id must
  //    be the same for the corresponding request and response.
  //
  // This could be useful for some protocols that require the same upstream connection to be used
  // for all requests from the same downstream connection. For example, the protocol using stateful
  // connection.
  bool bind_upstream_connection = 1;
}
