// Copyright 2019 The gRPC 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.

// This file contains the eds protocol and its dependency.
//
// TODO(juanlishen): This file is a hack to avoid a problem we're
// currently having where we can't depend on a proto file in an external
// repo due to bazel limitations.  Once that's fixed, this should be
// removed.  Until this, it should be used in the gRPC tests only, or else it
// will cause a conflict due to the same proto messages being defined in
// multiple files in the same binary.

syntax = "proto3";

package envoy.api.v2;

import "google/protobuf/any.proto";
import "src/proto/grpc/testing/xds/cds_for_test.proto";


message RouteMatch {
  oneof path_specifier {
    // If specified, the route is a prefix rule meaning that the prefix must
    // match the beginning of the *:path* header.
    string prefix = 1;
  }
}

message RouteAction {
  oneof cluster_specifier {
    // Indicates the upstream cluster to which the request should be routed
    // to.
    string cluster = 1;

    // Envoy will determine the cluster to route to by reading the value of the
    // HTTP header named by cluster_header from the request headers. If the
    // header is not found or the referenced cluster does not exist, Envoy will
    // return a 404 response.
    //
    // .. attention::
    //
    //   Internally, Envoy always uses the HTTP/2 *:authority* header to represent the HTTP/1
    //   *Host* header. Thus, if attempting to match on *Host*, match on *:authority* instead.
    string cluster_header = 2;
  }
}

message RedirectAction {}

message Route {
   RouteMatch match = 1;

   oneof action {
     // Route request to some upstream cluster.
     RouteAction route = 2;

     // Return a redirect.
     RedirectAction redirect = 3;
   }
}

message VirtualHost {
  repeated string domains = 2;
  repeated Route routes = 3;
}

message Rds {
  // Configuration source specifier for RDS.
  ConfigSource config_source = 1;

  // The name of the route configuration. This name will be passed to the RDS
  // API. This allows an Envoy configuration with multiple HTTP listeners (and
  // associated HTTP connection manager filters) to use different route
  // configurations.
  string route_config_name = 2;
}

message RouteConfiguration {
  // The name of the route configuration. For example, it might match
  // :ref:`route_config_name
  // <envoy_api_field_config.filter.network.http_connection_manager.v2.Rds.route_config_name>` in
  // :ref:`envoy_api_msg_config.filter.network.http_connection_manager.v2.Rds`.
  string name = 1;

  // An array of virtual hosts that make up the route table.
  repeated VirtualHost virtual_hosts = 2;
}

message ScopedRoutes {}

message HttpConnectionManager {
  oneof route_specifier {
    // The connection manager’s route table will be dynamically loaded via the RDS API.
    Rds rds = 3;

    // The route table for the connection manager is static and is specified in this property.
    RouteConfiguration route_config = 4;

    // A route table will be dynamically assigned to each request based on request attributes
    // (e.g., the value of a header). The "routing scopes" (i.e., route tables) and "scope keys" are
    // specified in this message.
    ScopedRoutes scoped_routes = 31;
  }
}

message ApiListener {
  // The type in this field determines the type of API listener. At present, the following
  // types are supported:
  //   envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager (HTTP)
  // [#next-major-version: In the v3 API, replace this Any field with a oneof containing the
  // specific config message for each type of API listener. We could not do this in v2 because
  // it would have caused circular dependencies for go protos: lds.proto depends on this file,
  // and http_connection_manager.proto depends on rds.proto, which is in the same directory as
  // lds.proto, so lds.proto cannot depend on this file.]
  google.protobuf.Any api_listener = 1;
}

message Listener {
  string name = 1;

  // Used to represent an API listener, which is used in non-proxy clients. The type of API
  // exposed to the non-proxy application depends on the type of API listener.
  // When this field is set, no other field except for :ref:`name<envoy_api_field_Listener.name>`
  // should be set.
  //
  // .. note::
  //
  //  Currently only one ApiListener can be installed; and it can only be done via bootstrap config,
  //  not LDS.
  //
  // [#next-major-version: In the v3 API, instead of this messy approach where the socket
  // listener fields are directly in the top-level Listener message and the API listener types
  // are in the ApiListener message, the socket listener messages should be in their own message,
  // and the top-level Listener should essentially be a oneof that selects between the
  // socket listener and the various types of API listener. That way, a given Listener message
  // can structurally only contain the fields of the relevant type.]
  ApiListener api_listener = 19;
}
