// Copyright 2021 Unistack LLC
//
// 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 micro.proto;

option cc_enable_arenas = true;
option go_package = "github.com/unistack-org/micro-proto/micro;micro";
option java_multiple_files = true;
option java_outer_classname = "MicroProto";
option java_package = "micro.proto";
option objc_class_prefix = "MPROTO";

// Message that represents an arbitrary byes. It should only be used for
// payload formats that can't be represented as any other messages like raw binary.
//
//
// This message can be used both in streaming and non-streaming API methods in
// the request as well as the response.
//
// It can be used as a top-level request field, which is convenient if one
// wants to extract parameters from either the URL or HTTP template into the
// request fields and also want access to the raw HTTP body.
//
// Example:
//
//     message GetResourceRequest {
//       // A unique request id.
//       string request_id = 1;
//
//       // The raw HTTP body is bound to this field.
//       micro.proto.Frame http_body = 2;
//     }
//
//     service ResourceService {
//       rpc GetResource(GetResourceRequest) returns (micro.proto.Frame);
//       rpc UpdateResource(micro.proto.Frame) returns
//       (google.protobuf.Empty);
//     }
//
// Example with streaming methods:
//
//     service CaldavService {
//       rpc GetCalendar(stream micro.proto.Frame)
//         returns (stream micro.proto.Frame);
//       rpc UpdateCalendar(stream micro.proto.Frame)
//         returns (stream micro.proto.Frame);
//     }
//
// Use of this type only changes how the request and response bodies are
// handled, all other features will continue to work unchanged.
message Frame {
  // Application specific response metadata. Must be set in the first response
  // for streaming APIs.
  map<string,string> headers = 1;
  // The HTTP request/response body as raw binary.
  bytes data = 2;
}