// Copyright (c) 2015, Google Inc.
//
// 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 echo;

service Echo {
  // Immediately returns an echo of a request.
  rpc Get(EchoRequest) returns (EchoResponse) {}

  // Splits a request into words and returns each word in a stream of messages.
  rpc Expand(EchoRequest) returns (stream EchoResponse) {}

  // Collects a stream of messages and returns them concatenated when the caller closes.
  rpc Collect(stream EchoRequest) returns (EchoResponse) {}

  // Streams back messages as they are received in an input stream.
  rpc Update(stream EchoRequest) returns (stream EchoResponse) {}
}

message EchoRequest {
  // The text of a message to be echoed.
  string text = 1;
}

message EchoResponse {
  // The text of an echo response.
  string text = 1;
}