/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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";

// This service definition is used by system_tests_grpc
service Friendship {
    // unary request that receives a person and returns a result
    rpc Create(Person) returns (CreateResult) {}
    // bilateral streaming that takes FriendshipRequests and stream FriendshipResponses back
    rpc MakeFriends(stream FriendshipRequest) returns (stream FriendshipResponse) {}
    // server streaming method that streams all friends for a given email
    rpc ListFriends(PersonEmail) returns (stream Person) {}
    // client streaming method that receive a stream of PersonEmail returning a summary with common friends
    rpc CommonFriendsCount(stream PersonEmail) returns (CommonFriendsResult) {}
}

message Person {
    string email = 1;
    string name = 2;
    repeated string friends = 3;
}

message CreateResult {
    bool success = 1;
    string message = 2;
}

message PersonEmail {
    string email = 1;
}

message CommonFriendsResult {
    repeated string friends = 1;
    int32 count = 2;
}

message FriendshipRequest {
    string email1 = 1;
    string email2 = 2;
}

message FriendshipResponse {
    Person friend1 = 1;
    Person friend2 = 2;
    string error = 3;
}