rpc Campaign (CampaignRequest) returns (CampaignResponse) { }
rpc Proclaim (ProclaimRequest) returns (ProclaimResponse) { }
rpc Leader (LeaderRequest) returns (LeaderResponse) { }
rpc Observe (LeaderRequest) returns (stream LeaderResponse) { }
rpc Resign (ResignRequest) returns (ResignResponse) { }

message CampaignRequest {
    bytes name = 1;
    int64 lease = 2;
    bytes value = 3;
}

message CampaignResponse {
    ResponseHeader header = 1;
    LeaderKey leader = 2;
}

message LeaderKey {
    bytes name = 1;
    bytes key = 2;
    int64 rev = 3;
    int64 lease = 4;
}

message ProclaimRequest {
    LeaderKey leader = 1;
    bytes value = 2;
}

message ProclaimResponse {
    ResponseHeader header = 1;
}

message LeaderRequest {
    bytes name = 1;
}

message LeaderResponse {
    ResponseHeader header = 1;
    KeyValue kv = 2;
}