rpc Range (RangeRequest) returns (RangeResponse) { }

message RangeRequest {

    enum SortOrder {
        NONE = 0;
        ASCEND = 1;
        DESCEND = 2;
    }

    enum SortTarget {
        KEY = 0;
        VERSION = 1;
        CREATE = 2;
        MOD = 3;
        VALUE = 4;
    }

    bytes key = 1;
    bytes range_end = 2;

    // Restrict number of keys returned
    int64 limit = 3;

    // Possibly query historical revision
    int64 revision = 4;

    SortOrder sort_order = 5;
    SortTarget sort_target = 6;

    // Linearizable returns cluster consensus
    // Serializable can return stale data
    bool serializable = 7;

    bool keys_only = 8;
    bool count_only = 9;

    int64 min_mod_revision = 10;
    int64 max_mod_revision = 11;

    int64 min_create_revision = 12;
    int64 max_create_revision = 13;
}

message RangeResponse {
    ResponseHeader header = 1;
    repeated KeyValue kvs = 2;
    bool more = 3;
    int64 count = 4;
}