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/*
* Copyright (c) 2019, 2025, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2.0,
* as published by the Free Software Foundation.
*
* This program is designed to work with certain software (including
* but not limited to OpenSSL) that is licensed under separate terms,
* as designated in a particular file or component or in included license
* documentation. The authors of MySQL hereby grant you an additional
* permission to link the program and your derivative works with the
* separately licensed software that they have either included with
* the program or referenced in the documentation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License, version 2.0, for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// MySQL DB access module, for use by plugins and others
// For the module that implements interactive DB functionality see mod_db
#include "plugin/x/client/xcompression_negotiator.h"
#include <string>
#include <vector>
#include "mysqlxclient/xcompression.h"
#include "plugin/x/client/mysqlxclient/xargument.h"
#include "plugin/x/client/mysqlxclient/xerror.h"
#include "plugin/x/client/validator/option_compression_validator.h"
namespace xcl {
namespace {
template <typename Validator>
class To_variable_validator : public Validator {
public:
using Base = Validator;
using Array_of_enums = typename Base::Array_of_enums;
using Array_of_strings = typename Base::Array_of_strings;
public:
Array_of_enums m_enum_result;
Array_of_strings m_string_result;
bool ignore_unkown_text_values() const override { return true; }
void store_to_result(const Argument_value &value) {
Base::store(nullptr, value);
}
void visit_translate_with_source(
const Array_of_enums &enum_result,
const Array_of_strings &string_result) override {
m_enum_result = enum_result;
m_string_result = string_result;
}
};
} // namespace
void Capabilities_negotiator::server_supports_algorithms(
const Array_of_strings &server_supported_algorithms) {
class Compression_algorithms_validator2
: public Translate_array_validator<Compression_algorithm, Context,
false> {
public:
Compression_algorithms_validator2()
: Translate_array_validator(
{{"DEFLATE_STREAM", Compression_algorithm::k_deflate},
{"LZ4_MESSAGE", Compression_algorithm::k_lz4},
{"ZSTD_STREAM", Compression_algorithm::k_zstd}}) {}
void visit_translate(const Array_of_enums &algos) override {}
};
To_variable_validator<Compression_algorithms_validator2> validator;
check_server_capability(&validator, server_supported_algorithms,
m_compression_negotiation_algorithm,
&m_choosen_algorithm, &m_choosen_algorithm_txt);
}
bool Capabilities_negotiator::is_negotiation_needed() const {
return m_compression_mode != Compression_negotiation::k_disabled;
}
bool Capabilities_negotiator::update_compression_options(
Compression_algorithm *out_algorithm, XError *out_error) {
if (!was_chooses()) {
if (is_compression_required()) {
*out_error =
XError{CR_X_REQUIRED_COMPRESSION_NOT_SUPPORTED,
"Client's requirement for compression configuration is "
"not supported by server or it was disabled"};
}
return false;
}
*out_algorithm = m_choosen_algorithm;
return true;
}
bool Capabilities_negotiator::is_compression_preferred() const {
return m_compression_mode == Compression_negotiation::k_preferred;
}
bool Capabilities_negotiator::is_compression_required() const {
return m_compression_mode == Compression_negotiation::k_required;
}
bool Capabilities_negotiator::was_chooses() const {
if (m_choosen_algorithm == Compression_algorithm::k_none) return false;
if (!m_compression_negotiation_algorithm.empty() &&
m_choosen_algorithm == Compression_algorithm::k_none)
return false;
return true;
}
} // namespace xcl
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