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/*
* Copyright (C) 2021 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file provider_options.hpp
*
* A proxy interface to control provider configuration options.
*/
#ifndef WSREP_PROVIDER_OPTIONS_HPP
#define WSREP_PROVIDER_OPTIONS_HPP
#include "provider.hpp"
#include <functional>
#include <map>
#include <memory>
#include <string>
namespace wsrep
{
/**
* Proxy class for managing provider options.
* Options are strings by default, or flagged with corresponding
* provider_options::flag as either bool, integer or double.
*/
class provider_options
{
public:
struct flag
{
static const int deprecated = (1 << 0);
static const int readonly = (1 << 1);
static const int type_bool = (1 << 2);
static const int type_integer = (1 << 3);
static const int type_double = (1 << 4);
};
static const int flag_type_mask
= flag::type_bool | flag::type_integer | flag::type_double;
class option_value
{
public:
virtual ~option_value() {}
virtual const char* as_string() const = 0;
virtual const void* get_ptr() const = 0;
};
class option_value_string : public option_value
{
public:
option_value_string(const std::string& value)
: value_(value)
{
}
~option_value_string() WSREP_OVERRIDE {}
const char* as_string() const WSREP_OVERRIDE
{
return value_.c_str();
}
const void* get_ptr() const WSREP_OVERRIDE
{
return value_.c_str();
}
private:
std::string value_;
};
class option_value_bool : public option_value
{
public:
option_value_bool(bool value)
: value_(value)
{
}
~option_value_bool() WSREP_OVERRIDE {}
const char* as_string() const WSREP_OVERRIDE
{
if (value_)
{
return "yes";
}
else
{
return "no";
}
}
const void* get_ptr() const WSREP_OVERRIDE { return &value_; }
private:
bool value_;
};
class option_value_int : public option_value
{
public:
option_value_int(int64_t value)
: value_(value)
, value_str_(std::to_string(value))
{
}
~option_value_int() WSREP_OVERRIDE {}
const char* as_string() const WSREP_OVERRIDE
{
return value_str_.c_str();
}
const void* get_ptr() const WSREP_OVERRIDE { return &value_; }
private:
int64_t value_;
std::string value_str_;
};
class option_value_double : public option_value
{
public:
option_value_double(double value)
: value_(value)
, value_str_(std::to_string(value))
{
}
~option_value_double() WSREP_OVERRIDE {}
const char* as_string() const WSREP_OVERRIDE
{
return value_str_.c_str();
}
const void* get_ptr() const WSREP_OVERRIDE { return &value_; }
private:
double value_;
std::string value_str_;
};
class option
{
public:
option();
/** Construct option with given values. Allocates
* memory. */
option(const std::string& name, std::unique_ptr<option_value> value,
std::unique_ptr<option_value> default_value, int flags);
/** Non copy-constructible. */
option(const option&) = delete;
/** Non copy-assignable. */
option& operator=(const option&) = delete;
option(option&&) = delete;
option& operator=(option&&) = delete;
~option();
/**
* Get name of the option.
*
* @return Name of the option.
*/
const char* name() const { return name_.c_str(); }
/**
* Get the real name of the option. This displays the
* option name as it is visible in provider options.
*/
const char* real_name() const { return real_name_.c_str(); }
/**
* Get value of the option.
*
* @return Value of the option.
*/
option_value* value() const { return value_.get(); }
/**
* Get default value of the option.
*
* @return Default value of the option.
*/
option_value* default_value() const { return default_value_.get(); }
/**
* Get flags of the option
*
* @return Flag of the option
*/
int flags() const { return flags_; }
/**
* Update the value of the option with new_value. The old
* value is freed.
*/
void update_value(std::unique_ptr<option_value> new_value);
private:
/** Sanitized name with dots replaced with underscores */
std::string name_;
/** Real name in provider */
std::string real_name_;
std::unique_ptr<option_value> value_;
std::unique_ptr<option_value> default_value_;
int flags_;
};
provider_options(wsrep::provider&);
provider_options(const provider_options&) = delete;
provider_options& operator=(const provider_options&) = delete;
/**
* Set initial options. This should be used to initialize
* provider options after the provider has been loaded.
* Individual options should be accessed through set()/get().
*
* @return Provider status code.
*/
enum wsrep::provider::status initial_options();
/**
* Get the option with the given name
*
* @param name Name of the option to retrieve
*/
const option* get_option(const std::string& name) const;
/**
* Set a value for the option.
*
* @return Wsrep provider status code.
* @return wsrep::provider::error_size_exceeded if memory could
* not be allocated for the new value.
*/
enum wsrep::provider::status set(const std::string& name,
std::unique_ptr<option_value> value);
/**
* Create a new option with default value.
*/
enum wsrep::provider::status
set_default(const std::string& name,
std::unique_ptr<option_value> value,
std::unique_ptr<option_value> default_value, int flags);
void for_each(const std::function<void(option*)>& fn);
private:
provider& provider_;
using options_map = std::map<std::string, std::unique_ptr<option>>;
options_map options_;
};
/**
* Equality operator for provider option. Returns true if
* the name part is equal.
*/
bool operator==(const wsrep::provider_options::option&,
const wsrep::provider_options::option&);
} // namespace wsrep
#endif // WSREP_PROVIDER_OPTIONS_HPP
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