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// Copyright (C) 2017-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef HOOKS_CONFIG_H
#define HOOKS_CONFIG_H
#include <exceptions/exceptions.h>
#include <cc/data.h>
#include <cc/cfg_to_element.h>
#include <hooks/libinfo.h>
namespace isc {
namespace hooks {
/// @brief Exception thrown when a library failed to validate
class InvalidHooksLibraries : public Exception {
public:
InvalidHooksLibraries(const char* file, size_t line, const char* what) :
isc::Exception(file, line, what) { };
};
/// @brief Wrapper class that holds hooks libraries configuration
///
/// This was moved from HooksLibrariesParser
///
/// However, this class does more than just check the list of library names.
/// It does two other things:
/// # validate libraries
/// # load libraries
/// and it provides a toElement() method to unparse a configuration.
///
/// @todo add toElement() unit tests
class HooksConfig : public isc::data::CfgToElement {
public:
/// @brief Default constructor.
///
HooksConfig() : libraries_() { }
/// @brief Adds additional hooks libraries.
///
/// @param libname full filename with path to the library.
/// @param parameters map of parameters that configure the library.
void add(std::string libname, isc::data::ConstElementPtr parameters) {
libraries_.push_back(make_pair(libname, parameters));
}
/// @brief Provides access to the configured hooks libraries.
///
/// @note The const reference returned is only valid as long as the
/// object that returned it.
const isc::hooks::HookLibsCollection& get() const {
return libraries_;
}
/// @brief Removes all configured hooks libraries.
void clear() {
libraries_.clear();
}
/// @brief Compares two Hooks Config classes for equality
///
/// @param other other hooksconfig to compare with
bool equal(const HooksConfig& other) const;
/// @brief Verifies that libraries stored in libraries_ are valid.
///
/// This method is a smart wrapper around @ref
/// isc::hooks::HooksManager::validateLibraries().
/// It tries to validate all the libraries stored in libraries_.
///
/// @param position position of the hooks-library map for error reporting
/// @param multi_threading_enabled The flag which indicates if MT is enabled
/// (used to check hook libraries compatibility with MT).
///
/// @throw InvalidHooksLibraries if any issue is discovered.
void verifyLibraries(const isc::data::Element::Position& position,
bool multi_threading_enabled) const;
/// @brief Commits hooks libraries configuration.
///
/// This method calls necessary methods in HooksManager that will unload
/// any libraries that may be currently loaded and will load the actual
/// libraries. Providing that the specified libraries are valid and are
/// different to those already loaded, this method loads the new set of
/// libraries (and unloads the existing set).
///
/// @param multi_threading_enabled The flag which indicates if MT is enabled
/// (used to check hook libraries compatibility with MT).
///
/// @throw InvalidHooksLibraries if the call to HooksManager fails.
void loadLibraries(bool multi_threading_enabled) const;
/// @brief Unparse a configuration object
///
/// Returns an element which must parse into the same object, i.e.
/// @code
/// for all valid config C parse(parse(C)->toElement()) == parse(C)
/// @endcode
///
/// @return a pointer to a configuration which can be parsed into
/// the initial configuration object
isc::data::ElementPtr toElement() const;
private:
/// @brief List of hooks libraries with their configuration parameters
isc::hooks::HookLibsCollection libraries_;
};
} // namespace hooks
} // namespace isc
#endif // HOOKS_CONFIG_H
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