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// Copyright (C) 2018-2023 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 DB_LOG_H
#define DB_LOG_H
#include <log/macros.h>
#include <map>
#include <mutex>
#include <list>
/// @file db_log.h
///
/// We want to reuse the database backend connection and exchange code
/// for other uses, in particular for hook libraries. But this code
/// includes some calls to the system logger for debug and uncommon
/// cases and of course we do not want to get log messages from
/// a hook library to seem to come from DHCP server core.
///
/// The solution is to use a database logger which calls the right
/// logger with mapped messages.
namespace isc {
namespace db {
///@{
/// @brief Database logging levels
///
/// Defines the levels used to output debug messages in the database
/// support. Note that higher numbers equate to more verbose (and detailed)
/// output.
/// @brief Additional information
///
/// Record detailed tracing. This is generally reserved for tracing access to
/// the lease database.
extern const int DB_DBG_TRACE_DETAIL;
///@}
/// @brief Common database library logger.
extern isc::log::Logger database_logger;
///@{
/// @brief Database messages
///
enum DbMessageID {
DB_INVALID_ACCESS,
PGSQL_DEALLOC_ERROR,
PGSQL_FATAL_ERROR,
PGSQL_START_TRANSACTION,
PGSQL_COMMIT,
PGSQL_ROLLBACK,
PGSQL_CREATE_SAVEPOINT,
PGSQL_ROLLBACK_SAVEPOINT,
PGSQL_TCP_USER_TIMEOUT_UNSUPPORTED,
MYSQL_FATAL_ERROR,
MYSQL_START_TRANSACTION,
MYSQL_COMMIT,
MYSQL_ROLLBACK,
};
///@}
/// @brief Database logger class
///
class DbLogger {
public:
/// @brief Translation map type
typedef std::map<DbMessageID, isc::log::MessageID> MessageMap;
/// @brief Constructor
///
/// @param logger logger which will be called
/// @param map message id translation map
DbLogger(isc::log::Logger& logger, const MessageMap& map)
: logger_(logger), map_(map) {
}
/// @brief Translate message
///
/// @param id database message id
/// @return logger message
/// @throw Unexpected if the id is not in the message map
const isc::log::MessageID& translateMessage(const DbMessageID& id) const;
/// @brief The logger
isc::log::Logger& logger_;
/// @brief The translation map
const MessageMap& map_;
};
/// @brief Database logger stack
typedef std::list<DbLogger> DbLoggerStack;
/// @brief Global database logger stack (initialized to database logger)
extern DbLoggerStack db_logger_stack;
/// @brief Global mutex to protect logger stack
extern std::mutex db_logger_mutex;
/// @brief Check database logger stack
///
/// @throw Unexpected if the stack is empty
void checkDbLoggerStack();
/// @brief log type enumerations for use in DB_LOG specializations
enum log_type_t {
fatal,
error,
warn,
info,
debug,
};
/// @brief DB_LOG_* logic
template <log_type_t log_type>
struct DB_LOG {
/// @brief To preserve the old way of logging, this constructor facilitates
/// initiating the DB_LOG_* chain call.
DB_LOG(DbMessageID const message_id, int const debug_level = 0) {
std::lock_guard<std::mutex> lock(isc::db::db_logger_mutex);
isc::db::checkDbLoggerStack();
if (isEnabled()) {
formatter_ = formatter(message_id, debug_level);
}
}
/// @brief Pass parameters to replace logger placeholders.
///
/// @param first the parameter to be processed now
/// @param args the parameters to be processes in recursive calls
///
/// @return reference to this object so that these calls may be chained.
template <typename T, typename... Args>
DB_LOG& arg(T first, Args... args) {
formatter_.arg(first);
return arg(args...);
}
/// @brief The last invocation of the arg() which is without parameters.
///
/// Required when using variadic arguments.
///
/// @return reference to this object so that these calls may be chained.
DB_LOG& arg() {
return *this;
}
private:
/// @brief Initializes the logging formatter.
///
/// @param message_id one of the DbMessageID enums
/// @param debug_level one of debug levels specified in log_dbglevels.h
///
/// @return the formatter responsible for logging
isc::log::Logger::Formatter
formatter(DbMessageID const message_id, int const debug_level = 0);
/// @brief Check if the logger is ready to log.
///
/// @param debug_level required only for debug log type
///
/// @return true if the logger is enabled, false otherwise
bool isEnabled(int const debug_level = 0) const;
/// @brief the formatter responsible for logging
isc::log::Logger::Formatter formatter_;
};
/// @brief all DB_LOG specializations
/// @{
struct DB_LOG_FATAL : DB_LOG<fatal> {
DB_LOG_FATAL(DbMessageID const message_id) : DB_LOG(message_id) {
}
};
struct DB_LOG_ERROR : DB_LOG<error> {
DB_LOG_ERROR(DbMessageID const message_id) : DB_LOG(message_id) {
}
};
struct DB_LOG_WARN : DB_LOG<warn> {
DB_LOG_WARN(DbMessageID const message_id) : DB_LOG(message_id) {
}
};
struct DB_LOG_INFO : DB_LOG<info> {
DB_LOG_INFO(DbMessageID const message_id) : DB_LOG(message_id) {
}
};
struct DB_LOG_DEBUG : DB_LOG<debug> {
DB_LOG_DEBUG(int const debug_level, DbMessageID const message_id)
: DB_LOG(message_id, debug_level) {
}
};
///@}
/// @brief DHCP server database message map
extern const db::DbLogger::MessageMap db_message_map;
/// @brief Database logger translator.
extern db::DbLogger db_logger_translator;
} // namespace db
} // namespace isc
#endif // DB_LOG_H
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