open62541/include/ua_plugin_log.h

/* 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/. 
 *
 *    Copyright 2017 (c) Fraunhofer IOSB (Author: Julius Pfrommer)
 *    Copyright 2017 (c) Stefan Profanter, fortiss GmbH
 */

#ifndef UA_PLUGIN_LOG_H_
#define UA_PLUGIN_LOG_H_

#include <stdarg.h>
#include "ua_config.h"

_UA_BEGIN_DECLS

/**
 * Logging Plugin API
 * ==================
 *
 * Servers and clients must define a logger in their configuration. The logger
 * is just a function pointer. Every log-message consists of a log-level, a
 * log-category and a string message content. The timestamp of the log-message
 * is created within the logger. */

typedef enum {
    UA_LOGLEVEL_TRACE,
    UA_LOGLEVEL_DEBUG,
    UA_LOGLEVEL_INFO,
    UA_LOGLEVEL_WARNING,
    UA_LOGLEVEL_ERROR,
    UA_LOGLEVEL_FATAL
} UA_LogLevel;

typedef enum {
    UA_LOGCATEGORY_NETWORK,
    UA_LOGCATEGORY_SECURECHANNEL,
    UA_LOGCATEGORY_SESSION,
    UA_LOGCATEGORY_SERVER,
    UA_LOGCATEGORY_CLIENT,
    UA_LOGCATEGORY_USERLAND,
    UA_LOGCATEGORY_SECURITYPOLICY
} UA_LogCategory;

typedef struct {
    /* The message string and following varargs are formatted according to the
     * rules of the printf command. Use the convenience macros below that take
     * the minimum log-level defined in ua_config.h into account. */
    void (*log)(void *logContext, UA_LogLevel level, UA_LogCategory category,
                const char *msg, va_list args);
    void *logContext;
    void (*clear)(void *logContext);
} UA_Logger;

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_TRACE(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 100
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_TRACE, category, msg, args);
    va_end(args);
#endif
}

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_DEBUG(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 200
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_DEBUG, category, msg, args);
    va_end(args);
#endif
}

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_INFO(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 300
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_INFO, category, msg, args);
    va_end(args);
#endif
}

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_WARNING(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 400
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_WARNING, category, msg, args);
    va_end(args);
#endif
}

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_ERROR(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 500
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_ERROR, category, msg, args);
    va_end(args);
#endif
}

static UA_INLINE UA_FORMAT(3,4) void
UA_LOG_FATAL(const UA_Logger *logger, UA_LogCategory category, const char *msg, ...) {
#if UA_LOGLEVEL <= 600
    if(!logger || !logger->log)
        return;
    va_list args; va_start(args, msg);
    logger->log(logger->logContext, UA_LOGLEVEL_FATAL, category, msg, args);
    va_end(args);
#endif
}

_UA_END_DECLS

#endif /* UA_PLUGIN_LOG_H_ */