221 lines
7.2 KiB
C
221 lines
7.2 KiB
C
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <maxscale/cdefs.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <maxscale/jansson.h>
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MXS_BEGIN_DECLS
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/**
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* If MXS_MODULE_NAME is defined before log_manager.h is included, then all
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* logged messages will be prefixed with that string enclosed in square brackets.
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* For instance, the following
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*
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* #define MXS_MODULE_NAME "xyz"
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* #include <log_manager.h>
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*
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* will lead to every logged message looking like:
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*
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* 2016-08-12 13:49:11 error : [xyz] The gadget was not ready
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*
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* In general, the value of MXS_MODULE_NAME should be the name of the shared
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* library to which the source file, where MXS_MODULE_NAME is defined, belongs.
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*
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* Note that a file that is compiled into multiple modules should
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* have MXS_MODULE_NAME defined as something else than the name of a real
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* module, or not at all.
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*
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* Any file that is compiled into maxscale-common should *not* have
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* MXS_MODULE_NAME defined.
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*/
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#if !defined(MXS_MODULE_NAME)
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#define MXS_MODULE_NAME NULL
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#endif
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typedef enum
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{
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MXS_LOG_TARGET_DEFAULT = 0,
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MXS_LOG_TARGET_FS = 1, // File system
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MXS_LOG_TARGET_SHMEM = 2, // Shared memory
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MXS_LOG_TARGET_STDOUT = 3, // Standard output
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} mxs_log_target_t;
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/**
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* Thread-specific logging information.
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*/
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typedef struct mxs_log_info
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{
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size_t li_sesid;
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int li_enabled_priorities;
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} mxs_log_info_t;
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extern int mxs_log_enabled_priorities;
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/**
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* Check if specified log type is enabled in general or if it is enabled
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* for the current session.
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*
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* @param priority One of the syslog LOG_ERR, LOG_WARNING, etc. constants.
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*/
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#define MXS_LOG_PRIORITY_IS_ENABLED(priority) \
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((mxs_log_enabled_priorities & (1 << priority)) ? true : false)
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/**
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* LOG_AUGMENT_WITH_FUNCTION Each logged line is suffixed with [function-name].
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*/
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typedef enum
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{
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MXS_LOG_AUGMENT_WITH_FUNCTION = 1,
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MXS_LOG_AUGMENTATION_MASK = (MXS_LOG_AUGMENT_WITH_FUNCTION)
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} mxs_log_augmentation_t;
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typedef struct mxs_log_throttling
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{
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size_t count; // Maximum number of a specific message...
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size_t window_ms; // ...during this many milliseconds.
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size_t suppress_ms; // If exceeded, suppress such messages for this many ms.
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} MXS_LOG_THROTTLING;
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bool mxs_log_init(const char* ident, const char* logdir, mxs_log_target_t target);
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void mxs_log_finish(void);
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int mxs_log_flush();
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int mxs_log_flush_sync();
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int mxs_log_rotate();
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int mxs_log_set_priority_enabled(int priority, bool enabled);
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void mxs_log_set_syslog_enabled(bool enabled);
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void mxs_log_set_maxlog_enabled(bool enabled);
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void mxs_log_set_highprecision_enabled(bool enabled);
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void mxs_log_set_augmentation(int bits);
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void mxs_log_set_throttling(const MXS_LOG_THROTTLING* throttling);
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void mxs_log_get_throttling(MXS_LOG_THROTTLING* throttling);
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json_t* mxs_logs_to_json(const char* host);
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static inline bool mxs_log_priority_is_enabled(int priority)
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{
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assert((priority & ~LOG_PRIMASK) == 0);
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return MXS_LOG_PRIORITY_IS_ENABLED(priority) || priority == LOG_ALERT;
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}
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int mxs_log_message(int priority,
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const char* modname,
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const char* file, int line, const char* function,
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const char* format, ...) mxs_attribute((format(printf, 6, 7)));
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/**
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* Log an error, warning, notice, info, or debug message.
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*
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* @param priority One of the syslog constants (LOG_ERR, LOG_WARNING, ...)
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* @param format The printf format of the message.
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* @param ... Arguments, depending on the format.
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*
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* NOTE: Should typically not be called directly. Use some of the
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* MXS_ERROR, MXS_WARNING, etc. macros instead.
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*/
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#define MXS_LOG_MESSAGE(priority, format, ...)\
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(mxs_log_priority_is_enabled(priority) ? \
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mxs_log_message(priority, MXS_MODULE_NAME, __FILE__, __LINE__, __func__, format, ##__VA_ARGS__) :\
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0)
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/**
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* Log an alert, error, warning, notice, info, or debug message.
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*
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* MXS_ALERT Not throttled To be used when the system is about to go down in flames.
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* MXS_ERROR Throttled For errors.
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* MXS_WARNING Throttled For warnings.
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* MXS_NOTICE Not Throttled For messages deemed important, typically used during startup.
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* MXS_INFO Not Throttled For information thought to be of value for investigating some problem.
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* MXS_DEBUG Not Throttled For debugging messages during development. Should be removed when a
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* feature is ready.
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*
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* @param format The printf format of the message.
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* @param ... Arguments, depending on the format.
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*/
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#define MXS_ALERT(format, ...) MXS_LOG_MESSAGE(LOG_ALERT, format, ##__VA_ARGS__)
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#define MXS_ERROR(format, ...) MXS_LOG_MESSAGE(LOG_ERR, format, ##__VA_ARGS__)
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#define MXS_WARNING(format, ...) MXS_LOG_MESSAGE(LOG_WARNING, format, ##__VA_ARGS__)
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#define MXS_NOTICE(format, ...) MXS_LOG_MESSAGE(LOG_NOTICE, format, ##__VA_ARGS__)
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#define MXS_INFO(format, ...) MXS_LOG_MESSAGE(LOG_INFO, format, ##__VA_ARGS__)
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#if defined(SS_DEBUG)
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#define MXS_DEBUG(format, ...) MXS_LOG_MESSAGE(LOG_DEBUG, format, ##__VA_ARGS__)
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#else
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#define MXS_DEBUG(format, ...)
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#endif
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/**
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* Log an out of memory error using custom message.
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*
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* @param message Text to be logged.
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*/
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// TODO: In an OOM situation, the default logging will (most likely) *not* work,
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// TODO: as memory is allocated as part of the process. A custom route, that does
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// TODO: not allocate memory, must be created for OOM messages.
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// TODO: So, currently these are primarily placeholders.
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#define MXS_OOM_MESSAGE(message) MXS_ERROR("OOM: %s", message);
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/**
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* Log an out of memory error using custom message, if the
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* provided pointer is NULL.
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*
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* @param p If NULL, an OOM message will be logged.
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* @param message Text to be logged.
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*/
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#define MXS_OOM_MESSAGE_IFNULL(p, m) do { if (!p) { MXS_OOM_MESSAGE(m); } } while (false)
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/**
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* Log an out of memory error using a default message.
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*/
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#define MXS_OOM() MXS_OOM_MESSAGE(__func__)
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/**
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* Log an out of memory error using a default message, if the
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* provided pointer is NULL.
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*
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* @param p If NULL, an OOM message will be logged.
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*/
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#define MXS_OOM_IFNULL(p) do { if (!p) { MXS_OOM(); } } while (false)
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enum
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{
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MXS_OOM_MESSAGE_MAXLEN = 80 /** Maximum length of an OOM message, including the
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trailing NULL. If longer, it will be cut. */
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};
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/**
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* Return a thread specific pointer to a string describing the error
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* code passed as argument. The string is obtained using strerror_r.
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*
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* @param error One of the errno error codes.
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*
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* @return Thread specific pointer to string describing the error code.
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*
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* @attention The function is thread safe, but not re-entrant. That is,
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* calling it twice with different error codes between two sequence points
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* will not work. E.g:
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*
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* printf("EINVAL = %s, EACCESS = %s",
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* mxs_strerror(EINVAL), mxs_strerror(EACCESS));
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*/
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const char* mxs_strerror(int error);
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MXS_END_DECLS
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