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/*
* IoT Common V1.1.0
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file iot_logging.h
* @brief Generic logging function header file.
*
* Declares the generic logging function and the log levels. This file never
* needs to be included in source code. The header iot_logging_setup.h should
* be included instead.
*
* @see iot_logging_setup.h
*/
#ifndef IOT_LOGGING_H_
#define IOT_LOGGING_H_
/* The config header is always included first. */
#include "iot_config.h"
/* Standard includes. */
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/**
* @constantspage{logging,logging library}
*
* @section logging_constants_levels Log levels
* @brief Log levels for the libraries in this SDK.
*
* Each library should specify a log level by setting @ref LIBRARY_LOG_LEVEL.
* All log messages with a level at or below the specified level will be printed
* for that library.
*
* Currently, there are 4 log levels. In the order of lowest to highest, they are:
* - #IOT_LOG_NONE <br>
* @copybrief IOT_LOG_NONE
* - #IOT_LOG_ERROR <br>
* @copybrief IOT_LOG_ERROR
* - #IOT_LOG_WARN <br>
* @copybrief IOT_LOG_WARN
* - #IOT_LOG_INFO <br>
* @copybrief IOT_LOG_INFO
* - #IOT_LOG_DEBUG <br>
* @copybrief IOT_LOG_DEBUG
*/
/**
* @brief No log messages.
*
* Log messages with this level will be silently discarded. When @ref
* LIBRARY_LOG_LEVEL is #IOT_LOG_NONE, logging is disabled and no [logging functions]
* (@ref logging_functions) can be called.
*/
#define IOT_LOG_NONE 0
/**
* @brief Only critical, unrecoverable errors.
*
* Log messages with this level will be printed when a library encounters an
* error from which it cannot easily recover.
*/
#define IOT_LOG_ERROR 1
/**
* @brief Message about an abnormal but recoverable event.
*
* Log messages with this level will be printed when a library encounters an
* abnormal event that may be indicative of an error. Libraries should continue
* execution after logging a warning.
*/
#define IOT_LOG_WARN 2
/**
* @brief A helpful, informational message.
*
* Log messages with this level may indicate the normal status of a library
* function. They should be used to track how far a program has executed.
*/
#define IOT_LOG_INFO 3
/**
* @brief Detailed and excessive debug information.
*
* Log messages with this level are intended for developers. They may contain
* excessive information such as internal variables, buffers, or other specific
* information.
*/
#define IOT_LOG_DEBUG 4
/**
* @paramstructs{logging,logging}
*/
/**
* @ingroup logging_datatypes_paramstructs
* @brief Log message configuration struct.
*
* @paramfor @ref logging_function_log, @ref logging_function_generic
*
* By default, log messages print the library name, log level, and a timestring.
* This struct can be passed to @ref logging_function_generic to disable one of
* the above components in the log message.
*
* <b>Example:</b>
*
* @code{c}
* IotLog_Generic( IOT_LOG_DEBUG, "SAMPLE", IOT_LOG_DEBUG, NULL, "Hello world!" );
* @endcode
* The code above prints the following message:
* @code
* [DEBUG][SAMPLE][2018-01-01 12:00:00] Hello world!
* @endcode
*
* The timestring can be disabled as follows:
* @code
* IotLogConfig_t logConfig = { .hideLogLevel = false, .hideLibraryName = false, .hideTimestring = true};
* IotLog_Generic( IOT_LOG_DEBUG, "SAMPLE", IOT_LOG_DEBUG, &logConfig, "Hello world!" );
* @endcode
* The resulting log message will be:
* @code
* [DEBUG][SAMPLE] Hello world!
* @endcode
*/
typedef struct IotLogConfig
{
bool hideLogLevel; /**< @brief Don't print the log level string for this message. */
bool hideLibraryName; /**< @brief Don't print the library name for this message. */
bool hideTimestring; /**< @brief Don't print the timestring for this message. */
} IotLogConfig_t;
/**
* @functionspage{logging,logging library}
*
* - @functionname{logging_function_log}
* - @functionname{logging_function_printbuffer}
* - @functionname{logging_function_generic}
* - @functionname{logging_function_genericprintbuffer}
*/
/**
* @functionpage{IotLog_Generic,logging,generic}
* @functionpage{IotLog_PrintBuffer,logging,genericprintbuffer}
*/
/**
* @brief Generic logging function that prints a single message.
*
* This function is the generic logging function shared across all libraries.
* The library-specific logging function @ref logging_function_log is implemented
* using this function. Like @ref logging_function_log, this function is only
* available when @ref LIBRARY_LOG_LEVEL is #IOT_LOG_NONE.
*
* In most cases, the library-specific logging function @ref logging_function_log
* should be called instead of this function.
*
* @param[in] libraryLogSetting The log level setting of the library, used to
* determine if the log message should be printed. Must be one of the @ref
* logging_constants_levels.
* @param[in] pLibraryName The library name to print. See @ref LIBRARY_LOG_NAME.
* @param[in] messageLevel The log level of the this message. See @ref LIBRARY_LOG_LEVEL.
* @param[in] pLogConfig Pointer to a #IotLogConfig_t. Optional; pass `NULL` to ignore.
* @param[in] pFormat Format string for the log message.
* @param[in] ... Arguments for format specification.
*
* @return No return value. On errors, it prints nothing.
*/
/* @[declare_logging_generic] */
void IotLog_Generic( int libraryLogSetting,
const char * const pLibraryName,
int messageLevel,
const IotLogConfig_t * const pLogConfig,
const char * const pFormat,
... );
/* @[declare_logging_generic] */
/**
* @brief Generic function to log the contents of a buffer as bytes.
*
* This function is the generic buffer logging function shared across all libraries.
* The library-specific buffer logging function @ref logging_function_printbuffer is
* implemented using this function. Like @ref logging_function_printbuffer, this
* function is only available when @ref LIBRARY_LOG_LEVEL is #IOT_LOG_DEBUG.
*
* In most cases, the library-specific buffer logging function @ref
* logging_function_printbuffer should be called instead of this function.
*
* @param[in] pLibraryName The library name to print with the log. See @ref LIBRARY_LOG_NAME.
* @param[in] pHeader A message to print before printing the buffer.
* @param[in] pBuffer The buffer to print.
* @param[in] bufferSize The number of bytes in `pBuffer` to print.
*
* @return No return value. On errors, it prints nothing.
*
* @note To conserve memory, this function only allocates enough memory for a
* single line of output. Therefore, in multithreaded systems, its output may
* appear "fragmented" if other threads are logging simultaneously.
*/
/* @[declare_logging_genericprintbuffer] */
void IotLog_GenericPrintBuffer( const char * const pLibraryName,
const char * const pHeader,
const uint8_t * const pBuffer,
size_t bufferSize );
/* @[declare_logging_genericprintbuffer] */
#endif /* ifndef IOT_LOGGING_H_ */
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