app/sexamples/embedlog: This example program presents most usefull features of embedlog library and how to use them.
This commit is contained in:
Michał Łyszczek
Gregory Nutt
parent
af9b5762c2
commit
c8106558d1
12
examples/embedlog/.gitignore
vendored
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12
examples/embedlog/.gitignore
vendored
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/hello
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/Make.dep
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/.depend
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/.built
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/*.asm
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/*.obj
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/*.rel
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/*.lst
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/*.sym
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/*.adb
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/*.lib
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/*.src
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46
examples/embedlog/Kconfig
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46
examples/embedlog/Kconfig
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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comment "embedlog example needs SYSTEM_EMBEDLOG"
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depends on !SYSTEM_EMBEDLOG
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if SYSTEM_EMBEDLOG
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config EXAMPLES_EMBEDLOG
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bool "embedlog example"
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default n
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select EMBEDLOG_ENABLE_OUT_FILE
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select EMBEDLOG_ENABLE_OUT_STDERR
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select EMBEDLOG_ENABLE_OUT_TTY
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select EMBEDLOG_ENABLE_OUT_CUSTOM
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select EMBEDLOG_ENABLE_BINARY_LOGS
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select EMBEDLOG_ENABLE_TIMESTAMP
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select EMBEDLOG_ENABLE_FRACTIONS
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select EMBEDLOG_ENABLE_PREFIX
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select EMBEDLOG_ENABLE_FINFO
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select EMBEDLOG_ENABLE_COLORS
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---help---
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Enable the "embedlog" example.
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if EXAMPLES_EMBEDLOG
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config EXAMPLES_EMBEDLOG_PROGNAME
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string "Program name"
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default "embedlog"
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depends on BUILD_KERNEL
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---help---
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This is the name of the program that will be use when the NSH ELF
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program is installed.
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config EXAMPLES_EMBEDLOG_PRIORITY
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int "embedlog example task priority"
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default 100
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config EXAMPLES_EMBEDLOG_STACKSIZE
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int "embedlog example stack size"
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default 2048
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endif #EXAMPLES_EMBEDLOG
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endif #SYSTEM_EMBEDLOG
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39
examples/embedlog/Make.defs
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39
examples/embedlog/Make.defs
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############################################################################
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# apps/examples/embedlog/Make.defs
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# Adds selected applications to apps/ build
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#
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# Copyright (C) 2019 Michał Łyszczek. All rights reserved.
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# Author: Michał Łyszczek <michal.lyszczek@bofc.pl>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name NuttX nor the names of its contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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ifeq ($(CONFIG_EXAMPLES_EMBEDLOG),y)
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CONFIGURED_APPS += examples/embedlog
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endif
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57
examples/embedlog/Makefile
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57
examples/embedlog/Makefile
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############################################################################
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# apps/examples/embedlog/Makefile
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#
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# Copyright (C) 2019 Michał Łyszczek. All rights reserved.
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# Author: Michał Łyszczek <michal.lyszczek@bofc.pl>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
|
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
|
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# notice, this list of conditions and the following disclaimer in
|
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name NuttX nor the names of its contributors may be
|
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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-include $(TOPDIR)/Make.defs
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# embedlog example built-in application info
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CONFIG_EXAMPLES_EMBEDLOG_PRIORITY ?= SCHED_PRIORITY_DEFAULT
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CONFIG_EXAMPLES_EMBEDLOG_STACKSIZE ?= 2048
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APPNAME = $(CONFIG_EXAMPLES_EMBEDLOG_PROGNAME)
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PRIORITY = $(CONFIG_EXAMPLES_EMBEDLOG_PRIORITY)
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STACKSIZE = $(CONFIG_EXAMPLES_EMBEDLOG_STACKSIZE)
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# embedlog Example
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ASRCS =
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CSRCS =
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MAINSRC = embedlog_main.c
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CFLAGS += -I$(APPDIR)/include/system
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CONFIG_EXAMPLES_EMBEDLOG_PROGNAME ?= embedlog$(EXEEXT)
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PROGNAME = $(CONFIG_EXAMPLES_EMBEDLOG_PROGNAME)
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include $(APPDIR)/Application.mk
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354
examples/embedlog/embedlog_main.c
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354
examples/embedlog/embedlog_main.c
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/****************************************************************************
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* examples/embedlog/embedlog_main.c
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*
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* Copyright (C) 2019 Michał Łyszczek. All rights reserved.
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* Author: Michał Łyszczek <michal.lyszczek@bofc.pl>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
|
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* used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <embedlog.h>
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#include <errno.h>
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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/****************************************************************************
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* Preprocessor macros
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****************************************************************************/
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/* Macro used by OEL* macros, so we don't have to specify &g_el every time
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* we want to print something.
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*/
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#define EL_OPTIONS_OBJECT &g_el
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/****************************************************************************
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* Global variables
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****************************************************************************/
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/* Logger state, in flat build you need to create embedlog object and use it
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* with el_o* functions. It is so, because embedlog defines one global object
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* to make it easier to use embedlog on systems with MMU where each thread
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* has it's own global memory. In nuttx in flat build that single object is
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* shared between *all* tasks. You could probably get away with this if you
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* use embedlog only in one task, but it's usually not the case. So in nuttx
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* always create embedlog object. You can define EL_OPTIONS_OBJECT macro and
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* use OEL* macros to make it almost as easy as using embedlog with global
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* object. see el_options(3) to see learn more about it.
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*/
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static struct el_options g_el;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: el_print_options
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*
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* Description:
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* Presents how to use options and how it's rendered. This assumes all
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* options are enabled in compile time. If any of the options is not enabled
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* in compile time, setting it will have no effect and logs will vary.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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static void el_print_options(void)
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{
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/* We will be printing logs to standard error output only */
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el_ooption(&g_el, EL_OUT, EL_OUT_STDERR);
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el_ooption(&g_el, EL_PRINT_LEVEL, 0);
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el_oprint(OELI, "We can disable information about log level");
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el_oprint(OELF, "message still will be filtered by log level");
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el_oprint(OELA, "but there is no way to tell what level message is");
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el_oprint(OELD, "like this message will not be printed");
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el_ooption(&g_el, EL_TS, EL_TS_SHORT);
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el_oprint(OELF, "As every respected logger, we also have timestamps");
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el_oprint(OELF, "which work well with time from time()");
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el_ooption(&g_el, EL_TS_TM, EL_TS_TM_MONOTONIC);
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el_oprint(OELF, "or CLOCK_MONOTONIC from POSIX");
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el_ooption(&g_el, EL_TS, EL_TS_LONG);
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el_ooption(&g_el, EL_TS_TM, EL_TS_TM_TIME);
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el_oprint(OELF, "we also have long format that works well with time()");
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el_ooption(&g_el, EL_TS_TM, EL_TS_TM_REALTIME);
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el_oprint(OELF, "if higher precision is needed we can use CLOCK_REALTIME");
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el_ooption(&g_el, EL_TS, EL_TS_SHORT);
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el_oprint(OELF, "we can also mix REALTIME with short format");
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el_ooption(&g_el, EL_TS_FRACT, EL_TS_FRACT_OFF);
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el_oprint(OELF, "and if you don't need high resolution");
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el_oprint(OELF, "you can disable fractions of seconds to save space!");
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el_ooption(&g_el, EL_TS_FRACT, EL_TS_FRACT_MS);
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el_oprint(OELF, "or enable only millisecond resolution");
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el_ooption(&g_el, EL_TS_FRACT, EL_TS_FRACT_US);
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el_oprint(OELF, "or enable only microsecond resolution");
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el_ooption(&g_el, EL_TS_FRACT, EL_TS_FRACT_NS);
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el_oprint(OELF, "or enable only nanosecond resolution "
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"(not that it makes much sense on nuttx)");
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el_ooption(&g_el, EL_TS, EL_TS_LONG);
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el_ooption(&g_el, EL_TS, EL_TS_OFF);
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el_oprint(OELF, "no time information, if your heart desire it");
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el_ooption(&g_el, EL_TS_FRACT, EL_TS_FRACT_NS);
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el_ooption(&g_el, EL_FINFO, 1);
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el_oprint(OELF, "log location is very usefull for debuging");
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el_ooption(&g_el, EL_TS, EL_TS_LONG);
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el_ooption(&g_el, EL_TS_TM, EL_TS_TM_REALTIME);
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el_ooption(&g_el, EL_PRINT_LEVEL, 1);
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el_oprint(OELF, "Different scenarios need different options");
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el_oprint(OELA, "So we can mix options however we want");
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el_ooption(&g_el, EL_PRINT_NL, 0);
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el_oprint(OELF, "you can also remove printing new line ");
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el_oputs(&g_el, "to join el_oprint and el_oputs in a single ");
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el_oputs(&g_el, "long line as needed\n");
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el_ooption(&g_el, EL_PRINT_NL, 1);
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el_ooption(&g_el, EL_COLORS, 1);
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el_ooption(&g_el, EL_LEVEL, EL_DBG);
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el_oprint(OELD, "And if we have");
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el_oprint(OELI, "modern terminal");
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el_oprint(OELN, "we can enable colors");
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el_oprint(OELW, "to spot warnings");
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el_oprint(OELE, "or errors");
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el_oprint(OELC, "with a quick");
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el_oprint(OELA, "glance into");
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el_oprint(OELF, "log file");
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el_ooption(&g_el, EL_PREFIX, "embedlog: ");
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el_oprint(OELI, "you can also use prefixes");
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el_oprint(OELI, "to every message you send");
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el_ooption(&g_el, EL_PREFIX, NULL);
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el_oprint(OELI, "set prefix to null to disable it");
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}
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/****************************************************************************
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* Name: el_print_memory
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*
|
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* Description:
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* Presents how to print blob of memory.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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static void el_print_memory(void)
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{
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char s[] = "some message\0that contains\0null characters";
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char ascii[128];
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int i;
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for (i = 0; i != 128; ++i)
|
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{
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ascii[i] = (char)i;
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}
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/* We will be printing logs to standard error output only */
|
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el_ooption(&g_el, EL_OUT, EL_OUT_STDERR);
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el_oprint(OELI, "print whole ASCII table");
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el_opmemory(OELI, ascii, sizeof(ascii));
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el_oprint(OELI, "print memory region that contains string with NULL chars");
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el_opmemory(OELI, s, sizeof(s));
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el_oprint(OELI, "print the same region but this time with nice ascii table");
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el_opmemory_table(OELI, s, sizeof(s));
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}
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/****************************************************************************
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* Name: el_print_file
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*
|
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* Description:
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* Presents how to print data to file with log rotation
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*
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* Input Parameters:
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* workdir - directory where logs will be stored.
|
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*
|
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* Returned Value:
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* None.
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*
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****************************************************************************/
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|
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static void el_print_file(const char *workdir)
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{
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char log_path[PATH_MAX];
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|
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/* create user specified directory if it doesn't exist */
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|
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if (mkdir(workdir, 0755) != 0 && errno != EEXIST)
|
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{
|
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fprintf(stderr, "Couldn't create %s, error %s\n",
|
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workdir, strerror(errno));
|
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return;
|
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}
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/* Create full path to log file embedlog will use */
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sprintf(log_path, "%s/log-rotate", workdir);
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/* Enable file rotation, maximum 5 files will be created, none of the log
|
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* files size shall exceed 512 bytes. Rotate size is low to present how
|
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* rotation works, in real life this should be much higher, unless you
|
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* really know what you are doing and understand the consequences of low
|
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* rotate size.
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*/
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el_ooption(&g_el, EL_FROTATE_NUMBER, 5);
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el_ooption(&g_el, EL_FROTATE_SIZE, 512);
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/* Tell embedlog to sync all buffers and metadata regarding log file.
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* There are cases, when data (a lot of data) goes into block device,
|
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* but metadata of the file are not updated when power loss occurs. This
|
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* leads to data loss - even though they landed physically on block device
|
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* like sdcard. To prevent losing too much data, you can define how often
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* you want embedlog to call sync() functions. It basically translates to
|
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* "how much data am I ready to loose?". In this example, we sync() once
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* every 4096 bytes are stored into file.
|
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*/
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el_ooption(&g_el, EL_FILE_SYNC_EVERY, 4096);
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|
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/* Setting above value to too small value, will cause sync() to be called
|
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* very often (depending on how much data you log) and that may criple
|
||||
* performance greatly. And there are situations when you are willing to
|
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* loose some info or debug data (up to configured sync every value), but
|
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* when critical error shows up, you want data to be synced immediately to
|
||||
* minimize chance of loosing information about critical error. For that
|
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* you can define which log level will be synced *every* time regardless
|
||||
* of sync every value. Here we will instruct embedlog to log prints that
|
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* have severity higher or equal to critical (so critial, alert and fatal)
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*/
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el_ooption(&g_el, EL_FILE_SYNC_LEVEL, EL_CRIT);
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/* Print logs to both file and standard error */
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|
||||
el_ooption(&g_el, EL_OUT, EL_OUT_FILE | EL_OUT_STDERR);
|
||||
|
||||
/* Register path to log file in embedlog. This will cause logger to look
|
||||
* for next valid log file (when log rotate in enabled) and will try to
|
||||
* open file for reading.
|
||||
*/
|
||||
|
||||
if (el_ooption(&g_el, EL_FPATH, log_path) != 0)
|
||||
{
|
||||
if (errno == ENAMETOOLONG || errno == EINVAL)
|
||||
{
|
||||
/* These are the only unrecoverable errors that embedlog may return,
|
||||
* any other error it actually a warning, telling user that file
|
||||
* could not have been opened now, but every el_print function with
|
||||
* output to file enabled, will try to reopen file. This of course
|
||||
* apply to situation when problem is temporary - like directory does
|
||||
* not exist but will be created after warning, or file has no write
|
||||
* permission but it gets fixed later.
|
||||
*/
|
||||
|
||||
fprintf(stderr, "log file name too long");
|
||||
return;
|
||||
}
|
||||
|
||||
fprintf(stderr, "WARNING: couldn't open file: %s\n", strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
/* Now we can print messages */
|
||||
|
||||
el_oprint(OELI, "Now we enabled log rotation");
|
||||
el_oprint(OELI, "If log cannot fit in current file");
|
||||
el_oprint(OELI, "it will be stored in new file");
|
||||
el_oprint(OELI, "and if library creates EL_FROTATE_NUMBER files");
|
||||
el_oprint(OELI, "oldest file will be deleted and new file will be created");
|
||||
el_oprint(OELI, "run this program multiple times and see how it works");
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* embedlog_main
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_BUILD_KERNEL
|
||||
int main(int argc, FAR char *argv[])
|
||||
#else
|
||||
int embedlog_main(int argc, FAR char *argv[])
|
||||
#endif
|
||||
{
|
||||
if (argc > 2 || (argc == 2 && strcmp(argv[1], "-h") == 0))
|
||||
{
|
||||
fprintf(stderr, "usage: %s [<log-directory>]\n", argv[0]);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Initialize embedlog object to sane and known values */
|
||||
|
||||
el_oinit(&g_el);
|
||||
|
||||
el_oprint(OELI, "Right after init, embedlog will print to stderr with just "
|
||||
"log level information - these are default settings.");
|
||||
|
||||
el_print_options();
|
||||
el_print_memory();
|
||||
|
||||
if (argc == 2)
|
||||
{
|
||||
el_print_file(argv[1]);
|
||||
}
|
||||
|
||||
/* This will cleanup whatever has been allocated by el_oinit(), like opened
|
||||
* file descriptors
|
||||
*/
|
||||
|
||||
el_ocleanup(&g_el);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user