254 lines
9.9 KiB
C
254 lines
9.9 KiB
C
/**
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* @file
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* FSM (Finite State Machine) header of the Gem-graph client.
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*
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* @see readme.docs and this text below.
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*
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* ---
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*
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* The two log structures and the two enums needed by the logs are defined in
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* the fsm header.
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*
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* All log functions are in dedicated files.
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*
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* The most important function: fsm_add_log() is in the file:
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* /src/fsm/log/manager.c
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*
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* This file contains the declaration of the log with the **static** attribute,
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* which forces all the functions that read or write it to be in it.
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* Forcing all functions that read or write to the log to be grouped together
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* helps to prevent uncontrolled operations.
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*
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* All events sent to the log must pass through this function, which allows them
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* to be filtered before being published in the log.
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*
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* ---
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*
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* Here's how the procedure works.
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* A message is send to the fsm_add_log() function for each documented event.
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* If there are too many events, this is the only function that allows you to
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* apply one or more filters before publication. This allows you to select the
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* events of interest, which can vary depending on the type of session.
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* These filters can operate on any the following five parameters:
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* severity, source, file_source, function_source, string_value.
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* They can be combined using any logical operators and parentheses.
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*
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* 'severity' is one of the following pre-defined values:
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* FATAL - ERROR - WARN - INFO - DEBUG - TRACE
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*
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* 'source' is a pre-defined value (typically a name of a structure) that can be
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* associated to each event. It can be set to 'NULL'.
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*
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* file_source, function_source and string_value are three strings.
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*
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* ---
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*
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* The four mandatory executive functions that the log needs to init, add and
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* publish are in the dedicated file: /src/fsm/log/oper.c:
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*
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* NB: fsm_clear_log() is designed to close what was initiated by fsm_init_log().
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* As, in this commit, fsm_publish_log() is the last instruction and no memory
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* leaks are detected, the use of fsm_clear_log() is not required.
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*
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* - fsm_init_log()
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* - fsm_publish_log()
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* - fsm_clear_log()
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* - fsm_add_log_event()
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* .
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*
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* A typical list would also feature the following three functions
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* but in the case of a log, their usefulness remains to be demonstrated.
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* These functions are therefore apart in the file /src/fsm/log/appendix.c
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*
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* - fsm_get_log_length()
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* - fsm_seek_log()
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* - fsm_remove_log()
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* .
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*
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*
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* @cond LICENSE
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* This file is part of Gem-graph.
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*
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* Copyright © 2021 Libre en Communs <contact@a-lec.org>
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* Copyright © 2021-2024 Adrien Bourmault <neox@a-lec.org>
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* Copyright © 2021-2024 Jean Sirmai <jean@a-lec.org>
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* @endcond
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*/
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#pragma once
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/******************************************************************************/
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/* L O G / J O U R N A L */
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/******************************************************************************/
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/**
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* The 'severity' enum conforms to canonical log levels:
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* FATAL, ERROR, WARN, INFO, DEBUG, TRACE
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*
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* https://betterstack.com/community/guides/logging/logging-best-practices/
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* https://en.wikipedia.org/wiki/Syslog
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*
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* All logs must contain at least one item from this enum and only one.
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* This item can NOT be set to NULL.
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*
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* @see fsm_add_log()
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*/
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enum fsm_enum_log_severity {
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FATAL, /**< (or CRITICAL) an unrecoverable failure that prevents the whole
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application from doing any further useful work 🕳️☠️ */
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ERROR, /**< an irremediable situation that hinders the execution of a
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specific operation within the application 👀️😮️! */
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WARN, /**< something unexpected has occurred, but the application can
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continue to function normally for the time being 😅️ */
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INFO, /**< (or MESSAGE) a significant event occurs while the system is
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operating normally 📜️👌️ */
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DEBUG, /**< a description of system states in sufficient detail to give
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developers clues as to the cause of an error 🪳️🧐️ */
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TRACE /**< provides a systematic overview of code execution but comes at
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a cost in terms of performance 🥱️ */
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};
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/**
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* A list of structures or states that may be involved in program events.
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*
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* All logs must contain at least one item from this list or the value NULL.
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*
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* Only some main items of this list are commented on today. Further comments
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* will depend on its usage and structure which are just beginning to evolve.
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*
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* NB about PAGE: user_tree and selected_rule are two vertical panes which it
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* is a good idea to place next to each other on the rules page so that you can
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* switch between them more easily or have a parallel view of the two.
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*
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* @see fsm_add_log()
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*/
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enum fsm_enum_log_source {
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AUTO_NOTIFICATION, /**< (not a source) */
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DESTINATION, /**< SOURCE, TARGET */ SOURCE, TARGET,
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FSM_CONTENT, /**< LOG, FSM, PREFER */ LOG, FSM, PREFER,
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SRC_CONTENT, /**< MAIN, APP, WIDGETS, SIGNAL */ MAIN, APP, WIDGETS, SIGNAL,
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WINDOW, /**< MAIN, DIALOG, MODAL, TEXT */
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MAIN_WINDOW, DIALOG_WINDOW, MODAL_WINDOW, TEXT_WINDOW,
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HEADER_BAR, /**< LEFT, CENTER, RIGHT */ HEADER_BAR_LEFT, HEADER_BAR_CENTER,
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HEADER_BAR_RIGHT,
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PAGE, /**< SYNTH, STATE, RULES, [USER TREE], [SELECTED_RULE], MEASURES, RESULTS */
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SYNTH_PAGE, STATE_PAGE, RULES_PAGE, MEASURES_PAGE, RESULTS_PAGE,
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SYNTHESIS, /**< GLAREA, CAMERA, CONTROLS, RESULTS (duplicates from other pages) */
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SYNTH_GLAREA, SYNTH_CAMERA, SYNTH_CONTROLS, SYNTH_RESULTS,
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SYNTH_DATA, /**< SYNTH_TIME_DEP_RESULTS, SYNTH_TIME_INDEP_RESULTS */
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SYNTH_TIME_DEP_RESULTS, SYNTH_TIME_INDEP_RESULTS,
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STATE_VIEW, /**< TOP, BOTTOM, GLAREA, CAMERA */
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STATE_TOP, STATE_BOTTOM, STATE_GLAREA, STATE_CAMERA,
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SINGLE_RULE, /**< RULE_GEOMETRY, RULE_ALGEBRA */
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RULE_GEOMETRY, /**< VIEW_BEFORE, VIEW_AFTER, RULE_GLAREA, RULE_CAMERA */
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VIEW_BEFORE, VIEW_AFTER, RULE_GLAREA, RULE_CAMERA,
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RULE_ALGEBRA, /**< LIST_CONDITIONS, LIST_ASSIGNMENTS, IDENTITY */
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RULE_LIST_CONDITION, RULE_LIST_ASSIGNMENTS, RULE_IDENTITY,
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TREE_RULES, /**< TREE, COMPARE, USE */
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RULES_TREE, RULES_COMPARE, RULES_USE,
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MEASURES, /**< TOOLS, ACTIVITY, DISPLAY */
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MEASURES_TOOLS, MEASURES_ACTIVITY, MEASURES_DISPLAY,
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RESULTS, /**< TIME_DEPPENDENT, TIME_INDEPENDENT */
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TIME_DEP_RESULTS, TIME_INDEP_RESULTS,
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GTK_WIDGETS, /**< LABEL, BUTTON, SCROLL, GLAREA, SLIDER, EXPANDER,...
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* (non limitative) */
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WIDGET, BUTTON, SCROLL, GLAREA, TEXT, LABEL, TREE, SLIDER, EXPANDER,
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ENTRY, SLIDER_X, SLIDER_Y, SLIDER_Z, SLIDER_A, SLIDER_B, SLIDER_C,
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OTHERS, /**< fsm possible states: [EXEC / EDIT], [STATE / RULES / DATA],
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* (non limitative) */
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ON_SWITCH_EXEC_EDIT, ON_SWITCH_STATE_RULES_DATA,
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};
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//-----------------------------------------------------------------------------
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#define FILE_SOURCE_NAME_SIZE 40
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#define FUNCTION_SOURCE_NAME_SIZE 30
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#define STRING_VALUE_SIZE 50
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#define LOG_MAX_LENGTH \
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FILE_SOURCE_NAME_SIZE+FUNCTION_SOURCE_NAME_SIZE+STRING_VALUE_SIZE
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/**
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* A log unit must include the followings:
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*
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* @see fsm_log_t
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*/
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struct fsm_log_unit_t
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{
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long yy_dd_mm; /**< * date of the event reported in the log */
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long usec; /**< * with microseconds precision */
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char *restrict file_source; /**< * emitter file */
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char *restrict function_source; /**< * emitter function */
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char *restrict string_value; /**< * any event descriptors */
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struct fsm_log_unit_t *prev; /**< * chained list */
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struct fsm_log_unit_t *next; /**< * chained list */
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};
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/**
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* Log is a double-chained list. Two links towards the previous and the next unit
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* are required to initialize and manage it.
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*
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* @see fsm_log_t_unit
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*
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* @see fsm_init_log()
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* @see fsm_publish_log()
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* @see fsm_clear_log()
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* @see fsm_add_log_event()
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* @see fsm_get_log_length()
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* @see fsm_seek_log()
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* @see fsm_remove_log()
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*/
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struct fsm_log_t
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{
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struct fsm_log_unit_t *oldest; /**< * required */
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struct fsm_log_unit_t *latest; /**< * required */
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};
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//-----------------------------------------------------------------------------
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void fsm_init_log (struct fsm_log_t *);
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void fsm_publish_log (struct fsm_log_t *);
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void fsm_clear_log (struct fsm_log_t *);
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void fsm_clear_log_unit(struct fsm_log_unit_t *);
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void fsm_add_log_event (struct fsm_log_t *gg_logs,
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const char *restrict file_source,
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const char *restrict function_source,
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const char *restrict string_value);
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int fsm_get_log_length(struct fsm_log_t *);
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void fsm_seek_log (struct fsm_log_t *gg_logs,
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long usec,
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const char *restrict file_source,
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const char *restrict function_source,
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const char *restrict string_value);
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long fsm_remove_log (struct fsm_log_t *);
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void fsm_add_log (int severity,
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const char *restrict file_source,
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const char *restrict function_source,
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const char *restrict string_value);
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#define FSM_ADD_LOG(severity,string_value) \
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fsm_add_log(severity,__FILE__,__func__,string_value)
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void fsm_relay_init_log();
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void fsm_relay_close_log();
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void fsm_init();
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void fsm_close();
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