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lognestmonster / c487a24

A general-purpose single-header C logging library and parser for event-based logs. (Incomplete)

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19006 Feb 2020 18:38c487a24Remove tag functionality from log statementsJosh Stockin11836G

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1/* lognestmonster Copyright (c) 2020 Joshua 'joshuas3' Stockin
2 * <https://joshstock.in>
3 * <https://github.com/JoshuaS3/lognestmonster>
4 *
5 * This software is licensed and distributed under the terms of the MIT License:
6 * ----- BEGIN LICENSE -----
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 * ----- END LICENSE -----
25 *
26 * This comment block and its contents, including this disclaimer, MUST be
27 * preserved in all copies or distributions of this software's source.
28 */
29
30// lognestmonster.h
31// C header file for implementation of the lognestmonster logging library
32
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38
39#ifndef LOGNESTMONSTER_H
40#define LOGNESTMONSTER_H 1
41
42
43#include <stdint.h> // necessary include for type declaration
44
45
46enum lnmVerbosityLevel {lnmInfo, lnmDebug, lnmVerbose, lnmVeryVerbose, lnmWarning, lnmError};
47typedef uint8_t * lnmItem;
48typedef uint8_t * lnmQueue;
49
50
51lnmQueue lnmQueueInit(char * name, char * out_path);
52lnmQueue lnmQueueByName(char * name);
53
54lnmItem lnmStatement(enum lnmVerbosityLevel verbosity, char * message);
55
56lnmItem lnmEvent(char * tag);
57lnmItem lnmEventI(char * tag, lnmItem item);
58lnmItem lnmEventS(char * tag, enum lnmVerbosityLevel verbosity, char * message);
59void lnmEventPush(lnmItem event, lnmItem item);
60void lnmEventPushS(lnmItem event, enum lnmVerbosityLevel verbosity, char * message);
61
62
63#ifdef LNM_ALL // expose private utilities
64
65// type definitions
66typedef struct lnm_pushable lnm_pushable;
67typedef struct lnm_log_event lnm_log_event;
68typedef struct lnm_log_statement lnm_log_statement;
69typedef struct lnm_queue lnm_queue;
70
71// lnm_pushable utilities
72lnm_pushable * lnm_new_pushable(void);
73void lnm_pushable_realloc(lnm_pushable * pushable);
74void lnm_pushable_push(lnm_pushable * pushable, lnmItem item);
75void lnm_pushable_pop(lnm_pushable * pushable);
76void lnm_pushable_remove(lnm_pushable * pushable, uint32_t index);
77void lnm_pushable_free(lnm_pushable * pushable);
78
79// misc utilities
80unsigned long lnm_getus(void);
81
82// registry utilities
83void lnm_registry_update(void);
84
85// memory management utilities
86void lnm_free_item(lnmItem item);
87void lnm_free_registry(void);
88void lnm_free_queue(lnmQueue queue);
89
90#endif // LNM_ALL
91
92
93#if defined(LNM_DEBUG) || defined(LNM_ALL)
94void lnm_debug_tabs(int tab_count);
95void lnm_debug_parse_item(lnmItem item, int tab_count);
96void lnm_debug_parse_registry(void);
97void lnm_debug_parse_queue(lnmQueue queue);
98#endif // LNM_DEBUG || LNM_ALL
99
100
101#ifdef LNM_INIT // define the library
102
103
104#include <stdint.h>
105#include <stdio.h>
106#include <stdlib.h>
107#include <string.h>
108
109
110static const uint8_t LNM_STATEMENT = 0;
111static const uint8_t LNM_EVENT = 1;
112
113
114// lnm_pushable utilities
115
116
117typedef struct lnm_pushable {
118 uint32_t capacity;
119 uint32_t length;
120 lnmItem * frame;
121} lnm_pushable;
122
123
124void lnm_pushable_realloc(lnm_pushable * pushable) {
125 if (pushable->length > pushable->capacity) {
126 if (pushable->capacity > UINT32_MAX / 2) {
127 printf("lognestmonster (lnm_pushable_realloc): pushable reached max capacity of 2^32-1. exiting...\n");
128 abort();
129 }
130 pushable->frame = realloc(pushable->frame, sizeof(lnmItem) * (pushable->capacity *= 2));
131 if (pushable->frame == NULL) {
132 printf("lognestmonster (lnm_pushable_realloc): call to realloc() returned NULL. exiting...\n");
133 abort();
134 }
135 } else if (pushable->length < (pushable->capacity / 2)) {
136 if (pushable->capacity > 8) {
137 pushable->frame = realloc(pushable->frame, sizeof(lnmItem) * (pushable->capacity /= 2));
138 if (pushable->frame == NULL) {
139 printf("lognestmonster (lnm_pushable_realloc): call to realloc() returned NULL. exiting...\n");
140 abort();
141 }
142 }
143 }
144}
145
146
147lnm_pushable * lnm_new_pushable(void) {
148 lnm_pushable * new_pushable = malloc(sizeof(lnm_pushable));
149 if (new_pushable == NULL) {
150 printf("lognestmonster (lnm_new_pushable): call to malloc() returned NULL. exiting...\n");
151 abort();
152 }
153 new_pushable->capacity = 8;
154 new_pushable->length = 0;
155 new_pushable->frame = malloc(sizeof(lnmItem) * 8);
156 if (new_pushable->frame == NULL) {
157 printf("lognestmonster (lnm_new_pushable): call to malloc() returned NULL. exiting...\n");
158 abort();
159 }
160 return new_pushable;
161}
162
163
164void lnm_pushable_push(lnm_pushable * pushable, lnmItem item) {
165 pushable->length++;
166 lnm_pushable_realloc(pushable);
167 pushable->frame[pushable->length - 1] = item;
168}
169
170
171void lnm_pushable_pop(lnm_pushable * pushable) {
172 pushable->length--;
173 lnm_pushable_realloc(pushable);
174}
175
176
177void lnm_pushable_remove(lnm_pushable * pushable, uint32_t index) {
178 if (index >= pushable->length) {
179 printf("lognestmonster (lnm_pushable_remove): attempt to remove index out of pushable bounds. exiting...\n");
180 abort();
181 }
182 if (index == pushable->length - 1) {
183 lnm_pushable_pop(pushable);
184 } else {
185 // shift entire array from index until end
186 for (uint32_t iter = index; iter < pushable->length - 1; iter++) {
187 pushable->frame[iter] = pushable->frame[iter + 1];
188 }
189 pushable->length--;
190 lnm_pushable_realloc(pushable);
191 }
192}
193
194
195void lnm_pushable_free(lnm_pushable * pushable) {
196 free(pushable->frame);
197 free(pushable);
198}
199
200
201// log event and log statement definitions
202
203
204typedef struct lnm_log_event {
205 // word 1, 1 byte data 7 bytes padding
206 uint8_t type:1; // used internally; 0 = statement, 1 = event
207 uint8_t pushed:1; // whether or not this log item has been pushed
208 uint8_t verbosity:3; // lnmVerbosityLevel, 0-5
209
210 // word 2, 8 bytes data
211 char * tag; // null-terminated tag string
212
213 // word 3, 8 bytes data
214 lnm_pushable * pushable; // pushable of lnmItems
215} lnm_log_event;
216
217
218typedef struct lnm_log_statement {
219 // word 1, 1 byte data 4 bytes padding
220 uint8_t type:1; // used internally; 0 = statement, 1 = event
221 uint8_t pushed:1; // whether or not this log item has been pushed
222 uint8_t verbosity:3; // lnmVerbosityLevel, 0-5
223
224 // word 2, 8 bytes data
225 uint64_t timestamp; // 64-bit millisecond timestamp
226
227 // word 3, 8 bytes data
228 char * log; // null-terminated message string
229} lnm_log_statement;
230
231
232// queue structure definition
233
234
235typedef struct lnm_queue {
236 char * name;
237 char * out_path;
238 uint64_t timestamp;
239 lnm_pushable * pushable;
240} lnm_queue;
241
242
243// time utilities
244
245
246#if defined(__unix__) || defined(unix) || defined(__unix) || defined(__CYGWIN__)
247#include <sys/time.h>
248static struct timeval lnm_current_time;
249#elif defined(_WIN32) || defined(__WINDOWS__)
250#include <sysinfoapi.h>
251static FILETIME lnm_win32_filetime;
252#else
253#error lognestmonster: Windows NT or a POSIX-compliant system were not detected. Implement your own system time functions or compile on a compliant system.
254#endif
255
256
257uint64_t lnm_getus(void) {
258 uint64_t us;
259#if defined(__unix__) || defined(unix) || defined(__unix) || defined(__CYGWIN__)
260 gettimeofday(&lnm_current_time, NULL);
261 us = (lnm_current_time.tv_sec*1000000+lnm_current_time.tv_usec);
262#elif defined(_WIN32) || defined(__WINDOWS__)
263 // get system time in ticks
264 GetSystemTimeAsFileTime(&lnm_win32_filetime);
265 // load time from two 32-bit words into one 64-bit integer
266 us = lnm_win32_filetime.dwHighDateTime << 32;
267 us |= lnm_win32_filetime.dwLowDateTime;
268 // convert to microseconds
269 us /= 10;
270 // convert from time since Windows NT epoch to time since Unix epoch
271 us -= 11644473600000000ULL;
272#endif
273 return us;
274}
275
276
277// item registry utils
278
279
280void lnm_free_item(lnmItem item);
281static lnm_pushable * lnm_registered_queues;
282static lnm_pushable * lnm_registered_items;
283static int lnm_registry_update_count;
284
285
286void lnm_registry_update(void) {
287 // iterate through registry
288 for (uint32_t iter = 0; iter < lnm_registered_items->length; iter++) {
289 lnm_log_statement * item = (lnm_log_statement *)(lnm_registered_items->frame[iter]);
290 // if the registered item has been pushed elsewhere, remove it from the top level of the registry
291 if (item->pushed) {
292 lnm_registry_update_count++;
293 lnm_pushable_remove(lnm_registered_items, iter);
294 iter--;
295 }
296 }
297}
298
299
300void lnm_registry_free() {
301 for (uint32_t iter = 0; iter < lnm_registered_items->length; iter++) {
302 lnm_free_item(lnm_registered_items->frame[iter]);
303 }
304}
305
306
307void lnm_registry_flush_item(lnmItem item) {
308 lnm_log_statement * item_cast = (lnm_log_statement *)item;
309 if (!item_cast->pushed) {
310 item_cast->pushed = 1;
311 lnm_registry_update();
312 }
313}
314
315
316// core library utilities
317
318
319int lnm_item_type(lnmItem item) {
320 return ((lnm_log_statement *)item)->type;
321}
322
323void lnm_free_item(lnmItem item) {
324 if (lnm_item_type(item) == LNM_STATEMENT) {
325 // cast item
326 lnm_log_statement * statement = (lnm_log_statement *)item;
327 // flush item out of registry
328 lnm_registry_flush_item(item);
329 // free item and its contents
330 free(statement->log);
331 free(statement);
332 } else if (lnm_item_type(item) == LNM_EVENT) {
333 // create breadcrumb navigation array with root 'item'
334 lnm_pushable * breadcrumb = lnm_new_pushable();
335 lnm_pushable_push(breadcrumb, item);
336 // continually iterate breadcrumb until it's empty
337 while (breadcrumb->length > 0) {
338 // get current item (deepest element of the breadcrumb nav, aka 'z' in 'x > y > z')
339 lnmItem current = breadcrumb->frame[breadcrumb->length - 1];
340 // flush item out of registry
341 lnm_registry_flush_item(current);
342 if (lnm_item_type(current) == LNM_STATEMENT) {
343 // cast current item
344 lnm_log_statement * current_statement = (lnm_log_statement *)current;
345 // free statement and its contents
346 free(current_statement->log);
347 free(current_statement);
348 // pop it from the breadcrumb nav
349 lnm_pushable_pop(breadcrumb);
350 // loop back
351 } else if (lnm_item_type(current) == LNM_EVENT) {
352 // cast current item
353 lnm_log_event * current_event = (lnm_log_event *)current;
354 if (current_event->pushable->length > 0) {
355 // the event has children
356 for (uint32_t iter = 0; iter < current_event->pushable->length; iter++) {
357 // add every child to the breadcrumb nav to free them
358 lnmItem current_event_child = current_event->pushable->frame[iter];
359 lnm_pushable_push(breadcrumb, current_event_child);
360 }
361 // set the current event as having no children so they're not erroneously counted twice
362 current_event->pushable->length = 0;
363 } else {
364 // the event is empty, so we can safely free it
365 lnm_pushable_free(current_event->pushable);
366 free(current_event->tag);
367 free(current_event);
368 // and remove from breadcrumb nav
369 lnm_pushable_pop(breadcrumb);
370 }
371 // loop back
372 } else {
373 printf("lognestmonster (lnm_free_item): item in log tree has non-statement and non-event type. exiting...\n");
374 abort();
375 }
376 }
377 } else {
378 printf("lognestmonster (lnm_free_item): log tree is non-statement and non-event type. exiting...\n");
379 abort();
380 }
381}
382
383
384// queue utilities
385
386
387void lnm_free_queue(lnmQueue queue) {
388 lnm_queue * queue_cast = (lnm_queue *)queue;
389 for (uint32_t iter = 0; iter < queue_cast->pushable->length; iter++) {
390 lnm_free_item(queue_cast->pushable->frame[iter]);
391 lnm_pushable_remove(queue_cast->pushable, iter);
392 iter--;
393 }
394}
395
396
397lnmQueue lnmQueueInit(char * name, char * out_path) {
398 // create queue and item registries if not created
399 if (lnm_registered_queues == NULL) {
400 lnm_registered_queues = lnm_new_pushable();
401 }
402 if (lnm_registered_items == NULL) {
403 lnm_registered_items = lnm_new_pushable();
404 }
405 // allocate and populate a new Queue object
406 lnm_queue * new_queue = malloc(sizeof(lnm_queue));
407 if (new_queue == NULL) {
408 printf("lognestmonster (lnmQueueInit): call to malloc() returned NULL. exiting...\n");
409 abort();
410 }
411 new_queue->name = malloc(strlen(name)+1);
412 new_queue->out_path = malloc(strlen(out_path)+1);
413 if (new_queue->name == NULL || new_queue->out_path == NULL) {
414 printf("lognestmonster (lnmQueueInit): call to malloc() returned NULL. exiting...\n");
415 abort();
416 }
417 strcpy(new_queue->name, name);
418 strcpy(new_queue->out_path, out_path);
419 new_queue->timestamp = lnm_getus();
420 new_queue->pushable = lnm_new_pushable();
421 // enter new Queue into registry
422 lnm_pushable_push(lnm_registered_queues, (lnmQueue)new_queue);
423 return (lnmQueue)new_queue;
424}
425
426
427lnmQueue lnmQueueByName(char * name) {
428 if (lnm_registered_queues == NULL) {
429 printf("lognestmonster (lnmQueueByName): queue registry is nonexistant. exiting...\n");
430 abort();
431 }
432 if (lnm_registered_queues->length == 0) {
433 printf("lognestmonster (lnmQueueByName): queue registry is empty. exiting...\n");
434 abort();
435 }
436 for (uint32_t iter = 0; iter<lnm_registered_queues->length; iter++) {
437 lnm_queue * queue = (lnm_queue *)lnm_registered_queues->frame[iter];
438 if (strcmp(queue->name, name) == 0) {
439 return (lnmQueue)queue;
440 }
441 }
442 printf("lognestmonster (lnmQueueByName): queue not found in registry. exiting...\n");
443 abort();
444}
445
446
447void lnmQueuePush(lnmQueue queue, lnmItem item) {
448 lnm_log_statement * statement = (lnm_log_statement *)item;
449 if (statement->pushed == 1) {
450 printf("lognestmonster (lnmQueuePush): attempt to push an already-pushed log item. exiting...\n");
451 abort();
452 }
453 // flush out of registry
454 statement->pushed = 1;
455 lnm_registry_update();
456 // add to queue
457 lnm_pushable_push(((lnm_queue *)queue)->pushable, item);
458}
459
460
461lnmItem lnmStatement(enum lnmVerbosityLevel verbosity, char * message) {
462 lnm_log_statement * new_statement = malloc(sizeof(lnm_log_statement));
463 if (new_statement == NULL) {
464 printf("lognestmonster (lnmStatement): call to malloc() returned NULL. exiting...\n");
465 abort();
466 }
467 new_statement->type = LNM_STATEMENT;
468 new_statement->verbosity = verbosity;
469 new_statement->timestamp = lnm_getus();
470 // enforce string lengths
471 int message_len = strlen(message);
472 if (message_len > 65536 || message_len < 0) {
473 printf("lognestmonster (lnmStatement): message length %i is longer than the cap 65536 characters. exiting...\n", message_len);
474 abort();
475 }
476 // copy message to new_statement->log
477 new_statement->log = malloc(message_len);
478 if (new_statement->log == NULL) {
479 printf("lognestmonster (lnmStatement): call to malloc() returned NULL. exiting...\n");
480 abort();
481 }
482 strcpy(new_statement->log, message);
483 // add to registry
484 lnm_pushable_push(lnm_registered_items, (lnmItem)new_statement);
485 return (lnmItem)new_statement;
486}
487
488
489lnmItem lnmEvent(char * tag) {
490 lnm_log_event * new_event = malloc(sizeof(lnm_log_event));
491 if (new_event == NULL) {
492 printf("lognestmonster (lnmEvent): call to malloc() returned NULL. exiting...\n");
493 abort();
494 }
495 new_event->type = LNM_EVENT;
496 new_event->pushable = lnm_new_pushable();
497 // copy tag to event
498 int tag_len = strlen(tag);
499 new_event->tag = malloc(tag_len + 1);
500 if (new_event->tag == NULL) {
501 printf("lognestmonster (lnmEvent): call to malloc() returned NULL. exiting...\n");
502 abort();
503 }
504 strcpy(new_event->tag, tag);
505 // add to registry
506 lnm_pushable_push(lnm_registered_items, (lnmItem)new_event);
507 return (lnmItem)new_event;
508}
509
510
511void lnmEventPush(lnmItem event, lnmItem item) {
512 if (event == item) {
513 printf("lognestmonster (lnmEventPush): attempt to push event to self. exiting...\n");
514 abort();
515 }
516 lnm_log_statement * item_cast = (lnm_log_statement *)item;
517 if (item_cast->pushed == 1) {
518 printf("lognestmonster (lnmEventPush): attempt to push an already-pushed log item. exiting...\n");
519 abort();
520 }
521 if (lnm_item_type(event) != LNM_EVENT) {
522 printf("lognestmonster (lnmEventPush): cannot cast non-event to event type. exiting...\n");
523 abort();
524 }
525 lnm_log_event * event_cast = (lnm_log_event *)event;
526 lnm_pushable_push(event_cast->pushable, item);
527 item_cast->pushed = 1;
528 lnm_registry_update();
529}
530
531
532void lnmEventPushS(lnmItem event, enum lnmVerbosityLevel verbosity, char * message) {
533 lnmItem statement = lnmStatement(verbosity, message);
534 lnmEventPush(event, statement);
535}
536
537
538lnmItem lnmEventI(char * tag, lnmItem item) {
539 lnmItem event = lnmEvent(tag);
540 lnmEventPush(event, item);
541 return event;
542}
543
544
545lnmItem lnmEventS(char * tag, enum lnmVerbosityLevel verbosity, char * message) {
546 lnmItem event = lnmEvent(tag);
547 lnmEventPushS(event, verbosity, message);
548 return event;
549}
550
551
552#ifdef LNM_DEBUG
553#include <inttypes.h>
554
555void lnm_debug_tabs(int tab_count) {
556 for (int i = 0; i < tab_count; i++) {
557 printf(" ");
558 }
559}
560
561
562void lnm_debug_parse_item(lnmItem item, int tab_count) {
563 if (lnm_item_type(item) == LNM_STATEMENT) {
564 lnm_log_statement * statement = (lnm_log_statement *) item;
565 lnm_debug_tabs(tab_count);
566
567 char * verbosity;
568 switch (statement->verbosity) {
569 case 0:
570 verbosity = "INFO";
571 break;
572 case 1:
573 verbosity = "DEBUG";
574 break;
575 case 2:
576 verbosity = "VERBOSE";
577 break;
578 case 3:
579 verbosity = "VERYVERBOSE";
580 break;
581 case 4:
582 verbosity = "WARNING";
583 break;
584 case 5:
585 verbosity = "ERROR";
586 break;
587 }
588
589 printf("%" PRIu64 " (%s) :: %s\n", statement->timestamp, verbosity, statement->log);
590 } else if (lnm_item_type(item) == LNM_EVENT) {
591 lnm_log_event * event = (lnm_log_event *) item;
592 lnm_debug_tabs(tab_count);
593 printf("Event (%" PRIu32 "/%" PRIu32 ") %s [\n", event->pushable->length, event->pushable->capacity, event->tag);
594 for (uint32_t iter = 0; iter < event->pushable->length; iter++) {
595 lnmItem item = event->pushable->frame[iter];
596 lnm_debug_parse_item(item, tab_count + 1);
597 }
598 lnm_debug_tabs(tab_count);
599 printf("]\n");
600 } else {
601 printf("lognestmonster (lnm_debug_parse_item): unknown item type. exiting...\n");
602 abort();
603 }
604}
605
606
607void lnm_debug_parse_registry(void) {
608 printf("Top level registry (%" PRIu32 "/%" PRIu32 ") [\n", lnm_registered_items->length, lnm_registered_items->capacity);
609 for (uint32_t iter = 0; iter < lnm_registered_items->length; iter++) {
610 lnm_debug_parse_item(lnm_registered_items->frame[iter], 1);
611 }
612 printf("]\n");
613}
614
615
616void lnm_debug_parse_queue(lnmQueue queue) {
617 lnm_queue * queue_cast = (lnm_queue *)queue;
618 printf("Queue \"%s\" at %s (%" PRIu32 "/%" PRIu32 ") [\n", queue_cast->name, queue_cast->out_path, queue_cast->pushable->length, queue_cast->pushable->capacity);
619 for (uint32_t iter = 0; iter < queue_cast->pushable->length; iter++) {
620 lnm_debug_parse_item((lnmItem)queue_cast->pushable->frame[iter], 1);
621 }
622 printf("]\n");
623}
624#endif // LNM_DEBUG
625#endif // LNM_INIT
626#endif // LOGNESTMONSTER_H
627
628
629#ifdef __cplusplus
630}
631#endif
632