summaryrefslogtreecommitdiffstats
path: root/src/H5Clog_json.c
blob: afb81c582cbc74c8a65327f1a87d471d848efedd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:     H5Clog_json.c
 *
 * Purpose:     Cache log implementation that emits JSON-formatted log
 *              entries for consumption by new-fangled data analysis tools.
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* Module Setup */
/****************/
#include "H5Cmodule.h" /* This source code file is part of the H5C module */

/***********/
/* Headers */
/***********/
#include "H5private.h"   /* Generic Functions                        */
#include "H5Cpkg.h"      /* Cache                                    */
#include "H5Clog.h"      /* Cache logging                            */
#include "H5Eprivate.h"  /* Error handling                           */
#include "H5MMprivate.h" /* Memory management                        */

/****************/
/* Local Macros */
/****************/

/* Max log message size */
#define H5C_MAX_JSON_LOG_MSG_SIZE 1024

/******************/
/* Local Typedefs */
/******************/

/********************/
/* Package Typedefs */
/********************/

typedef struct H5C_log_json_udata_t {
    FILE *outfile;
    char *message;
} H5C_log_json_udata_t;

/********************/
/* Local Prototypes */
/********************/

/* Internal message handling calls */
static herr_t H5C__json_write_log_message(H5C_log_json_udata_t *json_udata);

/* Log message callbacks */
static herr_t H5C__json_tear_down_logging(H5C_log_info_t *log_info);
static herr_t H5C__json_write_start_log_msg(void *udata);
static herr_t H5C__json_write_stop_log_msg(void *udata);
static herr_t H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value);
static herr_t H5C__json_write_destroy_cache_log_msg(void *udata);
static herr_t H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value);
static herr_t H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address, int type_id,
                                                    herr_t fxn_ret_value);
static herr_t H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value);
static herr_t H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags,
                                                   size_t size, herr_t fxn_ret_value);
static herr_t H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                       herr_t fxn_ret_value);
static herr_t H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                       herr_t fxn_ret_value);
static herr_t H5C__json_write_mark_unserialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                              herr_t fxn_ret_value);
static herr_t H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                            herr_t fxn_ret_value);
static herr_t H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id,
                                                 herr_t fxn_ret_value);
static herr_t H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                herr_t fxn_ret_value);
static herr_t H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
                                                const H5C_cache_entry_t *child, herr_t fxn_ret_value);
static herr_t H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id,
                                                    unsigned flags, herr_t fxn_ret_value);
static herr_t H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                   size_t new_size, herr_t fxn_ret_value);
static herr_t H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                  herr_t fxn_ret_value);
static herr_t H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
                                                 const H5C_cache_entry_t *child, herr_t fxn_ret_value);
static herr_t H5C__json_write_unprotect_entry_log_msg(void *udata, haddr_t address, int type_id,
                                                      unsigned flags, herr_t fxn_ret_value);
static herr_t H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config,
                                                       herr_t fxn_ret_value);
static herr_t H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                   herr_t fxn_ret_value);

/*********************/
/* Package Variables */
/*********************/

/*****************************/
/* Library Private Variables */
/*****************************/

/*******************/
/* Local Variables */
/*******************/

/* Note that there's no cache set up call since that's the
 * place where this struct is wired into the cache.
 */
static const H5C_log_class_t H5C_json_log_class_g = {"json",
                                                     H5C__json_tear_down_logging,
                                                     NULL, /* start logging */
                                                     NULL, /* stop logging */
                                                     H5C__json_write_start_log_msg,
                                                     H5C__json_write_stop_log_msg,
                                                     H5C__json_write_create_cache_log_msg,
                                                     H5C__json_write_destroy_cache_log_msg,
                                                     H5C__json_write_evict_cache_log_msg,
                                                     H5C__json_write_expunge_entry_log_msg,
                                                     H5C__json_write_flush_cache_log_msg,
                                                     H5C__json_write_insert_entry_log_msg,
                                                     H5C__json_write_mark_entry_dirty_log_msg,
                                                     H5C__json_write_mark_entry_clean_log_msg,
                                                     H5C__json_write_mark_unserialized_entry_log_msg,
                                                     H5C__json_write_mark_serialized_entry_log_msg,
                                                     H5C__json_write_move_entry_log_msg,
                                                     H5C__json_write_pin_entry_log_msg,
                                                     H5C__json_write_create_fd_log_msg,
                                                     H5C__json_write_protect_entry_log_msg,
                                                     H5C__json_write_resize_entry_log_msg,
                                                     H5C__json_write_unpin_entry_log_msg,
                                                     H5C__json_write_destroy_fd_log_msg,
                                                     H5C__json_write_unprotect_entry_log_msg,
                                                     H5C__json_write_set_cache_config_log_msg,
                                                     H5C__json_write_remove_entry_log_msg};

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_log_message
 *
 * Purpose:     Write a message to the log file and flush the file.
 *              The message string is neither modified nor freed.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_log_message(H5C_log_json_udata_t *json_udata)
{
    size_t n_chars;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->outfile);
    HDassert(json_udata->message);

    /* Write the log message and flush */
    n_chars = HDstrlen(json_udata->message);
    if ((int)n_chars != HDfprintf(json_udata->outfile, "%s", json_udata->message))
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "error writing log message")
    HDmemset((void *)(json_udata->message), 0, (size_t)(n_chars * sizeof(char)));

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_log_message() */

/*-------------------------------------------------------------------------
 * Function:    H5C__log_json_set_up
 *
 * Purpose:     Setup for metadata cache logging.
 *
 *              Metadata logging is enabled and disabled at two levels. This
 *              function and the associated tear_down function open and close
 *              the log file. the start_ and stop_logging functions are then
 *              used to switch logging on/off. Optionally, logging can begin
 *              as soon as the log file is opened (set via the start_immediately
 *              parameter to this function).
 *
 *              The log functionality is split between the H5C and H5AC
 *              packages. Log state and direct log manipulation resides in
 *              H5C. Log messages are generated in H5AC and sent to
 *              the H5C__json_write_log_message function.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__log_json_set_up(H5C_log_info_t *log_info, const char log_location[], int mpi_rank)
{
    H5C_log_json_udata_t *json_udata = NULL;
    char                 *file_name  = NULL;
    size_t                n_chars;
    herr_t                ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(log_info);
    HDassert(log_location);

    /* Set up the class struct */
    log_info->cls = &H5C_json_log_class_g;

    /* Allocate memory for the JSON-specific data */
    if (NULL == (log_info->udata = H5MM_calloc(sizeof(H5C_log_json_udata_t))))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
    json_udata = (H5C_log_json_udata_t *)(log_info->udata);

    /* Allocate memory for the message buffer */
    if (NULL == (json_udata->message = (char *)H5MM_calloc(H5C_MAX_JSON_LOG_MSG_SIZE * sizeof(char))))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")

    /* Possibly fix up the log file name.
     * The extra 39 characters are for adding the rank to the file name
     * under parallel HDF5. 39 characters allows > 2^127 processes which
     * should be enough for anybody.
     *
     * allocation size = "RANK_" + <rank # length> + dot + <path length> + \0
     */
    n_chars = 5 + 39 + 1 + HDstrlen(log_location) + 1;
    if (NULL == (file_name = (char *)H5MM_calloc(n_chars * sizeof(char))))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL,
                    "can't allocate memory for mdc log file name manipulation")

    /* Add the rank to the log file name when MPI is in use */
    if (-1 == mpi_rank)
        HDsnprintf(file_name, n_chars, "%s", log_location);
    else
        HDsnprintf(file_name, n_chars, "RANK_%d.%s", mpi_rank, log_location);

    /* Open log file and set it to be unbuffered */
    if (NULL == (json_udata->outfile = HDfopen(file_name, "w")))
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "can't create mdc log file")
    HDsetbuf(json_udata->outfile, NULL);

done:
    if (file_name)
        H5MM_xfree(file_name);

    /* Free and reset the log info struct on errors */
    if (FAIL == ret_value) {
        /* Free */
        if (json_udata && json_udata->message)
            H5MM_xfree(json_udata->message);
        if (json_udata)
            H5MM_xfree(json_udata);

        /* Reset */
        log_info->udata = NULL;
        log_info->cls   = NULL;
    }

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__log_json_set_up() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_tear_down_logging
 *
 * Purpose:     Tear-down for metadata cache logging.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_tear_down_logging(H5C_log_info_t *log_info)
{
    H5C_log_json_udata_t *json_udata = NULL;
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(log_info);

    /* Alias */
    json_udata = (H5C_log_json_udata_t *)(log_info->udata);

    /* Free the message buffer */
    H5MM_xfree(json_udata->message);

    /* Close log file */
    if (EOF == HDfclose(json_udata->outfile))
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "problem closing mdc log file")
    json_udata->outfile = NULL;

    /* Fre the udata */
    H5MM_xfree(json_udata);

    /* Reset the log class info and udata */
    log_info->cls   = NULL;
    log_info->udata = NULL;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_tear_down_logging() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_start_log_msg
 *
 * Purpose:     Write a log message when logging starts.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_start_log_msg(void *udata)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string (opens the JSON array) */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\n\
\"HDF5 metadata cache log messages\" : [\n\
{\
\"timestamp\":%lld,\
\"action\":\"logging start\"\
},\n\
",
               (long long)HDtime(NULL));

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_start_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_stop_log_msg
 *
 * Purpose:     Write a log message when logging ends.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_stop_log_msg(void *udata)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string (closes the JSON array) */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"logging stop\"\
}\n\
]}\n\
",
               (long long)HDtime(NULL));

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_stop_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_create_cache_log_msg
 *
 * Purpose:     Write a log message for cache creation.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"create\",\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_create_cache_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_destroy_cache_log_msg
 *
 * Purpose:     Write a log message for cache destruction.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_destroy_cache_log_msg(void *udata)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"destroy\"\
},\n\
",
               (long long)HDtime(NULL));

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_destroy_cache_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_evict_cache_log_msg
 *
 * Purpose:     Write a log message for eviction of cache entries.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"evict\",\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_evict_cache_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_expunge_entry_log_msg
 *
 * Purpose:     Write a log message for expunge of cache entries.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address, int type_id, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"expunge\",\
\"address\":0x%lx,\
\"type_id\":%d,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)address, (int)type_id, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_expunge_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_flush_cache_log_msg
 *
 * Purpose:     Write a log message for cache flushes.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"flush\",\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_flush_cache_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_insert_entry_log_msg
 *
 * Purpose:     Write a log message for insertion of cache entries.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags, size_t size,
                                     herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"insert\",\
\"address\":0x%lx,\
\"type_id\":%d,\
\"flags\":0x%x,\
\"size\":%d,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)address, type_id, flags, (int)size,
               (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_insert_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_mark_entry_dirty_log_msg
 *
 * Purpose:     Write a log message for marking cache entries as dirty.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"dirty\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_mark_entry_dirty_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_mark_entry_clean_log_msg
 *
 * Purpose:     Write a log message for marking cache entries as clean.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"clean\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_mark_entry_clean_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_mark_unserialized_entry_log_msg
 *
 * Purpose:     Write a log message for marking cache entries as unserialized.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_mark_unserialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                                herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"unserialized\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_mark_unserialized_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_mark_serialize_entry_log_msg
 *
 * Purpose:     Write a log message for marking cache entries as serialize.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
                                              herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"serialized\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_mark_serialized_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_move_entry_log_msg
 *
 * Purpose:     Write a log message for moving a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id,
                                   herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"move\",\
\"old_address\":0x%lx,\
\"new_address\":0x%lx,\
\"type_id\":%d,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)old_addr, (unsigned long)new_addr, type_id,
               (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_move_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_pin_entry_log_msg
 *
 * Purpose:     Write a log message for pinning a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"pin\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_pin_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_create_fd_log_msg
 *
 * Purpose:     Write a log message for creating a flush dependency between
 *              two cache entries.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
                                  const H5C_cache_entry_t *child, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(parent);
    HDassert(child);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"create_fd\",\
\"parent_addr\":0x%lx,\
\"child_addr\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)parent->addr, (unsigned long)child->addr,
               (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_create_fd_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_protect_entry_log_msg
 *
 * Purpose:     Write a log message for protecting a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id,
                                      unsigned flags, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    char                  rw_s[16];
    herr_t                ret_value = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    if (H5C__READ_ONLY_FLAG == flags)
        HDstrcpy(rw_s, "READ");
    else
        HDstrcpy(rw_s, "WRITE");

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"protect\",\
\"address\":0x%lx,\
\"type_id\":%d,\
\"readwrite\":\"%s\",\
\"size\":%d,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, type_id, rw_s, (int)entry->size,
               (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_protect_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_resize_entry_log_msg
 *
 * Purpose:     Write a log message for resizing a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, size_t new_size,
                                     herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"resize\",\
\"address\":0x%lx,\
\"new_size\":%d,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)new_size, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_resize_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_unpin_entry_log_msg
 *
 * Purpose:     Write a log message for unpinning a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"unpin\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_unpin_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_destroy_fd_log_msg
 *
 * Purpose:     Write a log message for destroying a flush dependency
 *              between two cache entries.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
                                   const H5C_cache_entry_t *child, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(parent);
    HDassert(child);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"destroy_fd\",\
\"parent_addr\":0x%lx,\
\"child_addr\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)parent->addr, (unsigned long)child->addr,
               (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_destroy_fd_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_unprotect_entry_log_msg
 *
 * Purpose:     Write a log message for unprotecting a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_unprotect_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags,
                                        herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"unprotect\",\
\"address\":0x%lx,\
\"id\":%d,\
\"flags\":%x,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)address, type_id, flags, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_unprotect_entry_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_set_cache_config_log_msg
 *
 * Purpose:     Write a log message for setting the cache configuration.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t H5_ATTR_NDEBUG_UNUSED *config,
                                         herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(config);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"set_config\",\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_set_cache_config_log_msg() */

/*-------------------------------------------------------------------------
 * Function:    H5C__json_write_remove_entry_log_msg
 *
 * Purpose:     Write a log message for removing a cache entry.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Dana Robinson
 *              Fall 2018
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
{
    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
    herr_t                ret_value  = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(json_udata);
    HDassert(json_udata->message);
    HDassert(entry);

    /* Create the log message string */
    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, "\
{\
\"timestamp\":%lld,\
\"action\":\"remove\",\
\"address\":0x%lx,\
\"returned\":%d\
},\n\
",
               (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);

    /* Write the log message to the file */
    if (H5C__json_write_log_message(json_udata) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__json_write_remove_entry_log_msg() */