forked from memcached/memcached
/
logger.c
1112 lines (981 loc) · 37.6 KB
/
logger.c
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
/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <poll.h>
#include <ctype.h>
#include <stdarg.h>
#if defined(__sun)
#include <atomic.h>
#endif
#include "memcached.h"
#include "bipbuffer.h"
#ifdef LOGGER_DEBUG
#define L_DEBUG(...) \
do { \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#else
#define L_DEBUG(...)
#endif
/* TODO: put this in a struct and ditch the global vars. */
static logger *logger_stack_head = NULL;
static logger *logger_stack_tail = NULL;
static unsigned int logger_count = 0;
static volatile int do_run_logger_thread = 1;
static pthread_t logger_tid;
pthread_mutex_t logger_stack_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t logger_stack_cond = PTHREAD_COND_INITIALIZER;
pthread_key_t logger_key;
#if !defined(HAVE_GCC_64ATOMICS) && !defined(__sun)
pthread_mutex_t logger_atomics_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#define WATCHER_LIMIT 20
logger_watcher *watchers[20];
struct pollfd watchers_pollfds[20];
int watcher_count = 0;
#define WATCHER_ALL -1
static int logger_thread_poll_watchers(int force_poll, int watcher);
/* helpers for logger_log */
static void _logger_log_text(logentry *e, const entry_details *d, const void *entry, va_list ap) {
int reqlen = d->reqlen;
int total = vsnprintf((char *) e->data, reqlen, d->format, ap);
if (total <= 0) {
fprintf(stderr, "LOGGER: Failed to vsnprintf a text entry: (total) %d\n", total);
}
e->size = total + 1; // null byte
}
static void _logger_log_evictions(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
struct logentry_eviction *le = (struct logentry_eviction *) e->data;
le->exptime = (it->exptime > 0) ? (long long int)(it->exptime - current_time) : (long long int) -1;
le->latime = current_time - it->time;
le->it_flags = it->it_flags;
le->nkey = it->nkey;
le->nbytes = it->nbytes;
le->clsid = ITEM_clsid(it);
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_eviction) + le->nkey;
}
#ifdef EXTSTORE
static void _logger_log_ext_write(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
int ew_bucket = va_arg(ap, int);
struct logentry_ext_write *le = (struct logentry_ext_write *) e->data;
le->exptime = (it->exptime > 0) ? (long long int)(it->exptime - current_time) : (long long int) -1;
le->latime = current_time - it->time;
le->it_flags = it->it_flags;
le->nkey = it->nkey;
le->clsid = ITEM_clsid(it);
le->bucket = (uint8_t)ew_bucket;
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_ext_write) + le->nkey;
}
#endif
// 0 == nf, 1 == found. 2 == flushed. 3 == expired.
// might be useful to store/print the flags an item has?
// could also collapse this and above code into an "item status" struct. wait
// for more endpoints to be written before making it generic, though.
static void _logger_log_item_get(logentry *e, const entry_details *d, const void *entry, va_list ap) {
int was_found = va_arg(ap, int);
char *key = va_arg(ap, char *);
int nkey = va_arg(ap, int);
int nbytes = va_arg(ap, int);
uint8_t clsid = va_arg(ap, int);
int sfd = va_arg(ap, int);
struct logentry_item_get *le = (struct logentry_item_get *) e->data;
le->was_found = was_found;
le->nkey = nkey;
le->nbytes = nbytes;
le->clsid = clsid;
memcpy(le->key, key, nkey);
le->sfd = sfd;
e->size = sizeof(struct logentry_item_get) + nkey;
}
static void _logger_log_item_store(logentry *e, const entry_details *d, const void *entry, va_list ap) {
enum store_item_type status = va_arg(ap, enum store_item_type);
int comm = va_arg(ap, int);
char *key = va_arg(ap, char *);
int nkey = va_arg(ap, int);
int nbytes = va_arg(ap, int);
rel_time_t ttl = va_arg(ap, rel_time_t);
uint8_t clsid = va_arg(ap, int);
int sfd = va_arg(ap, int);
struct logentry_item_store *le = (struct logentry_item_store *) e->data;
le->status = status;
le->cmd = comm;
le->nkey = nkey;
le->nbytes = nbytes;
le->clsid = clsid;
if (ttl != 0) {
le->ttl = ttl - current_time;
} else {
le->ttl = 0;
}
memcpy(le->key, key, nkey);
le->sfd = sfd;
e->size = sizeof(struct logentry_item_store) + nkey;
}
static void _logger_log_item_deleted(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
int comm = va_arg(ap, int);
struct logentry_deletion *le = (struct logentry_deletion *) e->data;
le->nkey = it->nkey;
le->cmd = comm;
le->nbytes = it->nbytes;
le->clsid = ITEM_clsid(it);
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_deletion) + le->nkey;
}
static void _logger_log_conn_event(logentry *e, const entry_details *d, const void *entry, va_list ap) {
struct sockaddr_in6 *addr = va_arg(ap, struct sockaddr_in6 *);
socklen_t addrlen = va_arg(ap, socklen_t);
enum network_transport transport = va_arg(ap, enum network_transport);
enum close_reasons reason = va_arg(ap, enum close_reasons);
int sfd = va_arg(ap, int);
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
memcpy(&le->addr, addr, addrlen);
le->sfd = sfd;
le->transport = transport;
le->reason = reason;
e->size = sizeof(struct logentry_conn_event);
}
/*************************
* Util functions used by the logger background thread
*************************/
static int _logger_util_addr_endpoint(struct sockaddr_in6 *addr, char *rip,
size_t riplen, unsigned short *rport) {
memset(rip, 0, riplen);
*rport = 0;
switch (addr->sin6_family) {
case AF_INET:
inet_ntop(AF_INET, &((struct sockaddr_in *) addr)->sin_addr,
rip, riplen - 1);
*rport = ntohs(((struct sockaddr_in *) addr)->sin_port);
break;
case AF_INET6:
inet_ntop(AF_INET6, &((struct sockaddr_in6 *) addr)->sin6_addr,
rip, riplen - 1);
*rport = ntohs(((struct sockaddr_in6 *) addr)->sin6_port);
break;
#ifndef DISABLE_UNIX_SOCKET
// Connections on Unix socket transports have c->request_addr zeroed out.
case AF_UNSPEC:
case AF_UNIX:
strncpy(rip, "unix", strlen("unix") + 1);
break;
#endif // #ifndef DISABLE_UNIX_SOCKET
}
return 0;
}
/*************************
* Logger background thread functions. Aggregates per-worker buffers and
* writes to any watchers.
*************************/
#define LOGGER_PARSE_SCRATCH 4096
static int _logger_parse_text(logentry *e, char *scratch) {
return snprintf(scratch, LOGGER_PARSE_SCRATCH, "ts=%lld.%d gid=%llu %s\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec,
(unsigned long long) e->gid, (char *) e->data);
}
static int _logger_parse_ise(logentry *e, char *scratch) {
int total;
const char *cmd = "na";
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_item_store *le = (struct logentry_item_store *) e->data;
const char * const status_map[] = {
"not_stored", "stored", "exists", "not_found", "too_large", "no_memory" };
const char * const cmd_map[] = {
"null", "add", "set", "replace", "append", "prepend", "cas", "append", "prepend" };
if (le->cmd <= 8)
cmd = cmd_map[le->cmd];
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=item_store key=%s status=%s cmd=%s ttl=%u clsid=%u cfd=%d size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, status_map[le->status], cmd, le->ttl, le->clsid, le->sfd,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ige(logentry *e, char *scratch) {
int total;
struct logentry_item_get *le = (struct logentry_item_get *) e->data;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
const char * const was_found_map[] = {
"not_found", "found", "flushed", "expired" };
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=item_get key=%s status=%s clsid=%u cfd=%d size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, was_found_map[le->was_found], le->clsid, le->sfd,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ee(logentry *e, char *scratch) {
int total;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_eviction *le = (struct logentry_eviction *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=eviction key=%s fetch=%s ttl=%lld la=%d clsid=%u size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, (le->it_flags & ITEM_FETCHED) ? "yes" : "no",
(long long int)le->exptime, le->latime, le->clsid,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ide(logentry *e, char *scratch) {
int total;
const char *cmd = "na";
const char * const cmd_map[] = {
"null", "delete", "md" };
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_deletion *le = (struct logentry_deletion *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
if (le->cmd <= 2)
cmd = cmd_map[le->cmd];
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%d.%d gid=%llu type=deleted key=%s cmd=%s clsid=%u size=%d\n",
(int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, cmd, le->clsid,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
#ifdef EXTSTORE
static int _logger_parse_extw(logentry *e, char *scratch) {
int total;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_ext_write *le = (struct logentry_ext_write *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=extwrite key=%s fetch=%s ttl=%lld la=%d clsid=%u bucket=%u\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, (le->it_flags & ITEM_FETCHED) ? "yes" : "no",
(long long int)le->exptime, le->latime, le->clsid, le->bucket);
return total;
}
#endif
static int _logger_parse_cne(logentry *e, char *scratch) {
int total;
unsigned short rport;
char rip[64];
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
const char * const transport_map[] = { "local", "tcp", "udp" };
_logger_util_addr_endpoint(&le->addr, rip, sizeof(rip), &rport);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=conn_new rip=%s rport=%hu transport=%s cfd=%d\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
rip, rport, transport_map[le->transport], le->sfd);
return total;
}
static int _logger_parse_cce(logentry *e, char *scratch) {
int total;
unsigned short rport;
char rip[64];
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
const char * const transport_map[] = { "local", "tcp", "udp" };
const char * const reason_map[] = { "error", "normal", "idle_timeout", "shutdown" };
_logger_util_addr_endpoint(&le->addr, rip, sizeof(rip), &rport);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=conn_close rip=%s rport=%hu transport=%s reason=%s cfd=%d\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
rip, rport, transport_map[le->transport],
reason_map[le->reason], le->sfd);
return total;
}
#ifdef PROXY
// TODO (v2): the length caps here are all magic numbers. Haven't thought of
// something yet that I like better.
// Should at least make a define to the max log len (1024) and do some math
// here.
static void _logger_log_proxy_req(logentry *e, const entry_details *d, const void *entry, va_list ap) {
char *req = va_arg(ap, char *);
int reqlen = va_arg(ap, uint32_t);
long elapsed = va_arg(ap, long);
unsigned short type = va_arg(ap, int);
unsigned short code = va_arg(ap, int);
int status = va_arg(ap, int);
char *detail = va_arg(ap, char *);
int dlen = va_arg(ap, int);
char *be_name = va_arg(ap, char *);
char *be_port = va_arg(ap, char *);
struct logentry_proxy_req *le = (void *)e->data;
le->type = type;
le->code = code;
le->status = status;
le->dlen = dlen;
le->elapsed = elapsed;
if (be_name && be_port) {
le->be_namelen = strlen(be_name);
le->be_portlen = strlen(be_port);
} else {
le->be_namelen = 0;
le->be_portlen = 0;
}
char *data = le->data;
if (req[reqlen-2] == '\r') {
reqlen -= 2;
} else {
reqlen--;
}
if (reqlen > 300) {
reqlen = 300;
}
if (dlen > 150) {
dlen = 150;
}
// be_namelen and be_portlen can't be longer than 255+6
le->reqlen = reqlen;
memcpy(data, req, reqlen);
data += reqlen;
memcpy(data, detail, dlen);
data += dlen;
memcpy(data, be_name, le->be_namelen);
data += le->be_namelen;
memcpy(data, be_port, le->be_portlen);
e->size = sizeof(struct logentry_proxy_req) + reqlen + dlen + le->be_namelen + le->be_portlen;
}
static int _logger_parse_prx_req(logentry *e, char *scratch) {
int total;
struct logentry_proxy_req *le = (void *)e->data;
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_req elapsed=%lu type=%d code=%d status=%d be=%.*s:%.*s detail=%.*s req=%.*s\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
le->elapsed, le->type, le->code, le->status,
(int)le->be_namelen, le->data+le->reqlen+le->dlen,
(int)le->be_portlen, le->data+le->reqlen+le->dlen+le->be_namelen, // fml.
(int)le->dlen, le->data+le->reqlen, (int)le->reqlen, le->data
);
return total;
}
#define MAX_RBUF_READ 100
static void _logger_log_proxy_errbe(logentry *e, const entry_details *d, const void *entry, va_list ap) {
char *errmsg = va_arg(ap, char *);
char *be_name = va_arg(ap, char *);
char *be_port = va_arg(ap, char *);
int be_depth = va_arg(ap, int);
char *be_rbuf = va_arg(ap, char *);
int be_rbuflen = va_arg(ap, int);
int be_retry = va_arg(ap, int);
struct logentry_proxy_errbe *le = (void *)e->data;
le->be_depth = be_depth;
le->retry = be_retry;
le->errlen = strlen(errmsg);
if (be_name && be_port) {
le->be_namelen = strlen(be_name);
le->be_portlen = strlen(be_port);
}
le->be_rbuflen = be_rbuflen;
if (be_rbuflen > MAX_RBUF_READ) {
le->be_rbuflen = MAX_RBUF_READ;
}
char *data = le->data;
memcpy(data, errmsg, le->errlen);
data += le->errlen;
memcpy(data, be_name, le->be_namelen);
data += le->be_namelen;
memcpy(data, be_port, le->be_portlen);
data += le->be_portlen;
memcpy(data, be_rbuf, le->be_rbuflen);
data += le->be_rbuflen;
e->size = sizeof(struct logentry_proxy_errbe) + (data - le->data);
}
static int _logger_parse_prx_errbe(logentry *e, char *scratch) {
int total;
char rbuf[MAX_RBUF_READ * 3]; // x 3 for worst case URI encoding.
struct logentry_proxy_errbe *le = (void *)e->data;
char *data = le->data;
char *errmsg = data;
data += le->errlen;
char *be_name = data;
data += le->be_namelen;
char *be_port = data;
data += le->be_portlen;
char *be_rbuf = data;
uriencode(be_rbuf, rbuf, le->be_rbuflen, MAX_RBUF_READ * 3);
if (le->retry) {
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_backend error=%.*s name=%.*s port=%.*s retry=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
(int)le->errlen, errmsg, (int)le->be_namelen, be_name,
(int)le->be_portlen, be_port, le->retry);
} else {
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_backend error=%.*s name=%.*s port=%.*s depth=%d rbuf=%s\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
(int)le->errlen, errmsg, (int)le->be_namelen, be_name,
(int)le->be_portlen, be_port, le->be_depth, rbuf);
}
return total;
}
#endif
/* Should this go somewhere else? */
static const entry_details default_entries[] = {
[LOGGER_ASCII_CMD] = {512, LOG_RAWCMDS, _logger_log_text, _logger_parse_text, "<%d %s"},
[LOGGER_EVICTION] = {512, LOG_EVICTIONS, _logger_log_evictions, _logger_parse_ee, NULL},
[LOGGER_ITEM_GET] = {512, LOG_FETCHERS, _logger_log_item_get, _logger_parse_ige, NULL},
[LOGGER_ITEM_STORE] = {512, LOG_MUTATIONS, _logger_log_item_store, _logger_parse_ise, NULL},
[LOGGER_CRAWLER_STATUS] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=lru_crawler crawler=%d lru=%s low_mark=%llu next_reclaims=%llu since_run=%u next_run=%d elapsed=%u examined=%llu reclaimed=%llu"
},
[LOGGER_SLAB_MOVE] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=slab_move src=%d dst=%d"
},
[LOGGER_CONNECTION_NEW] = {512, LOG_CONNEVENTS, _logger_log_conn_event, _logger_parse_cne, NULL},
[LOGGER_CONNECTION_CLOSE] = {512, LOG_CONNEVENTS, _logger_log_conn_event, _logger_parse_cce, NULL},
[LOGGER_DELETIONS] = {512, LOG_DELETIONS, _logger_log_item_deleted, _logger_parse_ide, NULL},
#ifdef EXTSTORE
[LOGGER_EXTSTORE_WRITE] = {512, LOG_EVICTIONS, _logger_log_ext_write, _logger_parse_extw, NULL},
[LOGGER_COMPACT_START] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_start id=%lu version=%llu"
},
[LOGGER_COMPACT_ABORT] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_abort id=%lu"
},
[LOGGER_COMPACT_READ_START] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_read_start id=%lu offset=%llu"
},
[LOGGER_COMPACT_READ_END] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_read_end id=%lu offset=%llu rescues=%lu lost=%lu skipped=%lu"
},
[LOGGER_COMPACT_END] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_end id=%lu"
},
[LOGGER_COMPACT_FRAGINFO] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_fraginfo ratio=%.2f bytes=%lu"
},
#endif
#ifdef PROXY
[LOGGER_PROXY_CONFIG] = {512, LOG_PROXYEVENTS, _logger_log_text, _logger_parse_text,
"type=proxy_conf status=%s"
},
[LOGGER_PROXY_REQ] = {1024, LOG_PROXYREQS, _logger_log_proxy_req, _logger_parse_prx_req, NULL},
[LOGGER_PROXY_ERROR] = {512, LOG_PROXYEVENTS, _logger_log_text, _logger_parse_text,
"type=proxy_error msg=%s"
},
[LOGGER_PROXY_USER] = {512, LOG_PROXYUSER, _logger_log_text, _logger_parse_text,
"type=proxy_user msg=%s"
},
[LOGGER_PROXY_BE_ERROR] = {512, LOG_PROXYEVENTS, _logger_log_proxy_errbe, _logger_parse_prx_errbe,
NULL
},
#endif
};
/*************************
* Util functions shared between bg thread and workers
*************************/
/* Logger GID's can be used by watchers to put logs back into strict order
*/
static uint64_t logger_gid = 0;
uint64_t logger_get_gid(void) {
#ifdef HAVE_GCC_64ATOMICS
return __sync_add_and_fetch(&logger_gid, 1);
#elif defined(__sun)
return atomic_inc_64_nv(&logger_gid);
#else
mutex_lock(&logger_atomics_mutex);
uint64_t res = ++logger_gid;
mutex_unlock(&logger_atomics_mutex);
return res;
#endif
}
void logger_set_gid(uint64_t gid) {
#ifdef HAVE_GCC_64ATOMICS
__sync_add_and_fetch(&logger_gid, gid);
#elif defined(__sun)
atomic_add_64(&logger_gid);
#else
mutex_lock(&logger_atomics_mutex);
logger_gid = gid;
mutex_unlock(&logger_atomics_mutex);
#endif
}
/* TODO: genericize lists. would be nice to import queue.h if the impact is
* studied... otherwise can just write a local one.
*/
/* Add to the list of threads with a logger object */
static void logger_link_q(logger *l) {
pthread_mutex_lock(&logger_stack_lock);
assert(l != logger_stack_head);
l->prev = 0;
l->next = logger_stack_head;
if (l->next) l->next->prev = l;
logger_stack_head = l;
if (logger_stack_tail == 0) logger_stack_tail = l;
logger_count++;
pthread_mutex_unlock(&logger_stack_lock);
return;
}
/* Remove from the list of threads with a logger object */
/*static void logger_unlink_q(logger *l) {
pthread_mutex_lock(&logger_stack_lock);
if (logger_stack_head == l) {
assert(l->prev == 0);
logger_stack_head = l->next;
}
if (logger_stack_tail == l) {
assert(l->next == 0);
logger_stack_tail = l->prev;
}
assert(l->next != l);
assert(l->prev != l);
if (l->next) l->next->prev = l->prev;
if (l->prev) l->prev->next = l->next;
logger_count--;
pthread_mutex_unlock(&logger_stack_lock);
return;
}*/
/* Called with logger stack locked.
* Iterates over every watcher collecting enabled flags.
*/
static void logger_set_flags(void) {
logger *l = NULL;
int x = 0;
uint16_t f = 0; /* logger eflags */
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL)
continue;
f |= w->eflags;
}
for (l = logger_stack_head; l != NULL; l=l->next) {
pthread_mutex_lock(&l->mutex);
l->eflags = f;
pthread_mutex_unlock(&l->mutex);
}
return;
}
/* Completes rendering of log line. */
static enum logger_parse_entry_ret logger_thread_parse_entry(logentry *e, struct logger_stats *ls,
char *scratch, int *scratch_len) {
int total = 0;
const entry_details *d = &default_entries[e->event];
assert(d->parse_cb != NULL);
total = d->parse_cb(e, scratch);
if (total >= LOGGER_PARSE_SCRATCH || total <= 0) {
L_DEBUG("LOGGER: Failed to flatten log entry!\n");
return LOGGER_PARSE_ENTRY_FAILED;
} else {
*scratch_len = total;
}
return LOGGER_PARSE_ENTRY_OK;
}
/* Writes flattened entry to available watchers */
static void logger_thread_write_entry(logentry *e, struct logger_stats *ls,
char *scratch, int scratch_len) {
int x, total;
/* Write the line into available watchers with matching flags */
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
char *skip_scr = NULL;
if (w == NULL || (e->eflags & w->eflags) == 0 || (e->gid < w->min_gid))
continue;
/* Avoid poll()'ing constantly when buffer is full by resetting a
* flag periodically.
*/
while (!w->failed_flush &&
(skip_scr = (char *) bipbuf_request(w->buf, scratch_len + 128)) == NULL) {
if (logger_thread_poll_watchers(0, x) <= 0) {
L_DEBUG("LOGGER: Watcher had no free space for line of size (%d)\n", scratch_len + 128);
w->failed_flush = true;
}
}
if (w->failed_flush) {
L_DEBUG("LOGGER: Fast skipped for watcher [%d] due to failed_flush\n", w->sfd);
w->skipped++;
ls->watcher_skipped++;
continue;
}
if (w->skipped > 0) {
total = snprintf(skip_scr, 128, "skipped=%llu\n", (unsigned long long) w->skipped);
if (total >= 128 || total <= 0) {
L_DEBUG("LOGGER: Failed to flatten skipped message into watcher [%d]\n", w->sfd);
w->skipped++;
ls->watcher_skipped++;
continue;
}
bipbuf_push(w->buf, total);
w->skipped = 0;
}
/* Can't fail because bipbuf_request succeeded. */
bipbuf_offer(w->buf, (unsigned char *) scratch, scratch_len);
ls->watcher_sent++;
}
}
/* Called with logger stack locked.
* Releases every chunk associated with a watcher and closes the connection.
* We can't presently send a connection back to the worker for further
* processing.
*/
static void logger_thread_close_watcher(logger_watcher *w) {
L_DEBUG("LOGGER: Closing dead watcher\n");
watchers[w->id] = NULL;
sidethread_conn_close(w->c);
watcher_count--;
bipbuf_free(w->buf);
free(w);
logger_set_flags();
}
/* Reads a particular worker thread's available bipbuf bytes. Parses each log
* entry into the watcher buffers.
*/
static int logger_thread_read(logger *l, struct logger_stats *ls) {
unsigned int size;
unsigned int pos = 0;
unsigned char *data;
char scratch[LOGGER_PARSE_SCRATCH];
logentry *e;
pthread_mutex_lock(&l->mutex);
data = bipbuf_peek_all(l->buf, &size);
pthread_mutex_unlock(&l->mutex);
if (data == NULL) {
return 0;
}
L_DEBUG("LOGGER: Got %d bytes from bipbuffer\n", size);
/* parse buffer */
while (pos < size && watcher_count > 0) {
enum logger_parse_entry_ret ret;
int scratch_len = 0;
e = (logentry *) (data + pos);
ret = logger_thread_parse_entry(e, ls, scratch, &scratch_len);
if (ret != LOGGER_PARSE_ENTRY_OK) {
/* TODO: stats counter */
fprintf(stderr, "LOGGER: Failed to parse log entry\n");
} else {
logger_thread_write_entry(e, ls, scratch, scratch_len);
}
pos += sizeof(logentry) + e->size + e->pad;
}
assert(pos <= size);
pthread_mutex_lock(&l->mutex);
data = bipbuf_poll(l->buf, size);
ls->worker_written += l->written;
ls->worker_dropped += l->dropped;
l->written = 0;
l->dropped = 0;
pthread_mutex_unlock(&l->mutex);
if (data == NULL) {
fprintf(stderr, "LOGGER: unexpectedly couldn't advance buf pointer\n");
assert(0);
}
return size; /* maybe the count of objects iterated? */
}
/* Since the event loop code isn't reusable without a refactor, and we have a
* limited number of potential watchers, we run our own poll loop.
* This calls poll() unnecessarily during write flushes, should be possible to
* micro-optimize later.
*
* This flushes buffers attached to watchers, iterating through the bytes set
* to each worker. Also checks for readability in case client connection was
* closed.
*
* Allows a specific watcher to be flushed (if buf full)
*/
static int logger_thread_poll_watchers(int force_poll, int watcher) {
int x;
int nfd = 0;
unsigned char *data;
unsigned int data_size = 0;
int flushed = 0;
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL || (watcher != WATCHER_ALL && x != watcher))
continue;
data = bipbuf_peek_all(w->buf, &data_size);
if (data != NULL) {
watchers_pollfds[nfd].fd = w->sfd;
watchers_pollfds[nfd].events = POLLOUT;
nfd++;
} else if (force_poll) {
watchers_pollfds[nfd].fd = w->sfd;
watchers_pollfds[nfd].events = POLLIN;
nfd++;
}
/* This gets set after a call to poll, and should be used to gate on
* calling poll again.
*/
w->failed_flush = false;
}
if (nfd == 0)
return 0;
//L_DEBUG("LOGGER: calling poll() [data_size: %d]\n", data_size);
int ret = poll(watchers_pollfds, nfd, 0);
if (ret < 0) {
perror("something failed with logger thread watcher fd polling");
return -1;
}
nfd = 0;
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL || (watcher != WATCHER_ALL && x != watcher))
continue;
data_size = 0;
/* Early detection of a disconnect. Otherwise we have to wait until
* the next write
*/
if (watchers_pollfds[nfd].revents & POLLIN) {
char buf[1];
int res = ((conn*)w->c)->read(w->c, buf, 1);
if (res == 0 || (res == -1 && (errno != EAGAIN && errno != EWOULDBLOCK))) {
L_DEBUG("LOGGER: watcher closed remotely\n");
logger_thread_close_watcher(w);
nfd++;
continue;
}
}
if ((data = bipbuf_peek_all(w->buf, &data_size)) != NULL) {
if (watchers_pollfds[nfd].revents & (POLLHUP|POLLERR)) {
L_DEBUG("LOGGER: watcher closed during poll() call\n");
logger_thread_close_watcher(w);
} else if (watchers_pollfds[nfd].revents & POLLOUT) {
int total = 0;
/* We can write a bit. */
switch (w->t) {
case LOGGER_WATCHER_STDERR:
total = fwrite(data, 1, data_size, stderr);
break;
case LOGGER_WATCHER_CLIENT:
total = ((conn*)w->c)->write(w->c, data, data_size);
break;
}
L_DEBUG("LOGGER: poll() wrote %d to %d (data_size: %d) (bipbuf_used: %d)\n", total, w->sfd,
data_size, bipbuf_used(w->buf));
if (total == -1) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
logger_thread_close_watcher(w);
}
L_DEBUG("LOGGER: watcher hit EAGAIN\n");
} else if (total == 0) {
logger_thread_close_watcher(w);
} else {
bipbuf_poll(w->buf, total);
flushed += total;
}
}
}
nfd++;
}
return flushed;
}
static void logger_thread_flush_stats(struct logger_stats *ls) {
STATS_LOCK();
stats.log_worker_dropped += ls->worker_dropped;
stats.log_worker_written += ls->worker_written;
stats.log_watcher_skipped += ls->watcher_skipped;
stats.log_watcher_sent += ls->watcher_sent;
stats_state.log_watchers = ls->watcher_count;
STATS_UNLOCK();
}
#define MAX_LOGGER_SLEEP 1000000
#define MIN_LOGGER_SLEEP 1000
/* Primary logger thread routine */
static void *logger_thread(void *arg) {
useconds_t to_sleep = MIN_LOGGER_SLEEP;
L_DEBUG("LOGGER: Starting logger thread\n");
// TODO: If we ever have item references in the logger code, will need to
// ensure everything is dequeued before stopping the thread.
while (do_run_logger_thread) {
int found_logs = 0;
logger *l;
struct logger_stats ls;
memset(&ls, 0, sizeof(struct logger_stats));
/* only sleep if we're *above* the minimum */
if (to_sleep > MIN_LOGGER_SLEEP)
usleep(to_sleep);
/* Call function to iterate each logger. */
pthread_mutex_lock(&logger_stack_lock);
if (watcher_count == 0) {
// Not bothering to loop on the condition here since it's fine to
// walk through with zero watchers.
pthread_cond_wait(&logger_stack_cond, &logger_stack_lock);
}
for (l = logger_stack_head; l != NULL; l=l->next) {
/* lock logger, call function to manipulate it */
found_logs += logger_thread_read(l, &ls);
}
logger_thread_poll_watchers(1, WATCHER_ALL);
/* capture the current count within mutual exclusion of the lock */
ls.watcher_count = watcher_count;
pthread_mutex_unlock(&logger_stack_lock);
/* TODO: abstract into a function and share with lru_crawler */
if (!found_logs) {
if (to_sleep < MAX_LOGGER_SLEEP)
to_sleep += to_sleep / 8;
if (to_sleep > MAX_LOGGER_SLEEP)
to_sleep = MAX_LOGGER_SLEEP;
} else {
to_sleep /= 2;
if (to_sleep < MIN_LOGGER_SLEEP)
to_sleep = MIN_LOGGER_SLEEP;
}
logger_thread_flush_stats(&ls);
}
return NULL;
}
static int start_logger_thread(void) {
int ret;
do_run_logger_thread = 1;
if ((ret = pthread_create(&logger_tid, NULL,
logger_thread, NULL)) != 0) {
fprintf(stderr, "Can't start logger thread: %s\n", strerror(ret));
return -1;
}
thread_setname(logger_tid, "mc-log");
return 0;
}
static int stop_logger_thread(void) {
// Guarantees that the logger thread is waiting on 'logger_stack_cond'
// before we signal it.
pthread_mutex_lock(&logger_stack_lock);
do_run_logger_thread = 0;
pthread_cond_signal(&logger_stack_cond);
pthread_mutex_unlock(&logger_stack_lock);
pthread_join(logger_tid, NULL);
return 0;
}
/*************************
* Public functions for submitting logs and starting loggers from workers.
*************************/
/* Global logger thread start/init */
void logger_init(void) {
/* TODO: auto destructor when threads exit */
/* TODO: error handling */
/* init stack for iterating loggers */
logger_stack_head = 0;
logger_stack_tail = 0;
pthread_key_create(&logger_key, NULL);
if (start_logger_thread() != 0) {
abort();
}
/* This is what adding a STDERR watcher looks like. should replace old
* "verbose" settings. */
//logger_add_watcher(NULL, 0);
return;
}
void logger_stop(void) {
stop_logger_thread();
}
/* called *from* the thread using a logger.
* initializes the per-thread bipbuf, links it into the list of loggers
*/
logger *logger_create(void) {
L_DEBUG("LOGGER: Creating and linking new logger instance\n");
logger *l = calloc(1, sizeof(logger));
if (l == NULL) {
return NULL;
}
l->buf = bipbuf_new(settings.logger_buf_size);
if (l->buf == NULL) {
free(l);
return NULL;
}
l->entry_map = default_entries;
pthread_mutex_init(&l->mutex, NULL);
pthread_setspecific(logger_key, l);
/* add to list of loggers */
logger_link_q(l);
return l;
}
/* Public function for logging an entry.