-
Notifications
You must be signed in to change notification settings - Fork 99
/
memcache_pool.c
1767 lines (1452 loc) · 47.5 KB
/
memcache_pool.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
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Antony Dovgal <tony2001@phpclub.net> |
| Mikael Johansson <mikael AT synd DOT info> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <zlib.h>
#ifdef PHP_WIN32
#include <winsock2.h>
#else
#include <arpa/inet.h>
#endif
#include "php.h"
#include "php_network.h"
#include "ext/standard/crc32.h"
#include "ext/standard/php_var.h"
#include "ext/standard/php_string.h"
#include "ext/standard/php_smart_string.h"
#include "zend_smart_str.h"
#include "memcache_pool.h"
ZEND_DECLARE_MODULE_GLOBALS(memcache)
#if PHP_VERSION_ID >= 80000
#define mmc_string_concat2 zend_string_concat2
#else
static zend_string* mmc_string_concat2(
const char *str1, size_t str1_len,
const char *str2, size_t str2_len)
{
size_t len = str1_len + str2_len;
zend_string *res = zend_string_alloc(len, 0);
memcpy(ZSTR_VAL(res), str1, str1_len);
memcpy(ZSTR_VAL(res) + str1_len, str2, str2_len);
ZSTR_VAL(res)[len] = '\0';
return res;
}
#endif
MMC_POOL_INLINE void mmc_buffer_alloc(mmc_buffer_t *buffer, unsigned int size) /*
ensures space for an additional size bytes {{{ */
{
#if PHP_VERSION_ID < 70200
register size_t newlen;
#endif
smart_string_alloc((&(buffer->value)), size, 0);
}
/* }}} */
MMC_POOL_INLINE void mmc_buffer_free(mmc_buffer_t *buffer) /* {{{ */
{
if (buffer->value.c != NULL) {
smart_string_free(&(buffer->value));
}
ZEND_SECURE_ZERO(buffer, sizeof(*buffer));
}
/* }}} */
static unsigned int mmc_hash_crc32_init() { return ~0; }
static unsigned int mmc_hash_crc32_finish(unsigned int seed) { return ~seed; }
static unsigned int mmc_hash_crc32_combine(unsigned int seed, const void *key, unsigned int key_len) /*
CRC32 hash {{{ */
{
const char *p = (const char *)key, *end = p + key_len;
while (p < end) {
CRC32(seed, *(p++));
}
return seed;
}
/* }}} */
mmc_hash_function_t mmc_hash_crc32 = {
mmc_hash_crc32_init,
mmc_hash_crc32_combine,
mmc_hash_crc32_finish
};
static unsigned int mmc_hash_fnv1a_combine(unsigned int seed, const void *key, unsigned int key_len) /*
FNV-1a hash {{{ */
{
const char *p = (const char *)key, *end = p + key_len;
while (p < end) {
seed ^= (unsigned int)*(p++);
seed *= FNV_32_PRIME;
}
return seed;
}
/* }}} */
static unsigned int mmc_hash_fnv1a_init() { return FNV_32_INIT; }
static unsigned int mmc_hash_fnv1a_finish(unsigned int seed) { return seed; }
mmc_hash_function_t mmc_hash_fnv1a = {
mmc_hash_fnv1a_init,
mmc_hash_fnv1a_combine,
mmc_hash_fnv1a_finish
};
double timeval_to_double(struct timeval tv) {
return (double)tv.tv_sec + ((double)tv.tv_usec) / 1000000;
}
struct timeval double_to_timeval(double sec) {
struct timeval tv;
tv.tv_sec = (long)sec;
tv.tv_usec = (sec - tv.tv_sec) * 1000000;
return tv;
}
static size_t mmc_stream_read_buffered(mmc_stream_t *io, char *buf, size_t count) /*
attempts to reads count bytes from the stream buffer {{{ */
{
size_t toread = io->buffer.value.len - io->buffer.idx < count ? io->buffer.value.len - io->buffer.idx : count;
memcpy(buf, io->buffer.value.c + io->buffer.idx, toread);
io->buffer.idx += toread;
return toread;
}
/* }}} */
static char *mmc_stream_readline_buffered(mmc_stream_t *io, char *buf, size_t maxlen, size_t *retlen) /*
reads count bytes from the stream buffer, this implementation only detects \r\n (like memcached sends) {{{ */
{
char *eol;
eol = memchr(io->buffer.value.c + io->buffer.idx, '\n', io->buffer.value.len - io->buffer.idx);
if (eol != NULL) {
*retlen = eol - io->buffer.value.c - io->buffer.idx + 1;
}
else {
*retlen = io->buffer.value.len - io->buffer.idx;
}
/* ensure space for data + \0 */
if (*retlen >= maxlen) {
*retlen = maxlen - 1;
}
memcpy(buf, io->buffer.value.c + io->buffer.idx, *retlen);
io->buffer.idx += *retlen;
buf[*retlen] = '\0';
return buf;
}
/* }}} */
static size_t mmc_stream_read_wrapper(mmc_stream_t *io, char *buf, size_t count) /* {{{ */
{
return php_stream_read(io->stream, buf, count);
}
/* }}} */
static char *mmc_stream_readline_wrapper(mmc_stream_t *io, char *buf, size_t maxlen, size_t *retlen) /* {{{ */
{
return php_stream_get_line(io->stream, buf, maxlen, retlen);
}
/* }}} */
void mmc_request_reset(mmc_request_t *request) /* {{{ */
{
request->key_len = 0;
mmc_buffer_reset(&(request->sendbuf));
mmc_queue_reset(&(request->failed_servers));
request->failed_index = 0;
}
/* }}} */
void mmc_request_free(mmc_request_t *request) /* {{{ */
{
mmc_buffer_free(&(request->sendbuf));
mmc_buffer_free(&(request->readbuf));
mmc_queue_free(&(request->failed_servers));
efree(request);
}
/* }}} */
static inline int mmc_request_send(mmc_t *mmc, mmc_request_t *request) /* {{{ */
{
int count, bytes;
/* send next chunk of buffer */
count = request->sendbuf.value.len - request->sendbuf.idx;
if (count > request->io->stream->chunk_size) {
count = request->io->stream->chunk_size;
}
bytes = send(request->io->fd, request->sendbuf.value.c + request->sendbuf.idx, count, MSG_NOSIGNAL);
if (bytes >= 0) {
request->sendbuf.idx += bytes;
/* done sending? */
if (request->sendbuf.idx >= request->sendbuf.value.len) {
return MMC_REQUEST_DONE;
}
return MMC_REQUEST_MORE;
}
else {
char *message, buf[1024];
long err = php_socket_errno();
if (err == EAGAIN) {
return MMC_REQUEST_MORE;
}
message = php_socket_strerror(err, buf, 1024);
return mmc_server_failure(mmc, request->io, message, err);
}
}
/* }}} */
static int mmc_request_read_udp(mmc_t *mmc, mmc_request_t *request) /*
reads an entire datagram into buffer and validates the udp header {{{ */
{
size_t bytes;
mmc_udp_header_t *header;
uint16_t reqid, seqid;
/* reset buffer if completely consumed */
if (request->io->buffer.idx >= request->io->buffer.value.len) {
mmc_buffer_reset(&(request->io->buffer));
}
/* attempt to read datagram + sentinel-byte */
mmc_buffer_alloc(&(request->io->buffer), MMC_MAX_UDP_LEN + 1);
bytes = php_stream_read(request->io->stream, request->io->buffer.value.c + request->io->buffer.value.len, MMC_MAX_UDP_LEN + 1);
if (bytes < sizeof(mmc_udp_header_t)) {
return mmc_server_failure(mmc, request->io, "Failed te read complete UDP header from stream", 0);
}
if (bytes > MMC_MAX_UDP_LEN) {
return mmc_server_failure(mmc, request->io, "Server sent packet larger than MMC_MAX_UDP_LEN bytes", 0);
}
header = (mmc_udp_header_t *)(request->io->buffer.value.c + request->io->buffer.value.len);
reqid = ntohs(header->reqid);
seqid = ntohs(header->seqid);
/* initialize udp header fields */
if (!request->udp.total && request->udp.reqid == reqid) {
request->udp.seqid = seqid;
request->udp.total = ntohs(header->total);
}
/* detect dropped packets and reschedule for tcp delivery */
if (request->udp.reqid != reqid || request->udp.seqid != seqid) {
/* ensure that no more udp requests are scheduled for a while */
request->io->status = MMC_STATUS_FAILED;
request->io->failed = (long)time(NULL);
/* discard packets for previous requests */
if (reqid < request->udp.reqid) {
return MMC_REQUEST_MORE;
}
php_error_docref(NULL, E_NOTICE, "UDP packet loss, expected reqid/seqid %d/%d got %d/%d",
(int)request->udp.reqid, (int)request->udp.seqid, (int)reqid, (int)seqid);
return MMC_REQUEST_RETRY;
}
request->udp.seqid++;
/* skip udp header */
if (request->io->buffer.idx > 0) {
memmove(
request->io->buffer.value.c + request->io->buffer.value.len,
request->io->buffer.value.c + request->io->buffer.value.len + sizeof(mmc_udp_header_t),
bytes - sizeof(mmc_udp_header_t));
}
else {
request->io->buffer.idx += sizeof(mmc_udp_header_t);
}
request->io->buffer.value.len += bytes;
return MMC_OK;
}
/* }}} */
static void mmc_compress(mmc_pool_t *pool, mmc_buffer_t *buffer, const char *value, int value_len, unsigned int *flags, int copy) /* {{{ */
{
/* autocompress large values */
if (pool->compress_threshold && value_len >= pool->compress_threshold) {
*flags |= MMC_COMPRESSED;
}
if (*flags & MMC_COMPRESSED) {
int status;
mmc_buffer_t prev;
unsigned long result_len = value_len * (1 - pool->min_compress_savings);
if (copy) {
/* value is already in output buffer */
prev = *buffer;
/* allocate space for prev header + result */
ZEND_SECURE_ZERO(buffer, sizeof(*buffer));
mmc_buffer_alloc(buffer, prev.value.len + result_len);
/* append prev header */
smart_string_appendl(&(buffer->value), prev.value.c, prev.value.len - value_len);
buffer->idx = prev.idx;
}
else {
/* allocate space directly in buffer */
mmc_buffer_alloc(buffer, result_len);
}
if (MMC_COMPRESSION_LEVEL >= 0) {
status = compress2((unsigned char *)buffer->value.c + buffer->value.len, &result_len, (unsigned const char *)value, value_len, MMC_COMPRESSION_LEVEL);
} else {
status = compress((unsigned char *)buffer->value.c + buffer->value.len, &result_len, (unsigned const char *)value, value_len);
}
if (status == Z_OK) {
buffer->value.len += result_len;
}
else {
smart_string_appendl(&(buffer->value), value, value_len);
*flags &= ~MMC_COMPRESSED;
}
if (copy) {
mmc_buffer_free(&prev);
}
}
else if (!copy) {
smart_string_appendl(&(buffer->value), value, value_len);
}
}
/* }}}*/
static int mmc_uncompress(const char *data, unsigned long data_len, char **result, unsigned long *result_len) /* {{{ */
{
int status, factor = 1;
do {
*result_len = data_len * (1 << factor++);
*result = (char *)erealloc(*result, *result_len + 1);
status = uncompress((unsigned char *)*result, result_len, (unsigned const char *)data, data_len);
} while (status == Z_BUF_ERROR && factor < 16);
if (status == Z_OK) {
return MMC_OK;
}
efree(*result);
return MMC_REQUEST_FAILURE;
}
/* }}}*/
int mmc_pack_value(mmc_pool_t *pool, mmc_buffer_t *buffer, zval *value, unsigned int *flags) /*
does serialization and compression to pack a zval into the buffer {{{ */
{
if (*flags & 0xffff & ~MMC_COMPRESSED) {
php_error_docref(NULL, E_WARNING, "The lowest two bytes of the flags array is reserved for pecl/memcache internal use");
return MMC_REQUEST_FAILURE;
}
*flags &= ~MMC_SERIALIZED;
switch (Z_TYPE_P(value)) {
case IS_STRING:
*flags |= MMC_TYPE_STRING;
mmc_compress(pool, buffer, Z_STRVAL_P(value), Z_STRLEN_P(value), flags, 0);
break;
case IS_LONG:
*flags |= MMC_TYPE_LONG;
*flags &= ~MMC_COMPRESSED;
smart_string_append_long(&(buffer->value), Z_LVAL_P(value));
break;
case IS_DOUBLE: {
char buf[256];
int len = snprintf(buf, 256, "%.14g", Z_DVAL_P(value));
*flags |= MMC_TYPE_DOUBLE;
*flags &= ~MMC_COMPRESSED;
smart_string_appendl(&(buffer->value), buf, len);
break;
}
case IS_TRUE:
case IS_FALSE:
*flags |= MMC_TYPE_BOOL;
*flags &= ~MMC_COMPRESSED;
smart_string_appendc(&(buffer->value), Z_TYPE_P(value) == IS_TRUE ? '1' : '0');
break;
default: {
php_serialize_data_t value_hash;
zval value_copy, *value_copy_ptr;
size_t prev_len = buffer->value.len;
smart_str buf = {0};
/* FIXME: we should be using 'Z' instead of this, but unfortunately it's PHP5-only */
value_copy = *value;
zval_copy_ctor(&value_copy);
value_copy_ptr = &value_copy;
PHP_VAR_SERIALIZE_INIT(value_hash);
php_var_serialize(&buf, value_copy_ptr, &value_hash);
PHP_VAR_SERIALIZE_DESTROY(value_hash);
if (!buf.s) {
zval_dtor(&value_copy);
php_error_docref(NULL, E_WARNING, "Failed to serialize value");
return MMC_REQUEST_FAILURE;
}
smart_string_appendl(&(buffer->value), ZSTR_VAL(buf.s), ZSTR_LEN(buf.s));
smart_str_free(&buf);
/* trying to save null or something went really wrong */
if (buffer->value.c == NULL || buffer->value.len == prev_len) {
zval_dtor(&value_copy);
php_error_docref(NULL, E_WARNING, "Failed to serialize value");
return MMC_REQUEST_FAILURE;
}
*flags |= MMC_SERIALIZED;
zval_dtor(&value_copy);
mmc_compress(pool, buffer, buffer->value.c + prev_len, buffer->value.len - prev_len, flags, 1);
}
}
return MMC_OK;
}
/* }}} */
int mmc_unpack_value(
mmc_t *mmc, mmc_request_t *request, mmc_buffer_t *buffer, const char *key, unsigned int key_len,
unsigned int flags, unsigned long cas, unsigned int bytes) /*
does uncompression and unserializing to reconstruct a zval {{{ */
{
char *data = NULL;
unsigned long data_len;
zval object;
if (flags & MMC_COMPRESSED) {
if (mmc_uncompress(buffer->value.c, bytes, &data, &data_len) != MMC_OK) {
php_error_docref(NULL, E_NOTICE, "Failed to uncompress data");
return MMC_REQUEST_DONE;
}
}
else {
data = buffer->value.c;
data_len = bytes;
}
if (flags & MMC_SERIALIZED) {
php_unserialize_data_t var_hash;
const unsigned char *p = (unsigned char *)data;
char key_tmp[MMC_MAX_KEY_LEN + 1];
mmc_request_value_handler value_handler;
void *value_handler_param;
mmc_buffer_t buffer_tmp;
/* make copies of data to ensure re-entrancy */
memcpy(key_tmp, key, key_len + 1);
value_handler = request->value_handler;
value_handler_param = request->value_handler_param;
if (!(flags & MMC_COMPRESSED)) {
buffer_tmp = *buffer;
mmc_buffer_release(buffer);
}
PHP_VAR_UNSERIALIZE_INIT(var_hash);
if (!php_var_unserialize(&object, &p, p + data_len, &var_hash)) {
PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
if (flags & MMC_COMPRESSED) {
efree(data);
}
else if (buffer->value.c == NULL) {
*buffer = buffer_tmp;
}
else {
mmc_buffer_free(&buffer_tmp);
}
php_error_docref(NULL, E_NOTICE, "Failed to unserialize data");
return MMC_REQUEST_DONE;
}
PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
if (flags & MMC_COMPRESSED) {
efree(data);
}
else if (buffer->value.c == NULL) {
*buffer = buffer_tmp;
}
else {
mmc_buffer_free(&buffer_tmp);
}
/* delegate to value handler */
return value_handler(key_tmp, key_len, &object, flags, cas, value_handler_param);
}
else {
switch (flags & 0x0f00) {
case MMC_TYPE_LONG: {
long val;
data[data_len] = '\0';
val = strtol(data, NULL, 10);
ZVAL_LONG(&object, val);
break;
}
case MMC_TYPE_DOUBLE: {
double val = 0;
data[data_len] = '\0';
sscanf(data, "%lg", &val);
ZVAL_DOUBLE(&object, val);
break;
}
case MMC_TYPE_BOOL:
ZVAL_BOOL(&object, data_len == 1 && data[0] == '1');
break;
default:
data[data_len] = '\0';
ZVAL_STRINGL(&object, data, data_len);
efree(data);
if (!(flags & MMC_COMPRESSED)) {
/* release buffer because it's now owned by the zval */
mmc_buffer_release(buffer);
}
}
/* delegate to value handler */
return request->value_handler(key, key_len, &object, flags, cas, request->value_handler_param);
}
}
/* }}}*/
mmc_t *mmc_server_new(
const char *host, int host_len, unsigned short tcp_port, unsigned short udp_port,
int persistent, double timeout, int retry_interval) /* {{{ */
{
mmc_t *mmc = pemalloc(sizeof(mmc_t), persistent);
ZEND_SECURE_ZERO(mmc, sizeof(*mmc));
mmc->host = pemalloc(host_len + 1, persistent);
memcpy(mmc->host, host, host_len);
mmc->host[host_len] = '\0';
mmc->tcp.port = tcp_port;
mmc->tcp.status = MMC_STATUS_DISCONNECTED;
mmc->udp.port = udp_port;
mmc->udp.status = MMC_STATUS_DISCONNECTED;
mmc->persistent = persistent;
mmc->timeout = double_to_timeval(timeout);
mmc->tcp.retry_interval = retry_interval;
mmc->tcp.chunk_size = MEMCACHE_G(chunk_size);
mmc->udp.retry_interval = retry_interval;
mmc->udp.chunk_size = MEMCACHE_G(chunk_size); /* = MMC_MAX_UDP_LEN;*/
return mmc;
}
/* }}} */
static void _mmc_server_disconnect(mmc_t *mmc, mmc_stream_t *io, int close_persistent_stream) /* {{{ */
{
mmc_buffer_free(&(io->buffer));
if (io->stream != NULL) {
if (mmc->persistent) {
if (close_persistent_stream) {
php_stream_pclose(io->stream);
}
}
else {
php_stream_close(io->stream);
}
io->stream = NULL;
io->fd = 0;
}
io->status = MMC_STATUS_DISCONNECTED;
}
/* }}} */
void mmc_server_disconnect(mmc_t *mmc, mmc_stream_t *io) /* {{{ */
{
_mmc_server_disconnect(mmc, io, 1);
}
/* }}} */
static void mmc_server_seterror(mmc_t *mmc, const char *error, int errnum) /* {{{ */
{
if (error != NULL) {
if (mmc->error != NULL) {
efree(mmc->error);
}
mmc->error = estrdup(error);
mmc->errnum = errnum;
}
}
/* }}} */
static void mmc_server_deactivate(mmc_pool_t *pool, mmc_t *mmc) /*
disconnect and marks the server as down, failovers all queued requests {{{ */
{
mmc_queue_t readqueue;
mmc_request_t *request;
mmc_server_disconnect(mmc, &(mmc->tcp));
mmc_server_disconnect(mmc, &(mmc->udp));
mmc->tcp.status = MMC_STATUS_FAILED;
mmc->udp.status = MMC_STATUS_FAILED;
mmc->tcp.failed = (long)time(NULL);
mmc->udp.failed = mmc->tcp.failed;
mmc_queue_remove(pool->sending, mmc);
mmc_queue_remove(pool->reading, mmc);
/* failover queued requests, sendque can be ignored since
* readque + readreq + buildreq will always contain all active requests */
mmc_queue_reset(&(mmc->sendqueue));
mmc->sendreq = NULL;
readqueue = mmc->readqueue;
mmc_queue_release(&(mmc->readqueue));
if (mmc->readreq != NULL) {
mmc_queue_push(&readqueue, mmc->readreq);
mmc->readreq = NULL;
}
if (mmc->buildreq != NULL) {
mmc_queue_push(&readqueue, mmc->buildreq);
mmc->buildreq = NULL;
}
/* delegate to failover handlers */
while ((request = mmc_queue_pop(&readqueue)) != NULL) {
request->failover_handler(pool, mmc, request, request->failover_handler_param);
}
mmc_queue_free(&readqueue);
/* fire userspace failure event */
if (pool->failure_callback != NULL) {
pool->failure_callback(pool, mmc, &pool->failure_callback_param);
}
}
/* }}} */
int mmc_server_failure(mmc_t *mmc, mmc_stream_t *io, const char *error, int errnum) /*
determines if a request should be retried or is a hard network failure {{{ */
{
switch (io->status) {
case MMC_STATUS_DISCONNECTED:
return MMC_REQUEST_RETRY;
/* attempt reconnect of sockets in unknown state */
case MMC_STATUS_UNKNOWN:
io->status = MMC_STATUS_DISCONNECTED;
return MMC_REQUEST_RETRY;
}
mmc_server_seterror(mmc, error, errnum);
return MMC_REQUEST_FAILURE;
}
/* }}} */
int mmc_request_failure(mmc_t *mmc, mmc_stream_t *io, const char *message, unsigned int message_len, int errnum) /*
checks for a valid server generated error message and calls mmc_server_failure() {{{ */
{
if (message_len) {
return mmc_server_failure(mmc, io, message, errnum);
}
return mmc_server_failure(mmc, io, "Malformed server response", errnum);
}
/* }}} */
static int mmc_server_connect(mmc_pool_t *pool, mmc_t *mmc, mmc_stream_t *io, int udp) /*
connects a stream, calls mmc_server_deactivate() on failure {{{ */
{
char *host, *hash_key = NULL;
zend_string *errstr = NULL;
int host_len, errnum = 0;
struct timeval tv = mmc->timeout;
int fd;
/* close open stream */
if (io->stream != NULL) {
mmc_server_disconnect(mmc, io);
}
if (mmc->persistent) {
spprintf(&hash_key, 0, "memcache:stream:%s:%u:%d", mmc->host, io->port, udp);
}
if (udp) {
host_len = spprintf(&host, 0, "udp://%s:%u", mmc->host, io->port);
}
else if (io->port) {
host_len = spprintf(&host, 0, "%s:%u", mmc->host, io->port);
}
else {
host_len = spprintf(&host, 0, "%s", mmc->host);
}
io->stream = php_stream_xport_create(
host, host_len,
REPORT_ERRORS | (mmc->persistent ? STREAM_OPEN_PERSISTENT : 0),
STREAM_XPORT_CLIENT | STREAM_XPORT_CONNECT,
hash_key, &tv, NULL, &errstr, &errnum);
efree(host);
if (hash_key != NULL) {
efree(hash_key);
}
/* check connection and extract socket for select() purposes */
if (!io->stream || php_stream_cast(io->stream, PHP_STREAM_AS_FD_FOR_SELECT, (void **)&fd, 1) != SUCCESS) {
if (errstr != NULL) {
zend_string* error = mmc_string_concat2(
"Connection failed: ", sizeof("Connection failed: ") - 1,
ZSTR_VAL(errstr), ZSTR_LEN(errstr));
mmc_server_seterror(mmc, ZSTR_VAL(error), errnum);
zend_string_release(error);
} else {
mmc_server_seterror(mmc, "Connection failed", errnum);
}
mmc_server_deactivate(pool, mmc);
if (errstr != NULL) {
efree(errstr);
}
return MMC_REQUEST_FAILURE;
}
php_stream_auto_cleanup(io->stream);
php_stream_set_chunk_size(io->stream, io->chunk_size);
php_stream_set_option(io->stream, PHP_STREAM_OPTION_BLOCKING, 0, NULL);
php_stream_set_option(io->stream, PHP_STREAM_OPTION_READ_TIMEOUT, 0, &(mmc->timeout));
/* doing our own buffering increases performance */
php_stream_set_option(io->stream, PHP_STREAM_OPTION_READ_BUFFER, PHP_STREAM_BUFFER_NONE, NULL);
php_stream_set_option(io->stream, PHP_STREAM_OPTION_WRITE_BUFFER, PHP_STREAM_BUFFER_NONE, NULL);
io->fd = fd;
io->status = MMC_STATUS_CONNECTED;
/* php_stream buffering prevent us from detecting datagram boundaries when using udp */
if (udp) {
io->read = mmc_stream_read_buffered;
io->readline = mmc_stream_readline_buffered;
}
else {
io->read = mmc_stream_read_wrapper;
io->readline = mmc_stream_readline_wrapper;
}
#ifdef SO_NOSIGPIPE
/* Mac OS X doesn't have MSG_NOSIGNAL */
{
int optval = 1;
setsockopt(io->fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&optval, sizeof(optval));
}
#endif
if (mmc->error != NULL) {
efree(mmc->error);
mmc->error = NULL;
}
return MMC_OK;
}
/* }}} */
int mmc_server_valid(mmc_t *mmc) /*
checks if a server should be considered valid to serve requests {{{ */
{
if (mmc != NULL) {
if (mmc->tcp.status >= MMC_STATUS_DISCONNECTED) {
return 1;
}
if (mmc->tcp.status == MMC_STATUS_FAILED &&
mmc->tcp.retry_interval >= 0 && (long)time(NULL) >= mmc->tcp.failed + mmc->tcp.retry_interval) {
return 1;
}
}
return 0;
}
/* }}} */
void mmc_server_sleep(mmc_t *mmc) /*
prepare server struct for persistent sleep {{{ */
{
mmc_buffer_free(&(mmc->tcp.buffer));
mmc_buffer_free(&(mmc->udp.buffer));
mmc->sendreq = NULL;
mmc->readreq = NULL;
mmc->buildreq = NULL;
mmc_queue_free(&(mmc->sendqueue));
mmc_queue_free(&(mmc->readqueue));
if (mmc->error != NULL) {
efree(mmc->error);
mmc->error = NULL;
}
}
/* }}} */
void mmc_server_free(mmc_t *mmc) /* {{{ */
{
mmc_server_sleep(mmc);
_mmc_server_disconnect(mmc, &(mmc->tcp), 0);
_mmc_server_disconnect(mmc, &(mmc->udp), 0);
pefree(mmc->host, mmc->persistent);
pefree(mmc, mmc->persistent);
}
/* }}} */
static void mmc_pool_init_hash(mmc_pool_t *pool) /* {{{ */
{
mmc_hash_function_t *hash;
switch (MEMCACHE_G(hash_strategy)) {
case MMC_CONSISTENT_HASH:
pool->hash = &mmc_consistent_hash;
break;
default:
pool->hash = &mmc_standard_hash;
}
switch (MEMCACHE_G(hash_function)) {
case MMC_HASH_FNV1A:
hash = &mmc_hash_fnv1a;
break;
default:
hash = &mmc_hash_crc32;
}
pool->hash_state = pool->hash->create_state(hash);
}
/* }}} */
mmc_pool_t *mmc_pool_new() /* {{{ */
{
mmc_pool_t *pool = emalloc(sizeof(mmc_pool_t));
ZEND_SECURE_ZERO(pool, sizeof(*pool));
switch (MEMCACHE_G(protocol)) {
case MMC_BINARY_PROTOCOL:
pool->protocol = &mmc_binary_protocol;
break;
default:
pool->protocol = &mmc_ascii_protocol;
}
mmc_pool_init_hash(pool);
pool->compress_threshold = MEMCACHE_G(compress_threshold);
pool->min_compress_savings = MMC_DEFAULT_SAVINGS;
pool->sending = &(pool->_sending1);
pool->reading = &(pool->_reading1);
return pool;
}
/* }}} */
void mmc_pool_free(mmc_pool_t *pool) /* {{{ */
{
int i;
mmc_request_t *request;
for (i=0; i<pool->num_servers; i++) {
if (pool->servers[i] != NULL) {
if (pool->servers[i]->persistent) {
mmc_server_sleep(pool->servers[i]);
} else {
mmc_server_free(pool->servers[i]);
}
pool->servers[i] = NULL;
}
}
if (pool->num_servers) {
efree(pool->servers);
}
pool->hash->free_state(pool->hash_state);
mmc_queue_free(&(pool->_sending1));
mmc_queue_free(&(pool->_sending2));
mmc_queue_free(&(pool->_reading1));
mmc_queue_free(&(pool->_reading2));
mmc_queue_free(&(pool->pending));
/* requests are owned by us so free them */
while ((request = mmc_queue_pop(&(pool->free_requests))) != NULL) {
pool->protocol->free_request(request);
}
mmc_queue_free(&(pool->free_requests));
efree(pool);
}
/* }}} */
void mmc_pool_add(mmc_pool_t *pool, mmc_t *mmc, unsigned int weight) /*
adds a server to the pool and hash strategy {{{ */
{
pool->hash->add_server(pool->hash_state, mmc, weight);
pool->servers = erealloc(pool->servers, sizeof(*pool->servers) * (pool->num_servers + 1));
pool->servers[pool->num_servers] = mmc;
/* store the smallest timeout for any server */
if (!pool->num_servers || timeval_to_double(mmc->timeout) < timeval_to_double(pool->timeout)) {
pool->timeout = mmc->timeout;
}
pool->num_servers++;
}
/* }}} */
void mmc_pool_close(mmc_pool_t *pool) /*
disconnects and removes all servers in the pool {{{ */
{
if (pool->num_servers) {
int i;
for (i=0; i<pool->num_servers; i++) {
if (pool->servers[i]->persistent) {
mmc_server_sleep(pool->servers[i]);
} else {
mmc_server_free(pool->servers[i]);
}
}
efree(pool->servers);
pool->servers = NULL;
pool->num_servers = 0;
/* reallocate the hash strategy state */
pool->hash->free_state(pool->hash_state);
mmc_pool_init_hash(pool);
}
}
/* }}} */
int mmc_pool_open(mmc_pool_t *pool, mmc_t *mmc, mmc_stream_t *io, int udp) /*
connects if the stream is not already connected {{{ */
{
switch (io->status) {
case MMC_STATUS_CONNECTED:
case MMC_STATUS_UNKNOWN:
return MMC_OK;
case MMC_STATUS_DISCONNECTED:
case MMC_STATUS_FAILED:
return mmc_server_connect(pool, mmc, io, udp);