summaryrefslogtreecommitdiffstats
path: root/xlators/mgmt/glusterd/src/glusterd-peer-utils.c
blob: 7097439b9ff3a12c172ea8d582c066b02178eb30 (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
/*
   Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/

#include "glusterd-peer-utils.h"
#include "glusterd-store.h"
#include "glusterd-server-quorum.h"
#include "glusterd-messages.h"
#include <glusterfs/common-utils.h>
#include "glusterd-utils.h"

void
glusterd_peerinfo_destroy(struct rcu_head *head)
{
    int32_t ret = -1;
    glusterd_peerinfo_t *peerinfo = NULL;
    glusterd_peer_hostname_t *hostname = NULL;
    glusterd_peer_hostname_t *tmp = NULL;

    /* This works as rcu_head is the first member of gd_rcu_head */
    peerinfo = caa_container_of((gd_rcu_head *)head, glusterd_peerinfo_t,
                                rcu_head);

    /* Set THIS to the saved this. Needed by some functions below */
    THIS = peerinfo->rcu_head.this;

    CDS_INIT_LIST_HEAD(&peerinfo->uuid_list);

    ret = glusterd_store_delete_peerinfo(peerinfo);
    if (ret) {
        gf_msg("glusterd", GF_LOG_ERROR, errno, GD_MSG_PEERINFO_DELETE_FAIL,
               "Deleting peer info failed");
    }

    GF_FREE(peerinfo->hostname);
    peerinfo->hostname = NULL;

    cds_list_for_each_entry_safe(hostname, tmp, &peerinfo->hostnames,
                                 hostname_list)
    {
        glusterd_peer_hostname_free(hostname);
    }

    glusterd_sm_tr_log_delete(&peerinfo->sm_log);
    pthread_mutex_unlock(&peerinfo->delete_lock);
    pthread_mutex_destroy(&peerinfo->delete_lock);
    GF_FREE(peerinfo);

    peerinfo = NULL;

    return;
}

int32_t
glusterd_peerinfo_cleanup(glusterd_peerinfo_t *peerinfo)
{
    GF_ASSERT(peerinfo);
    gf_boolean_t quorum_action = _gf_false;
    glusterd_conf_t *priv = THIS->private;

    if (pthread_mutex_trylock(&peerinfo->delete_lock)) {
        /* Someone else is already deleting the peer, so give up */
        return 0;
    }

    if (peerinfo->quorum_contrib != QUORUM_NONE)
        quorum_action = _gf_true;
    if (peerinfo->rpc) {
        peerinfo->rpc = glusterd_rpc_clnt_unref(priv, peerinfo->rpc);
        peerinfo->rpc = NULL;
    }

    cds_list_del_rcu(&peerinfo->uuid_list);
    /* Saving THIS, as it is needed by the callback function */
    peerinfo->rcu_head.this = THIS;
    call_rcu(&peerinfo->rcu_head.head, glusterd_peerinfo_destroy);

    if (quorum_action)
        glusterd_do_quorum_action();
    return 0;
}

/* glusterd_peerinfo_find_by_hostname searches for a peer which matches the
 * hostname @hoststr and if found returns the pointer to peerinfo object.
 * Returns NULL otherwise.
 *
 * It first attempts a quick search by string matching @hoststr. If that fails,
 * it'll attempt a more thorough match by resolving the addresses and matching
 * the resolved addrinfos.
 */
glusterd_peerinfo_t *
glusterd_peerinfo_find_by_hostname(const char *hoststr)
{
    int ret = -1;
    struct addrinfo *addr = NULL;
    struct addrinfo *p = NULL;
    xlator_t *this = NULL;
    glusterd_peerinfo_t *peerinfo = NULL;

    this = THIS;
    GF_ASSERT(hoststr);

    peerinfo = NULL;

    peerinfo = gd_peerinfo_find_from_hostname(hoststr);
    if (peerinfo)
        return peerinfo;

    ret = getaddrinfo(hoststr, NULL, NULL, &addr);
    if (ret != 0) {
        gf_msg(this->name, GF_LOG_ERROR, ret, GD_MSG_GETADDRINFO_FAIL,
               "error in getaddrinfo: %s\n", gai_strerror(ret));
        goto out;
    }

    for (p = addr; p != NULL; p = p->ai_next) {
        peerinfo = gd_peerinfo_find_from_addrinfo(p);
        if (peerinfo) {
            freeaddrinfo(addr);
            return peerinfo;
        }
    }

out:
    gf_msg_debug(this->name, 0, "Unable to find friend: %s", hoststr);
    if (addr)
        freeaddrinfo(addr);
    return NULL;
}

int
glusterd_hostname_to_uuid(char *hostname, uuid_t uuid)
{
    GF_ASSERT(hostname);
    GF_ASSERT(uuid);

    glusterd_peerinfo_t *peerinfo = NULL;
    glusterd_conf_t *priv = NULL;
    int ret = -1;
    xlator_t *this = NULL;

    this = THIS;
    GF_ASSERT(this);
    priv = this->private;
    GF_ASSERT(priv);

    peerinfo = glusterd_peerinfo_find_by_hostname(hostname);
    if (peerinfo) {
        ret = 0;
        gf_uuid_copy(uuid, peerinfo->uuid);
    } else {
        if (gf_is_local_addr(hostname)) {
            gf_uuid_copy(uuid, MY_UUID);
            ret = 0;
        } else {
            ret = -1;
        }
    }

    gf_msg_debug(this->name, 0, "returning %d", ret);
    return ret;
}

/* glusterd_peerinfo_find_by_uuid searches for a peer which matches the
 * uuid @uuid and if found returns the pointer to peerinfo object.
 * Returns NULL otherwise.
 */
glusterd_peerinfo_t *
glusterd_peerinfo_find_by_uuid(uuid_t uuid)
{
    glusterd_conf_t *priv = NULL;
    glusterd_peerinfo_t *entry = NULL;
    glusterd_peerinfo_t *found = NULL;
    xlator_t *this = NULL;

    this = THIS;
    GF_ASSERT(this);

    priv = this->private;

    GF_ASSERT(priv);

    if (gf_uuid_is_null(uuid))
        return NULL;

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(entry, &priv->peers, uuid_list)
    {
        if (!gf_uuid_compare(entry->uuid, uuid)) {
            gf_msg_debug(this->name, 0, "Friend found... state: %s",
                         glusterd_friend_sm_state_name_get(entry->state.state));
            found = entry; /* Probably should be rcu_dereferenced */
            break;
        }
    }
    RCU_READ_UNLOCK;

    if (!found)
        gf_msg_debug(this->name, 0, "Friend with uuid: %s, not found",
                     uuid_utoa(uuid));
    return found;
}

/* glusterd_peerinfo_find will search for a peer matching either @uuid or
 * @hostname and return a pointer to the peerinfo object
 * Returns NULL otherwise.
 */
glusterd_peerinfo_t *
glusterd_peerinfo_find(uuid_t uuid, const char *hostname)
{
    glusterd_peerinfo_t *peerinfo = NULL;
    xlator_t *this = NULL;

    this = THIS;
    GF_ASSERT(this);

    if (uuid) {
        peerinfo = glusterd_peerinfo_find_by_uuid(uuid);

        if (peerinfo) {
            return peerinfo;
        } else {
            gf_msg_debug(this->name, 0, "Unable to find peer by uuid: %s",
                         uuid_utoa(uuid));
        }
    }

    if (hostname) {
        peerinfo = glusterd_peerinfo_find_by_hostname(hostname);

        if (peerinfo) {
            return peerinfo;
        } else {
            gf_msg_debug(this->name, 0, "Unable to find hostname: %s",
                         hostname);
        }
    }
    return NULL;
}

/* glusterd_peerinfo_new will create a new peerinfo object and set it's members
 * values using the passed parameters.
 * @hostname is added as the first entry in peerinfo->hostnames list and also
 * set to peerinfo->hostname.
 * It returns a pointer to peerinfo object if successful and returns NULL
 * otherwise. The caller should take care of freeing the created peerinfo
 * object.
 */
glusterd_peerinfo_t *
glusterd_peerinfo_new(glusterd_friend_sm_state_t state, uuid_t *uuid,
                      const char *hostname, int port)
{
    glusterd_peerinfo_t *new_peer = NULL;
    int ret = -1;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;

    this = THIS;
    GF_ASSERT(this);
    conf = this->private;
    GF_ASSERT(conf);

    new_peer = GF_CALLOC(1, sizeof(*new_peer), gf_gld_mt_peerinfo_t);
    if (!new_peer)
        goto out;

    CDS_INIT_LIST_HEAD(&new_peer->uuid_list);

    new_peer->state.state = state;

    CDS_INIT_LIST_HEAD(&new_peer->hostnames);
    if (hostname) {
        ret = gd_add_address_to_peer(new_peer, hostname);
        if (ret)
            goto out;
        /* Also set it to peerinfo->hostname. Doing this as we use
         * peerinfo->hostname in a lot of places and is really hard to
         * get everything right
         */
        new_peer->hostname = gf_strdup(hostname);
    }

    if (uuid) {
        gf_uuid_copy(new_peer->uuid, *uuid);
    }

    ret = glusterd_sm_tr_log_init(
        &new_peer->sm_log, glusterd_friend_sm_state_name_get,
        glusterd_friend_sm_event_name_get, GLUSTERD_TR_LOG_SIZE);
    if (ret)
        goto out;

    if (new_peer->state.state == GD_FRIEND_STATE_BEFRIENDED)
        new_peer->quorum_contrib = QUORUM_WAITING;
    new_peer->port = port;

    pthread_mutex_init(&new_peer->delete_lock, NULL);

    new_peer->generation = uatomic_add_return(&conf->generation, 1);
out:
    if (ret && new_peer) {
        glusterd_peerinfo_cleanup(new_peer);
        new_peer = NULL;
    }
    return new_peer;
}

/* Check if the all peers are connected and befriended, except the peer
 * specified (the peer being detached)
 */
gf_boolean_t
glusterd_chk_peers_connected_befriended(uuid_t skip_uuid)
{
    gf_boolean_t ret = _gf_true;
    glusterd_peerinfo_t *peerinfo = NULL;
    glusterd_conf_t *priv = NULL;

    priv = THIS->private;
    GF_ASSERT(priv);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(peerinfo, &priv->peers, uuid_list)
    {
        if (!gf_uuid_is_null(skip_uuid) &&
            !gf_uuid_compare(skip_uuid, peerinfo->uuid))
            continue;

        if ((GD_FRIEND_STATE_BEFRIENDED != peerinfo->state.state) ||
            !(peerinfo->connected)) {
            ret = _gf_false;
            break;
        }
    }
    RCU_READ_UNLOCK;

    gf_msg_debug(THIS->name, 0, "Returning %s", (ret ? "TRUE" : "FALSE"));
    return ret;
}

/* Return hostname for given uuid if it exists
 * else return NULL
 */
char *
glusterd_uuid_to_hostname(uuid_t uuid)
{
    char *hostname = NULL;
    glusterd_conf_t *priv = NULL;
    glusterd_peerinfo_t *entry = NULL;

    priv = THIS->private;
    GF_ASSERT(priv);

    if (!gf_uuid_compare(MY_UUID, uuid)) {
        hostname = gf_strdup("localhost");
    }
    RCU_READ_LOCK;
    if (!cds_list_empty(&priv->peers)) {
        cds_list_for_each_entry_rcu(entry, &priv->peers, uuid_list)
        {
            if (!gf_uuid_compare(entry->uuid, uuid)) {
                hostname = gf_strdup(entry->hostname);
                break;
            }
        }
    }
    RCU_READ_UNLOCK;

    return hostname;
}

char *
gd_peer_uuid_str(glusterd_peerinfo_t *peerinfo)
{
    if ((peerinfo == NULL) || gf_uuid_is_null(peerinfo->uuid))
        return NULL;

    if (peerinfo->uuid_str[0] == '\0')
        uuid_utoa_r(peerinfo->uuid, peerinfo->uuid_str);

    return peerinfo->uuid_str;
}

gf_boolean_t
glusterd_are_all_peers_up()
{
    glusterd_peerinfo_t *peerinfo = NULL;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    gf_boolean_t peers_up = _gf_false;

    this = THIS;
    GF_VALIDATE_OR_GOTO("glusterd", this, out);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, conf, out);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(peerinfo, &conf->peers, uuid_list)
    {
        if (!peerinfo->connected) {
            RCU_READ_UNLOCK;
            goto out;
        }
    }
    RCU_READ_UNLOCK;

    peers_up = _gf_true;

out:
    return peers_up;
}

gf_boolean_t
glusterd_are_vol_all_peers_up(glusterd_volinfo_t *volinfo,
                              struct cds_list_head *peers, char **down_peerstr)
{
    glusterd_peerinfo_t *peerinfo = NULL;
    glusterd_brickinfo_t *brickinfo = NULL;
    gf_boolean_t ret = _gf_false;

    cds_list_for_each_entry(brickinfo, &volinfo->bricks, brick_list)
    {
        if (!gf_uuid_compare(brickinfo->uuid, MY_UUID))
            continue;

        RCU_READ_LOCK;
        cds_list_for_each_entry_rcu(peerinfo, peers, uuid_list)
        {
            if (gf_uuid_compare(peerinfo->uuid, brickinfo->uuid))
                continue;

            /*Found peer who owns the brick, return false
             * if peer is not connected or not friend */
            if (!(peerinfo->connected) ||
                (peerinfo->state.state != GD_FRIEND_STATE_BEFRIENDED)) {
                *down_peerstr = gf_strdup(peerinfo->hostname);
                gf_msg_debug(THIS->name, 0, "Peer %s is down. ",
                             peerinfo->hostname);
                RCU_READ_UNLOCK;
                goto out;
            }
        }
        RCU_READ_UNLOCK;
    }

    ret = _gf_true;
out:
    gf_msg_debug("glusterd", 0, "Returning %d", ret);
    return ret;
}

int32_t
glusterd_peer_hostname_new(const char *hostname,
                           glusterd_peer_hostname_t **name)
{
    glusterd_peer_hostname_t *peer_hostname = NULL;
    int32_t ret = -1;

    GF_ASSERT(hostname);
    GF_ASSERT(name);

    peer_hostname = GF_CALLOC(1, sizeof(*peer_hostname),
                              gf_gld_mt_peer_hostname_t);

    if (!peer_hostname)
        goto out;

    peer_hostname->hostname = gf_strdup(hostname);
    CDS_INIT_LIST_HEAD(&peer_hostname->hostname_list);

    *name = peer_hostname;
    ret = 0;

out:
    gf_msg_debug("glusterd", 0, "Returning %d", ret);
    return ret;
}

void
glusterd_peer_hostname_free(glusterd_peer_hostname_t *name)
{
    if (!name)
        return;

    cds_list_del_init(&name->hostname_list);

    GF_FREE(name->hostname);
    name->hostname = NULL;

    GF_FREE(name);

    return;
}

gf_boolean_t
gd_peer_has_address(glusterd_peerinfo_t *peerinfo, const char *address)
{
    gf_boolean_t ret = _gf_false;
    glusterd_peer_hostname_t *hostname = NULL;

    GF_VALIDATE_OR_GOTO("glusterd", (peerinfo != NULL), out);
    GF_VALIDATE_OR_GOTO("glusterd", (address != NULL), out);

    cds_list_for_each_entry(hostname, &peerinfo->hostnames, hostname_list)
    {
        if (strcmp(hostname->hostname, address) == 0) {
            ret = _gf_true;
            break;
        }
    }

out:
    return ret;
}

int
gd_add_address_to_peer(glusterd_peerinfo_t *peerinfo, const char *address)
{
    int ret = -1;
    glusterd_peer_hostname_t *hostname = NULL;

    GF_VALIDATE_OR_GOTO("glusterd", (peerinfo != NULL), out);
    GF_VALIDATE_OR_GOTO("glusterd", (address != NULL), out);

    if (gd_peer_has_address(peerinfo, address)) {
        ret = 0;
        goto out;
    }

    ret = glusterd_peer_hostname_new(address, &hostname);
    if (ret)
        goto out;

    cds_list_add_tail_rcu(&hostname->hostname_list, &peerinfo->hostnames);

    ret = 0;
out:
    return ret;
}

/* gd_add_friend_to_dict() adds details of @friend into @dict with the given
 * @prefix. All the parameters are compulsory.
 *
 * The complete address list is added to the dict only if the cluster op-version
 * is >= GD_OP_VERSION_3_6_0
 */
int
gd_add_friend_to_dict(glusterd_peerinfo_t *friend, dict_t *dict,
                      const char *prefix)
{
    int ret = -1;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    char key[100] = {
        0,
    };
    glusterd_peer_hostname_t *address = NULL;
    int count = 0;

    this = THIS;
    GF_VALIDATE_OR_GOTO("glusterd", (this != NULL), out);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (conf != NULL), out);

    GF_VALIDATE_OR_GOTO(this->name, (friend != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (dict != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (prefix != NULL), out);

    snprintf(key, sizeof(key), "%s.uuid", prefix);
    ret = dict_set_dynstr_with_alloc(dict, key, uuid_utoa(friend->uuid));
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_SET_FAILED,
               "Failed to set key %s in dict", key);
        goto out;
    }

    /* Setting the first hostname from the list with this key for backward
     * compatibility
     */
    snprintf(key, sizeof(key), "%s.hostname", prefix);
    address = cds_list_entry(&friend->hostnames, glusterd_peer_hostname_t,
                             hostname_list);
    ret = dict_set_dynstr_with_alloc(dict, key, address->hostname);
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_SET_FAILED,
               "Failed to set key %s in dict", key);
        goto out;
    }

    if (conf->op_version < GD_OP_VERSION_3_6_0) {
        ret = 0;
        goto out;
    }

    address = NULL;
    count = 0;
    cds_list_for_each_entry(address, &friend->hostnames, hostname_list)
    {
        GF_VALIDATE_OR_GOTO(this->name, (address != NULL), out);

        snprintf(key, sizeof(key), "%s.hostname%d", prefix, count);
        ret = dict_set_dynstr_with_alloc(dict, key, address->hostname);
        if (ret) {
            gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_SET_FAILED,
                   "Failed to set key %s in dict", key);
            goto out;
        }
        count++;
    }
    ret = snprintf(key, sizeof(key), "%s.address-count", prefix);
    ret = dict_set_int32n(dict, key, ret, count);
    if (ret)
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_SET_FAILED,
               "Failed to set key %s in dict", key);

out:
    gf_msg_debug(this ? this->name : "glusterd", 0, "Returning %d", ret);
    return ret;
}

/* gd_peerinfo_find_from_hostname iterates over all the addresses saved for each
 * peer and matches it to @hoststr.
 * Returns the matched peer if found else returns NULL
 */
glusterd_peerinfo_t *
gd_peerinfo_find_from_hostname(const char *hoststr)
{
    xlator_t *this = NULL;
    glusterd_conf_t *priv = NULL;
    glusterd_peerinfo_t *peer = NULL;
    glusterd_peerinfo_t *found = NULL;
    glusterd_peer_hostname_t *tmphost = NULL;

    this = THIS;
    GF_ASSERT(this != NULL);
    priv = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (priv != NULL), out);

    GF_VALIDATE_OR_GOTO(this->name, (hoststr != NULL), out);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(peer, &priv->peers, uuid_list)
    {
        cds_list_for_each_entry_rcu(tmphost, &peer->hostnames, hostname_list)
        {
            if (!strncasecmp(tmphost->hostname, hoststr, 1024)) {
                gf_msg_debug(this->name, 0, "Friend %s found.. state: %d",
                             tmphost->hostname, peer->state.state);
                found = peer; /* Probably needs to be
                                 dereferenced*/
                goto unlock;
            }
        }
    }
unlock:
    RCU_READ_UNLOCK;
out:
    return found;
}

/* gd_peerinfo_find_from_addrinfo iterates over all the addresses saved for each
 * peer, resolves them and compares them to @addr.
 *
 *
 * NOTE: As getaddrinfo is a blocking call and is being performed multiple times
 * in this function, it could lead to the calling thread to be blocked for
 * significant amounts of time.
 *
 * Returns the matched peer if found else returns NULL
 */
glusterd_peerinfo_t *
gd_peerinfo_find_from_addrinfo(const struct addrinfo *addr)
{
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    glusterd_peerinfo_t *peer = NULL;
    glusterd_peerinfo_t *found = NULL;
    glusterd_peer_hostname_t *address = NULL;
    int ret = 0;
    struct addrinfo *paddr = NULL;
    struct addrinfo *tmp = NULL;

    this = THIS;
    GF_ASSERT(this != NULL);
    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (conf != NULL), out);

    GF_VALIDATE_OR_GOTO(this->name, (addr != NULL), out);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(peer, &conf->peers, uuid_list)
    {
        cds_list_for_each_entry_rcu(address, &peer->hostnames, hostname_list)
        {
            /* TODO: Cache the resolved addrinfos to improve
             * performance
             */
            ret = getaddrinfo(address->hostname, NULL, NULL, &paddr);
            if (ret) {
                /* Don't fail if getaddrinfo fails, continue
                 * onto the next address
                 */
                gf_msg_trace(this->name, 0, "getaddrinfo for %s failed (%s)",
                             address->hostname, gai_strerror(ret));
                ret = 0;
                continue;
            }

            for (tmp = paddr; tmp != NULL; tmp = tmp->ai_next) {
                if (gf_compare_sockaddr(addr->ai_addr, tmp->ai_addr)) {
                    found = peer; /* (de)referenced? */
                    break;
                }
            }

            freeaddrinfo(paddr);
            if (found)
                goto unlock;
        }
    }
unlock:
    RCU_READ_UNLOCK;
out:
    return found;
}

/* gd_update_peerinfo_from_dict will update the hostnames for @peerinfo from
 * peer details with @prefix in @dict.
 * Returns 0 on success and -1 on failure.
 */
int
gd_update_peerinfo_from_dict(glusterd_peerinfo_t *peerinfo, dict_t *dict,
                             const char *prefix)
{
    int ret = -1;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    char key[100] = {
        0,
    };
    char *hostname = NULL;
    int count = 0;
    int i = 0;

    this = THIS;
    GF_ASSERT(this != NULL);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (conf != NULL), out);

    GF_VALIDATE_OR_GOTO(this->name, (peerinfo != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (dict != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (prefix != NULL), out);

    ret = snprintf(key, sizeof(key), "%s.hostname", prefix);
    ret = dict_get_strn(dict, key, ret, &hostname);
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_GET_FAILED,
               "Key %s not present in "
               "dictionary",
               key);
        goto out;
    }
    ret = gd_add_address_to_peer(peerinfo, hostname);
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_ADD_ADDRESS_TO_PEER_FAIL,
               "Could not add address to peer");
        goto out;
    }
    /* Also set peerinfo->hostname to the first address */
    if (peerinfo->hostname != NULL)
        GF_FREE(peerinfo->hostname);
    peerinfo->hostname = gf_strdup(hostname);

    if (conf->op_version < GD_OP_VERSION_3_6_0) {
        ret = 0;
        goto out;
    }

    ret = snprintf(key, sizeof(key), "%s.address-count", prefix);
    ret = dict_get_int32n(dict, key, ret, &count);
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_GET_FAILED,
               "Key %s not present in "
               "dictionary",
               key);
        goto out;
    }
    hostname = NULL;
    for (i = 0; i < count; i++) {
        ret = snprintf(key, sizeof(key), "%s.hostname%d", prefix, i);
        ret = dict_get_strn(dict, key, ret, &hostname);
        if (ret) {
            gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_GET_FAILED,
                   "Key %s not present "
                   "in dictionary",
                   key);
            goto out;
        }
        ret = gd_add_address_to_peer(peerinfo, hostname);
        if (ret) {
            gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_ADD_ADDRESS_TO_PEER_FAIL,
                   "Could not add address to peer");
            goto out;
        }

        hostname = NULL;
    }

out:
    gf_msg_debug(this->name, 0, "Returning %d", ret);
    return ret;
}

/* gd_peerinfo_from_dict creates a peerinfo object from details of peer with
 * @prefix in @dict.
 * Returns a pointer to the created peerinfo object on success, and NULL on
 * failure.
 */
glusterd_peerinfo_t *
gd_peerinfo_from_dict(dict_t *dict, const char *prefix)
{
    int ret = -1;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    glusterd_peerinfo_t *new_peer = NULL;
    char key[100] = {
        0,
    };
    char *uuid_str = NULL;

    this = THIS;
    GF_VALIDATE_OR_GOTO("glusterd", (this != NULL), out);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (conf != NULL), out);

    GF_VALIDATE_OR_GOTO(this->name, (dict != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (prefix != NULL), out);

    new_peer = glusterd_peerinfo_new(GD_FRIEND_STATE_DEFAULT, NULL, NULL, 0);
    if (new_peer == NULL) {
        ret = -1;
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_PEERINFO_CREATE_FAIL,
               "Could not create peerinfo "
               "object");
        goto out;
    }

    ret = snprintf(key, sizeof(key), "%s.uuid", prefix);
    ret = dict_get_strn(dict, key, ret, &uuid_str);
    if (ret) {
        gf_msg(this->name, GF_LOG_ERROR, 0, GD_MSG_DICT_GET_FAILED,
               "Key %s not present in "
               "dictionary",
               key);
        goto out;
    }
    gf_uuid_parse(uuid_str, new_peer->uuid);

    ret = gd_update_peerinfo_from_dict(new_peer, dict, prefix);

out:
    if ((ret != 0) && (new_peer != NULL)) {
        glusterd_peerinfo_cleanup(new_peer);
        new_peer = NULL;
    }

    return new_peer;
}

int
gd_add_peer_hostnames_to_dict(glusterd_peerinfo_t *peerinfo, dict_t *dict,
                              const char *prefix)
{
    int ret = -1;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    char key[256] = {
        0,
    };
    glusterd_peer_hostname_t *addr = NULL;
    int count = 0;

    this = THIS;
    GF_ASSERT(this != NULL);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, (conf != NULL), out);

    if (conf->op_version < GD_OP_VERSION_3_6_0) {
        ret = 0;
        goto out;
    }

    GF_VALIDATE_OR_GOTO(this->name, (peerinfo != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (dict != NULL), out);
    GF_VALIDATE_OR_GOTO(this->name, (prefix != NULL), out);

    cds_list_for_each_entry(addr, &peerinfo->hostnames, hostname_list)
    {
        snprintf(key, sizeof(key), "%s.hostname%d", prefix, count);
        ret = dict_set_dynstr_with_alloc(dict, key, addr->hostname);
        if (ret)
            goto out;
        count++;
    }

    ret = snprintf(key, sizeof(key), "%s.hostname_count", prefix);
    ret = dict_set_int32n(dict, key, ret, count);

out:
    return ret;
}

int
gd_add_peer_detail_to_dict(glusterd_peerinfo_t *peerinfo, dict_t *friends,
                           int count)
{
    int ret = -1;
    char key[64] = {
        0,
    };
    int keylen;
    char *peer_uuid_str = NULL;

    GF_ASSERT(peerinfo);
    GF_ASSERT(friends);

    peer_uuid_str = gd_peer_uuid_str(peerinfo);
    keylen = snprintf(key, sizeof(key), "friend%d.uuid", count);
    ret = dict_set_strn(friends, key, keylen, peer_uuid_str);
    if (ret)
        goto out;

    keylen = snprintf(key, sizeof(key), "friend%d.hostname", count);
    ret = dict_set_strn(friends, key, keylen, peerinfo->hostname);
    if (ret)
        goto out;

    keylen = snprintf(key, sizeof(key), "friend%d.port", count);
    ret = dict_set_int32n(friends, key, keylen, peerinfo->port);
    if (ret)
        goto out;

    keylen = snprintf(key, sizeof(key), "friend%d.stateId", count);
    ret = dict_set_int32n(friends, key, keylen, peerinfo->state.state);
    if (ret)
        goto out;

    keylen = snprintf(key, sizeof(key), "friend%d.state", count);
    ret = dict_set_strn(
        friends, key, keylen,
        glusterd_friend_sm_state_name_get(peerinfo->state.state));
    if (ret)
        goto out;

    keylen = snprintf(key, sizeof(key), "friend%d.connected", count);
    ret = dict_set_int32n(friends, key, keylen, (int32_t)peerinfo->connected);
    if (ret)
        goto out;

    snprintf(key, sizeof(key), "friend%d", count);
    ret = gd_add_peer_hostnames_to_dict(peerinfo, friends, key);

out:
    return ret;
}

/* glusterd_peerinfo_find_by_generation searches for a peer which has the
 * generation number @generation and if found returns the pointer to peerinfo
 * object. Returns NULL otherwise.
 */
glusterd_peerinfo_t *
glusterd_peerinfo_find_by_generation(uint32_t generation)
{
    glusterd_conf_t *priv = NULL;
    glusterd_peerinfo_t *entry = NULL;
    glusterd_peerinfo_t *found = NULL;
    xlator_t *this = NULL;

    this = THIS;
    GF_ASSERT(this);

    priv = this->private;

    GF_ASSERT(priv);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(entry, &priv->peers, uuid_list)
    {
        if (entry->generation == generation) {
            gf_msg_debug(this->name, 0, "Friend found... state: %s",
                         glusterd_friend_sm_state_name_get(entry->state.state));
            found = entry; /* Probably should be rcu_dereferenced */
            break;
        }
    }
    RCU_READ_UNLOCK;

    if (!found)
        gf_msg_debug(this->name, 0,
                     "Friend with generation: %" PRIu32 ", not found",
                     generation);
    return found;
}

int
glusterd_get_peers_count()
{
    int count = 0;
    xlator_t *this = NULL;
    glusterd_conf_t *conf = NULL;
    glusterd_peerinfo_t *peer = NULL;

    this = THIS;
    GF_VALIDATE_OR_GOTO("glusterd", this, out);

    conf = this->private;
    GF_VALIDATE_OR_GOTO(this->name, conf, out);

    RCU_READ_LOCK;
    cds_list_for_each_entry_rcu(peer, &conf->peers, uuid_list) count++;
    RCU_READ_UNLOCK;

out:
    return count;
}