1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
|
/*
* Copyright (C) 2015, 2016, 2017 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#define NO_PLUGIN_VERBOSE_MACRO
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <endian.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <json-c/json.h>
#include <systemd/sd-event.h>
#include <afb/afb-req-itf.h>
#include "afb-common.h"
#include "afb-session.h"
#include "afb-ws.h"
#include "afb-msg-json.h"
#include "afb-apis.h"
#include "afb-api-so.h"
#include "afb-context.h"
#include "afb-evt.h"
#include "afb-xreq.h"
#include "verbose.h"
#include "sd-fds.h"
struct api_ws_memo;
struct api_ws_event;
struct api_ws_client;
/*
*/
struct api_ws
{
char *path; /* path of the object for the API */
char *api; /* api name of the interface */
int fd; /* file descriptor */
union {
struct {
uint32_t id;
struct afb_ws *ws;
struct api_ws_event *events;
struct api_ws_memo *memos;
} client;
struct {
sd_event_source *listensrc;
struct afb_evt_listener *listener; /* listener for broadcasted events */
} server;
};
};
#define RETOK 1
#define RETERR 2
#define RETRAW 3
/******************* websocket interface for client part **********************************/
static void api_ws_client_on_binary(void *closure, char *data, size_t size);
static const struct afb_ws_itf api_ws_client_ws_itf =
{
.on_close = NULL,
.on_text = NULL,
.on_binary = api_ws_client_on_binary,
.on_error = NULL,
.on_hangup = NULL
};
/******************* event structures for server part **********************************/
static void api_ws_server_event_add(void *closure, const char *event, int eventid);
static void api_ws_server_event_remove(void *closure, const char *event, int eventid);
static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object);
static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object);
/* the interface for events pushing */
static const struct afb_evt_itf api_ws_server_evt_itf = {
.broadcast = api_ws_server_event_broadcast,
.push = api_ws_server_event_push,
.add = api_ws_server_event_add,
.remove = api_ws_server_event_remove
};
/******************* client description part for server *****************************/
struct api_ws_client
{
/* the server ws-api */
const char *api;
/* count of references */
int refcount;
/* listener for events */
struct afb_evt_listener *listener;
/* file descriptor */
int fd;
/* websocket */
struct afb_ws *ws;
};
/******************* websocket interface for client part **********************************/
static void api_ws_server_on_binary(void *closure, char *data, size_t size);
static void api_ws_server_on_hangup(void *closure);
static const struct afb_ws_itf api_ws_server_ws_itf =
{
.on_close = NULL,
.on_text = NULL,
.on_binary = api_ws_server_on_binary,
.on_error = NULL,
.on_hangup = api_ws_server_on_hangup
};
/******************* ws request part for server *****************/
/*
* structure for a ws request
*/
struct api_ws_server_req {
struct afb_xreq xreq; /* the xreq */
struct api_ws_client *client; /* the client of the request */
char *rcvdata; /* the received data to free */
const char *request; /* the readen request as string */
size_t lenreq; /* the length of the request */
uint32_t msgid; /* the incoming request msgid */
};
static void api_ws_server_req_success_cb(void *closure, struct json_object *obj, const char *info);
static void api_ws_server_req_fail_cb(void *closure, const char *status, const char *info);
static void api_ws_server_req_destroy_cb(void *closure);
static int api_ws_server_req_subscribe_cb(void *closure, struct afb_event event);
static int api_ws_server_req_unsubscribe_cb(void *closure, struct afb_event event);
const struct afb_xreq_query_itf afb_api_ws_xreq_itf = {
.success = api_ws_server_req_success_cb,
.fail = api_ws_server_req_fail_cb,
.unref = api_ws_server_req_destroy_cb,
.subscribe = api_ws_server_req_subscribe_cb,
.unsubscribe = api_ws_server_req_unsubscribe_cb
};
/******************* common part **********************************/
/*
* create a structure api_ws not connected to the 'path'.
*/
static struct api_ws *api_ws_make(const char *path)
{
struct api_ws *api;
size_t length;
/* allocates the structure */
length = strlen(path);
api = calloc(1, sizeof *api + 1 + length);
if (api == NULL) {
errno = ENOMEM;
goto error;
}
/* path is copied after the struct */
api->path = (char*)(api+1);
memcpy(api->path, path, length + 1);
/* api name is at the end of the path */
while (length && path[length - 1] != '/' && path[length - 1] != ':')
length = length - 1;
api->api = &api->path[length];
if (api->api == NULL || !afb_apis_is_valid_api_name(api->api)) {
errno = EINVAL;
goto error2;
}
api->fd = -1;
return api;
error2:
free(api);
error:
return NULL;
}
static int api_ws_socket_unix(const char *path, int server)
{
int fd, rc;
struct sockaddr_un addr;
size_t length;
length = strlen(path);
if (length >= 108) {
errno = ENAMETOOLONG;
return -1;
}
if (server)
unlink(path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return fd;
memset(&addr, 0, sizeof addr);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, path);
if (server) {
rc = bind(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
} else {
rc = connect(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
}
if (rc < 0) {
close(fd);
return rc;
}
return fd;
}
static int api_ws_socket_inet(const char *path, int server)
{
int rc, fd;
const char *service, *host, *api;
struct addrinfo hint, *rai, *iai;
/* scan the uri */
api = strrchr(path, '/');
service = strrchr(path, ':');
if (api == NULL || service == NULL || api < service) {
errno = EINVAL;
return -1;
}
host = strndupa(path, service++ - path);
service = strndupa(service, api - service);
/* get addr */
memset(&hint, 0, sizeof hint);
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
rc = getaddrinfo(host, service, &hint, &rai);
if (rc != 0) {
errno = EINVAL;
return -1;
}
/* get the socket */
iai = rai;
while (iai != NULL) {
fd = socket(iai->ai_family, iai->ai_socktype, iai->ai_protocol);
if (fd >= 0) {
if (server) {
rc = bind(fd, iai->ai_addr, iai->ai_addrlen);
} else {
rc = connect(fd, iai->ai_addr, iai->ai_addrlen);
}
if (rc == 0) {
freeaddrinfo(rai);
return fd;
}
close(fd);
}
iai = iai->ai_next;
}
freeaddrinfo(rai);
return -1;
}
static int api_ws_socket(const char *path, int server)
{
int fd, rc;
/* check for systemd socket */
if (0 == strncmp(path, "sd:", 3))
fd = sd_fds_for(path + 3);
else {
/* check for unix socket */
if (0 == strncmp(path, "unix:", 5))
/* unix socket */
fd = api_ws_socket_unix(path + 5, server);
else
/* inet socket */
fd = api_ws_socket_inet(path, server);
if (fd >= 0 && server) {
rc = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &rc, sizeof rc);
rc = listen(fd, 5);
}
}
/* configure the socket */
if (fd >= 0) {
fcntl(fd, F_SETFD, FD_CLOEXEC);
fcntl(fd, F_SETFL, O_NONBLOCK);
}
return fd;
}
/******************* serialisation part **********************************/
struct readbuf
{
char *head, *end;
};
#define WRITEBUF_COUNT_MAX 32
struct writebuf
{
struct iovec iovec[WRITEBUF_COUNT_MAX];
uint32_t uints[WRITEBUF_COUNT_MAX];
int count;
};
static char *api_ws_read_get(struct readbuf *rb, uint32_t length)
{
char *before = rb->head;
char *after = before + length;
if (after > rb->end)
return 0;
rb->head = after;
return before;
}
static int api_ws_read_uint32(struct readbuf *rb, uint32_t *value)
{
char *after = rb->head + sizeof *value;
if (after > rb->end)
return 0;
memcpy(value, rb->head, sizeof *value);
rb->head = after;
*value = le32toh(*value);
return 1;
}
static int api_ws_read_string(struct readbuf *rb, const char **value, size_t *length)
{
uint32_t len;
if (!api_ws_read_uint32(rb, &len) || !len)
return 0;
if (length)
*length = (size_t)(len - 1);
return (*value = api_ws_read_get(rb, len)) != NULL && rb->head[-1] == 0;
}
static int api_ws_read_object(struct readbuf *rb, struct json_object **object)
{
size_t length;
const char *string;
return api_ws_read_string(rb, &string, &length) && ((*object = json_tokener_parse(string)) != NULL) == (strcmp(string, "null") != 0);
}
static int api_ws_write_put(struct writebuf *wb, const void *value, size_t length)
{
int i = wb->count;
if (i == WRITEBUF_COUNT_MAX)
return 0;
wb->iovec[i].iov_base = (void*)value;
wb->iovec[i].iov_len = length;
wb->count = i + 1;
return 1;
}
static int api_ws_write_char(struct writebuf *wb, char value)
{
int i = wb->count;
if (i == WRITEBUF_COUNT_MAX)
return 0;
*(char*)&wb->uints[i] = value;
wb->iovec[i].iov_base = &wb->uints[i];
wb->iovec[i].iov_len = 1;
wb->count = i + 1;
return 1;
}
static int api_ws_write_uint32(struct writebuf *wb, uint32_t value)
{
int i = wb->count;
if (i == WRITEBUF_COUNT_MAX)
return 0;
wb->uints[i] = htole32(value);
wb->iovec[i].iov_base = &wb->uints[i];
wb->iovec[i].iov_len = sizeof wb->uints[i];
wb->count = i + 1;
return 1;
}
static int api_ws_write_string_length(struct writebuf *wb, const char *value, size_t length)
{
uint32_t len = (uint32_t)++length;
return (size_t)len == length && len && api_ws_write_uint32(wb, len) && api_ws_write_put(wb, value, length);
}
static int api_ws_write_string(struct writebuf *wb, const char *value)
{
return api_ws_write_string_length(wb, value, strlen(value));
}
static int api_ws_write_object(struct writebuf *wb, struct json_object *object)
{
const char *string = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
return string != NULL && api_ws_write_string(wb, string);
}
/******************* client part **********************************/
/*
* structure for recording query data
*/
struct api_ws_memo {
struct api_ws_memo *next; /* the next memo */
struct api_ws *api; /* the ws api */
struct afb_xreq *xreq; /* the request handle */
#if 0
struct afb_req req; /* the request handle */
struct afb_context *context; /* the context of the query */
#endif
uint32_t msgid; /* the message identifier */
};
struct api_ws_event
{
struct api_ws_event *next;
struct afb_event event;
int eventid;
int refcount;
};
/* search a memorized request */
static struct api_ws_memo *api_ws_client_memo_search(struct api_ws *api, uint32_t msgid)
{
struct api_ws_memo *memo;
memo = api->client.memos;
while (memo != NULL && memo->msgid != msgid)
memo = memo->next;
return memo;
}
/* search the event */
static struct api_ws_event *api_ws_client_event_search(struct api_ws *api, uint32_t eventid, const char *name)
{
struct api_ws_event *ev;
ev = api->client.events;
while (ev != NULL && (ev->eventid != eventid || 0 != strcmp(afb_evt_event_name(ev->event), name)))
ev = ev->next;
return ev;
}
/* allocates and init the memorizing data */
static struct api_ws_memo *api_ws_client_memo_make(struct api_ws *api, struct afb_xreq *xreq)
{
struct api_ws_memo *memo;
memo = malloc(sizeof *memo);
if (memo != NULL) {
afb_xreq_addref(xreq);
memo->xreq = xreq;
do { memo->msgid = ++api->client.id; } while(api_ws_client_memo_search(api, memo->msgid) != NULL);
memo->api = api;
memo->next = api->client.memos;
api->client.memos = memo;
}
return memo;
}
/* free and release the memorizing data */
static void api_ws_client_memo_destroy(struct api_ws_memo *memo)
{
struct api_ws_memo **prv;
prv = &memo->api->client.memos;
while (*prv != NULL) {
if (*prv == memo) {
*prv = memo->next;
break;
}
prv = &(*prv)->next;
}
afb_xreq_unref(memo->xreq);
free(memo);
}
/* get event data from the message */
static int api_ws_client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name)
{
return api_ws_read_uint32(rb, eventid) && api_ws_read_string(rb, name, NULL);
}
/* get event from the message */
static int api_ws_client_msg_event_get(struct api_ws *api, struct readbuf *rb, struct api_ws_event **ev)
{
const char *name;
uint32_t eventid;
/* get event data from the message */
if (!api_ws_client_msg_event_read(rb, &eventid, &name)) {
ERROR("Invalid message");
return 0;
}
/* check conflicts */
*ev = api_ws_client_event_search(api, eventid, name);
if (*ev == NULL) {
ERROR("event %s not found", name);
return 0;
}
return 1;
}
/* get event from the message */
static int api_ws_client_msg_memo_get(struct api_ws *api, struct readbuf *rb, struct api_ws_memo **memo)
{
uint32_t msgid;
/* get event data from the message */
if (!api_ws_read_uint32(rb, &msgid)) {
ERROR("Invalid message");
return 0;
}
/* get the memo */
*memo = api_ws_client_memo_search(api, msgid);
if (*memo == NULL) {
ERROR("message not found");
return 0;
}
return 1;
}
/* read a subscrition message */
static int api_ws_client_msg_subscription_get(struct api_ws *api, struct readbuf *rb, struct api_ws_event **ev, struct api_ws_memo **memo)
{
return api_ws_client_msg_memo_get(api, rb, memo) && api_ws_client_msg_event_get(api, rb, ev);
}
/* adds an event */
static void api_ws_client_event_create(struct api_ws *api, struct readbuf *rb)
{
size_t offset;
const char *name;
uint32_t eventid;
struct api_ws_event *ev;
/* get event data from the message */
offset = api_ws_client_msg_event_read(rb, &eventid, &name);
if (offset == 0) {
ERROR("Invalid message");
return;
}
/* check conflicts */
ev = api_ws_client_event_search(api, eventid, name);
if (ev != NULL) {
ev->refcount++;
return;
}
/* no conflict, try to add it */
ev = malloc(sizeof *ev);
if (ev != NULL) {
ev->event = afb_evt_create_event(name);
if (ev->event.closure == NULL)
free(ev);
else {
ev->refcount = 1;
ev->eventid = eventid;
ev->next = api->client.events;
api->client.events = ev;
return;
}
}
ERROR("can't create event %s, out of memory", name);
}
/* removes an event */
static void api_ws_client_event_drop(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_event *ev, **prv;
/* retrieves the event */
if (!api_ws_client_msg_event_get(api, rb, &ev))
return;
/* decrease the reference count */
if (--ev->refcount)
return;
/* unlinks the event */
prv = &api->client.events;
while (*prv != ev)
prv = &(*prv)->next;
*prv = ev->next;
/* destroys the event */
afb_event_drop(ev->event);
free(ev);
}
/* subscribes an event */
static void api_ws_client_event_subscribe(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_event *ev;
struct api_ws_memo *memo;
if (api_ws_client_msg_subscription_get(api, rb, &ev, &memo)) {
/* subscribe the request from the event */
if (afb_xreq_subscribe(memo->xreq, ev->event) < 0)
ERROR("can't subscribe: %m");
}
}
/* unsubscribes an event */
static void api_ws_client_event_unsubscribe(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_event *ev;
struct api_ws_memo *memo;
if (api_ws_client_msg_subscription_get(api, rb, &ev, &memo)) {
/* unsubscribe the request from the event */
if (afb_xreq_unsubscribe(memo->xreq, ev->event) < 0)
ERROR("can't unsubscribe: %m");
}
}
/* receives broadcasted events */
static void api_ws_client_event_broadcast(struct api_ws *api, struct readbuf *rb)
{
struct json_object *object;
const char *event;
if (api_ws_read_string(rb, &event, NULL) && api_ws_read_object(rb, &object))
afb_evt_broadcast(event, object);
else
ERROR("unreadable broadcasted event");
}
/* pushs an event */
static void api_ws_client_event_push(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_event *ev;
struct json_object *object;
if (api_ws_client_msg_event_get(api, rb, &ev) && api_ws_read_object(rb, &object))
afb_event_push(ev->event, object);
else
ERROR("unreadable push event");
}
static void api_ws_client_reply_success(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_memo *memo;
struct json_object *object;
const char *info;
uint32_t flags;
/* retrieve the message data */
if (!api_ws_client_msg_memo_get(api, rb, &memo))
return;
if (api_ws_read_uint32(rb, &flags)
&& api_ws_read_string(rb, &info, NULL)
&& api_ws_read_object(rb, &object)) {
memo->xreq->context.flags = (unsigned)flags;
afb_xreq_success(memo->xreq, object, *info ? info : NULL);
} else {
/* failing to have the answer */
afb_xreq_fail(memo->xreq, "error", "ws error");
}
api_ws_client_memo_destroy(memo);
}
static void api_ws_client_reply_fail(struct api_ws *api, struct readbuf *rb)
{
struct api_ws_memo *memo;
const char *info, *status;
uint32_t flags;
/* retrieve the message data */
if (!api_ws_client_msg_memo_get(api, rb, &memo))
return;
if (api_ws_read_uint32(rb, &flags)
&& api_ws_read_string(rb, &status, NULL)
&& api_ws_read_string(rb, &info, NULL)) {
memo->xreq->context.flags = (unsigned)flags;
afb_xreq_fail(memo->xreq, status, *info ? info : NULL);
} else {
/* failing to have the answer */
afb_xreq_fail(memo->xreq, "error", "ws error");
}
api_ws_client_memo_destroy(memo);
}
/* callback when receiving binary data */
static void api_ws_client_on_binary(void *closure, char *data, size_t size)
{
if (size > 0) {
struct readbuf rb = { .head = data, .end = data + size };
switch (*rb.head++) {
case 'T': /* success */
api_ws_client_reply_success(closure, &rb);
break;
case 'F': /* fail */
api_ws_client_reply_fail(closure, &rb);
break;
case '*': /* broadcast */
api_ws_client_event_broadcast(closure, &rb);
break;
case '+': /* creates the event */
api_ws_client_event_create(closure, &rb);
break;
case '-': /* drops the event */
api_ws_client_event_drop(closure, &rb);
break;
case '!': /* pushs the event */
api_ws_client_event_push(closure, &rb);
break;
case 'S': /* subscribe event for a request */
api_ws_client_event_subscribe(closure, &rb);
break;
case 'U': /* unsubscribe event for a request */
api_ws_client_event_unsubscribe(closure, &rb);
break;
default: /* unexpected message */
break;
}
}
free(data);
}
/* on call, propagate it to the ws service */
static void api_ws_client_call_cb(void * closure, struct afb_xreq *xreq)
{
int rc;
struct api_ws_memo *memo;
struct writebuf wb = { .count = 0 };
const char *raw;
size_t szraw;
struct api_ws *api = closure;
/* create the recording data */
memo = api_ws_client_memo_make(api, xreq);
if (memo == NULL) {
afb_xreq_fail_f(xreq, "error", "out of memory");
return;
}
/* creates the call message */
raw = afb_xreq_raw(xreq, &szraw);
if (raw == NULL)
goto internal_error;
if (!api_ws_write_uint32(&wb, memo->msgid)
|| !api_ws_write_uint32(&wb, (uint32_t)xreq->context.flags)
|| !api_ws_write_string(&wb, xreq->verb)
|| !api_ws_write_string(&wb, afb_session_uuid(xreq->context.session))
|| !api_ws_write_string_length(&wb, raw, szraw))
goto overflow;
/* send */
rc = afb_ws_binary_v(api->client.ws, wb.iovec, wb.count);
if (rc < 0)
goto ws_send_error;
return;
ws_send_error:
afb_xreq_fail(xreq, "error", "websocket sending error");
goto clean_memo;
internal_error:
afb_xreq_fail(xreq, "error", "internal: raw is NULL!");
goto clean_memo;
overflow:
afb_xreq_fail(xreq, "error", "overflow: size doesn't match 32 bits!");
clean_memo:
api_ws_client_memo_destroy(memo);
}
static int api_ws_service_start_cb(void *closure, int share_session, int onneed)
{
struct api_ws *api = closure;
/* not an error when onneed */
if (onneed != 0)
return 0;
/* already started: it is an error */
ERROR("The WS binding %s is not a startable service", api->path);
return -1;
}
/* */
static void api_ws_client_disconnect(struct api_ws *api)
{
if (api->fd >= 0) {
afb_ws_destroy(api->client.ws);
api->client.ws = NULL;
close(api->fd);
api->fd = -1;
}
}
/* */
static int api_ws_client_connect(struct api_ws *api)
{
struct afb_ws *ws;
int fd;
fd = api_ws_socket(api->path, 0);
if (fd >= 0) {
ws = afb_ws_create(afb_common_get_event_loop(), fd, &api_ws_client_ws_itf, api);
if (ws != NULL) {
api->client.ws = ws;
api->fd = fd;
return 0;
}
close(fd);
}
return -1;
}
/* adds a afb-ws-service client api */
int afb_api_ws_add_client(const char *path)
{
int rc;
struct api_ws *api;
struct afb_api afb_api;
/* create the ws client api */
api = api_ws_make(path);
if (api == NULL)
goto error;
/* connect to the service */
rc = api_ws_client_connect(api);
if (rc < 0) {
ERROR("can't connect to ws service %s", api->path);
goto error2;
}
/* record it as an API */
afb_api.closure = api;
afb_api.call = api_ws_client_call_cb;
afb_api.service_start = api_ws_service_start_cb;
if (afb_apis_add(api->api, afb_api) < 0)
goto error3;
return 0;
error3:
api_ws_client_disconnect(api);
error2:
free(api);
error:
return -1;
}
/******************* client description part for server *****************************/
static void api_ws_server_client_unref(struct api_ws_client *client)
{
if (!--client->refcount) {
afb_evt_listener_unref(client->listener);
afb_ws_destroy(client->ws);
free(client);
}
}
/* on call, propagate it to the ws service */
static void api_ws_server_called(struct api_ws_client *client, struct readbuf *rb, char *data, size_t size)
{
struct api_ws_server_req *wreq;
const char *uuid, *verb;
uint32_t flags;
client->refcount++;
/* create the request */
wreq = calloc(1 , sizeof *wreq);
if (wreq == NULL)
goto out_of_memory;
wreq->client = client;
wreq->rcvdata = data;
/* reads the call message data */
if (!api_ws_read_uint32(rb, &wreq->msgid)
|| !api_ws_read_uint32(rb, &flags)
|| !api_ws_read_string(rb, &verb, NULL)
|| !api_ws_read_string(rb, &uuid, NULL)
|| !api_ws_read_string(rb, &wreq->request, &wreq->lenreq))
goto overflow;
wreq->xreq.json = json_tokener_parse(wreq->request);
if (wreq->xreq.json == NULL && strcmp(wreq->request, "null")) {
wreq->xreq.json = json_object_new_string(wreq->request);
}
/* init the context */
if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0)
goto out_of_memory;
wreq->xreq.context.flags = flags;
/* makes the call */
wreq->xreq.refcount = 1;
wreq->xreq.api = client->api;
wreq->xreq.verb = verb;
wreq->xreq.query = wreq;
wreq->xreq.queryitf = &afb_api_ws_xreq_itf;
afb_apis_call(&wreq->xreq);
afb_xreq_unref(&wreq->xreq);
return;
out_of_memory:
overflow:
free(wreq);
free(data);
api_ws_server_client_unref(client);
}
/* callback when receiving binary data */
static void api_ws_server_on_binary(void *closure, char *data, size_t size)
{
struct readbuf rb = { .head = data, .end = data + size };
api_ws_server_called(closure, &rb, data, size);
}
/* callback when receiving a hangup */
static void api_ws_server_on_hangup(void *closure)
{
struct api_ws_client *client = closure;
/* close the socket */
if (client->fd >= 0) {
close(client->fd);
client->fd = -1;
}
/* release the client */
api_ws_server_client_unref(client);
}
static void api_ws_server_accept(struct api_ws *api)
{
struct api_ws_client *client;
struct sockaddr addr;
socklen_t lenaddr;
client = calloc(1, sizeof *client);
if (client != NULL) {
client->listener = afb_evt_listener_create(&api_ws_server_evt_itf, client);
if (client->listener != NULL) {
lenaddr = (socklen_t)sizeof addr;
client->fd = accept(api->fd, &addr, &lenaddr);
if (client->fd >= 0) {
fcntl(client->fd, F_SETFD, FD_CLOEXEC);
fcntl(client->fd, F_SETFL, O_NONBLOCK);
client->ws = afb_ws_create(afb_common_get_event_loop(), client->fd, &api_ws_server_ws_itf, client);
if (client->ws != NULL) {
client->api = api->api;
client->refcount = 1;
return;
}
close(client->fd);
}
afb_evt_listener_unref(client->listener);
}
free(client);
}
}
/******************* server part: manage events **********************************/
static void api_ws_server_event_send(struct api_ws_client *client, char order, const char *event, int eventid, const char *data)
{
int rc;
struct writebuf wb = { .count = 0 };
if (api_ws_write_char(&wb, order)
&& api_ws_write_uint32(&wb, eventid)
&& api_ws_write_string(&wb, event)
&& (data == NULL || api_ws_write_string(&wb, data))) {
rc = afb_ws_binary_v(client->ws, wb.iovec, wb.count);
if (rc >= 0)
return;
}
ERROR("error while sending %c for event %s", order, event);
}
static void api_ws_server_event_add(void *closure, const char *event, int eventid)
{
api_ws_server_event_send(closure, '+', event, eventid, NULL);
}
static void api_ws_server_event_remove(void *closure, const char *event, int eventid)
{
api_ws_server_event_send(closure, '-', event, eventid, NULL);
}
static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object)
{
const char *data = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
api_ws_server_event_send(closure, '!', event, eventid, data ? : "null");
json_object_put(object);
}
static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object)
{
int rc;
struct api_ws_client *client = closure;
struct writebuf wb = { .count = 0 };
if (api_ws_write_char(&wb, '*') && api_ws_write_string(&wb, event) && api_ws_write_object(&wb, object)) {
rc = afb_ws_binary_v(client->ws, wb.iovec, wb.count);
if (rc < 0)
ERROR("error while broadcasting event %s", event);
} else
ERROR("error while broadcasting event %s", event);
json_object_put(object);
}
/******************* ws request part for server *****************/
/* decrement the reference count of the request and free/release it on falling to null */
static void api_ws_server_req_destroy_cb(void *closure)
{
struct api_ws_server_req *wreq = closure;
afb_context_disconnect(&wreq->xreq.context);
json_object_put(wreq->xreq.json);
free(wreq->rcvdata);
api_ws_server_client_unref(wreq->client);
free(wreq);
}
static void api_ws_server_req_success_cb(void *closure, struct json_object *obj, const char *info)
{
int rc;
struct writebuf wb = { .count = 0 };
struct api_ws_server_req *wreq = closure;
if (api_ws_write_char(&wb, 'T')
&& api_ws_write_uint32(&wb, wreq->msgid)
&& api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
&& api_ws_write_string(&wb, info ? : "")
&& api_ws_write_object(&wb, obj)) {
rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
if (rc >= 0)
goto success;
}
ERROR("error while sending success");
success:
json_object_put(obj);
}
static void api_ws_server_req_fail_cb(void *closure, const char *status, const char *info)
{
int rc;
struct writebuf wb = { .count = 0 };
struct api_ws_server_req *wreq = closure;
if (api_ws_write_char(&wb, 'F')
&& api_ws_write_uint32(&wb, wreq->msgid)
&& api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
&& api_ws_write_string(&wb, status)
&& api_ws_write_string(&wb, info ? : "")) {
rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
if (rc >= 0)
return;
}
ERROR("error while sending fail");
}
static int api_ws_server_req_subscribe_cb(void *closure, struct afb_event event)
{
int rc, rc2;
struct writebuf wb = { .count = 0 };
struct api_ws_server_req *wreq = closure;
rc = afb_evt_add_watch(wreq->client->listener, event);
if (rc < 0)
return rc;
if (api_ws_write_char(&wb, 'S')
&& api_ws_write_uint32(&wb, wreq->msgid)
&& api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
&& api_ws_write_string(&wb, afb_evt_event_name(event))) {
rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
if (rc2 >= 0)
goto success;
}
ERROR("error while subscribing event");
success:
return rc;
}
static int api_ws_server_req_unsubscribe_cb(void *closure, struct afb_event event)
{
int rc, rc2;
struct writebuf wb = { .count = 0 };
struct api_ws_server_req *wreq = closure;
if (api_ws_write_char(&wb, 'U')
&& api_ws_write_uint32(&wb, wreq->msgid)
&& api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
&& api_ws_write_string(&wb, afb_evt_event_name(event))) {
rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
if (rc2 >= 0)
goto success;
}
ERROR("error while subscribing event");
success:
rc = afb_evt_remove_watch(wreq->client->listener, event);
return rc;
}
/******************* server part **********************************/
static int api_ws_server_connect(struct api_ws *api);
static int api_ws_server_listen_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
{
if ((revents & EPOLLIN) != 0)
api_ws_server_accept(closure);
if ((revents & EPOLLHUP) != 0)
api_ws_server_connect(closure);
return 0;
}
static void api_ws_server_disconnect(struct api_ws *api)
{
if (api->server.listensrc != NULL) {
sd_event_source_unref(api->server.listensrc);
api->server.listensrc = NULL;
}
if (api->fd >= 0) {
close(api->fd);
api->fd = -1;
}
}
static int api_ws_server_connect(struct api_ws *api)
{
int rc;
/* ensure disconnected */
api_ws_server_disconnect(api);
/* request the service object name */
api->fd = api_ws_socket(api->path, 1);
if (api->fd < 0)
ERROR("can't create socket %s", api->path);
else {
/* listen for service */
rc = sd_event_add_io(afb_common_get_event_loop(), &api->server.listensrc, api->fd, EPOLLIN, api_ws_server_listen_callback, api);
if (rc >= 0)
return 0;
close(api->fd);
errno = -rc;
ERROR("can't add ws object %s", api->path);
}
return -1;
}
/* create the service */
int afb_api_ws_add_server(const char *path)
{
int rc;
struct api_ws *api;
/* creates the ws api object */
api = api_ws_make(path);
if (api == NULL)
goto error;
/* connect for serving */
rc = api_ws_server_connect(api);
if (rc < 0)
goto error2;
return 0;
error2:
free(api);
error:
return -1;
}
|