aboutsummaryrefslogtreecommitdiffstats
path: root/docs/reference-v3/func-req.md
blob: bdec581f1f534cf66b4f777bc2817c096b47c13a (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
Functions of class afb_req_t
============================

## General function

### afb_req_is_valid

```C
/**
 * Checks whether the request 'req' is valid or not.
 *
 * @param req the request to check
 *
 * @return 0 if not valid or 1 if valid.
 */
int afb_req_is_valid(
			afb_req_t*req);
```

### afb_req_get_api

```C
/**
 * Retrieves the api that serves the request
 *
 * @param req the request whose serving api is queried
 *
 * @return the api serving the request
 */
afb_api_t afb_req_get_api(
			afb_req_t*req);
```

### afb_req_get_vcbdata

```C
/**
 * Retrieves the callback data of the verb. This callback data is set
 * when the verb is created.
 *
 * @param req whose verb vcbdata is queried
 *
 * @return the callback data attached to the verb description
 */
void *afb_req_get_vcbdata(
			afb_req_t*req);
```

### afb_req_get_called_api

```C
/**
 * Retrieve the name of the called api.
 *
 * @param req the request
 *
 * @return the name of the called api
 *
 * @see afb_api_new_api
 * @see afb_api_add_alias
 */
const char *afb_req_get_called_api(
			afb_req_t*req);
```

### afb_req_get_called_verb

```C
/**
 * Retrieve the name of the called verb
 *
 * @param req the request
 *
 * @return the name of the called verb
 */
const char *afb_req_get_called_verb(
			afb_req_t*req);
```

### afb_req_addref

```C
/**
 * Increments the count of references of 'req'.
 *
 * @param req the request
 *
 * @return returns the request req
 */
afb_req_t*afb_req_addref(
			afb_req_t*req);
```

### afb_req_unref

```C
/**
 * Decrement the count of references of 'req'.
 *
 * @param req the request
 */
void afb_req_unref(
			afb_req_t*req);
```


## Logging functions

### afb_req_wants_log_level

```C
/**
 * Is the log message of 'level (as defined for syslog) required for the
 * request 'req'?
 *
 * @param req the request
 * @param level the level to check as defined for syslog:
 *
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @return 0 if not required or a value not null if required
 *
 * @see syslog
 */
int afb_req_wants_log_level(
			afb_req_t*req,
			int level);
```

### afb_req_vverbose

```C
/**
 * Send associated to 'req' a message described by 'fmt' and its 'args'
 * to the journal for the verbosity 'level'.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param req the request
 * @param level the level of the message
 * @param file the source filename that emits the message or NULL
 * @param line the line number in the source filename that emits the message
 * @param func the name of the function that emits the message or NULL
 * @param fmt the message format as for printf
 * @param args the arguments to the format
 *
 * @see printf
 * @see afb_req_verbose
 */
void afb_req_vverbose(
			afb_req_t*req,
			int level, const char *file,
			int line,
			const char * func,
			const char *fmt,
			va_list args);
```

### afb_req_verbose

```C
/**
 * Send associated to 'req' a message described by 'fmt' and following parameters
 * to the journal for the verbosity 'level'.
 *
 * 'file', 'line' and 'func' are indicators of position of the code in source files
 * (see macros __FILE__, __LINE__ and __func__).
 *
 * 'level' is defined by syslog standard:
 *      EMERGENCY         0        System is unusable
 *      ALERT             1        Action must be taken immediately
 *      CRITICAL          2        Critical conditions
 *      ERROR             3        Error conditions
 *      WARNING           4        Warning conditions
 *      NOTICE            5        Normal but significant condition
 *      INFO              6        Informational
 *      DEBUG             7        Debug-level messages
 *
 * @param req the request
 * @param level the level of the message
 * @param file the source filename that emits the message or NULL
 * @param line the line number in the source filename that emits the message
 * @param func the name of the function that emits the message or NULL
 * @param fmt the message format as for printf
 * @param ... the arguments of the format 'fmt'
 *
 * @see printf
 */
void afb_req_verbose(
			afb_req_t*req,
			int level, const char *file,
			int line,
			const char * func,
			const char *fmt,
			...);
```

## Arguments/parameters function

### afb_req_get

```C
/**
 * Gets from the request 'req' the argument of 'name'.
 *
 * Returns a PLAIN structure of type 'struct afb_arg'.
 *
 * When the argument of 'name' is not found, all fields of result are set to NULL.
 *
 * When the argument of 'name' is found, the fields are filled,
 * in particular, the field 'result.name' is set to 'name'.
 *
 * There is a special name value: the empty string.
 * The argument of name "" is defined only if the request was made using
 * an HTTP POST of Content-Type "application/json". In that case, the
 * argument of name "" receives the value of the body of the HTTP request.
 *
 * @param req the request
 * @param name the name of the argument to get
 *
 * @return a structure describing the retrieved argument for the request
 *
 * @see afb_req_value
 * @see afb_req_path
 */
struct afb_arg afb_req_get(
			afb_req_t*req,
			const char *name);
```

### afb_req_value

```C
/**
 * Gets from the request 'req' the string value of the argument of 'name'.
 * Returns NULL if when there is no argument of 'name'.
 * Returns the value of the argument of 'name' otherwise.
 *
 * Shortcut for: afb_req_get(req, name).value
 *
 * @param req the request
 * @param name the name of the argument's value to get
 *
 * @return the value as a string or NULL
 *
 * @see afb_req_get
 * @see afb_req_path
 */
const char *afb_req_value(
			afb_req_t*req,
			const char *name);
```

### afb_req_path

```C
/**
 * Gets from the request 'req' the path for file attached to the argument of 'name'.
 * Returns NULL if when there is no argument of 'name' or when there is no file.
 * Returns the path of the argument of 'name' otherwise.
 *
 * Shortcut for: afb_req_get(req, name).path
 *
 * @param req the request
 * @param name the name of the argument's path to get
 *
 * @return the path if any or NULL
 *
 * @see afb_req_get
 * @see afb_req_value
 */
const char *afb_req_path(
			afb_req_t*req,
			const char *name);
```

### afb_req_json

```C
/**
 * Gets from the request 'req' the json object hashing the arguments.
 *
 * The returned object must not be released using 'json_object_put'.
 *
 * @param req the request
 *
 * @return the JSON object of the query
 *
 * @see afb_req_get
 * @see afb_req_value
 * @see afb_req_path
 */
struct json_object *afb_req_json(
			afb_req_t*req);
```

## Reply functions

The functions **success** and **fail** are still supported.
These functions are now implemented as the following macros:

```C
#define afb_req_success(r,o,i)		afb_req_reply(r,o,NULL,i)
#define afb_req_success_f(r,o,...)	afb_req_reply_f(r,o,NULL,__VA_ARGS__)
#define afb_req_success_v(r,o,f,v)	afb_req_reply_v(r,o,NULL,f,v)
#define afb_req_fail(r,e,i)		afb_req_reply(r,NULL,e,i)
#define afb_req_fail_f(r,e,...)		afb_req_reply_f(r,NULL,e,__VA_ARGS__)
#define afb_req_fail_v(r,e,f,v)		afb_req_reply_v(r,NULL,e,f,v)
```


### afb_req_reply

```C
/**
 * Sends a reply to the request 'req'.
 *
 * The status of the reply is set to 'error' (that must be NULL on success).
 * Its send the object 'obj' (can be NULL) with an
 * informational comment 'info (can also be NULL).
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text or NULL
 *
 * @see afb_req_reply_v
 * @see afb_req_reply_f
 */
void afb_req_reply(
			afb_req_t*req,
			struct json_object *obj,
			const char *error,
			const char *info);
```

### afb_req_reply_v

```C
/**
 * Same as 'afb_req_reply_f' but the arguments to the format 'info'
 * are given as a variable argument list instance.
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text containing a format as for vprintf
 * @param args the va_list of arguments to the format as for vprintf
 *
 * @see afb_req_reply
 * @see afb_req_reply_f
 * @see vprintf
 */
void afb_req_reply_v(
			afb_req_t*req,
			struct json_object *obj,
			const char *error,
			const char *info,
			va_list args);
```

### afb_req_reply_f

```C
/**
 * Same as 'afb_req_reply' but the 'info' is a formatting
 * string followed by arguments.
 *
 * For convenience, the function calls 'json_object_put' for 'obj'.
 * Thus, in the case where 'obj' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param obj the replied object or NULL
 * @param error the error message if it is a reply error or NULL
 * @param info an informative text containing a format as for printf
 * @param ... the arguments to the format as for printf
 *
 * @see afb_req_reply
 * @see afb_req_reply_v
 * @see printf
 */
void afb_req_reply_f(
			afb_req_t*req,
			struct json_object *obj,
			const char *error,
			const char *info,
			...);
```

## Subcall functions



### afb_req_subcall

```C
/**
 * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
 * The result of the call is delivered to the 'callback' function with the 'callback_closure'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * The 'callback' receives 5 arguments:
 *  1. 'closure' the user defined closure pointer 'closure',
 *  2. 'object'  a JSON object returned (can be NULL)
 *  3. 'error'   a string not NULL in case of error
 *  4. 'info'    a string handling some info (can be NULL)
 *  5. 'req'     the req
 *
 * @param req      The request
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param flags    The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags_t
 * @param callback The to call on completion
 * @param closure  The closure to pass to the callback
 *
 * The flags are any combination of the following values:
 *
 *    - afb_req_x2_subcall_catch_events = 1
 *
 *        the calling API wants to receive the events from subscription
 *
 *    - afb_req_x2_subcall_pass_events = 2
 *
 *        the original request will receive the events from subscription
 *
 *    - afb_req_x2_subcall_on_behalf = 4
 *
 *        the calling API wants to use the credentials of the original request
 *
 *    - afb_req_x2_subcall_api_session = 8
 *
 *        the calling API wants to use its session instead of the one of the
 *        original request
 *
 * @see also 'afb_req_subcall_sync'
 */
void afb_req_subcall(
			afb_req_t*req,
			const char *api,
			const char *verb,
			struct json_object *args,
			int flags,
			void (*callback)(
					void *closure,
					struct json_object *object,
					const char *error,
					const char * info,
					afb_req_t*req),
			void *closure);
```

### afb_req_subcall_sync

```C
/**
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * This call is synchronous, it waits untill completion of the request.
 * It returns 0 on success or a negative value on error answer.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * See also:
 *  - 'afb_req_subcall_req' that is convenient to keep request alive automatically.
 *  - 'afb_req_subcall' that doesn't keep request alive automatically.
 *
 * @param req      The request
 * @param api      The api name of the method to call
 * @param verb     The verb name of the method to call
 * @param args     The arguments to pass to the method
 * @param flags    The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags
 * @param object   a pointer where the replied JSON object is stored must be freed using @ref json_object_put (can be NULL)
 * @param error    a pointer where a copy of the replied error is stored must be freed using @ref free (can be NULL)
 * @param info     a pointer where a copy of the replied info is stored must be freed using @ref free (can be NULL)
 *
 * @return 0 in case of success or -1 in case of error
 */
int afb_req_subcall_sync(
			afb_req_t*req,
			const char *api,
			const char *verb,
			struct json_object *args,
			int flags,
			struct json_object **object,
			char **error,
			char **info);
```

## Event functions

### afb_req_subscribe

```C
/**
 * Establishes for the client link identified by 'req' a subscription
 * to the 'event'.
 *
 * @param req the request
 * @param event the event to subscribe
 *
 * @return 0 in case of successful subscription or -1 in case of error.
 */
int afb_req_subscribe(
			afb_req_t*req,
			afb_event_t event);
```

### afb_req_unsubscribe

```C
/**
 * Revokes the subscription established to the 'event' for the client
 * link identified by 'req'.
 * Returns 0 in case of successful subscription or -1 in case of error.
 *
 * @param req the request
 * @param event the event to revoke
 *
 * @return 0 in case of successful subscription or -1 in case of error.
 */
int afb_req_unsubscribe(
			afb_req_t*req,
			afb_event_t event);
```

## Session functions

### afb_req_context

```C
/**
 * Manage the pointer stored by the binding for the client session of 'req'.
 *
 * If no previous pointer is stored or if 'replace' is not zero, a new value
 * is generated using the function 'create_context' called with the 'closure'.
 * If 'create_context' is NULL the generated value is 'closure'.
 *
 * When a value is created, the function 'free_context' is recorded and will
 * be called (with the created value as argument) to free the created value when
 * it is not more used.
 *
 * This function is atomic: it ensures that 2 threads will not race together.
 *
 * @param req the request
 * @param replace if not zero an existing value is replaced
 * @param create_context the creation function or NULL
 * @param free_context the destroying function or NULL
 * @param closure the closure to the creation function
 *
 * @return the stored value
 */
void *afb_req_context(
			afb_req_t*req,
			int replace,
			void *(*create_context)(void *closure),
			void (*free_context)(void*),
			void *closure);
```

### afb_req_context_get

```C
/**
 * Gets the pointer stored by the binding for the session of 'req'.
 * When the binding has not yet recorded a pointer, NULL is returned.
 *
 * Shortcut for: afb_req_context(req, 0, NULL, NULL, NULL)
 *
 * @param req the request
 *
 * @return the previously stored value
 */
void *afb_req_context_get(
			afb_req_t*req);
```

### afb_req_context_set

```C
/**
 * Stores for the binding the pointer 'context' to the session of 'req'.
 * The function 'free_context' will be called when the session is closed
 * or if binding stores an other pointer.
 *
 * Shortcut for: afb_req_context(req, 1, NULL, free_context, context)
 *
 *
 * @param req the request
 * @param context the context value to store
 * @param free_context the cleaning function for the stored context (can be NULL)
 */
void afb_req_context_set(
			afb_req_t*req,
			void *context,
			void (*free_context)(void*));
```

### afb_req_context_clear

```C
/**
 * Frees the pointer stored by the binding for the session of 'req'
 * and sets it to NULL.
 *
 * Shortcut for: afb_req_context_set(req, NULL, NULL)
 *
 * @param req the request
 */
void afb_req_context_clear(
			afb_req_t*req);
```

### afb_req_session_close

```C
/**
 * Closes the session associated with 'req'
 * and delete all associated contexts.
 *
 * @param req the request
 */
void afb_req_session_close(
			afb_req_t*req);
```

### afb_req_session_set_LOA

```C
/**
 * Sets the level of assurance of the session of 'req'
 * to 'level'. The effect of this function is subject of
 * security policies.
 *
 * @param req the request
 * @param level of assurance from 0 to 7
 *
 * @return 0 on success or -1 if failed.
 */
int afb_req_session_set_LOA(
			afb_req_t*req,
			unsigned level);
```

## Credential/client functions

### afb_req_has_permission

```C
/**
 * Check whether the 'permission' is granted or not to the client
 * identified by 'req'.
 *
 * @param req the request
 * @param permission string to check
 *
 * @return 1 if the permission is granted or 0 otherwise.
 */
int afb_req_has_permission(
			afb_req_t*req,
			const char *permission);
```

### afb_req_get_application_id

```C
/**
 * Get the application identifier of the client application for the
 * request 'req'.
 *
 * Returns the application identifier or NULL when the application
 * can not be identified.
 *
 * The returned value if not NULL must be freed by the caller
 *
 * @param req the request
 *
 * @return the string for the application id of the client MUST BE FREED
 */
char *afb_req_get_application_id(
			afb_req_t*req);
```

### afb_req_get_uid

```C
/**
 * Get the user identifier (UID) of the client for the
 * request 'req'.
 *
 * @param req the request
 *
 * @return -1 when the application can not be identified or the unix uid.
 *
 */
int afb_req_get_uid(
			afb_req_t*req);
```

### afb_req_get_client_info

```C
/**
 * Get informations about the client of the
 * request 'req'.
 *
 * Returns an object with client informations:
 *  {
 *    "pid": int, "uid": int, "gid": int,
 *    "label": string, "id": string, "user": string,
 *    "uuid": string, "LOA": int
 *  }
 *
 * If some of this information can't be computed, the field of the return
 * object will not be set at all.
 *
 * @param req the request
 *
 * @return a JSON object that must be freed using @ref json_object_put
 */
struct json_object *afb_req_get_client_info(
			afb_req_t*req);
```

## Legacy functions

### afb_req_subcall_legacy

```C
/**
 * @deprecated use @ref afb_req_subcall
 *
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * On completion, the function 'callback' is invoked with the
 * 'closure' given at call and two other parameters: 'iserror' and 'result'.
 * 'status' is 0 on success or negative when on an error reply.
 * 'result' is the json object of the reply, you must not call json_object_put
 * on the result.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param api the name of the api to call
 * @param verb the name of the verb to call
 * @param args the arguments of the call as a JSON object
 * @param callback the call back that will receive the reply
 * @param closure the closure passed back to the callback
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 */
void afb_req_subcall_legacy(
			afb_req_t*req,
			const char *api,
			const char *verb,
			struct json_object *args,
			void (*callback)(
					void *closure,
					int iserror,
					struct json_object *result,
					afb_req_t*req),
			void *closure);
```

### afb_req_subcall_sync_legacy

```C
/**
 * @deprecated use @ref afb_req_subcall_sync
 *
 * Makes a call to the method of name 'api' / 'verb' with the object 'args'.
 * This call is made in the context of the request 'req'.
 * This call is synchronous, it waits untill completion of the request.
 * It returns 0 on success or a negative value on error answer.
 * The object pointed by 'result' is filled and must be released by the caller
 * after its use by calling 'json_object_put'.
 *
 * For convenience, the function calls 'json_object_put' for 'args'.
 * Thus, in the case where 'args' should remain available after
 * the function returns, the function 'json_object_get' shall be used.
 *
 * @param req the request
 * @param api the name of the api to call
 * @param verb the name of the verb to call
 * @param args the arguments of the call as a JSON object
 * @param result the pointer to the JSON object pointer that will receive the result
 *
 * @return 0 on success or a negative value on error answer.
 *
 * @see afb_req_subcall
 * @see afb_req_subcall_sync
 */
int afb_req_subcall_sync_legacy(
			afb_req_t*req,
			const char *api,
			const char *verb,
			struct json_object *args,
			struct json_object **result);
```