2 * Copyright (C) 2016 "IoT.bzh"
3 * Author: José Bollo <jose.bollo@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
22 #include <json-c/json.h>
24 #include <afb/afb-req-itf.h>
25 #include <afb/afb-service-itf.h>
28 #include "afb-context.h"
30 #include "afb-subcall.h"
34 * Structure for recording service
38 /* session of the service */
39 struct AFB_clientCtx *session;
41 /* event listener of the service or NULL */
42 struct afb_evt_listener *listener;
44 /* on event callback for the service */
45 void (*on_event)(const char *event, struct json_object *object);
49 * Structure for requests initiated by the service
54 * CAUTION: 'context' field should be the first because there
55 * is an implicit convertion to struct afb_context
57 struct afb_context context;
62 /* the count of references to the request */
66 /* functions for services */
67 static void svc_on_event(struct afb_svc *svc, const char *event, struct json_object *object);
68 static void svc_call(struct afb_svc *svc, const char *api, const char *verb, struct json_object *args,
69 void (*callback)(void*, int, struct json_object*), void *closure);
71 /* the interface for services */
72 static const struct afb_service_itf service_itf = {
73 .call = (void*)svc_call
76 /* functions for requests of services */
77 static void svcreq_addref(struct svc_req *svcreq);
78 static void svcreq_unref(struct svc_req *svcreq);
79 static int svcreq_subscribe(struct svc_req *svcreq, struct afb_event event);
80 static int svcreq_unsubscribe(struct svc_req *svcreq, struct afb_event event);
81 static void svcreq_subcall(struct svc_req *svcreq, const char *api, const char *verb, struct json_object *args,
82 void (*callback)(void*, int, struct json_object*), void *closure);
84 /* interface for requests of services */
85 const struct afb_req_itf afb_svc_req_itf = {
86 .addref = (void*)svcreq_addref,
87 .unref = (void*)svcreq_unref,
88 .context_get = (void*)afb_context_get,
89 .context_set = (void*)afb_context_set,
90 .session_close = (void*)afb_context_close,
91 .session_set_LOA = (void*)afb_context_change_loa,
92 .subscribe = (void*)svcreq_subscribe,
93 .unsubscribe = (void*)svcreq_unsubscribe,
94 .subcall = (void*)svcreq_subcall
97 /* the common session for services sahring their session */
98 static struct AFB_clientCtx *common_session;
101 * Creates a new service
103 struct afb_svc *afb_svc_create(int share_session, int (*init)(struct afb_service service), void (*on_event)(const char *event, struct json_object *object))
108 /* allocates the svc handler */
109 svc = malloc(sizeof * svc);
113 /* instanciate the session */
115 /* session shared with other svcs */
116 if (common_session == NULL) {
117 common_session = ctxClientCreate (NULL, 0);
118 if (common_session == NULL)
121 svc->session = ctxClientAddRef(common_session);
123 /* session dedicated to the svc */
124 svc->session = ctxClientCreate (NULL, 0);
125 if (svc->session == NULL)
129 /* initialises the listener if needed */
130 if (on_event == NULL)
131 svc->listener = NULL;
133 svc->listener = afb_evt_listener_create((void*)svc_on_event, svc);
134 if (svc->listener == NULL)
138 /* initialises the svc now */
139 rc = init((struct afb_service){ .itf = &service_itf, .closure = svc });
146 if (svc->listener != NULL)
147 afb_evt_listener_unref(svc->listener);
149 ctxClientUnref(svc->session);
157 * Propagates the event to the service
159 static void svc_on_event(struct afb_svc *svc, const char *event, struct json_object *object)
161 svc->on_event(event, object);
165 * Initiates a call for the service
167 static void svc_call(struct afb_svc *svc, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
169 struct svc_req *svcreq;
171 /* allocates the request */
172 svcreq = malloc(sizeof *svcreq);
174 return afb_subcall_internal_error(callback, closure);
176 /* initialises the request */
177 afb_context_init(&svcreq->context, svc->session, NULL);
178 svcreq->context.validated = 1;
180 svcreq->refcount = 1;
183 afb_subcall(&svcreq->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_svc_req_itf, .closure = svcreq });
185 /* terminates and frees ressources if needed */
186 svcreq_unref(svcreq);
189 static void svcreq_addref(struct svc_req *svcreq)
194 static void svcreq_unref(struct svc_req *svcreq)
196 if (0 == --svcreq->refcount) {
197 afb_context_disconnect(&svcreq->context);
202 static int svcreq_subscribe(struct svc_req *svcreq, struct afb_event event)
204 if (svcreq->svc->listener == NULL)
206 return afb_evt_add_watch(svcreq->svc->listener, event);
209 static int svcreq_unsubscribe(struct svc_req *svcreq, struct afb_event event)
211 if (svcreq->svc->listener == NULL)
213 return afb_evt_remove_watch(svcreq->svc->listener, event);
216 static void svcreq_subcall(struct svc_req *svcreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
218 afb_subcall(&svcreq->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_svc_req_itf, .closure = svcreq });