2 * Copyright (C) 2016, 2017 "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.
19 #define NO_BINDING_VERBOSE_MACRO
25 #include <afb/afb-binding.h>
30 #include "afb-common.h"
31 #include "afb-context.h"
32 #include "afb-api-so.h"
39 static const char afb_api_so_v1_register[] = "afbBindingV1Register";
40 static const char afb_api_so_v1_service_init[] = "afbBindingV1ServiceInit";
41 static const char afb_api_so_v1_service_event[] = "afbBindingV1ServiceEvent";
44 * Description of a binding
47 struct afb_binding *binding; /* descriptor */
48 size_t apilength; /* length of the API name */
49 void *handle; /* context of dlopen */
50 struct afb_svc *service; /* handler for service started */
51 struct afb_binding_interface interface; /* interface for the binding */
54 static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name);
55 static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object);
56 static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args);
57 static int afb_api_so_rootdir_get_fd(void *closure);
58 static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale);
60 static const struct afb_daemon_itf daemon_itf = {
61 .event_broadcast = afb_api_so_event_broadcast_cb,
62 .get_event_loop = afb_common_get_event_loop,
63 .get_user_bus = afb_common_get_user_bus,
64 .get_system_bus = afb_common_get_system_bus,
65 .vverbose = afb_api_so_vverbose_cb,
66 .event_make = afb_api_so_event_make_cb,
67 .rootdir_get_fd = afb_api_so_rootdir_get_fd,
68 .rootdir_open_locale = afb_api_so_rootdir_open_locale
71 static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name)
75 struct api_so_v1 *desc = closure;
77 /* makes the event name */
78 assert(desc->binding != NULL);
79 length = strlen(name);
80 event = alloca(length + 2 + desc->apilength);
81 memcpy(event, desc->binding->v1.prefix, desc->apilength);
82 event[desc->apilength] = '/';
83 memcpy(event + desc->apilength + 1, name, length + 1);
86 return afb_evt_create_event(event);
89 static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object)
93 struct api_so_v1 *desc = closure;
95 /* makes the event name */
96 assert(desc->binding != NULL);
97 length = strlen(name);
98 event = alloca(length + 2 + desc->apilength);
99 memcpy(event, desc->binding->v1.prefix, desc->apilength);
100 event[desc->apilength] = '/';
101 memcpy(event + desc->apilength + 1, name, length + 1);
103 return afb_evt_broadcast(event, object);
106 static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args)
109 struct api_so_v1 *desc = closure;
111 if (vasprintf(&p, fmt, args) < 0)
112 vverbose(level, file, line, fmt, args);
114 verbose(level, file, line, "%s {binding %s}", p, desc->binding->v1.prefix);
119 static int afb_api_so_rootdir_get_fd(void *closure)
121 return afb_common_rootdir_get_fd();
124 static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale)
126 return afb_common_rootdir_open_locale(filename, flags, locale);
129 static const struct afb_verb_desc_v1 *search(struct api_so_v1 *desc, const char *name)
131 const struct afb_verb_desc_v1 *verb;
133 verb = desc->binding->v1.verbs;
134 while (verb->name && strcasecmp(verb->name, name))
136 return verb->name ? verb : NULL;
139 static void call_cb(void *closure, struct afb_xreq *xreq)
141 const struct afb_verb_desc_v1 *verb;
142 struct api_so_v1 *desc = closure;
144 verb = search(desc, xreq->verb);
146 afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, desc->binding->v1.prefix);
148 xreq->sessionflags = (int)verb->session;
150 xreq->callback = verb->callback;
155 static int service_start_cb(void *closure, int share_session, int onneed)
157 int (*init)(struct afb_service service);
158 void (*onevent)(const char *event, struct json_object *object);
160 struct api_so_v1 *desc = closure;
163 if (desc->service != NULL) {
164 /* not an error when onneed */
168 /* already started: it is an error */
169 ERROR("Service %s already started", desc->binding->v1.prefix);
173 /* get the initialisation */
174 init = dlsym(desc->handle, afb_api_so_v1_service_init);
176 /* not an error when onneed */
180 /* no initialisation method */
181 ERROR("Binding %s is not a service", desc->binding->v1.prefix);
185 /* get the event handler if any */
186 onevent = dlsym(desc->handle, afb_api_so_v1_service_event);
187 desc->service = afb_svc_create(share_session, init, onevent);
188 if (desc->service == NULL) {
190 ERROR("Starting service %s failed", desc->binding->v1.prefix);
197 int afb_api_so_v1_add(const char *path, void *handle)
199 struct api_so_v1 *desc;
200 struct afb_binding *(*register_function) (const struct afb_binding_interface *interface);
201 struct afb_verb_desc_v1 fake_verb;
202 struct afb_binding fake_binding;
204 /* retrieves the register function */
205 register_function = dlsym(handle, afb_api_so_v1_register);
206 if (!register_function)
208 INFO("binding [%s] is a valid AFB binding V1", path);
210 /* allocates the description */
211 desc = calloc(1, sizeof *desc);
213 ERROR("out of memory");
216 desc->handle = handle;
218 /* init the interface */
219 desc->interface.verbosity = verbosity;
220 desc->interface.mode = AFB_MODE_LOCAL;
221 desc->interface.daemon.itf = &daemon_itf;
222 desc->interface.daemon.closure = desc;
224 /* for log purpose, a fake binding is needed here */
225 desc->binding = &fake_binding;
226 fake_binding.type = AFB_BINDING_VERSION_1;
227 fake_binding.v1.info = path;
228 fake_binding.v1.prefix = path;
229 fake_binding.v1.verbs = &fake_verb;
230 fake_verb.name = NULL;
232 /* init the binding */
233 NOTICE("binding [%s] calling registering function %s", path, afb_api_so_v1_register);
234 desc->binding = register_function(&desc->interface);
235 if (desc->binding == NULL) {
236 ERROR("binding [%s] register function failed. continuing...", path);
240 /* check the returned structure */
241 if (desc->binding->type != AFB_BINDING_VERSION_1) {
242 ERROR("binding [%s] invalid type %d...", path, desc->binding->type);
245 if (desc->binding->v1.prefix == NULL || *desc->binding->v1.prefix == 0) {
246 ERROR("binding [%s] bad prefix...", path);
249 if (!afb_apis_is_valid_api_name(desc->binding->v1.prefix)) {
250 ERROR("binding [%s] invalid prefix...", path);
253 if (desc->binding->v1.info == NULL || *desc->binding->v1.info == 0) {
254 ERROR("binding [%s] bad description...", path);
257 if (desc->binding->v1.verbs == NULL) {
258 ERROR("binding [%s] no APIs...", path);
262 /* records the binding */
263 desc->apilength = strlen(desc->binding->v1.prefix);
264 if (afb_apis_add(desc->binding->v1.prefix, (struct afb_api){
267 .service_start = service_start_cb }) < 0) {
268 ERROR("binding [%s] can't be registered...", path);
271 NOTICE("binding %s loaded with API prefix %s", path, desc->binding->v1.prefix);