2 * Copyright (C) 2016, 2017, 2018 "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.
28 #include <json-c/json.h>
29 #if !defined(JSON_C_TO_STRING_NOSLASHESCAPE)
30 #define JSON_C_TO_STRING_NOSLASHESCAPE 0
42 static void wsj1_on_hangup(struct afb_wsj1 *wsj1);
43 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size);
45 static struct afb_ws_itf wsj1_itf = {
46 .on_hangup = (void*)wsj1_on_hangup,
47 .on_text = (void*)wsj1_on_text
52 struct wsj1_call *next;
53 void (*callback)(void *, struct afb_wsj1_msg *);
61 struct afb_wsj1 *wsj1;
62 struct afb_wsj1_msg *next, *previous;
70 size_t object_s_length;
72 struct json_object *object_j;
79 struct afb_wsj1_itf *itf;
81 struct json_tokener *tokener;
83 struct afb_wsj1_msg *messages;
84 struct wsj1_call *calls;
85 pthread_mutex_t mutex;
88 struct afb_wsj1 *afb_wsj1_create(struct fdev *fdev, struct afb_wsj1_itf *itf, void *closure)
90 struct afb_wsj1 *result;
96 result = calloc(1, sizeof * result);
100 result->refcount = 1;
102 result->closure = closure;
103 pthread_mutex_init(&result->mutex, NULL);
105 result->tokener = json_tokener_new();
106 if (result->tokener == NULL)
109 result->ws = afb_ws_create(fdev, &wsj1_itf, result);
110 if (result->ws == NULL)
116 json_tokener_free(result->tokener);
124 void afb_wsj1_addref(struct afb_wsj1 *wsj1)
127 __atomic_add_fetch(&wsj1->refcount, 1, __ATOMIC_RELAXED);
130 void afb_wsj1_unref(struct afb_wsj1 *wsj1)
132 if (wsj1 && !__atomic_sub_fetch(&wsj1->refcount, 1, __ATOMIC_RELAXED)) {
133 afb_ws_destroy(wsj1->ws);
134 json_tokener_free(wsj1->tokener);
139 static void wsj1_on_hangup(struct afb_wsj1 *wsj1)
141 if (wsj1->itf->on_hangup != NULL)
142 wsj1->itf->on_hangup(wsj1->closure, wsj1);
146 static struct wsj1_call *wsj1_locked_call_search(struct afb_wsj1 *wsj1, const char *id, int remove)
148 struct wsj1_call *r, **p;
151 while((r = *p) != NULL) {
152 if (strcmp(r->id, id) == 0) {
163 static struct wsj1_call *wsj1_call_search(struct afb_wsj1 *wsj1, const char *id, int remove)
167 pthread_mutex_lock(&wsj1->mutex);
168 r = wsj1_locked_call_search(wsj1, id, remove);
169 pthread_mutex_unlock(&wsj1->mutex);
174 static struct wsj1_call *wsj1_call_create(struct afb_wsj1 *wsj1, void (*on_reply)(void*,struct afb_wsj1_msg*), void *closure)
176 struct wsj1_call *call = malloc(sizeof *call);
180 pthread_mutex_lock(&wsj1->mutex);
182 if (wsj1->genid == 0)
183 wsj1->genid = 999999;
184 sprintf(call->id, "%d", wsj1->genid--);
185 } while (wsj1_locked_call_search(wsj1, call->id, 0) != NULL);
186 call->callback = on_reply;
187 call->closure = closure;
188 call->next = wsj1->calls;
190 pthread_mutex_unlock(&wsj1->mutex);
196 static int wsj1_msg_scan(char *text, size_t items[10][2])
198 char *pos, *beg, *end, c;
205 while(*pos == ' ') pos++;
206 if (*pos++ != '[') goto bad_scan;
209 while(*pos == ' ') pos++;
216 while (aux != 0 || (*pos != ',' && *pos != ']')) {
218 case '{': case '[': aux++; break;
219 case '}': case ']': if (aux--) break;
220 case 0: goto bad_scan;
224 case '\\': if (*pos++) break;
225 case 0: goto bad_scan;
231 while (end > beg && end[-1] == ' ')
233 items[n][0] = beg - text; /* start offset */
234 items[n][1] = end - beg; /* length */
238 while(*++pos == ' ');
241 while(*++pos == ' ');
242 if (*pos) goto bad_scan;
249 static char *wsj1_msg_parse_extract(char *text, size_t offset, size_t size)
251 text[offset + size] = 0;
252 return text + offset;
255 static char *wsj1_msg_parse_string(char *text, size_t offset, size_t size)
257 if (size > 1 && text[offset] == '"') {
261 return wsj1_msg_parse_extract(text, offset, size);
264 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size)
268 struct afb_wsj1_msg *msg;
269 struct wsj1_call *call = NULL;
272 msg = calloc(1, sizeof *msg);
277 n = wsj1_msg_scan(text, items);
281 /* scans code: 2|3|4|5 */
282 if (items[0][1] != 1) goto bad_header;
283 switch (text[items[0][0]]) {
284 case '2': msg->code = CALL; break;
285 case '3': msg->code = RETOK; break;
286 case '4': msg->code = RETERR; break;
287 case '5': msg->code = EVENT; break;
288 default: goto bad_header;
291 /* fills the message */
294 if (n != 4 && n != 5) goto bad_header;
295 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
296 msg->api = wsj1_msg_parse_string(text, items[2][0], items[2][1]);
297 msg->verb = strchr(msg->api, '/');
298 if (msg->verb == NULL) goto bad_header;
300 msg->object_s = wsj1_msg_parse_extract(text, items[3][0], items[3][1]);
301 msg->object_s_length = items[3][1];
302 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[4][0], items[4][1]) : NULL;
306 if (n != 3 && n != 4) goto bad_header;
307 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
308 call = wsj1_call_search(wsj1, msg->id, 1);
309 if (call == NULL) goto bad_header;
310 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
311 msg->object_s_length = items[2][1];
312 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[3][0], items[3][1]) : NULL;
315 if (n != 3) goto bad_header;
316 msg->event = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
317 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
318 msg->object_s_length = items[2][1];
324 /* fill and record the request */
326 afb_wsj1_addref(wsj1);
328 pthread_mutex_lock(&wsj1->mutex);
329 msg->next = wsj1->messages;
330 if (msg->next != NULL)
331 msg->next->previous = msg;
332 wsj1->messages = msg;
333 pthread_mutex_unlock(&wsj1->mutex);
335 /* incoke the handler */
338 wsj1->itf->on_call(wsj1->closure, msg->api, msg->verb, msg);
342 call->callback(call->closure, msg);
346 if (wsj1->itf->on_event != NULL)
347 wsj1->itf->on_event(wsj1->closure, msg->event, msg);
350 afb_wsj1_msg_unref(msg);
357 afb_ws_close(wsj1->ws, 1008, NULL);
360 void afb_wsj1_msg_addref(struct afb_wsj1_msg *msg)
363 __atomic_add_fetch(&msg->refcount, 1, __ATOMIC_RELAXED);
366 void afb_wsj1_msg_unref(struct afb_wsj1_msg *msg)
368 if (msg != NULL && !__atomic_sub_fetch(&msg->refcount, 1, __ATOMIC_RELAXED)) {
369 /* unlink the message */
370 pthread_mutex_lock(&msg->wsj1->mutex);
371 if (msg->next != NULL)
372 msg->next->previous = msg->previous;
373 if (msg->previous == NULL)
374 msg->wsj1->messages = msg->next;
376 msg->previous->next = msg->next;
377 pthread_mutex_unlock(&msg->wsj1->mutex);
378 /* free ressources */
379 afb_wsj1_unref(msg->wsj1);
380 json_object_put(msg->object_j);
386 const char *afb_wsj1_msg_object_s(struct afb_wsj1_msg *msg)
388 return msg->object_s;
391 struct json_object *afb_wsj1_msg_object_j(struct afb_wsj1_msg *msg)
393 struct json_object *object = msg->object_j;
394 if (object == NULL) {
395 pthread_mutex_lock(&msg->wsj1->mutex);
396 json_tokener_reset(msg->wsj1->tokener);
397 object = json_tokener_parse_ex(msg->wsj1->tokener, msg->object_s, (int)msg->object_s_length);
398 if (object == NULL && json_tokener_get_error(msg->wsj1->tokener) == json_tokener_continue)
399 object = json_tokener_parse_ex(msg->wsj1->tokener, "", 1);
400 pthread_mutex_unlock(&msg->wsj1->mutex);
401 if (object == NULL) {
402 /* lazy error detection of json request. Is it to improve? */
403 object = json_object_new_string_len(msg->object_s, (int)msg->object_s_length);
405 msg->object_j = object;
410 int afb_wsj1_msg_is_call(struct afb_wsj1_msg *msg)
412 return msg->code == CALL;
415 int afb_wsj1_msg_is_reply(struct afb_wsj1_msg *msg)
417 return msg->code == RETOK || msg->code == RETERR;
420 int afb_wsj1_msg_is_reply_ok(struct afb_wsj1_msg *msg)
422 return msg->code == RETOK;
425 int afb_wsj1_msg_is_reply_error(struct afb_wsj1_msg *msg)
427 return msg->code == RETERR;
430 int afb_wsj1_msg_is_event(struct afb_wsj1_msg *msg)
432 return msg->code == EVENT;
435 const char *afb_wsj1_msg_api(struct afb_wsj1_msg *msg)
440 const char *afb_wsj1_msg_verb(struct afb_wsj1_msg *msg)
445 const char *afb_wsj1_msg_event(struct afb_wsj1_msg *msg)
450 const char *afb_wsj1_msg_token(struct afb_wsj1_msg *msg)
455 struct afb_wsj1 *afb_wsj1_msg_wsj1(struct afb_wsj1_msg *msg)
460 int afb_wsj1_close(struct afb_wsj1 *wsj1, uint16_t code, const char *text)
462 return afb_ws_close(wsj1->ws, code, text);
465 static int wsj1_send_isot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *o1, const char *t1)
467 char code[2] = { (char)('0' + i1), 0 };
468 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
471 static int wsj1_send_issot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *s2, const char *o1, const char *t1)
473 char code[2] = { (char)('0' + i1), 0 };
474 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",\"", s2, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
477 int afb_wsj1_send_event_j(struct afb_wsj1 *wsj1, const char *event, struct json_object *object)
479 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN|JSON_C_TO_STRING_NOSLASHESCAPE);
480 int rc = afb_wsj1_send_event_s(wsj1, event, objstr);
481 json_object_put(object);
485 int afb_wsj1_send_event_s(struct afb_wsj1 *wsj1, const char *event, const char *object)
487 return wsj1_send_isot(wsj1, EVENT, event, object, NULL);
490 int afb_wsj1_call_j(struct afb_wsj1 *wsj1, const char *api, const char *verb, struct json_object *object, void (*on_reply)(void *closure, struct afb_wsj1_msg *msg), void *closure)
492 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN|JSON_C_TO_STRING_NOSLASHESCAPE);
493 int rc = afb_wsj1_call_s(wsj1, api, verb, objstr, on_reply, closure);
494 json_object_put(object);
498 int afb_wsj1_call_s(struct afb_wsj1 *wsj1, const char *api, const char *verb, const char *object, void (*on_reply)(void *closure, struct afb_wsj1_msg *msg), void *closure)
501 struct wsj1_call *call;
504 /* allocates the call */
505 call = wsj1_call_create(wsj1, on_reply, closure);
512 tag = alloca(2 + strlen(api) + strlen(verb));
513 stpcpy(stpcpy(stpcpy(tag, api), "/"), verb);
516 rc = wsj1_send_issot(wsj1, CALL, call->id, tag, object, NULL);
518 wsj1_call_search(wsj1, call->id, 1);
524 int afb_wsj1_reply_j(struct afb_wsj1_msg *msg, struct json_object *object, const char *token, int iserror)
526 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN|JSON_C_TO_STRING_NOSLASHESCAPE);
527 int rc = afb_wsj1_reply_s(msg, objstr, token, iserror);
528 json_object_put(object);
532 int afb_wsj1_reply_s(struct afb_wsj1_msg *msg, const char *object, const char *token, int iserror)
534 return wsj1_send_isot(msg->wsj1, iserror ? RETERR : RETOK, msg->id, object, token);