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.
28 #include <json-c/json.h>
38 static void wsj1_on_hangup(struct afb_wsj1 *wsj1);
39 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size);
41 static struct afb_ws_itf wsj1_itf = {
42 .on_hangup = (void*)wsj1_on_hangup,
43 .on_text = (void*)wsj1_on_text
48 struct wsj1_call *next;
49 void (*callback)(void *, struct afb_wsj1_msg *);
57 struct afb_wsj1 *wsj1;
58 struct afb_wsj1_msg *next, *previous;
66 size_t object_s_length;
68 struct json_object *object_j;
75 struct afb_wsj1_itf *itf;
77 struct json_tokener *tokener;
79 struct afb_wsj1_msg *messages;
80 struct wsj1_call *calls;
81 pthread_mutex_t mutex;
84 struct afb_wsj1 *afb_wsj1_create(struct sd_event *eloop, int fd, struct afb_wsj1_itf *itf, void *closure)
86 struct afb_wsj1 *result;
90 result = calloc(1, sizeof * result);
96 result->closure = closure;
97 pthread_mutex_init(&result->mutex, NULL);
99 result->tokener = json_tokener_new();
100 if (result->tokener == NULL)
103 result->ws = afb_ws_create(eloop, fd, &wsj1_itf, result);
104 if (result->ws == NULL)
110 json_tokener_free(result->tokener);
118 void afb_wsj1_addref(struct afb_wsj1 *wsj1)
121 __atomic_add_fetch(&wsj1->refcount, 1, __ATOMIC_RELAXED);
124 void afb_wsj1_unref(struct afb_wsj1 *wsj1)
126 if (wsj1 && !__atomic_sub_fetch(&wsj1->refcount, 1, __ATOMIC_RELAXED)) {
127 afb_ws_destroy(wsj1->ws);
128 json_tokener_free(wsj1->tokener);
133 static void wsj1_on_hangup(struct afb_wsj1 *wsj1)
135 if (wsj1->itf->on_hangup != NULL)
136 wsj1->itf->on_hangup(wsj1->closure, wsj1);
140 static struct wsj1_call *wsj1_locked_call_search(struct afb_wsj1 *wsj1, const char *id, int remove)
142 struct wsj1_call *r, **p;
145 while((r = *p) != NULL) {
146 if (strcmp(r->id, id) == 0) {
157 static struct wsj1_call *wsj1_call_search(struct afb_wsj1 *wsj1, const char *id, int remove)
161 pthread_mutex_lock(&wsj1->mutex);
162 r = wsj1_locked_call_search(wsj1, id, remove);
163 pthread_mutex_unlock(&wsj1->mutex);
168 static struct wsj1_call *wsj1_call_create(struct afb_wsj1 *wsj1, void (*on_reply)(void*,struct afb_wsj1_msg*), void *closure)
170 struct wsj1_call *call = malloc(sizeof *call);
174 pthread_mutex_lock(&wsj1->mutex);
176 if (wsj1->genid == 0)
177 wsj1->genid = 999999;
178 sprintf(call->id, "%d", wsj1->genid--);
179 } while (wsj1_locked_call_search(wsj1, call->id, 0) != NULL);
180 call->callback = on_reply;
181 call->closure = closure;
182 call->next = wsj1->calls;
184 pthread_mutex_unlock(&wsj1->mutex);
190 static int wsj1_msg_scan(char *text, size_t items[10][2])
192 char *pos, *beg, *end, c;
199 while(*pos == ' ') pos++;
200 if (*pos++ != '[') goto bad_scan;
203 while(*pos == ' ') pos++;
210 while (aux != 0 || (*pos != ',' && *pos != ']')) {
212 case '{': case '[': aux++; break;
213 case '}': case ']': if (aux--) break;
214 case 0: goto bad_scan;
218 case '\\': if (*pos++) break;
219 case 0: goto bad_scan;
225 while (end > beg && end[-1] == ' ')
227 items[n][0] = beg - text; /* start offset */
228 items[n][1] = end - beg; /* length */
232 while(*++pos == ' ');
235 while(*++pos == ' ');
236 if (*pos) goto bad_scan;
243 static char *wsj1_msg_parse_extract(char *text, size_t offset, size_t size)
245 text[offset + size] = 0;
246 return text + offset;
249 static char *wsj1_msg_parse_string(char *text, size_t offset, size_t size)
251 if (size > 1 && text[offset] == '"') {
255 return wsj1_msg_parse_extract(text, offset, size);
258 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size)
262 struct afb_wsj1_msg *msg;
263 struct wsj1_call *call = NULL;
266 msg = calloc(1, sizeof *msg);
271 n = wsj1_msg_scan(text, items);
275 /* scans code: 2|3|4|5 */
276 if (items[0][1] != 1) goto bad_header;
277 switch (text[items[0][0]]) {
278 case '2': msg->code = CALL; break;
279 case '3': msg->code = RETOK; break;
280 case '4': msg->code = RETERR; break;
281 case '5': msg->code = EVENT; break;
282 default: goto bad_header;
285 /* fills the message */
288 if (n != 4 && n != 5) goto bad_header;
289 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
290 msg->api = wsj1_msg_parse_string(text, items[2][0], items[2][1]);
291 msg->verb = strchr(msg->api, '/');
292 if (msg->verb == NULL) goto bad_header;
294 msg->object_s = wsj1_msg_parse_extract(text, items[3][0], items[3][1]);
295 msg->object_s_length = items[3][1];
296 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[4][0], items[4][1]) : NULL;
300 if (n != 3 && n != 4) goto bad_header;
301 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
302 call = wsj1_call_search(wsj1, msg->id, 1);
303 if (call == NULL) goto bad_header;
304 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
305 msg->object_s_length = items[2][1];
306 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[3][0], items[3][1]) : NULL;
309 if (n != 3) goto bad_header;
310 msg->event = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
311 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
312 msg->object_s_length = items[2][1];
318 /* fill and record the request */
320 afb_wsj1_addref(wsj1);
322 pthread_mutex_lock(&wsj1->mutex);
323 msg->next = wsj1->messages;
324 if (msg->next != NULL)
325 msg->next->previous = msg;
326 wsj1->messages = msg;
327 pthread_mutex_unlock(&wsj1->mutex);
329 /* incoke the handler */
332 wsj1->itf->on_call(wsj1->closure, msg->api, msg->verb, msg);
336 call->callback(call->closure, msg);
340 wsj1->itf->on_event(wsj1->closure, msg->event, msg);
343 afb_wsj1_msg_unref(msg);
350 afb_ws_close(wsj1->ws, 1008, NULL);
353 void afb_wsj1_msg_addref(struct afb_wsj1_msg *msg)
356 __atomic_add_fetch(&msg->refcount, 1, __ATOMIC_RELAXED);
359 void afb_wsj1_msg_unref(struct afb_wsj1_msg *msg)
361 if (msg != NULL && !__atomic_sub_fetch(&msg->refcount, 1, __ATOMIC_RELAXED)) {
362 /* unlink the message */
363 pthread_mutex_lock(&msg->wsj1->mutex);
364 if (msg->next != NULL)
365 msg->next->previous = msg->previous;
366 if (msg->previous == NULL)
367 msg->wsj1->messages = msg->next;
369 msg->previous->next = msg->next;
370 pthread_mutex_unlock(&msg->wsj1->mutex);
371 /* free ressources */
372 afb_wsj1_unref(msg->wsj1);
373 json_object_put(msg->object_j);
379 const char *afb_wsj1_msg_object_s(struct afb_wsj1_msg *msg)
381 return msg->object_s;
384 struct json_object *afb_wsj1_msg_object_j(struct afb_wsj1_msg *msg)
386 struct json_object *object = msg->object_j;
387 if (object == NULL) {
388 pthread_mutex_lock(&msg->wsj1->mutex);
389 json_tokener_reset(msg->wsj1->tokener);
390 object = json_tokener_parse_ex(msg->wsj1->tokener, msg->object_s, (int)msg->object_s_length);
391 pthread_mutex_unlock(&msg->wsj1->mutex);
392 if (object == NULL) {
393 /* lazy error detection of json request. Is it to improve? */
394 object = json_object_new_string_len(msg->object_s, (int)msg->object_s_length);
396 msg->object_j = object;
401 int afb_wsj1_msg_is_call(struct afb_wsj1_msg *msg)
403 return msg->code == CALL;
406 int afb_wsj1_msg_is_reply(struct afb_wsj1_msg *msg)
408 return msg->code == RETOK || msg->code == RETERR;
411 int afb_wsj1_msg_is_reply_ok(struct afb_wsj1_msg *msg)
413 return msg->code == RETOK;
416 int afb_wsj1_msg_is_reply_error(struct afb_wsj1_msg *msg)
418 return msg->code == RETERR;
421 int afb_wsj1_msg_is_event(struct afb_wsj1_msg *msg)
423 return msg->code == EVENT;
426 const char *afb_wsj1_msg_api(struct afb_wsj1_msg *msg)
431 const char *afb_wsj1_msg_verb(struct afb_wsj1_msg *msg)
436 const char *afb_wsj1_msg_event(struct afb_wsj1_msg *msg)
441 const char *afb_wsj1_msg_token(struct afb_wsj1_msg *msg)
446 struct afb_wsj1 *afb_wsj1_msg_wsj1(struct afb_wsj1_msg *msg)
451 int afb_wsj1_close(struct afb_wsj1 *wsj1, uint16_t code, const char *text)
453 return afb_ws_close(wsj1->ws, code, text);
456 static int wsj1_send_isot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *o1, const char *t1)
458 char code[2] = { (char)('0' + i1), 0 };
459 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
462 static int wsj1_send_issot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *s2, const char *o1, const char *t1)
464 char code[2] = { (char)('0' + i1), 0 };
465 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",\"", s2, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
468 int afb_wsj1_send_event_j(struct afb_wsj1 *wsj1, const char *event, struct json_object *object)
470 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
471 int rc = afb_wsj1_send_event_s(wsj1, event, objstr);
472 json_object_put(object);
476 int afb_wsj1_send_event_s(struct afb_wsj1 *wsj1, const char *event, const char *object)
478 return wsj1_send_isot(wsj1, EVENT, event, object, NULL);
481 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)
483 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
484 int rc = afb_wsj1_call_s(wsj1, api, verb, objstr, on_reply, closure);
485 json_object_put(object);
489 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)
492 struct wsj1_call *call;
495 /* allocates the call */
496 call = wsj1_call_create(wsj1, on_reply, closure);
503 tag = alloca(2 + strlen(api) + strlen(verb));
504 stpcpy(stpcpy(stpcpy(tag, api), "/"), verb);
507 rc = wsj1_send_issot(wsj1, CALL, call->id, tag, object, NULL);
509 wsj1_call_search(wsj1, call->id, 1);
515 int afb_wsj1_reply_j(struct afb_wsj1_msg *msg, struct json_object *object, const char *token, int iserror)
517 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
518 int rc = afb_wsj1_reply_s(msg, objstr, token, iserror);
519 json_object_put(object);
523 int afb_wsj1_reply_s(struct afb_wsj1_msg *msg, const char *object, const char *token, int iserror)
525 return wsj1_send_isot(msg->wsj1, iserror ? RETERR : RETOK, msg->id, object, token);