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.
27 #include <json-c/json.h>
37 static void wsj1_on_hangup(struct afb_wsj1 *wsj1);
38 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size);
40 static struct afb_ws_itf wsj1_itf = {
41 .on_hangup = (void*)wsj1_on_hangup,
42 .on_text = (void*)wsj1_on_text
47 struct wsj1_call *next;
48 void (*callback)(void *, struct afb_wsj1_msg *);
56 struct afb_wsj1 *wsj1;
57 struct afb_wsj1_msg *next, *previous;
65 size_t object_s_length;
67 struct json_object *object_j;
74 struct afb_wsj1_itf *itf;
76 struct json_tokener *tokener;
78 struct afb_wsj1_msg *messages;
79 struct wsj1_call *calls;
82 struct afb_wsj1 *afb_wsj1_create(int fd, struct afb_wsj1_itf *itf, void *closure)
84 struct afb_wsj1 *result;
88 result = calloc(1, sizeof * result);
94 result->closure = closure;
96 result->tokener = json_tokener_new();
97 if (result->tokener == NULL)
100 result->ws = afb_ws_create(fd, &wsj1_itf, result);
101 if (result->ws == NULL)
107 json_tokener_free(result->tokener);
115 void afb_wsj1_addref(struct afb_wsj1 *wsj1)
121 void afb_wsj1_unref(struct afb_wsj1 *wsj1)
123 if (wsj1 != NULL && !--wsj1->refcount) {
124 afb_ws_destroy(wsj1->ws);
125 json_tokener_free(wsj1->tokener);
130 static void wsj1_on_hangup(struct afb_wsj1 *wsj1)
132 if (wsj1->itf->on_hangup != NULL)
133 wsj1->itf->on_hangup(wsj1->closure, wsj1);
137 static struct wsj1_call *wsj1_call_search(struct afb_wsj1 *wsj1, const char *id, int remove)
139 struct wsj1_call *r, **p;
141 while((r = *p) != NULL) {
142 if (strcmp(r->id, id) == 0) {
152 static struct wsj1_call *wsj1_call_create(struct afb_wsj1 *wsj1, void (*on_reply)(void*,struct afb_wsj1_msg*), void *closure)
154 struct wsj1_call *call = malloc(sizeof *call);
159 if (wsj1->genid == 0)
160 wsj1->genid = 999999;
161 sprintf(call->id, "%d", wsj1->genid--);
162 } while (wsj1_call_search(wsj1, call->id, 0) != NULL);
163 call->callback = on_reply;
164 call->closure = closure;
165 call->next = wsj1->calls;
172 static int wsj1_msg_scan(char *text, size_t items[10][2])
174 char *pos, *beg, *end, c;
181 while(*pos == ' ') pos++;
182 if (*pos++ != '[') goto bad_scan;
185 while(*pos == ' ') pos++;
192 while (aux != 0 || (*pos != ',' && *pos != ']')) {
194 case '{': case '[': aux++; break;
195 case '}': case ']': if (aux--) break;
196 case 0: goto bad_scan;
200 case '\\': if (*pos++) break;
201 case 0: goto bad_scan;
207 while (end > beg && end[-1] == ' ')
209 items[n][0] = beg - text; /* start offset */
210 items[n][1] = end - beg; /* length */
214 while(*++pos == ' ');
217 while(*++pos == ' ');
218 if (*pos) goto bad_scan;
225 static char *wsj1_msg_parse_extract(char *text, size_t offset, size_t size)
227 text[offset + size] = 0;
228 return text + offset;
231 static char *wsj1_msg_parse_string(char *text, size_t offset, size_t size)
233 if (size > 1 && text[offset] == '"') {
237 return wsj1_msg_parse_extract(text, offset, size);
240 static void wsj1_on_text(struct afb_wsj1 *wsj1, char *text, size_t size)
244 struct afb_wsj1_msg *msg;
245 struct wsj1_call *call = NULL;
248 msg = calloc(1, sizeof *msg);
253 n = wsj1_msg_scan(text, items);
257 /* scans code: 2|3|4|5 */
258 if (items[0][1] != 1) goto bad_header;
259 switch (text[items[0][0]]) {
260 case '2': msg->code = CALL; break;
261 case '3': msg->code = RETOK; break;
262 case '4': msg->code = RETERR; break;
263 case '5': msg->code = EVENT; break;
264 default: goto bad_header;
267 /* fills the message */
270 if (n != 4 && n != 5) goto bad_header;
271 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
272 msg->api = wsj1_msg_parse_string(text, items[2][0], items[2][1]);
273 msg->verb = strchr(msg->api, '/');
274 if (msg->verb == NULL) goto bad_header;
276 msg->object_s = wsj1_msg_parse_extract(text, items[3][0], items[3][1]);
277 msg->object_s_length = items[3][1];
278 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[4][0], items[4][1]) : NULL;
282 if (n != 3 && n != 4) goto bad_header;
283 msg->id = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
284 call = wsj1_call_search(wsj1, msg->id, 1);
285 if (call == NULL) goto bad_header;
286 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
287 msg->object_s_length = items[2][1];
288 msg->token = n == 5 ? wsj1_msg_parse_string(text, items[3][0], items[3][1]) : NULL;
291 if (n != 3) goto bad_header;
292 msg->event = wsj1_msg_parse_string(text, items[1][0], items[1][1]);
293 msg->object_s = wsj1_msg_parse_extract(text, items[2][0], items[2][1]);
294 msg->object_s_length = items[2][1];
300 /* fill and record the request */
302 afb_wsj1_addref(wsj1);
304 msg->next = wsj1->messages;
305 if (msg->next != NULL)
306 msg->next->previous = msg;
307 wsj1->messages = msg;
309 /* incoke the handler */
312 wsj1->itf->on_call(wsj1->closure, msg->api, msg->verb, msg);
316 call->callback(call->closure, msg);
320 wsj1->itf->on_event(wsj1->closure, msg->event, msg);
323 afb_wsj1_msg_unref(msg);
330 afb_ws_close(wsj1->ws, 1008, NULL);
333 void afb_wsj1_msg_addref(struct afb_wsj1_msg *msg)
339 void afb_wsj1_msg_unref(struct afb_wsj1_msg *msg)
341 if (msg != NULL && --msg->refcount == 0) {
342 /* unlink the message */
343 if (msg->next != NULL)
344 msg->next->previous = msg->previous;
345 if (msg->previous == NULL)
346 msg->wsj1->messages = msg->next;
348 msg->previous->next = msg->next;
349 /* free ressources */
350 afb_wsj1_unref(msg->wsj1);
351 json_object_put(msg->object_j);
357 const char *afb_wsj1_msg_object_s(struct afb_wsj1_msg *msg)
359 return msg->object_s;
362 struct json_object *afb_wsj1_msg_object_j(struct afb_wsj1_msg *msg)
364 struct json_object *object = msg->object_j;
365 if (object == NULL) {
366 json_tokener_reset(msg->wsj1->tokener);
367 object = json_tokener_parse_ex(msg->wsj1->tokener, msg->object_s, (int)msg->object_s_length);
368 if (object == NULL) {
369 /* lazy error detection of json request. Is it to improve? */
370 object = json_object_new_string_len(msg->object_s, (int)msg->object_s_length);
372 msg->object_j = object;
377 int afb_wsj1_msg_is_call(struct afb_wsj1_msg *msg)
379 return msg->code == CALL;
382 int afb_wsj1_msg_is_reply(struct afb_wsj1_msg *msg)
384 return msg->code == RETOK || msg->code == RETERR;
387 int afb_wsj1_msg_is_reply_ok(struct afb_wsj1_msg *msg)
389 return msg->code == RETOK;
392 int afb_wsj1_msg_is_reply_error(struct afb_wsj1_msg *msg)
394 return msg->code == RETERR;
397 int afb_wsj1_msg_is_event(struct afb_wsj1_msg *msg)
399 return msg->code == EVENT;
402 const char *afb_wsj1_msg_api(struct afb_wsj1_msg *msg)
407 const char *afb_wsj1_msg_verb(struct afb_wsj1_msg *msg)
412 const char *afb_wsj1_msg_event(struct afb_wsj1_msg *msg)
417 const char *afb_wsj1_msg_token(struct afb_wsj1_msg *msg)
422 struct afb_wsj1 *afb_wsj1_msg_wsj1(struct afb_wsj1_msg *msg)
427 int afb_wsj1_close(struct afb_wsj1 *wsj1, uint16_t code, const char *text)
429 return afb_ws_close(wsj1->ws, code, text);
432 static int wsj1_send_isot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *o1, const char *t1)
434 char code[2] = { (char)('0' + i1), 0 };
435 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
438 static int wsj1_send_issot(struct afb_wsj1 *wsj1, int i1, const char *s1, const char *s2, const char *o1, const char *t1)
440 char code[2] = { (char)('0' + i1), 0 };
441 return afb_ws_texts(wsj1->ws, "[", code, ",\"", s1, "\",\"", s2, "\",", o1 == NULL ? "null" : o1, t1 != NULL ? ",\"" : "]", t1, "\"]", NULL);
444 int afb_wsj1_send_event_j(struct afb_wsj1 *wsj1, const char *event, struct json_object *object)
446 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
447 int rc = afb_wsj1_send_event_s(wsj1, event, objstr);
448 json_object_put(object);
452 int afb_wsj1_send_event_s(struct afb_wsj1 *wsj1, const char *event, const char *object)
454 return wsj1_send_isot(wsj1, EVENT, event, object, NULL);
457 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)
459 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
460 int rc = afb_wsj1_call_s(wsj1, api, verb, objstr, on_reply, closure);
461 json_object_put(object);
465 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)
468 struct wsj1_call *call;
471 /* allocates the call */
472 call = wsj1_call_create(wsj1, on_reply, closure);
479 tag = alloca(2 + strlen(api) + strlen(verb));
480 stpcpy(stpcpy(stpcpy(tag, api), "/"), verb);
483 rc = wsj1_send_issot(wsj1, CALL, call->id, tag, object, NULL);
485 wsj1_call_search(wsj1, call->id, 1);
491 int afb_wsj1_reply_j(struct afb_wsj1_msg *msg, struct json_object *object, const char *token, int iserror)
493 const char *objstr = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
494 int rc = afb_wsj1_reply_s(msg, objstr, token, iserror);
495 json_object_put(object);
499 int afb_wsj1_reply_s(struct afb_wsj1_msg *msg, const char *object, const char *token, int iserror)
501 return wsj1_send_isot(msg->wsj1, iserror ? RETERR : RETOK, msg->id, object, token);