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author | Gabor X Toth <*@tg-x.net> | 2014-05-29 16:35:45 +0000 |
---|---|---|
committer | Gabor X Toth <*@tg-x.net> | 2014-05-29 16:35:45 +0000 |
commit | 0a3564262a17b8e0dddb553c31bb783c99ee1ec1 (patch) | |
tree | 0297bfdcd4b51779a5eb7a63b1d9950098cc1efd /src/util | |
parent | f7c240021dc6f06e3e143713261305b127f20735 (diff) | |
download | gnunet-0a3564262a17b8e0dddb553c31bb783c99ee1ec1.tar.gz gnunet-0a3564262a17b8e0dddb553c31bb783c99ee1ec1.zip |
client manager: higher level client API with a transmission queue and message handler registration
Diffstat (limited to 'src/util')
-rw-r--r-- | src/util/Makefile.am | 1 | ||||
-rw-r--r-- | src/util/client_manager.c | 496 |
2 files changed, 497 insertions, 0 deletions
diff --git a/src/util/Makefile.am b/src/util/Makefile.am index a33d6f63d..c8c760757 100644 --- a/src/util/Makefile.am +++ b/src/util/Makefile.am | |||
@@ -73,6 +73,7 @@ libgnunetutil_la_SOURCES = \ | |||
73 | bandwidth.c \ | 73 | bandwidth.c \ |
74 | bio.c \ | 74 | bio.c \ |
75 | client.c \ | 75 | client.c \ |
76 | client_manager.c \ | ||
76 | common_allocation.c \ | 77 | common_allocation.c \ |
77 | common_endian.c \ | 78 | common_endian.c \ |
78 | common_logging.c \ | 79 | common_logging.c \ |
diff --git a/src/util/client_manager.c b/src/util/client_manager.c new file mode 100644 index 000000000..c415ce845 --- /dev/null +++ b/src/util/client_manager.c | |||
@@ -0,0 +1,496 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | (C) 2013 Christian Grothoff (and other contributing authors) | ||
4 | |||
5 | GNUnet is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published | ||
7 | by the Free Software Foundation; either version 3, or (at your | ||
8 | option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with GNUnet; see the file COPYING. If not, write to the | ||
17 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
18 | Boston, MA 02111-1307, USA. | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file util/client_manager.c | ||
23 | * @brief Client manager; higher level client API with transmission queue | ||
24 | * and message handler registration. | ||
25 | * @author Gabor X Toth | ||
26 | */ | ||
27 | |||
28 | #include <inttypes.h> | ||
29 | |||
30 | #include "platform.h" | ||
31 | #include "gnunet_util_lib.h" | ||
32 | |||
33 | #define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__) | ||
34 | |||
35 | |||
36 | /** | ||
37 | * List of arrays of message handlers. | ||
38 | */ | ||
39 | struct HandlersListItem | ||
40 | { | ||
41 | struct HandlersListItem *prev; | ||
42 | struct HandlersListItem *next; | ||
43 | |||
44 | /** | ||
45 | * NULL-terminated array of handlers. | ||
46 | */ | ||
47 | const struct GNUNET_CLIENT_MANAGER_MessageHandler *handlers; | ||
48 | }; | ||
49 | |||
50 | |||
51 | struct MessageQueueItem | ||
52 | { | ||
53 | struct MessageQueueItem *prev; | ||
54 | struct MessageQueueItem *next; | ||
55 | struct GNUNET_MessageHeader *msg; | ||
56 | }; | ||
57 | |||
58 | |||
59 | struct GNUNET_CLIENT_MANAGER_Connection | ||
60 | { | ||
61 | /** | ||
62 | * Configuration to use. | ||
63 | */ | ||
64 | const struct GNUNET_CONFIGURATION_Handle *cfg; | ||
65 | |||
66 | /** | ||
67 | * Client connection to service. | ||
68 | */ | ||
69 | struct GNUNET_CLIENT_Connection *client; | ||
70 | |||
71 | /** | ||
72 | * Currently pending transmission request, or NULL for none. | ||
73 | */ | ||
74 | struct GNUNET_CLIENT_TransmitHandle *client_tmit; | ||
75 | |||
76 | /** | ||
77 | * Service name to connect to. | ||
78 | */ | ||
79 | const char *service_name; | ||
80 | |||
81 | /** | ||
82 | * Head of messages to transmit to the service. | ||
83 | */ | ||
84 | struct MessageQueueItem *tmit_head; | ||
85 | |||
86 | /** | ||
87 | * Tail of messages to transmit to the service. | ||
88 | */ | ||
89 | struct MessageQueueItem *tmit_tail; | ||
90 | |||
91 | /** | ||
92 | * Message handlers. | ||
93 | */ | ||
94 | const struct GNUNET_CLIENT_MANAGER_MessageHandler *handlers; | ||
95 | |||
96 | /** | ||
97 | * User context value. | ||
98 | * @see GNUNET_CLIENT_MANAGER_set_user_context() | ||
99 | * @see GNUNET_CLIENT_MANAGER_get_user_context() | ||
100 | */ | ||
101 | void *user_ctx; | ||
102 | |||
103 | /** | ||
104 | * Last size given when user context was initialized. | ||
105 | * Used for sanity check. | ||
106 | */ | ||
107 | size_t user_ctx_size; | ||
108 | |||
109 | /** | ||
110 | * Task doing exponential back-off trying to reconnect. | ||
111 | */ | ||
112 | GNUNET_SCHEDULER_TaskIdentifier reconnect_task; | ||
113 | |||
114 | /** | ||
115 | * Time for next connect retry. | ||
116 | */ | ||
117 | struct GNUNET_TIME_Relative reconnect_delay; | ||
118 | |||
119 | /** | ||
120 | * Are we currently polling for incoming messages? | ||
121 | */ | ||
122 | uint8_t in_receive; | ||
123 | |||
124 | /** | ||
125 | * #GNUNET_YES if GNUNET_CLIENT_MANAGER_disconnect() was called | ||
126 | * and we're transmitting the last messages from the queue. | ||
127 | */ | ||
128 | uint8_t disconnecting; | ||
129 | }; | ||
130 | |||
131 | |||
132 | /** | ||
133 | * Handle received messages from the service. | ||
134 | */ | ||
135 | static void | ||
136 | recv_message (void *cls, const struct GNUNET_MessageHeader *msg) | ||
137 | { | ||
138 | struct GNUNET_CLIENT_MANAGER_Connection *mgr = cls; | ||
139 | uint16_t type = 0, size = 0; | ||
140 | |||
141 | if (NULL != msg) | ||
142 | { | ||
143 | type = ntohs (msg->type); | ||
144 | size = ntohs (msg->size); | ||
145 | /* FIXME: decrease reconnect_delay gradually after a successful reconnection */ | ||
146 | } | ||
147 | |||
148 | size_t i = 0; | ||
149 | while (NULL != mgr->handlers[i].callback) | ||
150 | { | ||
151 | const struct GNUNET_CLIENT_MANAGER_MessageHandler *mh = &mgr->handlers[i]; | ||
152 | if ((mh->type == type) || (mh->type == GNUNET_MESSAGE_TYPE_ALL)) | ||
153 | { | ||
154 | if (0 != mh->expected_size | ||
155 | && ((GNUNET_NO == mh->is_variable_size && size != mh->expected_size) | ||
156 | || (GNUNET_YES == mh->is_variable_size && size < mh->expected_size))) | ||
157 | { | ||
158 | LOG (GNUNET_ERROR_TYPE_ERROR, | ||
159 | "Expected %u bytes for message of type %u, got %u.\n", | ||
160 | mh->expected_size, type, size); | ||
161 | GNUNET_break_op (0); | ||
162 | GNUNET_CLIENT_disconnect (mgr->client); | ||
163 | mgr->client = NULL; | ||
164 | recv_message (mgr, NULL); | ||
165 | break; | ||
166 | } | ||
167 | mh->callback (mh->callback_cls, mgr, msg); | ||
168 | } | ||
169 | i++; | ||
170 | } | ||
171 | if (NULL != mgr->client) | ||
172 | { | ||
173 | GNUNET_CLIENT_receive (mgr->client, &recv_message, mgr, | ||
174 | GNUNET_TIME_UNIT_FOREVER_REL); | ||
175 | } | ||
176 | } | ||
177 | |||
178 | |||
179 | /** | ||
180 | * Schedule transmission of the next message from our queue. | ||
181 | * | ||
182 | * @param mgr Client manager connection. | ||
183 | */ | ||
184 | static void | ||
185 | transmit_next (struct GNUNET_CLIENT_MANAGER_Connection *mgr); | ||
186 | |||
187 | |||
188 | /** | ||
189 | * Transmit next message to service. | ||
190 | * | ||
191 | * @param cls The struct GNUNET_PSYC_Channel. | ||
192 | * @param size Number of bytes available in @a buf. | ||
193 | * @param buf Where to copy the message. | ||
194 | * | ||
195 | * @return Number of bytes copied to @a buf. | ||
196 | */ | ||
197 | static size_t | ||
198 | send_next_message (void *cls, size_t buf_size, void *buf) | ||
199 | { | ||
200 | LOG (GNUNET_ERROR_TYPE_DEBUG, "send_next_message()\n"); | ||
201 | struct GNUNET_CLIENT_MANAGER_Connection *mgr = cls; | ||
202 | |||
203 | if (NULL == buf) | ||
204 | { | ||
205 | /* disconnected */ | ||
206 | recv_message (mgr, NULL); | ||
207 | return 0; | ||
208 | } | ||
209 | |||
210 | struct MessageQueueItem *mqi = mgr->tmit_head; | ||
211 | if (NULL == mqi) | ||
212 | return 0; | ||
213 | |||
214 | uint16_t size = ntohs (mqi->msg->size); | ||
215 | mgr->client_tmit = NULL; | ||
216 | GNUNET_assert (size <= buf_size); | ||
217 | memcpy (buf, mqi->msg, size); | ||
218 | |||
219 | GNUNET_CONTAINER_DLL_remove (mgr->tmit_head, mgr->tmit_tail, mqi); | ||
220 | GNUNET_free (mqi->msg); | ||
221 | GNUNET_free (mqi); | ||
222 | |||
223 | if (NULL != mgr->tmit_head) | ||
224 | transmit_next (mgr); | ||
225 | |||
226 | if (GNUNET_NO == mgr->in_receive) | ||
227 | { | ||
228 | mgr->in_receive = GNUNET_YES; | ||
229 | GNUNET_CLIENT_receive (mgr->client, &recv_message, mgr, | ||
230 | GNUNET_TIME_UNIT_FOREVER_REL); | ||
231 | } | ||
232 | return size; | ||
233 | } | ||
234 | |||
235 | |||
236 | /** | ||
237 | * Schedule transmission of the next message from our queue. | ||
238 | * | ||
239 | * @param mgr Client manager connection. | ||
240 | */ | ||
241 | static void | ||
242 | transmit_next (struct GNUNET_CLIENT_MANAGER_Connection *mgr) | ||
243 | { | ||
244 | LOG (GNUNET_ERROR_TYPE_DEBUG, "transmit_next()\n"); | ||
245 | if (NULL != mgr->client_tmit || NULL == mgr->client) | ||
246 | return; | ||
247 | |||
248 | if (NULL == mgr->tmit_head) | ||
249 | { | ||
250 | if (GNUNET_YES == mgr->disconnecting) | ||
251 | GNUNET_CLIENT_MANAGER_disconnect (mgr, GNUNET_NO); | ||
252 | return; | ||
253 | } | ||
254 | |||
255 | mgr->client_tmit | ||
256 | = GNUNET_CLIENT_notify_transmit_ready (mgr->client, | ||
257 | ntohs (mgr->tmit_head->msg->size), | ||
258 | GNUNET_TIME_UNIT_FOREVER_REL, | ||
259 | GNUNET_NO, | ||
260 | &send_next_message, | ||
261 | mgr); | ||
262 | } | ||
263 | |||
264 | |||
265 | /** | ||
266 | * Try again to connect to the service. | ||
267 | * | ||
268 | * @param cls Channel handle. | ||
269 | * @param tc Scheduler context. | ||
270 | */ | ||
271 | static void | ||
272 | reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) | ||
273 | { | ||
274 | struct GNUNET_CLIENT_MANAGER_Connection *mgr = cls; | ||
275 | mgr->reconnect_task = GNUNET_SCHEDULER_NO_TASK; | ||
276 | |||
277 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
278 | "Connecting to %s service.\n", mgr->service_name); | ||
279 | GNUNET_assert (NULL == mgr->client); | ||
280 | mgr->client = GNUNET_CLIENT_connect (mgr->service_name, mgr->cfg); | ||
281 | GNUNET_assert (NULL != mgr->client); | ||
282 | |||
283 | transmit_next (mgr); | ||
284 | } | ||
285 | |||
286 | |||
287 | /** | ||
288 | * Connect to service. | ||
289 | * | ||
290 | * @param cfg Configuration to use. | ||
291 | * @param service_name Service name to connect to. | ||
292 | * @param handlers Message handlers. | ||
293 | * | ||
294 | * @return Client manager connection handle. | ||
295 | */ | ||
296 | struct GNUNET_CLIENT_MANAGER_Connection * | ||
297 | GNUNET_CLIENT_MANAGER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, | ||
298 | const char *service_name, | ||
299 | const struct | ||
300 | GNUNET_CLIENT_MANAGER_MessageHandler *handlers) | ||
301 | { | ||
302 | struct GNUNET_CLIENT_MANAGER_Connection * | ||
303 | mgr = GNUNET_malloc (sizeof (*mgr)); | ||
304 | mgr->cfg = cfg; | ||
305 | mgr->service_name = service_name; | ||
306 | mgr->handlers = handlers; | ||
307 | mgr->reconnect_delay = GNUNET_TIME_UNIT_ZERO; | ||
308 | mgr->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, mgr); | ||
309 | return mgr; | ||
310 | } | ||
311 | |||
312 | |||
313 | /** | ||
314 | * Disconnect from the service. | ||
315 | * | ||
316 | * @param mgr Client manager connection. | ||
317 | * @param transmit_queue Transmit pending messages in queue before disconnecting. | ||
318 | */ | ||
319 | void | ||
320 | GNUNET_CLIENT_MANAGER_disconnect (struct GNUNET_CLIENT_MANAGER_Connection *mgr, | ||
321 | int transmit_queue) | ||
322 | { | ||
323 | if (NULL != mgr->tmit_head) | ||
324 | { | ||
325 | if (GNUNET_YES == transmit_queue) | ||
326 | { | ||
327 | mgr->disconnecting = GNUNET_YES; | ||
328 | transmit_next (mgr); | ||
329 | } | ||
330 | else | ||
331 | { | ||
332 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
333 | "Disconnecting while there are still messages " | ||
334 | "in the transmission queue.\n"); | ||
335 | GNUNET_CLIENT_MANAGER_drop_queue (mgr); | ||
336 | } | ||
337 | } | ||
338 | if (mgr->reconnect_task != GNUNET_SCHEDULER_NO_TASK) | ||
339 | { | ||
340 | GNUNET_SCHEDULER_cancel (mgr->reconnect_task); | ||
341 | mgr->reconnect_task = GNUNET_SCHEDULER_NO_TASK; | ||
342 | } | ||
343 | if (NULL != mgr->client_tmit) | ||
344 | { | ||
345 | GNUNET_CLIENT_notify_transmit_ready_cancel (mgr->client_tmit); | ||
346 | mgr->client_tmit = NULL; | ||
347 | } | ||
348 | if (NULL != mgr->client) | ||
349 | { | ||
350 | GNUNET_CLIENT_disconnect (mgr->client); | ||
351 | mgr->client = NULL; | ||
352 | } | ||
353 | GNUNET_free (mgr); | ||
354 | } | ||
355 | |||
356 | |||
357 | /** | ||
358 | * Reschedule connect to the service using exponential back-off. | ||
359 | * | ||
360 | * @param mgr Client manager connection. | ||
361 | */ | ||
362 | void | ||
363 | GNUNET_CLIENT_MANAGER_reconnect (struct GNUNET_CLIENT_MANAGER_Connection *mgr) | ||
364 | { | ||
365 | if (GNUNET_SCHEDULER_NO_TASK != mgr->reconnect_task) | ||
366 | return; | ||
367 | |||
368 | if (NULL != mgr->client_tmit) | ||
369 | { | ||
370 | GNUNET_CLIENT_notify_transmit_ready_cancel (mgr->client_tmit); | ||
371 | mgr->client_tmit = NULL; | ||
372 | } | ||
373 | if (NULL != mgr->client) | ||
374 | { | ||
375 | GNUNET_CLIENT_disconnect (mgr->client); | ||
376 | mgr->client = NULL; | ||
377 | } | ||
378 | mgr->in_receive = GNUNET_NO; | ||
379 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
380 | "Scheduling task to reconnect to service in %s.\n", | ||
381 | GNUNET_STRINGS_relative_time_to_string (mgr->reconnect_delay, GNUNET_YES)); | ||
382 | mgr->reconnect_task = | ||
383 | GNUNET_SCHEDULER_add_delayed (mgr->reconnect_delay, &reconnect, mgr); | ||
384 | mgr->reconnect_delay = GNUNET_TIME_STD_BACKOFF (mgr->reconnect_delay); | ||
385 | } | ||
386 | |||
387 | |||
388 | /** | ||
389 | * Add a message to the end of the transmission queue. | ||
390 | * | ||
391 | * @param mgr Client manager connection. | ||
392 | * @param msg Message to transmit. It is free()'d after transmission. | ||
393 | */ | ||
394 | void | ||
395 | GNUNET_CLIENT_MANAGER_transmit (struct GNUNET_CLIENT_MANAGER_Connection *mgr, | ||
396 | struct GNUNET_MessageHeader *msg) | ||
397 | { | ||
398 | struct MessageQueueItem *mqi = GNUNET_malloc (sizeof (*mqi)); | ||
399 | mqi->msg = msg; | ||
400 | GNUNET_CONTAINER_DLL_insert_tail (mgr->tmit_head, mgr->tmit_tail, mqi); | ||
401 | transmit_next (mgr); | ||
402 | } | ||
403 | |||
404 | |||
405 | /** | ||
406 | * Add a message to the beginning of the transmission queue. | ||
407 | * | ||
408 | * @param mgr Client manager connection. | ||
409 | * @param msg Message to transmit. It is free()'d after transmission. | ||
410 | */ | ||
411 | void | ||
412 | GNUNET_CLIENT_MANAGER_transmit_now (struct GNUNET_CLIENT_MANAGER_Connection *mgr, | ||
413 | struct GNUNET_MessageHeader *msg) | ||
414 | { | ||
415 | struct MessageQueueItem *mqi = GNUNET_malloc (sizeof (*mqi)); | ||
416 | mqi->msg = msg; | ||
417 | GNUNET_CONTAINER_DLL_insert (mgr->tmit_head, mgr->tmit_tail, mqi); | ||
418 | transmit_next (mgr); | ||
419 | } | ||
420 | |||
421 | |||
422 | /** | ||
423 | * Drop all queued messages. | ||
424 | * | ||
425 | * @param mgr Client manager connection. | ||
426 | */ | ||
427 | void | ||
428 | GNUNET_CLIENT_MANAGER_drop_queue (struct GNUNET_CLIENT_MANAGER_Connection *mgr) | ||
429 | { | ||
430 | struct MessageQueueItem *cur, *next = mgr->tmit_head; | ||
431 | while (NULL != next) | ||
432 | { | ||
433 | cur = next; | ||
434 | next = cur->next; | ||
435 | GNUNET_free (cur->msg); | ||
436 | GNUNET_free (cur); | ||
437 | } | ||
438 | } | ||
439 | |||
440 | |||
441 | /** | ||
442 | * Obtain client connection handle. | ||
443 | * | ||
444 | * @param mgr Client manager connection handle. | ||
445 | * | ||
446 | * @return Client connection handle. | ||
447 | */ | ||
448 | struct GNUNET_CLIENT_Connection * | ||
449 | GNUNET_CLIENT_MANAGER_get_client (struct GNUNET_CLIENT_MANAGER_Connection *mgr) | ||
450 | { | ||
451 | return mgr->client; | ||
452 | } | ||
453 | |||
454 | |||
455 | /** | ||
456 | * Return user context associated with the given client. | ||
457 | * Note: you should probably use the macro (call without the underscore). | ||
458 | * | ||
459 | * @param mgr Client manager connection. | ||
460 | * @param size Number of bytes in user context struct (for verification only). | ||
461 | * @return User context. | ||
462 | */ | ||
463 | void * | ||
464 | GNUNET_CLIENT_MANAGER_get_user_context_ (struct GNUNET_CLIENT_MANAGER_Connection *mgr, | ||
465 | size_t size) | ||
466 | { | ||
467 | if ((0 == mgr->user_ctx_size) && | ||
468 | (NULL == mgr->user_ctx)) | ||
469 | return NULL; /* never set */ | ||
470 | GNUNET_assert (size == mgr->user_ctx_size); | ||
471 | return mgr->user_ctx; | ||
472 | } | ||
473 | |||
474 | |||
475 | /** | ||
476 | * Set user context to be associated with the given client. | ||
477 | * Note: you should probably use the macro (call without the underscore). | ||
478 | * | ||
479 | * @param mgr Client manager connection. | ||
480 | * @param ctx User context. | ||
481 | * @param size Number of bytes in user context struct (for verification only). | ||
482 | */ | ||
483 | void | ||
484 | GNUNET_CLIENT_MANAGER_set_user_context_ (struct GNUNET_CLIENT_MANAGER_Connection *mgr, | ||
485 | void *ctx, | ||
486 | size_t size) | ||
487 | { | ||
488 | if (NULL == ctx) | ||
489 | { | ||
490 | mgr->user_ctx_size = 0; | ||
491 | mgr->user_ctx = ctx; | ||
492 | return; | ||
493 | } | ||
494 | mgr->user_ctx_size = size; | ||
495 | mgr->user_ctx = ctx; | ||
496 | } | ||