2 This file is part of GNUnet.
3 (C) 2009, 2010, 2012, 2013 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * @brief API for accessing the ARM service
24 * @author Christian Grothoff, LRN
27 #include "gnunet_arm_service.h"
28 #include "gnunet_util_lib.h"
29 #include "gnunet_protocols.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "arm-api",__VA_ARGS__)
35 * Handle for interacting with ARM.
37 struct GNUNET_ARM_Handle
40 * Our control connection to the ARM service.
42 struct GNUNET_CLIENT_Connection *client;
45 * The configuration that we are using.
47 struct GNUNET_CONFIGURATION_Handle *cfg;
50 * Handle for our current transmission request.
52 struct GNUNET_CLIENT_TransmitHandle *cth;
55 * Head of doubly-linked list of pending requests.
57 struct ARMControlMessage *control_pending_head;
60 * Tail of doubly-linked list of pending requests.
62 struct ARMControlMessage *control_pending_tail;
65 * Head of doubly-linked list of sent requests.
67 struct ARMControlMessage *control_sent_head;
70 * Tail of doubly-linked list of sent requests.
72 struct ARMControlMessage *control_sent_tail;
75 * ID of the reconnect task (if any).
77 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
80 * Current delay we use for re-trying to connect to core.
82 struct GNUNET_TIME_Relative retry_backoff;
85 * Callback to invoke on connection/disconnection.
87 GNUNET_ARM_ConnectionStatusCallback conn_status;
90 * Closure for conn_status.
92 void *conn_status_cls;
95 * Counter for request identifiers
97 uint64_t request_id_counter;
100 * Are we currently disconnected and hence unable to send?
102 unsigned char currently_down;
105 * GNUNET_YES if we're running a service test.
107 unsigned char service_test_is_active;
112 * Entry in a doubly-linked list of control messages to be transmitted
113 * to the arm service.
115 * The actual message is allocated at the end of this struct.
117 struct ARMControlMessage
120 * This is a doubly-linked list.
122 struct ARMControlMessage *next;
125 * This is a doubly-linked list.
127 struct ARMControlMessage *prev;
132 struct GNUNET_ARM_Handle *h;
137 struct GNUNET_ARM_Message *msg;
140 * Callback for service state change requests.
142 GNUNET_ARM_ResultCallback result_cont;
145 * Callback for service list requests.
147 GNUNET_ARM_ServiceListCallback list_cont;
150 * Closure for 'result_cont' or 'list_cont'.
155 * Timeout for the operation.
157 struct GNUNET_TIME_Absolute timeout;
160 * Flags for passing std descriptors to ARM (when starting ARM).
162 enum GNUNET_OS_InheritStdioFlags std_inheritance;
165 * Task to run when request times out.
167 GNUNET_SCHEDULER_TaskIdentifier timeout_task_id;
170 * Type of the request expressed as a message type (start, stop or list).
176 client_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg);
179 reconnect_arm (struct GNUNET_ARM_Handle *h);
182 trigger_next_request (struct GNUNET_ARM_Handle *h, int ignore_currently_down);
186 * Task scheduled to try to re-connect to arm.
188 * @param cls the 'struct GNUNET_ARM_Handle'
189 * @param tc task context
192 reconnect_arm_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
194 struct GNUNET_ARM_Handle *h = cls;
196 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
197 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to ARM service after delay\n");
203 clear_pending_messages (struct GNUNET_ARM_Handle *h, enum GNUNET_ARM_RequestStatus result)
205 struct ARMControlMessage *cm;
207 LOG (GNUNET_ERROR_TYPE_DEBUG,
208 "Clearing pending messages\n");
210 while (NULL != (cm = h->control_pending_head))
212 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
213 h->control_pending_tail, cm);
214 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != cm->timeout_task_id);
215 GNUNET_SCHEDULER_cancel (cm->timeout_task_id);
216 if (NULL != cm->result_cont)
217 cm->result_cont (cm->cont_cls, cm->h, result, NULL, 0);
218 GNUNET_free_non_null (cm->msg);
224 * Close down any existing connection to the ARM service and
225 * try re-establishing it later.
227 * @param h our handle
230 reconnect_arm_later (struct GNUNET_ARM_Handle *h)
232 if (GNUNET_NO != h->currently_down)
236 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
239 if (NULL != h->client)
241 GNUNET_CLIENT_disconnect (h->client);
244 h->currently_down = GNUNET_YES;
245 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task);
247 GNUNET_SCHEDULER_add_delayed (h->retry_backoff, &reconnect_arm_task, h);
248 /* Don't clear pending messages on disconnection, deliver them later
249 clear_pending_messages (h, GNUNET_ARM_REQUEST_DISCONNECTED);
250 GNUNET_assert (NULL == h->control_pending_head);
252 h->retry_backoff = GNUNET_TIME_STD_BACKOFF (h->retry_backoff);
253 if (NULL != h->conn_status)
254 h->conn_status (h->conn_status_cls, h, GNUNET_NO);
258 * Transmit the next message to the arm service.
260 * @param cls closure with the 'struct GNUNET_ARM_Handle'
261 * @param size number of bytes available in buf
262 * @param buf where the callee should write the message
263 * @return number of bytes written to buf
266 transmit_arm_message (void *cls, size_t size, void *buf)
268 struct GNUNET_ARM_Handle *h = cls;
269 struct ARMControlMessage *cm;
270 struct GNUNET_ARM_Message *arm_msg;
272 int notify_connection;
275 notify_connection = GNUNET_NO;
276 LOG (GNUNET_ERROR_TYPE_DEBUG,
277 "transmit_arm_message is running with %p buffer of size %lu. ARM is known to be %s\n",
278 buf, size, h->currently_down ? "unconnected" : "connected");
279 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task);
281 if ((GNUNET_YES == h->currently_down) && (NULL != buf))
283 h->currently_down = GNUNET_NO;
284 notify_connection = GNUNET_YES;
285 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
286 GNUNET_CLIENT_receive (h->client, &client_notify_handler, h,
287 GNUNET_TIME_UNIT_FOREVER_REL);
291 LOG (GNUNET_ERROR_TYPE_DEBUG,
292 "Transmission failed, initiating reconnect\n");
293 reconnect_arm_later (h);
296 if (NULL == (cm = h->control_pending_head))
298 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue is empty, not sending anything\n");
302 GNUNET_assert (NULL != cm->msg);
303 msize = ntohs (cm->msg->header.size);
306 LOG (GNUNET_ERROR_TYPE_DEBUG,
307 "Request is too big (%u < %u), not sending it\n", size, msize);
308 trigger_next_request (h, GNUNET_NO);
313 if (0 == h->request_id_counter)
314 h->request_id_counter++;
315 request_id = h->request_id_counter++;
316 LOG (GNUNET_ERROR_TYPE_DEBUG,
317 "Transmitting control message with %u bytes of type %u to arm with id %llu\n",
318 (unsigned int) msize, (unsigned int) ntohs (cm->msg->header.type), request_id);
319 arm_msg->request_id = GNUNET_htonll (request_id);
320 memcpy (buf, cm->msg, msize);
321 /* Otherwise we won't be able to find it later! */
322 arm_msg->request_id = request_id;
323 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
324 h->control_pending_tail, cm);
325 GNUNET_CONTAINER_DLL_insert_tail (h->control_sent_head,
326 h->control_sent_tail, cm);
327 /* Don't free msg, keep it around (kind of wasteful, but then we don't
328 * really have many messages to handle, and it'll be freed when it times
331 trigger_next_request (h, GNUNET_NO);
334 if ((GNUNET_YES == notify_connection) && (NULL != h->conn_status))
335 h->conn_status (h->conn_status_cls, h, GNUNET_YES);
341 * Check the list of pending requests, send the next
344 * @param h arm handle
345 * @param ignore_currently_down transmit message even if not initialized?
348 trigger_next_request (struct GNUNET_ARM_Handle *h, int ignore_currently_down)
352 if ((GNUNET_YES == h->currently_down) && (ignore_currently_down == GNUNET_NO))
354 LOG (GNUNET_ERROR_TYPE_DEBUG,
355 "ARM connection down, not processing queue\n");
360 LOG (GNUNET_ERROR_TYPE_DEBUG, "Request pending, not processing queue\n");
363 if (NULL == h->control_pending_head)
365 LOG (GNUNET_ERROR_TYPE_DEBUG,
366 "Request queue empty, not processing queue\n");
367 return; /* no pending message */
370 ntohs (((struct GNUNET_MessageHeader *) &h->
371 control_pending_head[1])->size);
373 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
374 GNUNET_TIME_UNIT_FOREVER_REL,
375 GNUNET_NO, &transmit_arm_message, h);
382 * @param h arm handle
385 reconnect_arm (struct GNUNET_ARM_Handle *h)
387 GNUNET_assert (NULL == h->client);
388 GNUNET_assert (GNUNET_YES == h->currently_down);
389 h->client = GNUNET_CLIENT_connect ("arm", h->cfg);
390 if (NULL == h->client)
392 LOG (GNUNET_ERROR_TYPE_DEBUG,
393 "arm_api, GNUNET_CLIENT_connect returned NULL\n");
394 if (NULL != h->conn_status)
395 h->conn_status (h->conn_status_cls, h, GNUNET_SYSERR);
396 return GNUNET_SYSERR;
398 LOG (GNUNET_ERROR_TYPE_DEBUG,
399 "arm_api, GNUNET_CLIENT_connect returned non-NULL\n");
400 trigger_next_request (h, GNUNET_YES);
406 * Set up a context for communicating with ARM, then
407 * start connecting to the ARM service using that context.
409 * @param cfg configuration to use (needed to contact ARM;
410 * the ARM service may internally use a different
411 * configuration to determine how to start the service).
412 * @param conn_status will be called when connecting/disconnecting
413 * @param cls closure for conn_status
414 * @return context to use for further ARM operations, NULL on error.
416 struct GNUNET_ARM_Handle *
417 GNUNET_ARM_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
418 GNUNET_ARM_ConnectionStatusCallback conn_status, void *cls)
420 struct GNUNET_ARM_Handle *h;
422 h = GNUNET_malloc (sizeof (struct GNUNET_ARM_Handle));
423 h->cfg = GNUNET_CONFIGURATION_dup (cfg);
424 h->currently_down = GNUNET_YES;
425 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
426 h->conn_status = conn_status;
427 h->conn_status_cls = cls;
428 if (GNUNET_OK != reconnect_arm (h))
438 * Disconnect from the ARM service (if connected) and destroy the context.
440 * @param h the handle that was being used
443 GNUNET_ARM_disconnect_and_free (struct GNUNET_ARM_Handle *h)
445 LOG (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from ARM service\n");
448 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
451 clear_pending_messages (h, GNUNET_ARM_REQUEST_DISCONNECTED);
452 if (NULL != h->client)
454 GNUNET_CLIENT_disconnect (h->client);
457 if (GNUNET_SCHEDULER_NO_TASK != h->reconnect_task)
459 GNUNET_SCHEDULER_cancel (h->reconnect_task);
460 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
462 if (GNUNET_NO == h->service_test_is_active)
464 GNUNET_CONFIGURATION_destroy (h->cfg);
471 * Message timed out. Remove it from the queue.
473 * @param cls the message (struct ARMControlMessage *)
474 * @param tc task context
477 control_message_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
479 struct ARMControlMessage *cm = cls;
480 struct GNUNET_ARM_Message *arm_msg;
481 LOG (GNUNET_ERROR_TYPE_DEBUG,
482 "Control message timed out\n");
484 if ((NULL == arm_msg) || (0 == arm_msg->request_id))
486 GNUNET_CONTAINER_DLL_remove (cm->h->control_pending_head,
487 cm->h->control_pending_tail, cm);
491 GNUNET_CONTAINER_DLL_remove (cm->h->control_sent_head,
492 cm->h->control_sent_tail, cm);
494 if (NULL != cm->result_cont)
495 cm->result_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_TIMEOUT, NULL, 0);
496 else if (NULL != cm->list_cont)
497 cm->list_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_TIMEOUT, 0, NULL);
498 GNUNET_free_non_null (cm->msg);
503 #include "do_start_process.c"
507 * A client specifically requested starting of ARM itself.
508 * This function is called with information about whether
509 * or not ARM is running; if it is, report success. If
510 * it is not, start the ARM process.
512 * @param cls the context for the request that we will report on (struct ARMControlMessage *)
513 * @param tc why were we called (reason says if ARM is running)
516 arm_service_report (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
518 struct ARMControlMessage *cm = cls;
519 struct GNUNET_ARM_Handle *h;
520 struct GNUNET_OS_Process *proc;
521 unsigned char test_is_active;
528 test_is_active = cm->h->service_test_is_active;
530 /* FIXME: shouldn't we check for GNUNET_SCHEDULER_REASON_SHUTDOWN ? */
531 if ((GNUNET_YES == test_is_active) &&
532 (0 != (tc->reason & GNUNET_SCHEDULER_REASON_PREREQ_DONE)))
534 LOG (GNUNET_ERROR_TYPE_DEBUG, "Looks like `%s' is already running.\n",
535 "gnunet-service-arm");
536 /* arm is running! */
538 cm->result_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_SENT_OK, "arm", GNUNET_ARM_RESULT_IS_STARTED_ALREADY);
540 if (GNUNET_NO == test_is_active)
542 /* User disconnected & destroyed ARM handle in the middle of
543 * the service test, so we kept the handle around until now.
545 GNUNET_CONFIGURATION_destroy (cm->h->cfg);
548 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_PREREQ_DONE)) ||
549 (GNUNET_NO == test_is_active))
554 cm->h->service_test_is_active = GNUNET_NO;
555 LOG (GNUNET_ERROR_TYPE_DEBUG,
556 "Looks like `%s' is not running, will start it.\n",
557 "gnunet-service-arm");
558 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (
559 cm->h->cfg, "arm", "PREFIX", &loprefix))
560 loprefix = GNUNET_strdup ("");
561 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (
562 cm->h->cfg, "arm", "OPTIONS", &lopostfix))
563 lopostfix = GNUNET_strdup ("");
564 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (
565 cm->h->cfg, "arm", "BINARY", &cbinary))
567 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_WARNING, "arm", "BINARY");
569 cm->result_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_SENT_OK, "arm", GNUNET_ARM_RESULT_IS_NOT_KNOWN);
571 GNUNET_free (loprefix);
572 GNUNET_free (lopostfix);
575 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (
576 cm->h->cfg, "arm", "CONFIG", &config))
578 binary = GNUNET_OS_get_libexec_binary_path (cbinary);
579 GNUNET_free (cbinary);
580 if ((GNUNET_YES == GNUNET_CONFIGURATION_have_value (
581 cm->h->cfg, "TESTING", "WEAKRANDOM")) &&
582 (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (
583 cm->h->cfg, "TESTING", "WEAKRANDOM")) &&
584 (GNUNET_NO == GNUNET_CONFIGURATION_have_value (
585 cm->h->cfg, "TESTING", "HOSTFILE")))
587 /* Means we are ONLY running locally */
588 /* we're clearly running a test, don't daemonize */
590 proc = do_start_process (GNUNET_NO, cm->std_inheritance,
591 NULL, loprefix, binary,
592 /* no daemonization! */
595 proc = do_start_process (GNUNET_NO, cm->std_inheritance,
596 NULL, loprefix, binary, "-c", config,
597 /* no daemonization! */
603 proc = do_start_process (GNUNET_NO, cm->std_inheritance,
604 NULL, loprefix, binary,
605 "-d", lopostfix, NULL);
607 proc = do_start_process (GNUNET_NO, cm->std_inheritance,
608 NULL, loprefix, binary, "-c", config,
609 "-d", lopostfix, NULL);
611 GNUNET_free (binary);
612 GNUNET_free_non_null (config);
613 GNUNET_free (loprefix);
614 GNUNET_free (lopostfix);
618 cm->result_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_SENT_OK, "arm",
619 GNUNET_ARM_RESULT_START_FAILED);
624 cm->result_cont (cm->cont_cls, cm->h, GNUNET_ARM_REQUEST_SENT_OK, "arm",
625 GNUNET_ARM_RESULT_STARTING);
626 GNUNET_OS_process_destroy (proc);
634 * Start or stop a service.
636 * @param h handle to ARM
637 * @param service_name name of the service
638 * @param timeout how long to wait before failing for good
639 * @param cb callback to invoke when service is ready
640 * @param cb_cls closure for callback
641 * @param type type of the request
644 change_service (struct GNUNET_ARM_Handle *h, const char *service_name,
645 struct GNUNET_TIME_Relative timeout, GNUNET_ARM_ResultCallback cb,
646 void *cb_cls, uint16_t type)
648 struct ARMControlMessage *cm;
650 struct GNUNET_ARM_Message *msg;
652 slen = strlen (service_name) + 1;
653 if (slen + sizeof (struct GNUNET_ARM_Message) >=
654 GNUNET_SERVER_MAX_MESSAGE_SIZE)
658 cb (cb_cls, h, GNUNET_ARM_REQUEST_TOO_LONG, NULL, 0);
661 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting %s of service `%s'.\n",
662 (GNUNET_MESSAGE_TYPE_ARM_START == type) ? "start" : "termination",
664 cm = GNUNET_malloc (sizeof (struct ARMControlMessage) + slen);
666 cm->result_cont = cb;
667 cm->cont_cls = cb_cls;
668 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
669 memcpy (&cm[1], service_name, slen);
670 msg = GNUNET_malloc (sizeof (struct GNUNET_ARM_Message) + slen);
671 msg->header.size = htons (sizeof (struct GNUNET_ARM_Message) + slen);
672 msg->header.type = htons (type);
673 memcpy (&msg[1], service_name, slen);
675 LOG (GNUNET_ERROR_TYPE_DEBUG,
676 "Inserting a control message into the queue. Timeout is %llu\n",
677 GNUNET_TIME_absolute_get_remaining (cm->timeout).rel_value);
678 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
679 h->control_pending_tail, cm);
680 cm->timeout_task_id =
681 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
682 (cm->timeout), &control_message_timeout, cm);
683 trigger_next_request (h, GNUNET_NO);
688 * Request for a service to be started.
690 * @param h handle to ARM
691 * @param service_name name of the service
692 * @param std_inheritance inheritance of std streams
693 * @param timeout how long to wait before failing for good
694 * @param cont callback to invoke after request is sent or not sent
695 * @param cont_cls closure for callback
698 GNUNET_ARM_request_service_start (struct GNUNET_ARM_Handle *h,
699 const char *service_name, enum GNUNET_OS_InheritStdioFlags std_inheritance,
700 struct GNUNET_TIME_Relative timeout, GNUNET_ARM_ResultCallback cont,
703 struct ARMControlMessage *cm;
706 LOG (GNUNET_ERROR_TYPE_DEBUG,
707 "Asked to start service `%s' within %s\n", service_name,
708 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_NO));
709 if (0 == strcasecmp ("arm", service_name))
712 * 1) We're connected to ARM already. Invoke the callback immediately.
713 * 2) We're not connected to ARM.
714 * Cancel any reconnection attempts temporarily, then perform
717 if (GNUNET_NO == h->currently_down)
719 LOG (GNUNET_ERROR_TYPE_DEBUG, "ARM is already running\n");
721 cont (cont_cls, h, GNUNET_ARM_REQUEST_SENT_OK, "arm", GNUNET_ARM_RESULT_IS_STARTED_ALREADY);
723 else if (GNUNET_NO == h->service_test_is_active)
727 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
730 if (NULL != h->client)
732 GNUNET_CLIENT_disconnect (h->client);
735 if (GNUNET_SCHEDULER_NO_TASK != h->reconnect_task)
737 GNUNET_SCHEDULER_cancel (h->reconnect_task);
738 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
741 LOG (GNUNET_ERROR_TYPE_DEBUG,
742 "Not connected to ARM, will do a service test\n");
744 slen = strlen ("arm") + 1;
745 cm = GNUNET_malloc (sizeof (struct ARMControlMessage) + slen);
747 cm->result_cont = cont;
748 cm->cont_cls = cont_cls;
749 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
750 cm->std_inheritance = std_inheritance;
751 memcpy (&cm[1], service_name, slen);
752 h->service_test_is_active = GNUNET_YES;
753 GNUNET_CLIENT_service_test ("arm", h->cfg, timeout, &arm_service_report,
758 /* Service test is already running - tell user to chill out and try
761 LOG (GNUNET_ERROR_TYPE_DEBUG, "Service test is already in progress, we're busy\n");
763 cont (cont_cls, h, GNUNET_ARM_REQUEST_BUSY, NULL, 0);
767 change_service (h, service_name, timeout, cont, cont_cls,
768 GNUNET_MESSAGE_TYPE_ARM_START);
773 * Request a service to be stopped.
774 * Stopping arm itself will not invalidate its handle, and
775 * ARM API will try to restore connection to the ARM service,
776 * even if ARM connection was lost because you asked for ARM to be stopped.
777 * Call GNUNET_ARM_disconnect_and_free () to free the handle and prevent
778 * further connection attempts.
780 * @param h handle to ARM
781 * @param service_name name of the service
782 * @param timeout how long to wait before failing for good
783 * @param cont callback to invoke after request is sent or is not sent
784 * @param cont_cls closure for callback
787 GNUNET_ARM_request_service_stop (struct GNUNET_ARM_Handle *h,
788 const char *service_name, struct GNUNET_TIME_Relative timeout,
789 GNUNET_ARM_ResultCallback cont, void *cont_cls)
791 LOG (GNUNET_ERROR_TYPE_DEBUG,
792 "Stopping service `%s' within %s\n",
794 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_NO));
795 change_service (h, service_name, timeout, cont, cont_cls,
796 GNUNET_MESSAGE_TYPE_ARM_STOP);
801 * Request a list of running services.
803 * @param h handle to ARM
804 * @param timeout how long to wait before failing for good
805 * @param cont callback to invoke after request is sent or is not sent
806 * @param cont_cls closure for callback
809 GNUNET_ARM_request_service_list (struct GNUNET_ARM_Handle *h,
810 struct GNUNET_TIME_Relative timeout,
811 GNUNET_ARM_ServiceListCallback cont,
814 struct ARMControlMessage *cm;
815 struct GNUNET_ARM_Message *msg;
817 LOG (GNUNET_ERROR_TYPE_DEBUG,
818 "Requesting LIST from ARM service with timeout: %s\n",
819 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_YES));
820 cm = GNUNET_malloc (sizeof (struct ARMControlMessage));
822 cm->list_cont = cont;
823 cm->cont_cls = cont_cls;
824 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
825 msg = GNUNET_malloc (sizeof (struct GNUNET_ARM_Message));
826 msg->header.size = htons (sizeof (struct GNUNET_ARM_Message));
827 msg->header.type = htons (GNUNET_MESSAGE_TYPE_ARM_LIST);
829 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
830 h->control_pending_tail, cm);
831 cm->timeout_task_id =
832 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
833 (cm->timeout), &control_message_timeout, cm);
834 trigger_next_request (h, GNUNET_NO);
838 static struct ARMControlMessage *
839 find_cm_by_id (struct GNUNET_ARM_Handle *h, uint64_t id)
841 struct ARMControlMessage *result;
842 for (result = h->control_sent_head; result; result = result->next)
843 if (id == result->msg->request_id)
850 * Handler for ARM replies.
852 * @param cls our "struct GNUNET_ARM_Handle"
853 * @param msg the message received from the arm service
856 client_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
858 struct GNUNET_ARM_Handle *h = cls;
859 const struct GNUNET_ARM_Message *arm_msg;
860 const struct GNUNET_ARM_ResultMessage *res;
861 const struct GNUNET_ARM_ListResultMessage *lres;
862 struct ARMControlMessage *cm;
866 enum GNUNET_ARM_Result result;
875 LOG (GNUNET_ERROR_TYPE_INFO,
876 _("Client was disconnected from arm service, trying to reconnect.\n"));
877 reconnect_arm_later (h);
880 msize = ntohs (msg->size);
881 LOG (GNUNET_ERROR_TYPE_DEBUG,
882 "Processing message of type %u and size %u from arm service\n",
883 ntohs (msg->type), msize);
884 if (msize < sizeof (struct GNUNET_ARM_Message))
887 reconnect_arm_later (h);
890 arm_msg = (const struct GNUNET_ARM_Message *) msg;
891 id = GNUNET_ntohll (arm_msg->request_id);
892 cm = find_cm_by_id (h, id);
895 LOG (GNUNET_ERROR_TYPE_DEBUG, "Message with unknown id %llu\n", id);
899 switch (ntohs (msg->type))
901 case GNUNET_MESSAGE_TYPE_ARM_RESULT:
902 if (msize < sizeof (struct GNUNET_ARM_ResultMessage))
908 case GNUNET_MESSAGE_TYPE_ARM_LIST_RESULT:
909 if (msize < sizeof (struct GNUNET_ARM_ListResultMessage))
916 lres = (const struct GNUNET_ARM_ListResultMessage *) msg;
917 rcount = ntohs (lres->count);
921 list = GNUNET_malloc (sizeof (const char *) * rcount);
922 pos = (const char *)&lres[1];
923 for (i = 0; i < rcount; i++)
925 const char *end = memchr (pos, 0, msize - size_check);
933 size_check += (end - pos) + 1;
936 if (GNUNET_YES == fail)
947 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != cm->timeout_task_id);
948 GNUNET_SCHEDULER_cancel (cm->timeout_task_id);
949 GNUNET_CONTAINER_DLL_remove (h->control_sent_head,
950 h->control_sent_tail, cm);
951 if (GNUNET_YES == fail)
953 reconnect_arm_later (h);
954 GNUNET_free (cm->msg);
958 GNUNET_CLIENT_receive (h->client, &client_notify_handler, h,
959 GNUNET_TIME_UNIT_FOREVER_REL);
960 switch (ntohs (msg->type))
962 case GNUNET_MESSAGE_TYPE_ARM_RESULT:
963 res = (const struct GNUNET_ARM_ResultMessage *) msg;
964 LOG (GNUNET_ERROR_TYPE_DEBUG,
965 "Received response from ARM for service `%s': %u\n",
966 (const char *) &cm->msg[1], ntohs (msg->type));
967 result = (enum GNUNET_ARM_Result) ntohl (res->result);
968 if (NULL != cm->result_cont)
969 cm->result_cont (cm->cont_cls, h, GNUNET_ARM_REQUEST_SENT_OK,
970 (const char *) &cm->msg[1], result);
972 case GNUNET_MESSAGE_TYPE_ARM_LIST_RESULT:
973 if (NULL != cm->list_cont)
974 cm->list_cont (cm->cont_cls, h, GNUNET_ARM_REQUEST_SENT_OK, rcount,
979 GNUNET_free (cm->msg);
983 /* end of arm_api.c */