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23 * @brief API for accessing the ARM service
24 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet_arm_service.h"
30 #include "gnunet_protocols.h"
33 #define LOG(kind,...) GNUNET_log_from (kind, "arm-api",__VA_ARGS__)
36 * Handle for interacting with ARM.
38 struct GNUNET_ARM_Handle
41 * Our control connection to the ARM service.
43 struct GNUNET_CLIENT_Connection *client;
46 * The configuration that we are using.
48 struct GNUNET_CONFIGURATION_Handle *cfg;
51 * Handle for our current transmission request.
53 struct GNUNET_CLIENT_TransmitHandle *cth;
56 * Head of doubly-linked list of pending requests.
58 struct ARMControlMessage *control_pending_head;
61 * Tail of doubly-linked list of pending requests.
63 struct ARMControlMessage *control_pending_tail;
66 * Head of doubly-linked list of sent requests.
68 struct ARMControlMessage *control_sent_head;
71 * Tail of doubly-linked list of sent requests.
73 struct ARMControlMessage *control_sent_tail;
76 * Callback to invoke on connection/disconnection.
78 GNUNET_ARM_ConnectionStatusCallback conn_status;
81 * Closure for conn_status.
83 void *conn_status_cls;
86 * ARM control message for the 'arm_termination_handler'
87 * with the continuation to call once the ARM shutdown is done.
89 struct ARMControlMessage *thm;
92 * ID of the reconnect task (if any).
94 struct GNUNET_SCHEDULER_Task *reconnect_task;
97 * Current delay we use for re-trying to connect to core.
99 struct GNUNET_TIME_Relative retry_backoff;
102 * Counter for request identifiers
104 uint64_t request_id_counter;
107 * Are we currently disconnected and hence unable to send?
109 unsigned char currently_down;
112 * #GNUNET_YES if we're running a service test.
114 unsigned char service_test_is_active;
119 * Entry in a doubly-linked list of control messages to be transmitted
120 * to the arm service.
122 * The actual message is allocated at the end of this struct.
124 struct ARMControlMessage
127 * This is a doubly-linked list.
129 struct ARMControlMessage *next;
132 * This is a doubly-linked list.
134 struct ARMControlMessage *prev;
139 struct GNUNET_ARM_Handle *h;
144 struct GNUNET_ARM_Message *msg;
147 * Callback for service state change requests.
149 GNUNET_ARM_ResultCallback result_cont;
152 * Callback for service list requests.
154 GNUNET_ARM_ServiceListCallback list_cont;
157 * Closure for @e result_cont' or @e list_cont'.
162 * Timeout for the operation.
164 struct GNUNET_TIME_Absolute timeout;
167 * Task to run when request times out.
169 struct GNUNET_SCHEDULER_Task * timeout_task_id;
172 * Flags for passing std descriptors to ARM (when starting ARM).
174 enum GNUNET_OS_InheritStdioFlags std_inheritance;
177 * Type of the request expressed as a message type (start, stop or list).
186 * @param h arm handle
187 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
190 reconnect_arm (struct GNUNET_ARM_Handle *h);
194 * Check the list of pending requests, send the next
197 * @param h arm handle
198 * @param ignore_currently_down transmit message even if not initialized?
201 trigger_next_request (struct GNUNET_ARM_Handle *h, int ignore_currently_down);
205 * Task scheduled to try to re-connect to arm.
207 * @param cls the 'struct GNUNET_ARM_Handle'
210 reconnect_arm_task (void *cls)
212 struct GNUNET_ARM_Handle *h = cls;
214 h->reconnect_task = NULL;
215 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to ARM service after delay\n");
221 * Close down any existing connection to the ARM service and
222 * try re-establishing it later.
224 * @param h our handle
227 reconnect_arm_later (struct GNUNET_ARM_Handle *h)
229 if (GNUNET_NO != h->currently_down)
233 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
236 if (NULL != h->client)
238 GNUNET_CLIENT_disconnect (h->client);
241 h->currently_down = GNUNET_YES;
242 GNUNET_assert (NULL == h->reconnect_task);
244 GNUNET_SCHEDULER_add_delayed (h->retry_backoff, &reconnect_arm_task, h);
245 /* Don't clear pending messages on disconnection, deliver them later
246 clear_pending_messages (h, GNUNET_ARM_REQUEST_DISCONNECTED);
247 GNUNET_assert (NULL == h->control_pending_head);
249 h->retry_backoff = GNUNET_TIME_STD_BACKOFF (h->retry_backoff);
250 if (NULL != h->conn_status)
251 h->conn_status (h->conn_status_cls, GNUNET_NO);
256 * Find a control message by its unique ID.
258 * @param h ARM handle
259 * @param id unique message ID to use for the lookup
260 * @return NULL if not found
262 static struct ARMControlMessage *
263 find_cm_by_id (struct GNUNET_ARM_Handle *h, uint64_t id)
265 struct ARMControlMessage *result;
266 for (result = h->control_sent_head; result; result = result->next)
267 if (id == result->msg->request_id)
274 * Handler for ARM 'termination' reply (failure to receive).
276 * @param cls our "struct GNUNET_ARM_Handle"
277 * @param msg expected to be NULL
280 arm_termination_handler (void *cls, const struct GNUNET_MessageHeader *msg)
282 struct GNUNET_ARM_Handle *h = cls;
283 struct ARMControlMessage *cm;
288 GNUNET_CLIENT_receive (h->client, &arm_termination_handler, h,
289 GNUNET_TIME_UNIT_FOREVER_REL);
294 h->currently_down = GNUNET_YES;
295 GNUNET_CLIENT_disconnect (h->client);
297 if (NULL != cm->result_cont)
298 cm->result_cont (cm->cont_cls,
299 GNUNET_ARM_REQUEST_SENT_OK,
300 (const char *) &cm->msg[1],
301 GNUNET_ARM_RESULT_STOPPED);
302 GNUNET_free (cm->msg);
308 * Handler for ARM replies.
310 * @param cls our `struct GNUNET_ARM_Handle`
311 * @param msg the message received from the arm service
314 client_notify_handler (void *cls,
315 const struct GNUNET_MessageHeader *msg)
317 struct GNUNET_ARM_Handle *h = cls;
318 const struct GNUNET_ARM_Message *arm_msg;
319 const struct GNUNET_ARM_ResultMessage *res;
320 const struct GNUNET_ARM_ListResultMessage *lres;
321 struct ARMControlMessage *cm;
325 enum GNUNET_ARM_Result result;
335 LOG (GNUNET_ERROR_TYPE_INFO,
336 _("Client was disconnected from arm service, trying to reconnect.\n"));
337 reconnect_arm_later (h);
340 msize = ntohs (msg->size);
341 LOG (GNUNET_ERROR_TYPE_DEBUG,
342 "Processing message of type %u and size %u from arm service\n",
343 ntohs (msg->type), msize);
344 if (msize < sizeof (struct GNUNET_ARM_Message))
347 reconnect_arm_later (h);
350 arm_msg = (const struct GNUNET_ARM_Message *) msg;
351 GNUNET_break (0 == ntohl (arm_msg->reserved));
352 id = GNUNET_ntohll (arm_msg->request_id);
353 cm = find_cm_by_id (h, id);
356 LOG (GNUNET_ERROR_TYPE_DEBUG,
357 "Message with unknown id %llu\n",
362 switch (ntohs (msg->type))
364 case GNUNET_MESSAGE_TYPE_ARM_RESULT:
365 if (msize < sizeof (struct GNUNET_ARM_ResultMessage))
371 case GNUNET_MESSAGE_TYPE_ARM_LIST_RESULT:
372 if (msize < sizeof (struct GNUNET_ARM_ListResultMessage))
379 lres = (const struct GNUNET_ARM_ListResultMessage *) msg;
380 rcount = ntohs (lres->count);
384 list = GNUNET_malloc (sizeof (const char *) * rcount);
385 pos = (const char *)&lres[1];
386 for (i = 0; i < rcount; i++)
388 const char *end = memchr (pos, 0, msize - size_check);
396 size_check += (end - pos) + 1;
399 if (GNUNET_YES == fail)
410 GNUNET_assert (NULL != cm->timeout_task_id);
411 GNUNET_SCHEDULER_cancel (cm->timeout_task_id);
412 GNUNET_CONTAINER_DLL_remove (h->control_sent_head,
413 h->control_sent_tail, cm);
414 if (GNUNET_YES == fail)
416 reconnect_arm_later (h);
417 GNUNET_free (cm->msg);
421 if ( (GNUNET_MESSAGE_TYPE_ARM_RESULT == ntohs (msg->type)) &&
422 (0 == strcasecmp ((const char *) &cm->msg[1],
424 (NULL != (res = (const struct GNUNET_ARM_ResultMessage *) msg)) &&
425 (GNUNET_ARM_RESULT_STOPPING == ntohl (res->result)) )
427 /* special case: if we are stopping 'gnunet-service-arm', we do not just
428 wait for the result message, but also wait for the service to close
429 the connection (and then we have to close our client handle as well);
430 this is done by installing a different receive handler, waiting for
431 the connection to go down */
435 cm->result_cont (h->thm->cont_cls,
436 GNUNET_ARM_REQUEST_SENT_OK,
437 (const char *) &h->thm->msg[1],
438 GNUNET_ARM_RESULT_IS_NOT_KNOWN);
439 GNUNET_free (h->thm->msg);
440 GNUNET_free (h->thm);
443 GNUNET_CLIENT_receive (h->client, &arm_termination_handler, h,
444 GNUNET_TIME_UNIT_FOREVER_REL);
447 GNUNET_CLIENT_receive (h->client, &client_notify_handler, h,
448 GNUNET_TIME_UNIT_FOREVER_REL);
449 switch (ntohs (msg->type))
451 case GNUNET_MESSAGE_TYPE_ARM_RESULT:
452 res = (const struct GNUNET_ARM_ResultMessage *) msg;
453 LOG (GNUNET_ERROR_TYPE_DEBUG,
454 "Received response from ARM for service `%s': %u\n",
455 (const char *) &cm->msg[1], ntohs (msg->type));
456 result = (enum GNUNET_ARM_Result) ntohl (res->result);
457 if (NULL != cm->result_cont)
458 cm->result_cont (cm->cont_cls, GNUNET_ARM_REQUEST_SENT_OK,
459 (const char *) &cm->msg[1], result);
461 case GNUNET_MESSAGE_TYPE_ARM_LIST_RESULT:
462 if (NULL != cm->list_cont)
463 cm->list_cont (cm->cont_cls, GNUNET_ARM_REQUEST_SENT_OK, rcount,
465 GNUNET_free_non_null (list);
468 GNUNET_free (cm->msg);
474 * Transmit the next message to the arm service.
476 * @param cls closure with the `struct GNUNET_ARM_Handle`
477 * @param size number of bytes available in @a buf
478 * @param buf where the callee should write the message
479 * @return number of bytes written to @a buf
482 transmit_arm_message (void *cls, size_t size, void *buf)
484 struct GNUNET_ARM_Handle *h = cls;
485 struct ARMControlMessage *cm;
486 struct GNUNET_ARM_Message *arm_msg;
488 int notify_connection;
491 notify_connection = GNUNET_NO;
492 LOG (GNUNET_ERROR_TYPE_DEBUG,
493 "transmit_arm_message is running with %p buffer of size %lu. ARM is known to be %s\n",
494 buf, size, h->currently_down ? "unconnected" : "connected");
495 GNUNET_assert (NULL == h->reconnect_task);
497 if ((GNUNET_YES == h->currently_down) && (NULL != buf))
499 h->currently_down = GNUNET_NO;
500 notify_connection = GNUNET_YES;
501 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
502 GNUNET_CLIENT_receive (h->client, &client_notify_handler, h,
503 GNUNET_TIME_UNIT_FOREVER_REL);
507 LOG (GNUNET_ERROR_TYPE_DEBUG,
508 "Transmission failed, initiating reconnect\n");
509 reconnect_arm_later (h);
512 if (NULL == (cm = h->control_pending_head))
514 LOG (GNUNET_ERROR_TYPE_DEBUG,
515 "Queue is empty, not sending anything\n");
519 GNUNET_assert (NULL != cm->msg);
520 msize = ntohs (cm->msg->header.size);
523 LOG (GNUNET_ERROR_TYPE_DEBUG,
524 "Request is too big (%u < %u), not sending it\n", size, msize);
525 trigger_next_request (h, GNUNET_NO);
530 if (0 == h->request_id_counter)
531 h->request_id_counter++;
532 request_id = h->request_id_counter++;
533 LOG (GNUNET_ERROR_TYPE_DEBUG,
534 "Transmitting control message with %u bytes of type %u to arm with id %llu\n",
535 (unsigned int) msize, (unsigned int) ntohs (cm->msg->header.type), request_id);
536 arm_msg->reserved = htonl (0);
537 arm_msg->request_id = GNUNET_htonll (request_id);
538 memcpy (buf, cm->msg, msize);
539 /* Otherwise we won't be able to find it later! */
540 arm_msg->request_id = request_id;
541 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
542 h->control_pending_tail, cm);
543 GNUNET_CONTAINER_DLL_insert_tail (h->control_sent_head,
544 h->control_sent_tail, cm);
545 /* Don't free msg, keep it around (kind of wasteful, but then we don't
546 * really have many messages to handle, and it'll be freed when it times
549 trigger_next_request (h, GNUNET_NO);
552 if ((GNUNET_YES == notify_connection) && (NULL != h->conn_status))
553 h->conn_status (h->conn_status_cls, GNUNET_YES);
559 * Check the list of pending requests, send the next
562 * @param h arm handle
563 * @param ignore_currently_down transmit message even if not initialized?
566 trigger_next_request (struct GNUNET_ARM_Handle *h, int ignore_currently_down)
570 msize = sizeof (struct GNUNET_MessageHeader);
571 if ((GNUNET_YES == h->currently_down) && (ignore_currently_down == GNUNET_NO))
573 LOG (GNUNET_ERROR_TYPE_DEBUG,
574 "ARM connection down, not processing queue\n");
579 LOG (GNUNET_ERROR_TYPE_DEBUG, "Request pending, not processing queue\n");
582 if (NULL != h->control_pending_head)
584 ntohs (h->control_pending_head->msg->header.size);
585 else if (GNUNET_NO == ignore_currently_down)
587 LOG (GNUNET_ERROR_TYPE_DEBUG,
588 "Request queue empty, not processing queue\n");
589 return; /* no pending message */
592 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
593 GNUNET_TIME_UNIT_FOREVER_REL,
594 GNUNET_NO, &transmit_arm_message, h);
601 * @param h arm handle
602 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
605 reconnect_arm (struct GNUNET_ARM_Handle *h)
607 GNUNET_assert (NULL == h->client);
608 GNUNET_assert (GNUNET_YES == h->currently_down);
609 h->client = GNUNET_CLIENT_connect ("arm", h->cfg);
610 if (NULL == h->client)
612 LOG (GNUNET_ERROR_TYPE_DEBUG,
613 "arm_api, GNUNET_CLIENT_connect returned NULL\n");
614 if (NULL != h->conn_status)
615 h->conn_status (h->conn_status_cls, GNUNET_SYSERR);
616 return GNUNET_SYSERR;
618 LOG (GNUNET_ERROR_TYPE_DEBUG,
619 "arm_api, GNUNET_CLIENT_connect returned non-NULL\n");
620 trigger_next_request (h, GNUNET_YES);
626 * Set up a context for communicating with ARM, then
627 * start connecting to the ARM service using that context.
629 * @param cfg configuration to use (needed to contact ARM;
630 * the ARM service may internally use a different
631 * configuration to determine how to start the service).
632 * @param conn_status will be called when connecting/disconnecting
633 * @param cls closure for conn_status
634 * @return context to use for further ARM operations, NULL on error.
636 struct GNUNET_ARM_Handle *
637 GNUNET_ARM_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
638 GNUNET_ARM_ConnectionStatusCallback conn_status, void *cls)
640 struct GNUNET_ARM_Handle *h;
642 h = GNUNET_new (struct GNUNET_ARM_Handle);
643 h->cfg = GNUNET_CONFIGURATION_dup (cfg);
644 h->currently_down = GNUNET_YES;
645 h->reconnect_task = NULL;
646 h->conn_status = conn_status;
647 h->conn_status_cls = cls;
648 if (GNUNET_OK != reconnect_arm (h))
658 * Disconnect from the ARM service (if connected) and destroy the context.
660 * @param h the handle that was being used
663 GNUNET_ARM_disconnect_and_free (struct GNUNET_ARM_Handle *h)
665 struct ARMControlMessage *cm;
667 LOG (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from ARM service\n");
670 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
673 while ((NULL != (cm = h->control_pending_head))
674 || (NULL != (cm = h->control_sent_head)) )
676 if (NULL != h->control_pending_head)
677 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
678 h->control_pending_tail, cm);
680 GNUNET_CONTAINER_DLL_remove (h->control_sent_head,
681 h->control_sent_tail, cm);
682 GNUNET_assert (NULL != cm->timeout_task_id);
683 GNUNET_SCHEDULER_cancel (cm->timeout_task_id);
684 if (NULL != cm->result_cont)
685 cm->result_cont (cm->cont_cls, GNUNET_ARM_REQUEST_DISCONNECTED,
687 /* FIXME: What about list callback? */
688 GNUNET_free_non_null (cm->msg);
691 if (NULL != h->client)
693 GNUNET_CLIENT_disconnect (h->client);
696 if (NULL != h->reconnect_task)
698 GNUNET_SCHEDULER_cancel (h->reconnect_task);
699 h->reconnect_task = NULL;
701 if (GNUNET_NO == h->service_test_is_active)
703 GNUNET_CONFIGURATION_destroy (h->cfg);
710 * Message timed out. Remove it from the queue.
712 * @param cls the message (struct ARMControlMessage *)
715 control_message_timeout (void *cls)
717 struct ARMControlMessage *cm = cls;
718 struct GNUNET_ARM_Message *arm_msg;
720 LOG (GNUNET_ERROR_TYPE_DEBUG,
721 "Control message timed out\n");
723 if ((NULL == arm_msg) || (0 == arm_msg->request_id))
725 GNUNET_CONTAINER_DLL_remove (cm->h->control_pending_head,
726 cm->h->control_pending_tail, cm);
730 GNUNET_CONTAINER_DLL_remove (cm->h->control_sent_head,
731 cm->h->control_sent_tail, cm);
733 if (NULL != cm->result_cont)
734 cm->result_cont (cm->cont_cls, GNUNET_ARM_REQUEST_TIMEOUT, NULL, 0);
735 else if (NULL != cm->list_cont)
736 cm->list_cont (cm->cont_cls, GNUNET_ARM_REQUEST_TIMEOUT, 0, NULL);
737 GNUNET_free_non_null (cm->msg);
743 * A client specifically requested starting of ARM itself.
744 * This function is called with information about whether
745 * or not ARM is running; if it is, report success. If
746 * it is not, start the ARM process.
748 * @param cls the context for the request that we will report on (struct ARMControlMessage *)
749 * @param result #GNUNET_YES if ARM is running
752 arm_service_report (void *cls,
755 struct ARMControlMessage *cm = cls;
756 struct GNUNET_ARM_Handle *h;
757 struct GNUNET_OS_Process *proc;
758 unsigned char test_is_active;
766 test_is_active = cm->h->service_test_is_active;
767 if ((GNUNET_YES == test_is_active) &&
768 (GNUNET_YES == result))
770 LOG (GNUNET_ERROR_TYPE_DEBUG,
771 "Looks like `%s' is already running.\n",
772 "gnunet-service-arm");
773 /* arm is running! */
775 cm->result_cont (cm->cont_cls,
776 GNUNET_ARM_REQUEST_SENT_OK, "arm",
777 GNUNET_ARM_RESULT_IS_STARTED_ALREADY);
779 if (GNUNET_NO == test_is_active)
781 /* User disconnected & destroyed ARM handle in the middle of
782 * the service test, so we kept the handle around until now.
784 GNUNET_CONFIGURATION_destroy (cm->h->cfg);
787 if ((GNUNET_YES == result) ||
788 (GNUNET_NO == test_is_active))
793 cm->h->service_test_is_active = GNUNET_NO;
794 LOG (GNUNET_ERROR_TYPE_DEBUG,
795 "Looks like `%s' is not running, will start it.\n",
796 "gnunet-service-arm");
797 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (
798 cm->h->cfg, "arm", "PREFIX", &loprefix))
799 loprefix = GNUNET_strdup ("");
800 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (
801 cm->h->cfg, "arm", "OPTIONS", &lopostfix))
802 lopostfix = GNUNET_strdup ("");
804 GNUNET_CONFIGURATION_get_value_string (cm->h->cfg,
809 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_WARNING,
813 cm->result_cont (cm->cont_cls,
814 GNUNET_ARM_REQUEST_SENT_OK, "arm",
815 GNUNET_ARM_RESULT_IS_NOT_KNOWN);
817 GNUNET_free (loprefix);
818 GNUNET_free (lopostfix);
822 GNUNET_CONFIGURATION_get_value_filename (cm->h->cfg,
826 binary = GNUNET_OS_get_libexec_binary_path (cbinary);
827 GNUNET_asprintf ("edbinary,
830 GNUNET_free (cbinary);
832 GNUNET_CONFIGURATION_have_value (cm->h->cfg,
836 GNUNET_CONFIGURATION_get_value_yesno (cm->h->cfg,
840 GNUNET_CONFIGURATION_have_value (cm->h->cfg,
844 /* Means we are ONLY running locally */
845 /* we're clearly running a test, don't daemonize */
847 proc = GNUNET_OS_start_process_s (GNUNET_NO, cm->std_inheritance,
848 NULL, loprefix, quotedbinary,
849 /* no daemonization! */
852 proc = GNUNET_OS_start_process_s (GNUNET_NO, cm->std_inheritance,
853 NULL, loprefix, quotedbinary, "-c", config,
854 /* no daemonization! */
860 proc = GNUNET_OS_start_process_s (GNUNET_NO, cm->std_inheritance,
861 NULL, loprefix, quotedbinary,
862 "-d", lopostfix, NULL);
864 proc = GNUNET_OS_start_process_s (GNUNET_NO, cm->std_inheritance,
865 NULL, loprefix, quotedbinary, "-c",
867 "-d", lopostfix, NULL);
869 GNUNET_free (binary);
870 GNUNET_free (quotedbinary);
871 GNUNET_free_non_null (config);
872 GNUNET_free (loprefix);
873 GNUNET_free (lopostfix);
877 cm->result_cont (cm->cont_cls,
878 GNUNET_ARM_REQUEST_SENT_OK, "arm",
879 GNUNET_ARM_RESULT_START_FAILED);
884 cm->result_cont (cm->cont_cls,
885 GNUNET_ARM_REQUEST_SENT_OK, "arm",
886 GNUNET_ARM_RESULT_STARTING);
887 GNUNET_OS_process_destroy (proc);
895 * Start or stop a service.
897 * @param h handle to ARM
898 * @param service_name name of the service
899 * @param timeout how long to wait before failing for good
900 * @param cb callback to invoke when service is ready
901 * @param cb_cls closure for callback
902 * @param type type of the request
905 change_service (struct GNUNET_ARM_Handle *h, const char *service_name,
906 struct GNUNET_TIME_Relative timeout, GNUNET_ARM_ResultCallback cb,
907 void *cb_cls, uint16_t type)
909 struct ARMControlMessage *cm;
911 struct GNUNET_ARM_Message *msg;
913 slen = strlen (service_name) + 1;
914 if (slen + sizeof (struct GNUNET_ARM_Message) >=
915 GNUNET_SERVER_MAX_MESSAGE_SIZE)
919 cb (cb_cls, GNUNET_ARM_REQUEST_TOO_LONG, NULL, 0);
922 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting %s of service `%s'.\n",
923 (GNUNET_MESSAGE_TYPE_ARM_START == type) ? "start" : "termination",
925 cm = GNUNET_malloc (sizeof (struct ARMControlMessage) + slen);
927 cm->result_cont = cb;
928 cm->cont_cls = cb_cls;
929 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
930 memcpy (&cm[1], service_name, slen);
931 msg = GNUNET_malloc (sizeof (struct GNUNET_ARM_Message) + slen);
932 msg->header.size = htons (sizeof (struct GNUNET_ARM_Message) + slen);
933 msg->header.type = htons (type);
934 msg->reserved = htonl (0);
935 memcpy (&msg[1], service_name, slen);
937 LOG (GNUNET_ERROR_TYPE_DEBUG,
938 "Inserting a control message into the queue. Timeout is %s\n",
939 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (cm->timeout),
941 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
942 h->control_pending_tail, cm);
943 cm->timeout_task_id =
944 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
945 (cm->timeout), &control_message_timeout, cm);
946 trigger_next_request (h, GNUNET_NO);
951 * Request for a service to be started.
953 * @param h handle to ARM
954 * @param service_name name of the service
955 * @param std_inheritance inheritance of std streams
956 * @param timeout how long to wait before failing for good
957 * @param cont callback to invoke after request is sent or not sent
958 * @param cont_cls closure for callback
961 GNUNET_ARM_request_service_start (struct GNUNET_ARM_Handle *h,
962 const char *service_name,
963 enum GNUNET_OS_InheritStdioFlags std_inheritance,
964 struct GNUNET_TIME_Relative timeout,
965 GNUNET_ARM_ResultCallback cont,
968 struct ARMControlMessage *cm;
971 LOG (GNUNET_ERROR_TYPE_DEBUG,
972 "Asked to start service `%s' within %s\n", service_name,
973 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_NO));
974 if (0 == strcasecmp ("arm", service_name))
977 * 1) We're connected to ARM already. Invoke the callback immediately.
978 * 2) We're not connected to ARM.
979 * Cancel any reconnection attempts temporarily, then perform
982 if (GNUNET_NO == h->currently_down)
984 LOG (GNUNET_ERROR_TYPE_DEBUG,
985 "ARM is already running\n");
988 GNUNET_ARM_REQUEST_SENT_OK,
990 GNUNET_ARM_RESULT_IS_STARTED_ALREADY);
992 else if (GNUNET_NO == h->service_test_is_active)
996 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
999 if (NULL != h->client)
1001 GNUNET_CLIENT_disconnect (h->client);
1004 if (NULL != h->reconnect_task)
1006 GNUNET_SCHEDULER_cancel (h->reconnect_task);
1007 h->reconnect_task = NULL;
1010 LOG (GNUNET_ERROR_TYPE_DEBUG,
1011 "Not connected to ARM, will do a service test\n");
1013 slen = strlen ("arm") + 1;
1014 cm = GNUNET_malloc (sizeof (struct ARMControlMessage) + slen);
1016 cm->result_cont = cont;
1017 cm->cont_cls = cont_cls;
1018 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1019 cm->std_inheritance = std_inheritance;
1020 memcpy (&cm[1], service_name, slen);
1021 h->service_test_is_active = GNUNET_YES;
1022 GNUNET_CLIENT_service_test ("arm",
1025 &arm_service_report,
1030 /* Service test is already running - tell user to chill out and try
1033 LOG (GNUNET_ERROR_TYPE_DEBUG,
1034 "Service test is already in progress, we're busy\n");
1036 cont (cont_cls, GNUNET_ARM_REQUEST_BUSY, NULL, 0);
1040 change_service (h, service_name, timeout, cont, cont_cls,
1041 GNUNET_MESSAGE_TYPE_ARM_START);
1046 * Request a service to be stopped.
1047 * Stopping arm itself will not invalidate its handle, and
1048 * ARM API will try to restore connection to the ARM service,
1049 * even if ARM connection was lost because you asked for ARM to be stopped.
1050 * Call #GNUNET_ARM_disconnect_and_free() to free the handle and prevent
1051 * further connection attempts.
1053 * @param h handle to ARM
1054 * @param service_name name of the service
1055 * @param timeout how long to wait before failing for good
1056 * @param cont callback to invoke after request is sent or is not sent
1057 * @param cont_cls closure for callback
1060 GNUNET_ARM_request_service_stop (struct GNUNET_ARM_Handle *h,
1061 const char *service_name,
1062 struct GNUNET_TIME_Relative timeout,
1063 GNUNET_ARM_ResultCallback cont,
1066 LOG (GNUNET_ERROR_TYPE_DEBUG,
1067 "Stopping service `%s' within %s\n",
1069 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_NO));
1070 change_service (h, service_name, timeout, cont, cont_cls,
1071 GNUNET_MESSAGE_TYPE_ARM_STOP);
1076 * Request a list of running services.
1078 * @param h handle to ARM
1079 * @param timeout how long to wait before failing for good
1080 * @param cont callback to invoke after request is sent or is not sent
1081 * @param cont_cls closure for callback
1084 GNUNET_ARM_request_service_list (struct GNUNET_ARM_Handle *h,
1085 struct GNUNET_TIME_Relative timeout,
1086 GNUNET_ARM_ServiceListCallback cont,
1089 struct ARMControlMessage *cm;
1090 struct GNUNET_ARM_Message *msg;
1092 LOG (GNUNET_ERROR_TYPE_DEBUG,
1093 "Requesting LIST from ARM service with timeout: %s\n",
1094 GNUNET_STRINGS_relative_time_to_string (timeout, GNUNET_YES));
1095 cm = GNUNET_new (struct ARMControlMessage);
1097 cm->list_cont = cont;
1098 cm->cont_cls = cont_cls;
1099 cm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1100 msg = GNUNET_malloc (sizeof (struct GNUNET_ARM_Message));
1101 msg->header.size = htons (sizeof (struct GNUNET_ARM_Message));
1102 msg->header.type = htons (GNUNET_MESSAGE_TYPE_ARM_LIST);
1103 msg->reserved = htonl (0);
1105 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1106 h->control_pending_tail, cm);
1107 cm->timeout_task_id =
1108 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
1109 (cm->timeout), &control_message_timeout, cm);
1110 trigger_next_request (h, GNUNET_NO);
1114 /* end of arm_api.c */