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20 * @file arm/arm_monitor_api.c
21 * @brief API for monitoring the ARM service
22 * @author Christian Grothoff
26 #include "gnunet_arm_service.h"
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
31 #define INIT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
33 #define LOG(kind,...) GNUNET_log_from (kind, "arm-monitor-api",__VA_ARGS__)
36 * Handle for interacting with ARM.
38 struct GNUNET_ARM_MonitorHandle
42 * Our control connection to the ARM service.
44 struct GNUNET_MQ_Handle *mq;
47 * The configuration that we are using.
49 const struct GNUNET_CONFIGURATION_Handle *cfg;
52 * ID of the reconnect task (if any).
54 struct GNUNET_SCHEDULER_Task *reconnect_task;
57 * Current delay we use for re-trying to connect to core.
59 struct GNUNET_TIME_Relative retry_backoff;
62 * Callback to invoke on status updates.
64 GNUNET_ARM_ServiceStatusCallback service_status;
67 * Closure for @e service_status.
69 void *service_status_cls;
75 * Connect to the ARM service for monitoring.
77 * @param h handle to connect
78 * @return #GNUNET_OK on success
81 reconnect_arm_monitor (struct GNUNET_ARM_MonitorHandle *h);
85 * Task scheduled to try to re-connect to arm.
87 * @param cls the `struct GNUNET_ARM_MonitorHandle`
90 reconnect_arm_monitor_task (void *cls)
92 struct GNUNET_ARM_MonitorHandle *h = cls;
94 h->reconnect_task = NULL;
95 LOG (GNUNET_ERROR_TYPE_DEBUG,
96 "Connecting to ARM service for monitoring after delay\n");
97 GNUNET_break (GNUNET_OK == reconnect_arm_monitor (h));
102 * Close down any existing connection to the ARM service and
103 * try re-establishing it later.
105 * @param h our handle
108 reconnect_arm_monitor_later (struct GNUNET_ARM_MonitorHandle *h)
112 GNUNET_MQ_destroy (h->mq);
115 GNUNET_assert (NULL == h->reconnect_task);
117 = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
118 &reconnect_arm_monitor_task, h);
119 h->retry_backoff = GNUNET_TIME_STD_BACKOFF (h->retry_backoff);
124 * Check notification messages received from ARM is well-formed.
126 * @param cls our `struct GNUNET_ARM_MonitorHandle`
127 * @param msg the message received from the arm service
128 * @return #GNUNET_OK if the message is well-formed
131 check_monitor_notify (void *cls,
132 const struct GNUNET_ARM_StatusMessage *msg)
134 size_t sl = ntohs (msg->header.size) - sizeof (struct GNUNET_ARM_StatusMessage);
135 const char *name = (const char *) &msg[1];
138 ('\0' != name[sl-1]) )
141 return GNUNET_SYSERR;
148 * Handler for notification messages received from ARM.
150 * @param cls our `struct GNUNET_ARM_MonitorHandle`
151 * @param res the message received from the arm service
154 handle_monitor_notify (void *cls,
155 const struct GNUNET_ARM_StatusMessage *res)
157 struct GNUNET_ARM_MonitorHandle *h = cls;
158 enum GNUNET_ARM_ServiceStatus status;
160 status = (enum GNUNET_ARM_ServiceStatus) ntohl (res->status);
161 LOG (GNUNET_ERROR_TYPE_DEBUG,
162 "Received notification from ARM for service `%s' with status %d\n",
163 (const char *) &res[1],
165 if (NULL != h->service_status)
166 h->service_status (h->service_status_cls,
167 (const char *) &res[1],
173 * Generic error handler, called with the appropriate error code and
174 * the same closure specified at the creation of the message queue.
175 * Not every message queue implementation supports an error handler.
177 * @param cls closure with the `struct GNUNET_ARM_MonitorHandle *`
178 * @param error error code
181 mq_error_handler (void *cls,
182 enum GNUNET_MQ_Error error)
184 struct GNUNET_ARM_MonitorHandle *h = cls;
186 reconnect_arm_monitor_later (h);
191 * Connect to the ARM service for monitoring.
193 * @param h handle to connect
194 * @return #GNUNET_OK on success
197 reconnect_arm_monitor (struct GNUNET_ARM_MonitorHandle *h)
199 struct GNUNET_MQ_MessageHandler handlers[] = {
200 GNUNET_MQ_hd_var_size (monitor_notify,
201 GNUNET_MESSAGE_TYPE_ARM_STATUS,
202 struct GNUNET_ARM_StatusMessage,
204 GNUNET_MQ_handler_end ()
206 struct GNUNET_MessageHeader *msg;
207 struct GNUNET_MQ_Envelope *env;
209 GNUNET_assert (NULL == h->mq);
210 h->mq = GNUNET_CLIENT_connect (h->cfg,
217 if (NULL != h->service_status)
218 h->service_status (h->service_status_cls,
220 GNUNET_ARM_SERVICE_STOPPED);
221 return GNUNET_SYSERR;
223 env = GNUNET_MQ_msg (msg,
224 GNUNET_MESSAGE_TYPE_ARM_MONITOR);
225 GNUNET_MQ_send (h->mq,
232 * Setup a context for monitoring ARM, then
233 * start connecting to the ARM service for monitoring using that context.
235 * @param cfg configuration to use (needed to contact ARM;
236 * the ARM service may internally use a different
237 * configuration to determine how to start the service).
238 * @param cont callback to invoke on status updates
239 * @param cont_cls closure for @a cont
240 * @return context to use for further ARM monitor operations, NULL on error.
242 struct GNUNET_ARM_MonitorHandle *
243 GNUNET_ARM_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
244 GNUNET_ARM_ServiceStatusCallback cont,
247 struct GNUNET_ARM_MonitorHandle *h;
249 h = GNUNET_new (struct GNUNET_ARM_MonitorHandle);
251 h->service_status = cont;
252 h->service_status_cls = cont_cls;
253 if (GNUNET_OK != reconnect_arm_monitor (h))
263 * Disconnect from the ARM service (if connected) and destroy the context.
265 * @param h the handle that was being used
268 GNUNET_ARM_monitor_stop (struct GNUNET_ARM_MonitorHandle *h)
272 GNUNET_MQ_destroy (h->mq);
275 if (NULL != h->reconnect_task)
277 GNUNET_SCHEDULER_cancel (h->reconnect_task);
278 h->reconnect_task = NULL;
284 /* end of arm_api.c */