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22 * @file core/core_api_monitor_peers.c
23 * @brief implementation of the peer_iterate function
24 * @author Christian Grothoff
25 * @author Nathan Evans
28 #include "gnunet_core_service.h"
33 * Handle to a CORE monitoring operation.
35 struct GNUNET_CORE_MonitorHandle
41 const struct GNUNET_CONFIGURATION_Handle *cfg;
44 * Our connection to the service.
46 struct GNUNET_MQ_Handle *mq;
49 * Function called with the peer.
51 GNUNET_CORE_MonitorCallback peer_cb;
54 * Closure for @e peer_cb.
62 * Protocol error, reconnect to CORE service and notify
65 * @param mh monitoring session to reconnect to CORE
68 reconnect (struct GNUNET_CORE_MonitorHandle *mh);
72 * Generic error handler, called with the appropriate error code and
73 * the same closure specified at the creation of the message queue.
74 * Not every message queue implementation supports an error handler.
76 * @param cls closure, a `struct GNUNET_CORE_MonitorHandle *`
77 * @param error error code
80 handle_mq_error (void *cls,
81 enum GNUNET_MQ_Error error)
83 struct GNUNET_CORE_MonitorHandle *mh = cls;
90 * Receive reply from CORE service with information about a peer.
92 * @param cls our `struct GNUNET_CORE_MonitorHandle *`
93 * @param mon_message monitor message
96 handle_receive_info (void *cls,
97 const struct MonitorNotifyMessage *mon_message)
99 struct GNUNET_CORE_MonitorHandle *mh = cls;
101 mh->peer_cb (mh->peer_cb_cls,
103 (enum GNUNET_CORE_KxState) ntohl (mon_message->state),
104 GNUNET_TIME_absolute_ntoh (mon_message->timeout));
109 * Protocol error, reconnect to CORE service and notify
112 * @param mh monitoring session to reconnect to CORE
115 reconnect (struct GNUNET_CORE_MonitorHandle *mh)
117 struct GNUNET_MQ_MessageHandler handlers[] = {
118 GNUNET_MQ_hd_fixed_size (receive_info,
119 GNUNET_MESSAGE_TYPE_CORE_MONITOR_NOTIFY,
120 struct MonitorNotifyMessage,
122 GNUNET_MQ_handler_end ()
124 struct GNUNET_MQ_Envelope *env;
125 struct GNUNET_MessageHeader *msg;
128 GNUNET_MQ_destroy (mh->mq);
129 /* FIXME: use backoff? */
130 mh->mq = GNUNET_CLIENT_connecT (mh->cfg,
137 /* notify callback about reconnect */
138 mh->peer_cb (mh->peer_cb_cls,
140 GNUNET_CORE_KX_CORE_DISCONNECT,
141 GNUNET_TIME_UNIT_FOREVER_ABS);
142 env = GNUNET_MQ_msg (msg,
143 GNUNET_MESSAGE_TYPE_CORE_MONITOR_PEERS);
144 GNUNET_MQ_send (mh->mq,
150 * Monitor connectivity and KX status of all peers known to CORE.
151 * Calls @a peer_cb with the current status for each connected peer,
152 * and then once with NULL to indicate that all peers that are
153 * currently active have been handled. After that, the iteration
154 * continues until it is cancelled. Normal users of the CORE API are
155 * not expected to use this function. It is different in that it
156 * truly lists all connections (including those where the KX is in
157 * progress), not just those relevant to the application. This
158 * function is used by special applications for diagnostics.
160 * @param cfg configuration handle
161 * @param peer_cb function to call with the peer information
162 * @param peer_cb_cls closure for @a peer_cb
163 * @return NULL on error
165 struct GNUNET_CORE_MonitorHandle *
166 GNUNET_CORE_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
167 GNUNET_CORE_MonitorCallback peer_cb,
170 struct GNUNET_CORE_MonitorHandle *mh;
172 GNUNET_assert (NULL != peer_cb);
173 mh = GNUNET_new (struct GNUNET_CORE_MonitorHandle);
175 mh->peer_cb = peer_cb;
176 mh->peer_cb_cls = peer_cb_cls;
188 * Stop monitoring CORE activity.
190 * @param mh monitor to stop
193 GNUNET_CORE_monitor_stop (struct GNUNET_CORE_MonitorHandle *mh)
197 GNUNET_MQ_destroy (mh->mq);
204 /* end of core_api_monitor_peers.c */