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17 * @file core/core_api_monitor_peers.c
18 * @brief implementation of the peer_iterate function
19 * @author Christian Grothoff
20 * @author Nathan Evans
23 #include "gnunet_core_service.h"
28 * Handle to a CORE monitoring operation.
30 struct GNUNET_CORE_MonitorHandle
36 const struct GNUNET_CONFIGURATION_Handle *cfg;
39 * Our connection to the service.
41 struct GNUNET_MQ_Handle *mq;
44 * Function called with the peer.
46 GNUNET_CORE_MonitorCallback peer_cb;
49 * Closure for @e peer_cb.
57 * Protocol error, reconnect to CORE service and notify
60 * @param mh monitoring session to reconnect to CORE
63 reconnect (struct GNUNET_CORE_MonitorHandle *mh);
67 * Generic error handler, called with the appropriate error code and
68 * the same closure specified at the creation of the message queue.
69 * Not every message queue implementation supports an error handler.
71 * @param cls closure, a `struct GNUNET_CORE_MonitorHandle *`
72 * @param error error code
75 handle_mq_error (void *cls,
76 enum GNUNET_MQ_Error error)
78 struct GNUNET_CORE_MonitorHandle *mh = cls;
85 * Receive reply from CORE service with information about a peer.
87 * @param cls our `struct GNUNET_CORE_MonitorHandle *`
88 * @param mon_message monitor message
91 handle_receive_info (void *cls,
92 const struct MonitorNotifyMessage *mon_message)
94 struct GNUNET_CORE_MonitorHandle *mh = cls;
96 mh->peer_cb (mh->peer_cb_cls,
98 (enum GNUNET_CORE_KxState) ntohl (mon_message->state),
99 GNUNET_TIME_absolute_ntoh (mon_message->timeout));
104 * Protocol error, reconnect to CORE service and notify
107 * @param mh monitoring session to reconnect to CORE
110 reconnect (struct GNUNET_CORE_MonitorHandle *mh)
112 struct GNUNET_MQ_MessageHandler handlers[] = {
113 GNUNET_MQ_hd_fixed_size (receive_info,
114 GNUNET_MESSAGE_TYPE_CORE_MONITOR_NOTIFY,
115 struct MonitorNotifyMessage,
117 GNUNET_MQ_handler_end ()
119 struct GNUNET_MQ_Envelope *env;
120 struct GNUNET_MessageHeader *msg;
123 GNUNET_MQ_destroy (mh->mq);
124 /* FIXME: use backoff? */
125 mh->mq = GNUNET_CLIENT_connect (mh->cfg,
132 /* notify callback about reconnect */
133 mh->peer_cb (mh->peer_cb_cls,
135 GNUNET_CORE_KX_CORE_DISCONNECT,
136 GNUNET_TIME_UNIT_FOREVER_ABS);
137 env = GNUNET_MQ_msg (msg,
138 GNUNET_MESSAGE_TYPE_CORE_MONITOR_PEERS);
139 GNUNET_MQ_send (mh->mq,
145 * Monitor connectivity and KX status of all peers known to CORE.
146 * Calls @a peer_cb with the current status for each connected peer,
147 * and then once with NULL to indicate that all peers that are
148 * currently active have been handled. After that, the iteration
149 * continues until it is cancelled. Normal users of the CORE API are
150 * not expected to use this function. It is different in that it
151 * truly lists all connections (including those where the KX is in
152 * progress), not just those relevant to the application. This
153 * function is used by special applications for diagnostics.
155 * @param cfg configuration handle
156 * @param peer_cb function to call with the peer information
157 * @param peer_cb_cls closure for @a peer_cb
158 * @return NULL on error
160 struct GNUNET_CORE_MonitorHandle *
161 GNUNET_CORE_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
162 GNUNET_CORE_MonitorCallback peer_cb,
165 struct GNUNET_CORE_MonitorHandle *mh;
167 GNUNET_assert (NULL != peer_cb);
168 mh = GNUNET_new (struct GNUNET_CORE_MonitorHandle);
170 mh->peer_cb = peer_cb;
171 mh->peer_cb_cls = peer_cb_cls;
183 * Stop monitoring CORE activity.
185 * @param mh monitor to stop
188 GNUNET_CORE_monitor_stop (struct GNUNET_CORE_MonitorHandle *mh)
192 GNUNET_MQ_destroy (mh->mq);
199 /* end of core_api_monitor_peers.c */