2 This file is part of GNUnet.
3 Copyright (C) 2009-2014, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 * @file core/core_api_monitor_peers.c
21 * @brief implementation of the peer_iterate function
22 * @author Christian Grothoff
23 * @author Nathan Evans
26 #include "gnunet_core_service.h"
31 * Handle to a CORE monitoring operation.
33 struct GNUNET_CORE_MonitorHandle
39 const struct GNUNET_CONFIGURATION_Handle *cfg;
42 * Our connection to the service.
44 struct GNUNET_MQ_Handle *mq;
47 * Function called with the peer.
49 GNUNET_CORE_MonitorCallback peer_cb;
52 * Closure for @e peer_cb.
60 * Protocol error, reconnect to CORE service and notify
63 * @param mh monitoring session to reconnect to CORE
66 reconnect (struct GNUNET_CORE_MonitorHandle *mh);
70 * Generic error handler, called with the appropriate error code and
71 * the same closure specified at the creation of the message queue.
72 * Not every message queue implementation supports an error handler.
74 * @param cls closure, a `struct GNUNET_CORE_MonitorHandle *`
75 * @param error error code
78 handle_mq_error (void *cls,
79 enum GNUNET_MQ_Error error)
81 struct GNUNET_CORE_MonitorHandle *mh = cls;
88 * Receive reply from CORE service with information about a peer.
90 * @param cls our `struct GNUNET_CORE_MonitorHandle *`
91 * @param mon_message monitor message
94 handle_receive_info (void *cls,
95 const struct MonitorNotifyMessage *mon_message)
97 struct GNUNET_CORE_MonitorHandle *mh = cls;
99 mh->peer_cb (mh->peer_cb_cls,
101 (enum GNUNET_CORE_KxState) ntohl (mon_message->state),
102 GNUNET_TIME_absolute_ntoh (mon_message->timeout));
107 * Protocol error, reconnect to CORE service and notify
110 * @param mh monitoring session to reconnect to CORE
113 reconnect (struct GNUNET_CORE_MonitorHandle *mh)
115 struct GNUNET_MQ_MessageHandler handlers[] = {
116 GNUNET_MQ_hd_fixed_size (receive_info,
117 GNUNET_MESSAGE_TYPE_CORE_MONITOR_NOTIFY,
118 struct MonitorNotifyMessage,
120 GNUNET_MQ_handler_end ()
122 struct GNUNET_MQ_Envelope *env;
123 struct GNUNET_MessageHeader *msg;
126 GNUNET_MQ_destroy (mh->mq);
127 /* FIXME: use backoff? */
128 mh->mq = GNUNET_CLIENT_connect (mh->cfg,
135 /* notify callback about reconnect */
136 mh->peer_cb (mh->peer_cb_cls,
138 GNUNET_CORE_KX_CORE_DISCONNECT,
139 GNUNET_TIME_UNIT_FOREVER_ABS);
140 env = GNUNET_MQ_msg (msg,
141 GNUNET_MESSAGE_TYPE_CORE_MONITOR_PEERS);
142 GNUNET_MQ_send (mh->mq,
148 * Monitor connectivity and KX status of all peers known to CORE.
149 * Calls @a peer_cb with the current status for each connected peer,
150 * and then once with NULL to indicate that all peers that are
151 * currently active have been handled. After that, the iteration
152 * continues until it is cancelled. Normal users of the CORE API are
153 * not expected to use this function. It is different in that it
154 * truly lists all connections (including those where the KX is in
155 * progress), not just those relevant to the application. This
156 * function is used by special applications for diagnostics.
158 * @param cfg configuration handle
159 * @param peer_cb function to call with the peer information
160 * @param peer_cb_cls closure for @a peer_cb
161 * @return NULL on error
163 struct GNUNET_CORE_MonitorHandle *
164 GNUNET_CORE_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
165 GNUNET_CORE_MonitorCallback peer_cb,
168 struct GNUNET_CORE_MonitorHandle *mh;
170 GNUNET_assert (NULL != peer_cb);
171 mh = GNUNET_new (struct GNUNET_CORE_MonitorHandle);
173 mh->peer_cb = peer_cb;
174 mh->peer_cb_cls = peer_cb_cls;
186 * Stop monitoring CORE activity.
188 * @param mh monitor to stop
191 GNUNET_CORE_monitor_stop (struct GNUNET_CORE_MonitorHandle *mh)
195 GNUNET_MQ_destroy (mh->mq);
202 /* end of core_api_monitor_peers.c */