2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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22 * @file core/core_api_iterate_peers.c
23 * @brief implementation of the peer_iterate function
24 * @author Christian Grothoff
25 * @author Nathan Evans
28 #include "gnunet_core_service.h"
32 struct GNUNET_CORE_RequestContext
35 * Our connection to the service.
37 struct GNUNET_CLIENT_Connection *client;
41 * Handle for transmitting a request.
43 struct GNUNET_CLIENT_TransmitHandle *th;
46 * Function called with the peer.
48 GNUNET_CORE_ConnectEventHandler peer_cb;
53 struct GNUNET_PeerIdentity *peer;
56 * Closure for peer_cb.
64 * Receive reply from core service with information about a peer.
66 * @param cls our 'struct GNUNET_CORE_RequestContext *'
67 * @param msg NULL on error or last entry
70 receive_info (void *cls, const struct GNUNET_MessageHeader *msg)
72 struct GNUNET_CORE_RequestContext *request_context = cls;
73 const struct ConnectNotifyMessage *connect_message;
76 /* Handle last message or error case, disconnect and clean up */
78 ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
79 (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader))))
81 if (request_context->peer_cb != NULL)
82 request_context->peer_cb (request_context->cb_cls, NULL);
83 GNUNET_CLIENT_disconnect (request_context->client);
84 GNUNET_free (request_context);
88 msize = ntohs (msg->size);
89 /* Handle incorrect message type or size, disconnect and clean up */
90 if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
91 (msize < sizeof (struct ConnectNotifyMessage)))
94 if (request_context->peer_cb != NULL)
95 request_context->peer_cb (request_context->cb_cls, NULL);
96 GNUNET_CLIENT_disconnect (request_context->client);
97 GNUNET_free (request_context);
100 connect_message = (const struct ConnectNotifyMessage *) msg;
101 if (msize != sizeof (struct ConnectNotifyMessage))
104 if (request_context->peer_cb != NULL)
105 request_context->peer_cb (request_context->cb_cls, NULL);
106 GNUNET_CLIENT_disconnect (request_context->client);
107 GNUNET_free (request_context);
111 if (request_context->peer_cb != NULL)
112 request_context->peer_cb (request_context->cb_cls, &connect_message->peer);
113 GNUNET_CLIENT_receive (request_context->client, &receive_info,
114 request_context, GNUNET_TIME_UNIT_FOREVER_REL);
119 * Function called to notify a client about the socket
120 * begin ready to queue more data. "buf" will be
121 * NULL and "size" zero if the socket was closed for
122 * writing in the meantime.
124 * @param cls closure, always NULL
125 * @param size number of bytes available in buf
126 * @param buf where the callee should write the message
127 * @return number of bytes written to buf
130 transmit_request (void *cls, size_t size, void *buf)
132 struct GNUNET_MessageHeader *msg;
135 msize = sizeof (struct GNUNET_MessageHeader);
136 if ((size < msize) || (buf == NULL))
138 msg = (struct GNUNET_MessageHeader *) buf;
139 msg->size = htons (msize);
140 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
147 * Iterate over all currently connected peers.
148 * Calls peer_cb with each connected peer, and then
149 * once with NULL to indicate that all peers have
152 * @param cfg configuration to use
153 * @param peer_cb function to call with the peer information
154 * @param cb_cls closure for @a peer_cb
155 * @return #GNUNET_OK if iterating, #GNUNET_SYSERR on error
158 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
159 GNUNET_CORE_ConnectEventHandler peer_cb,
162 struct GNUNET_CORE_RequestContext *request_context;
163 struct GNUNET_CLIENT_Connection *client;
165 client = GNUNET_CLIENT_connect ("core", cfg);
167 return GNUNET_SYSERR;
168 request_context = GNUNET_new (struct GNUNET_CORE_RequestContext);
169 request_context->client = client;
170 request_context->peer_cb = peer_cb;
171 request_context->cb_cls = cb_cls;
173 request_context->th =
174 GNUNET_CLIENT_notify_transmit_ready (client,
175 sizeof (struct GNUNET_MessageHeader),
176 GNUNET_TIME_UNIT_FOREVER_REL,
177 GNUNET_YES, &transmit_request, NULL);
179 GNUNET_CLIENT_receive (client, &receive_info, request_context,
180 GNUNET_TIME_UNIT_FOREVER_REL);
184 /* end of core_api_iterate_peers.c */