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3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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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;
40 * Handle for transmitting a request.
42 struct GNUNET_CLIENT_TransmitHandle *th;
45 * Function called with the peer.
47 GNUNET_CORE_ConnectEventHandler peer_cb;
52 struct GNUNET_PeerIdentity *peer;
55 * Closure for peer_cb.
63 * Receive reply from core service with information about a peer.
65 * @param cls our 'struct GNUNET_CORE_RequestContext *'
66 * @param msg NULL on error or last entry
69 receive_info (void *cls, const struct GNUNET_MessageHeader *msg)
71 struct GNUNET_CORE_RequestContext *request_context = cls;
72 const struct ConnectNotifyMessage *connect_message;
75 /* Handle last message or error case, disconnect and clean up */
77 ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
78 (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader))))
80 if (request_context->peer_cb != NULL)
81 request_context->peer_cb (request_context->cb_cls, NULL);
82 GNUNET_CLIENT_disconnect (request_context->client);
83 GNUNET_free (request_context);
87 msize = ntohs (msg->size);
88 /* Handle incorrect message type or size, disconnect and clean up */
89 if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
90 (msize < sizeof (struct ConnectNotifyMessage)))
93 if (request_context->peer_cb != NULL)
94 request_context->peer_cb (request_context->cb_cls, NULL);
95 GNUNET_CLIENT_disconnect (request_context->client);
96 GNUNET_free (request_context);
99 connect_message = (const struct ConnectNotifyMessage *) msg;
100 if (msize != sizeof (struct ConnectNotifyMessage))
103 if (request_context->peer_cb != NULL)
104 request_context->peer_cb (request_context->cb_cls, NULL);
105 GNUNET_CLIENT_disconnect (request_context->client);
106 GNUNET_free (request_context);
110 if (request_context->peer_cb != NULL)
111 request_context->peer_cb (request_context->cb_cls, &connect_message->peer);
112 GNUNET_CLIENT_receive (request_context->client, &receive_info,
113 request_context, GNUNET_TIME_UNIT_FOREVER_REL);
118 * Function called to notify a client about the socket
119 * begin ready to queue more data. "buf" will be
120 * NULL and "size" zero if the socket was closed for
121 * writing in the meantime.
124 * @param size number of bytes available in buf
125 * @param buf where the callee should write the message
126 * @return number of bytes written to buf
129 transmit_request (void *cls, size_t size, void *buf)
131 struct GNUNET_MessageHeader *msg;
132 struct GNUNET_PeerIdentity *peer = cls;
136 msize = sizeof (struct GNUNET_MessageHeader);
139 sizeof (struct GNUNET_MessageHeader) +
140 sizeof (struct GNUNET_PeerIdentity);
141 if ((size < msize) || (buf == NULL))
143 msg = (struct GNUNET_MessageHeader *) buf;
144 msg->size = htons (msize);
147 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
148 memcpy (&msg[1], peer, sizeof (struct GNUNET_PeerIdentity));
151 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
159 * Iterate over all currently connected peers.
160 * Calls peer_cb with each connected peer, and then
161 * once with NULL to indicate that all peers have
164 * @param cfg configuration to use
165 * @param peer_cb function to call with the peer information
166 * @param cb_cls closure for peer_cb
168 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
171 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
172 GNUNET_CORE_ConnectEventHandler peer_cb,
175 struct GNUNET_CORE_RequestContext *request_context;
176 struct GNUNET_CLIENT_Connection *client;
178 client = GNUNET_CLIENT_connect ("core", cfg);
180 return GNUNET_SYSERR;
181 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
182 request_context->client = client;
183 request_context->peer_cb = peer_cb;
184 request_context->cb_cls = cb_cls;
186 request_context->th =
187 GNUNET_CLIENT_notify_transmit_ready (client,
188 sizeof (struct GNUNET_MessageHeader),
189 GNUNET_TIME_UNIT_FOREVER_REL,
190 GNUNET_YES, &transmit_request, NULL);
192 GNUNET_CLIENT_receive (client, &receive_info, request_context,
193 GNUNET_TIME_UNIT_FOREVER_REL);
197 /* end of core_api_iterate_peers.c */