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3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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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, NULL, 0);
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, NULL, 0);
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, NULL, 0);
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,
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.
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;
133 struct GNUNET_PeerIdentity *peer = cls;
137 msize = sizeof (struct GNUNET_MessageHeader);
140 sizeof (struct GNUNET_MessageHeader) +
141 sizeof (struct GNUNET_PeerIdentity);
142 if ((size < msize) || (buf == NULL))
144 msg = (struct GNUNET_MessageHeader *) buf;
145 msg->size = htons (msize);
148 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
149 memcpy (&msg[1], peer, sizeof (struct GNUNET_PeerIdentity));
152 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
160 * Iterate over all currently connected peers.
161 * Calls peer_cb with each connected peer, and then
162 * once with NULL to indicate that all peers have
165 * @param cfg configuration to use
166 * @param peer_cb function to call with the peer information
167 * @param cb_cls closure for peer_cb
169 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
172 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
173 GNUNET_CORE_ConnectEventHandler peer_cb,
176 struct GNUNET_CORE_RequestContext *request_context;
177 struct GNUNET_CLIENT_Connection *client;
179 client = GNUNET_CLIENT_connect ("core", cfg);
181 return GNUNET_SYSERR;
182 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
183 request_context->client = client;
184 request_context->peer_cb = peer_cb;
185 request_context->cb_cls = cb_cls;
187 request_context->th =
188 GNUNET_CLIENT_notify_transmit_ready (client,
189 sizeof (struct GNUNET_MessageHeader),
190 GNUNET_TIME_UNIT_FOREVER_REL,
191 GNUNET_YES, &transmit_request, NULL);
193 GNUNET_CLIENT_receive (client, &receive_info, request_context,
194 GNUNET_TIME_UNIT_FOREVER_REL);
198 /* end of core_api_iterate_peers.c */