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
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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_peer_request.c
23 * @brief implementation of the peer_request functions
24 * @author Christian Grothoff
27 #include "gnunet_core_service.h"
32 * Handle for a request to the core to connect to
33 * a particular peer. Can be used to cancel the request
34 * (before the 'cont'inuation is called).
36 struct GNUNET_CORE_PeerRequestHandle
40 * Our connection to the service.
42 struct GNUNET_CLIENT_Connection *client;
46 * Function to call once done.
48 GNUNET_SCHEDULER_Task cont;
58 struct GNUNET_TIME_Absolute timeout;
61 * Identity of the peer to connect to.
63 struct GNUNET_PeerIdentity peer;
66 * Message type to use.
73 * Transmit the request to the core service.
75 * @param cls our 'struct GNUNET_CORE_PeerRequestHandle'
76 * @param size number of bytes available in buf
77 * @param buf where the callee should write the message
78 * @return number of bytes written to buf
81 send_request (void *cls,
85 struct GNUNET_CORE_PeerRequestHandle * prh = cls;
86 struct ConnectMessage msg;
90 if (prh->cont != NULL)
91 GNUNET_SCHEDULER_add_continuation (prh->cont,
93 GNUNET_SCHEDULER_REASON_TIMEOUT);
94 GNUNET_CLIENT_disconnect (prh->client, GNUNET_NO);
98 GNUNET_assert (size >= sizeof (struct ConnectMessage));
99 msg.header.type = htons (prh->type);
100 msg.header.size = htons (sizeof (struct ConnectMessage));
101 msg.reserved = htonl (0);
102 msg.timeout = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (prh->timeout));
103 msg.peer = prh->peer;
104 memcpy (buf, &msg, sizeof (msg));
105 if (prh->cont != NULL)
107 GNUNET_SCHEDULER_add_continuation (prh->cont,
109 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
111 GNUNET_CLIENT_disconnect (prh->client, GNUNET_YES);
118 * Request that the core should try to connect to a particular peer.
119 * Once the request has been transmitted to the core, the continuation
120 * function will be called. Note that this does NOT mean that a
121 * connection was successfully established -- it only means that the
122 * core will now try. Successful establishment of the connection
123 * will be signalled to the 'connects' callback argument of
124 * 'GNUNET_CORE_connect' only. If the core service does not respond
125 * to our connection attempt within the given time frame, 'cont' will
126 * be called with the TIMEOUT reason code.
128 * @param cfg configuration to use
129 * @param timeout how long to try to talk to core
130 * @param peer who should we connect to
131 * @param cont function to call once the request has been completed (or timed out)
132 * @param cont_cls closure for cont
133 * @return NULL on error (cont will not be called), otherwise handle for cancellation
135 struct GNUNET_CORE_PeerRequestHandle *
136 GNUNET_CORE_peer_request_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
137 struct GNUNET_TIME_Relative timeout,
138 const struct GNUNET_PeerIdentity * peer,
139 GNUNET_SCHEDULER_Task cont,
142 struct GNUNET_CORE_PeerRequestHandle *ret;
143 struct GNUNET_CLIENT_Connection *client;
145 client = GNUNET_CLIENT_connect ("core", cfg);
148 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
149 ret->client = client;
151 ret->cont_cls = cont_cls;
153 ret->type = GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT;
154 ret->timeout = GNUNET_TIME_relative_to_absolute (timeout);
155 GNUNET_CLIENT_notify_transmit_ready (client,
156 sizeof (struct ConnectMessage),
166 * Cancel a pending request to connect to a particular peer. Must not
167 * be called after the 'cont' function was invoked.
169 * @param req request handle that was returned for the original request
172 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
174 GNUNET_CLIENT_disconnect (req->client, GNUNET_NO);
179 /* end of core_api_peer_request.c */