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3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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21 * @file ats/ats_api_peer_change_preference.c
22 * @brief automatic transport selection API, preference management
23 * @author Christian Grothoff
24 * @author Matthias Wachs
28 * - extend API to get performance data
29 * - implement simplistic strategy based on say 'lowest latency' or strict ordering
30 * - extend API to get peer preferences, implement proportional bandwidth assignment
31 * - re-implement API against a real ATS service (!)
34 #include "gnunet_ats_service.h"
37 struct GNUNET_ATS_InformationRequestContext
41 * Our connection to the service.
43 struct GNUNET_ATS_Handle *h;
46 * Link to peer record.
48 struct AllocationRecord *ar;
54 GNUNET_ATS_PeerConfigurationInfoCallback info;
58 struct GNUNET_PeerIdentity peer;
60 GNUNET_SCHEDULER_TaskIdentifier task;
67 const struct GNUNET_SCHEDULER_TaskContext *tc)
69 struct GNUNET_ATS_InformationRequestContext *irc = cls;
72 struct GNUNET_TIME_Relative rdelay;
73 struct AllocationRecord *ar;
75 rdelay = GNUNET_TIME_UNIT_ZERO;
76 want_reserv = irc->amount;
77 ar = GNUNET_CONTAINER_multihashmap_get (irc->h->peers, &irc->peer.hashPubKey);
80 /* attempt to change preference on peer that is not connected */
81 /* FIXME: this can happen if the 'service' didn't yet tell us about
82 a new connection, fake it! */
83 irc->info (irc->info_cls,
92 got_reserv = want_reserv;
94 else if (want_reserv > 0)
97 GNUNET_BANDWIDTH_tracker_get_delay (&irc->ar->available_recv_window,
99 if (rdelay.rel_value == 0)
100 got_reserv = want_reserv;
102 got_reserv = 0; /* all or nothing */
106 GNUNET_BANDWIDTH_tracker_consume (&irc->ar->available_recv_window, got_reserv);
108 irc->info (irc->info_cls,
117 * Obtain statistics and/or change preferences for the given peer.
119 * @param h core handle
120 * @param peer identifies the peer
121 * @param amount reserve N bytes for receiving, negative
122 * amounts can be used to undo a (recent) reservation;
123 * @param preference increase incoming traffic share preference by this amount;
124 * in the absence of "amount" reservations, we use this
125 * preference value to assign proportional bandwidth shares
126 * to all connected peers
127 * @param info function to call with the resulting configuration information
128 * @param info_cls closure for info
129 * @return NULL on error
131 struct GNUNET_ATS_InformationRequestContext *
132 GNUNET_ATS_peer_change_preference (struct GNUNET_ATS_Handle *h,
133 const struct GNUNET_PeerIdentity *peer,
134 int32_t amount, uint64_t preference,
135 GNUNET_ATS_PeerConfigurationInfoCallback
136 info, void *info_cls)
138 struct GNUNET_ATS_InformationRequestContext *irc;
140 irc = GNUNET_malloc (sizeof (struct GNUNET_ATS_InformationRequestContext));
143 irc->amount = amount;
144 irc->preference = preference;
146 irc->info_cls = info_cls;
147 irc->task = GNUNET_SCHEDULER_add_now (&exec_pcp, irc);
153 * Cancel request for getting information about a peer.
154 * Note that an eventual change in preference, trust or bandwidth
155 * assignment MAY have already been committed at the time,
156 * so cancelling a request is NOT sure to undo the original
157 * request. The original request may or may not still commit.
158 * The only thing cancellation ensures is that the callback
159 * from the original request will no longer be called.
161 * @param irc context returned by the original GNUNET_ATS_peer_get_info call
164 GNUNET_ATS_peer_change_preference_cancel (struct
165 GNUNET_ATS_InformationRequestContext
168 GNUNET_SCHEDULER_cancel (irc->task);
174 /* old CORE API implementation follows for future reference */
175 struct GNUNET_ATS_InformationRequestContext
179 * Our connection to the service.
181 struct GNUNET_ATS_Handle *h;
184 * Link to control message, NULL if CM was sent.
186 struct ControlMessage *cm;
189 * Link to peer record.
191 struct PeerRecord *pr;
196 * CM was sent, remove link so we don't double-free.
198 * @param cls the 'struct GNUNET_ATS_InformationRequestContext'
199 * @param success were we successful?
202 change_preference_send_continuation (void *cls, int success)
204 struct GNUNET_ATS_InformationRequestContext *irc = cls;
211 * Obtain statistics and/or change preferences for the given peer.
213 * @param h core handle
214 * @param peer identifies the peer
215 * @param amount reserve N bytes for receiving, negative
216 * amounts can be used to undo a (recent) reservation;
217 * @param preference increase incoming traffic share preference by this amount;
218 * in the absence of "amount" reservations, we use this
219 * preference value to assign proportional bandwidth shares
220 * to all connected peers
221 * @param info function to call with the resulting configuration information
222 * @param info_cls closure for info
223 * @return NULL on error
225 struct GNUNET_ATS_InformationRequestContext *
226 GNUNET_ATS_peer_change_preference (struct GNUNET_ATS_Handle *h,
227 const struct GNUNET_PeerIdentity *peer,
228 int32_t amount, uint64_t preference,
229 GNUNET_ATS_PeerConfigurationInfoCallback
230 info, void *info_cls)
232 struct GNUNET_ATS_InformationRequestContext *irc;
233 struct PeerRecord *pr;
234 struct RequestInfoMessage *rim;
235 struct ControlMessage *cm;
237 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &peer->hashPubKey);
240 /* attempt to change preference on peer that is not connected */
244 if (pr->pcic != NULL)
246 /* second change before first one is done */
250 irc = GNUNET_malloc (sizeof (struct GNUNET_ATS_InformationRequestContext));
253 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
254 sizeof (struct RequestInfoMessage));
255 cm->cont = &change_preference_send_continuation;
258 rim = (struct RequestInfoMessage *) &cm[1];
259 rim->header.size = htons (sizeof (struct RequestInfoMessage));
260 rim->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_REQUEST_INFO);
261 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
262 rim->reserved = htonl (0);
263 rim->reserve_inbound = htonl (amount);
264 rim->preference_change = GNUNET_htonll (preference);
267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
268 "Queueing CHANGE PREFERENCE request for peer `%s' with RIM %u\n",
269 GNUNET_i2s (peer), (unsigned int) pr->rim_id);
271 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
272 h->control_pending_tail, cm);
274 pr->pcic_cls = info_cls;
275 pr->pcic_ptr = irc; /* for free'ing irc */
276 if (NULL != h->client)
277 trigger_next_request (h, GNUNET_NO);
283 * Cancel request for getting information about a peer.
284 * Note that an eventual change in preference, trust or bandwidth
285 * assignment MAY have already been committed at the time,
286 * so cancelling a request is NOT sure to undo the original
287 * request. The original request may or may not still commit.
288 * The only thing cancellation ensures is that the callback
289 * from the original request will no longer be called.
291 * @param irc context returned by the original GNUNET_ATS_peer_get_info call
294 GNUNET_ATS_peer_change_preference_cancel (struct
295 GNUNET_ATS_InformationRequestContext
298 struct GNUNET_ATS_Handle *h = irc->h;
299 struct PeerRecord *pr = irc->pr;
301 GNUNET_assert (pr->pcic_ptr == irc);
304 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
305 h->control_pending_tail, irc->cm);
306 GNUNET_free (irc->cm);
315 /* end of ats_api_peer_change_preference.c */