2 This file is part of GNUnet.
3 (C) 2011 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 fs/gnunet-service-fs_pe.c
23 * @brief API to manage query plan
24 * @author Christian Grothoff
27 #include "gnunet-service-fs.h"
28 #include "gnunet-service-fs_cp.h"
29 #include "gnunet-service-fs_pe.h"
30 #include "gnunet-service-fs_pr.h"
34 * Information we keep per request per peer. This is a doubly-linked
35 * list (with head and tail in the 'struct GSF_PendingRequestData')
36 * with one entry in each heap of each 'struct PeerPlan'. Each
37 * entry tracks information relevant for this request and this peer.
39 struct GSF_RequestPlan
43 * This is a doubly-linked list.
45 struct GSF_RequestPlan *next;
48 * This is a doubly-linked list.
50 struct GSF_RequestPlan *prev;
53 * Heap node associated with this request and this peer.
55 struct GNUNET_CONTAINER_HeapNode *hn;
58 * Associated pending request.
60 struct GSF_PendingRequest *pr;
63 * Earliest time we'd be happy to (re)transmit this request.
65 struct GNUNET_TIME_Absolute earliest_transmission;
68 * When was the last time we transmitted this request to this peer? 0 for never.
70 struct GNUNET_TIME_Absolute last_transmission;
73 * Current priority for this request for this target.
78 * How often did we transmit this request to this peer?
80 unsigned int transmission_counter;
86 * Transmission plan for a peer.
91 * Heap with pending queries (struct GSF_RequestPlan), higher weights mean higher priority.
93 struct GNUNET_CONTAINER_Heap *priority_heap;
96 * Heap with pending queries (struct GSF_RequestPlan), by transmission time, lowest first.
98 struct GNUNET_CONTAINER_Heap *delay_heap;
101 * Current transmission request handle.
103 struct GSF_PeerTransmitHandle *pth;
106 * Peer for which this is the plan.
108 struct GSF_ConnectedPeer *cp;
111 * Current task for executing the plan.
113 GNUNET_SCHEDULER_TaskIdentifier task;
118 * Hash map from peer identities to PeerPlans.
120 static struct GNUNET_CONTAINER_MultiHashMap *plans;
124 * Insert the given request plan into the heap with the appropriate weight.
126 * @param pp associated peer's plan
127 * @param rp request to plan
130 plan (struct PeerPlan *pp,
131 struct GSF_RequestPlan *rp)
133 struct GSF_PendingRequestData *prd;
135 prd = GSF_pending_request_get_data_ (rp->pr);
136 // FIXME: calculate 'rp->earliest_transmission'!
137 // fIXME: claculate 'rp->priority'!
139 if (GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission).rel_value == 0)
140 rp->hn = GNUNET_CONTAINER_heap_insert (pp->priority_heap,
144 rp->hn = GNUNET_CONTAINER_heap_insert (pp->delay_heap,
146 rp->earliest_transmission.abs_value);
151 * Figure out when and how to transmit to the given peer.
153 * @param cls the 'struct GSF_ConnectedPeer' for transmission
154 * @param tc scheduler context
157 schedule_peer_transmission (void *cls,
158 const struct GNUNET_SCHEDULER_TaskContext *tc);
162 * Function called to get a message for transmission.
165 * @param buf_size number of bytes available in buf
166 * @param buf where to copy the message, NULL on error (peer disconnect)
167 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
170 transmit_message_callback (void *cls,
174 struct PeerPlan *pp = cls;
175 struct GSF_RequestPlan *rp;
181 /* failed, try again... */
182 pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
185 rp = GNUNET_CONTAINER_heap_peek (pp->priority_heap);
188 pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
191 msize = GSF_pending_request_get_message_ (rp->pr, buf_size, buf);
192 if (msize > buf_size)
194 /* buffer to small (message changed), try again */
195 pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
198 /* remove from root, add again elsewhere... */
199 GNUNET_assert (rp == GNUNET_CONTAINER_heap_remove_root (pp->priority_heap));
201 rp->last_transmission = GNUNET_TIME_absolute_get ();
202 rp->transmission_counter++;
209 * Figure out when and how to transmit to the given peer.
211 * @param cls the 'struct PeerPlan'
212 * @param tc scheduler context
215 schedule_peer_transmission (void *cls,
216 const struct GNUNET_SCHEDULER_TaskContext *tc)
218 struct PeerPlan *pp = cls;
219 struct GSF_RequestPlan *rp;
220 struct GSF_PendingRequestData *prd;
223 pp->task = GNUNET_SCHEDULER_NO_TASK;
224 GNUNET_assert (NULL == pp->pth);
225 /* move ready requests to priority queue */
226 while ( (NULL != (rp = GNUNET_CONTAINER_heap_peek (pp->delay_heap))) &&
227 (GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission).rel_value == 0) )
229 rp = GNUNET_CONTAINER_heap_remove_root (pp->delay_heap);
230 rp->hn = GNUNET_CONTAINER_heap_insert (pp->priority_heap,
233 if (NULL == (rp = GNUNET_CONTAINER_heap_peek (pp->delay_heap)))
236 if (0 == GNUNET_CONTAINER_heap_get_size (pp->priority_heap))
238 /* priority heap (still) empty, check for delay... */
239 rp = GNUNET_CONTAINER_heap_peek (pp->delay_heap);
241 return; /* both queues empty */
242 pp->task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission),
243 &schedule_peer_transmission,
247 /* process from priority heap */
248 rp = GNUNET_CONTAINER_heap_peek (pp->priority_heap);
249 GNUNET_assert (NULL != rp);
250 prd = GSF_pending_request_get_data_ (rp->pr);
251 msize = GSF_pending_request_get_message_ (rp->pr, 0, NULL);
252 pp->pth = GSF_peer_transmit_ (pp->cp,
255 GNUNET_TIME_UNIT_FOREVER_REL,
257 &transmit_message_callback,
259 GNUNET_assert (NULL != pp->pth);
264 * Create a new query plan entry.
266 * @param cp peer with the entry
267 * @param pr request with the entry
270 GSF_plan_add_ (struct GSF_ConnectedPeer *cp,
271 struct GSF_PendingRequest *pr)
273 struct GNUNET_PeerIdentity id;
275 struct GSF_PendingRequestData *prd;
276 struct GSF_RequestPlan *rp;
278 GSF_connected_peer_get_identity_ (cp, &id);
279 pp = GNUNET_CONTAINER_multihashmap_get (plans,
283 pp = GNUNET_malloc (sizeof (struct PeerPlan));
284 pp->priority_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MAX);
285 pp->delay_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
287 GNUNET_CONTAINER_multihashmap_put (plans,
290 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
292 prd = GSF_pending_request_get_data_ (pr);
293 rp = GNUNET_malloc (sizeof (struct GSF_RequestPlan));
295 GNUNET_CONTAINER_DLL_insert (prd->rp_head,
299 if (0 == GNUNET_CONTAINER_heap_get_size (pp->priority_heap))
301 /* no request that should be done immediately, figure out delay */
302 if (rp != GNUNET_CONTAINER_heap_peek (pp->delay_heap))
303 return; /* did not change delay heap top, no need to do anything */
304 GNUNET_assert (NULL == pp->pth);
305 if (GNUNET_SCHEDULER_NO_TASK != pp->task)
306 GNUNET_SCHEDULER_cancel (pp->task);
307 pp->task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission),
308 &schedule_peer_transmission,
315 if (rp != GNUNET_CONTAINER_heap_peek (pp->priority_heap))
316 return; /* did not change priority heap top, no need to do anyhing */
317 GSF_peer_transmit_cancel_ (pp->pth);
320 if (GNUNET_SCHEDULER_NO_TASK != pp->task)
321 GNUNET_SCHEDULER_cancel (pp->task);
322 pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission,
328 * Notify the plan about a peer being no longer available;
329 * destroy all entries associated with this peer.
331 * @param cp connected peer
334 GSF_plan_notify_peer_disconnect_ (const struct GSF_ConnectedPeer *cp)
336 struct GNUNET_PeerIdentity id;
338 struct GSF_RequestPlan *rp;
339 struct GSF_PendingRequestData *prd;
341 GSF_connected_peer_get_identity_ (cp, &id);
342 pp = GNUNET_CONTAINER_multihashmap_get (plans,
345 return; /* nothing was ever planned for this peer */
346 GNUNET_CONTAINER_multihashmap_remove (plans,
350 GSF_peer_transmit_cancel_ (pp->pth);
351 if (GNUNET_SCHEDULER_NO_TASK != pp->task)
352 GNUNET_SCHEDULER_cancel (pp->task);
353 while (NULL != (rp = GNUNET_CONTAINER_heap_remove_root (pp->priority_heap)))
355 prd = GSF_pending_request_get_data_ (rp->pr);
356 GNUNET_CONTAINER_DLL_remove (prd->rp_head,
361 GNUNET_CONTAINER_heap_destroy (pp->priority_heap);
362 while (NULL != (rp = GNUNET_CONTAINER_heap_remove_root (pp->delay_heap)))
364 prd = GSF_pending_request_get_data_ (rp->pr);
365 GNUNET_CONTAINER_DLL_remove (prd->rp_head,
370 GNUNET_CONTAINER_heap_destroy (pp->delay_heap);
376 * Notify the plan about a request being done; destroy all entries
377 * associated with this request.
379 * @param pr request that is done
382 GSF_plan_notify_request_done_ (struct GSF_PendingRequest *pr)
384 struct GSF_RequestPlan *rp;
385 struct GSF_PendingRequestData *prd;
387 prd = GSF_pending_request_get_data_ (pr);
388 while (NULL != (rp = prd->rp_head))
390 GNUNET_CONTAINER_heap_remove_node (rp->hn);
391 GNUNET_CONTAINER_DLL_remove (prd->rp_head,
400 * Initialize plan subsystem.
405 plans = GNUNET_CONTAINER_multihashmap_create (256);
410 * Shutdown plan subsystem.
416 GNUNET_CONTAINER_multihashmap_size (plans));
417 GNUNET_CONTAINER_multihashmap_destroy (plans);
422 /* end of gnunet-service-fs_pe.h */