2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file testbed/gnunet-service-testbed_cache.c
23 * @brief testbed cache implementation
24 * @author Sree Harsha Totakura
26 #include "gnunet-service-testbed.h"
29 * Redefine LOG with a changed log component string
34 #define LOG(kind,...) \
35 GNUNET_log_from (kind, "testbed-cache", __VA_ARGS__)
39 * Time to expire a cache entry
41 #define CACHE_EXPIRY \
42 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
46 * Type of cache-get requests
51 * Get transport handle
53 CGT_TRANSPORT_HANDLE = 1,
63 * The cache-get request handle
65 struct GSTCacheGetHandle;
69 * This context structure is used to maintain a queue of notifications to check
70 * which of them are to be notified when a peer is connected.
72 struct ConnectNotifyContext
75 * The next ptr for the DLL
77 struct ConnectNotifyContext *next;
80 * The prev ptr for the DLL
82 struct ConnectNotifyContext *prev;
85 * The peer identity of the target peer. When this target peer is connected,
86 * call the notify callback
88 const struct GNUNET_PeerIdentity *target;
91 * The notify callback to be called when the target peer is connected
93 GST_cache_peer_connect_notify cb;
96 * The closure for the notify callback
101 * The GSTCacheGetHandle reposible for creating this context
103 struct GSTCacheGetHandle *cgh;
109 * The cache-get request handle
111 struct GSTCacheGetHandle
114 * The next ptr for the DLL. Used in struct CacheEntry
116 struct GSTCacheGetHandle *next;
119 * The prev ptr for the DLL. Used in struct CacheEntry
121 struct GSTCacheGetHandle *prev;
124 * The cache entry object this handle corresponds to
126 struct CacheEntry *entry;
129 * The cache callback to call when a handle is available
131 GST_cache_handle_ready_cb cb;
134 * The closure for the above callback
139 * The peer connect notify context created for this handle; can be NULL
141 struct ConnectNotifyContext *nctxt;
144 * The type of this cache-get request
146 enum CacheGetType type;
149 * Did we call the cache callback already?
160 * DLL next ptr for least recently used cache entries
162 struct CacheEntry *next;
165 * DLL prev ptr for least recently used cache entries
167 struct CacheEntry *prev;
170 * The transport handle to the peer corresponding to this entry; can be NULL
172 struct GNUNET_TRANSPORT_Handle *transport_handle;
175 * The operation handle for transport handle
177 struct GNUNET_TESTBED_Operation *transport_op;
180 * The core handle to the peer corresponding to this entry; can be NULL
182 struct GNUNET_CORE_Handle *core_handle;
185 * The operation handle for core handle
187 struct GNUNET_TESTBED_Operation *core_op;
190 * The peer identity of this peer. Will be set upon opening a connection to
191 * the peers CORE service. Will be NULL until then and after the CORE
192 * connection is closed
194 struct GNUNET_PeerIdentity *peer_identity;
197 * The configuration of the peer. Should be not NULL as long as the core_handle
198 * or transport_handle are valid
200 struct GNUNET_CONFIGURATION_Handle *cfg;
203 * The key for this entry
205 struct GNUNET_HashCode key;
210 struct GNUNET_MessageHeader *hello;
213 * the head of the CacheGetHandle queue
215 struct GSTCacheGetHandle *cgh_qhead;
218 * the tail of the CacheGetHandle queue
220 struct GSTCacheGetHandle *cgh_qtail;
223 * DLL head for the queue of notifications contexts to check which of them are to
224 * be notified when a peer is connected.
226 struct ConnectNotifyContext *nctxt_qhead;
229 * DLL tail for the queue of notifications contexts to check which of them are to
230 * be notified when a peer is connected.
232 struct ConnectNotifyContext *nctxt_qtail;
235 * The task that calls the cache callback
237 GNUNET_SCHEDULER_TaskIdentifier notify_task;
240 * The task to expire this cache entry, free any handlers it has opened and
241 * mark their corresponding operations as done.
243 GNUNET_SCHEDULER_TaskIdentifier expire_task;
246 * Number of operations this cache entry is being used
251 * The id of the peer this entry corresponds to
253 unsigned int peer_id;
256 * Is this entry in LRU cache queue?
263 * Hashmap to maintain cache
265 static struct GNUNET_CONTAINER_MultiHashMap *cache;
268 * DLL head for least recently used cache entries; least recently used
269 * cache items are at the head. The cache enties are added to this queue when
270 * their demand becomes zero. They are removed from the queue when they are
271 * needed by any operation.
273 static struct CacheEntry *lru_cache_head;
276 * DLL tail for least recently used cache entries; recently used cache
277 * items are at the tail.The cache enties are added to this queue when
278 * their demand becomes zero. They are removed from the queue when they are
279 * needed by any operation.
281 static struct CacheEntry *lru_cache_tail;
284 * the size of the LRU queue
286 static unsigned int lru_cache_size;
289 * the threshold size for the LRU queue
291 static unsigned int lru_cache_threshold_size;
294 * The total number of elements in cache
296 static unsigned int cache_size;
300 * Looks up in the cache and returns the entry
302 * @param key the peer identity of the peer whose corresponding entry has to be
304 * @return the HELLO message; NULL if not found
306 static struct CacheEntry *
307 cache_lookup (const struct GNUNET_HashCode *key)
309 struct CacheEntry *entry;
313 entry = GNUNET_CONTAINER_multihashmap_get (cache, key);
319 * Function to disconnect the core and transport handles; free the existing
320 * configuration; and remove from the LRU cache list. The entry is left to be in
321 * the hash table so that the HELLO can still be found later
323 * @param entry the cache entry
326 close_handles (struct CacheEntry *entry)
328 struct ConnectNotifyContext *ctxt;
330 GNUNET_assert (0 == entry->demand);
331 if (GNUNET_YES == entry->in_lru)
333 GNUNET_assert (0 < lru_cache_size);
334 if (GNUNET_SCHEDULER_NO_TASK != entry->expire_task)
336 GNUNET_SCHEDULER_cancel (entry->expire_task);
337 entry->expire_task = GNUNET_SCHEDULER_NO_TASK;
339 GNUNET_CONTAINER_DLL_remove (lru_cache_head, lru_cache_tail, entry);
341 entry->in_lru = GNUNET_NO;
343 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == entry->expire_task);
344 while (NULL != (ctxt = entry->nctxt_qhead))
346 GNUNET_CONTAINER_DLL_remove (entry->nctxt_qhead, entry->nctxt_qtail, ctxt);
349 LOG_DEBUG ("Cleaning up handles from an entry in cache\n");
350 if (NULL != entry->transport_handle)
351 GNUNET_assert (NULL != entry->transport_op);
352 if (NULL != entry->transport_op)
354 GNUNET_TESTBED_operation_done (entry->transport_op);
355 entry->transport_op = NULL;
357 if (NULL != entry->core_op)
359 GNUNET_TESTBED_operation_done (entry->core_op);
360 entry->core_op = NULL;
362 GNUNET_assert (NULL == entry->core_handle);
363 if (NULL != entry->cfg)
365 GNUNET_CONFIGURATION_destroy (entry->cfg);
372 * The task to expire this cache entry, free any handlers it has opened and
373 * mark their corresponding operations as done.
375 * @param cls the CacheEntry
376 * @param tc the scheduler task context
379 expire_cache_entry (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
381 struct CacheEntry *entry = cls;
383 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != entry->expire_task);
384 entry->expire_task = GNUNET_SCHEDULER_NO_TASK;
385 close_handles (entry);
390 * Creates a new cache entry and then puts it into the cache's hashtable.
392 * @param key the hash code to use for inserting the newly created entry
393 * @param peer_id the index of the peer to tag the newly created entry
394 * @return the newly created entry
396 static struct CacheEntry *
397 add_entry (const struct GNUNET_HashCode *key, unsigned int peer_id)
399 struct CacheEntry *entry;
401 entry = GNUNET_malloc (sizeof (struct CacheEntry));
402 entry->peer_id = peer_id;
403 memcpy (&entry->key, key, sizeof (struct GNUNET_HashCode));
404 GNUNET_assert (GNUNET_OK ==
405 GNUNET_CONTAINER_multihashmap_put (cache, &entry->key, entry,
406 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
413 * Function to find a suitable GSTCacheGetHandle which is waiting for one of the
414 * handles in given entry to be available.
416 * @param entry the cache entry whose GSTCacheGetHandle list has to be searched
417 * @param head the starting list element in the GSTCacheGetHandle where the
418 * search has to be begin
419 * @return a suitable GSTCacheGetHandle whose handle ready notify callback
420 * hasn't been called yet. NULL if no such suitable GSTCacheGetHandle
423 static struct GSTCacheGetHandle *
424 search_suitable_cgh (const struct CacheEntry *entry,
425 const struct GSTCacheGetHandle *head)
427 const struct GSTCacheGetHandle *cgh;
429 for (cgh = head; NULL != cgh; cgh = cgh->next)
431 if (GNUNET_YES == cgh->notify_called)
435 case CGT_TRANSPORT_HANDLE:
436 if (NULL == entry->transport_handle)
439 case CGT_CORE_HANDLE:
440 if (NULL == entry->core_handle)
442 if (NULL == entry->peer_identity) /* Our CORE connection isn't ready yet */
448 return (struct GSTCacheGetHandle *) cgh;
453 * Task to call the handle ready notify callback of a queued GSTCacheGetHandle
454 * of an entry when one or all of its handles are available.
456 * @param cls the cache entry
457 * @param tc the task context from scheduler
460 call_cgh_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
462 struct CacheEntry *entry = cls;
463 struct GSTCacheGetHandle *cgh;
464 const struct GSTCacheGetHandle *cgh2;
466 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != entry->notify_task);
467 entry->notify_task = GNUNET_SCHEDULER_NO_TASK;
468 cgh = search_suitable_cgh (entry, entry->cgh_qhead);
469 GNUNET_assert (NULL != cgh);
471 if (NULL != cgh->next)
472 cgh2 = search_suitable_cgh (entry, cgh->next);
473 GNUNET_CONTAINER_DLL_remove (entry->cgh_qhead, entry->cgh_qtail, cgh);
474 cgh->notify_called = GNUNET_YES;
475 GNUNET_CONTAINER_DLL_insert_tail (entry->cgh_qhead, entry->cgh_qtail, cgh);
477 entry->notify_task = GNUNET_SCHEDULER_add_now (&call_cgh_cb, entry);
478 if (NULL != cgh->nctxt)
479 { /* Register the peer connect notify callback */
480 GNUNET_CONTAINER_DLL_insert_tail (entry->nctxt_qhead, entry->nctxt_qtail,
483 LOG_DEBUG ("Calling notify for handle type %u\n", cgh->type);
484 cgh->cb (cgh->cb_cls, entry->core_handle, entry->transport_handle,
485 entry->peer_identity);
490 * Function called from peer connect notify callbacks from CORE and TRANSPORT
491 * connections. This function calls the pendning peer connect notify callbacks
492 * which are queued in an entry.
494 * @param cls the cache entry
495 * @param peer the peer that connected
496 * @param type the type of the handle this notification corresponds to
499 peer_connect_notify_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
500 const enum CacheGetType type)
502 struct CacheEntry *entry = cls;
503 struct ConnectNotifyContext *ctxt;
504 struct ConnectNotifyContext *ctxt2;
505 GST_cache_peer_connect_notify cb;
509 for (ctxt = entry->nctxt_qhead; NULL != ctxt;)
511 GNUNET_assert (NULL != ctxt->cgh);
512 if (type != ctxt->cgh->type)
517 if (0 != memcmp (ctxt->target, peer, sizeof (struct GNUNET_PeerIdentity)))
523 cb_cls = ctxt->cb_cls;
524 ctxt->cgh->nctxt = NULL;
526 GNUNET_CONTAINER_DLL_remove (entry->nctxt_qhead, entry->nctxt_qtail, ctxt);
538 * Function called to notify transport users that another
539 * peer connected to us.
542 * @param peer the peer that connected
543 * @param ats performance data
544 * @param ats_count number of entries in ats (excluding 0-termination)
547 transport_peer_connect_notify_cb (void *cls,
548 const struct GNUNET_PeerIdentity *peer)
550 peer_connect_notify_cb (cls, peer, CGT_TRANSPORT_HANDLE);
555 * Function called when resources for opening a connection to TRANSPORT are
558 * @param cls the cache entry
561 opstart_get_handle_transport (void *cls)
563 struct CacheEntry *entry = cls;
565 GNUNET_assert (NULL != entry);
566 LOG_DEBUG ("Opening a transport connection to peer %u\n", entry->peer_id);
567 entry->transport_handle =
568 GNUNET_TRANSPORT_connect (entry->cfg, NULL, entry, NULL,
569 &transport_peer_connect_notify_cb, NULL);
570 if (NULL == entry->transport_handle)
575 if (0 == entry->demand)
577 if (GNUNET_SCHEDULER_NO_TASK != entry->notify_task)
579 if (NULL != search_suitable_cgh (entry, entry->cgh_qhead))
580 entry->notify_task = GNUNET_SCHEDULER_add_now (&call_cgh_cb, entry);
585 * Function called when the operation responsible for opening a TRANSPORT
586 * connection is marked as done.
588 * @param cls the cache entry
591 oprelease_get_handle_transport (void *cls)
593 struct CacheEntry *entry = cls;
595 if (NULL == entry->transport_handle)
597 GNUNET_TRANSPORT_disconnect (entry->transport_handle);
598 entry->transport_handle = NULL;
603 * Function called after GNUNET_CORE_connect has succeeded (or failed
604 * for good). Note that the private key of the peer is intentionally
605 * not exposed here; if you need it, your process should try to read
606 * the private key file directly (which should work if you are
607 * authorized...). Implementations of this function must not call
608 * GNUNET_CORE_disconnect (other than by scheduling a new task to
612 * @param server handle to the server, NULL if we failed
613 * @param my_identity ID of this peer, NULL if we failed
616 core_startup_cb (void *cls, struct GNUNET_CORE_Handle *server,
617 const struct GNUNET_PeerIdentity *my_identity)
619 struct CacheEntry *entry = cls;
621 if (NULL == my_identity)
626 GNUNET_assert (NULL == entry->peer_identity);
627 GNUNET_break (NULL != server);
628 entry->core_handle = server;
629 entry->peer_identity = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
630 memcpy (entry->peer_identity, my_identity,
631 sizeof (struct GNUNET_PeerIdentity));
632 if (0 == entry->demand)
634 if (GNUNET_SCHEDULER_NO_TASK != entry->notify_task)
636 if (NULL != search_suitable_cgh (entry, entry->cgh_qhead))
637 entry->notify_task = GNUNET_SCHEDULER_add_now (&call_cgh_cb, entry);
642 * Method called whenever a given peer connects at CORE level
645 * @param peer peer identity this notification is about
646 * @param atsi performance data for the connection
647 * @param atsi_count number of records in 'atsi'
650 core_peer_connect_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
651 const struct GNUNET_ATS_Information *atsi,
652 unsigned int atsi_count)
654 peer_connect_notify_cb (cls, peer, CGT_CORE_HANDLE);
659 * Function called when resources for opening a connection to CORE are
662 * @param cls the cache entry
665 opstart_get_handle_core (void *cls)
667 struct CacheEntry *entry = cls;
669 const struct GNUNET_CORE_MessageHandler no_handlers[] = {
673 GNUNET_assert (NULL != entry);
674 LOG_DEBUG ("Opening a CORE connection to peer %u\n", entry->peer_id);
676 GNUNET_CORE_connect (entry->cfg, entry, /* closure */
677 &core_startup_cb, /* core startup notify */
678 &core_peer_connect_cb, /* peer connect notify */
679 NULL, /* peer disconnect notify */
680 NULL, /* inbound notify */
681 GNUNET_NO, /* inbound header only? */
682 NULL, /* outbound notify */
683 GNUNET_NO, /* outbound header only? */
689 * Function called when the operation responsible for opening a TRANSPORT
690 * connection is marked as done.
692 * @param cls the cache entry
695 oprelease_get_handle_core (void *cls)
697 struct CacheEntry *entry = cls;
699 if (NULL == entry->core_handle)
701 GNUNET_CORE_disconnect (entry->core_handle);
702 entry->core_handle = NULL;
703 GNUNET_free_non_null (entry->peer_identity);
704 entry->peer_identity = NULL;
709 * Function to get a handle with given configuration. The type of the handle is
710 * implicitly provided in the GSTCacheGetHandle. If the handle is already cached
711 * before, it will be retured in the given callback; the peer_id is used to
712 * lookup in the cache; if not, a new operation is started to open the transport
713 * handle and will be given in the callback when it is available.
715 * @param peer_id the index of the peer
716 * @param cgh the CacheGetHandle
717 * @param cfg the configuration with which the transport handle has to be
718 * created if it was not present in the cache
719 * @param target the peer identify of the peer whose connection to
720 * TRANSPORT/CORE (depending on the type of 'cgh') subsystem will be
721 * notified through the connect_notify_cb. Can be NULL
722 * @param connect_notify_cb the callback to call when the given target peer is
723 * connected. This callback will only be called once or never again (in
724 * case the target peer cannot be connected). Can be NULL
725 * @param connect_notify_cb_cls the closure for the above callback
726 * @return the handle which can be used to cancel or mark that the handle is no
729 static struct GSTCacheGetHandle *
730 cache_get_handle (unsigned int peer_id, struct GSTCacheGetHandle *cgh,
731 const struct GNUNET_CONFIGURATION_Handle *cfg,
732 const struct GNUNET_PeerIdentity *target,
733 GST_cache_peer_connect_notify connect_notify_cb,
734 void *connect_notify_cb_cls)
736 struct GNUNET_HashCode key;
738 struct CacheEntry *entry;
739 struct ConnectNotifyContext *ctxt;
740 struct GNUNET_TESTBED_Operation *op;
742 GNUNET_assert (0 != cgh->type);
743 GNUNET_CRYPTO_hash (&peer_id, sizeof (peer_id), &key);
745 entry = cache_lookup (&key);
748 if (GNUNET_YES == entry->in_lru)
750 GNUNET_assert (0 == entry->demand);
751 GNUNET_assert (0 < lru_cache_size);
752 if (GNUNET_SCHEDULER_NO_TASK != entry->expire_task)
754 GNUNET_SCHEDULER_cancel (entry->expire_task);
755 entry->expire_task = GNUNET_SCHEDULER_NO_TASK;
757 GNUNET_CONTAINER_DLL_remove (lru_cache_head, lru_cache_tail, entry);
759 entry->in_lru = GNUNET_NO;
763 case CGT_TRANSPORT_HANDLE:
764 handle = entry->transport_handle;
766 LOG_DEBUG ("Found TRANSPORT handle in cache for peer %u\n",
769 case CGT_CORE_HANDLE:
770 handle = entry->core_handle;
772 LOG_DEBUG ("Found CORE handle in cache for peer %u\n", entry->peer_id);
777 entry = add_entry (&key, peer_id);
778 if (NULL == entry->cfg)
779 entry->cfg = GNUNET_CONFIGURATION_dup (cfg);
782 GNUNET_CONTAINER_DLL_insert (entry->cgh_qhead, entry->cgh_qtail, cgh);
783 if ((NULL != target) && (NULL != connect_notify_cb))
785 ctxt = GNUNET_malloc (sizeof (struct ConnectNotifyContext));
786 ctxt->target = target;
787 ctxt->cb = connect_notify_cb;
788 ctxt->cb_cls = connect_notify_cb_cls;
789 GNUNET_assert (NULL == cgh->nctxt);
795 if (GNUNET_SCHEDULER_NO_TASK == entry->notify_task)
797 if (NULL != search_suitable_cgh (entry, entry->cgh_qhead))
798 entry->notify_task = GNUNET_SCHEDULER_add_now (&call_cgh_cb, entry);
804 case CGT_TRANSPORT_HANDLE:
805 if (NULL != entry->transport_op)
807 op = GNUNET_TESTBED_operation_create_ (entry, &opstart_get_handle_transport,
808 &oprelease_get_handle_transport);
809 entry->transport_op = op;
811 case CGT_CORE_HANDLE:
812 if (NULL != entry->core_op)
814 op = GNUNET_TESTBED_operation_create_ (entry, &opstart_get_handle_core,
815 &oprelease_get_handle_core);
819 GNUNET_TESTBED_operation_queue_insert_ (GST_opq_openfds, op);
820 GNUNET_TESTBED_operation_begin_wait_ (op);
826 * Iterator over hash map entries.
829 * @param key current key code
830 * @param value value in the hash map
831 * @return GNUNET_YES if we should continue to
836 cache_clear_iterator (void *cls, const struct GNUNET_HashCode *key, void *value)
838 struct CacheEntry *entry = value;
839 static unsigned int ncleared;
841 GNUNET_assert (NULL != entry);
842 GNUNET_break (0 == entry->demand);
843 LOG_DEBUG ("Clearing entry %u of %u\n", ++ncleared, cache_size);
844 GNUNET_CONTAINER_multihashmap_remove (cache, key, value);
845 close_handles (entry);
846 GNUNET_free_non_null (entry->hello);
847 GNUNET_break (GNUNET_SCHEDULER_NO_TASK == entry->expire_task);
848 GNUNET_assert (NULL == entry->transport_handle);
849 GNUNET_assert (NULL == entry->transport_op);
850 GNUNET_assert (NULL == entry->core_handle);
851 GNUNET_assert (NULL == entry->core_op);
852 GNUNET_assert (NULL == entry->cfg);
853 GNUNET_assert (NULL == entry->cgh_qhead);
854 GNUNET_assert (NULL == entry->cgh_qtail);
855 GNUNET_assert (NULL == entry->nctxt_qhead);
856 GNUNET_assert (NULL == entry->nctxt_qtail);
868 GNUNET_CONTAINER_multihashmap_iterate (cache, &cache_clear_iterator, NULL);
869 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (cache));
870 GNUNET_CONTAINER_multihashmap_destroy (cache);
873 lru_cache_threshold_size = 0;
875 lru_cache_head = NULL;
876 lru_cache_tail = NULL;
881 * Initializes the cache
883 * @param size the size of the cache
886 GST_cache_init (unsigned int size)
890 lru_cache_threshold_size = size;
893 cache = GNUNET_CONTAINER_multihashmap_create (size, GNUNET_YES);
898 * Mark the GetCacheHandle as being done if a handle has been provided already
899 * or as being cancelled if the callback for the handle hasn't been called.
901 * @param cgh the CacheGetHandle handle
904 GST_cache_get_handle_done (struct GSTCacheGetHandle *cgh)
906 struct CacheEntry *entry;
909 GNUNET_assert (NULL != entry);
910 GNUNET_assert (0 < entry->demand);
912 if (GNUNET_SCHEDULER_NO_TASK != entry->notify_task)
914 GNUNET_SCHEDULER_cancel (entry->notify_task);
915 entry->notify_task = GNUNET_SCHEDULER_NO_TASK;
917 GNUNET_CONTAINER_DLL_remove (entry->cgh_qhead, entry->cgh_qtail, cgh);
918 if (NULL != cgh->nctxt)
920 GNUNET_assert (cgh == cgh->nctxt->cgh);
921 if (GNUNET_YES == cgh->notify_called)
922 GNUNET_CONTAINER_DLL_remove (entry->nctxt_qhead, entry->nctxt_qtail,
924 GNUNET_free (cgh->nctxt);
927 if (0 == entry->demand)
930 GNUNET_SCHEDULER_add_delayed (CACHE_EXPIRY, &expire_cache_entry, entry);
931 GNUNET_CONTAINER_DLL_insert_tail (lru_cache_head, lru_cache_tail, entry);
933 entry->in_lru = GNUNET_YES;
934 if (lru_cache_size > lru_cache_threshold_size)
935 close_handles (lru_cache_head);
939 struct GSTCacheGetHandle *cgh2;
941 if (NULL != (cgh2 = search_suitable_cgh (entry, entry->cgh_qhead)))
942 entry->notify_task = GNUNET_SCHEDULER_add_now (&call_cgh_cb, entry);
948 * Get a transport handle with the given configuration. If the handle is
949 * already cached before, it will be retured in the given callback; the peer_id
950 * is used to lookup in the cache; if not, a new operation is started to open the
951 * transport handle and will be given in the callback when it is available.
953 * @param peer_id the index of the peer
954 * @param cfg the configuration with which the transport handle has to be
955 * created if it was not present in the cache
956 * @param cb the callback to notify when the transport handle is available
957 * @param cb_cls the closure for the above callback
958 * @param target the peer identify of the peer whose connection to our TRANSPORT
959 * subsystem will be notified through the connect_notify_cb. Can be NULL
960 * @param connect_notify_cb the callback to call when the given target peer is
961 * connected. This callback will only be called once or never again (in
962 * case the target peer cannot be connected). Can be NULL
963 * @param connect_notify_cb_cls the closure for the above callback
964 * @return the handle which can be used to cancel or mark that the handle is no
967 struct GSTCacheGetHandle *
968 GST_cache_get_handle_transport (unsigned int peer_id,
969 const struct GNUNET_CONFIGURATION_Handle *cfg,
970 GST_cache_handle_ready_cb cb, void *cb_cls,
971 const struct GNUNET_PeerIdentity *target,
972 GST_cache_peer_connect_notify connect_notify_cb,
973 void *connect_notify_cb_cls)
975 struct GSTCacheGetHandle *cgh;
977 cgh = GNUNET_malloc (sizeof (struct GSTCacheGetHandle));
979 cgh->cb_cls = cb_cls;
980 cgh->type = CGT_TRANSPORT_HANDLE;
981 return cache_get_handle (peer_id, cgh, cfg, target, connect_notify_cb,
982 connect_notify_cb_cls);
987 * Get a CORE handle with the given configuration. If the handle is already
988 * cached before, it will be retured in the given callback; the peer_id is used
989 * to lookup in the cache. If the handle is not cached before, a new operation
990 * is started to open the CORE handle and will be given in the callback when it
991 * is available along with the peer identity
993 * @param peer_id the index of the peer
994 * @param cfg the configuration with which the transport handle has to be
995 * created if it was not present in the cache
996 * @param cb the callback to notify when the transport handle is available
997 * @param cb_cls the closure for the above callback
998 * @param target the peer identify of the peer whose connection to our CORE
999 * subsystem will be notified through the connect_notify_cb. Can be NULL
1000 * @param connect_notify_cb the callback to call when the given target peer is
1001 * connected. This callback will only be called once or never again (in
1002 * case the target peer cannot be connected). Can be NULL
1003 * @param connect_notify_cb_cls the closure for the above callback
1004 * @return the handle which can be used to cancel or mark that the handle is no
1007 struct GSTCacheGetHandle *
1008 GST_cache_get_handle_core (unsigned int peer_id,
1009 const struct GNUNET_CONFIGURATION_Handle *cfg,
1010 GST_cache_handle_ready_cb cb, void *cb_cls,
1011 const struct GNUNET_PeerIdentity *target,
1012 GST_cache_peer_connect_notify connect_notify_cb,
1013 void *connect_notify_cb_cls)
1015 struct GSTCacheGetHandle *cgh;
1017 cgh = GNUNET_malloc (sizeof (struct GSTCacheGetHandle));
1019 cgh->cb_cls = cb_cls;
1020 cgh->type = CGT_CORE_HANDLE;
1021 return cache_get_handle (peer_id, cgh, cfg, target, connect_notify_cb,
1022 connect_notify_cb_cls);
1027 * Looks up in the hello cache and returns the HELLO of the given peer
1029 * @param peer_id the index of the peer whose HELLO has to be looked up
1030 * @return the HELLO message; NULL if not found
1032 const struct GNUNET_MessageHeader *
1033 GST_cache_lookup_hello (const unsigned int peer_id)
1035 struct CacheEntry *entry;
1036 struct GNUNET_HashCode key;
1038 LOG_DEBUG ("Looking up HELLO for peer %u\n", peer_id);
1039 GNUNET_CRYPTO_hash (&peer_id, sizeof (peer_id), &key);
1040 entry = cache_lookup (&key);
1043 if (NULL != entry->hello)
1044 LOG_DEBUG ("HELLO found for peer %u\n", peer_id);
1045 return entry->hello;
1050 * Caches the HELLO of the given peer. Updates the HELLO if it was already
1053 * @param peer_id the peer identity of the peer whose HELLO has to be cached
1054 * @param hello the HELLO message
1057 GST_cache_add_hello (const unsigned int peer_id,
1058 const struct GNUNET_MessageHeader *hello)
1060 struct CacheEntry *entry;
1061 struct GNUNET_HashCode key;
1063 GNUNET_CRYPTO_hash (&peer_id, sizeof (peer_id), &key);
1064 entry = GNUNET_CONTAINER_multihashmap_get (cache, &key);
1066 entry = add_entry (&key, peer_id);
1067 GNUNET_free_non_null (entry->hello);
1068 entry->hello = GNUNET_copy_message (hello);
1071 /* end of gnunet-service-testbed_hc.c */