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- /*
- This file is part of GNUnet.
- (C) 2011 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
- /**
- * @file fs/gnunet-service-fs_pe.c
- * @brief API to manage query plan
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet-service-fs.h"
- #include "gnunet-service-fs_cp.h"
- #include "gnunet-service-fs_pe.h"
- #include "gnunet-service-fs_pr.h"
- /**
- * Collect an instane number of statistics? May cause excessive IPC.
- */
- #define INSANE_STATISTICS GNUNET_NO
- /**
- * List of GSF_PendingRequests this request plan
- * participates with.
- */
- struct PendingRequestList;
- /**
- * Transmission plan for a peer.
- */
- struct PeerPlan;
- /**
- * M:N binding of plans to pending requests.
- * Each pending request can be in a number of plans,
- * and each plan can have a number of pending requests.
- * Objects of this type indicate a mapping of a plan to
- * a particular pending request.
- *
- * The corresponding head and tail of the "PE" MDLL
- * are stored in a `struct GSF_RequestPlan`. (We need
- * to be able to lookup all pending requests corresponding
- * to a given plan entry.)
- *
- * Similarly head and tail of the "PR" MDLL are stored
- * with the 'struct GSF_PendingRequest'. (We need
- * to be able to lookup all plan entries corresponding
- * to a given pending request.)
- */
- struct GSF_PendingRequestPlanBijection
- {
- /**
- * This is a doubly-linked list.
- */
- struct GSF_PendingRequestPlanBijection *next_PR;
- /**
- * This is a doubly-linked list.
- */
- struct GSF_PendingRequestPlanBijection *prev_PR;
- /**
- * This is a doubly-linked list.
- */
- struct GSF_PendingRequestPlanBijection *next_PE;
- /**
- * This is a doubly-linked list.
- */
- struct GSF_PendingRequestPlanBijection *prev_PE;
- /**
- * Associated request plan.
- */
- struct GSF_RequestPlan *rp;
- /**
- * Associated pending request.
- */
- struct GSF_PendingRequest *pr;
- };
- /**
- * Information we keep per request per peer. This is a doubly-linked
- * list (with head and tail in the 'struct GSF_PendingRequestData')
- * with one entry in each heap of each 'struct PeerPlan'. Each
- * entry tracks information relevant for this request and this peer.
- */
- struct GSF_RequestPlan
- {
- /**
- * This is a doubly-linked list.
- */
- struct GSF_RequestPlan *next;
- /**
- * This is a doubly-linked list.
- */
- struct GSF_RequestPlan *prev;
- /**
- * Heap node associated with this request and this peer.
- */
- struct GNUNET_CONTAINER_HeapNode *hn;
- /**
- * The transmission plan for a peer that this request is associated with.
- */
- struct PeerPlan *pp;
- /**
- * Head of list of associated pending requests.
- */
- struct GSF_PendingRequestPlanBijection *pe_head;
- /**
- * Tail of list of associated pending requests.
- */
- struct GSF_PendingRequestPlanBijection *pe_tail;
- /**
- * Earliest time we'd be happy to (re)transmit this request.
- */
- struct GNUNET_TIME_Absolute earliest_transmission;
- /**
- * When was the last time we transmitted this request to this peer? 0 for never.
- */
- struct GNUNET_TIME_Absolute last_transmission;
- /**
- * Current priority for this request for this target.
- */
- uint64_t priority;
- /**
- * How often did we transmit this request to this peer?
- */
- unsigned int transmission_counter;
- };
- /**
- * Transmission plan for a peer.
- */
- struct PeerPlan
- {
- /**
- * Heap with pending queries (struct GSF_RequestPlan), higher weights mean higher priority.
- */
- struct GNUNET_CONTAINER_Heap *priority_heap;
- /**
- * Heap with pending queries (struct GSF_RequestPlan), by transmission time, lowest first.
- */
- struct GNUNET_CONTAINER_Heap *delay_heap;
- /**
- * Map of queries to plan entries. All entries in the priority_heap or delay_heap
- * should be in the plan map. Note that it IS possible for the plan map to have
- * multiple entries for the same query.
- */
- struct GNUNET_CONTAINER_MultiHashMap *plan_map;
- /**
- * Current transmission request handle.
- */
- struct GSF_PeerTransmitHandle *pth;
- /**
- * Peer for which this is the plan.
- */
- struct GSF_ConnectedPeer *cp;
- /**
- * Current task for executing the plan.
- */
- GNUNET_SCHEDULER_TaskIdentifier task;
- };
- /**
- * Hash map from peer identities to PeerPlans.
- */
- static struct GNUNET_CONTAINER_MultiPeerMap *plans;
- /**
- * Sum of all transmission counters (equals total delay for all plan entries).
- */
- static unsigned long long total_delay;
- /**
- * Number of plan entries.
- */
- static unsigned long long plan_count;
- /**
- * Return the query (key in the plan_map) for the given request plan.
- * Note that this key may change as there can be multiple pending
- * requests for the same key and we just return _one_ of them; this
- * particular one might complete while another one might still be
- * active, hence the lifetime of the returned hash code is NOT
- * necessarily identical to that of the 'struct GSF_RequestPlan'
- * given.
- *
- * @param rp a request plan
- * @return the associated query
- */
- static const struct GNUNET_HashCode *
- get_rp_key (struct GSF_RequestPlan *rp)
- {
- return &GSF_pending_request_get_data_ (rp->pe_head->pr)->query;
- }
- /**
- * Figure out when and how to transmit to the given peer.
- *
- * @param cls the `struct GSF_ConnectedPeer` for transmission
- * @param tc scheduler context
- */
- static void
- schedule_peer_transmission (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
- /**
- * Insert the given request plan into the heap with the appropriate weight.
- *
- * @param pp associated peer's plan
- * @param rp request to plan
- */
- static void
- plan (struct PeerPlan *pp, struct GSF_RequestPlan *rp)
- {
- #define N ((double)128.0)
- /**
- * Running average delay we currently impose.
- */
- static double avg_delay;
- struct GSF_PendingRequestData *prd;
- struct GNUNET_TIME_Relative delay;
- GNUNET_assert (rp->pp == pp);
- GNUNET_STATISTICS_set (GSF_stats,
- gettext_noop ("# average retransmission delay (ms)"),
- total_delay * 1000LL / plan_count, GNUNET_NO);
- prd = GSF_pending_request_get_data_ (rp->pe_head->pr);
- if (rp->transmission_counter < 8)
- delay =
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- rp->transmission_counter);
- else if (rp->transmission_counter < 32)
- delay =
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- 8 +
- (1LL << (rp->transmission_counter - 8)));
- else
- delay =
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- 8 + (1LL << 24));
- delay.rel_value_us =
- GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- delay.rel_value_us + 1);
- /* Add 0.01 to avg_delay to avoid division-by-zero later */
- avg_delay = (((avg_delay * (N - 1.0)) + delay.rel_value_us) / N) + 0.01;
- /*
- * For the priority, we need to consider a few basic rules:
- * 1) if we just started requesting (delay is small), we should
- * virtually always have a priority of zero.
- * 2) for requests with average latency, our priority should match
- * the average priority observed on the network
- * 3) even the longest-running requests should not be WAY out of
- * the observed average (thus we bound by a factor of 2)
- * 4) we add +1 to the observed average priority to avoid everyone
- * staying put at zero (2 * 0 = 0...).
- *
- * Using the specific calculation below, we get:
- *
- * delay = 0 => priority = 0;
- * delay = avg delay => priority = running-average-observed-priority;
- * delay >> avg_delay => priority = 2 * running-average-observed-priority;
- *
- * which satisfies all of the rules above.
- *
- * Note: M_PI_4 = PI/4 = arctan(1)
- */
- rp->priority =
- round ((GSF_current_priorities +
- 1.0) * atan (delay.rel_value_us / avg_delay)) / M_PI_4;
- /* Note: usage of 'round' and 'atan' requires -lm */
- if (rp->transmission_counter != 0)
- delay.rel_value_us += TTL_DECREMENT * 1000;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Considering (re)transmission number %u in %s\n",
- (unsigned int) rp->transmission_counter,
- GNUNET_STRINGS_relative_time_to_string (delay,
- GNUNET_YES));
- rp->earliest_transmission = GNUNET_TIME_relative_to_absolute (delay);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Earliest (re)transmission for `%s' in %us\n",
- GNUNET_h2s (&prd->query), rp->transmission_counter);
- GNUNET_assert (rp->hn == NULL);
- if (0 == GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission).rel_value_us)
- rp->hn = GNUNET_CONTAINER_heap_insert (pp->priority_heap, rp, rp->priority);
- else
- rp->hn =
- GNUNET_CONTAINER_heap_insert (pp->delay_heap, rp,
- rp->earliest_transmission.abs_value_us);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_contains_value (pp->plan_map,
- get_rp_key (rp),
- rp));
- if (GNUNET_SCHEDULER_NO_TASK != pp->task)
- GNUNET_SCHEDULER_cancel (pp->task);
- pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
- #undef N
- }
- /**
- * Get the pending request with the highest TTL from the given plan.
- *
- * @param rp plan to investigate
- * @return pending request with highest TTL
- */
- struct GSF_PendingRequest *
- get_latest (const struct GSF_RequestPlan *rp)
- {
- struct GSF_PendingRequest *ret;
- struct GSF_PendingRequestPlanBijection *bi;
- bi = rp->pe_head;
- if (NULL == bi)
- return NULL; /* should never happen */
- ret = bi->pr;
- bi = bi->next_PE;
- while (NULL != bi)
- {
- if (GSF_pending_request_get_data_ (bi->pr)->ttl.abs_value_us >
- GSF_pending_request_get_data_ (ret)->ttl.abs_value_us)
- ret = bi->pr;
- bi = bi->next_PE;
- }
- return ret;
- }
- /**
- * Function called to get a message for transmission.
- *
- * @param cls closure
- * @param buf_size number of bytes available in @a buf
- * @param buf where to copy the message, NULL on error (peer disconnect)
- * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
- */
- static size_t
- transmit_message_callback (void *cls, size_t buf_size, void *buf)
- {
- struct PeerPlan *pp = cls;
- struct GSF_RequestPlan *rp;
- size_t msize;
- pp->pth = NULL;
- if (NULL == buf)
- {
- /* failed, try again... */
- if (GNUNET_SCHEDULER_NO_TASK != pp->task)
- GNUNET_SCHEDULER_cancel (pp->task);
- pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# transmission failed (core has no bandwidth)"),
- 1, GNUNET_NO);
- return 0;
- }
- rp = GNUNET_CONTAINER_heap_peek (pp->priority_heap);
- if (NULL == rp)
- {
- if (GNUNET_SCHEDULER_NO_TASK != pp->task)
- GNUNET_SCHEDULER_cancel (pp->task);
- pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
- return 0;
- }
- msize = GSF_pending_request_get_message_ (get_latest (rp), buf_size, buf);
- if (msize > buf_size)
- {
- if (GNUNET_SCHEDULER_NO_TASK != pp->task)
- GNUNET_SCHEDULER_cancel (pp->task);
- /* buffer to small (message changed), try again */
- pp->task = GNUNET_SCHEDULER_add_now (&schedule_peer_transmission, pp);
- return 0;
- }
- /* remove from root, add again elsewhere... */
- GNUNET_assert (rp == GNUNET_CONTAINER_heap_remove_root (pp->priority_heap));
- rp->hn = NULL;
- rp->last_transmission = GNUNET_TIME_absolute_get ();
- rp->transmission_counter++;
- total_delay++;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Executing plan %p executed %u times, planning retransmission\n",
- rp, rp->transmission_counter);
- plan (pp, rp);
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# query messages sent to other peers"), 1,
- GNUNET_NO);
- return msize;
- }
- /**
- * Figure out when and how to transmit to the given peer.
- *
- * @param cls the `struct PeerPlan`
- * @param tc scheduler context
- */
- static void
- schedule_peer_transmission (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct PeerPlan *pp = cls;
- struct GSF_RequestPlan *rp;
- size_t msize;
- struct GNUNET_TIME_Relative delay;
- pp->task = GNUNET_SCHEDULER_NO_TASK;
- if (NULL != pp->pth)
- {
- GSF_peer_transmit_cancel_ (pp->pth);
- pp->pth = NULL;
- }
- /* move ready requests to priority queue */
- while ((NULL != (rp = GNUNET_CONTAINER_heap_peek (pp->delay_heap))) &&
- (0 == GNUNET_TIME_absolute_get_remaining
- (rp->earliest_transmission).rel_value_us))
- {
- GNUNET_assert (rp == GNUNET_CONTAINER_heap_remove_root (pp->delay_heap));
- rp->hn = GNUNET_CONTAINER_heap_insert (pp->priority_heap, rp, rp->priority);
- }
- if (0 == GNUNET_CONTAINER_heap_get_size (pp->priority_heap))
- {
- /* priority heap (still) empty, check for delay... */
- rp = GNUNET_CONTAINER_heap_peek (pp->delay_heap);
- if (NULL == rp)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No active requests for plan %p.\n",
- pp);
- return; /* both queues empty */
- }
- delay = GNUNET_TIME_absolute_get_remaining (rp->earliest_transmission);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sleeping for %s before retrying requests on plan %p.\n",
- GNUNET_STRINGS_relative_time_to_string (delay,
- GNUNET_YES),
- pp);
- GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# delay heap timeout (ms)"),
- delay.rel_value_us / 1000LL, GNUNET_NO);
- pp->task =
- GNUNET_SCHEDULER_add_delayed (delay, &schedule_peer_transmission, pp);
- return;
- }
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# query plans executed"),
- 1, GNUNET_NO);
- #endif
- /* process from priority heap */
- rp = GNUNET_CONTAINER_heap_peek (pp->priority_heap);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Executing query plan %p\n", rp);
- GNUNET_assert (NULL != rp);
- msize = GSF_pending_request_get_message_ (get_latest (rp), 0, NULL);
- pp->pth =
- GSF_peer_transmit_ (pp->cp, GNUNET_YES, rp->priority,
- GNUNET_TIME_UNIT_FOREVER_REL, msize,
- &transmit_message_callback, pp);
- GNUNET_assert (NULL != pp->pth);
- }
- /**
- * Closure for merge_pr().
- */
- struct MergeContext
- {
- struct GSF_PendingRequest *pr;
- int merged;
- };
- /**
- * Iterator that checks if an equivalent request is already
- * present for this peer.
- *
- * @param cls closure
- * @param query the query
- * @param element request plan stored at the node
- * @return #GNUNET_YES if we should continue to iterate,
- * #GNUNET_NO if not (merge success)
- */
- static int
- merge_pr (void *cls, const struct GNUNET_HashCode * query, void *element)
- {
- struct MergeContext *mpr = cls;
- struct GSF_RequestPlan *rp = element;
- struct GSF_PendingRequestData *prd;
- struct GSF_PendingRequestPlanBijection *bi;
- struct GSF_PendingRequest *latest;
- if (GNUNET_OK !=
- GSF_pending_request_is_compatible_ (mpr->pr, rp->pe_head->pr))
- return GNUNET_YES;
- /* merge new request with existing request plan */
- bi = GNUNET_new (struct GSF_PendingRequestPlanBijection);
- bi->rp = rp;
- bi->pr = mpr->pr;
- prd = GSF_pending_request_get_data_ (mpr->pr);
- GNUNET_CONTAINER_MDLL_insert (PR, prd->pr_head, prd->pr_tail, bi);
- GNUNET_CONTAINER_MDLL_insert (PE, rp->pe_head, rp->pe_tail, bi);
- mpr->merged = GNUNET_YES;
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# requests merged"), 1,
- GNUNET_NO);
- #endif
- latest = get_latest (rp);
- if (GSF_pending_request_get_data_ (latest)->ttl.abs_value_us <
- prd->ttl.abs_value_us)
- {
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# requests refreshed"),
- 1, GNUNET_NO);
- #endif
- rp->transmission_counter = 0; /* reset */
- }
- return GNUNET_NO;
- }
- /**
- * Create a new query plan entry.
- *
- * @param cp peer with the entry
- * @param pr request with the entry
- */
- void
- GSF_plan_add_ (struct GSF_ConnectedPeer *cp,
- struct GSF_PendingRequest *pr)
- {
- const struct GNUNET_PeerIdentity *id;
- struct PeerPlan *pp;
- struct GSF_PendingRequestData *prd;
- struct GSF_RequestPlan *rp;
- struct GSF_PendingRequestPlanBijection *bi;
- struct MergeContext mpc;
- GNUNET_assert (NULL != cp);
- id = GSF_connected_peer_get_identity2_ (cp);
- pp = GNUNET_CONTAINER_multipeermap_get (plans, id);
- if (NULL == pp)
- {
- pp = GNUNET_new (struct PeerPlan);
- pp->plan_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
- pp->priority_heap =
- GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MAX);
- pp->delay_heap =
- GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- pp->cp = cp;
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (plans,
- id, pp,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- }
- mpc.merged = GNUNET_NO;
- mpc.pr = pr;
- GNUNET_CONTAINER_multihashmap_get_multiple (pp->plan_map,
- &GSF_pending_request_get_data_
- (pr)->query, &merge_pr, &mpc);
- if (GNUNET_NO != mpc.merged)
- return;
- GNUNET_CONTAINER_multihashmap_get_multiple (pp->plan_map,
- &GSF_pending_request_get_data_
- (pr)->query, &merge_pr, &mpc);
- if (GNUNET_NO != mpc.merged)
- return;
- plan_count++;
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# query plan entries"), 1,
- GNUNET_NO);
- prd = GSF_pending_request_get_data_ (pr);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Planning transmission of query `%s' to peer `%s'\n",
- GNUNET_h2s (&prd->query), GNUNET_i2s (id));
- rp = GNUNET_new (struct GSF_RequestPlan);
- bi = GNUNET_new (struct GSF_PendingRequestPlanBijection);
- bi->rp = rp;
- bi->pr = pr;
- GNUNET_CONTAINER_MDLL_insert (PR, prd->pr_head, prd->pr_tail, bi);
- GNUNET_CONTAINER_MDLL_insert (PE, rp->pe_head, rp->pe_tail, bi);
- rp->pp = pp;
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_put (pp->plan_map,
- get_rp_key (rp), rp,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
- plan (pp, rp);
- }
- /**
- * Notify the plan about a peer being no longer available;
- * destroy all entries associated with this peer.
- *
- * @param cp connected peer
- */
- void
- GSF_plan_notify_peer_disconnect_ (const struct GSF_ConnectedPeer *cp)
- {
- const struct GNUNET_PeerIdentity *id;
- struct PeerPlan *pp;
- struct GSF_RequestPlan *rp;
- struct GSF_PendingRequestData *prd;
- struct GSF_PendingRequestPlanBijection *bi;
- id = GSF_connected_peer_get_identity2_ (cp);
- pp = GNUNET_CONTAINER_multipeermap_get (plans, id);
- if (NULL == pp)
- return; /* nothing was ever planned for this peer */
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plans, id,
- pp));
- if (NULL != pp->pth)
- {
- GSF_peer_transmit_cancel_ (pp->pth);
- pp->pth = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != pp->task)
- {
- GNUNET_SCHEDULER_cancel (pp->task);
- pp->task = GNUNET_SCHEDULER_NO_TASK;
- }
- while (NULL != (rp = GNUNET_CONTAINER_heap_remove_root (pp->priority_heap)))
- {
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (pp->plan_map,
- get_rp_key (rp), rp));
- while (NULL != (bi = rp->pe_head))
- {
- GNUNET_CONTAINER_MDLL_remove (PE, rp->pe_head, rp->pe_tail, bi);
- prd = GSF_pending_request_get_data_ (bi->pr);
- GNUNET_CONTAINER_MDLL_remove (PR, prd->pr_head, prd->pr_tail, bi);
- GNUNET_free (bi);
- }
- plan_count--;
- GNUNET_free (rp);
- }
- GNUNET_CONTAINER_heap_destroy (pp->priority_heap);
- while (NULL != (rp = GNUNET_CONTAINER_heap_remove_root (pp->delay_heap)))
- {
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (pp->plan_map,
- get_rp_key (rp), rp));
- while (NULL != (bi = rp->pe_head))
- {
- prd = GSF_pending_request_get_data_ (bi->pr);
- GNUNET_CONTAINER_MDLL_remove (PE, rp->pe_head, rp->pe_tail, bi);
- GNUNET_CONTAINER_MDLL_remove (PR, prd->pr_head, prd->pr_tail, bi);
- GNUNET_free (bi);
- }
- plan_count--;
- GNUNET_free (rp);
- }
- GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# query plan entries"),
- plan_count, GNUNET_NO);
- GNUNET_CONTAINER_heap_destroy (pp->delay_heap);
- GNUNET_CONTAINER_multihashmap_destroy (pp->plan_map);
- GNUNET_free (pp);
- }
- /**
- * Get the last transmission attempt time for the request plan list
- * referenced by @a pr_head, that was sent to @a sender
- *
- * @param pr_head request plan reference list to check.
- * @param sender the peer that we've sent the request to.
- * @param result the timestamp to fill, set to #GNUNET_TIME_UNIT_FOREVER_ABS if never transmitted
- * @return #GNUNET_YES if @a result was changed, #GNUNET_NO otherwise.
- */
- int
- GSF_request_plan_reference_get_last_transmission_ (struct GSF_PendingRequestPlanBijection *pr_head,
- struct GSF_ConnectedPeer *sender,
- struct GNUNET_TIME_Absolute *result)
- {
- struct GSF_PendingRequestPlanBijection *bi;
- for (bi = pr_head; NULL != bi; bi = bi->next_PR)
- {
- if (bi->rp->pp->cp == sender)
- {
- if (0 == bi->rp->last_transmission.abs_value_us)
- *result = GNUNET_TIME_UNIT_FOREVER_ABS;
- else
- *result = bi->rp->last_transmission;
- return GNUNET_YES;
- }
- }
- return GNUNET_NO;
- }
- /**
- * Notify the plan about a request being done; destroy all entries
- * associated with this request.
- *
- * @param pr request that is done
- */
- void
- GSF_plan_notify_request_done_ (struct GSF_PendingRequest *pr)
- {
- struct GSF_RequestPlan *rp;
- struct GSF_PendingRequestData *prd;
- struct GSF_PendingRequestPlanBijection *bi;
- prd = GSF_pending_request_get_data_ (pr);
- while (NULL != (bi = prd->pr_head))
- {
- rp = bi->rp;
- GNUNET_CONTAINER_MDLL_remove (PR, prd->pr_head, prd->pr_tail, bi);
- GNUNET_CONTAINER_MDLL_remove (PE, rp->pe_head, rp->pe_tail, bi);
- if (NULL == rp->pe_head)
- {
- GNUNET_CONTAINER_heap_remove_node (rp->hn);
- plan_count--;
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (rp->pp->plan_map,
- &GSF_pending_request_get_data_
- (bi->pr)->query,
- rp));
- GNUNET_free (rp);
- }
- GNUNET_free (bi);
- }
- GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# query plan entries"),
- plan_count, GNUNET_NO);
- }
- /**
- * Initialize plan subsystem.
- */
- void
- GSF_plan_init ()
- {
- plans = GNUNET_CONTAINER_multipeermap_create (256, GNUNET_YES);
- }
- /**
- * Shutdown plan subsystem.
- */
- void
- GSF_plan_done ()
- {
- GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (plans));
- GNUNET_CONTAINER_multipeermap_destroy (plans);
- }
- /* end of gnunet-service-fs_pe.h */
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