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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_cp.c
- * @brief API to handle 'connected peers'
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_load_lib.h"
- #include "gnunet-service-fs.h"
- #include "gnunet-service-fs_cp.h"
- #include "gnunet-service-fs_pe.h"
- #include "gnunet-service-fs_pr.h"
- #include "gnunet-service-fs_push.h"
- #include "gnunet_peerstore_service.h"
- /**
- * Ratio for moving average delay calculation. The previous
- * average goes in with a factor of (n-1) into the calculation.
- * Must be > 0.
- */
- #define RUNAVG_DELAY_N 16
- /**
- * How often do we flush respect values to disk?
- */
- #define RESPECT_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
- /**
- * After how long do we discard a reply?
- */
- #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
- /**
- * Collect an instane number of statistics? May cause excessive IPC.
- */
- #define INSANE_STATISTICS GNUNET_NO
- /**
- * Handle to cancel a transmission request.
- */
- struct GSF_PeerTransmitHandle
- {
- /**
- * Kept in a doubly-linked list.
- */
- struct GSF_PeerTransmitHandle *next;
- /**
- * Kept in a doubly-linked list.
- */
- struct GSF_PeerTransmitHandle *prev;
- /**
- * Time when this transmission request was issued.
- */
- struct GNUNET_TIME_Absolute transmission_request_start_time;
- /**
- * Timeout for this request.
- */
- struct GNUNET_TIME_Absolute timeout;
- /**
- * Task called on timeout, or 0 for none.
- */
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
- /**
- * Function to call to get the actual message.
- */
- GSF_GetMessageCallback gmc;
- /**
- * Peer this request targets.
- */
- struct GSF_ConnectedPeer *cp;
- /**
- * Closure for @e gmc.
- */
- void *gmc_cls;
- /**
- * Size of the message to be transmitted.
- */
- size_t size;
- /**
- * #GNUNET_YES if this is a query, #GNUNET_NO for content.
- */
- int is_query;
- /**
- * Did we get a reservation already?
- */
- int was_reserved;
- /**
- * Priority of this request.
- */
- uint32_t priority;
- };
- /**
- * Handle for an entry in our delay list.
- */
- struct GSF_DelayedHandle
- {
- /**
- * Kept in a doubly-linked list.
- */
- struct GSF_DelayedHandle *next;
- /**
- * Kept in a doubly-linked list.
- */
- struct GSF_DelayedHandle *prev;
- /**
- * Peer this transmission belongs to.
- */
- struct GSF_ConnectedPeer *cp;
- /**
- * The PUT that was delayed.
- */
- struct PutMessage *pm;
- /**
- * Task for the delay.
- */
- GNUNET_SCHEDULER_TaskIdentifier delay_task;
- /**
- * Size of the message.
- */
- size_t msize;
- };
- /**
- * Information per peer and request.
- */
- struct PeerRequest
- {
- /**
- * Handle to generic request.
- */
- struct GSF_PendingRequest *pr;
- /**
- * Handle to specific peer.
- */
- struct GSF_ConnectedPeer *cp;
- /**
- * Task for asynchronous stopping of this request.
- */
- GNUNET_SCHEDULER_TaskIdentifier kill_task;
- };
- /**
- * A connected peer.
- */
- struct GSF_ConnectedPeer
- {
- /**
- * Performance data for this peer.
- */
- struct GSF_PeerPerformanceData ppd;
- /**
- * Time until when we blocked this peer from migrating
- * data to us.
- */
- struct GNUNET_TIME_Absolute last_migration_block;
- /**
- * Task scheduled to revive migration to this peer.
- */
- GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
- /**
- * Messages (replies, queries, content migration) we would like to
- * send to this peer in the near future. Sorted by priority, head.
- */
- struct GSF_PeerTransmitHandle *pth_head;
- /**
- * Messages (replies, queries, content migration) we would like to
- * send to this peer in the near future. Sorted by priority, tail.
- */
- struct GSF_PeerTransmitHandle *pth_tail;
- /**
- * Messages (replies, queries, content migration) we would like to
- * send to this peer in the near future. Sorted by priority, head.
- */
- struct GSF_DelayedHandle *delayed_head;
- /**
- * Messages (replies, queries, content migration) we would like to
- * send to this peer in the near future. Sorted by priority, tail.
- */
- struct GSF_DelayedHandle *delayed_tail;
- /**
- * Migration stop message in our queue, or NULL if we have none pending.
- */
- struct GSF_PeerTransmitHandle *migration_pth;
- /**
- * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
- */
- struct GNUNET_ATS_ReservationContext *rc;
- /**
- * Task scheduled if we need to retry bandwidth reservation later.
- */
- GNUNET_SCHEDULER_TaskIdentifier rc_delay_task;
- /**
- * Active requests from this neighbour, map of query to 'struct PeerRequest'.
- */
- struct GNUNET_CONTAINER_MultiHashMap *request_map;
- /**
- * Handle for an active request for transmission to this
- * peer, or NULL (if core queue was full).
- */
- struct GNUNET_CORE_TransmitHandle *cth;
- /**
- * Increase in traffic preference still to be submitted
- * to the core service for this peer.
- */
- uint64_t inc_preference;
- /**
- * Set to 1 if we're currently in the process of calling
- * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
- * NULL, we should not call notify_transmit_ready for this
- * handle right now).
- */
- unsigned int cth_in_progress;
- /**
- * Respect rating for this peer on disk.
- */
- uint32_t disk_respect;
- /**
- * Which offset in "last_p2p_replies" will be updated next?
- * (we go round-robin).
- */
- unsigned int last_p2p_replies_woff;
- /**
- * Which offset in "last_client_replies" will be updated next?
- * (we go round-robin).
- */
- unsigned int last_client_replies_woff;
- /**
- * Current offset into 'last_request_times' ring buffer.
- */
- unsigned int last_request_times_off;
- /**
- * GNUNET_YES if we did successfully reserve 32k bandwidth,
- * GNUNET_NO if not.
- */
- int did_reserve;
- /**
- * Function called when the creation of this record is complete.
- */
- GSF_ConnectedPeerCreationCallback creation_cb;
- /**
- * Closure for @e creation_cb
- */
- void *creation_cb_cls;
- /**
- * Handle to the PEERSTORE iterate request for peer respect value
- */
- struct GNUNET_PEERSTORE_IterateContext *respect_iterate_req;
- };
- /**
- * Map from peer identities to 'struct GSF_ConnectPeer' entries.
- */
- static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
- /**
- * Handle to peerstore service.
- */
- static struct GNUNET_PEERSTORE_Handle *peerstore;
- /**
- * Update the latency information kept for the given peer.
- *
- * @param id peer record to update
- * @param latency current latency value
- */
- void
- GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
- struct GNUNET_TIME_Relative latency)
- {
- struct GSF_ConnectedPeer *cp;
- cp = GSF_peer_get_ (id);
- if (NULL == cp)
- return; /* we're not yet connected at the core level, ignore */
- GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
- /* LATER: merge atsi into cp's performance data (if we ever care...) */
- }
- /**
- * Return the performance data record for the given peer
- *
- * @param cp peer to query
- * @return performance data record for the peer
- */
- struct GSF_PeerPerformanceData *
- GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
- {
- return &cp->ppd;
- }
- /**
- * Core is ready to transmit to a peer, get the message.
- *
- * @param cls the 'struct GSF_PeerTransmitHandle' of the message
- * @param size number of bytes core is willing to take
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
- static size_t
- peer_transmit_ready_cb (void *cls, size_t size, void *buf);
- /**
- * Function called by core upon success or failure of our bandwidth reservation request.
- *
- * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
- * @param peer identifies the peer
- * @param amount set to the amount that was actually reserved or unreserved;
- * either the full requested amount or zero (no partial reservations)
- * @param res_delay if the reservation could not be satisfied (amount was 0), how
- * long should the client wait until re-trying?
- */
- static void
- ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
- int32_t amount, struct GNUNET_TIME_Relative res_delay);
- /**
- * If ready (bandwidth reserved), try to schedule transmission via
- * core for the given handle.
- *
- * @param pth transmission handle to schedule
- */
- static void
- schedule_transmission (struct GSF_PeerTransmitHandle *pth)
- {
- struct GSF_ConnectedPeer *cp;
- struct GNUNET_PeerIdentity target;
- cp = pth->cp;
- if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
- return; /* already done */
- GNUNET_assert (0 != cp->ppd.pid);
- GNUNET_PEER_resolve (cp->ppd.pid, &target);
- if (0 != cp->inc_preference)
- {
- GNUNET_ATS_performance_change_preference (GSF_ats, &target, GNUNET_ATS_PREFERENCE_BANDWIDTH,
- (double) cp->inc_preference,
- GNUNET_ATS_PREFERENCE_END);
- cp->inc_preference = 0;
- }
- if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
- {
- /* query, need reservation */
- if (GNUNET_YES != cp->did_reserve)
- return; /* not ready */
- cp->did_reserve = GNUNET_NO;
- /* reservation already done! */
- pth->was_reserved = GNUNET_YES;
- cp->rc =
- GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
- &ats_reserve_callback, cp);
- return;
- }
- GNUNET_assert (NULL == cp->cth);
- cp->cth_in_progress++;
- cp->cth =
- GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
- GNUNET_CORE_PRIO_BACKGROUND,
- GNUNET_TIME_absolute_get_remaining
- (pth->timeout), &target, pth->size,
- &peer_transmit_ready_cb, cp);
- GNUNET_assert (NULL != cp->cth);
- GNUNET_assert (0 < cp->cth_in_progress--);
- }
- /**
- * Core is ready to transmit to a peer, get the message.
- *
- * @param cls the 'struct GSF_PeerTransmitHandle' of the message
- * @param size number of bytes core is willing to take
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
- static size_t
- peer_transmit_ready_cb (void *cls, size_t size, void *buf)
- {
- struct GSF_ConnectedPeer *cp = cls;
- struct GSF_PeerTransmitHandle *pth = cp->pth_head;
- struct GSF_PeerTransmitHandle *pos;
- size_t ret;
- cp->cth = NULL;
- if (NULL == pth)
- return 0;
- if (pth->size > size)
- {
- schedule_transmission (pth);
- return 0;
- }
- if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (pth->timeout_task);
- pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
- if (GNUNET_YES == pth->is_query)
- {
- cp->ppd.last_request_times[(cp->last_request_times_off++) %
- MAX_QUEUE_PER_PEER] =
- GNUNET_TIME_absolute_get ();
- GNUNET_assert (0 < cp->ppd.pending_queries--);
- }
- else if (GNUNET_NO == pth->is_query)
- {
- GNUNET_assert (0 < cp->ppd.pending_replies--);
- }
- GNUNET_LOAD_update (cp->ppd.transmission_delay,
- GNUNET_TIME_absolute_get_duration
- (pth->transmission_request_start_time).rel_value_us);
- ret = pth->gmc (pth->gmc_cls, size, buf);
- if (NULL != (pos = cp->pth_head))
- {
- GNUNET_assert (pos != pth);
- schedule_transmission (pos);
- }
- GNUNET_free (pth);
- return ret;
- }
- /**
- * (re)try to reserve bandwidth from the given peer.
- *
- * @param cls the 'struct GSF_ConnectedPeer' to reserve from
- * @param tc scheduler context
- */
- static void
- retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GSF_ConnectedPeer *cp = cls;
- struct GNUNET_PeerIdentity target;
- GNUNET_PEER_resolve (cp->ppd.pid, &target);
- cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
- cp->rc =
- GNUNET_ATS_reserve_bandwidth (GSF_ats, &target, DBLOCK_SIZE,
- &ats_reserve_callback, cp);
- }
- /**
- * Function called by core upon success or failure of our bandwidth reservation request.
- *
- * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
- * @param peer identifies the peer
- * @param amount set to the amount that was actually reserved or unreserved;
- * either the full requested amount or zero (no partial reservations)
- * @param res_delay if the reservation could not be satisfied (amount was 0), how
- * long should the client wait until re-trying?
- */
- static void
- ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
- int32_t amount, struct GNUNET_TIME_Relative res_delay)
- {
- struct GSF_ConnectedPeer *cp = cls;
- struct GSF_PeerTransmitHandle *pth;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Reserved %d bytes / need to wait %s for reservation\n",
- (int) amount,
- GNUNET_STRINGS_relative_time_to_string (res_delay, GNUNET_YES));
- cp->rc = NULL;
- if (0 == amount)
- {
- cp->rc_delay_task =
- GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
- return;
- }
- cp->did_reserve = GNUNET_YES;
- pth = cp->pth_head;
- if ((NULL != pth) && (NULL == cp->cth) && (0 == cp->cth_in_progress))
- {
- /* reservation success, try transmission now! */
- cp->cth_in_progress++;
- cp->cth =
- GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES,
- GNUNET_CORE_PRIO_BACKGROUND,
- GNUNET_TIME_absolute_get_remaining
- (pth->timeout), peer, pth->size,
- &peer_transmit_ready_cb, cp);
- GNUNET_assert (NULL != cp->cth);
- GNUNET_assert (0 < cp->cth_in_progress--);
- }
- }
- /**
- * Function called by PEERSTORE with peer respect record
- *
- * @param cls handle to connected peer entry
- * @param record peerstore record information
- * @param emsg error message, or NULL if no errors
- * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
- */
- static int
- peer_respect_cb (void *cls, struct GNUNET_PEERSTORE_Record *record, char *emsg)
- {
- struct GSF_ConnectedPeer *cp = cls;
- cp->respect_iterate_req = NULL;
- if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
- cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
- GSF_push_start_ (cp);
- if (NULL != cp->creation_cb)
- cp->creation_cb (cp->creation_cb_cls, cp);
- return GNUNET_NO;
- }
- /**
- * A peer connected to us. Setup the connected peer
- * records.
- *
- * @param peer identity of peer that connected
- * @param creation_cb callback function when the record is created.
- * @param creation_cb_cls closure for @creation_cb
- */
- void
- GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
- GSF_ConnectedPeerCreationCallback creation_cb,
- void *creation_cb_cls)
- {
- struct GSF_ConnectedPeer *cp;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s\n",
- GNUNET_i2s (peer));
- cp = GNUNET_new (struct GSF_ConnectedPeer);
- cp->ppd.pid = GNUNET_PEER_intern (peer);
- cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
- cp->rc =
- GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
- &ats_reserve_callback, cp);
- cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
- GNUNET_break (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (cp_map,
- GSF_connected_peer_get_identity2_ (cp),
- cp,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
- GNUNET_CONTAINER_multipeermap_size (cp_map),
- GNUNET_NO);
- cp->creation_cb = creation_cb;
- cp->creation_cb_cls = creation_cb_cls;
- cp->respect_iterate_req =
- GNUNET_PEERSTORE_iterate (peerstore, "fs", peer, "respect",
- GNUNET_TIME_UNIT_FOREVER_REL, &peer_respect_cb,
- cp);
- }
- /**
- * It may be time to re-start migrating content to this
- * peer. Check, and if so, restart migration.
- *
- * @param cls the 'struct GSF_ConnectedPeer'
- * @param tc scheduler context
- */
- static void
- revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GSF_ConnectedPeer *cp = cls;
- struct GNUNET_TIME_Relative bt;
- cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
- bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
- if (0 != bt.rel_value_us)
- {
- /* still time left... */
- cp->mig_revive_task =
- GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
- return;
- }
- GSF_push_start_ (cp);
- }
- /**
- * Get a handle for a connected peer.
- *
- * @param peer peer's identity
- * @return NULL if the peer is not currently connected
- */
- struct GSF_ConnectedPeer *
- GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
- {
- if (NULL == cp_map)
- return NULL;
- return GNUNET_CONTAINER_multipeermap_get (cp_map, peer);
- }
- /**
- * Handle P2P "MIGRATION_STOP" message.
- *
- * @param cls closure, always NULL
- * @param other the other peer involved (sender or receiver, NULL
- * for loopback messages where we are both sender and receiver)
- * @param message the actual message
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
- int
- GSF_handle_p2p_migration_stop_ (void *cls,
- const struct GNUNET_PeerIdentity *other,
- const struct GNUNET_MessageHeader *message)
- {
- struct GSF_ConnectedPeer *cp;
- const struct MigrationStopMessage *msm;
- struct GNUNET_TIME_Relative bt;
- msm = (const struct MigrationStopMessage *) message;
- cp = GSF_peer_get_ (other);
- if (NULL == cp)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop ("# migration stop messages received"),
- 1, GNUNET_NO);
- bt = GNUNET_TIME_relative_ntoh (msm->duration);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Migration of content to peer `%s' blocked for %s\n"),
- GNUNET_i2s (other),
- GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
- cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
- if (GNUNET_SCHEDULER_NO_TASK == cp->mig_revive_task)
- {
- GSF_push_stop_ (cp);
- cp->mig_revive_task =
- GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
- }
- return GNUNET_OK;
- }
- /**
- * Copy reply and free put message.
- *
- * @param cls the 'struct PutMessage'
- * @param buf_size number of bytes available in 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
- copy_reply (void *cls, size_t buf_size, void *buf)
- {
- struct PutMessage *pm = cls;
- size_t size;
- if (NULL != buf)
- {
- GNUNET_assert (buf_size >= ntohs (pm->header.size));
- size = ntohs (pm->header.size);
- memcpy (buf, pm, size);
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# replies transmitted to other peers"), 1,
- GNUNET_NO);
- }
- else
- {
- size = 0;
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
- GNUNET_NO);
- }
- GNUNET_free (pm);
- return size;
- }
- /**
- * Free resources associated with the given peer request.
- *
- * @param peerreq request to free
- * @param query associated key for the request
- */
- static void
- free_pending_request (struct PeerRequest *peerreq,
- const struct GNUNET_HashCode *query)
- {
- struct GSF_ConnectedPeer *cp = peerreq->cp;
- if (GNUNET_SCHEDULER_NO_TASK != peerreq->kill_task)
- {
- GNUNET_SCHEDULER_cancel (peerreq->kill_task);
- peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
- -1, GNUNET_NO);
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
- query, peerreq));
- GNUNET_free (peerreq);
- }
- /**
- * Cancel all requests associated with the peer.
- *
- * @param cls unused
- * @param query hash code of the request
- * @param value the 'struct GSF_PendingRequest'
- * @return GNUNET_YES (continue to iterate)
- */
- static int
- cancel_pending_request (void *cls, const struct GNUNET_HashCode * query, void *value)
- {
- struct PeerRequest *peerreq = value;
- struct GSF_PendingRequest *pr = peerreq->pr;
- struct GSF_PendingRequestData *prd;
- prd = GSF_pending_request_get_data_ (pr);
- GSF_pending_request_cancel_ (pr, GNUNET_NO);
- free_pending_request (peerreq, &prd->query);
- return GNUNET_OK;
- }
- /**
- * Free the given request.
- *
- * @param cls the request to free
- * @param tc task context
- */
- static void
- peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct PeerRequest *peerreq = cls;
- struct GSF_PendingRequest *pr = peerreq->pr;
- struct GSF_PendingRequestData *prd;
- peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
- prd = GSF_pending_request_get_data_ (pr);
- cancel_pending_request (NULL, &prd->query, peerreq);
- }
- /**
- * The artificial delay is over, transmit the message now.
- *
- * @param cls the 'struct GSF_DelayedHandle' with the message
- * @param tc scheduler context
- */
- static void
- transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GSF_DelayedHandle *dh = cls;
- struct GSF_ConnectedPeer *cp = dh->cp;
- GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
- if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
- {
- GNUNET_free (dh->pm);
- GNUNET_free (dh);
- return;
- }
- (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
- dh->msize, ©_reply, dh->pm);
- GNUNET_free (dh);
- }
- /**
- * Get the randomized delay a response should be subjected to.
- *
- * @return desired delay
- */
- static struct GNUNET_TIME_Relative
- get_randomized_delay ()
- {
- struct GNUNET_TIME_Relative ret;
- ret =
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
- GNUNET_CRYPTO_random_u32
- (GNUNET_CRYPTO_QUALITY_WEAK,
- 2 * GSF_avg_latency.rel_value_us + 1));
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# artificial delays introduced (ms)"),
- ret.rel_value_us / 1000LL, GNUNET_NO);
- #endif
- return ret;
- }
- /**
- * Handle a reply to a pending request. Also called if a request
- * expires (then with data == NULL). The handler may be called
- * many times (depending on the request type), but will not be
- * called during or after a call to GSF_pending_request_cancel
- * and will also not be called anymore after a call signalling
- * expiration.
- *
- * @param cls 'struct PeerRequest' this is an answer for
- * @param eval evaluation of the result
- * @param pr handle to the original pending request
- * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
- * @param expiration when does 'data' expire?
- * @param last_transmission when did we last transmit a request for this block
- * @param type type of the block
- * @param data response data, NULL on request expiration
- * @param data_len number of bytes in data
- */
- static void
- handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
- struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
- struct GNUNET_TIME_Absolute expiration,
- struct GNUNET_TIME_Absolute last_transmission,
- enum GNUNET_BLOCK_Type type, const void *data,
- size_t data_len)
- {
- struct PeerRequest *peerreq = cls;
- struct GSF_ConnectedPeer *cp = peerreq->cp;
- struct GSF_PendingRequestData *prd;
- struct PutMessage *pm;
- size_t msize;
- GNUNET_assert (data_len + sizeof (struct PutMessage) <
- GNUNET_SERVER_MAX_MESSAGE_SIZE);
- GNUNET_assert (peerreq->pr == pr);
- prd = GSF_pending_request_get_data_ (pr);
- if (NULL == data)
- {
- free_pending_request (peerreq, &prd->query);
- return;
- }
- GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
- if ((prd->type != type) && (GNUNET_BLOCK_TYPE_ANY != prd->type))
- {
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# replies dropped due to type mismatch"),
- 1, GNUNET_NO);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting result for query `%s' to peer\n",
- GNUNET_h2s (&prd->query));
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop ("# replies received for other peers"),
- 1, GNUNET_NO);
- msize = sizeof (struct PutMessage) + data_len;
- if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- if ((UINT32_MAX != reply_anonymity_level) && (reply_anonymity_level > 1))
- {
- if (reply_anonymity_level - 1 > GSF_cover_content_count)
- {
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# replies dropped due to insufficient cover traffic"),
- 1, GNUNET_NO);
- return;
- }
- GSF_cover_content_count -= (reply_anonymity_level - 1);
- }
- pm = GNUNET_malloc (msize);
- pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
- pm->header.size = htons (msize);
- pm->type = htonl (type);
- pm->expiration = GNUNET_TIME_absolute_hton (expiration);
- memcpy (&pm[1], data, data_len);
- if ((UINT32_MAX != reply_anonymity_level) && (0 != reply_anonymity_level) &&
- (GNUNET_YES == GSF_enable_randomized_delays))
- {
- struct GSF_DelayedHandle *dh;
- dh = GNUNET_new (struct GSF_DelayedHandle);
- dh->cp = cp;
- dh->pm = pm;
- dh->msize = msize;
- GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
- dh->delay_task =
- GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
- &transmit_delayed_now, dh);
- }
- else
- {
- (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
- ©_reply, pm);
- }
- if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
- return;
- if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
- {
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# P2P searches destroyed due to ultimate reply"),
- 1, GNUNET_NO);
- peerreq->kill_task =
- GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
- }
- }
- /**
- * Increase the peer's respect by a value.
- *
- * @param cp which peer to change the respect value on
- * @param value is the int value by which the
- * peer's credit is to be increased or decreased
- * @returns the actual change in respect (positive or negative)
- */
- static int
- change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
- {
- if (0 == value)
- return 0;
- GNUNET_assert (NULL != cp);
- if (value > 0)
- {
- if (cp->ppd.respect + value < cp->ppd.respect)
- {
- value = UINT32_MAX - cp->ppd.respect;
- cp->ppd.respect = UINT32_MAX;
- }
- else
- cp->ppd.respect += value;
- }
- else
- {
- if (cp->ppd.respect < -value)
- {
- value = -cp->ppd.respect;
- cp->ppd.respect = 0;
- }
- else
- cp->ppd.respect += value;
- }
- return value;
- }
- /**
- * We've received a request with the specified priority. Bound it
- * according to how much we respect the given peer.
- *
- * @param prio_in requested priority
- * @param cp the peer making the request
- * @return effective priority
- */
- static int32_t
- bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
- {
- #define N ((double)128.0)
- uint32_t ret;
- double rret;
- int ld;
- ld = GSF_test_get_load_too_high_ (0);
- if (GNUNET_SYSERR == ld)
- {
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests done for free (low load)"), 1,
- GNUNET_NO);
- #endif
- return 0; /* excess resources */
- }
- if (prio_in > INT32_MAX)
- prio_in = INT32_MAX;
- ret = -change_peer_respect (cp, -(int) prio_in);
- if (ret > 0)
- {
- if (ret > GSF_current_priorities + N)
- rret = GSF_current_priorities + N;
- else
- rret = ret;
- GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
- }
- if ((GNUNET_YES == ld) && (ret > 0))
- {
- /* try with charging */
- ld = GSF_test_get_load_too_high_ (ret);
- }
- if (GNUNET_YES == ld)
- {
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# request dropped, priority insufficient"), 1,
- GNUNET_NO);
- /* undo charge */
- change_peer_respect (cp, (int) ret);
- return -1; /* not enough resources */
- }
- else
- {
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests done for a price (normal load)"), 1,
- GNUNET_NO);
- }
- #undef N
- return ret;
- }
- /**
- * The priority level imposes a bound on the maximum
- * value for the ttl that can be requested.
- *
- * @param ttl_in requested ttl
- * @param prio given priority
- * @return ttl_in if ttl_in is below the limit,
- * otherwise the ttl-limit for the given priority
- */
- static int32_t
- bound_ttl (int32_t ttl_in, uint32_t prio)
- {
- unsigned long long allowed;
- if (ttl_in <= 0)
- return ttl_in;
- allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
- if (ttl_in > allowed)
- {
- if (allowed >= (1 << 30))
- return 1 << 30;
- return allowed;
- }
- return ttl_in;
- }
- /**
- * Handle P2P "QUERY" message. Creates the pending request entry
- * and sets up all of the data structures to that we will
- * process replies properly. Does not initiate forwarding or
- * local database lookups.
- *
- * @param other the other peer involved (sender or receiver, NULL
- * for loopback messages where we are both sender and receiver)
- * @param message the actual message
- * @return pending request handle, NULL on error
- */
- struct GSF_PendingRequest *
- GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
- const struct GNUNET_MessageHeader *message)
- {
- struct PeerRequest *peerreq;
- struct GSF_PendingRequest *pr;
- struct GSF_PendingRequestData *prd;
- struct GSF_ConnectedPeer *cp;
- struct GSF_ConnectedPeer *cps;
- const struct GNUNET_PeerIdentity *target;
- enum GSF_PendingRequestOptions options;
- uint16_t msize;
- const struct GetMessage *gm;
- unsigned int bits;
- const struct GNUNET_PeerIdentity *opt;
- uint32_t bm;
- size_t bfsize;
- uint32_t ttl_decrement;
- int32_t priority;
- int32_t ttl;
- enum GNUNET_BLOCK_Type type;
- GNUNET_PEER_Id spid;
- GNUNET_assert (other != NULL);
- msize = ntohs (message->size);
- if (msize < sizeof (struct GetMessage))
- {
- GNUNET_break_op (0);
- return NULL;
- }
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# GET requests received (from other peers)"), 1,
- GNUNET_NO);
- gm = (const struct GetMessage *) message;
- type = ntohl (gm->type);
- bm = ntohl (gm->hash_bitmap);
- bits = 0;
- while (bm > 0)
- {
- if (1 == (bm & 1))
- bits++;
- bm >>= 1;
- }
- if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
- {
- GNUNET_break_op (0);
- return NULL;
- }
- opt = (const struct GNUNET_PeerIdentity *) &gm[1];
- bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
- /* bfsize must be power of 2, check! */
- if (0 != ((bfsize - 1) & bfsize))
- {
- GNUNET_break_op (0);
- return NULL;
- }
- GSF_cover_query_count++;
- bm = ntohl (gm->hash_bitmap);
- bits = 0;
- cps = GSF_peer_get_ (other);
- if (NULL == cps)
- {
- /* peer must have just disconnected */
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests dropped due to initiator not being connected"),
- 1, GNUNET_NO);
- return NULL;
- }
- if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
- cp = GSF_peer_get_ (&opt[bits++]);
- else
- cp = cps;
- if (NULL == cp)
- {
- if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
- GNUNET_i2s (&opt[bits - 1]));
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to find peer `%4s' in connection set. Dropping query.\n",
- GNUNET_i2s (other));
- #if INSANE_STATISTICS
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests dropped due to missing reverse route"),
- 1, GNUNET_NO);
- #endif
- return NULL;
- }
- /* note that we can really only check load here since otherwise
- * peers could find out that we are overloaded by not being
- * disconnected after sending us a malformed query... */
- priority = bound_priority (ntohl (gm->priority), cps);
- if (priority < 0)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Dropping query from `%s', this peer is too busy.\n",
- GNUNET_i2s (other));
- return NULL;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
- GNUNET_h2s (&gm->query),
- (unsigned int) type,
- GNUNET_i2s (other),
- (unsigned int) bm);
- target =
- (0 !=
- (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
- options = GSF_PRO_DEFAULTS;
- spid = 0;
- if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
- || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
- GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
- GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
- {
- /* don't have BW to send to peer, or would likely take longer than we have for it,
- * so at best indirect the query */
- priority = 0;
- options |= GSF_PRO_FORWARD_ONLY;
- spid = GNUNET_PEER_intern (other);
- GNUNET_assert (0 != spid);
- }
- ttl = bound_ttl (ntohl (gm->ttl), priority);
- /* decrement ttl (always) */
- ttl_decrement =
- 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- TTL_DECREMENT);
- if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
- GNUNET_i2s (other), ttl, ttl_decrement);
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests dropped due TTL underflow"), 1,
- GNUNET_NO);
- /* integer underflow => drop (should be very rare)! */
- return NULL;
- }
- ttl -= ttl_decrement;
- /* test if the request already exists */
- peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
- if (peerreq != NULL)
- {
- pr = peerreq->pr;
- prd = GSF_pending_request_get_data_ (pr);
- if (prd->type == type)
- {
- if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
- {
- /* existing request has higher TTL, drop new one! */
- prd->priority += priority;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Have existing request with higher TTL, dropping new request.\n",
- GNUNET_i2s (other));
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# requests dropped due to higher-TTL request"),
- 1, GNUNET_NO);
- return NULL;
- }
- /* existing request has lower TTL, drop old one! */
- priority += prd->priority;
- GSF_pending_request_cancel_ (pr, GNUNET_YES);
- free_pending_request (peerreq, &gm->query);
- }
- }
- peerreq = GNUNET_new (struct PeerRequest);
- peerreq->cp = cp;
- pr = GSF_pending_request_create_ (options, type, &gm->query,
- target,
- (bfsize >
- 0) ? (const char *) &opt[bits] : NULL,
- bfsize, ntohl (gm->filter_mutator),
- 1 /* anonymity */ ,
- (uint32_t) priority, ttl, spid, GNUNET_PEER_intern (other), NULL, 0, /* replies_seen */
- &handle_p2p_reply, peerreq);
- GNUNET_assert (NULL != pr);
- peerreq->pr = pr;
- GNUNET_break (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
- peerreq,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop
- ("# P2P query messages received and processed"), 1,
- GNUNET_NO);
- GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
- 1, GNUNET_NO);
- return pr;
- }
- /**
- * Function called if there has been a timeout trying to satisfy
- * a transmission request.
- *
- * @param cls the 'struct GSF_PeerTransmitHandle' of the request
- * @param tc scheduler context
- */
- static void
- peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GSF_PeerTransmitHandle *pth = cls;
- struct GSF_ConnectedPeer *cp;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout trying to transmit to other peer\n");
- pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- cp = pth->cp;
- GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
- if (GNUNET_YES == pth->is_query)
- GNUNET_assert (0 < cp->ppd.pending_queries--);
- else if (GNUNET_NO == pth->is_query)
- GNUNET_assert (0 < cp->ppd.pending_replies--);
- GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
- if (NULL != cp->cth)
- {
- GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
- cp->cth = NULL;
- }
- pth->gmc (pth->gmc_cls, 0, NULL);
- GNUNET_assert (0 == cp->cth_in_progress);
- GNUNET_free (pth);
- }
- /**
- * Transmit a message to the given peer as soon as possible.
- * If the peer disconnects before the transmission can happen,
- * the callback is invoked with a `NULL` @a buffer.
- *
- * @param cp target peer
- * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
- * @param priority how important is this request?
- * @param timeout when does this request timeout (call gmc with error)
- * @param size number of bytes we would like to send to the peer
- * @param gmc function to call to get the message
- * @param gmc_cls closure for @a gmc
- * @return handle to cancel request
- */
- struct GSF_PeerTransmitHandle *
- GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
- uint32_t priority, struct GNUNET_TIME_Relative timeout,
- size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
- {
- struct GSF_PeerTransmitHandle *pth;
- struct GSF_PeerTransmitHandle *pos;
- struct GSF_PeerTransmitHandle *prev;
- pth = GNUNET_new (struct GSF_PeerTransmitHandle);
- pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
- pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- pth->gmc = gmc;
- pth->gmc_cls = gmc_cls;
- pth->size = size;
- pth->is_query = is_query;
- pth->priority = priority;
- pth->cp = cp;
- /* insertion sort (by priority, descending) */
- prev = NULL;
- pos = cp->pth_head;
- while ((NULL != pos) && (pos->priority > priority))
- {
- prev = pos;
- pos = pos->next;
- }
- GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
- if (GNUNET_YES == is_query)
- cp->ppd.pending_queries++;
- else if (GNUNET_NO == is_query)
- cp->ppd.pending_replies++;
- pth->timeout_task =
- GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
- schedule_transmission (pth);
- return pth;
- }
- /**
- * Cancel an earlier request for transmission.
- *
- * @param pth request to cancel
- */
- void
- GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
- {
- struct GSF_ConnectedPeer *cp;
- if (GNUNET_SCHEDULER_NO_TASK != pth->timeout_task)
- {
- GNUNET_SCHEDULER_cancel (pth->timeout_task);
- pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- cp = pth->cp;
- GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
- if (GNUNET_YES == pth->is_query)
- GNUNET_assert (0 < cp->ppd.pending_queries--);
- else if (GNUNET_NO == pth->is_query)
- GNUNET_assert (0 < cp->ppd.pending_replies--);
- GNUNET_free (pth);
- }
- /**
- * Report on receiving a reply; update the performance record of the given peer.
- *
- * @param cp responding peer (will be updated)
- * @param request_time time at which the original query was transmitted
- * @param request_priority priority of the original request
- */
- void
- GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
- struct GNUNET_TIME_Absolute request_time,
- uint32_t request_priority)
- {
- struct GNUNET_TIME_Relative delay;
- delay = GNUNET_TIME_absolute_get_duration (request_time);
- cp->ppd.avg_reply_delay.rel_value_us =
- (cp->ppd.avg_reply_delay.rel_value_us * (RUNAVG_DELAY_N - 1) +
- delay.rel_value_us) / RUNAVG_DELAY_N;
- cp->ppd.avg_priority =
- (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
- request_priority) / RUNAVG_DELAY_N;
- }
- /**
- * Report on receiving a reply in response to an initiating client.
- * Remember that this peer is good for this client.
- *
- * @param cp responding peer (will be updated)
- * @param initiator_client local client on responsible for query
- */
- void
- GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
- struct GSF_LocalClient *initiator_client)
- {
- cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
- CS2P_SUCCESS_LIST_SIZE] = initiator_client;
- }
- /**
- * Report on receiving a reply in response to an initiating peer.
- * Remember that this peer is good for this initiating peer.
- *
- * @param cp responding peer (will be updated)
- * @param initiator_peer other peer responsible for query
- */
- void
- GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
- const struct GSF_ConnectedPeer *initiator_peer)
- {
- unsigned int woff;
- woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
- GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
- cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
- GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
- cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
- }
- /**
- * A peer disconnected from us. Tear down the connected peer
- * record.
- *
- * @param cls unused
- * @param peer identity of peer that connected
- */
- void
- GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
- {
- struct GSF_ConnectedPeer *cp;
- struct GSF_PeerTransmitHandle *pth;
- struct GSF_DelayedHandle *dh;
- cp = GSF_peer_get_ (peer);
- if (NULL == cp)
- return; /* must have been disconnect from core with
- * 'peer' == my_id, ignore */
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (cp_map,
- peer,
- cp));
- GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
- GNUNET_CONTAINER_multipeermap_size (cp_map),
- GNUNET_NO);
- if (NULL != cp->respect_iterate_req)
- {
- GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
- cp->respect_iterate_req = NULL;
- }
- if (NULL != cp->migration_pth)
- {
- GSF_peer_transmit_cancel_ (cp->migration_pth);
- cp->migration_pth = NULL;
- }
- if (NULL != cp->rc)
- {
- GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
- cp->rc = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != cp->rc_delay_task)
- {
- GNUNET_SCHEDULER_cancel (cp->rc_delay_task);
- cp->rc_delay_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
- &cancel_pending_request, cp);
- GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
- cp->request_map = NULL;
- GSF_plan_notify_peer_disconnect_ (cp);
- GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
- GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
- memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
- GSF_push_stop_ (cp);
- if (NULL != cp->cth)
- {
- GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
- cp->cth = NULL;
- }
- GNUNET_assert (0 == cp->cth_in_progress);
- while (NULL != (pth = cp->pth_head))
- {
- if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (pth->timeout_task);
- pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
- pth->gmc (pth->gmc_cls, 0, NULL);
- GNUNET_free (pth);
- }
- while (NULL != (dh = cp->delayed_head))
- {
- GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
- GNUNET_SCHEDULER_cancel (dh->delay_task);
- GNUNET_free (dh->pm);
- GNUNET_free (dh);
- }
- GNUNET_PEER_change_rc (cp->ppd.pid, -1);
- if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
- {
- GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
- cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free (cp);
- }
- /**
- * Closure for 'call_iterator'.
- */
- struct IterationContext
- {
- /**
- * Function to call on each entry.
- */
- GSF_ConnectedPeerIterator it;
- /**
- * Closure for 'it'.
- */
- void *it_cls;
- };
- /**
- * Function that calls the callback for each peer.
- *
- * @param cls the `struct IterationContext *`
- * @param key identity of the peer
- * @param value the `struct GSF_ConnectedPeer *`
- * @return #GNUNET_YES to continue iteration
- */
- static int
- call_iterator (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
- {
- struct IterationContext *ic = cls;
- struct GSF_ConnectedPeer *cp = value;
- ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
- return GNUNET_YES;
- }
- /**
- * Iterate over all connected peers.
- *
- * @param it function to call for each peer
- * @param it_cls closure for @a it
- */
- void
- GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
- {
- struct IterationContext ic;
- ic.it = it;
- ic.it_cls = it_cls;
- GNUNET_CONTAINER_multipeermap_iterate (cp_map, &call_iterator, &ic);
- }
- /**
- * Obtain the identity of a connected peer.
- *
- * @param cp peer to get identity of
- * @param id identity to set (written to)
- */
- void
- GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
- struct GNUNET_PeerIdentity *id)
- {
- GNUNET_assert (0 != cp->ppd.pid);
- GNUNET_PEER_resolve (cp->ppd.pid, id);
- }
- /**
- * Obtain the identity of a connected peer.
- *
- * @param cp peer to get identity of
- * @return reference to peer identity, valid until peer disconnects (!)
- */
- const struct GNUNET_PeerIdentity *
- GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
- {
- GNUNET_assert (0 != cp->ppd.pid);
- return GNUNET_PEER_resolve2 (cp->ppd.pid);
- }
- /**
- * Assemble a migration stop message for transmission.
- *
- * @param cls the 'struct GSF_ConnectedPeer' to use
- * @param size number of bytes we're allowed to write to buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
- static size_t
- create_migration_stop_message (void *cls, size_t size, void *buf)
- {
- struct GSF_ConnectedPeer *cp = cls;
- struct MigrationStopMessage msm;
- cp->migration_pth = NULL;
- if (NULL == buf)
- return 0;
- GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
- msm.header.size = htons (sizeof (struct MigrationStopMessage));
- msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
- msm.reserved = htonl (0);
- msm.duration =
- GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
- (cp->last_migration_block));
- memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
- GNUNET_STATISTICS_update (GSF_stats,
- gettext_noop ("# migration stop messages sent"),
- 1, GNUNET_NO);
- return sizeof (struct MigrationStopMessage);
- }
- /**
- * Ask a peer to stop migrating data to us until the given point
- * in time.
- *
- * @param cp peer to ask
- * @param block_time until when to block
- */
- void
- GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
- struct GNUNET_TIME_Absolute block_time)
- {
- if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Migration already blocked for another %s\n",
- GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining
- (cp->last_migration_block), GNUNET_YES));
- return; /* already blocked */
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %s\n",
- GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
- GNUNET_YES));
- cp->last_migration_block = block_time;
- if (NULL != cp->migration_pth)
- GSF_peer_transmit_cancel_ (cp->migration_pth);
- cp->migration_pth =
- GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
- GNUNET_TIME_UNIT_FOREVER_REL,
- sizeof (struct MigrationStopMessage),
- &create_migration_stop_message, cp);
- }
- /**
- * Write peer-respect information to a file - flush the buffer entry!
- *
- * @param cls unused
- * @param key peer identity
- * @param value the 'struct GSF_ConnectedPeer' to flush
- * @return GNUNET_OK to continue iteration
- */
- static int
- flush_respect (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
- {
- struct GSF_ConnectedPeer *cp = value;
- struct GNUNET_PeerIdentity pid;
- if (cp->ppd.respect == cp->disk_respect)
- return GNUNET_OK; /* unchanged */
- GNUNET_assert (0 != cp->ppd.pid);
- GNUNET_PEER_resolve (cp->ppd.pid, &pid);
- GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
- sizeof (cp->ppd.respect),
- GNUNET_TIME_UNIT_FOREVER_ABS,
- GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
- return GNUNET_OK;
- }
- /**
- * Notify core about a preference we have for the given peer
- * (to allocate more resources towards it). The change will
- * be communicated the next time we reserve bandwidth with
- * core (not instantly).
- *
- * @param cp peer to reserve bandwidth from
- * @param pref preference change
- */
- void
- GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
- uint64_t pref)
- {
- cp->inc_preference += pref;
- }
- /**
- * Call this method periodically to flush respect information to disk.
- *
- * @param cls closure, not used
- * @param tc task context, not used
- */
- static void
- cron_flush_respect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- if (NULL == cp_map)
- return;
- GNUNET_CONTAINER_multipeermap_iterate (cp_map, &flush_respect, NULL);
- if (NULL == tc)
- return;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
- GNUNET_SCHEDULER_PRIORITY_HIGH,
- &cron_flush_respect, NULL);
- }
- /**
- * Initialize peer management subsystem.
- */
- void
- GSF_connected_peer_init_ ()
- {
- cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
- peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
- GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
- &cron_flush_respect, NULL);
- }
- /**
- * Iterator to free peer entries.
- *
- * @param cls closure, unused
- * @param key current key code
- * @param value value in the hash map (peer entry)
- * @return #GNUNET_YES (we should continue to iterate)
- */
- static int
- clean_peer (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
- {
- GSF_peer_disconnect_handler_ (NULL, key);
- return GNUNET_YES;
- }
- /**
- * Shutdown peer management subsystem.
- */
- void
- GSF_connected_peer_done_ ()
- {
- cron_flush_respect (NULL, NULL);
- GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_peer, NULL);
- GNUNET_CONTAINER_multipeermap_destroy (cp_map);
- cp_map = NULL;
- GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
- }
- /**
- * Iterator to remove references to LC entry.
- *
- * @param cls the 'struct GSF_LocalClient*' to look for
- * @param key current key code
- * @param value value in the hash map (peer entry)
- * @return #GNUNET_YES (we should continue to iterate)
- */
- static int
- clean_local_client (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
- {
- const struct GSF_LocalClient *lc = cls;
- struct GSF_ConnectedPeer *cp = value;
- unsigned int i;
- for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
- if (cp->ppd.last_client_replies[i] == lc)
- cp->ppd.last_client_replies[i] = NULL;
- return GNUNET_YES;
- }
- /**
- * Notification that a local client disconnected. Clean up all of our
- * references to the given handle.
- *
- * @param lc handle to the local client (henceforth invalid)
- */
- void
- GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
- {
- if (NULL == cp_map)
- return; /* already cleaned up */
- GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
- (void *) lc);
- }
- /* end of gnunet-service-fs_cp.c */
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