2 This file is part of GNUnet.
3 (C) 2009, 2010 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 3, 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 fs/gnunet-service-fs.c
23 * @brief gnunet anonymity protocol implementation
24 * @author Christian Grothoff
31 #include "gnunet_constants.h"
32 #include "gnunet_core_service.h"
33 #include "gnunet_dht_service.h"
34 #include "gnunet_datastore_service.h"
35 #include "gnunet_load_lib.h"
36 #include "gnunet_peer_lib.h"
37 #include "gnunet_protocols.h"
38 #include "gnunet_signatures.h"
39 #include "gnunet_statistics_service.h"
40 #include "gnunet_util_lib.h"
41 #include "gnunet-service-fs_indexing.h"
44 #define DEBUG_FS GNUNET_NO
47 * Should we introduce random latency in processing? Required for proper
48 * implementation of GAP, but can be disabled for performance evaluation of
49 * the basic routing algorithm.
51 * Note that with delays enabled, performance can be significantly lower
52 * (several orders of magnitude in 2-peer test runs); if you want to
53 * measure throughput of other components, set this to NO. Also, you
54 * might want to consider changing 'RETRY_PROBABILITY_INV' to 1 for
55 * a rather wasteful mode of operation (that might still get the highest
56 * throughput overall).
58 * Performance measurements (for 50 MB file, 2 peers):
60 * - Without delays: 3300 kb/s
61 * - With delays: 101 kb/s
63 #define SUPPORT_DELAYS GNUNET_NO
66 * Size for the hash map for DHT requests from the FS
67 * service. Should be about the number of concurrent
68 * DHT requests we plan to make.
70 #define FS_DHT_HT_SIZE 1024
73 * At what frequency should our datastore load decrease
74 * automatically (since if we don't use it, clearly the
75 * load must be going down).
77 #define DATASTORE_LOAD_AUTODECLINE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250)
80 * How often do we flush trust values to disk?
82 #define TRUST_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
85 * How often do we at most PUT content into the DHT?
87 #define MAX_DHT_PUT_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
90 * Inverse of the probability that we will submit the same query
91 * to the same peer again. If the same peer already got the query
92 * repeatedly recently, the probability is multiplied by the inverse
93 * of this number each time. Note that we only try about every TTL_DECREMENT/2
94 * plus MAX_CORK_DELAY (so roughly every 3.5s).
96 * Note that this factor is a key influence to performance in small
97 * networks (especially test networks of 2 peers) because if there is
98 * only a single peer with the data, this value will determine how
99 * soon we might re-try. For example, a value of 3 can result in
100 * 1.7 MB/s transfer rates for a 10 MB file when a value of 1 would
101 * give us 5 MB/s. OTOH, obviously re-trying the same peer can be
102 * rather inefficient in larger networks, hence picking 1 is in
103 * general not the best choice.
105 * Performance measurements (for 50 MB file, 2 peers, no delays):
107 * - 1: 3300 kb/s (consistently)
108 * - 3: 2046 kb/s, 754 kb/s, 3490 kb/s
109 * - 5: 759 kb/s, 968 kb/s, 1160 kb/s
111 * Note that this does NOT mean that the value should be 1 since
112 * a 2-peer network is far from representative here (and this fails
113 * to take into consideration bandwidth wasted by repeatedly
114 * sending queries to peers that don't have the content). Also,
115 * it is expected that higher values lead to more inconsistent
116 * measurements since this only affects lost messages towards the
117 * end of the download.
119 * Finally, we should probably consider changing this and making
120 * it dependent on the number of connected peers or a related
121 * metric (bad magic constants...).
123 #define RETRY_PROBABILITY_INV 1
126 * What is the maximum delay for a P2P FS message (in our interaction
127 * with core)? FS-internal delays are another story. The value is
128 * chosen based on the 32k block size. Given that peers typcially
129 * have at least 1 kb/s bandwidth, 45s waits give us a chance to
130 * transmit one message even to the lowest-bandwidth peers.
132 #define MAX_TRANSMIT_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 45)
135 * Maximum number of requests (from other peers, overall) that we're
136 * willing to have pending at any given point in time. Can be changed
137 * via the configuration file (32k is just the default).
139 static unsigned long long max_pending_requests = (32 * 1024);
143 * Information we keep for each pending reply. The
144 * actual message follows at the end of this struct.
146 struct PendingMessage;
149 * Function called upon completion of a transmission.
152 * @param pid ID of receiving peer, 0 on transmission error
154 typedef void (*TransmissionContinuation)(void * cls,
155 GNUNET_PEER_Id tpid);
159 * Information we keep for each pending message (GET/PUT). The
160 * actual message follows at the end of this struct.
162 struct PendingMessage
165 * This is a doubly-linked list of messages to the same peer.
167 struct PendingMessage *next;
170 * This is a doubly-linked list of messages to the same peer.
172 struct PendingMessage *prev;
175 * Entry in pending message list for this pending message.
177 struct PendingMessageList *pml;
180 * Function to call immediately once we have transmitted this
183 TransmissionContinuation cont;
191 * Do not transmit this pending message until this deadline.
193 struct GNUNET_TIME_Absolute delay_until;
196 * Size of the reply; actual reply message follows
197 * at the end of this struct.
202 * How important is this message for us?
210 * Information about a peer that we are connected to.
211 * We track data that is useful for determining which
212 * peers should receive our requests. We also keep
213 * a list of messages to transmit to this peer.
219 * List of the last clients for which this peer successfully
222 struct GNUNET_SERVER_Client *last_client_replies[CS2P_SUCCESS_LIST_SIZE];
225 * List of the last PIDs for which
226 * this peer successfully answered a query;
227 * We use 0 to indicate no successful reply.
229 GNUNET_PEER_Id last_p2p_replies[P2P_SUCCESS_LIST_SIZE];
232 * Average delay between sending the peer a request and
233 * getting a reply (only calculated over the requests for
234 * which we actually got a reply). Calculated
235 * as a moving average: new_delay = ((n-1)*last_delay+curr_delay) / n
237 struct GNUNET_TIME_Relative avg_delay;
240 * Point in time until which this peer does not want us to migrate content
243 struct GNUNET_TIME_Absolute migration_blocked;
246 * Time until when we blocked this peer from migrating
249 struct GNUNET_TIME_Absolute last_migration_block;
252 * Transmission times for the last MAX_QUEUE_PER_PEER
253 * requests for this peer. Used as a ring buffer, current
254 * offset is stored in 'last_request_times_off'. If the
255 * oldest entry is more recent than the 'avg_delay', we should
256 * not send any more requests right now.
258 struct GNUNET_TIME_Absolute last_request_times[MAX_QUEUE_PER_PEER];
261 * Handle for an active request for transmission to this
264 struct GNUNET_CORE_TransmitHandle *cth;
267 * Messages (replies, queries, content migration) we would like to
268 * send to this peer in the near future. Sorted by priority, head.
270 struct PendingMessage *pending_messages_head;
273 * Messages (replies, queries, content migration) we would like to
274 * send to this peer in the near future. Sorted by priority, tail.
276 struct PendingMessage *pending_messages_tail;
279 * How long does it typically take for us to transmit a message
280 * to this peer? (delay between the request being issued and
281 * the callback being invoked).
283 struct GNUNET_LOAD_Value *transmission_delay;
286 * Time when the last transmission request was issued.
288 struct GNUNET_TIME_Absolute last_transmission_request_start;
291 * ID of delay task for scheduling transmission.
293 GNUNET_SCHEDULER_TaskIdentifier delayed_transmission_request_task;
296 * Average priority of successful replies. Calculated
297 * as a moving average: new_avg = ((n-1)*last_avg+curr_prio) / n
302 * Increase in traffic preference still to be submitted
303 * to the core service for this peer.
305 uint64_t inc_preference;
308 * Trust rating for this peer
313 * Trust rating for this peer on disk.
318 * The peer's identity.
323 * Size of the linked list of 'pending_messages'.
325 unsigned int pending_requests;
328 * Which offset in "last_p2p_replies" will be updated next?
329 * (we go round-robin).
331 unsigned int last_p2p_replies_woff;
334 * Which offset in "last_client_replies" will be updated next?
335 * (we go round-robin).
337 unsigned int last_client_replies_woff;
340 * Current offset into 'last_request_times' ring buffer.
342 unsigned int last_request_times_off;
348 * Information we keep for each pending request. We should try to
349 * keep this struct as small as possible since its memory consumption
350 * is key to how many requests we can have pending at once.
352 struct PendingRequest;
356 * Doubly-linked list of requests we are performing
357 * on behalf of the same client.
359 struct ClientRequestList
363 * This is a doubly-linked list.
365 struct ClientRequestList *next;
368 * This is a doubly-linked list.
370 struct ClientRequestList *prev;
373 * Request this entry represents.
375 struct PendingRequest *req;
378 * Client list this request belongs to.
380 struct ClientList *client_list;
386 * Replies to be transmitted to the client. The actual
387 * response message is allocated after this struct.
389 struct ClientResponseMessage
392 * This is a doubly-linked list.
394 struct ClientResponseMessage *next;
397 * This is a doubly-linked list.
399 struct ClientResponseMessage *prev;
402 * Client list entry this response belongs to.
404 struct ClientList *client_list;
407 * Number of bytes in the response.
414 * Linked list of clients we are performing requests
420 * This is a linked list.
422 struct ClientList *next;
425 * ID of a client making a request, NULL if this entry is for a
428 struct GNUNET_SERVER_Client *client;
431 * Head of list of requests performed on behalf
432 * of this client right now.
434 struct ClientRequestList *rl_head;
437 * Tail of list of requests performed on behalf
438 * of this client right now.
440 struct ClientRequestList *rl_tail;
443 * Head of linked list of responses.
445 struct ClientResponseMessage *res_head;
448 * Tail of linked list of responses.
450 struct ClientResponseMessage *res_tail;
453 * Context for sending replies.
455 struct GNUNET_CONNECTION_TransmitHandle *th;
461 * Information about a peer that we have forwarded this
462 * request to already.
464 struct UsedTargetEntry
467 * What was the last time we have transmitted this request to this
470 struct GNUNET_TIME_Absolute last_request_time;
473 * How often have we transmitted this request to this peer?
475 unsigned int num_requests;
478 * PID of the target peer.
489 * Doubly-linked list of messages we are performing
490 * due to a pending request.
492 struct PendingMessageList
496 * This is a doubly-linked list of messages on behalf of the same request.
498 struct PendingMessageList *next;
501 * This is a doubly-linked list of messages on behalf of the same request.
503 struct PendingMessageList *prev;
506 * Message this entry represents.
508 struct PendingMessage *pm;
511 * Request this entry belongs to.
513 struct PendingRequest *req;
516 * Peer this message is targeted for.
518 struct ConnectedPeer *target;
524 * Information we keep for each pending request. We should try to
525 * keep this struct as small as possible since its memory consumption
526 * is key to how many requests we can have pending at once.
528 struct PendingRequest
532 * If this request was made by a client, this is our entry in the
533 * client request list; otherwise NULL.
535 struct ClientRequestList *client_request_list;
538 * Entry of peer responsible for this entry (if this request
539 * was made by a peer).
541 struct ConnectedPeer *cp;
544 * If this is a namespace query, pointer to the hash of the public
545 * key of the namespace; otherwise NULL. Pointer will be to the
546 * end of this struct (so no need to free it).
548 const GNUNET_HashCode *namespace;
551 * Bloomfilter we use to filter out replies that we don't care about
552 * (anymore). NULL as long as we are interested in all replies.
554 struct GNUNET_CONTAINER_BloomFilter *bf;
557 * Context of our GNUNET_CORE_peer_change_preference call.
559 struct GNUNET_CORE_InformationRequestContext *irc;
562 * Reference to DHT get operation for this request (or NULL).
564 struct GNUNET_DHT_GetHandle *dht_get;
567 * Hash code of all replies that we have seen so far (only valid
568 * if client is not NULL since we only track replies like this for
571 GNUNET_HashCode *replies_seen;
574 * Node in the heap representing this entry; NULL
575 * if we have no heap node.
577 struct GNUNET_CONTAINER_HeapNode *hnode;
580 * Head of list of messages being performed on behalf of this
583 struct PendingMessageList *pending_head;
586 * Tail of list of messages being performed on behalf of this
589 struct PendingMessageList *pending_tail;
592 * When did we first see this request (form this peer), or, if our
593 * client is initiating, when did we last initiate a search?
595 struct GNUNET_TIME_Absolute start_time;
598 * The query that this request is for.
600 GNUNET_HashCode query;
603 * The task responsible for transmitting queries
606 GNUNET_SCHEDULER_TaskIdentifier task;
609 * (Interned) Peer identifier that identifies a preferred target
612 GNUNET_PEER_Id target_pid;
615 * (Interned) Peer identifiers of peers that have already
616 * received our query for this content.
618 struct UsedTargetEntry *used_targets;
621 * Our entry in the queue (non-NULL while we wait for our
622 * turn to interact with the local database).
624 struct GNUNET_DATASTORE_QueueEntry *qe;
627 * Size of the 'bf' (in bytes).
632 * Desired anonymity level; only valid for requests from a local client.
634 uint32_t anonymity_level;
637 * How many entries in "used_targets" are actually valid?
639 unsigned int used_targets_off;
642 * How long is the "used_targets" array?
644 unsigned int used_targets_size;
647 * Number of results found for this request.
649 unsigned int results_found;
652 * How many entries in "replies_seen" are actually valid?
654 unsigned int replies_seen_off;
657 * How long is the "replies_seen" array?
659 unsigned int replies_seen_size;
662 * Priority with which this request was made. If one of our clients
663 * made the request, then this is the current priority that we are
664 * using when initiating the request. This value is used when
665 * we decide to reward other peers with trust for providing a reply.
670 * Priority points left for us to spend when forwarding this request
673 uint32_t remaining_priority;
676 * Number to mingle hashes for bloom-filter tests with.
681 * TTL with which we saw this request (or, if we initiated, TTL that
682 * we used for the request).
687 * Type of the content that this request is for.
689 enum GNUNET_BLOCK_Type type;
692 * Remove this request after transmission of the current response.
697 * GNUNET_YES if we should not forward this request to other peers.
702 * GNUNET_YES if we should not forward this request to other peers.
710 * Block that is ready for migration to other peers. Actual data is at the end of the block.
712 struct MigrationReadyBlock
716 * This is a doubly-linked list.
718 struct MigrationReadyBlock *next;
721 * This is a doubly-linked list.
723 struct MigrationReadyBlock *prev;
726 * Query for the block.
728 GNUNET_HashCode query;
731 * When does this block expire?
733 struct GNUNET_TIME_Absolute expiration;
736 * Peers we would consider forwarding this
737 * block to. Zero for empty entries.
739 GNUNET_PEER_Id target_list[MIGRATION_LIST_SIZE];
747 * Number of targets already used.
749 unsigned int used_targets;
754 enum GNUNET_BLOCK_Type type;
759 * Our connection to the datastore.
761 static struct GNUNET_DATASTORE_Handle *dsh;
766 static struct GNUNET_BLOCK_Context *block_ctx;
769 * Our block configuration.
771 static struct GNUNET_CONFIGURATION_Handle *block_cfg;
776 static const struct GNUNET_CONFIGURATION_Handle *cfg;
779 * Map of peer identifiers to "struct ConnectedPeer" (for that peer).
781 static struct GNUNET_CONTAINER_MultiHashMap *connected_peers;
784 * Map of peer identifiers to "struct PendingRequest" (for that peer).
786 static struct GNUNET_CONTAINER_MultiHashMap *peer_request_map;
789 * Map of query identifiers to "struct PendingRequest" (for that query).
791 static struct GNUNET_CONTAINER_MultiHashMap *query_request_map;
794 * Heap with the request that will expire next at the top. Contains
795 * pointers of type "struct PendingRequest*"; these will *also* be
796 * aliased from the "requests_by_peer" data structures and the
797 * "requests_by_query" table. Note that requests from our clients
798 * don't expire and are thus NOT in the "requests_by_expiration"
799 * (or the "requests_by_peer" tables).
801 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
804 * Handle for reporting statistics.
806 static struct GNUNET_STATISTICS_Handle *stats;
809 * Linked list of clients we are currently processing requests for.
811 static struct ClientList *client_list;
814 * Pointer to handle to the core service (points to NULL until we've
817 static struct GNUNET_CORE_Handle *core;
820 * Head of linked list of blocks that can be migrated.
822 static struct MigrationReadyBlock *mig_head;
825 * Tail of linked list of blocks that can be migrated.
827 static struct MigrationReadyBlock *mig_tail;
830 * Request to datastore for migration (or NULL).
832 static struct GNUNET_DATASTORE_QueueEntry *mig_qe;
835 * Request to datastore for DHT PUTs (or NULL).
837 static struct GNUNET_DATASTORE_QueueEntry *dht_qe;
840 * Type we will request for the next DHT PUT round from the datastore.
842 static enum GNUNET_BLOCK_Type dht_put_type = GNUNET_BLOCK_TYPE_FS_KBLOCK;
845 * Where do we store trust information?
847 static char *trustDirectory;
850 * ID of task that collects blocks for migration.
852 static GNUNET_SCHEDULER_TaskIdentifier mig_task;
855 * ID of task that collects blocks for DHT PUTs.
857 static GNUNET_SCHEDULER_TaskIdentifier dht_task;
860 * What is the maximum frequency at which we are allowed to
861 * poll the datastore for migration content?
863 static struct GNUNET_TIME_Relative min_migration_delay;
866 * Handle for DHT operations.
868 static struct GNUNET_DHT_Handle *dht_handle;
871 * Size of the doubly-linked list of migration blocks.
873 static unsigned int mig_size;
876 * Are we allowed to migrate content to this peer.
878 static int active_migration;
881 * How many entires with zero anonymity do we currently estimate
882 * to have in the database?
884 static unsigned int zero_anonymity_count_estimate;
887 * Typical priorities we're seeing from other peers right now. Since
888 * most priorities will be zero, this value is the weighted average of
889 * non-zero priorities seen "recently". In order to ensure that new
890 * values do not dramatically change the ratio, values are first
891 * "capped" to a reasonable range (+N of the current value) and then
892 * averaged into the existing value by a ratio of 1:N. Hence
893 * receiving the largest possible priority can still only raise our
894 * "current_priorities" by at most 1.
896 static double current_priorities;
899 * Datastore 'GET' load tracking.
901 static struct GNUNET_LOAD_Value *datastore_get_load;
904 * Datastore 'PUT' load tracking.
906 static struct GNUNET_LOAD_Value *datastore_put_load;
909 * How long do requests typically stay in the routing table?
911 static struct GNUNET_LOAD_Value *rt_entry_lifetime;
914 * We've just now completed a datastore request. Update our
915 * datastore load calculations.
917 * @param start time when the datastore request was issued
920 update_datastore_delays (struct GNUNET_TIME_Absolute start)
922 struct GNUNET_TIME_Relative delay;
924 delay = GNUNET_TIME_absolute_get_duration (start);
925 GNUNET_LOAD_update (datastore_get_load,
931 * Get the filename under which we would store the GNUNET_HELLO_Message
932 * for the given host and protocol.
933 * @return filename of the form DIRECTORY/HOSTID
936 get_trust_filename (const struct GNUNET_PeerIdentity *id)
938 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
941 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
942 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
949 * Transmit messages by copying it to the target buffer
950 * "buf". "buf" will be NULL and "size" zero if the socket was closed
951 * for writing in the meantime. In that case, do nothing
952 * (the disconnect or shutdown handler will take care of the rest).
953 * If we were able to transmit messages and there are still more
954 * pending, ask core again for further calls to this function.
956 * @param cls closure, pointer to the 'struct ConnectedPeer*'
957 * @param size number of bytes available in buf
958 * @param buf where the callee should write the message
959 * @return number of bytes written to buf
962 transmit_to_peer (void *cls,
963 size_t size, void *buf);
966 /* ******************* clean up functions ************************ */
969 * Delete the given migration block.
971 * @param mb block to delete
974 delete_migration_block (struct MigrationReadyBlock *mb)
976 GNUNET_CONTAINER_DLL_remove (mig_head,
979 GNUNET_PEER_decrement_rcs (mb->target_list,
980 MIGRATION_LIST_SIZE);
987 * Compare the distance of two peers to a key.
990 * @param p1 first peer
991 * @param p2 second peer
992 * @return GNUNET_YES if P1 is closer to key than P2
995 is_closer (const GNUNET_HashCode *key,
996 const struct GNUNET_PeerIdentity *p1,
997 const struct GNUNET_PeerIdentity *p2)
999 return GNUNET_CRYPTO_hash_xorcmp (&p1->hashPubKey,
1006 * Consider migrating content to a given peer.
1008 * @param cls 'struct MigrationReadyBlock*' to select
1009 * targets for (or NULL for none)
1010 * @param key ID of the peer
1011 * @param value 'struct ConnectedPeer' of the peer
1012 * @return GNUNET_YES (always continue iteration)
1015 consider_migration (void *cls,
1016 const GNUNET_HashCode *key,
1019 struct MigrationReadyBlock *mb = cls;
1020 struct ConnectedPeer *cp = value;
1021 struct MigrationReadyBlock *pos;
1022 struct GNUNET_PeerIdentity cppid;
1023 struct GNUNET_PeerIdentity otherpid;
1024 struct GNUNET_PeerIdentity worstpid;
1029 /* consider 'cp' as a migration target for mb */
1030 if (GNUNET_TIME_absolute_get_remaining (cp->migration_blocked).rel_value > 0)
1031 return GNUNET_YES; /* peer has requested no migration! */
1034 GNUNET_PEER_resolve (cp->pid,
1036 repl = MIGRATION_LIST_SIZE;
1037 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1039 if (mb->target_list[i] == 0)
1041 mb->target_list[i] = cp->pid;
1042 GNUNET_PEER_change_rc (mb->target_list[i], 1);
1043 repl = MIGRATION_LIST_SIZE;
1046 GNUNET_PEER_resolve (mb->target_list[i],
1048 if ( (repl == MIGRATION_LIST_SIZE) &&
1049 is_closer (&mb->query,
1054 worstpid = otherpid;
1056 else if ( (repl != MIGRATION_LIST_SIZE) &&
1057 (is_closer (&mb->query,
1062 worstpid = otherpid;
1065 if (repl != MIGRATION_LIST_SIZE)
1067 GNUNET_PEER_change_rc (mb->target_list[repl], -1);
1068 mb->target_list[repl] = cp->pid;
1069 GNUNET_PEER_change_rc (mb->target_list[repl], 1);
1073 /* consider scheduling transmission to cp for content migration */
1074 if (cp->cth != NULL)
1080 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1082 if (cp->pid == pos->target_list[i])
1087 msize = GNUNET_MIN (msize,
1095 return GNUNET_YES; /* no content available */
1097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1098 "Trying to migrate at least %u bytes to peer `%s'\n",
1102 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
1104 GNUNET_SCHEDULER_cancel (cp->delayed_transmission_request_task);
1105 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
1108 = GNUNET_CORE_notify_transmit_ready (core,
1109 0, GNUNET_TIME_UNIT_FOREVER_REL,
1110 (const struct GNUNET_PeerIdentity*) key,
1111 msize + sizeof (struct PutMessage),
1119 * Task that is run periodically to obtain blocks for content
1123 * @param tc scheduler context (also unused)
1126 gather_migration_blocks (void *cls,
1127 const struct GNUNET_SCHEDULER_TaskContext *tc);
1133 * Task that is run periodically to obtain blocks for DHT PUTs.
1135 * @param cls type of blocks to gather
1136 * @param tc scheduler context (unused)
1139 gather_dht_put_blocks (void *cls,
1140 const struct GNUNET_SCHEDULER_TaskContext *tc);
1144 * If the migration task is not currently running, consider
1145 * (re)scheduling it with the appropriate delay.
1148 consider_migration_gathering ()
1150 struct GNUNET_TIME_Relative delay;
1156 if (mig_task != GNUNET_SCHEDULER_NO_TASK)
1158 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
1160 delay = GNUNET_TIME_relative_divide (delay,
1161 MAX_MIGRATION_QUEUE);
1162 delay = GNUNET_TIME_relative_max (delay,
1163 min_migration_delay);
1164 mig_task = GNUNET_SCHEDULER_add_delayed (delay,
1165 &gather_migration_blocks,
1171 * If the DHT PUT gathering task is not currently running, consider
1172 * (re)scheduling it with the appropriate delay.
1175 consider_dht_put_gathering (void *cls)
1177 struct GNUNET_TIME_Relative delay;
1183 if (dht_task != GNUNET_SCHEDULER_NO_TASK)
1185 if (zero_anonymity_count_estimate > 0)
1187 delay = GNUNET_TIME_relative_divide (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
1188 zero_anonymity_count_estimate);
1189 delay = GNUNET_TIME_relative_min (delay,
1194 /* if we have NO zero-anonymity content yet, wait 5 minutes for some to
1195 (hopefully) appear */
1196 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5);
1198 dht_task = GNUNET_SCHEDULER_add_delayed (delay,
1199 &gather_dht_put_blocks,
1205 * Process content offered for migration.
1207 * @param cls closure
1208 * @param key key for the content
1209 * @param size number of bytes in data
1210 * @param data content stored
1211 * @param type type of the content
1212 * @param priority priority of the content
1213 * @param anonymity anonymity-level for the content
1214 * @param expiration expiration time for the content
1215 * @param uid unique identifier for the datum;
1216 * maybe 0 if no unique identifier is available
1219 process_migration_content (void *cls,
1220 const GNUNET_HashCode * key,
1223 enum GNUNET_BLOCK_Type type,
1226 struct GNUNET_TIME_Absolute
1227 expiration, uint64_t uid)
1229 struct MigrationReadyBlock *mb;
1234 if (mig_size < MAX_MIGRATION_QUEUE)
1235 consider_migration_gathering ();
1238 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1241 GNUNET_FS_handle_on_demand_block (key, size, data,
1242 type, priority, anonymity,
1244 &process_migration_content,
1247 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1253 "Retrieved block `%s' of type %u for migration\n",
1257 mb = GNUNET_malloc (sizeof (struct MigrationReadyBlock) + size);
1259 mb->expiration = expiration;
1262 memcpy (&mb[1], data, size);
1263 GNUNET_CONTAINER_DLL_insert_after (mig_head,
1268 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1269 &consider_migration,
1271 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1276 * Function called upon completion of the DHT PUT operation.
1279 dht_put_continuation (void *cls,
1280 const struct GNUNET_SCHEDULER_TaskContext *tc)
1282 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1287 * Store content in DHT.
1289 * @param cls closure
1290 * @param key key for the content
1291 * @param size number of bytes in data
1292 * @param data content stored
1293 * @param type type of the content
1294 * @param priority priority of the content
1295 * @param anonymity anonymity-level for the content
1296 * @param expiration expiration time for the content
1297 * @param uid unique identifier for the datum;
1298 * maybe 0 if no unique identifier is available
1301 process_dht_put_content (void *cls,
1302 const GNUNET_HashCode * key,
1305 enum GNUNET_BLOCK_Type type,
1308 struct GNUNET_TIME_Absolute
1309 expiration, uint64_t uid)
1311 static unsigned int counter;
1312 static GNUNET_HashCode last_vhash;
1313 static GNUNET_HashCode vhash;
1318 consider_dht_put_gathering (cls);
1321 /* slightly funky code to estimate the total number of values with zero
1322 anonymity from the maximum observed length of a monotonically increasing
1323 sequence of hashes over the contents */
1324 GNUNET_CRYPTO_hash (data, size, &vhash);
1325 if (GNUNET_CRYPTO_hash_cmp (&vhash, &last_vhash) <= 0)
1327 if (zero_anonymity_count_estimate > 0)
1328 zero_anonymity_count_estimate /= 2;
1334 if (zero_anonymity_count_estimate < (1 << counter))
1335 zero_anonymity_count_estimate = (1 << counter);
1337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1338 "Retrieved block `%s' of type %u for DHT PUT\n",
1342 GNUNET_DHT_put (dht_handle,
1344 DEFAULT_PUT_REPLICATION,
1350 GNUNET_TIME_UNIT_FOREVER_REL,
1351 &dht_put_continuation,
1357 * Task that is run periodically to obtain blocks for content
1361 * @param tc scheduler context (also unused)
1364 gather_migration_blocks (void *cls,
1365 const struct GNUNET_SCHEDULER_TaskContext *tc)
1367 mig_task = GNUNET_SCHEDULER_NO_TASK;
1370 mig_qe = GNUNET_DATASTORE_get_random (dsh, 0, UINT_MAX,
1371 GNUNET_TIME_UNIT_FOREVER_REL,
1372 &process_migration_content, NULL);
1373 GNUNET_assert (mig_qe != NULL);
1379 * Task that is run periodically to obtain blocks for DHT PUTs.
1381 * @param cls type of blocks to gather
1382 * @param tc scheduler context (unused)
1385 gather_dht_put_blocks (void *cls,
1386 const struct GNUNET_SCHEDULER_TaskContext *tc)
1388 dht_task = GNUNET_SCHEDULER_NO_TASK;
1391 if (dht_put_type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1392 dht_put_type = GNUNET_BLOCK_TYPE_FS_KBLOCK;
1393 dht_qe = GNUNET_DATASTORE_get_zero_anonymity (dsh, 0, UINT_MAX,
1394 GNUNET_TIME_UNIT_FOREVER_REL,
1396 &process_dht_put_content, NULL);
1397 GNUNET_assert (dht_qe != NULL);
1403 * We're done with a particular message list entry.
1404 * Free all associated resources.
1406 * @param pml entry to destroy
1409 destroy_pending_message_list_entry (struct PendingMessageList *pml)
1411 GNUNET_CONTAINER_DLL_remove (pml->req->pending_head,
1412 pml->req->pending_tail,
1414 GNUNET_CONTAINER_DLL_remove (pml->target->pending_messages_head,
1415 pml->target->pending_messages_tail,
1417 pml->target->pending_requests--;
1418 GNUNET_free (pml->pm);
1424 * Destroy the given pending message (and call the respective
1427 * @param pm message to destroy
1428 * @param tpid id of peer that the message was delivered to, or 0 for none
1431 destroy_pending_message (struct PendingMessage *pm,
1432 GNUNET_PEER_Id tpid)
1434 struct PendingMessageList *pml = pm->pml;
1435 TransmissionContinuation cont;
1439 cont_cls = pm->cont_cls;
1442 GNUNET_assert (pml->pm == pm);
1443 GNUNET_assert ( (tpid == 0) || (tpid == pml->target->pid) );
1444 destroy_pending_message_list_entry (pml);
1451 cont (cont_cls, tpid);
1456 * We're done processing a particular request.
1457 * Free all associated resources.
1459 * @param pr request to destroy
1462 destroy_pending_request (struct PendingRequest *pr)
1464 struct GNUNET_PeerIdentity pid;
1467 if (pr->hnode != NULL)
1469 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration_heap,
1473 if (NULL == pr->client_request_list)
1475 GNUNET_STATISTICS_update (stats,
1476 gettext_noop ("# P2P searches active"),
1482 GNUNET_STATISTICS_update (stats,
1483 gettext_noop ("# client searches active"),
1488 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
1492 GNUNET_LOAD_update (rt_entry_lifetime,
1493 GNUNET_TIME_absolute_get_duration (pr->start_time).rel_value);
1497 GNUNET_DATASTORE_cancel (pr->qe);
1500 if (pr->dht_get != NULL)
1502 GNUNET_DHT_get_stop (pr->dht_get);
1505 if (pr->client_request_list != NULL)
1507 GNUNET_CONTAINER_DLL_remove (pr->client_request_list->client_list->rl_head,
1508 pr->client_request_list->client_list->rl_tail,
1509 pr->client_request_list);
1510 GNUNET_free (pr->client_request_list);
1511 pr->client_request_list = NULL;
1515 GNUNET_PEER_resolve (pr->cp->pid,
1517 (void) GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1524 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1527 if (pr->irc != NULL)
1529 GNUNET_CORE_peer_change_preference_cancel (pr->irc);
1532 if (pr->replies_seen != NULL)
1534 GNUNET_free (pr->replies_seen);
1535 pr->replies_seen = NULL;
1537 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
1539 GNUNET_SCHEDULER_cancel (pr->task);
1540 pr->task = GNUNET_SCHEDULER_NO_TASK;
1542 while (NULL != pr->pending_head)
1543 destroy_pending_message_list_entry (pr->pending_head);
1544 GNUNET_PEER_change_rc (pr->target_pid, -1);
1545 if (pr->used_targets != NULL)
1547 for (i=0;i<pr->used_targets_off;i++)
1548 GNUNET_PEER_change_rc (pr->used_targets[i].pid, -1);
1549 GNUNET_free (pr->used_targets);
1550 pr->used_targets_off = 0;
1551 pr->used_targets_size = 0;
1552 pr->used_targets = NULL;
1559 * Method called whenever a given peer connects.
1561 * @param cls closure, not used
1562 * @param peer peer identity this notification is about
1563 * @param latency reported latency of the connection with 'other'
1564 * @param distance reported distance (DV) to 'other'
1567 peer_connect_handler (void *cls,
1569 GNUNET_PeerIdentity * peer,
1570 struct GNUNET_TIME_Relative latency,
1573 struct ConnectedPeer *cp;
1574 struct MigrationReadyBlock *pos;
1578 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1585 cp = GNUNET_malloc (sizeof (struct ConnectedPeer));
1586 cp->transmission_delay = GNUNET_LOAD_value_init (latency);
1587 cp->pid = GNUNET_PEER_intern (peer);
1589 fn = get_trust_filename (peer);
1590 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
1591 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
1592 cp->disk_trust = cp->trust = ntohl (trust);
1595 GNUNET_break (GNUNET_OK ==
1596 GNUNET_CONTAINER_multihashmap_put (connected_peers,
1599 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1604 (void) consider_migration (pos, &peer->hashPubKey, cp);
1611 * Method called whenever a given peer has a status change.
1613 * @param cls closure
1614 * @param peer peer identity this notification is about
1615 * @param latency reported latency of the connection with 'other'
1616 * @param distance reported distance (DV) to 'other'
1617 * @param bandwidth_in available amount of inbound bandwidth
1618 * @param bandwidth_out available amount of outbound bandwidth
1619 * @param timeout absolute time when this peer will time out
1620 * unless we see some further activity from it
1623 peer_status_handler (void *cls,
1625 GNUNET_PeerIdentity * peer,
1626 struct GNUNET_TIME_Relative latency,
1628 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1629 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1630 struct GNUNET_TIME_Absolute timeout)
1632 struct ConnectedPeer *cp;
1634 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1641 GNUNET_LOAD_value_set_decline (cp->transmission_delay,
1648 * Increase the host credit by a value.
1650 * @param host which peer to change the trust value on
1651 * @param value is the int value by which the
1652 * host credit is to be increased or decreased
1653 * @returns the actual change in trust (positive or negative)
1656 change_host_trust (struct ConnectedPeer *host, int value)
1660 GNUNET_assert (host != NULL);
1663 if (host->trust + value < host->trust)
1665 value = UINT32_MAX - host->trust;
1666 host->trust = UINT32_MAX;
1669 host->trust += value;
1673 if (host->trust < -value)
1675 value = -host->trust;
1679 host->trust += value;
1686 * Write host-trust information to a file - flush the buffer entry!
1689 flush_trust (void *cls,
1690 const GNUNET_HashCode *key,
1693 struct ConnectedPeer *host = value;
1696 struct GNUNET_PeerIdentity pid;
1698 if (host->trust == host->disk_trust)
1699 return GNUNET_OK; /* unchanged */
1700 GNUNET_PEER_resolve (host->pid,
1702 fn = get_trust_filename (&pid);
1703 if (host->trust == 0)
1705 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1706 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1707 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1711 trust = htonl (host->trust);
1712 if (sizeof(uint32_t) == GNUNET_DISK_fn_write (fn, &trust,
1714 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
1715 | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
1716 host->disk_trust = host->trust;
1723 * Call this method periodically to scan data/hosts for new hosts.
1726 cron_flush_trust (void *cls,
1727 const struct GNUNET_SCHEDULER_TaskContext *tc)
1730 if (NULL == connected_peers)
1732 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1737 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1739 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1744 * Free (each) request made by the peer.
1746 * @param cls closure, points to peer that the request belongs to
1747 * @param key current key code
1748 * @param value value in the hash map
1749 * @return GNUNET_YES (we should continue to iterate)
1752 destroy_request (void *cls,
1753 const GNUNET_HashCode * key,
1756 const struct GNUNET_PeerIdentity * peer = cls;
1757 struct PendingRequest *pr = value;
1759 GNUNET_break (GNUNET_YES ==
1760 GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1763 destroy_pending_request (pr);
1769 * Method called whenever a peer disconnects.
1771 * @param cls closure, not used
1772 * @param peer peer identity this notification is about
1775 peer_disconnect_handler (void *cls,
1777 GNUNET_PeerIdentity * peer)
1779 struct ConnectedPeer *cp;
1780 struct PendingMessage *pm;
1782 struct MigrationReadyBlock *pos;
1783 struct MigrationReadyBlock *next;
1785 GNUNET_CONTAINER_multihashmap_get_multiple (peer_request_map,
1789 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1793 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1795 if (NULL != cp->last_client_replies[i])
1797 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1798 cp->last_client_replies[i] = NULL;
1801 GNUNET_break (GNUNET_YES ==
1802 GNUNET_CONTAINER_multihashmap_remove (connected_peers,
1805 /* remove this peer from migration considerations; schedule
1808 while (NULL != (pos = next))
1811 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1813 if (pos->target_list[i] == cp->pid)
1815 GNUNET_PEER_change_rc (pos->target_list[i], -1);
1816 pos->target_list[i] = 0;
1819 if (pos->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers))
1821 delete_migration_block (pos);
1822 consider_migration_gathering ();
1825 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1826 &consider_migration,
1829 GNUNET_PEER_change_rc (cp->pid, -1);
1830 GNUNET_PEER_decrement_rcs (cp->last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1831 if (NULL != cp->cth)
1833 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1836 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
1838 GNUNET_SCHEDULER_cancel (cp->delayed_transmission_request_task);
1839 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
1841 while (NULL != (pm = cp->pending_messages_head))
1842 destroy_pending_message (pm, 0 /* delivery failed */);
1843 GNUNET_LOAD_value_free (cp->transmission_delay);
1844 GNUNET_break (0 == cp->pending_requests);
1850 * Iterator over hash map entries that removes all occurences
1851 * of the given 'client' from the 'last_client_replies' of the
1852 * given connected peer.
1854 * @param cls closure, the 'struct GNUNET_SERVER_Client*' to remove
1855 * @param key current key code (unused)
1856 * @param value value in the hash map (the 'struct ConnectedPeer*' to change)
1857 * @return GNUNET_YES (we should continue to iterate)
1860 remove_client_from_last_client_replies (void *cls,
1861 const GNUNET_HashCode * key,
1864 struct GNUNET_SERVER_Client *client = cls;
1865 struct ConnectedPeer *cp = value;
1868 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1870 if (cp->last_client_replies[i] == client)
1872 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1873 cp->last_client_replies[i] = NULL;
1881 * A client disconnected. Remove all of its pending queries.
1883 * @param cls closure, NULL
1884 * @param client identification of the client
1887 handle_client_disconnect (void *cls,
1888 struct GNUNET_SERVER_Client
1891 struct ClientList *pos;
1892 struct ClientList *prev;
1893 struct ClientRequestList *rcl;
1894 struct ClientResponseMessage *creply;
1900 while ( (NULL != pos) &&
1901 (pos->client != client) )
1907 return; /* no requests pending for this client */
1908 while (NULL != (rcl = pos->rl_head))
1910 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1911 "Destroying pending request `%s' on disconnect\n",
1912 GNUNET_h2s (&rcl->req->query));
1913 destroy_pending_request (rcl->req);
1916 client_list = pos->next;
1918 prev->next = pos->next;
1919 if (pos->th != NULL)
1921 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
1924 while (NULL != (creply = pos->res_head))
1926 GNUNET_CONTAINER_DLL_remove (pos->res_head,
1929 GNUNET_free (creply);
1931 GNUNET_SERVER_client_drop (pos->client);
1933 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1934 &remove_client_from_last_client_replies,
1940 * Iterator to free peer entries.
1942 * @param cls closure, unused
1943 * @param key current key code
1944 * @param value value in the hash map (peer entry)
1945 * @return GNUNET_YES (we should continue to iterate)
1948 clean_peer (void *cls,
1949 const GNUNET_HashCode * key,
1952 peer_disconnect_handler (NULL, (const struct GNUNET_PeerIdentity*) key);
1958 * Task run during shutdown.
1964 shutdown_task (void *cls,
1965 const struct GNUNET_SCHEDULER_TaskContext *tc)
1969 GNUNET_DATASTORE_cancel (mig_qe);
1974 GNUNET_DATASTORE_cancel (dht_qe);
1977 if (GNUNET_SCHEDULER_NO_TASK != mig_task)
1979 GNUNET_SCHEDULER_cancel (mig_task);
1980 mig_task = GNUNET_SCHEDULER_NO_TASK;
1982 if (GNUNET_SCHEDULER_NO_TASK != dht_task)
1984 GNUNET_SCHEDULER_cancel (dht_task);
1985 dht_task = GNUNET_SCHEDULER_NO_TASK;
1987 while (client_list != NULL)
1988 handle_client_disconnect (NULL,
1989 client_list->client);
1990 cron_flush_trust (NULL, NULL);
1991 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1994 GNUNET_break (0 == GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap));
1995 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1996 requests_by_expiration_heap = 0;
1997 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
1998 connected_peers = NULL;
1999 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (query_request_map));
2000 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
2001 query_request_map = NULL;
2002 GNUNET_LOAD_value_free (rt_entry_lifetime);
2003 rt_entry_lifetime = NULL;
2004 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (peer_request_map));
2005 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
2006 peer_request_map = NULL;
2007 GNUNET_assert (NULL != core);
2008 GNUNET_CORE_disconnect (core);
2012 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
2017 GNUNET_DATASTORE_disconnect (dsh,
2021 while (mig_head != NULL)
2022 delete_migration_block (mig_head);
2023 GNUNET_assert (0 == mig_size);
2024 GNUNET_DHT_disconnect (dht_handle);
2026 GNUNET_LOAD_value_free (datastore_get_load);
2027 datastore_get_load = NULL;
2028 GNUNET_LOAD_value_free (datastore_put_load);
2029 datastore_put_load = NULL;
2030 GNUNET_BLOCK_context_destroy (block_ctx);
2032 GNUNET_CONFIGURATION_destroy (block_cfg);
2035 GNUNET_free_non_null (trustDirectory);
2036 trustDirectory = NULL;
2040 /* ******************* Utility functions ******************** */
2044 * We've had to delay a request for transmission to core, but now
2045 * we should be ready. Run it.
2047 * @param cls the 'struct ConnectedPeer' for which a request was delayed
2048 * @param tc task context (unused)
2051 delayed_transmission_request (void *cls,
2052 const struct GNUNET_SCHEDULER_TaskContext *tc)
2054 struct ConnectedPeer *cp = cls;
2055 struct GNUNET_PeerIdentity pid;
2056 struct PendingMessage *pm;
2058 pm = cp->pending_messages_head;
2059 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
2060 GNUNET_assert (cp->cth == NULL);
2063 GNUNET_PEER_resolve (cp->pid,
2065 cp->last_transmission_request_start = GNUNET_TIME_absolute_get ();
2066 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
2068 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2077 * Transmit messages by copying it to the target buffer
2078 * "buf". "buf" will be NULL and "size" zero if the socket was closed
2079 * for writing in the meantime. In that case, do nothing
2080 * (the disconnect or shutdown handler will take care of the rest).
2081 * If we were able to transmit messages and there are still more
2082 * pending, ask core again for further calls to this function.
2084 * @param cls closure, pointer to the 'struct ConnectedPeer*'
2085 * @param size number of bytes available in buf
2086 * @param buf where the callee should write the message
2087 * @return number of bytes written to buf
2090 transmit_to_peer (void *cls,
2091 size_t size, void *buf)
2093 struct ConnectedPeer *cp = cls;
2095 struct PendingMessage *pm;
2096 struct PendingMessage *next_pm;
2097 struct GNUNET_TIME_Absolute now;
2098 struct GNUNET_TIME_Relative min_delay;
2099 struct MigrationReadyBlock *mb;
2100 struct MigrationReadyBlock *next;
2101 struct PutMessage migm;
2104 struct GNUNET_PeerIdentity pid;
2110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2111 "Dropping message, core too busy.\n");
2113 GNUNET_LOAD_update (cp->transmission_delay,
2117 GNUNET_LOAD_update (cp->transmission_delay,
2118 GNUNET_TIME_absolute_get_duration (cp->last_transmission_request_start).rel_value);
2119 now = GNUNET_TIME_absolute_get ();
2121 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
2122 next_pm = cp->pending_messages_head;
2123 while ( (NULL != (pm = next_pm) ) &&
2124 (pm->msize <= size) )
2127 if (pm->delay_until.abs_value > now.abs_value)
2129 min_delay = GNUNET_TIME_relative_min (min_delay,
2130 GNUNET_TIME_absolute_get_remaining (pm->delay_until));
2133 memcpy (&cbuf[msize], &pm[1], pm->msize);
2136 if (NULL == pm->pml)
2138 GNUNET_CONTAINER_DLL_remove (cp->pending_messages_head,
2139 cp->pending_messages_tail,
2141 cp->pending_requests--;
2143 destroy_pending_message (pm, cp->pid);
2146 min_delay = GNUNET_TIME_UNIT_ZERO;
2147 if (NULL != cp->pending_messages_head)
2149 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == cp->delayed_transmission_request_task);
2150 cp->delayed_transmission_request_task
2151 = GNUNET_SCHEDULER_add_delayed (min_delay,
2152 &delayed_transmission_request,
2157 GNUNET_PEER_resolve (cp->pid,
2160 while (NULL != (mb = next))
2163 for (i=0;i<MIGRATION_LIST_SIZE;i++)
2165 if ( (cp->pid == mb->target_list[i]) &&
2166 (mb->size + sizeof (migm) <= size) )
2168 GNUNET_PEER_change_rc (mb->target_list[i], -1);
2169 mb->target_list[i] = 0;
2171 memset (&migm, 0, sizeof (migm));
2172 migm.header.size = htons (sizeof (migm) + mb->size);
2173 migm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2174 migm.type = htonl (mb->type);
2175 migm.expiration = GNUNET_TIME_absolute_hton (mb->expiration);
2176 memcpy (&cbuf[msize], &migm, sizeof (migm));
2177 msize += sizeof (migm);
2178 size -= sizeof (migm);
2179 memcpy (&cbuf[msize], &mb[1], mb->size);
2183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2184 "Pushing migration block `%s' (%u bytes) to `%s'\n",
2185 GNUNET_h2s (&mb->query),
2186 (unsigned int) mb->size,
2194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2195 "Migration block `%s' (%u bytes) is not on migration list for peer `%s'\n",
2196 GNUNET_h2s (&mb->query),
2197 (unsigned int) mb->size,
2202 if ( (mb->used_targets >= MIGRATION_TARGET_COUNT) ||
2203 (mb->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers)) )
2205 delete_migration_block (mb);
2206 consider_migration_gathering ();
2209 consider_migration (NULL,
2214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2215 "Transmitting %u bytes to peer with PID %u\n",
2216 (unsigned int) msize,
2217 (unsigned int) cp->pid);
2224 * Add a message to the set of pending messages for the given peer.
2226 * @param cp peer to send message to
2227 * @param pm message to queue
2228 * @param pr request on which behalf this message is being queued
2231 add_to_pending_messages_for_peer (struct ConnectedPeer *cp,
2232 struct PendingMessage *pm,
2233 struct PendingRequest *pr)
2235 struct PendingMessage *pos;
2236 struct PendingMessageList *pml;
2237 struct GNUNET_PeerIdentity pid;
2239 GNUNET_assert (pm->next == NULL);
2240 GNUNET_assert (pm->pml == NULL);
2243 pml = GNUNET_malloc (sizeof (struct PendingMessageList));
2248 GNUNET_CONTAINER_DLL_insert (pr->pending_head,
2252 pos = cp->pending_messages_head;
2253 while ( (pos != NULL) &&
2254 (pm->priority < pos->priority) )
2256 GNUNET_CONTAINER_DLL_insert_after (cp->pending_messages_head,
2257 cp->pending_messages_tail,
2260 cp->pending_requests++;
2261 if (cp->pending_requests > MAX_QUEUE_PER_PEER)
2263 GNUNET_STATISTICS_update (stats,
2264 gettext_noop ("# P2P searches discarded (queue length bound)"),
2267 destroy_pending_message (cp->pending_messages_tail, 0);
2269 GNUNET_PEER_resolve (cp->pid, &pid);
2270 if (NULL != cp->cth)
2272 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
2275 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
2277 GNUNET_SCHEDULER_cancel (cp->delayed_transmission_request_task);
2278 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
2280 /* need to schedule transmission */
2281 cp->last_transmission_request_start = GNUNET_TIME_absolute_get ();
2282 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
2283 cp->pending_messages_head->priority,
2286 cp->pending_messages_head->msize,
2289 if (cp->cth == NULL)
2292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2293 "Failed to schedule transmission with core!\n");
2295 GNUNET_STATISTICS_update (stats,
2296 gettext_noop ("# CORE transmission failures"),
2304 * Test if the DATABASE (GET) load on this peer is too high
2305 * to even consider processing the query at
2308 * @return GNUNET_YES if the load is too high to do anything (load high)
2309 * GNUNET_NO to process normally (load normal)
2310 * GNUNET_SYSERR to process for free (load low)
2313 test_get_load_too_high (uint32_t priority)
2317 ld = GNUNET_LOAD_get_load (datastore_get_load);
2319 return GNUNET_SYSERR;
2329 * Test if the DATABASE (PUT) load on this peer is too high
2330 * to even consider processing the query at
2333 * @return GNUNET_YES if the load is too high to do anything (load high)
2334 * GNUNET_NO to process normally (load normal or low)
2337 test_put_load_too_high (uint32_t priority)
2341 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
2342 return GNUNET_NO; /* very fast */
2343 ld = GNUNET_LOAD_get_load (datastore_put_load);
2344 if (ld < 2.0 * (1 + priority))
2346 GNUNET_STATISTICS_update (stats,
2347 gettext_noop ("# storage requests dropped due to high load"),
2354 /* ******************* Pending Request Refresh Task ******************** */
2359 * We use a random delay to make the timing of requests less
2360 * predictable. This function returns such a random delay. We add a base
2361 * delay of MAX_CORK_DELAY (1s).
2363 * FIXME: make schedule dependent on the specifics of the request?
2364 * Or bandwidth and number of connected peers and load?
2366 * @return random delay to use for some request, between 1s and 1000+TTL_DECREMENT ms
2368 static struct GNUNET_TIME_Relative
2369 get_processing_delay ()
2372 GNUNET_TIME_relative_add (GNUNET_CONSTANTS_MAX_CORK_DELAY,
2373 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2374 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2380 * We're processing a GET request from another peer and have decided
2381 * to forward it to other peers. This function is called periodically
2382 * and should forward the request to other peers until we have all
2383 * possible replies. If we have transmitted the *only* reply to
2384 * the initiator we should destroy the pending request. If we have
2385 * many replies in the queue to the initiator, we should delay sending
2386 * out more queries until the reply queue has shrunk some.
2388 * @param cls our "struct ProcessGetContext *"
2392 forward_request_task (void *cls,
2393 const struct GNUNET_SCHEDULER_TaskContext *tc);
2397 * Function called after we either failed or succeeded
2398 * at transmitting a query to a peer.
2400 * @param cls the requests "struct PendingRequest*"
2401 * @param tpid ID of receiving peer, 0 on transmission error
2404 transmit_query_continuation (void *cls,
2405 GNUNET_PEER_Id tpid)
2407 struct PendingRequest *pr = cls;
2410 GNUNET_STATISTICS_update (stats,
2411 gettext_noop ("# queries scheduled for forwarding"),
2417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2418 "Transmission of request failed, will try again later.\n");
2420 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2421 pr->task = GNUNET_SCHEDULER_add_delayed (get_processing_delay (),
2422 &forward_request_task,
2427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2428 "Transmitted query `%s'\n",
2429 GNUNET_h2s (&pr->query));
2431 GNUNET_STATISTICS_update (stats,
2432 gettext_noop ("# queries forwarded"),
2435 for (i=0;i<pr->used_targets_off;i++)
2436 if (pr->used_targets[i].pid == tpid)
2437 break; /* found match! */
2438 if (i == pr->used_targets_off)
2440 /* need to create new entry */
2441 if (pr->used_targets_off == pr->used_targets_size)
2442 GNUNET_array_grow (pr->used_targets,
2443 pr->used_targets_size,
2444 pr->used_targets_size * 2 + 2);
2445 GNUNET_PEER_change_rc (tpid, 1);
2446 pr->used_targets[pr->used_targets_off].pid = tpid;
2447 pr->used_targets[pr->used_targets_off].num_requests = 0;
2448 i = pr->used_targets_off++;
2450 pr->used_targets[i].last_request_time = GNUNET_TIME_absolute_get ();
2451 pr->used_targets[i].num_requests++;
2452 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2453 pr->task = GNUNET_SCHEDULER_add_delayed (get_processing_delay (),
2454 &forward_request_task,
2460 * How many bytes should a bloomfilter be if we have already seen
2461 * entry_count responses? Note that BLOOMFILTER_K gives us the number
2462 * of bits set per entry. Furthermore, we should not re-size the
2463 * filter too often (to keep it cheap).
2465 * Since other peers will also add entries but not resize the filter,
2466 * we should generally pick a slightly larger size than what the
2467 * strict math would suggest.
2469 * @return must be a power of two and smaller or equal to 2^15.
2472 compute_bloomfilter_size (unsigned int entry_count)
2475 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
2476 uint16_t max = 1 << 15;
2478 if (entry_count > max)
2481 while ((size < max) && (size < ideal))
2490 * Recalculate our bloom filter for filtering replies. This function
2491 * will create a new bloom filter from scratch, so it should only be
2492 * called if we have no bloomfilter at all (and hence can create a
2493 * fresh one of minimal size without problems) OR if our peer is the
2494 * initiator (in which case we may resize to larger than mimimum size).
2496 * @param pr request for which the BF is to be recomputed
2499 refresh_bloomfilter (struct PendingRequest *pr)
2503 GNUNET_HashCode mhash;
2505 nsize = compute_bloomfilter_size (pr->replies_seen_off);
2506 if (nsize == pr->bf_size)
2507 return; /* size not changed */
2509 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
2510 pr->bf_size = nsize;
2511 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1);
2512 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
2515 for (i=0;i<pr->replies_seen_off;i++)
2517 GNUNET_BLOCK_mingle_hash (&pr->replies_seen[i],
2520 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
2526 * Function called after we've tried to reserve a certain amount of
2527 * bandwidth for a reply. Check if we succeeded and if so send our
2530 * @param cls the requests "struct PendingRequest*"
2531 * @param peer identifies the peer
2532 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
2533 * @param bpm_out set to the current bandwidth limit (sending) for this peer
2534 * @param amount set to the amount that was actually reserved or unreserved
2535 * @param preference current traffic preference for the given peer
2538 target_reservation_cb (void *cls,
2540 GNUNET_PeerIdentity * peer,
2541 struct GNUNET_BANDWIDTH_Value32NBO bpm_in,
2542 struct GNUNET_BANDWIDTH_Value32NBO bpm_out,
2544 uint64_t preference)
2546 struct PendingRequest *pr = cls;
2547 struct ConnectedPeer *cp;
2548 struct PendingMessage *pm;
2549 struct GetMessage *gm;
2550 GNUNET_HashCode *ext;
2561 /* error in communication with core, try again later */
2562 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2563 pr->task = GNUNET_SCHEDULER_add_delayed (get_processing_delay (),
2564 &forward_request_task,
2568 /* (3) transmit, update ttl/priority */
2569 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2573 /* Peer must have just left */
2575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2576 "Selected peer disconnected!\n");
2578 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2579 pr->task = GNUNET_SCHEDULER_add_delayed (get_processing_delay (),
2580 &forward_request_task,
2584 no_route = GNUNET_NO;
2590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2591 "Failed to reserve bandwidth for reply (got %d/%u bytes only)!\n",
2595 GNUNET_STATISTICS_update (stats,
2596 gettext_noop ("# reply bandwidth reservation requests failed"),
2599 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2600 pr->task = GNUNET_SCHEDULER_add_delayed (get_processing_delay (),
2601 &forward_request_task,
2603 return; /* this target round failed */
2605 no_route = GNUNET_YES;
2608 GNUNET_STATISTICS_update (stats,
2609 gettext_noop ("# queries scheduled for forwarding"),
2612 for (i=0;i<pr->used_targets_off;i++)
2613 if (pr->used_targets[i].pid == cp->pid)
2615 GNUNET_STATISTICS_update (stats,
2616 gettext_noop ("# queries retransmitted to same target"),
2622 /* build message and insert message into priority queue */
2624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2625 "Forwarding request `%s' to `%4s'!\n",
2626 GNUNET_h2s (&pr->query),
2631 if (GNUNET_YES == no_route)
2633 bm |= GET_MESSAGE_BIT_RETURN_TO;
2636 if (pr->namespace != NULL)
2638 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
2641 if (pr->target_pid != 0)
2643 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
2646 msize = sizeof (struct GetMessage) + pr->bf_size + k * sizeof(GNUNET_HashCode);
2647 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2648 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
2650 gm = (struct GetMessage*) &pm[1];
2651 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
2652 gm->header.size = htons (msize);
2653 gm->type = htonl (pr->type);
2654 pr->remaining_priority /= 2;
2655 gm->priority = htonl (pr->remaining_priority);
2656 gm->ttl = htonl (pr->ttl);
2657 gm->filter_mutator = htonl(pr->mingle);
2658 gm->hash_bitmap = htonl (bm);
2659 gm->query = pr->query;
2660 ext = (GNUNET_HashCode*) &gm[1];
2662 if (GNUNET_YES == no_route)
2663 GNUNET_PEER_resolve (pr->cp->pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
2664 if (pr->namespace != NULL)
2665 memcpy (&ext[k++], pr->namespace, sizeof (GNUNET_HashCode));
2666 if (pr->target_pid != 0)
2667 GNUNET_PEER_resolve (pr->target_pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
2668 bfdata = (char *) &ext[k];
2670 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
2673 pm->cont = &transmit_query_continuation;
2675 cp->last_request_times[(cp->last_request_times_off++) % MAX_QUEUE_PER_PEER] = GNUNET_TIME_absolute_get ();
2676 add_to_pending_messages_for_peer (cp, pm, pr);
2681 * Closure used for "target_peer_select_cb".
2683 struct PeerSelectionContext
2686 * The request for which we are selecting
2689 struct PendingRequest *pr;
2692 * Current "prime" target.
2694 struct GNUNET_PeerIdentity target;
2697 * How much do we like this target?
2699 double target_score;
2705 * Function called for each connected peer to determine
2706 * which one(s) would make good targets for forwarding.
2708 * @param cls closure (struct PeerSelectionContext)
2709 * @param key current key code (peer identity)
2710 * @param value value in the hash map (struct ConnectedPeer)
2711 * @return GNUNET_YES if we should continue to
2716 target_peer_select_cb (void *cls,
2717 const GNUNET_HashCode * key,
2720 struct PeerSelectionContext *psc = cls;
2721 struct ConnectedPeer *cp = value;
2722 struct PendingRequest *pr = psc->pr;
2723 struct GNUNET_TIME_Relative delay;
2728 /* 1) check that this peer is not the initiator */
2732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2733 "Skipping initiator in forwarding selection\n");
2735 return GNUNET_YES; /* skip */
2738 /* 2) check if we have already (recently) forwarded to this peer */
2739 /* 2a) this particular request */
2741 for (i=0;i<pr->used_targets_off;i++)
2742 if (pr->used_targets[i].pid == cp->pid)
2744 pc = pr->used_targets[i].num_requests;
2745 GNUNET_assert (pc > 0);
2746 if (0 != GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2747 RETRY_PROBABILITY_INV * pc))
2750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2751 "NOT re-trying query that was previously transmitted %u times\n",
2754 return GNUNET_YES; /* skip */
2761 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2762 "Re-trying query that was previously transmitted %u times to this peer\n",
2766 /* 2b) many other requests to this peer */
2767 delay = GNUNET_TIME_absolute_get_duration (cp->last_request_times[cp->last_request_times_off % MAX_QUEUE_PER_PEER]);
2768 if (delay.rel_value <= cp->avg_delay.rel_value)
2771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2772 "NOT sending query since we send %u others to this peer in the last %llums\n",
2774 cp->avg_delay.rel_value);
2776 return GNUNET_YES; /* skip */
2779 /* 3) calculate how much we'd like to forward to this peer,
2780 starting with a random value that is strong enough
2781 to at least give any peer a chance sometimes
2782 (compared to the other factors that come later) */
2783 /* 3a) count successful (recent) routes from cp for same source */
2786 score = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2787 P2P_SUCCESS_LIST_SIZE);
2788 for (i=0;i<P2P_SUCCESS_LIST_SIZE;i++)
2789 if (cp->last_p2p_replies[i] == pr->cp->pid)
2790 score += 1.0; /* likely successful based on hot path */
2794 score = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2795 CS2P_SUCCESS_LIST_SIZE);
2796 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
2797 if (cp->last_client_replies[i] == pr->client_request_list->client_list->client)
2798 score += 1.0; /* likely successful based on hot path */
2800 /* 3b) include latency */
2801 if (cp->avg_delay.rel_value < 4 * TTL_DECREMENT)
2802 score += 1.0; /* likely fast based on latency */
2803 /* 3c) include priorities */
2804 if (cp->avg_priority <= pr->remaining_priority / 2.0)
2805 score += 1.0; /* likely successful based on priorities */
2806 /* 3d) penalize for queue size */
2807 score -= (2.0 * cp->pending_requests / (double) MAX_QUEUE_PER_PEER);
2808 /* 3e) include peer proximity */
2809 score -= (2.0 * (GNUNET_CRYPTO_hash_distance_u32 (key,
2810 &pr->query)) / (double) UINT32_MAX);
2811 /* 4) super-bonus for being the known target */
2812 if (pr->target_pid == cp->pid)
2814 /* store best-fit in closure */
2816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2817 "Peer `%s' gets score %f for forwarding query, max is %f\n",
2822 score++; /* avoid zero */
2823 if (score > psc->target_score)
2825 psc->target_score = score;
2826 psc->target.hashPubKey = *key;
2833 * The priority level imposes a bound on the maximum
2834 * value for the ttl that can be requested.
2836 * @param ttl_in requested ttl
2837 * @param prio given priority
2838 * @return ttl_in if ttl_in is below the limit,
2839 * otherwise the ttl-limit for the given priority
2842 bound_ttl (int32_t ttl_in, uint32_t prio)
2844 unsigned long long allowed;
2848 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
2849 if (ttl_in > allowed)
2851 if (allowed >= (1 << 30))
2860 * Iterator called on each result obtained for a DHT
2861 * operation that expects a reply
2863 * @param cls closure
2864 * @param exp when will this value expire
2865 * @param key key of the result
2866 * @param get_path NULL-terminated array of pointers
2867 * to the peers on reverse GET path (or NULL if not recorded)
2868 * @param put_path NULL-terminated array of pointers
2869 * to the peers on the PUT path (or NULL if not recorded)
2870 * @param type type of the result
2871 * @param size number of bytes in data
2872 * @param data pointer to the result data
2875 process_dht_reply (void *cls,
2876 struct GNUNET_TIME_Absolute exp,
2877 const GNUNET_HashCode * key,
2878 const struct GNUNET_PeerIdentity * const *get_path,
2879 const struct GNUNET_PeerIdentity * const *put_path,
2880 enum GNUNET_BLOCK_Type type,
2886 * We're processing a GET request and have decided
2887 * to forward it to other peers. This function is called periodically
2888 * and should forward the request to other peers until we have all
2889 * possible replies. If we have transmitted the *only* reply to
2890 * the initiator we should destroy the pending request. If we have
2891 * many replies in the queue to the initiator, we should delay sending
2892 * out more queries until the reply queue has shrunk some.
2894 * @param cls our "struct ProcessGetContext *"
2898 forward_request_task (void *cls,
2899 const struct GNUNET_SCHEDULER_TaskContext *tc)
2901 struct PendingRequest *pr = cls;
2902 struct PeerSelectionContext psc;
2903 struct ConnectedPeer *cp;
2904 struct GNUNET_TIME_Relative delay;
2906 pr->task = GNUNET_SCHEDULER_NO_TASK;
2907 if (pr->irc != NULL)
2910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2911 "Forwarding of query `%s' not attempted due to pending local lookup!\n",
2912 GNUNET_h2s (&pr->query));
2914 return; /* already pending */
2916 if (GNUNET_YES == pr->local_only)
2917 return; /* configured to not do P2P search */
2919 if ( (0 == pr->anonymity_level) &&
2920 (GNUNET_YES != pr->forward_only) &&
2921 (pr->type != GNUNET_BLOCK_TYPE_FS_DBLOCK) &&
2922 (pr->type != GNUNET_BLOCK_TYPE_FS_IBLOCK) )
2924 pr->dht_get = GNUNET_DHT_get_start (dht_handle,
2925 GNUNET_TIME_UNIT_FOREVER_REL,
2928 DEFAULT_GET_REPLICATION,
2933 (pr->namespace != NULL) ? sizeof (GNUNET_HashCode) : 0,
2937 /* (1) select target */
2939 psc.target_score = -DBL_MAX;
2940 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
2941 &target_peer_select_cb,
2943 if (psc.target_score == -DBL_MAX)
2945 delay = get_processing_delay ();
2947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2948 "No peer selected for forwarding of query `%s', will try again in %llu ms!\n",
2949 GNUNET_h2s (&pr->query),
2952 pr->task = GNUNET_SCHEDULER_add_delayed (delay,
2953 &forward_request_task,
2955 return; /* nobody selected */
2957 /* (3) update TTL/priority */
2958 if (pr->client_request_list != NULL)
2960 /* FIXME: use better algorithm!? */
2961 if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2964 /* bound priority we use by priorities we see from other peers
2965 rounded up (must round up so that we can see non-zero
2966 priorities, but round up as little as possible to make it
2967 plausible that we forwarded another peers request) */
2968 if (pr->priority > current_priorities + 1.0)
2969 pr->priority = (uint32_t) current_priorities + 1.0;
2970 pr->ttl = bound_ttl (pr->ttl + TTL_DECREMENT * 2,
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 "Trying query `%s' with priority %u and TTL %d.\n",
2975 GNUNET_h2s (&pr->query),
2981 /* (3) reserve reply bandwidth */
2982 if (GNUNET_NO == pr->forward_only)
2984 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2985 &psc.target.hashPubKey);
2986 GNUNET_assert (NULL != cp);
2987 pr->irc = GNUNET_CORE_peer_change_preference (cfg,
2989 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2990 GNUNET_BANDWIDTH_value_init (UINT32_MAX),
2993 &target_reservation_cb,
2995 cp->inc_preference = 0;
2999 /* force forwarding */
3000 static struct GNUNET_BANDWIDTH_Value32NBO zerobw;
3001 target_reservation_cb (pr, &psc.target,
3002 zerobw, zerobw, 0, 0.0);
3007 /* **************************** P2P PUT Handling ************************ */
3011 * Function called after we either failed or succeeded
3012 * at transmitting a reply to a peer.
3014 * @param cls the requests "struct PendingRequest*"
3015 * @param tpid ID of receiving peer, 0 on transmission error
3018 transmit_reply_continuation (void *cls,
3019 GNUNET_PEER_Id tpid)
3021 struct PendingRequest *pr = cls;
3025 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
3026 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
3027 /* only one reply expected, done with the request! */
3028 destroy_pending_request (pr);
3030 case GNUNET_BLOCK_TYPE_ANY:
3031 case GNUNET_BLOCK_TYPE_FS_KBLOCK:
3032 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
3042 * Transmit the given message by copying it to the target buffer
3043 * "buf". "buf" will be NULL and "size" zero if the socket was closed
3044 * for writing in the meantime. In that case, do nothing
3045 * (the disconnect or shutdown handler will take care of the rest).
3046 * If we were able to transmit messages and there are still more
3047 * pending, ask core again for further calls to this function.
3049 * @param cls closure, pointer to the 'struct ClientList*'
3050 * @param size number of bytes available in buf
3051 * @param buf where the callee should write the message
3052 * @return number of bytes written to buf
3055 transmit_to_client (void *cls,
3056 size_t size, void *buf)
3058 struct ClientList *cl = cls;
3060 struct ClientResponseMessage *creply;
3067 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3068 "Not sending reply, client communication problem.\n");
3073 while ( (NULL != (creply = cl->res_head) ) &&
3074 (creply->msize <= size) )
3076 memcpy (&cbuf[msize], &creply[1], creply->msize);
3077 msize += creply->msize;
3078 size -= creply->msize;
3079 GNUNET_CONTAINER_DLL_remove (cl->res_head,
3082 GNUNET_free (creply);
3085 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
3087 GNUNET_TIME_UNIT_FOREVER_REL,
3088 &transmit_to_client,
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3092 "Transmitted %u bytes to client\n",
3093 (unsigned int) msize);
3100 * Closure for "process_reply" function.
3102 struct ProcessReplyClosure
3105 * The data for the reply.
3110 * Who gave us this reply? NULL for local host (or DHT)
3112 struct ConnectedPeer *sender;
3115 * When the reply expires.
3117 struct GNUNET_TIME_Absolute expiration;
3125 * Type of the block.
3127 enum GNUNET_BLOCK_Type type;
3130 * How much was this reply worth to us?
3135 * Evaluation result (returned).
3137 enum GNUNET_BLOCK_EvaluationResult eval;
3140 * Did we finish processing the associated request?
3145 * Did we find a matching request?
3152 * We have received a reply; handle it!
3154 * @param cls response (struct ProcessReplyClosure)
3155 * @param key our query
3156 * @param value value in the hash map (info about the query)
3157 * @return GNUNET_YES (we should continue to iterate)
3160 process_reply (void *cls,
3161 const GNUNET_HashCode * key,
3164 struct ProcessReplyClosure *prq = cls;
3165 struct PendingRequest *pr = value;
3166 struct PendingMessage *reply;
3167 struct ClientResponseMessage *creply;
3168 struct ClientList *cl;
3169 struct PutMessage *pm;
3170 struct ConnectedPeer *cp;
3171 struct GNUNET_TIME_Relative cur_delay;
3173 struct GNUNET_TIME_Relative art_delay;
3179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3180 "Matched result (type %u) for query `%s' with pending request\n",
3181 (unsigned int) prq->type,
3184 GNUNET_STATISTICS_update (stats,
3185 gettext_noop ("# replies received and matched"),
3188 if (prq->sender != NULL)
3190 for (i=0;i<pr->used_targets_off;i++)
3191 if (pr->used_targets[i].pid == prq->sender->pid)
3193 if (i < pr->used_targets_off)
3195 cur_delay = GNUNET_TIME_absolute_get_duration (pr->used_targets[i].last_request_time);
3196 prq->sender->avg_delay.rel_value
3197 = (prq->sender->avg_delay.rel_value *
3198 (RUNAVG_DELAY_N - 1) + cur_delay.rel_value) / RUNAVG_DELAY_N;
3199 prq->sender->avg_priority
3200 = (prq->sender->avg_priority *
3201 (RUNAVG_DELAY_N - 1) + pr->priority) / (double) RUNAVG_DELAY_N;
3205 GNUNET_PEER_change_rc (prq->sender->last_p2p_replies
3206 [prq->sender->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE],
3208 GNUNET_PEER_change_rc (pr->cp->pid, 1);
3209 prq->sender->last_p2p_replies
3210 [(prq->sender->last_p2p_replies_woff++) % P2P_SUCCESS_LIST_SIZE]
3215 if (NULL != prq->sender->last_client_replies
3216 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE])
3217 GNUNET_SERVER_client_drop (prq->sender->last_client_replies
3218 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE]);
3219 prq->sender->last_client_replies
3220 [(prq->sender->last_client_replies_woff++) % CS2P_SUCCESS_LIST_SIZE]
3221 = pr->client_request_list->client_list->client;
3222 GNUNET_SERVER_client_keep (pr->client_request_list->client_list->client);
3225 prq->eval = GNUNET_BLOCK_evaluate (block_ctx,
3230 pr->namespace, (pr->namespace != NULL) ? sizeof (GNUNET_HashCode) : 0,
3235 case GNUNET_BLOCK_EVALUATION_OK_MORE:
3237 case GNUNET_BLOCK_EVALUATION_OK_LAST:
3238 while (NULL != pr->pending_head)
3239 destroy_pending_message_list_entry (pr->pending_head);
3242 if (pr->client_request_list != NULL)
3243 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
3245 GNUNET_DATASTORE_cancel (pr->qe);
3248 pr->do_remove = GNUNET_YES;
3249 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
3251 GNUNET_SCHEDULER_cancel (pr->task);
3252 pr->task = GNUNET_SCHEDULER_NO_TASK;
3254 GNUNET_break (GNUNET_YES ==
3255 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
3258 GNUNET_LOAD_update (rt_entry_lifetime,
3259 GNUNET_TIME_absolute_get_duration (pr->start_time).rel_value);
3261 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
3262 GNUNET_STATISTICS_update (stats,
3263 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
3267 /* GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3268 "Duplicate response `%s', discarding.\n",
3269 GNUNET_h2s (&mhash));*/
3271 return GNUNET_YES; /* duplicate */
3272 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
3273 return GNUNET_YES; /* wrong namespace */
3274 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
3277 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
3280 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
3281 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3282 _("Unsupported block type %u\n"),
3286 if (pr->client_request_list != NULL)
3288 if (pr->replies_seen_size == pr->replies_seen_off)
3289 GNUNET_array_grow (pr->replies_seen,
3290 pr->replies_seen_size,
3291 pr->replies_seen_size * 2 + 4);
3292 GNUNET_CRYPTO_hash (prq->data,
3294 &pr->replies_seen[pr->replies_seen_off++]);
3295 refresh_bloomfilter (pr);
3297 if (NULL == prq->sender)
3300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3301 "Found result for query `%s' in local datastore\n",
3304 GNUNET_STATISTICS_update (stats,
3305 gettext_noop ("# results found locally"),
3309 prq->priority += pr->remaining_priority;
3310 pr->remaining_priority = 0;
3311 pr->results_found++;
3312 prq->request_found = GNUNET_YES;
3313 if (NULL != pr->client_request_list)
3315 GNUNET_STATISTICS_update (stats,
3316 gettext_noop ("# replies received for local clients"),
3319 cl = pr->client_request_list->client_list;
3320 msize = sizeof (struct PutMessage) + prq->size;
3321 creply = GNUNET_malloc (msize + sizeof (struct ClientResponseMessage));
3322 creply->msize = msize;
3323 creply->client_list = cl;
3324 GNUNET_CONTAINER_DLL_insert_after (cl->res_head,
3328 pm = (struct PutMessage*) &creply[1];
3329 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
3330 pm->header.size = htons (msize);
3331 pm->type = htonl (prq->type);
3332 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
3333 memcpy (&pm[1], prq->data, prq->size);
3337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3338 "Transmitting result for query `%s' to client\n",
3341 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
3343 GNUNET_TIME_UNIT_FOREVER_REL,
3344 &transmit_to_client,
3347 GNUNET_break (cl->th != NULL);
3350 prq->finished = GNUNET_YES;
3351 destroy_pending_request (pr);
3358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3359 "Transmitting result for query `%s' to other peer (PID=%u)\n",
3361 (unsigned int) cp->pid);
3363 GNUNET_STATISTICS_update (stats,
3364 gettext_noop ("# replies received for other peers"),
3367 msize = sizeof (struct PutMessage) + prq->size;
3368 reply = GNUNET_malloc (msize + sizeof (struct PendingMessage));
3369 reply->cont = &transmit_reply_continuation;
3370 reply->cont_cls = pr;
3372 art_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
3373 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3376 = GNUNET_TIME_relative_to_absolute (art_delay);
3377 GNUNET_STATISTICS_update (stats,
3378 gettext_noop ("cummulative artificial delay introduced (ms)"),
3379 art_delay.abs_value,
3382 reply->msize = msize;
3383 reply->priority = UINT32_MAX; /* send replies first! */
3384 pm = (struct PutMessage*) &reply[1];
3385 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
3386 pm->header.size = htons (msize);
3387 pm->type = htonl (prq->type);
3388 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
3389 memcpy (&pm[1], prq->data, prq->size);
3390 add_to_pending_messages_for_peer (cp, reply, pr);
3397 * Iterator called on each result obtained for a DHT
3398 * operation that expects a reply
3400 * @param cls closure
3401 * @param exp when will this value expire
3402 * @param key key of the result
3403 * @param get_path NULL-terminated array of pointers
3404 * to the peers on reverse GET path (or NULL if not recorded)
3405 * @param put_path NULL-terminated array of pointers
3406 * to the peers on the PUT path (or NULL if not recorded)
3407 * @param type type of the result
3408 * @param size number of bytes in data
3409 * @param data pointer to the result data
3412 process_dht_reply (void *cls,
3413 struct GNUNET_TIME_Absolute exp,
3414 const GNUNET_HashCode * key,
3415 const struct GNUNET_PeerIdentity * const *get_path,
3416 const struct GNUNET_PeerIdentity * const *put_path,
3417 enum GNUNET_BLOCK_Type type,
3421 struct PendingRequest *pr = cls;
3422 struct ProcessReplyClosure prq;
3424 memset (&prq, 0, sizeof (prq));
3426 prq.expiration = exp;
3429 process_reply (&prq, key, pr);
3435 * Continuation called to notify client about result of the
3438 * @param cls closure
3439 * @param success GNUNET_SYSERR on failure
3440 * @param msg NULL on success, otherwise an error message
3443 put_migration_continuation (void *cls,
3447 struct GNUNET_TIME_Absolute *start = cls;
3448 struct GNUNET_TIME_Relative delay;
3450 delay = GNUNET_TIME_absolute_get_duration (*start);
3451 GNUNET_free (start);
3452 GNUNET_LOAD_update (datastore_put_load,
3454 if (GNUNET_OK == success)
3456 GNUNET_STATISTICS_update (stats,
3457 gettext_noop ("# datastore 'put' failures"),
3464 * Handle P2P "PUT" message.
3466 * @param cls closure, always NULL
3467 * @param other the other peer involved (sender or receiver, NULL
3468 * for loopback messages where we are both sender and receiver)
3469 * @param message the actual message
3470 * @param latency reported latency of the connection with 'other'
3471 * @param distance reported distance (DV) to 'other'
3472 * @return GNUNET_OK to keep the connection open,
3473 * GNUNET_SYSERR to close it (signal serious error)
3476 handle_p2p_put (void *cls,
3477 const struct GNUNET_PeerIdentity *other,
3478 const struct GNUNET_MessageHeader *message,
3479 struct GNUNET_TIME_Relative latency,
3482 const struct PutMessage *put;
3485 enum GNUNET_BLOCK_Type type;
3486 struct GNUNET_TIME_Absolute expiration;
3487 GNUNET_HashCode query;
3488 struct ProcessReplyClosure prq;
3489 struct GNUNET_TIME_Absolute *start;
3490 struct GNUNET_TIME_Relative block_time;
3492 struct ConnectedPeer *cp;
3493 struct PendingMessage *pm;
3494 struct MigrationStopMessage *msm;
3496 msize = ntohs (message->size);
3497 if (msize < sizeof (struct PutMessage))
3500 return GNUNET_SYSERR;
3502 put = (const struct PutMessage*) message;
3503 dsize = msize - sizeof (struct PutMessage);
3504 type = ntohl (put->type);
3505 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
3507 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
3508 return GNUNET_SYSERR;
3510 GNUNET_BLOCK_get_key (block_ctx,
3516 GNUNET_break_op (0);
3517 return GNUNET_SYSERR;
3520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3521 "Received result for query `%s' from peer `%4s'\n",
3522 GNUNET_h2s (&query),
3523 GNUNET_i2s (other));
3525 GNUNET_STATISTICS_update (stats,
3526 gettext_noop ("# replies received (overall)"),
3529 /* now, lookup 'query' */
3530 prq.data = (const void*) &put[1];
3532 prq.sender = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3533 &other->hashPubKey);
3538 prq.expiration = expiration;
3540 prq.finished = GNUNET_NO;
3541 prq.request_found = GNUNET_NO;
3542 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3546 if (prq.sender != NULL)
3548 prq.sender->inc_preference += CONTENT_BANDWIDTH_VALUE + 1000 * prq.priority;
3549 change_host_trust (prq.sender, prq.priority);
3551 if ( (GNUNET_YES == active_migration) &&
3552 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
3555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3556 "Replicating result for query `%s' with priority %u\n",
3557 GNUNET_h2s (&query),
3560 start = GNUNET_malloc (sizeof (struct GNUNET_TIME_Absolute));
3561 *start = GNUNET_TIME_absolute_get ();
3562 GNUNET_DATASTORE_put (dsh,
3563 0, &query, dsize, &put[1],
3564 type, prq.priority, 1 /* anonymity */,
3566 1 + prq.priority, MAX_DATASTORE_QUEUE,
3567 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
3568 &put_migration_continuation,
3571 putl = GNUNET_LOAD_get_load (datastore_put_load);
3572 if ( (GNUNET_NO == prq.request_found) &&
3573 ( (GNUNET_YES != active_migration) ||
3574 (putl > 2.5 * (1 + prq.priority)) ) )
3576 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3577 &other->hashPubKey);
3578 if (GNUNET_TIME_absolute_get_duration (cp->last_migration_block).rel_value < 5000)
3579 return GNUNET_OK; /* already blocked */
3580 /* We're too busy; send MigrationStop message! */
3581 if (GNUNET_YES != active_migration)
3582 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
3583 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
3584 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3585 (unsigned int) (60000 * putl * putl)));
3587 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
3588 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
3589 sizeof (struct MigrationStopMessage));
3590 pm->msize = sizeof (struct MigrationStopMessage);
3591 pm->priority = UINT32_MAX;
3592 msm = (struct MigrationStopMessage*) &pm[1];
3593 msm->header.size = htons (sizeof (struct MigrationStopMessage));
3594 msm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
3595 msm->duration = GNUNET_TIME_relative_hton (block_time);
3596 add_to_pending_messages_for_peer (cp,
3605 * Handle P2P "MIGRATION_STOP" message.
3607 * @param cls closure, always NULL
3608 * @param other the other peer involved (sender or receiver, NULL
3609 * for loopback messages where we are both sender and receiver)
3610 * @param message the actual message
3611 * @param latency reported latency of the connection with 'other'
3612 * @param distance reported distance (DV) to 'other'
3613 * @return GNUNET_OK to keep the connection open,
3614 * GNUNET_SYSERR to close it (signal serious error)
3617 handle_p2p_migration_stop (void *cls,
3618 const struct GNUNET_PeerIdentity *other,
3619 const struct GNUNET_MessageHeader *message,
3620 struct GNUNET_TIME_Relative latency,
3623 struct ConnectedPeer *cp;
3624 const struct MigrationStopMessage *msm;
3626 msm = (const struct MigrationStopMessage*) message;
3627 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3628 &other->hashPubKey);
3634 cp->migration_blocked = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (msm->duration));
3640 /* **************************** P2P GET Handling ************************ */
3644 * Closure for 'check_duplicate_request_{peer,client}'.
3646 struct CheckDuplicateRequestClosure
3649 * The new request we should check if it already exists.
3651 const struct PendingRequest *pr;
3654 * Existing request found by the checker, NULL if none.
3656 struct PendingRequest *have;
3661 * Iterator over entries in the 'query_request_map' that
3662 * tries to see if we have the same request pending from
3663 * the same client already.
3665 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
3666 * @param key current key code (query, ignored, must match)
3667 * @param value value in the hash map (a 'struct PendingRequest'
3668 * that already exists)
3669 * @return GNUNET_YES if we should continue to
3670 * iterate (no match yet)
3671 * GNUNET_NO if not (match found).
3674 check_duplicate_request_client (void *cls,
3675 const GNUNET_HashCode * key,
3678 struct CheckDuplicateRequestClosure *cdc = cls;
3679 struct PendingRequest *have = value;
3681 if (have->client_request_list == NULL)
3683 if ( (cdc->pr->client_request_list->client_list->client == have->client_request_list->client_list->client) &&
3694 * We're processing (local) results for a search request
3695 * from another peer. Pass applicable results to the
3696 * peer and if we are done either clean up (operation
3697 * complete) or forward to other peers (more results possible).
3699 * @param cls our closure (struct LocalGetContext)
3700 * @param key key for the content
3701 * @param size number of bytes in data
3702 * @param data content stored
3703 * @param type type of the content
3704 * @param priority priority of the content
3705 * @param anonymity anonymity-level for the content
3706 * @param expiration expiration time for the content
3707 * @param uid unique identifier for the datum;
3708 * maybe 0 if no unique identifier is available
3711 process_local_reply (void *cls,
3712 const GNUNET_HashCode * key,
3715 enum GNUNET_BLOCK_Type type,
3718 struct GNUNET_TIME_Absolute
3722 struct PendingRequest *pr = cls;
3723 struct ProcessReplyClosure prq;
3724 struct CheckDuplicateRequestClosure cdrc;
3725 GNUNET_HashCode query;
3726 unsigned int old_rf;
3731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3732 "Done processing local replies, forwarding request to other peers.\n");
3735 if (pr->client_request_list != NULL)
3737 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
3739 /* Figure out if this is a duplicate request and possibly
3740 merge 'struct PendingRequest' entries */
3743 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3745 &check_duplicate_request_client,
3747 if (cdrc.have != NULL)
3750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3751 "Received request for block `%s' twice from client, will only request once.\n",
3752 GNUNET_h2s (&pr->query));
3755 destroy_pending_request (pr);
3759 if (pr->local_only == GNUNET_YES)
3761 destroy_pending_request (pr);
3764 /* no more results */
3765 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
3766 pr->task = GNUNET_SCHEDULER_add_now (&forward_request_task,
3771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3772 "New local response to `%s' of type %u.\n",
3776 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
3779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3780 "Found ONDEMAND block, performing on-demand encoding\n");
3782 GNUNET_STATISTICS_update (stats,
3783 gettext_noop ("# on-demand blocks matched requests"),
3787 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
3788 anonymity, expiration, uid,
3789 &process_local_reply,
3793 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3797 old_rf = pr->results_found;
3798 memset (&prq, 0, sizeof (prq));
3800 prq.expiration = expiration;
3803 GNUNET_BLOCK_get_key (block_ctx,
3810 GNUNET_DATASTORE_remove (dsh,
3814 GNUNET_TIME_UNIT_FOREVER_REL,
3816 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3820 prq.priority = priority;
3821 prq.finished = GNUNET_NO;
3822 prq.request_found = GNUNET_NO;
3823 if ( (old_rf == 0) &&
3824 (pr->results_found == 0) )
3825 update_datastore_delays (pr->start_time);
3826 process_reply (&prq, key, pr);
3827 if (prq.finished == GNUNET_YES)
3830 return; /* done here */
3831 if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
3833 pr->local_only = GNUNET_YES; /* do not forward */
3834 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
3837 if ( (pr->client_request_list == NULL) &&
3838 ( (GNUNET_YES == test_get_load_too_high (0)) ||
3839 (pr->results_found > 5 + 2 * pr->priority) ) )
3842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3843 "Load too high, done with request\n");
3845 GNUNET_STATISTICS_update (stats,
3846 gettext_noop ("# processing result set cut short due to load"),
3849 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
3852 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3857 * We've received a request with the specified priority. Bound it
3858 * according to how much we trust the given peer.
3860 * @param prio_in requested priority
3861 * @param cp the peer making the request
3862 * @return effective priority
3865 bound_priority (uint32_t prio_in,
3866 struct ConnectedPeer *cp)
3868 #define N ((double)128.0)
3873 ld = test_get_load_too_high (0);
3874 if (ld == GNUNET_SYSERR)
3876 GNUNET_STATISTICS_update (stats,
3877 gettext_noop ("# requests done for free (low load)"),
3880 return 0; /* excess resources */
3882 if (prio_in > INT32_MAX)
3883 prio_in = INT32_MAX;
3884 ret = - change_host_trust (cp, - (int) prio_in);
3887 if (ret > current_priorities + N)
3888 rret = current_priorities + N;
3892 = (current_priorities * (N-1) + rret)/N;
3894 if ( (ld == GNUNET_YES) && (ret > 0) )
3896 /* try with charging */
3897 ld = test_get_load_too_high (ret);
3899 if (ld == GNUNET_YES)
3901 GNUNET_STATISTICS_update (stats,
3902 gettext_noop ("# request dropped, priority insufficient"),
3906 change_host_trust (cp, (int) ret);
3907 return -1; /* not enough resources */
3911 GNUNET_STATISTICS_update (stats,
3912 gettext_noop ("# requests done for a price (normal load)"),
3922 * Iterator over entries in the 'query_request_map' that
3923 * tries to see if we have the same request pending from
3924 * the same peer already.
3926 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
3927 * @param key current key code (query, ignored, must match)
3928 * @param value value in the hash map (a 'struct PendingRequest'
3929 * that already exists)
3930 * @return GNUNET_YES if we should continue to
3931 * iterate (no match yet)
3932 * GNUNET_NO if not (match found).
3935 check_duplicate_request_peer (void *cls,
3936 const GNUNET_HashCode * key,
3939 struct CheckDuplicateRequestClosure *cdc = cls;
3940 struct PendingRequest *have = value;
3942 if (cdc->pr->target_pid == have->target_pid)
3952 * Handle P2P "GET" request.
3954 * @param cls closure, always NULL
3955 * @param other the other peer involved (sender or receiver, NULL
3956 * for loopback messages where we are both sender and receiver)
3957 * @param message the actual message
3958 * @param latency reported latency of the connection with 'other'
3959 * @param distance reported distance (DV) to 'other'
3960 * @return GNUNET_OK to keep the connection open,
3961 * GNUNET_SYSERR to close it (signal serious error)
3964 handle_p2p_get (void *cls,
3965 const struct GNUNET_PeerIdentity *other,
3966 const struct GNUNET_MessageHeader *message,
3967 struct GNUNET_TIME_Relative latency,
3970 struct PendingRequest *pr;
3971 struct ConnectedPeer *cp;
3972 struct ConnectedPeer *cps;
3973 struct CheckDuplicateRequestClosure cdc;
3974 struct GNUNET_TIME_Relative timeout;
3976 const struct GetMessage *gm;
3978 const GNUNET_HashCode *opt;
3981 uint32_t ttl_decrement;
3983 enum GNUNET_BLOCK_Type type;
3986 msize = ntohs(message->size);
3987 if (msize < sizeof (struct GetMessage))
3989 GNUNET_break_op (0);
3990 return GNUNET_SYSERR;
3992 gm = (const struct GetMessage*) message;
3994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3995 "Received request for `%s'\n",
3996 GNUNET_h2s (&gm->query));
3998 type = ntohl (gm->type);
3999 bm = ntohl (gm->hash_bitmap);
4007 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
4009 GNUNET_break_op (0);
4010 return GNUNET_SYSERR;
4012 opt = (const GNUNET_HashCode*) &gm[1];
4013 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
4014 /* bfsize must be power of 2, check! */
4015 if (0 != ( (bfsize - 1) & bfsize))
4017 GNUNET_break_op (0);
4018 return GNUNET_SYSERR;
4020 bm = ntohl (gm->hash_bitmap);
4022 cps = GNUNET_CONTAINER_multihashmap_get (connected_peers,
4023 &other->hashPubKey);
4026 /* peer must have just disconnected */
4027 GNUNET_STATISTICS_update (stats,
4028 gettext_noop ("# requests dropped due to initiator not being connected"),
4031 return GNUNET_SYSERR;
4033 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
4034 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
4041 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
4042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4043 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
4044 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
4047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4048 "Failed to find peer `%4s' in connection set. Dropping query.\n",
4049 GNUNET_i2s (other));
4051 GNUNET_STATISTICS_update (stats,
4052 gettext_noop ("# requests dropped due to missing reverse route"),
4055 /* FIXME: try connect? */
4058 /* note that we can really only check load here since otherwise
4059 peers could find out that we are overloaded by not being
4060 disconnected after sending us a malformed query... */
4061 priority = bound_priority (ntohl (gm->priority), cps);
4065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4066 "Dropping query from `%s', this peer is too busy.\n",
4067 GNUNET_i2s (other));
4072 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4073 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
4074 GNUNET_h2s (&gm->query),
4075 (unsigned int) type,
4079 have_ns = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE));
4080 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
4081 (have_ns ? sizeof(GNUNET_HashCode) : 0));
4084 pr->namespace = (GNUNET_HashCode*) &pr[1];
4085 memcpy (&pr[1], &opt[bits++], sizeof (GNUNET_HashCode));
4087 if ( (GNUNET_LOAD_get_load (cp->transmission_delay) > 3 * (1 + priority)) ||
4088 (GNUNET_LOAD_get_average (cp->transmission_delay) >
4089 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 + GNUNET_LOAD_get_average (rt_entry_lifetime)) )
4091 /* don't have BW to send to peer, or would likely take longer than we have for it,
4092 so at best indirect the query */
4094 pr->forward_only = GNUNET_YES;
4097 pr->mingle = ntohl (gm->filter_mutator);
4098 if (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO))
4099 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &opt[bits++]);
4100 pr->anonymity_level = 1;
4101 pr->priority = (uint32_t) priority;
4102 pr->ttl = bound_ttl (ntohl (gm->ttl), pr->priority);
4103 pr->query = gm->query;
4104 /* decrement ttl (always) */
4105 ttl_decrement = 2 * TTL_DECREMENT +
4106 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
4108 if ( (pr->ttl < 0) &&
4109 (((int32_t)(pr->ttl - ttl_decrement)) > 0) )
4112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4113 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
4118 GNUNET_STATISTICS_update (stats,
4119 gettext_noop ("# requests dropped due TTL underflow"),
4122 /* integer underflow => drop (should be very rare)! */
4126 pr->ttl -= ttl_decrement;
4127 pr->start_time = GNUNET_TIME_absolute_get ();
4129 /* get bloom filter */
4132 pr->bf = GNUNET_CONTAINER_bloomfilter_init ((const char*) &opt[bits],
4135 pr->bf_size = bfsize;
4139 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
4141 &check_duplicate_request_peer,
4143 if (cdc.have != NULL)
4145 if (cdc.have->start_time.abs_value + cdc.have->ttl >=
4146 pr->start_time.abs_value + pr->ttl)
4148 /* existing request has higher TTL, drop new one! */
4149 cdc.have->priority += pr->priority;
4150 destroy_pending_request (pr);
4152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4153 "Have existing request with higher TTL, dropping new request.\n",
4154 GNUNET_i2s (other));
4156 GNUNET_STATISTICS_update (stats,
4157 gettext_noop ("# requests dropped due to higher-TTL request"),
4164 /* existing request has lower TTL, drop old one! */
4165 pr->priority += cdc.have->priority;
4166 /* Possible optimization: if we have applicable pending
4167 replies in 'cdc.have', we might want to move those over
4168 (this is a really rare special-case, so it is not clear
4169 that this would be worth it) */
4170 destroy_pending_request (cdc.have);
4171 /* keep processing 'pr'! */
4176 GNUNET_break (GNUNET_OK ==
4177 GNUNET_CONTAINER_multihashmap_put (query_request_map,
4180 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4181 GNUNET_break (GNUNET_OK ==
4182 GNUNET_CONTAINER_multihashmap_put (peer_request_map,
4185 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4187 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
4189 pr->start_time.abs_value + pr->ttl);
4191 GNUNET_STATISTICS_update (stats,
4192 gettext_noop ("# P2P searches received"),
4195 GNUNET_STATISTICS_update (stats,
4196 gettext_noop ("# P2P searches active"),
4200 /* calculate change in traffic preference */
4201 cps->inc_preference += pr->priority * 1000 + QUERY_BANDWIDTH_VALUE;
4202 /* process locally */
4203 if (type == GNUNET_BLOCK_TYPE_FS_DBLOCK)
4204 type = GNUNET_BLOCK_TYPE_ANY; /* to get on-demand as well */
4205 timeout = GNUNET_TIME_relative_multiply (BASIC_DATASTORE_REQUEST_DELAY,
4206 (pr->priority + 1));
4207 if (GNUNET_YES != pr->forward_only)
4210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4211 "Handing request for `%s' to datastore\n",
4212 GNUNET_h2s (&gm->query));
4214 pr->qe = GNUNET_DATASTORE_get (dsh,
4218 MAX_DATASTORE_QUEUE,
4220 &process_local_reply,
4224 GNUNET_STATISTICS_update (stats,
4225 gettext_noop ("# requests dropped by datastore (queue length limit)"),
4232 GNUNET_STATISTICS_update (stats,
4233 gettext_noop ("# requests forwarded due to high load"),
4238 /* Are multiple results possible (and did we look locally)? If so, start processing remotely now! */
4241 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
4242 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
4243 /* only one result, wait for datastore */
4244 if (GNUNET_YES != pr->forward_only)
4246 GNUNET_STATISTICS_update (stats,
4247 gettext_noop ("# requests not instantly forwarded (waiting for datastore)"),
4253 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
4254 pr->task = GNUNET_SCHEDULER_add_now (&forward_request_task,
4258 /* make sure we don't track too many requests */
4259 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
4261 pr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
4262 GNUNET_assert (pr != NULL);
4263 destroy_pending_request (pr);
4269 /* **************************** CS GET Handling ************************ */
4273 * Handle START_SEARCH-message (search request from client).
4275 * @param cls closure
4276 * @param client identification of the client
4277 * @param message the actual message
4280 handle_start_search (void *cls,
4281 struct GNUNET_SERVER_Client *client,
4282 const struct GNUNET_MessageHeader *message)
4284 static GNUNET_HashCode all_zeros;
4285 const struct SearchMessage *sm;
4286 struct ClientList *cl;
4287 struct ClientRequestList *crl;
4288 struct PendingRequest *pr;
4291 enum GNUNET_BLOCK_Type type;
4293 msize = ntohs (message->size);
4294 if ( (msize < sizeof (struct SearchMessage)) ||
4295 (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
4298 GNUNET_SERVER_receive_done (client,
4302 GNUNET_STATISTICS_update (stats,
4303 gettext_noop ("# client searches received"),
4306 sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
4307 sm = (const struct SearchMessage*) message;
4308 type = ntohl (sm->type);
4310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4311 "Received request for `%s' of type %u from local client\n",
4312 GNUNET_h2s (&sm->query),
4313 (unsigned int) type);
4316 while ( (cl != NULL) &&
4317 (cl->client != client) )
4321 cl = GNUNET_malloc (sizeof (struct ClientList));
4322 cl->client = client;
4323 GNUNET_SERVER_client_keep (client);
4324 cl->next = client_list;
4327 /* detect duplicate KBLOCK requests */
4328 if ( (type == GNUNET_BLOCK_TYPE_FS_KBLOCK) ||
4329 (type == GNUNET_BLOCK_TYPE_FS_NBLOCK) ||
4330 (type == GNUNET_BLOCK_TYPE_ANY) )
4333 while ( (crl != NULL) &&
4334 ( (0 != memcmp (&crl->req->query,
4336 sizeof (GNUNET_HashCode))) ||
4337 (crl->req->type != type) ) )
4342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4343 "Have existing request, merging content-seen lists.\n");
4346 /* Duplicate request (used to send long list of
4347 known/blocked results); merge 'pr->replies_seen'
4348 and update bloom filter */
4349 GNUNET_array_grow (pr->replies_seen,
4350 pr->replies_seen_size,
4351 pr->replies_seen_off + sc);
4352 memcpy (&pr->replies_seen[pr->replies_seen_off],
4354 sc * sizeof (GNUNET_HashCode));
4355 pr->replies_seen_off += sc;
4356 refresh_bloomfilter (pr);
4357 GNUNET_STATISTICS_update (stats,
4358 gettext_noop ("# client searches updated (merged content seen list)"),
4361 GNUNET_SERVER_receive_done (client,
4366 GNUNET_STATISTICS_update (stats,
4367 gettext_noop ("# client searches active"),
4370 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
4371 ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? sizeof(GNUNET_HashCode) : 0));
4372 crl = GNUNET_malloc (sizeof (struct ClientRequestList));
4373 memset (crl, 0, sizeof (struct ClientRequestList));
4374 crl->client_list = cl;
4375 GNUNET_CONTAINER_DLL_insert (cl->rl_head,
4380 pr->client_request_list = crl;
4381 GNUNET_array_grow (pr->replies_seen,
4382 pr->replies_seen_size,
4384 memcpy (pr->replies_seen,
4386 sc * sizeof (GNUNET_HashCode));
4387 pr->replies_seen_off = sc;
4388 pr->anonymity_level = ntohl (sm->anonymity_level);
4389 pr->start_time = GNUNET_TIME_absolute_get ();
4390 refresh_bloomfilter (pr);
4391 pr->query = sm->query;
4392 if (0 == (1 & ntohl (sm->options)))
4393 pr->local_only = GNUNET_NO;
4395 pr->local_only = GNUNET_YES;
4398 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
4399 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
4400 if (0 != memcmp (&sm->target,
4402 sizeof (GNUNET_HashCode)))
4403 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &sm->target);
4405 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
4406 pr->namespace = (GNUNET_HashCode*) &pr[1];
4407 memcpy (&pr[1], &sm->target, sizeof (GNUNET_HashCode));
4412 GNUNET_break (GNUNET_OK ==
4413 GNUNET_CONTAINER_multihashmap_put (query_request_map,
4416 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4417 if (type == GNUNET_BLOCK_TYPE_FS_DBLOCK)
4418 type = GNUNET_BLOCK_TYPE_ANY; /* get on-demand blocks too! */
4419 pr->qe = GNUNET_DATASTORE_get (dsh,
4423 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
4424 &process_local_reply,
4429 /* **************************** Startup ************************ */
4432 * Process fs requests.
4434 * @param server the initialized server
4435 * @param c configuration to use
4438 main_init (struct GNUNET_SERVER_Handle *server,
4439 const struct GNUNET_CONFIGURATION_Handle *c)
4441 static const struct GNUNET_CORE_MessageHandler p2p_handlers[] =
4444 GNUNET_MESSAGE_TYPE_FS_GET, 0 },
4446 GNUNET_MESSAGE_TYPE_FS_PUT, 0 },
4447 { &handle_p2p_migration_stop,
4448 GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP,
4449 sizeof (struct MigrationStopMessage) },
4452 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4453 {&GNUNET_FS_handle_index_start, NULL,
4454 GNUNET_MESSAGE_TYPE_FS_INDEX_START, 0},
4455 {&GNUNET_FS_handle_index_list_get, NULL,
4456 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET, sizeof(struct GNUNET_MessageHeader) },
4457 {&GNUNET_FS_handle_unindex, NULL, GNUNET_MESSAGE_TYPE_FS_UNINDEX,
4458 sizeof (struct UnindexMessage) },
4459 {&handle_start_search, NULL, GNUNET_MESSAGE_TYPE_FS_START_SEARCH,
4463 unsigned long long enc = 128;
4466 stats = GNUNET_STATISTICS_create ("fs", cfg);
4467 min_migration_delay = GNUNET_TIME_UNIT_SECONDS;
4469 GNUNET_CONFIGURATION_get_value_number (cfg,
4471 "MAX_PENDING_REQUESTS",
4472 &max_pending_requests)) ||
4474 GNUNET_CONFIGURATION_get_value_number (cfg,
4476 "EXPECTED_NEIGHBOUR_COUNT",
4479 GNUNET_CONFIGURATION_get_value_time (cfg,
4481 "MIN_MIGRATION_DELAY",
4482 &min_migration_delay)) )
4484 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4485 _("Configuration fails to specify certain parameters, assuming default values."));
4487 connected_peers = GNUNET_CONTAINER_multihashmap_create (enc);
4488 query_request_map = GNUNET_CONTAINER_multihashmap_create (max_pending_requests);
4489 rt_entry_lifetime = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_FOREVER_REL);
4490 peer_request_map = GNUNET_CONTAINER_multihashmap_create (enc);
4491 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
4492 core = GNUNET_CORE_connect (cfg,
4494 GNUNET_TIME_UNIT_FOREVER_REL,
4497 &peer_connect_handler,
4498 &peer_disconnect_handler,
4499 &peer_status_handler,
4505 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4506 _("Failed to connect to `%s' service.\n"),
4508 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
4509 connected_peers = NULL;
4510 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
4511 query_request_map = NULL;
4512 GNUNET_LOAD_value_free (rt_entry_lifetime);
4513 rt_entry_lifetime = NULL;
4514 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
4515 requests_by_expiration_heap = NULL;
4516 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
4517 peer_request_map = NULL;
4520 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
4523 return GNUNET_SYSERR;
4525 /* FIXME: distinguish between sending and storing in options? */
4526 if (active_migration)
4528 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4529 _("Content migration is enabled, will start to gather data\n"));
4530 consider_migration_gathering ();
4532 consider_dht_put_gathering (NULL);
4533 GNUNET_SERVER_disconnect_notify (server,
4534 &handle_client_disconnect,
4536 GNUNET_assert (GNUNET_OK ==
4537 GNUNET_CONFIGURATION_get_value_filename (cfg,
4541 GNUNET_DISK_directory_create (trustDirectory);
4542 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
4543 &cron_flush_trust, NULL);
4546 GNUNET_SERVER_add_handlers (server, handlers);
4547 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4555 * Process fs requests.
4557 * @param cls closure
4558 * @param server the initialized server
4559 * @param cfg configuration to use
4563 struct GNUNET_SERVER_Handle *server,
4564 const struct GNUNET_CONFIGURATION_Handle *cfg)
4566 active_migration = GNUNET_CONFIGURATION_get_value_yesno (cfg,
4569 dsh = GNUNET_DATASTORE_connect (cfg);
4572 GNUNET_SCHEDULER_shutdown ();
4575 datastore_get_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
4576 datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
4577 block_cfg = GNUNET_CONFIGURATION_create ();
4578 GNUNET_CONFIGURATION_set_value_string (block_cfg,
4582 block_ctx = GNUNET_BLOCK_context_create (block_cfg);
4583 GNUNET_assert (NULL != block_ctx);
4584 dht_handle = GNUNET_DHT_connect (cfg,
4586 if ( (GNUNET_OK != GNUNET_FS_indexing_init (cfg, dsh)) ||
4587 (GNUNET_OK != main_init (server, cfg)) )
4589 GNUNET_SCHEDULER_shutdown ();
4590 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
4592 GNUNET_DHT_disconnect (dht_handle);
4594 GNUNET_BLOCK_context_destroy (block_ctx);
4596 GNUNET_CONFIGURATION_destroy (block_cfg);
4598 GNUNET_LOAD_value_free (datastore_get_load);
4599 datastore_get_load = NULL;
4600 GNUNET_LOAD_value_free (datastore_put_load);
4601 datastore_put_load = NULL;
4608 * The main function for the fs service.
4610 * @param argc number of arguments from the command line
4611 * @param argv command line arguments
4612 * @return 0 ok, 1 on error
4615 main (int argc, char *const *argv)
4617 return (GNUNET_OK ==
4618 GNUNET_SERVICE_run (argc,
4621 GNUNET_SERVICE_OPTION_NONE,
4622 &run, NULL)) ? 0 : 1;
4625 /* end of gnunet-service-fs.c */