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3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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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 struct GNUNET_SCHEDULER_Handle *sched;
781 static const struct GNUNET_CONFIGURATION_Handle *cfg;
784 * Map of peer identifiers to "struct ConnectedPeer" (for that peer).
786 static struct GNUNET_CONTAINER_MultiHashMap *connected_peers;
789 * Map of peer identifiers to "struct PendingRequest" (for that peer).
791 static struct GNUNET_CONTAINER_MultiHashMap *peer_request_map;
794 * Map of query identifiers to "struct PendingRequest" (for that query).
796 static struct GNUNET_CONTAINER_MultiHashMap *query_request_map;
799 * Heap with the request that will expire next at the top. Contains
800 * pointers of type "struct PendingRequest*"; these will *also* be
801 * aliased from the "requests_by_peer" data structures and the
802 * "requests_by_query" table. Note that requests from our clients
803 * don't expire and are thus NOT in the "requests_by_expiration"
804 * (or the "requests_by_peer" tables).
806 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
809 * Handle for reporting statistics.
811 static struct GNUNET_STATISTICS_Handle *stats;
814 * Linked list of clients we are currently processing requests for.
816 static struct ClientList *client_list;
819 * Pointer to handle to the core service (points to NULL until we've
822 static struct GNUNET_CORE_Handle *core;
825 * Head of linked list of blocks that can be migrated.
827 static struct MigrationReadyBlock *mig_head;
830 * Tail of linked list of blocks that can be migrated.
832 static struct MigrationReadyBlock *mig_tail;
835 * Request to datastore for migration (or NULL).
837 static struct GNUNET_DATASTORE_QueueEntry *mig_qe;
840 * Request to datastore for DHT PUTs (or NULL).
842 static struct GNUNET_DATASTORE_QueueEntry *dht_qe;
845 * Type we will request for the next DHT PUT round from the datastore.
847 static enum GNUNET_BLOCK_Type dht_put_type = GNUNET_BLOCK_TYPE_FS_KBLOCK;
850 * Where do we store trust information?
852 static char *trustDirectory;
855 * ID of task that collects blocks for migration.
857 static GNUNET_SCHEDULER_TaskIdentifier mig_task;
860 * ID of task that collects blocks for DHT PUTs.
862 static GNUNET_SCHEDULER_TaskIdentifier dht_task;
865 * What is the maximum frequency at which we are allowed to
866 * poll the datastore for migration content?
868 static struct GNUNET_TIME_Relative min_migration_delay;
871 * Handle for DHT operations.
873 static struct GNUNET_DHT_Handle *dht_handle;
876 * Size of the doubly-linked list of migration blocks.
878 static unsigned int mig_size;
881 * Are we allowed to migrate content to this peer.
883 static int active_migration;
886 * How many entires with zero anonymity do we currently estimate
887 * to have in the database?
889 static unsigned int zero_anonymity_count_estimate;
892 * Typical priorities we're seeing from other peers right now. Since
893 * most priorities will be zero, this value is the weighted average of
894 * non-zero priorities seen "recently". In order to ensure that new
895 * values do not dramatically change the ratio, values are first
896 * "capped" to a reasonable range (+N of the current value) and then
897 * averaged into the existing value by a ratio of 1:N. Hence
898 * receiving the largest possible priority can still only raise our
899 * "current_priorities" by at most 1.
901 static double current_priorities;
904 * Datastore 'GET' load tracking.
906 static struct GNUNET_LOAD_Value *datastore_get_load;
909 * Datastore 'PUT' load tracking.
911 static struct GNUNET_LOAD_Value *datastore_put_load;
914 * How long do requests typically stay in the routing table?
916 static struct GNUNET_LOAD_Value *rt_entry_lifetime;
919 * We've just now completed a datastore request. Update our
920 * datastore load calculations.
922 * @param start time when the datastore request was issued
925 update_datastore_delays (struct GNUNET_TIME_Absolute start)
927 struct GNUNET_TIME_Relative delay;
929 delay = GNUNET_TIME_absolute_get_duration (start);
930 GNUNET_LOAD_update (datastore_get_load,
936 * Get the filename under which we would store the GNUNET_HELLO_Message
937 * for the given host and protocol.
938 * @return filename of the form DIRECTORY/HOSTID
941 get_trust_filename (const struct GNUNET_PeerIdentity *id)
943 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
946 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
947 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
954 * Transmit messages by copying it to the target buffer
955 * "buf". "buf" will be NULL and "size" zero if the socket was closed
956 * for writing in the meantime. In that case, do nothing
957 * (the disconnect or shutdown handler will take care of the rest).
958 * If we were able to transmit messages and there are still more
959 * pending, ask core again for further calls to this function.
961 * @param cls closure, pointer to the 'struct ConnectedPeer*'
962 * @param size number of bytes available in buf
963 * @param buf where the callee should write the message
964 * @return number of bytes written to buf
967 transmit_to_peer (void *cls,
968 size_t size, void *buf);
971 /* ******************* clean up functions ************************ */
974 * Delete the given migration block.
976 * @param mb block to delete
979 delete_migration_block (struct MigrationReadyBlock *mb)
981 GNUNET_CONTAINER_DLL_remove (mig_head,
984 GNUNET_PEER_decrement_rcs (mb->target_list,
985 MIGRATION_LIST_SIZE);
992 * Compare the distance of two peers to a key.
995 * @param p1 first peer
996 * @param p2 second peer
997 * @return GNUNET_YES if P1 is closer to key than P2
1000 is_closer (const GNUNET_HashCode *key,
1001 const struct GNUNET_PeerIdentity *p1,
1002 const struct GNUNET_PeerIdentity *p2)
1004 return GNUNET_CRYPTO_hash_xorcmp (&p1->hashPubKey,
1011 * Consider migrating content to a given peer.
1013 * @param cls 'struct MigrationReadyBlock*' to select
1014 * targets for (or NULL for none)
1015 * @param key ID of the peer
1016 * @param value 'struct ConnectedPeer' of the peer
1017 * @return GNUNET_YES (always continue iteration)
1020 consider_migration (void *cls,
1021 const GNUNET_HashCode *key,
1024 struct MigrationReadyBlock *mb = cls;
1025 struct ConnectedPeer *cp = value;
1026 struct MigrationReadyBlock *pos;
1027 struct GNUNET_PeerIdentity cppid;
1028 struct GNUNET_PeerIdentity otherpid;
1029 struct GNUNET_PeerIdentity worstpid;
1034 /* consider 'cp' as a migration target for mb */
1035 if (GNUNET_TIME_absolute_get_remaining (cp->migration_blocked).rel_value > 0)
1036 return GNUNET_YES; /* peer has requested no migration! */
1039 GNUNET_PEER_resolve (cp->pid,
1041 repl = MIGRATION_LIST_SIZE;
1042 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1044 if (mb->target_list[i] == 0)
1046 mb->target_list[i] = cp->pid;
1047 GNUNET_PEER_change_rc (mb->target_list[i], 1);
1048 repl = MIGRATION_LIST_SIZE;
1051 GNUNET_PEER_resolve (mb->target_list[i],
1053 if ( (repl == MIGRATION_LIST_SIZE) &&
1054 is_closer (&mb->query,
1059 worstpid = otherpid;
1061 else if ( (repl != MIGRATION_LIST_SIZE) &&
1062 (is_closer (&mb->query,
1067 worstpid = otherpid;
1070 if (repl != MIGRATION_LIST_SIZE)
1072 GNUNET_PEER_change_rc (mb->target_list[repl], -1);
1073 mb->target_list[repl] = cp->pid;
1074 GNUNET_PEER_change_rc (mb->target_list[repl], 1);
1078 /* consider scheduling transmission to cp for content migration */
1079 if (cp->cth != NULL)
1085 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1087 if (cp->pid == pos->target_list[i])
1092 msize = GNUNET_MIN (msize,
1100 return GNUNET_YES; /* no content available */
1102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1103 "Trying to migrate at least %u bytes to peer `%s'\n",
1107 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
1109 GNUNET_SCHEDULER_cancel (sched, cp->delayed_transmission_request_task);
1110 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
1113 = GNUNET_CORE_notify_transmit_ready (core,
1114 0, GNUNET_TIME_UNIT_FOREVER_REL,
1115 (const struct GNUNET_PeerIdentity*) key,
1116 msize + sizeof (struct PutMessage),
1124 * Task that is run periodically to obtain blocks for content
1128 * @param tc scheduler context (also unused)
1131 gather_migration_blocks (void *cls,
1132 const struct GNUNET_SCHEDULER_TaskContext *tc);
1138 * Task that is run periodically to obtain blocks for DHT PUTs.
1140 * @param cls type of blocks to gather
1141 * @param tc scheduler context (unused)
1144 gather_dht_put_blocks (void *cls,
1145 const struct GNUNET_SCHEDULER_TaskContext *tc);
1149 * If the migration task is not currently running, consider
1150 * (re)scheduling it with the appropriate delay.
1153 consider_migration_gathering ()
1155 struct GNUNET_TIME_Relative delay;
1161 if (mig_task != GNUNET_SCHEDULER_NO_TASK)
1163 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
1165 delay = GNUNET_TIME_relative_divide (delay,
1166 MAX_MIGRATION_QUEUE);
1167 delay = GNUNET_TIME_relative_max (delay,
1168 min_migration_delay);
1169 mig_task = GNUNET_SCHEDULER_add_delayed (sched,
1171 &gather_migration_blocks,
1177 * If the DHT PUT gathering task is not currently running, consider
1178 * (re)scheduling it with the appropriate delay.
1181 consider_dht_put_gathering (void *cls)
1183 struct GNUNET_TIME_Relative delay;
1189 if (dht_task != GNUNET_SCHEDULER_NO_TASK)
1191 if (zero_anonymity_count_estimate > 0)
1193 delay = GNUNET_TIME_relative_divide (GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY,
1194 zero_anonymity_count_estimate);
1195 delay = GNUNET_TIME_relative_min (delay,
1200 /* if we have NO zero-anonymity content yet, wait 5 minutes for some to
1201 (hopefully) appear */
1202 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5);
1204 dht_task = GNUNET_SCHEDULER_add_delayed (sched,
1206 &gather_dht_put_blocks,
1212 * Process content offered for migration.
1214 * @param cls closure
1215 * @param key key for the content
1216 * @param size number of bytes in data
1217 * @param data content stored
1218 * @param type type of the content
1219 * @param priority priority of the content
1220 * @param anonymity anonymity-level for the content
1221 * @param expiration expiration time for the content
1222 * @param uid unique identifier for the datum;
1223 * maybe 0 if no unique identifier is available
1226 process_migration_content (void *cls,
1227 const GNUNET_HashCode * key,
1230 enum GNUNET_BLOCK_Type type,
1233 struct GNUNET_TIME_Absolute
1234 expiration, uint64_t uid)
1236 struct MigrationReadyBlock *mb;
1241 if (mig_size < MAX_MIGRATION_QUEUE)
1242 consider_migration_gathering ();
1245 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1248 GNUNET_FS_handle_on_demand_block (key, size, data,
1249 type, priority, anonymity,
1251 &process_migration_content,
1254 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1260 "Retrieved block `%s' of type %u for migration\n",
1264 mb = GNUNET_malloc (sizeof (struct MigrationReadyBlock) + size);
1266 mb->expiration = expiration;
1269 memcpy (&mb[1], data, size);
1270 GNUNET_CONTAINER_DLL_insert_after (mig_head,
1275 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1276 &consider_migration,
1278 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1283 * Function called upon completion of the DHT PUT operation.
1286 dht_put_continuation (void *cls,
1287 const struct GNUNET_SCHEDULER_TaskContext *tc)
1289 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1294 * Store content in DHT.
1296 * @param cls closure
1297 * @param key key for the content
1298 * @param size number of bytes in data
1299 * @param data content stored
1300 * @param type type of the content
1301 * @param priority priority of the content
1302 * @param anonymity anonymity-level for the content
1303 * @param expiration expiration time for the content
1304 * @param uid unique identifier for the datum;
1305 * maybe 0 if no unique identifier is available
1308 process_dht_put_content (void *cls,
1309 const GNUNET_HashCode * key,
1312 enum GNUNET_BLOCK_Type type,
1315 struct GNUNET_TIME_Absolute
1316 expiration, uint64_t uid)
1318 static unsigned int counter;
1319 static GNUNET_HashCode last_vhash;
1320 static GNUNET_HashCode vhash;
1325 consider_dht_put_gathering (cls);
1328 /* slightly funky code to estimate the total number of values with zero
1329 anonymity from the maximum observed length of a monotonically increasing
1330 sequence of hashes over the contents */
1331 GNUNET_CRYPTO_hash (data, size, &vhash);
1332 if (GNUNET_CRYPTO_hash_cmp (&vhash, &last_vhash) <= 0)
1334 if (zero_anonymity_count_estimate > 0)
1335 zero_anonymity_count_estimate /= 2;
1341 if (zero_anonymity_count_estimate < (1 << counter))
1342 zero_anonymity_count_estimate = (1 << counter);
1344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1345 "Retrieved block `%s' of type %u for DHT PUT\n",
1349 GNUNET_DHT_put (dht_handle,
1356 GNUNET_TIME_UNIT_FOREVER_REL,
1357 &dht_put_continuation,
1363 * Task that is run periodically to obtain blocks for content
1367 * @param tc scheduler context (also unused)
1370 gather_migration_blocks (void *cls,
1371 const struct GNUNET_SCHEDULER_TaskContext *tc)
1373 mig_task = GNUNET_SCHEDULER_NO_TASK;
1376 mig_qe = GNUNET_DATASTORE_get_random (dsh, 0, UINT_MAX,
1377 GNUNET_TIME_UNIT_FOREVER_REL,
1378 &process_migration_content, NULL);
1379 GNUNET_assert (mig_qe != NULL);
1385 * Task that is run periodically to obtain blocks for DHT PUTs.
1387 * @param cls type of blocks to gather
1388 * @param tc scheduler context (unused)
1391 gather_dht_put_blocks (void *cls,
1392 const struct GNUNET_SCHEDULER_TaskContext *tc)
1394 dht_task = GNUNET_SCHEDULER_NO_TASK;
1397 if (dht_put_type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
1398 dht_put_type = GNUNET_BLOCK_TYPE_FS_KBLOCK;
1399 dht_qe = GNUNET_DATASTORE_get_zero_anonymity (dsh, 0, UINT_MAX,
1400 GNUNET_TIME_UNIT_FOREVER_REL,
1402 &process_dht_put_content, NULL);
1403 GNUNET_assert (dht_qe != NULL);
1409 * We're done with a particular message list entry.
1410 * Free all associated resources.
1412 * @param pml entry to destroy
1415 destroy_pending_message_list_entry (struct PendingMessageList *pml)
1417 GNUNET_CONTAINER_DLL_remove (pml->req->pending_head,
1418 pml->req->pending_tail,
1420 GNUNET_CONTAINER_DLL_remove (pml->target->pending_messages_head,
1421 pml->target->pending_messages_tail,
1423 pml->target->pending_requests--;
1424 GNUNET_free (pml->pm);
1430 * Destroy the given pending message (and call the respective
1433 * @param pm message to destroy
1434 * @param tpid id of peer that the message was delivered to, or 0 for none
1437 destroy_pending_message (struct PendingMessage *pm,
1438 GNUNET_PEER_Id tpid)
1440 struct PendingMessageList *pml = pm->pml;
1441 TransmissionContinuation cont;
1445 cont_cls = pm->cont_cls;
1448 GNUNET_assert (pml->pm == pm);
1449 GNUNET_assert ( (tpid == 0) || (tpid == pml->target->pid) );
1450 destroy_pending_message_list_entry (pml);
1457 cont (cont_cls, tpid);
1462 * We're done processing a particular request.
1463 * Free all associated resources.
1465 * @param pr request to destroy
1468 destroy_pending_request (struct PendingRequest *pr)
1470 struct GNUNET_PeerIdentity pid;
1473 if (pr->hnode != NULL)
1475 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration_heap,
1479 if (NULL == pr->client_request_list)
1481 GNUNET_STATISTICS_update (stats,
1482 gettext_noop ("# P2P searches active"),
1488 GNUNET_STATISTICS_update (stats,
1489 gettext_noop ("# client searches active"),
1494 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
1498 GNUNET_LOAD_update (rt_entry_lifetime,
1499 GNUNET_TIME_absolute_get_duration (pr->start_time).rel_value);
1503 GNUNET_DATASTORE_cancel (pr->qe);
1506 if (pr->dht_get != NULL)
1508 GNUNET_DHT_get_stop (pr->dht_get);
1511 if (pr->client_request_list != NULL)
1513 GNUNET_CONTAINER_DLL_remove (pr->client_request_list->client_list->rl_head,
1514 pr->client_request_list->client_list->rl_tail,
1515 pr->client_request_list);
1516 GNUNET_free (pr->client_request_list);
1517 pr->client_request_list = NULL;
1521 GNUNET_PEER_resolve (pr->cp->pid,
1523 (void) GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1530 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1533 if (pr->irc != NULL)
1535 GNUNET_CORE_peer_change_preference_cancel (pr->irc);
1538 if (pr->replies_seen != NULL)
1540 GNUNET_free (pr->replies_seen);
1541 pr->replies_seen = NULL;
1543 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
1545 GNUNET_SCHEDULER_cancel (sched,
1547 pr->task = GNUNET_SCHEDULER_NO_TASK;
1549 while (NULL != pr->pending_head)
1550 destroy_pending_message_list_entry (pr->pending_head);
1551 GNUNET_PEER_change_rc (pr->target_pid, -1);
1552 if (pr->used_targets != NULL)
1554 for (i=0;i<pr->used_targets_off;i++)
1555 GNUNET_PEER_change_rc (pr->used_targets[i].pid, -1);
1556 GNUNET_free (pr->used_targets);
1557 pr->used_targets_off = 0;
1558 pr->used_targets_size = 0;
1559 pr->used_targets = NULL;
1566 * Method called whenever a given peer connects.
1568 * @param cls closure, not used
1569 * @param peer peer identity this notification is about
1570 * @param latency reported latency of the connection with 'other'
1571 * @param distance reported distance (DV) to 'other'
1574 peer_connect_handler (void *cls,
1576 GNUNET_PeerIdentity * peer,
1577 struct GNUNET_TIME_Relative latency,
1580 struct ConnectedPeer *cp;
1581 struct MigrationReadyBlock *pos;
1585 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1592 cp = GNUNET_malloc (sizeof (struct ConnectedPeer));
1593 cp->transmission_delay = GNUNET_LOAD_value_init (latency);
1594 cp->pid = GNUNET_PEER_intern (peer);
1596 fn = get_trust_filename (peer);
1597 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
1598 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
1599 cp->disk_trust = cp->trust = ntohl (trust);
1602 GNUNET_break (GNUNET_OK ==
1603 GNUNET_CONTAINER_multihashmap_put (connected_peers,
1606 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1611 (void) consider_migration (pos, &peer->hashPubKey, cp);
1618 * Method called whenever a given peer has a status change.
1620 * @param cls closure
1621 * @param peer peer identity this notification is about
1622 * @param latency reported latency of the connection with 'other'
1623 * @param distance reported distance (DV) to 'other'
1624 * @param bandwidth_in available amount of inbound bandwidth
1625 * @param bandwidth_out available amount of outbound bandwidth
1626 * @param timeout absolute time when this peer will time out
1627 * unless we see some further activity from it
1630 peer_status_handler (void *cls,
1632 GNUNET_PeerIdentity * peer,
1633 struct GNUNET_TIME_Relative latency,
1635 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1636 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1637 struct GNUNET_TIME_Absolute timeout)
1639 struct ConnectedPeer *cp;
1641 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1648 GNUNET_LOAD_value_set_decline (cp->transmission_delay,
1655 * Increase the host credit by a value.
1657 * @param host which peer to change the trust value on
1658 * @param value is the int value by which the
1659 * host credit is to be increased or decreased
1660 * @returns the actual change in trust (positive or negative)
1663 change_host_trust (struct ConnectedPeer *host, int value)
1667 GNUNET_assert (host != NULL);
1670 if (host->trust + value < host->trust)
1672 value = UINT32_MAX - host->trust;
1673 host->trust = UINT32_MAX;
1676 host->trust += value;
1680 if (host->trust < -value)
1682 value = -host->trust;
1686 host->trust += value;
1693 * Write host-trust information to a file - flush the buffer entry!
1696 flush_trust (void *cls,
1697 const GNUNET_HashCode *key,
1700 struct ConnectedPeer *host = value;
1703 struct GNUNET_PeerIdentity pid;
1705 if (host->trust == host->disk_trust)
1706 return GNUNET_OK; /* unchanged */
1707 GNUNET_PEER_resolve (host->pid,
1709 fn = get_trust_filename (&pid);
1710 if (host->trust == 0)
1712 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1713 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1714 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1718 trust = htonl (host->trust);
1719 if (sizeof(uint32_t) == GNUNET_DISK_fn_write (fn, &trust,
1721 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
1722 | GNUNET_DISK_PERM_GROUP_READ | GNUNET_DISK_PERM_OTHER_READ))
1723 host->disk_trust = host->trust;
1730 * Call this method periodically to scan data/hosts for new hosts.
1733 cron_flush_trust (void *cls,
1734 const struct GNUNET_SCHEDULER_TaskContext *tc)
1737 if (NULL == connected_peers)
1739 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1744 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1746 GNUNET_SCHEDULER_add_delayed (tc->sched,
1747 TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1752 * Free (each) request made by the peer.
1754 * @param cls closure, points to peer that the request belongs to
1755 * @param key current key code
1756 * @param value value in the hash map
1757 * @return GNUNET_YES (we should continue to iterate)
1760 destroy_request (void *cls,
1761 const GNUNET_HashCode * key,
1764 const struct GNUNET_PeerIdentity * peer = cls;
1765 struct PendingRequest *pr = value;
1767 GNUNET_break (GNUNET_YES ==
1768 GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1771 destroy_pending_request (pr);
1777 * Method called whenever a peer disconnects.
1779 * @param cls closure, not used
1780 * @param peer peer identity this notification is about
1783 peer_disconnect_handler (void *cls,
1785 GNUNET_PeerIdentity * peer)
1787 struct ConnectedPeer *cp;
1788 struct PendingMessage *pm;
1790 struct MigrationReadyBlock *pos;
1791 struct MigrationReadyBlock *next;
1793 GNUNET_CONTAINER_multihashmap_get_multiple (peer_request_map,
1797 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1801 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1803 if (NULL != cp->last_client_replies[i])
1805 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1806 cp->last_client_replies[i] = NULL;
1809 GNUNET_break (GNUNET_YES ==
1810 GNUNET_CONTAINER_multihashmap_remove (connected_peers,
1813 /* remove this peer from migration considerations; schedule
1816 while (NULL != (pos = next))
1819 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1821 if (pos->target_list[i] == cp->pid)
1823 GNUNET_PEER_change_rc (pos->target_list[i], -1);
1824 pos->target_list[i] = 0;
1827 if (pos->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers))
1829 delete_migration_block (pos);
1830 consider_migration_gathering ();
1833 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1834 &consider_migration,
1837 GNUNET_PEER_change_rc (cp->pid, -1);
1838 GNUNET_PEER_decrement_rcs (cp->last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1839 if (NULL != cp->cth)
1841 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1844 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
1846 GNUNET_SCHEDULER_cancel (sched, cp->delayed_transmission_request_task);
1847 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
1849 while (NULL != (pm = cp->pending_messages_head))
1850 destroy_pending_message (pm, 0 /* delivery failed */);
1851 GNUNET_LOAD_value_free (cp->transmission_delay);
1852 GNUNET_break (0 == cp->pending_requests);
1858 * Iterator over hash map entries that removes all occurences
1859 * of the given 'client' from the 'last_client_replies' of the
1860 * given connected peer.
1862 * @param cls closure, the 'struct GNUNET_SERVER_Client*' to remove
1863 * @param key current key code (unused)
1864 * @param value value in the hash map (the 'struct ConnectedPeer*' to change)
1865 * @return GNUNET_YES (we should continue to iterate)
1868 remove_client_from_last_client_replies (void *cls,
1869 const GNUNET_HashCode * key,
1872 struct GNUNET_SERVER_Client *client = cls;
1873 struct ConnectedPeer *cp = value;
1876 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1878 if (cp->last_client_replies[i] == client)
1880 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1881 cp->last_client_replies[i] = NULL;
1889 * A client disconnected. Remove all of its pending queries.
1891 * @param cls closure, NULL
1892 * @param client identification of the client
1895 handle_client_disconnect (void *cls,
1896 struct GNUNET_SERVER_Client
1899 struct ClientList *pos;
1900 struct ClientList *prev;
1901 struct ClientRequestList *rcl;
1902 struct ClientResponseMessage *creply;
1908 while ( (NULL != pos) &&
1909 (pos->client != client) )
1915 return; /* no requests pending for this client */
1916 while (NULL != (rcl = pos->rl_head))
1918 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1919 "Destroying pending request `%s' on disconnect\n",
1920 GNUNET_h2s (&rcl->req->query));
1921 destroy_pending_request (rcl->req);
1924 client_list = pos->next;
1926 prev->next = pos->next;
1927 if (pos->th != NULL)
1929 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
1932 while (NULL != (creply = pos->res_head))
1934 GNUNET_CONTAINER_DLL_remove (pos->res_head,
1937 GNUNET_free (creply);
1939 GNUNET_SERVER_client_drop (pos->client);
1941 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1942 &remove_client_from_last_client_replies,
1948 * Iterator to free peer entries.
1950 * @param cls closure, unused
1951 * @param key current key code
1952 * @param value value in the hash map (peer entry)
1953 * @return GNUNET_YES (we should continue to iterate)
1956 clean_peer (void *cls,
1957 const GNUNET_HashCode * key,
1960 peer_disconnect_handler (NULL, (const struct GNUNET_PeerIdentity*) key);
1966 * Task run during shutdown.
1972 shutdown_task (void *cls,
1973 const struct GNUNET_SCHEDULER_TaskContext *tc)
1977 GNUNET_DATASTORE_cancel (mig_qe);
1982 GNUNET_DATASTORE_cancel (dht_qe);
1985 if (GNUNET_SCHEDULER_NO_TASK != mig_task)
1987 GNUNET_SCHEDULER_cancel (sched, mig_task);
1988 mig_task = GNUNET_SCHEDULER_NO_TASK;
1990 if (GNUNET_SCHEDULER_NO_TASK != dht_task)
1992 GNUNET_SCHEDULER_cancel (sched, dht_task);
1993 dht_task = GNUNET_SCHEDULER_NO_TASK;
1995 while (client_list != NULL)
1996 handle_client_disconnect (NULL,
1997 client_list->client);
1998 cron_flush_trust (NULL, NULL);
1999 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
2002 GNUNET_break (0 == GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap));
2003 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
2004 requests_by_expiration_heap = 0;
2005 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
2006 connected_peers = NULL;
2007 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (query_request_map));
2008 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
2009 query_request_map = NULL;
2010 GNUNET_LOAD_value_free (rt_entry_lifetime);
2011 rt_entry_lifetime = NULL;
2012 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (peer_request_map));
2013 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
2014 peer_request_map = NULL;
2015 GNUNET_assert (NULL != core);
2016 GNUNET_CORE_disconnect (core);
2020 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
2025 GNUNET_DATASTORE_disconnect (dsh,
2029 while (mig_head != NULL)
2030 delete_migration_block (mig_head);
2031 GNUNET_assert (0 == mig_size);
2032 GNUNET_DHT_disconnect (dht_handle);
2034 GNUNET_LOAD_value_free (datastore_get_load);
2035 datastore_get_load = NULL;
2036 GNUNET_LOAD_value_free (datastore_put_load);
2037 datastore_put_load = NULL;
2038 GNUNET_BLOCK_context_destroy (block_ctx);
2040 GNUNET_CONFIGURATION_destroy (block_cfg);
2044 GNUNET_free_non_null (trustDirectory);
2045 trustDirectory = NULL;
2049 /* ******************* Utility functions ******************** */
2053 * We've had to delay a request for transmission to core, but now
2054 * we should be ready. Run it.
2056 * @param cls the 'struct ConnectedPeer' for which a request was delayed
2057 * @param tc task context (unused)
2060 delayed_transmission_request (void *cls,
2061 const struct GNUNET_SCHEDULER_TaskContext *tc)
2063 struct ConnectedPeer *cp = cls;
2064 struct GNUNET_PeerIdentity pid;
2065 struct PendingMessage *pm;
2067 pm = cp->pending_messages_head;
2068 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
2069 GNUNET_assert (cp->cth == NULL);
2072 GNUNET_PEER_resolve (cp->pid,
2074 cp->last_transmission_request_start = GNUNET_TIME_absolute_get ();
2075 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
2077 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2086 * Transmit messages by copying it to the target buffer
2087 * "buf". "buf" will be NULL and "size" zero if the socket was closed
2088 * for writing in the meantime. In that case, do nothing
2089 * (the disconnect or shutdown handler will take care of the rest).
2090 * If we were able to transmit messages and there are still more
2091 * pending, ask core again for further calls to this function.
2093 * @param cls closure, pointer to the 'struct ConnectedPeer*'
2094 * @param size number of bytes available in buf
2095 * @param buf where the callee should write the message
2096 * @return number of bytes written to buf
2099 transmit_to_peer (void *cls,
2100 size_t size, void *buf)
2102 struct ConnectedPeer *cp = cls;
2104 struct PendingMessage *pm;
2105 struct PendingMessage *next_pm;
2106 struct GNUNET_TIME_Absolute now;
2107 struct GNUNET_TIME_Relative min_delay;
2108 struct MigrationReadyBlock *mb;
2109 struct MigrationReadyBlock *next;
2110 struct PutMessage migm;
2113 struct GNUNET_PeerIdentity pid;
2119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2120 "Dropping message, core too busy.\n");
2122 GNUNET_LOAD_update (cp->transmission_delay,
2126 GNUNET_LOAD_update (cp->transmission_delay,
2127 GNUNET_TIME_absolute_get_duration (cp->last_transmission_request_start).rel_value);
2128 now = GNUNET_TIME_absolute_get ();
2130 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
2131 next_pm = cp->pending_messages_head;
2132 while ( (NULL != (pm = next_pm) ) &&
2133 (pm->msize <= size) )
2136 if (pm->delay_until.abs_value > now.abs_value)
2138 min_delay = GNUNET_TIME_relative_min (min_delay,
2139 GNUNET_TIME_absolute_get_remaining (pm->delay_until));
2142 memcpy (&cbuf[msize], &pm[1], pm->msize);
2145 if (NULL == pm->pml)
2147 GNUNET_CONTAINER_DLL_remove (cp->pending_messages_head,
2148 cp->pending_messages_tail,
2150 cp->pending_requests--;
2152 destroy_pending_message (pm, cp->pid);
2155 min_delay = GNUNET_TIME_UNIT_ZERO;
2156 if (NULL != cp->pending_messages_head)
2158 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == cp->delayed_transmission_request_task);
2159 cp->delayed_transmission_request_task
2160 = GNUNET_SCHEDULER_add_delayed (sched,
2162 &delayed_transmission_request,
2167 GNUNET_PEER_resolve (cp->pid,
2170 while (NULL != (mb = next))
2173 for (i=0;i<MIGRATION_LIST_SIZE;i++)
2175 if ( (cp->pid == mb->target_list[i]) &&
2176 (mb->size + sizeof (migm) <= size) )
2178 GNUNET_PEER_change_rc (mb->target_list[i], -1);
2179 mb->target_list[i] = 0;
2181 memset (&migm, 0, sizeof (migm));
2182 migm.header.size = htons (sizeof (migm) + mb->size);
2183 migm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2184 migm.type = htonl (mb->type);
2185 migm.expiration = GNUNET_TIME_absolute_hton (mb->expiration);
2186 memcpy (&cbuf[msize], &migm, sizeof (migm));
2187 msize += sizeof (migm);
2188 size -= sizeof (migm);
2189 memcpy (&cbuf[msize], &mb[1], mb->size);
2193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2194 "Pushing migration block `%s' (%u bytes) to `%s'\n",
2195 GNUNET_h2s (&mb->query),
2196 (unsigned int) mb->size,
2204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2205 "Migration block `%s' (%u bytes) is not on migration list for peer `%s'\n",
2206 GNUNET_h2s (&mb->query),
2207 (unsigned int) mb->size,
2212 if ( (mb->used_targets >= MIGRATION_TARGET_COUNT) ||
2213 (mb->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers)) )
2215 delete_migration_block (mb);
2216 consider_migration_gathering ();
2219 consider_migration (NULL,
2224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2225 "Transmitting %u bytes to peer with PID %u\n",
2226 (unsigned int) msize,
2227 (unsigned int) cp->pid);
2234 * Add a message to the set of pending messages for the given peer.
2236 * @param cp peer to send message to
2237 * @param pm message to queue
2238 * @param pr request on which behalf this message is being queued
2241 add_to_pending_messages_for_peer (struct ConnectedPeer *cp,
2242 struct PendingMessage *pm,
2243 struct PendingRequest *pr)
2245 struct PendingMessage *pos;
2246 struct PendingMessageList *pml;
2247 struct GNUNET_PeerIdentity pid;
2249 GNUNET_assert (pm->next == NULL);
2250 GNUNET_assert (pm->pml == NULL);
2253 pml = GNUNET_malloc (sizeof (struct PendingMessageList));
2258 GNUNET_CONTAINER_DLL_insert (pr->pending_head,
2262 pos = cp->pending_messages_head;
2263 while ( (pos != NULL) &&
2264 (pm->priority < pos->priority) )
2266 GNUNET_CONTAINER_DLL_insert_after (cp->pending_messages_head,
2267 cp->pending_messages_tail,
2270 cp->pending_requests++;
2271 if (cp->pending_requests > MAX_QUEUE_PER_PEER)
2273 GNUNET_STATISTICS_update (stats,
2274 gettext_noop ("# P2P searches discarded (queue length bound)"),
2277 destroy_pending_message (cp->pending_messages_tail, 0);
2279 GNUNET_PEER_resolve (cp->pid, &pid);
2280 if (NULL != cp->cth)
2282 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
2285 if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
2287 GNUNET_SCHEDULER_cancel (sched, cp->delayed_transmission_request_task);
2288 cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
2290 /* need to schedule transmission */
2291 cp->last_transmission_request_start = GNUNET_TIME_absolute_get ();
2292 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
2293 cp->pending_messages_head->priority,
2296 cp->pending_messages_head->msize,
2299 if (cp->cth == NULL)
2302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2303 "Failed to schedule transmission with core!\n");
2305 GNUNET_STATISTICS_update (stats,
2306 gettext_noop ("# CORE transmission failures"),
2314 * Test if the DATABASE (GET) load on this peer is too high
2315 * to even consider processing the query at
2318 * @return GNUNET_YES if the load is too high to do anything (load high)
2319 * GNUNET_NO to process normally (load normal)
2320 * GNUNET_SYSERR to process for free (load low)
2323 test_get_load_too_high (uint32_t priority)
2327 ld = GNUNET_LOAD_get_load (datastore_get_load);
2329 return GNUNET_SYSERR;
2339 * Test if the DATABASE (PUT) load on this peer is too high
2340 * to even consider processing the query at
2343 * @return GNUNET_YES if the load is too high to do anything (load high)
2344 * GNUNET_NO to process normally (load normal or low)
2347 test_put_load_too_high (uint32_t priority)
2351 if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
2352 return GNUNET_NO; /* very fast */
2353 ld = GNUNET_LOAD_get_load (datastore_put_load);
2354 if (ld < 2.0 * (1 + priority))
2356 GNUNET_STATISTICS_update (stats,
2357 gettext_noop ("# storage requests dropped due to high load"),
2364 /* ******************* Pending Request Refresh Task ******************** */
2369 * We use a random delay to make the timing of requests less
2370 * predictable. This function returns such a random delay. We add a base
2371 * delay of MAX_CORK_DELAY (1s).
2373 * FIXME: make schedule dependent on the specifics of the request?
2374 * Or bandwidth and number of connected peers and load?
2376 * @return random delay to use for some request, between 1s and 1000+TTL_DECREMENT ms
2378 static struct GNUNET_TIME_Relative
2379 get_processing_delay ()
2382 GNUNET_TIME_relative_add (GNUNET_CONSTANTS_MAX_CORK_DELAY,
2383 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
2384 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2390 * We're processing a GET request from another peer and have decided
2391 * to forward it to other peers. This function is called periodically
2392 * and should forward the request to other peers until we have all
2393 * possible replies. If we have transmitted the *only* reply to
2394 * the initiator we should destroy the pending request. If we have
2395 * many replies in the queue to the initiator, we should delay sending
2396 * out more queries until the reply queue has shrunk some.
2398 * @param cls our "struct ProcessGetContext *"
2402 forward_request_task (void *cls,
2403 const struct GNUNET_SCHEDULER_TaskContext *tc);
2407 * Function called after we either failed or succeeded
2408 * at transmitting a query to a peer.
2410 * @param cls the requests "struct PendingRequest*"
2411 * @param tpid ID of receiving peer, 0 on transmission error
2414 transmit_query_continuation (void *cls,
2415 GNUNET_PEER_Id tpid)
2417 struct PendingRequest *pr = cls;
2420 GNUNET_STATISTICS_update (stats,
2421 gettext_noop ("# queries scheduled for forwarding"),
2427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2428 "Transmission of request failed, will try again later.\n");
2430 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2431 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2432 get_processing_delay (),
2433 &forward_request_task,
2438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2439 "Transmitted query `%s'\n",
2440 GNUNET_h2s (&pr->query));
2442 GNUNET_STATISTICS_update (stats,
2443 gettext_noop ("# queries forwarded"),
2446 for (i=0;i<pr->used_targets_off;i++)
2447 if (pr->used_targets[i].pid == tpid)
2448 break; /* found match! */
2449 if (i == pr->used_targets_off)
2451 /* need to create new entry */
2452 if (pr->used_targets_off == pr->used_targets_size)
2453 GNUNET_array_grow (pr->used_targets,
2454 pr->used_targets_size,
2455 pr->used_targets_size * 2 + 2);
2456 GNUNET_PEER_change_rc (tpid, 1);
2457 pr->used_targets[pr->used_targets_off].pid = tpid;
2458 pr->used_targets[pr->used_targets_off].num_requests = 0;
2459 i = pr->used_targets_off++;
2461 pr->used_targets[i].last_request_time = GNUNET_TIME_absolute_get ();
2462 pr->used_targets[i].num_requests++;
2463 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2464 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2465 get_processing_delay (),
2466 &forward_request_task,
2472 * How many bytes should a bloomfilter be if we have already seen
2473 * entry_count responses? Note that BLOOMFILTER_K gives us the number
2474 * of bits set per entry. Furthermore, we should not re-size the
2475 * filter too often (to keep it cheap).
2477 * Since other peers will also add entries but not resize the filter,
2478 * we should generally pick a slightly larger size than what the
2479 * strict math would suggest.
2481 * @return must be a power of two and smaller or equal to 2^15.
2484 compute_bloomfilter_size (unsigned int entry_count)
2487 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
2488 uint16_t max = 1 << 15;
2490 if (entry_count > max)
2493 while ((size < max) && (size < ideal))
2502 * Recalculate our bloom filter for filtering replies. This function
2503 * will create a new bloom filter from scratch, so it should only be
2504 * called if we have no bloomfilter at all (and hence can create a
2505 * fresh one of minimal size without problems) OR if our peer is the
2506 * initiator (in which case we may resize to larger than mimimum size).
2508 * @param pr request for which the BF is to be recomputed
2511 refresh_bloomfilter (struct PendingRequest *pr)
2515 GNUNET_HashCode mhash;
2517 nsize = compute_bloomfilter_size (pr->replies_seen_off);
2518 if (nsize == pr->bf_size)
2519 return; /* size not changed */
2521 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
2522 pr->bf_size = nsize;
2523 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1);
2524 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
2527 for (i=0;i<pr->replies_seen_off;i++)
2529 GNUNET_BLOCK_mingle_hash (&pr->replies_seen[i],
2532 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
2538 * Function called after we've tried to reserve a certain amount of
2539 * bandwidth for a reply. Check if we succeeded and if so send our
2542 * @param cls the requests "struct PendingRequest*"
2543 * @param peer identifies the peer
2544 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
2545 * @param bpm_out set to the current bandwidth limit (sending) for this peer
2546 * @param amount set to the amount that was actually reserved or unreserved
2547 * @param preference current traffic preference for the given peer
2550 target_reservation_cb (void *cls,
2552 GNUNET_PeerIdentity * peer,
2553 struct GNUNET_BANDWIDTH_Value32NBO bpm_in,
2554 struct GNUNET_BANDWIDTH_Value32NBO bpm_out,
2556 uint64_t preference)
2558 struct PendingRequest *pr = cls;
2559 struct ConnectedPeer *cp;
2560 struct PendingMessage *pm;
2561 struct GetMessage *gm;
2562 GNUNET_HashCode *ext;
2573 /* error in communication with core, try again later */
2574 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2575 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2576 get_processing_delay (),
2577 &forward_request_task,
2581 /* (3) transmit, update ttl/priority */
2582 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2586 /* Peer must have just left */
2588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2589 "Selected peer disconnected!\n");
2591 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2592 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2593 get_processing_delay (),
2594 &forward_request_task,
2598 no_route = GNUNET_NO;
2604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2605 "Failed to reserve bandwidth for reply (got %d/%u bytes only)!\n",
2609 GNUNET_STATISTICS_update (stats,
2610 gettext_noop ("# reply bandwidth reservation requests failed"),
2613 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2614 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2615 get_processing_delay (),
2616 &forward_request_task,
2618 return; /* this target round failed */
2620 no_route = GNUNET_YES;
2623 GNUNET_STATISTICS_update (stats,
2624 gettext_noop ("# queries scheduled for forwarding"),
2627 for (i=0;i<pr->used_targets_off;i++)
2628 if (pr->used_targets[i].pid == cp->pid)
2630 GNUNET_STATISTICS_update (stats,
2631 gettext_noop ("# queries retransmitted to same target"),
2637 /* build message and insert message into priority queue */
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2640 "Forwarding request `%s' to `%4s'!\n",
2641 GNUNET_h2s (&pr->query),
2646 if (GNUNET_YES == no_route)
2648 bm |= GET_MESSAGE_BIT_RETURN_TO;
2651 if (pr->namespace != NULL)
2653 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
2656 if (pr->target_pid != 0)
2658 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
2661 msize = sizeof (struct GetMessage) + pr->bf_size + k * sizeof(GNUNET_HashCode);
2662 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2663 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
2665 gm = (struct GetMessage*) &pm[1];
2666 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
2667 gm->header.size = htons (msize);
2668 gm->type = htonl (pr->type);
2669 pr->remaining_priority /= 2;
2670 gm->priority = htonl (pr->remaining_priority);
2671 gm->ttl = htonl (pr->ttl);
2672 gm->filter_mutator = htonl(pr->mingle);
2673 gm->hash_bitmap = htonl (bm);
2674 gm->query = pr->query;
2675 ext = (GNUNET_HashCode*) &gm[1];
2677 if (GNUNET_YES == no_route)
2678 GNUNET_PEER_resolve (pr->cp->pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
2679 if (pr->namespace != NULL)
2680 memcpy (&ext[k++], pr->namespace, sizeof (GNUNET_HashCode));
2681 if (pr->target_pid != 0)
2682 GNUNET_PEER_resolve (pr->target_pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
2683 bfdata = (char *) &ext[k];
2685 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
2688 pm->cont = &transmit_query_continuation;
2690 cp->last_request_times[(cp->last_request_times_off++) % MAX_QUEUE_PER_PEER] = GNUNET_TIME_absolute_get ();
2691 add_to_pending_messages_for_peer (cp, pm, pr);
2696 * Closure used for "target_peer_select_cb".
2698 struct PeerSelectionContext
2701 * The request for which we are selecting
2704 struct PendingRequest *pr;
2707 * Current "prime" target.
2709 struct GNUNET_PeerIdentity target;
2712 * How much do we like this target?
2714 double target_score;
2720 * Function called for each connected peer to determine
2721 * which one(s) would make good targets for forwarding.
2723 * @param cls closure (struct PeerSelectionContext)
2724 * @param key current key code (peer identity)
2725 * @param value value in the hash map (struct ConnectedPeer)
2726 * @return GNUNET_YES if we should continue to
2731 target_peer_select_cb (void *cls,
2732 const GNUNET_HashCode * key,
2735 struct PeerSelectionContext *psc = cls;
2736 struct ConnectedPeer *cp = value;
2737 struct PendingRequest *pr = psc->pr;
2738 struct GNUNET_TIME_Relative delay;
2743 /* 1) check that this peer is not the initiator */
2747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2748 "Skipping initiator in forwarding selection\n");
2750 return GNUNET_YES; /* skip */
2753 /* 2) check if we have already (recently) forwarded to this peer */
2754 /* 2a) this particular request */
2756 for (i=0;i<pr->used_targets_off;i++)
2757 if (pr->used_targets[i].pid == cp->pid)
2759 pc = pr->used_targets[i].num_requests;
2760 GNUNET_assert (pc > 0);
2761 if (0 != GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2762 RETRY_PROBABILITY_INV * pc))
2765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2766 "NOT re-trying query that was previously transmitted %u times\n",
2769 return GNUNET_YES; /* skip */
2776 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2777 "Re-trying query that was previously transmitted %u times to this peer\n",
2781 /* 2b) many other requests to this peer */
2782 delay = GNUNET_TIME_absolute_get_duration (cp->last_request_times[cp->last_request_times_off % MAX_QUEUE_PER_PEER]);
2783 if (delay.rel_value <= cp->avg_delay.rel_value)
2786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2787 "NOT sending query since we send %u others to this peer in the last %llums\n",
2789 cp->avg_delay.rel_value);
2791 return GNUNET_YES; /* skip */
2794 /* 3) calculate how much we'd like to forward to this peer,
2795 starting with a random value that is strong enough
2796 to at least give any peer a chance sometimes
2797 (compared to the other factors that come later) */
2798 /* 3a) count successful (recent) routes from cp for same source */
2801 score = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2802 P2P_SUCCESS_LIST_SIZE);
2803 for (i=0;i<P2P_SUCCESS_LIST_SIZE;i++)
2804 if (cp->last_p2p_replies[i] == pr->cp->pid)
2805 score += 1.0; /* likely successful based on hot path */
2809 score = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2810 CS2P_SUCCESS_LIST_SIZE);
2811 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
2812 if (cp->last_client_replies[i] == pr->client_request_list->client_list->client)
2813 score += 1.0; /* likely successful based on hot path */
2815 /* 3b) include latency */
2816 if (cp->avg_delay.rel_value < 4 * TTL_DECREMENT)
2817 score += 1.0; /* likely fast based on latency */
2818 /* 3c) include priorities */
2819 if (cp->avg_priority <= pr->remaining_priority / 2.0)
2820 score += 1.0; /* likely successful based on priorities */
2821 /* 3d) penalize for queue size */
2822 score -= (2.0 * cp->pending_requests / (double) MAX_QUEUE_PER_PEER);
2823 /* 3e) include peer proximity */
2824 score -= (2.0 * (GNUNET_CRYPTO_hash_distance_u32 (key,
2825 &pr->query)) / (double) UINT32_MAX);
2826 /* 4) super-bonus for being the known target */
2827 if (pr->target_pid == cp->pid)
2829 /* store best-fit in closure */
2831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2832 "Peer `%s' gets score %f for forwarding query, max is %f\n",
2837 score++; /* avoid zero */
2838 if (score > psc->target_score)
2840 psc->target_score = score;
2841 psc->target.hashPubKey = *key;
2848 * The priority level imposes a bound on the maximum
2849 * value for the ttl that can be requested.
2851 * @param ttl_in requested ttl
2852 * @param prio given priority
2853 * @return ttl_in if ttl_in is below the limit,
2854 * otherwise the ttl-limit for the given priority
2857 bound_ttl (int32_t ttl_in, uint32_t prio)
2859 unsigned long long allowed;
2863 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
2864 if (ttl_in > allowed)
2866 if (allowed >= (1 << 30))
2875 * Iterator called on each result obtained for a DHT
2876 * operation that expects a reply
2878 * @param cls closure
2879 * @param exp when will this value expire
2880 * @param key key of the result
2881 * @param get_path NULL-terminated array of pointers
2882 * to the peers on reverse GET path (or NULL if not recorded)
2883 * @param put_path NULL-terminated array of pointers
2884 * to the peers on the PUT path (or NULL if not recorded)
2885 * @param type type of the result
2886 * @param size number of bytes in data
2887 * @param data pointer to the result data
2890 process_dht_reply (void *cls,
2891 struct GNUNET_TIME_Absolute exp,
2892 const GNUNET_HashCode * key,
2893 const struct GNUNET_PeerIdentity * const *get_path,
2894 const struct GNUNET_PeerIdentity * const *put_path,
2895 enum GNUNET_BLOCK_Type type,
2901 * We're processing a GET request and have decided
2902 * to forward it to other peers. This function is called periodically
2903 * and should forward the request to other peers until we have all
2904 * possible replies. If we have transmitted the *only* reply to
2905 * the initiator we should destroy the pending request. If we have
2906 * many replies in the queue to the initiator, we should delay sending
2907 * out more queries until the reply queue has shrunk some.
2909 * @param cls our "struct ProcessGetContext *"
2913 forward_request_task (void *cls,
2914 const struct GNUNET_SCHEDULER_TaskContext *tc)
2916 struct PendingRequest *pr = cls;
2917 struct PeerSelectionContext psc;
2918 struct ConnectedPeer *cp;
2919 struct GNUNET_TIME_Relative delay;
2921 pr->task = GNUNET_SCHEDULER_NO_TASK;
2922 if (pr->irc != NULL)
2925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2926 "Forwarding of query `%s' not attempted due to pending local lookup!\n",
2927 GNUNET_h2s (&pr->query));
2929 return; /* already pending */
2931 if (GNUNET_YES == pr->local_only)
2932 return; /* configured to not do P2P search */
2934 if ( (0 == pr->anonymity_level) &&
2935 (GNUNET_YES != pr->forward_only) &&
2936 (pr->type != GNUNET_BLOCK_TYPE_FS_DBLOCK) &&
2937 (pr->type != GNUNET_BLOCK_TYPE_FS_IBLOCK) )
2939 pr->dht_get = GNUNET_DHT_get_start (dht_handle,
2940 GNUNET_TIME_UNIT_FOREVER_REL,
2947 (pr->namespace != NULL) ? sizeof (GNUNET_HashCode) : 0,
2951 /* (1) select target */
2953 psc.target_score = -DBL_MAX;
2954 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
2955 &target_peer_select_cb,
2957 if (psc.target_score == -DBL_MAX)
2959 delay = get_processing_delay ();
2961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2962 "No peer selected for forwarding of query `%s', will try again in %llu ms!\n",
2963 GNUNET_h2s (&pr->query),
2966 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2968 &forward_request_task,
2970 return; /* nobody selected */
2972 /* (3) update TTL/priority */
2973 if (pr->client_request_list != NULL)
2975 /* FIXME: use better algorithm!? */
2976 if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2979 /* bound priority we use by priorities we see from other peers
2980 rounded up (must round up so that we can see non-zero
2981 priorities, but round up as little as possible to make it
2982 plausible that we forwarded another peers request) */
2983 if (pr->priority > current_priorities + 1.0)
2984 pr->priority = (uint32_t) current_priorities + 1.0;
2985 pr->ttl = bound_ttl (pr->ttl + TTL_DECREMENT * 2,
2988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2989 "Trying query `%s' with priority %u and TTL %d.\n",
2990 GNUNET_h2s (&pr->query),
2996 /* (3) reserve reply bandwidth */
2997 if (GNUNET_NO == pr->forward_only)
2999 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3000 &psc.target.hashPubKey);
3001 GNUNET_assert (NULL != cp);
3002 pr->irc = GNUNET_CORE_peer_change_preference (sched, cfg,
3004 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
3005 GNUNET_BANDWIDTH_value_init (UINT32_MAX),
3008 &target_reservation_cb,
3010 cp->inc_preference = 0;
3014 /* force forwarding */
3015 static struct GNUNET_BANDWIDTH_Value32NBO zerobw;
3016 target_reservation_cb (pr, &psc.target,
3017 zerobw, zerobw, 0, 0.0);
3022 /* **************************** P2P PUT Handling ************************ */
3026 * Function called after we either failed or succeeded
3027 * at transmitting a reply to a peer.
3029 * @param cls the requests "struct PendingRequest*"
3030 * @param tpid ID of receiving peer, 0 on transmission error
3033 transmit_reply_continuation (void *cls,
3034 GNUNET_PEER_Id tpid)
3036 struct PendingRequest *pr = cls;
3040 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
3041 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
3042 /* only one reply expected, done with the request! */
3043 destroy_pending_request (pr);
3045 case GNUNET_BLOCK_TYPE_ANY:
3046 case GNUNET_BLOCK_TYPE_FS_KBLOCK:
3047 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
3057 * Transmit the given message by copying it to the target buffer
3058 * "buf". "buf" will be NULL and "size" zero if the socket was closed
3059 * for writing in the meantime. In that case, do nothing
3060 * (the disconnect or shutdown handler will take care of the rest).
3061 * If we were able to transmit messages and there are still more
3062 * pending, ask core again for further calls to this function.
3064 * @param cls closure, pointer to the 'struct ClientList*'
3065 * @param size number of bytes available in buf
3066 * @param buf where the callee should write the message
3067 * @return number of bytes written to buf
3070 transmit_to_client (void *cls,
3071 size_t size, void *buf)
3073 struct ClientList *cl = cls;
3075 struct ClientResponseMessage *creply;
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3083 "Not sending reply, client communication problem.\n");
3088 while ( (NULL != (creply = cl->res_head) ) &&
3089 (creply->msize <= size) )
3091 memcpy (&cbuf[msize], &creply[1], creply->msize);
3092 msize += creply->msize;
3093 size -= creply->msize;
3094 GNUNET_CONTAINER_DLL_remove (cl->res_head,
3097 GNUNET_free (creply);
3100 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
3102 GNUNET_TIME_UNIT_FOREVER_REL,
3103 &transmit_to_client,
3106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3107 "Transmitted %u bytes to client\n",
3108 (unsigned int) msize);
3115 * Closure for "process_reply" function.
3117 struct ProcessReplyClosure
3120 * The data for the reply.
3125 * Who gave us this reply? NULL for local host (or DHT)
3127 struct ConnectedPeer *sender;
3130 * When the reply expires.
3132 struct GNUNET_TIME_Absolute expiration;
3140 * Type of the block.
3142 enum GNUNET_BLOCK_Type type;
3145 * How much was this reply worth to us?
3150 * Evaluation result (returned).
3152 enum GNUNET_BLOCK_EvaluationResult eval;
3155 * Did we finish processing the associated request?
3160 * Did we find a matching request?
3167 * We have received a reply; handle it!
3169 * @param cls response (struct ProcessReplyClosure)
3170 * @param key our query
3171 * @param value value in the hash map (info about the query)
3172 * @return GNUNET_YES (we should continue to iterate)
3175 process_reply (void *cls,
3176 const GNUNET_HashCode * key,
3179 struct ProcessReplyClosure *prq = cls;
3180 struct PendingRequest *pr = value;
3181 struct PendingMessage *reply;
3182 struct ClientResponseMessage *creply;
3183 struct ClientList *cl;
3184 struct PutMessage *pm;
3185 struct ConnectedPeer *cp;
3186 struct GNUNET_TIME_Relative cur_delay;
3188 struct GNUNET_TIME_Relative art_delay;
3194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3195 "Matched result (type %u) for query `%s' with pending request\n",
3196 (unsigned int) prq->type,
3199 GNUNET_STATISTICS_update (stats,
3200 gettext_noop ("# replies received and matched"),
3203 if (prq->sender != NULL)
3205 for (i=0;i<pr->used_targets_off;i++)
3206 if (pr->used_targets[i].pid == prq->sender->pid)
3208 if (i < pr->used_targets_off)
3210 cur_delay = GNUNET_TIME_absolute_get_duration (pr->used_targets[i].last_request_time);
3211 prq->sender->avg_delay.rel_value
3212 = (prq->sender->avg_delay.rel_value *
3213 (RUNAVG_DELAY_N - 1) + cur_delay.rel_value) / RUNAVG_DELAY_N;
3214 prq->sender->avg_priority
3215 = (prq->sender->avg_priority *
3216 (RUNAVG_DELAY_N - 1) + pr->priority) / (double) RUNAVG_DELAY_N;
3220 GNUNET_PEER_change_rc (prq->sender->last_p2p_replies
3221 [prq->sender->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE],
3223 GNUNET_PEER_change_rc (pr->cp->pid, 1);
3224 prq->sender->last_p2p_replies
3225 [(prq->sender->last_p2p_replies_woff++) % P2P_SUCCESS_LIST_SIZE]
3230 if (NULL != prq->sender->last_client_replies
3231 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE])
3232 GNUNET_SERVER_client_drop (prq->sender->last_client_replies
3233 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE]);
3234 prq->sender->last_client_replies
3235 [(prq->sender->last_client_replies_woff++) % CS2P_SUCCESS_LIST_SIZE]
3236 = pr->client_request_list->client_list->client;
3237 GNUNET_SERVER_client_keep (pr->client_request_list->client_list->client);
3240 prq->eval = GNUNET_BLOCK_evaluate (block_ctx,
3245 pr->namespace, (pr->namespace != NULL) ? sizeof (GNUNET_HashCode) : 0,
3250 case GNUNET_BLOCK_EVALUATION_OK_MORE:
3252 case GNUNET_BLOCK_EVALUATION_OK_LAST:
3253 while (NULL != pr->pending_head)
3254 destroy_pending_message_list_entry (pr->pending_head);
3257 if (pr->client_request_list != NULL)
3258 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
3260 GNUNET_DATASTORE_cancel (pr->qe);
3263 pr->do_remove = GNUNET_YES;
3264 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
3266 GNUNET_SCHEDULER_cancel (sched,
3268 pr->task = GNUNET_SCHEDULER_NO_TASK;
3270 GNUNET_break (GNUNET_YES ==
3271 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
3274 GNUNET_LOAD_update (rt_entry_lifetime,
3275 GNUNET_TIME_absolute_get_duration (pr->start_time).rel_value);
3277 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
3278 GNUNET_STATISTICS_update (stats,
3279 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
3283 /* GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3284 "Duplicate response `%s', discarding.\n",
3285 GNUNET_h2s (&mhash));*/
3287 return GNUNET_YES; /* duplicate */
3288 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
3289 return GNUNET_YES; /* wrong namespace */
3290 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
3293 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
3296 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
3297 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3298 _("Unsupported block type %u\n"),
3302 if (pr->client_request_list != NULL)
3304 if (pr->replies_seen_size == pr->replies_seen_off)
3305 GNUNET_array_grow (pr->replies_seen,
3306 pr->replies_seen_size,
3307 pr->replies_seen_size * 2 + 4);
3308 GNUNET_CRYPTO_hash (prq->data,
3310 &pr->replies_seen[pr->replies_seen_off++]);
3311 refresh_bloomfilter (pr);
3313 if (NULL == prq->sender)
3316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3317 "Found result for query `%s' in local datastore\n",
3320 GNUNET_STATISTICS_update (stats,
3321 gettext_noop ("# results found locally"),
3325 prq->priority += pr->remaining_priority;
3326 pr->remaining_priority = 0;
3327 pr->results_found++;
3328 prq->request_found = GNUNET_YES;
3329 if (NULL != pr->client_request_list)
3331 GNUNET_STATISTICS_update (stats,
3332 gettext_noop ("# replies received for local clients"),
3335 cl = pr->client_request_list->client_list;
3336 msize = sizeof (struct PutMessage) + prq->size;
3337 creply = GNUNET_malloc (msize + sizeof (struct ClientResponseMessage));
3338 creply->msize = msize;
3339 creply->client_list = cl;
3340 GNUNET_CONTAINER_DLL_insert_after (cl->res_head,
3344 pm = (struct PutMessage*) &creply[1];
3345 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
3346 pm->header.size = htons (msize);
3347 pm->type = htonl (prq->type);
3348 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
3349 memcpy (&pm[1], prq->data, prq->size);
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3354 "Transmitting result for query `%s' to client\n",
3357 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
3359 GNUNET_TIME_UNIT_FOREVER_REL,
3360 &transmit_to_client,
3363 GNUNET_break (cl->th != NULL);
3366 prq->finished = GNUNET_YES;
3367 destroy_pending_request (pr);
3374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3375 "Transmitting result for query `%s' to other peer (PID=%u)\n",
3377 (unsigned int) cp->pid);
3379 GNUNET_STATISTICS_update (stats,
3380 gettext_noop ("# replies received for other peers"),
3383 msize = sizeof (struct PutMessage) + prq->size;
3384 reply = GNUNET_malloc (msize + sizeof (struct PendingMessage));
3385 reply->cont = &transmit_reply_continuation;
3386 reply->cont_cls = pr;
3388 art_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
3389 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3392 = GNUNET_TIME_relative_to_absolute (art_delay);
3393 GNUNET_STATISTICS_update (stats,
3394 gettext_noop ("cummulative artificial delay introduced (ms)"),
3395 art_delay.abs_value,
3398 reply->msize = msize;
3399 reply->priority = UINT32_MAX; /* send replies first! */
3400 pm = (struct PutMessage*) &reply[1];
3401 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
3402 pm->header.size = htons (msize);
3403 pm->type = htonl (prq->type);
3404 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
3405 memcpy (&pm[1], prq->data, prq->size);
3406 add_to_pending_messages_for_peer (cp, reply, pr);
3413 * Iterator called on each result obtained for a DHT
3414 * operation that expects a reply
3416 * @param cls closure
3417 * @param exp when will this value expire
3418 * @param key key of the result
3419 * @param get_path NULL-terminated array of pointers
3420 * to the peers on reverse GET path (or NULL if not recorded)
3421 * @param put_path NULL-terminated array of pointers
3422 * to the peers on the PUT path (or NULL if not recorded)
3423 * @param type type of the result
3424 * @param size number of bytes in data
3425 * @param data pointer to the result data
3428 process_dht_reply (void *cls,
3429 struct GNUNET_TIME_Absolute exp,
3430 const GNUNET_HashCode * key,
3431 const struct GNUNET_PeerIdentity * const *get_path,
3432 const struct GNUNET_PeerIdentity * const *put_path,
3433 enum GNUNET_BLOCK_Type type,
3437 struct PendingRequest *pr = cls;
3438 struct ProcessReplyClosure prq;
3440 memset (&prq, 0, sizeof (prq));
3442 prq.expiration = exp;
3445 process_reply (&prq, key, pr);
3451 * Continuation called to notify client about result of the
3454 * @param cls closure
3455 * @param success GNUNET_SYSERR on failure
3456 * @param msg NULL on success, otherwise an error message
3459 put_migration_continuation (void *cls,
3463 struct GNUNET_TIME_Absolute *start = cls;
3464 struct GNUNET_TIME_Relative delay;
3466 delay = GNUNET_TIME_absolute_get_duration (*start);
3467 GNUNET_free (start);
3468 GNUNET_LOAD_update (datastore_put_load,
3470 if (GNUNET_OK == success)
3472 GNUNET_STATISTICS_update (stats,
3473 gettext_noop ("# datastore 'put' failures"),
3480 * Handle P2P "PUT" message.
3482 * @param cls closure, always NULL
3483 * @param other the other peer involved (sender or receiver, NULL
3484 * for loopback messages where we are both sender and receiver)
3485 * @param message the actual message
3486 * @param latency reported latency of the connection with 'other'
3487 * @param distance reported distance (DV) to 'other'
3488 * @return GNUNET_OK to keep the connection open,
3489 * GNUNET_SYSERR to close it (signal serious error)
3492 handle_p2p_put (void *cls,
3493 const struct GNUNET_PeerIdentity *other,
3494 const struct GNUNET_MessageHeader *message,
3495 struct GNUNET_TIME_Relative latency,
3498 const struct PutMessage *put;
3501 enum GNUNET_BLOCK_Type type;
3502 struct GNUNET_TIME_Absolute expiration;
3503 GNUNET_HashCode query;
3504 struct ProcessReplyClosure prq;
3505 struct GNUNET_TIME_Absolute *start;
3506 struct GNUNET_TIME_Relative block_time;
3508 struct ConnectedPeer *cp;
3509 struct PendingMessage *pm;
3510 struct MigrationStopMessage *msm;
3512 msize = ntohs (message->size);
3513 if (msize < sizeof (struct PutMessage))
3516 return GNUNET_SYSERR;
3518 put = (const struct PutMessage*) message;
3519 dsize = msize - sizeof (struct PutMessage);
3520 type = ntohl (put->type);
3521 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
3523 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
3524 return GNUNET_SYSERR;
3526 GNUNET_BLOCK_get_key (block_ctx,
3532 GNUNET_break_op (0);
3533 return GNUNET_SYSERR;
3536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3537 "Received result for query `%s' from peer `%4s'\n",
3538 GNUNET_h2s (&query),
3539 GNUNET_i2s (other));
3541 GNUNET_STATISTICS_update (stats,
3542 gettext_noop ("# replies received (overall)"),
3545 /* now, lookup 'query' */
3546 prq.data = (const void*) &put[1];
3548 prq.sender = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3549 &other->hashPubKey);
3554 prq.expiration = expiration;
3556 prq.finished = GNUNET_NO;
3557 prq.request_found = GNUNET_NO;
3558 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3562 if (prq.sender != NULL)
3564 prq.sender->inc_preference += CONTENT_BANDWIDTH_VALUE + 1000 * prq.priority;
3565 prq.sender->trust += prq.priority;
3567 if ( (GNUNET_YES == active_migration) &&
3568 (GNUNET_NO == test_put_load_too_high (prq.priority)) )
3571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3572 "Replicating result for query `%s' with priority %u\n",
3573 GNUNET_h2s (&query),
3576 start = GNUNET_malloc (sizeof (struct GNUNET_TIME_Absolute));
3577 *start = GNUNET_TIME_absolute_get ();
3578 GNUNET_DATASTORE_put (dsh,
3579 0, &query, dsize, &put[1],
3580 type, prq.priority, 1 /* anonymity */,
3582 1 + prq.priority, MAX_DATASTORE_QUEUE,
3583 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
3584 &put_migration_continuation,
3587 putl = GNUNET_LOAD_get_load (datastore_put_load);
3588 if ( (GNUNET_NO == prq.request_found) &&
3589 ( (GNUNET_YES != active_migration) ||
3590 (putl > 2.5 * (1 + prq.priority)) ) )
3592 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3593 &other->hashPubKey);
3594 if (GNUNET_TIME_absolute_get_duration (cp->last_migration_block).rel_value < 5000)
3595 return GNUNET_OK; /* already blocked */
3596 /* We're too busy; send MigrationStop message! */
3597 if (GNUNET_YES != active_migration)
3598 putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
3599 block_time = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
3600 5000 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3601 (unsigned int) (60000 * putl * putl)));
3603 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
3604 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
3605 sizeof (struct MigrationStopMessage));
3606 pm->msize = sizeof (struct MigrationStopMessage);
3607 pm->priority = UINT32_MAX;
3608 msm = (struct MigrationStopMessage*) &pm[1];
3609 msm->header.size = htons (sizeof (struct MigrationStopMessage));
3610 msm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
3611 msm->duration = GNUNET_TIME_relative_hton (block_time);
3612 add_to_pending_messages_for_peer (cp,
3621 * Handle P2P "MIGRATION_STOP" message.
3623 * @param cls closure, always NULL
3624 * @param other the other peer involved (sender or receiver, NULL
3625 * for loopback messages where we are both sender and receiver)
3626 * @param message the actual message
3627 * @param latency reported latency of the connection with 'other'
3628 * @param distance reported distance (DV) to 'other'
3629 * @return GNUNET_OK to keep the connection open,
3630 * GNUNET_SYSERR to close it (signal serious error)
3633 handle_p2p_migration_stop (void *cls,
3634 const struct GNUNET_PeerIdentity *other,
3635 const struct GNUNET_MessageHeader *message,
3636 struct GNUNET_TIME_Relative latency,
3639 struct ConnectedPeer *cp;
3640 const struct MigrationStopMessage *msm;
3642 msm = (const struct MigrationStopMessage*) message;
3643 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3644 &other->hashPubKey);
3650 cp->migration_blocked = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (msm->duration));
3656 /* **************************** P2P GET Handling ************************ */
3660 * Closure for 'check_duplicate_request_{peer,client}'.
3662 struct CheckDuplicateRequestClosure
3665 * The new request we should check if it already exists.
3667 const struct PendingRequest *pr;
3670 * Existing request found by the checker, NULL if none.
3672 struct PendingRequest *have;
3677 * Iterator over entries in the 'query_request_map' that
3678 * tries to see if we have the same request pending from
3679 * the same client already.
3681 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
3682 * @param key current key code (query, ignored, must match)
3683 * @param value value in the hash map (a 'struct PendingRequest'
3684 * that already exists)
3685 * @return GNUNET_YES if we should continue to
3686 * iterate (no match yet)
3687 * GNUNET_NO if not (match found).
3690 check_duplicate_request_client (void *cls,
3691 const GNUNET_HashCode * key,
3694 struct CheckDuplicateRequestClosure *cdc = cls;
3695 struct PendingRequest *have = value;
3697 if (have->client_request_list == NULL)
3699 if ( (cdc->pr->client_request_list->client_list->client == have->client_request_list->client_list->client) &&
3710 * We're processing (local) results for a search request
3711 * from another peer. Pass applicable results to the
3712 * peer and if we are done either clean up (operation
3713 * complete) or forward to other peers (more results possible).
3715 * @param cls our closure (struct LocalGetContext)
3716 * @param key key for the content
3717 * @param size number of bytes in data
3718 * @param data content stored
3719 * @param type type of the content
3720 * @param priority priority of the content
3721 * @param anonymity anonymity-level for the content
3722 * @param expiration expiration time for the content
3723 * @param uid unique identifier for the datum;
3724 * maybe 0 if no unique identifier is available
3727 process_local_reply (void *cls,
3728 const GNUNET_HashCode * key,
3731 enum GNUNET_BLOCK_Type type,
3734 struct GNUNET_TIME_Absolute
3738 struct PendingRequest *pr = cls;
3739 struct ProcessReplyClosure prq;
3740 struct CheckDuplicateRequestClosure cdrc;
3741 GNUNET_HashCode query;
3742 unsigned int old_rf;
3747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3748 "Done processing local replies, forwarding request to other peers.\n");
3751 if (pr->client_request_list != NULL)
3753 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
3755 /* Figure out if this is a duplicate request and possibly
3756 merge 'struct PendingRequest' entries */
3759 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3761 &check_duplicate_request_client,
3763 if (cdrc.have != NULL)
3766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3767 "Received request for block `%s' twice from client, will only request once.\n",
3768 GNUNET_h2s (&pr->query));
3771 destroy_pending_request (pr);
3775 if (pr->local_only == GNUNET_YES)
3777 destroy_pending_request (pr);
3780 /* no more results */
3781 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
3782 pr->task = GNUNET_SCHEDULER_add_now (sched,
3783 &forward_request_task,
3788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3789 "New local response to `%s' of type %u.\n",
3793 if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
3796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3797 "Found ONDEMAND block, performing on-demand encoding\n");
3799 GNUNET_STATISTICS_update (stats,
3800 gettext_noop ("# on-demand blocks matched requests"),
3804 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
3805 anonymity, expiration, uid,
3806 &process_local_reply,
3810 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3814 old_rf = pr->results_found;
3815 memset (&prq, 0, sizeof (prq));
3817 prq.expiration = expiration;
3820 GNUNET_BLOCK_get_key (block_ctx,
3827 GNUNET_DATASTORE_remove (dsh,
3831 GNUNET_TIME_UNIT_FOREVER_REL,
3833 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3837 prq.priority = priority;
3838 prq.finished = GNUNET_NO;
3839 prq.request_found = GNUNET_NO;
3840 if ( (old_rf == 0) &&
3841 (pr->results_found == 0) )
3842 update_datastore_delays (pr->start_time);
3843 process_reply (&prq, key, pr);
3844 if (prq.finished == GNUNET_YES)
3847 return; /* done here */
3848 if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
3850 pr->local_only = GNUNET_YES; /* do not forward */
3851 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
3854 if ( (pr->client_request_list == NULL) &&
3855 ( (GNUNET_YES == test_get_load_too_high (0)) ||
3856 (pr->results_found > 5 + 2 * pr->priority) ) )
3859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3860 "Load too high, done with request\n");
3862 GNUNET_STATISTICS_update (stats,
3863 gettext_noop ("# processing result set cut short due to load"),
3866 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
3869 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
3874 * We've received a request with the specified priority. Bound it
3875 * according to how much we trust the given peer.
3877 * @param prio_in requested priority
3878 * @param cp the peer making the request
3879 * @return effective priority
3882 bound_priority (uint32_t prio_in,
3883 struct ConnectedPeer *cp)
3885 #define N ((double)128.0)
3890 ld = test_get_load_too_high (0);
3891 if (ld == GNUNET_SYSERR)
3893 GNUNET_STATISTICS_update (stats,
3894 gettext_noop ("# requests done for free (low load)"),
3897 return 0; /* excess resources */
3899 ret = change_host_trust (cp, prio_in);
3902 if (ret > current_priorities + N)
3903 rret = current_priorities + N;
3907 = (current_priorities * (N-1) + rret)/N;
3909 if ( (ld == GNUNET_YES) && (ret > 0) )
3911 /* try with charging */
3912 ld = test_get_load_too_high (ret);
3914 if (ld == GNUNET_YES)
3916 GNUNET_STATISTICS_update (stats,
3917 gettext_noop ("# request dropped, priority insufficient"),
3922 change_host_trust (cp, -ret);
3923 return -1; /* not enough resources */
3927 GNUNET_STATISTICS_update (stats,
3928 gettext_noop ("# requests done for a price (normal load)"),
3938 * Iterator over entries in the 'query_request_map' that
3939 * tries to see if we have the same request pending from
3940 * the same peer already.
3942 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
3943 * @param key current key code (query, ignored, must match)
3944 * @param value value in the hash map (a 'struct PendingRequest'
3945 * that already exists)
3946 * @return GNUNET_YES if we should continue to
3947 * iterate (no match yet)
3948 * GNUNET_NO if not (match found).
3951 check_duplicate_request_peer (void *cls,
3952 const GNUNET_HashCode * key,
3955 struct CheckDuplicateRequestClosure *cdc = cls;
3956 struct PendingRequest *have = value;
3958 if (cdc->pr->target_pid == have->target_pid)
3968 * Handle P2P "GET" request.
3970 * @param cls closure, always NULL
3971 * @param other the other peer involved (sender or receiver, NULL
3972 * for loopback messages where we are both sender and receiver)
3973 * @param message the actual message
3974 * @param latency reported latency of the connection with 'other'
3975 * @param distance reported distance (DV) to 'other'
3976 * @return GNUNET_OK to keep the connection open,
3977 * GNUNET_SYSERR to close it (signal serious error)
3980 handle_p2p_get (void *cls,
3981 const struct GNUNET_PeerIdentity *other,
3982 const struct GNUNET_MessageHeader *message,
3983 struct GNUNET_TIME_Relative latency,
3986 struct PendingRequest *pr;
3987 struct ConnectedPeer *cp;
3988 struct ConnectedPeer *cps;
3989 struct CheckDuplicateRequestClosure cdc;
3990 struct GNUNET_TIME_Relative timeout;
3992 const struct GetMessage *gm;
3994 const GNUNET_HashCode *opt;
3997 uint32_t ttl_decrement;
3999 enum GNUNET_BLOCK_Type type;
4002 msize = ntohs(message->size);
4003 if (msize < sizeof (struct GetMessage))
4005 GNUNET_break_op (0);
4006 return GNUNET_SYSERR;
4008 gm = (const struct GetMessage*) message;
4010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4011 "Received request for `%s'\n",
4012 GNUNET_h2s (&gm->query));
4014 type = ntohl (gm->type);
4015 bm = ntohl (gm->hash_bitmap);
4023 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
4025 GNUNET_break_op (0);
4026 return GNUNET_SYSERR;
4028 opt = (const GNUNET_HashCode*) &gm[1];
4029 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
4030 /* bfsize must be power of 2, check! */
4031 if (0 != ( (bfsize - 1) & bfsize))
4033 GNUNET_break_op (0);
4034 return GNUNET_SYSERR;
4036 bm = ntohl (gm->hash_bitmap);
4038 cps = GNUNET_CONTAINER_multihashmap_get (connected_peers,
4039 &other->hashPubKey);
4042 /* peer must have just disconnected */
4043 GNUNET_STATISTICS_update (stats,
4044 gettext_noop ("# requests dropped due to initiator not being connected"),
4047 return GNUNET_SYSERR;
4049 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
4050 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
4057 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
4058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4059 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
4060 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
4063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4064 "Failed to find peer `%4s' in connection set. Dropping query.\n",
4065 GNUNET_i2s (other));
4067 GNUNET_STATISTICS_update (stats,
4068 gettext_noop ("# requests dropped due to missing reverse route"),
4071 /* FIXME: try connect? */
4074 /* note that we can really only check load here since otherwise
4075 peers could find out that we are overloaded by not being
4076 disconnected after sending us a malformed query... */
4077 priority = bound_priority (ntohl (gm->priority), cps);
4081 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4082 "Dropping query from `%s', this peer is too busy.\n",
4083 GNUNET_i2s (other));
4088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4089 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
4090 GNUNET_h2s (&gm->query),
4091 (unsigned int) type,
4095 have_ns = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE));
4096 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
4097 (have_ns ? sizeof(GNUNET_HashCode) : 0));
4100 pr->namespace = (GNUNET_HashCode*) &pr[1];
4101 memcpy (&pr[1], &opt[bits++], sizeof (GNUNET_HashCode));
4103 if ( (GNUNET_LOAD_get_load (cp->transmission_delay) > 3 * (1 + priority)) ||
4104 (GNUNET_LOAD_get_average (cp->transmission_delay) >
4105 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 + GNUNET_LOAD_get_average (rt_entry_lifetime)) )
4107 /* don't have BW to send to peer, or would likely take longer than we have for it,
4108 so at best indirect the query */
4110 pr->forward_only = GNUNET_YES;
4113 pr->mingle = ntohl (gm->filter_mutator);
4114 if (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO))
4115 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &opt[bits++]);
4116 pr->anonymity_level = 1;
4117 pr->priority = (uint32_t) priority;
4118 pr->ttl = bound_ttl (ntohl (gm->ttl), pr->priority);
4119 pr->query = gm->query;
4120 /* decrement ttl (always) */
4121 ttl_decrement = 2 * TTL_DECREMENT +
4122 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
4124 if ( (pr->ttl < 0) &&
4125 (((int32_t)(pr->ttl - ttl_decrement)) > 0) )
4128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4129 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
4134 GNUNET_STATISTICS_update (stats,
4135 gettext_noop ("# requests dropped due TTL underflow"),
4138 /* integer underflow => drop (should be very rare)! */
4142 pr->ttl -= ttl_decrement;
4143 pr->start_time = GNUNET_TIME_absolute_get ();
4145 /* get bloom filter */
4148 pr->bf = GNUNET_CONTAINER_bloomfilter_init ((const char*) &opt[bits],
4151 pr->bf_size = bfsize;
4155 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
4157 &check_duplicate_request_peer,
4159 if (cdc.have != NULL)
4161 if (cdc.have->start_time.abs_value + cdc.have->ttl >=
4162 pr->start_time.abs_value + pr->ttl)
4164 /* existing request has higher TTL, drop new one! */
4165 cdc.have->priority += pr->priority;
4166 destroy_pending_request (pr);
4168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4169 "Have existing request with higher TTL, dropping new request.\n",
4170 GNUNET_i2s (other));
4172 GNUNET_STATISTICS_update (stats,
4173 gettext_noop ("# requests dropped due to higher-TTL request"),
4180 /* existing request has lower TTL, drop old one! */
4181 pr->priority += cdc.have->priority;
4182 /* Possible optimization: if we have applicable pending
4183 replies in 'cdc.have', we might want to move those over
4184 (this is a really rare special-case, so it is not clear
4185 that this would be worth it) */
4186 destroy_pending_request (cdc.have);
4187 /* keep processing 'pr'! */
4192 GNUNET_break (GNUNET_OK ==
4193 GNUNET_CONTAINER_multihashmap_put (query_request_map,
4196 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4197 GNUNET_break (GNUNET_OK ==
4198 GNUNET_CONTAINER_multihashmap_put (peer_request_map,
4201 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4203 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
4205 pr->start_time.abs_value + pr->ttl);
4207 GNUNET_STATISTICS_update (stats,
4208 gettext_noop ("# P2P searches received"),
4211 GNUNET_STATISTICS_update (stats,
4212 gettext_noop ("# P2P searches active"),
4216 /* calculate change in traffic preference */
4217 cps->inc_preference += pr->priority * 1000 + QUERY_BANDWIDTH_VALUE;
4218 /* process locally */
4219 if (type == GNUNET_BLOCK_TYPE_FS_DBLOCK)
4220 type = GNUNET_BLOCK_TYPE_ANY; /* to get on-demand as well */
4221 timeout = GNUNET_TIME_relative_multiply (BASIC_DATASTORE_REQUEST_DELAY,
4222 (pr->priority + 1));
4223 if (GNUNET_YES != pr->forward_only)
4226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4227 "Handing request for `%s' to datastore\n",
4228 GNUNET_h2s (&gm->query));
4230 pr->qe = GNUNET_DATASTORE_get (dsh,
4234 MAX_DATASTORE_QUEUE,
4236 &process_local_reply,
4240 GNUNET_STATISTICS_update (stats,
4241 gettext_noop ("# requests dropped by datastore (queue length limit)"),
4248 GNUNET_STATISTICS_update (stats,
4249 gettext_noop ("# requests forwarded due to high load"),
4254 /* Are multiple results possible (and did we look locally)? If so, start processing remotely now! */
4257 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
4258 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
4259 /* only one result, wait for datastore */
4260 if (GNUNET_YES != pr->forward_only)
4262 GNUNET_STATISTICS_update (stats,
4263 gettext_noop ("# requests not instantly forwarded (waiting for datastore)"),
4269 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
4270 pr->task = GNUNET_SCHEDULER_add_now (sched,
4271 &forward_request_task,
4275 /* make sure we don't track too many requests */
4276 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
4278 pr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
4279 GNUNET_assert (pr != NULL);
4280 destroy_pending_request (pr);
4286 /* **************************** CS GET Handling ************************ */
4290 * Handle START_SEARCH-message (search request from client).
4292 * @param cls closure
4293 * @param client identification of the client
4294 * @param message the actual message
4297 handle_start_search (void *cls,
4298 struct GNUNET_SERVER_Client *client,
4299 const struct GNUNET_MessageHeader *message)
4301 static GNUNET_HashCode all_zeros;
4302 const struct SearchMessage *sm;
4303 struct ClientList *cl;
4304 struct ClientRequestList *crl;
4305 struct PendingRequest *pr;
4308 enum GNUNET_BLOCK_Type type;
4310 msize = ntohs (message->size);
4311 if ( (msize < sizeof (struct SearchMessage)) ||
4312 (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
4315 GNUNET_SERVER_receive_done (client,
4319 GNUNET_STATISTICS_update (stats,
4320 gettext_noop ("# client searches received"),
4323 sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
4324 sm = (const struct SearchMessage*) message;
4325 type = ntohl (sm->type);
4327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4328 "Received request for `%s' of type %u from local client\n",
4329 GNUNET_h2s (&sm->query),
4330 (unsigned int) type);
4333 while ( (cl != NULL) &&
4334 (cl->client != client) )
4338 cl = GNUNET_malloc (sizeof (struct ClientList));
4339 cl->client = client;
4340 GNUNET_SERVER_client_keep (client);
4341 cl->next = client_list;
4344 /* detect duplicate KBLOCK requests */
4345 if ( (type == GNUNET_BLOCK_TYPE_FS_KBLOCK) ||
4346 (type == GNUNET_BLOCK_TYPE_FS_NBLOCK) ||
4347 (type == GNUNET_BLOCK_TYPE_ANY) )
4350 while ( (crl != NULL) &&
4351 ( (0 != memcmp (&crl->req->query,
4353 sizeof (GNUNET_HashCode))) ||
4354 (crl->req->type != type) ) )
4359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4360 "Have existing request, merging content-seen lists.\n");
4363 /* Duplicate request (used to send long list of
4364 known/blocked results); merge 'pr->replies_seen'
4365 and update bloom filter */
4366 GNUNET_array_grow (pr->replies_seen,
4367 pr->replies_seen_size,
4368 pr->replies_seen_off + sc);
4369 memcpy (&pr->replies_seen[pr->replies_seen_off],
4371 sc * sizeof (GNUNET_HashCode));
4372 pr->replies_seen_off += sc;
4373 refresh_bloomfilter (pr);
4374 GNUNET_STATISTICS_update (stats,
4375 gettext_noop ("# client searches updated (merged content seen list)"),
4378 GNUNET_SERVER_receive_done (client,
4383 GNUNET_STATISTICS_update (stats,
4384 gettext_noop ("# client searches active"),
4387 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
4388 ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) ? sizeof(GNUNET_HashCode) : 0));
4389 crl = GNUNET_malloc (sizeof (struct ClientRequestList));
4390 memset (crl, 0, sizeof (struct ClientRequestList));
4391 crl->client_list = cl;
4392 GNUNET_CONTAINER_DLL_insert (cl->rl_head,
4397 pr->client_request_list = crl;
4398 GNUNET_array_grow (pr->replies_seen,
4399 pr->replies_seen_size,
4401 memcpy (pr->replies_seen,
4403 sc * sizeof (GNUNET_HashCode));
4404 pr->replies_seen_off = sc;
4405 pr->anonymity_level = ntohl (sm->anonymity_level);
4406 pr->start_time = GNUNET_TIME_absolute_get ();
4407 refresh_bloomfilter (pr);
4408 pr->query = sm->query;
4409 if (0 == (1 & ntohl (sm->options)))
4410 pr->local_only = GNUNET_NO;
4412 pr->local_only = GNUNET_YES;
4415 case GNUNET_BLOCK_TYPE_FS_DBLOCK:
4416 case GNUNET_BLOCK_TYPE_FS_IBLOCK:
4417 if (0 != memcmp (&sm->target,
4419 sizeof (GNUNET_HashCode)))
4420 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &sm->target);
4422 case GNUNET_BLOCK_TYPE_FS_SBLOCK:
4423 pr->namespace = (GNUNET_HashCode*) &pr[1];
4424 memcpy (&pr[1], &sm->target, sizeof (GNUNET_HashCode));
4429 GNUNET_break (GNUNET_OK ==
4430 GNUNET_CONTAINER_multihashmap_put (query_request_map,
4433 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
4434 if (type == GNUNET_BLOCK_TYPE_FS_DBLOCK)
4435 type = GNUNET_BLOCK_TYPE_ANY; /* get on-demand blocks too! */
4436 pr->qe = GNUNET_DATASTORE_get (dsh,
4440 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
4441 &process_local_reply,
4446 /* **************************** Startup ************************ */
4449 * Process fs requests.
4451 * @param s scheduler to use
4452 * @param server the initialized server
4453 * @param c configuration to use
4456 main_init (struct GNUNET_SCHEDULER_Handle *s,
4457 struct GNUNET_SERVER_Handle *server,
4458 const struct GNUNET_CONFIGURATION_Handle *c)
4460 static const struct GNUNET_CORE_MessageHandler p2p_handlers[] =
4463 GNUNET_MESSAGE_TYPE_FS_GET, 0 },
4465 GNUNET_MESSAGE_TYPE_FS_PUT, 0 },
4466 { &handle_p2p_migration_stop,
4467 GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP,
4468 sizeof (struct MigrationStopMessage) },
4471 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4472 {&GNUNET_FS_handle_index_start, NULL,
4473 GNUNET_MESSAGE_TYPE_FS_INDEX_START, 0},
4474 {&GNUNET_FS_handle_index_list_get, NULL,
4475 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET, sizeof(struct GNUNET_MessageHeader) },
4476 {&GNUNET_FS_handle_unindex, NULL, GNUNET_MESSAGE_TYPE_FS_UNINDEX,
4477 sizeof (struct UnindexMessage) },
4478 {&handle_start_search, NULL, GNUNET_MESSAGE_TYPE_FS_START_SEARCH,
4482 unsigned long long enc = 128;
4486 stats = GNUNET_STATISTICS_create (sched, "fs", cfg);
4487 min_migration_delay = GNUNET_TIME_UNIT_SECONDS;
4489 GNUNET_CONFIGURATION_get_value_number (cfg,
4491 "MAX_PENDING_REQUESTS",
4492 &max_pending_requests)) ||
4494 GNUNET_CONFIGURATION_get_value_number (cfg,
4496 "EXPECTED_NEIGHBOUR_COUNT",
4499 GNUNET_CONFIGURATION_get_value_time (cfg,
4501 "MIN_MIGRATION_DELAY",
4502 &min_migration_delay)) )
4504 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4505 _("Configuration fails to specify certain parameters, assuming default values."));
4507 connected_peers = GNUNET_CONTAINER_multihashmap_create (enc);
4508 query_request_map = GNUNET_CONTAINER_multihashmap_create (max_pending_requests);
4509 rt_entry_lifetime = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_FOREVER_REL);
4510 peer_request_map = GNUNET_CONTAINER_multihashmap_create (enc);
4511 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
4512 core = GNUNET_CORE_connect (sched,
4514 GNUNET_TIME_UNIT_FOREVER_REL,
4517 &peer_connect_handler,
4518 &peer_disconnect_handler,
4519 &peer_status_handler,
4525 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4526 _("Failed to connect to `%s' service.\n"),
4528 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
4529 connected_peers = NULL;
4530 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
4531 query_request_map = NULL;
4532 GNUNET_LOAD_value_free (rt_entry_lifetime);
4533 rt_entry_lifetime = NULL;
4534 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
4535 requests_by_expiration_heap = NULL;
4536 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
4537 peer_request_map = NULL;
4540 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
4543 return GNUNET_SYSERR;
4545 /* FIXME: distinguish between sending and storing in options? */
4546 if (active_migration)
4548 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4549 _("Content migration is enabled, will start to gather data\n"));
4550 consider_migration_gathering ();
4552 consider_dht_put_gathering (NULL);
4553 GNUNET_SERVER_disconnect_notify (server,
4554 &handle_client_disconnect,
4556 GNUNET_assert (GNUNET_OK ==
4557 GNUNET_CONFIGURATION_get_value_filename (cfg,
4561 GNUNET_DISK_directory_create (trustDirectory);
4562 GNUNET_SCHEDULER_add_with_priority (sched,
4563 GNUNET_SCHEDULER_PRIORITY_HIGH,
4564 &cron_flush_trust, NULL);
4567 GNUNET_SERVER_add_handlers (server, handlers);
4568 GNUNET_SCHEDULER_add_delayed (sched,
4569 GNUNET_TIME_UNIT_FOREVER_REL,
4577 * Process fs requests.
4579 * @param cls closure
4580 * @param sched scheduler to use
4581 * @param server the initialized server
4582 * @param cfg configuration to use
4586 struct GNUNET_SCHEDULER_Handle *sched,
4587 struct GNUNET_SERVER_Handle *server,
4588 const struct GNUNET_CONFIGURATION_Handle *cfg)
4590 active_migration = GNUNET_CONFIGURATION_get_value_yesno (cfg,
4593 dsh = GNUNET_DATASTORE_connect (cfg,
4597 GNUNET_SCHEDULER_shutdown (sched);
4600 datastore_get_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
4601 datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
4602 block_cfg = GNUNET_CONFIGURATION_create ();
4603 GNUNET_CONFIGURATION_set_value_string (block_cfg,
4607 block_ctx = GNUNET_BLOCK_context_create (block_cfg);
4608 GNUNET_assert (NULL != block_ctx);
4609 dht_handle = GNUNET_DHT_connect (sched,
4612 if ( (GNUNET_OK != GNUNET_FS_indexing_init (sched, cfg, dsh)) ||
4613 (GNUNET_OK != main_init (sched, server, cfg)) )
4615 GNUNET_SCHEDULER_shutdown (sched);
4616 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
4618 GNUNET_DHT_disconnect (dht_handle);
4620 GNUNET_BLOCK_context_destroy (block_ctx);
4622 GNUNET_CONFIGURATION_destroy (block_cfg);
4624 GNUNET_LOAD_value_free (datastore_get_load);
4625 datastore_get_load = NULL;
4626 GNUNET_LOAD_value_free (datastore_put_load);
4627 datastore_put_load = NULL;
4634 * The main function for the fs service.
4636 * @param argc number of arguments from the command line
4637 * @param argv command line arguments
4638 * @return 0 ok, 1 on error
4641 main (int argc, char *const *argv)
4643 return (GNUNET_OK ==
4644 GNUNET_SERVICE_run (argc,
4647 GNUNET_SERVICE_OPTION_NONE,
4648 &run, NULL)) ? 0 : 1;
4651 /* end of gnunet-service-fs.c */