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22 * @file dht/gnunet-service-dht_datacache.h
23 * @brief GNUnet DHT service's datacache integration
24 * @author Christian Grothoff
25 * @author Nathan Evans
27 #ifndef GNUNET_SERVICE_DHT_DATACACHE_H
28 #define GNUNET_SERVICE_DHT_DATACACHE_H
30 #include "gnunet_util_lib.h"
31 #include "gnunet_block_lib.h"
32 #include "gnunet_dht_service.h"
35 * Handle a datum we've received from another peer. Cache if
38 * @param expiration when will the reply expire
39 * @param key the query this reply is for
40 * @param put_path_length number of peers in @a put_path
41 * @param put_path path the reply took on put
42 * @param get_path_length number of peers in @a get_path
43 * @param get_path path the reply took on get
44 * @param type type of the reply
45 * @param data_size number of bytes in @a data
46 * @param data application payload data
49 GDS_DATACACHE_handle_put (struct GNUNET_TIME_Absolute expiration,
50 const struct GNUNET_HashCode *key,
51 unsigned int put_path_length,
52 const struct GNUNET_PeerIdentity *put_path,
53 unsigned int get_path_length,
54 const struct GNUNET_PeerIdentity *get_path,
55 enum GNUNET_BLOCK_Type type,
61 * Handle a GET request we've received from another peer.
63 * @param trail_id trail where the reply needs to be send to
64 * @param options routing options (to be passed along)
65 * @param key the query
66 * @param type requested data type
67 * @param xquery extended query
68 * @param xquery_size number of bytes in @a xquery
69 * @param reply_bf where the reply bf is (to be) stored, possibly updated!, can be NULL
70 * @param reply_bf_mutator mutation value for @a reply_bf
71 * @return evaluation result for the local replies
73 * FIXME: also pass options, so we know to record paths or not...
75 enum GNUNET_BLOCK_EvaluationResult
76 GDS_DATACACHE_handle_get (const struct GNUNET_HashCode *trail_id,
77 enum GNUNET_DHT_RouteOption options,
78 const struct GNUNET_HashCode *key,
79 enum GNUNET_BLOCK_Type type,
82 struct GNUNET_CONTAINER_BloomFilter **reply_bf,
83 uint32_t reply_bf_mutator);
87 * Obtain a random key from the datacache.
88 * Used by Whanau for load-balancing.
90 * @param[out] key where to store the key of a random element,
91 * randomized by PRNG if datacache is empty
92 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the datacache is empty
95 GDS_DATACACHE_get_random_key (struct GNUNET_HashCode *key);
99 * Handle a request for data close to a key that we have received from
102 * @param trail_id trail where the reply needs to be send to
103 * @param key the location at which the peer is looking for data that is close
106 GDS_DATACACHE_get_successors (const struct GNUNET_HashCode *trail_id,
107 const struct GNUNET_HashCode *key);
111 * Initialize datacache subsystem.
114 GDS_DATACACHE_init (void);
118 * Shutdown datacache subsystem.
121 GDS_DATACACHE_done (void);