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- /*
- This file is part of GNUnet.
- Copyright (C) 2009, 2010, 2011 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file dht/gnunet-service-dht_datacache.h
- * @brief GNUnet DHT service's datacache integration
- * @author Christian Grothoff
- * @author Nathan Evans
- */
- #ifndef GNUNET_SERVICE_DHT_DATACACHE_H
- #define GNUNET_SERVICE_DHT_DATACACHE_H
- #include "gnunet_util_lib.h"
- #include "gnunet_block_lib.h"
- #include "gnunet_dht_service.h"
- /**
- * Handle a datum we've received from another peer. Cache if
- * possible.
- *
- * @param expiration when will the reply expire
- * @param key the query this reply is for
- * @param put_path_length number of peers in 'put_path'
- * @param put_path path the reply took on put
- * @param type type of the reply
- * @param data_size number of bytes in 'data'
- * @param data application payload data
- */
- void
- GDS_DATACACHE_handle_put (struct GNUNET_TIME_Absolute expiration,
- const struct GNUNET_HashCode *key,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- enum GNUNET_BLOCK_Type type,
- size_t data_size,
- const void *data);
- /**
- * Handle a result for a GET operation.
- *
- * @param cls closure
- * @param type type of the block
- * @param expiration_time when does the content expire
- * @param key key for the content
- * @param put_path_length number of entries in @a put_path
- * @param put_path peers the original PUT traversed (if tracked)
- * @param get_path_length number of entries in @a get_path
- * @param get_path peers this reply has traversed so far (if tracked)
- * @param data payload of the reply
- * @param data_size number of bytes in @a data
- */
- typedef void
- (*GDS_DATACACHE_GetCallback)(void *cls,
- enum GNUNET_BLOCK_Type type,
- struct GNUNET_TIME_Absolute expiration_time,
- const struct GNUNET_HashCode *key,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *get_path,
- const void *data,
- size_t data_size);
- /**
- * Handle a GET request we've received from another peer.
- *
- * @param key the query
- * @param type requested data type
- * @param xquery extended query
- * @param xquery_size number of bytes in xquery
- * @param bg block group to use for evaluation of replies
- * @param gc function to call on the results
- * @param gc_cls closure for @a gc
- * @return evaluation result for the local replies
- */
- enum GNUNET_BLOCK_EvaluationResult
- GDS_DATACACHE_handle_get (const struct GNUNET_HashCode *key,
- enum GNUNET_BLOCK_Type type,
- const void *xquery,
- size_t xquery_size,
- struct GNUNET_BLOCK_Group *bg,
- GDS_DATACACHE_GetCallback gc,
- void *gc_cls);
- /**
- * Obtain a random key from the datacache.
- * Used by Whanau for load-balancing.
- *
- * @param[out] key where to store the key of a random element,
- * randomized by PRNG if datacache is empty
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if the datacache is empty
- */
- int
- GDS_DATACACHE_get_random_key (struct GNUNET_HashCode *key);
- /**
- * Send the get result to requesting client.
- *
- * @param cls closure
- * @param options routing options (from GET request)
- * @param key key of the requested data.
- * @param type block type
- * @param put_path_length number of peers in @a put_path
- * @param put_path path taken to put the data at its stored location.
- * @param expiration when will this result expire?
- * @param data payload to store
- * @param data_size size of the @a data
- */
- typedef void
- (*GDS_DATACACHE_SuccessorCallback)(void *cls,
- enum GNUNET_DHT_RouteOption options,
- const struct GNUNET_HashCode *key,
- enum GNUNET_BLOCK_Type type,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- struct GNUNET_TIME_Absolute expiration,
- const void *data,
- size_t data_size);
- /**
- * Handle a request for data close to a key that we have received from
- * another peer.
- *
- * @param key the location at which the peer is looking for data that is close
- * @param cb function to call with the result
- * @param cb_cls closure for @a cb
- */
- void
- GDS_DATACACHE_get_successors (const struct GNUNET_HashCode *key,
- GDS_DATACACHE_SuccessorCallback cb,
- void *cb_cls);
- /**
- * Initialize datacache subsystem.
- */
- void
- GDS_DATACACHE_init (void);
- /**
- * Shutdown datacache subsystem.
- */
- void
- GDS_DATACACHE_done (void);
- #endif
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