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- /*
- This file is part of GNUnet.
- (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
- /**
- * @file dht/gnunet-service-dht_datacache.c
- * @brief GNUnet DHT service's datacache integration
- * @author Christian Grothoff
- * @author Nathan Evans
- */
- #include "platform.h"
- #include "gnunet_datacache_lib.h"
- #include "gnunet-service-xdht_clients.h"
- #include "gnunet-service-xdht_datacache.h"
- #include "gnunet-service-xdht_routing.h"
- #include "gnunet-service-xdht_neighbours.h"
- #include "gnunet-service-dht.h"
- #define LOG(kind,...) GNUNET_log_from (kind, "dht-dtcache",__VA_ARGS__)
- #define DEBUG(...) \
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
- /**
- * Handle to the datacache service (for inserting/retrieving data)
- */
- static struct GNUNET_DATACACHE_Handle *datacache;
- /**
- * 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)
- {
- int r;
-
- if (NULL == datacache)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("%s request received, but have no datacache!\n"), "PUT");
- return;
- }
- if (data_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
-
- /* Put size is actual data size plus struct overhead plus path length (if any) */
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# ITEMS stored in datacache"), 1,
- GNUNET_NO);
-
- struct GNUNET_PeerIdentity peer = GDS_NEIGHBOURS_get_my_id();
- DEBUG("DATACACHE_PUT KEY = %s, peer = %s\n",GNUNET_h2s(key),GNUNET_i2s(&peer));
- r = GNUNET_DATACACHE_put (datacache, key, data_size, data, type, expiration,
- put_path_length, put_path);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "DATACACHE PUT for key %s [%u] completed (%d) after %u hops\n",
- GNUNET_h2s (key), data_size, r, put_path_length);
- }
- /**
- * List of peers in the get path.
- */
- struct GetPath
- {
- /**
- * Pointer to next item in the list
- */
- struct GetPath *next;
- /**
- * Pointer to previous item in the list
- */
- struct GetPath *prev;
- /**
- * An element in the get path.
- */
- struct GNUNET_PeerIdentity peer;
- };
- /**
- * Context containing information about a GET request.
- */
- struct GetRequestContext
- {
- /**
- * extended query (see gnunet_block_lib.h).
- */
- const void *xquery;
- /**
- * Bloomfilter to filter out duplicate replies (updated)
- */
- struct GNUNET_CONTAINER_BloomFilter **reply_bf;
- /**
- * The key this request was about
- */
- struct GNUNET_HashCode key;
- /**
- * Number of bytes in xquery.
- */
- size_t xquery_size;
- /**
- * Mutator value for the reply_bf, see gnunet_block_lib.h
- */
- uint32_t reply_bf_mutator;
- /**
- * Total number of peers in get path.
- */
- unsigned int get_path_length;
- /**
- * Return value to give back.
- */
- enum GNUNET_BLOCK_EvaluationResult eval;
- /**
- * Peeer which has the data for the key.
- */
- struct GNUNET_PeerIdentity source_peer;
- /**
- * Next hop to forward the get result to.
- */
- struct GNUNET_PeerIdentity next_hop;
- /**
- * Head of get path.
- */
- struct GetPath *head;
- /**
- * Tail of get path.
- */
- struct GetPath *tail;
- /* get_path */
- };
- /**
- * Iterator for local get request results,
- *
- * @param cls closure for iterator, a DatacacheGetContext
- * @param exp when does this value expire?
- * @param key the key this data is stored under
- * @param size the size of the data identified by key
- * @param data the actual data
- * @param type the type of the data
- * @param put_path_length number of peers in 'put_path'
- * @param put_path path the reply took on put
- * @return GNUNET_OK to continue iteration, anything else
- * to stop iteration.
- */
- static int
- datacache_get_iterator (void *cls,
- const struct GNUNET_HashCode * key, size_t size,
- const char *data, enum GNUNET_BLOCK_Type type,
- struct GNUNET_TIME_Absolute exp,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path)
- {
- struct GetRequestContext *ctx = cls;
- enum GNUNET_BLOCK_EvaluationResult eval;
- eval =
- GNUNET_BLOCK_evaluate (GDS_block_context, type, key, ctx->reply_bf,
- ctx->reply_bf_mutator, ctx->xquery,
- ctx->xquery_size, data, size);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found reply for query %s in datacache, evaluation result is %d\n",
- GNUNET_h2s (key), (int) eval);
- ctx->eval = eval;
- switch (eval)
- {
- case GNUNET_BLOCK_EVALUATION_OK_MORE:
- case GNUNET_BLOCK_EVALUATION_OK_LAST:
- /* forward to local clients */
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Good RESULTS found in datacache"), 1,
- GNUNET_NO);
- struct GNUNET_PeerIdentity *get_path;
- get_path = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) *
- ctx->get_path_length);
- struct GetPath *iterator;
- iterator = ctx->head;
- int i = 0;
- while (i < ctx->get_path_length)
- {
- get_path[i] = iterator->peer;
- i++;
- iterator = iterator->next;
- }
- GDS_NEIGHBOURS_send_get_result (key,type, &(ctx->next_hop),&(ctx->source_peer),
- put_path_length, put_path, ctx->get_path_length,
- get_path, exp, data, size );
- GNUNET_free_non_null (get_path);
- break;
- case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Duplicate RESULTS found in datacache"), 1,
- GNUNET_NO);
- break;
- case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Invalid RESULTS found in datacache"), 1,
- GNUNET_NO);
- break;
- case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Irrelevant RESULTS found in datacache"), 1,
- GNUNET_NO);
- break;
- case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
- GNUNET_break (0);
- break;
- case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Unsupported RESULTS found in datacache"), 1,
- GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Unsupported block type (%u) in local response!\n"), type);
- break;
- }
-
- return (eval == GNUNET_BLOCK_EVALUATION_OK_LAST) ? GNUNET_NO : GNUNET_OK;
- }
- /**
- * 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 reply_bf where the reply bf is (to be) stored, possibly updated, can be NULL
- * @param reply_bf_mutator mutation value for reply_bf
- * @return evaluation result for the local replies
- * @get_path_length Total number of peers in get path
- * @get_path Peers in get path.
- */
- 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_CONTAINER_BloomFilter **reply_bf,
- uint32_t reply_bf_mutator,
- uint32_t get_path_length,
- struct GNUNET_PeerIdentity *get_path,
- struct GNUNET_PeerIdentity *next_hop,
- struct GNUNET_PeerIdentity *source_peer)
- {
- struct GetRequestContext ctx;
- unsigned int r;
- if (datacache == NULL)
- return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# GET requests given to datacache"),
- 1, GNUNET_NO);
- ctx.eval = GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
- ctx.key = *key;
- ctx.xquery = xquery;
- ctx.xquery_size = xquery_size;
- ctx.reply_bf = reply_bf;
- ctx.reply_bf_mutator = reply_bf_mutator;
- ctx.get_path_length = get_path_length;
-
- if (next_hop != NULL)
- {
- memcpy (&(ctx.next_hop), next_hop, sizeof (struct GNUNET_PeerIdentity));
- }
- unsigned int i = 0;
-
- ctx.head = NULL;
- ctx.tail = NULL;
- if (get_path != NULL)
- {
- while (i < get_path_length)
- {
- struct GetPath *element;
- element = GNUNET_new (struct GetPath);
- element->next = NULL;
- element->prev = NULL;
- element->peer = get_path[i];
- GNUNET_CONTAINER_DLL_insert_tail (ctx.head, ctx.tail, element);
- i++;
- }
- }
-
- r = GNUNET_DATACACHE_get (datacache, key, type, &datacache_get_iterator,
- &ctx);
- DEBUG ("DATACACHE_GET for key %s completed (%d). %u results found.\n",GNUNET_h2s (key), ctx.eval, r);
- return ctx.eval;
- }
- /**
- * Initialize datacache subsystem.
- */
- void
- GDS_DATACACHE_init ()
- {
- datacache = GNUNET_DATACACHE_create (GDS_cfg, "dhtcache");
- }
- /**
- * Shutdown datacache subsystem.
- */
- void
- GDS_DATACACHE_done ()
- {
- if (datacache != NULL)
- {
- GNUNET_DATACACHE_destroy (datacache);
- datacache = NULL;
- }
- }
- /* end of gnunet-service-dht_datacache.c */
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