/*
This file is part of GNUnet
- (C) 2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2013, 2014 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
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.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
-
/**
* @file set/gnunet-service-set_intersection.c
* @brief two-peer set intersection
* @author Christian Fuchs
+ * @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet-service-set.h"
-#include "strata_estimator.h"
-#include "set_protocol.h"
+#include "gnunet_block_lib.h"
+#include "gnunet-service-set_protocol.h"
#include <gcrypt.h>
+
/**
* Current phase we are in for a intersection operation.
*/
enum IntersectionOperationPhase
{
/**
- * We get our tunnel but received no message as of now
+ * We are just starting.
*/
- PHASE_EXPECT_INITIAL,
+ PHASE_INITIAL,
+
/**
- * We expect a BF + the number of the other peers elements
+ * We have send the number of our elements to the other
+ * peer, but did not setup our element set yet.
+ */
+ PHASE_COUNT_SENT,
+
+ /**
+ * We have initialized our set and are now reducing it by exchanging
+ * Bloom filters until one party notices the their element hashes
+ * are equal.
*/
PHASE_BF_EXCHANGE,
+
/**
- * The protocol is over.
- * Results may still have to be sent to the client.
+ * The protocol is over. Results may still have to be sent to the
+ * client.
*/
PHASE_FINISHED
+
};
/**
- * State of an evaluate operation
- * with another peer.
+ * State of an evaluate operation with another peer.
*/
struct OperationState
{
struct GNUNET_CONTAINER_BloomFilter *local_bf;
/**
- * Current state of the operation.
+ * Remaining elements in the intersection operation.
+ * Maps element-id-hashes to 'elements in our set'.
*/
- enum IntersectionOperationPhase phase;
+ struct GNUNET_CONTAINER_MultiHashMap *my_elements;
/**
- * Generation in which the operation handle
- * was created.
+ * Iterator for sending the final set of @e my_elements to the client.
*/
- unsigned int generation_created;
-
+ struct GNUNET_CONTAINER_MultiHashMapIterator *full_result_iter;
+
/**
- * Maps element-id-hashes to 'elements in our set'.
+ * Evaluate operations are held in a linked list.
*/
- struct GNUNET_CONTAINER_MultiHashMap *contained_elements;
-
+ struct OperationState *next;
+
/**
- * Current element count contained within contained_elements
+ * Evaluate operations are held in a linked list.
*/
- uint32_t contained_elements_count;
+ struct OperationState *prev;
/**
- * Iterator for sending elements on the key to element mapping to the client.
+ * For multipart BF transmissions, we have to store the
+ * bloomfilter-data until we fully received it.
*/
- struct GNUNET_CONTAINER_MultiHashMap32Iterator *full_result_iter;
-
+ char *bf_data;
+
/**
- * Evaluate operations are held in
- * a linked list.
+ * XOR of the keys of all of the elements (remaining) in my set.
+ * Always updated when elements are added or removed to
+ * @e my_elements.
*/
- struct OperationState *next;
+ struct GNUNET_HashCode my_xor;
- /**
- * Evaluate operations are held in
- * a linked list.
- */
- struct OperationState *prev;
+ /**
+ * XOR of the keys of all of the elements (remaining) in
+ * the other peer's set. Updated when we receive the
+ * other peer's Bloom filter.
+ */
+ struct GNUNET_HashCode other_xor;
+
+ /**
+ * How many bytes of @e bf_data are valid?
+ */
+ uint32_t bf_data_offset;
+
+ /**
+ * Current element count contained within @e my_elements.
+ * (May differ briefly during initialization.)
+ */
+ uint32_t my_element_count;
+
+ /**
+ * size of the bloomfilter in @e bf_data.
+ */
+ uint32_t bf_data_size;
+
+ /**
+ * size of the bloomfilter
+ */
+ uint32_t bf_bits_per_element;
+
+ /**
+ * Salt currently used for BF construction (by us or the other peer,
+ * depending on where we are in the code).
+ */
+ uint32_t salt;
+
+ /**
+ * Current state of the operation.
+ */
+ enum IntersectionOperationPhase phase;
+
+ /**
+ * Generation in which the operation handle
+ * was created.
+ */
+ unsigned int generation_created;
/**
* Did we send the client that we are done?
};
+/**
+ * Extra state required for efficient set intersection.
+ * Merely tracks the total number of elements.
+ */
+struct SetState
+{
+ /**
+ * Number of currently valid elements in the set which have not been
+ * removed.
+ */
+ uint32_t current_set_element_count;
+};
+
/**
- * Destroy a intersection operation, and free all resources
- * associated with it.
+ * If applicable in the current operation mode, send a result message
+ * to the client indicating we removed an element.
*
- * @param eo the intersection operation to destroy
+ * @param op intersection operation
+ * @param element element to send
*/
static void
-intersection_operation_destroy (struct OperationState *eo)
+send_client_removed_element (struct Operation *op,
+ struct GNUNET_SET_Element *element)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying intersection op\n");
- GNUNET_CONTAINER_DLL_remove (eo->set->state->ops_head,
- eo->set->state->ops_tail,
- eo);
- if (NULL != eo->mq)
+ struct GNUNET_MQ_Envelope *ev;
+ struct GNUNET_SET_ResultMessage *rm;
+
+ if (GNUNET_SET_RESULT_REMOVED != op->spec->result_mode)
+ return; /* Wrong mode for transmitting removed elements */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending removed element (size %u) to client\n",
+ element->size);
+ GNUNET_assert (0 != op->spec->client_request_id);
+ ev = GNUNET_MQ_msg_extra (rm,
+ element->size,
+ GNUNET_MESSAGE_TYPE_SET_RESULT);
+ if (NULL == ev)
{
- GNUNET_MQ_destroy (eo->mq);
- eo->mq = NULL;
+ GNUNET_break (0);
+ return;
}
- if (NULL != eo->tunnel)
+ rm->result_status = htons (GNUNET_SET_STATUS_OK);
+ rm->request_id = htonl (op->spec->client_request_id);
+ rm->element_type = element->element_type;
+ GNUNET_memcpy (&rm[1],
+ element->data,
+ element->size);
+ GNUNET_MQ_send (op->spec->set->client_mq,
+ ev);
+}
+
+
+/**
+ * Fills the "my_elements" hashmap with all relevant elements.
+ *
+ * @param cls the `struct Operation *` we are performing
+ * @param key current key code
+ * @param value the `struct ElementEntry *` from the hash map
+ * @return #GNUNET_YES (we should continue to iterate)
+ */
+static int
+filtered_map_initialization (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct Operation *op = cls;
+ struct ElementEntry *ee = value;
+ struct GNUNET_HashCode mutated_hash;
+
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "FIMA called for %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+
+ if (GNUNET_NO == _GSS_is_element_of_operation (ee, op))
{
- struct GNUNET_MESH_Tunnel *t = eo->tunnel;
- eo->tunnel = NULL;
- GNUNET_MESH_tunnel_destroy (t);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Reduced initialization, not starting with %s:%u (wrong generation)\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ return GNUNET_YES; /* element not valid in our operation's generation */
}
- // TODO: destroy set elements?
- if (NULL != eo->spec)
+
+ /* Test if element is in other peer's bloomfilter */
+ GNUNET_BLOCK_mingle_hash (&ee->element_hash,
+ op->state->salt,
+ &mutated_hash);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Testing mingled hash %s with salt %u\n",
+ GNUNET_h2s (&mutated_hash),
+ op->state->salt);
+ if (GNUNET_NO ==
+ GNUNET_CONTAINER_bloomfilter_test (op->state->remote_bf,
+ &mutated_hash))
{
- if (NULL != eo->spec->context_msg)
- {
- GNUNET_free (eo->spec->context_msg);
- eo->spec->context_msg = NULL;
- }
- GNUNET_free (eo->spec);
- eo->spec = NULL;
+ /* remove this element */
+ send_client_removed_element (op,
+ &ee->element);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Reduced initialization, not starting with %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ return GNUNET_YES;
}
- GNUNET_free (eo);
+ op->state->my_element_count++;
+ GNUNET_CRYPTO_hash_xor (&op->state->my_xor,
+ &ee->element_hash,
+ &op->state->my_xor);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Filtered initialization of my_elements, adding %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_put (op->state->my_elements,
+ &ee->element_hash,
+ ee,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying intersection op done\n");
+ return GNUNET_YES;
+}
+
+
+/**
+ * Removes elements from our hashmap if they are not contained within the
+ * provided remote bloomfilter.
+ *
+ * @param cls closure with the `struct Operation *`
+ * @param key current key code
+ * @param value value in the hash map
+ * @return #GNUNET_YES (we should continue to iterate)
+ */
+static int
+iterator_bf_reduce (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct Operation *op = cls;
+ struct ElementEntry *ee = value;
+ struct GNUNET_HashCode mutated_hash;
- /* FIXME: do a garbage collection of the set generations */
+ GNUNET_BLOCK_mingle_hash (&ee->element_hash,
+ op->state->salt,
+ &mutated_hash);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Testing mingled hash %s with salt %u\n",
+ GNUNET_h2s (&mutated_hash),
+ op->state->salt);
+ if (GNUNET_NO ==
+ GNUNET_CONTAINER_bloomfilter_test (op->state->remote_bf,
+ &mutated_hash))
+ {
+ GNUNET_break (0 < op->state->my_element_count);
+ op->state->my_element_count--;
+ GNUNET_CRYPTO_hash_xor (&op->state->my_xor,
+ &ee->element_hash,
+ &op->state->my_xor);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Bloom filter reduction of my_elements, removing %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (op->state->my_elements,
+ &ee->element_hash,
+ ee));
+ send_client_removed_element (op,
+ &ee->element);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Bloom filter reduction of my_elements, keeping %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Create initial bloomfilter based on all the elements given.
+ *
+ * @param cls the `struct Operation *`
+ * @param key current key code
+ * @param value the `struct ElementEntry` to process
+ * @return #GNUNET_YES (we should continue to iterate)
+ */
+static int
+iterator_bf_create (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct Operation *op = cls;
+ struct ElementEntry *ee = value;
+ struct GNUNET_HashCode mutated_hash;
+
+ GNUNET_BLOCK_mingle_hash (&ee->element_hash,
+ op->state->salt,
+ &mutated_hash);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Initializing BF with hash %s with salt %u\n",
+ GNUNET_h2s (&mutated_hash),
+ op->state->salt);
+ GNUNET_CONTAINER_bloomfilter_add (op->state->local_bf,
+ &mutated_hash);
+ return GNUNET_YES;
}
* Inform the client that the intersection operation has failed,
* and proceed to destroy the evaluate operation.
*
- * @param eo the intersection operation to fail
+ * @param op the intersection operation to fail
*/
static void
-fail_intersection_operation (struct OperationState *eo)
+fail_intersection_operation (struct Operation *op)
{
struct GNUNET_MQ_Envelope *ev;
struct GNUNET_SET_ResultMessage *msg;
- ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_RESULT);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Intersection operation failed\n");
+ if (NULL != op->state->my_elements)
+ {
+ GNUNET_CONTAINER_multihashmap_destroy (op->state->my_elements);
+ op->state->my_elements = NULL;
+ }
+ ev = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_SET_RESULT);
msg->result_status = htons (GNUNET_SET_STATUS_FAILURE);
- msg->request_id = htonl (eo->spec->client_request_id);
+ msg->request_id = htonl (op->spec->client_request_id);
msg->element_type = htons (0);
- GNUNET_MQ_send (eo->spec->set->client_mq, ev);
- intersection_operation_destroy (eo);
+ GNUNET_MQ_send (op->spec->set->client_mq,
+ ev);
+ _GSS_operation_destroy (op,
+ GNUNET_YES);
}
/**
- * Send a request for the evaluate operation to a remote peer
+ * Send a bloomfilter to our peer. After the result done message has
+ * been sent to the client, destroy the evaluate operation.
*
- * @param eo operation with the other peer
+ * @param op intersection operation
*/
static void
-send_operation_request (struct Operation *op)
+send_bloomfilter (struct Operation *op)
{
struct GNUNET_MQ_Envelope *ev;
- struct OperationRequestMessage *msg;
-
- ev = GNUNET_MQ_msg_nested_mh (msg, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST,
- op->spec->context_msg);
-
- if (NULL == ev)
+ struct BFMessage *msg;
+ uint32_t bf_size;
+ uint32_t bf_elementbits;
+ uint32_t chunk_size;
+ char *bf_data;
+ uint32_t offset;
+
+ /* We consider the ratio of the set sizes to determine
+ the number of bits per element, as the smaller set
+ should use more bits to maximize its set reduction
+ potential and minimize overall bandwidth consumption. */
+ bf_elementbits = 2 + ceil (log2((double)
+ (op->spec->remote_element_count /
+ (double) op->state->my_element_count)));
+ if (bf_elementbits < 1)
+ bf_elementbits = 1; /* make sure k is not 0 */
+ /* optimize BF-size to ~50% of bits set */
+ bf_size = ceil ((double) (op->state->my_element_count
+ * bf_elementbits / log(2)));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending Bloom filter (%u) of size %u bytes\n",
+ (unsigned int) bf_elementbits,
+ (unsigned int) bf_size);
+ op->state->local_bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
+ bf_size,
+ bf_elementbits);
+ op->state->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT32_MAX);
+ GNUNET_CONTAINER_multihashmap_iterate (op->state->my_elements,
+ &iterator_bf_create,
+ op);
+
+ /* send our Bloom filter */
+ chunk_size = 60 * 1024 - sizeof (struct BFMessage);
+ if (bf_size <= chunk_size)
{
- /* the context message is too large */
- GNUNET_break (0);
- GNUNET_SERVER_client_disconnect (op->spec->set->client);
- return;
+ /* singlepart */
+ chunk_size = bf_size;
+ ev = GNUNET_MQ_msg_extra (msg,
+ chunk_size,
+ GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF);
+ GNUNET_assert (GNUNET_SYSERR !=
+ GNUNET_CONTAINER_bloomfilter_get_raw_data (op->state->local_bf,
+ (char*) &msg[1],
+ bf_size));
+ msg->sender_element_count = htonl (op->state->my_element_count);
+ msg->bloomfilter_total_length = htonl (bf_size);
+ msg->bits_per_element = htonl (bf_elementbits);
+ msg->sender_mutator = htonl (op->state->salt);
+ msg->element_xor_hash = op->state->my_xor;
+ GNUNET_MQ_send (op->mq, ev);
}
- msg->operation = htonl (GNUNET_SET_OPERATION_INTERSECTION);
- msg->app_id = op->spec->app_id;
- msg->salt = htonl (op->spec->salt);
- GNUNET_MQ_send (op->mq, ev);
-
- if (NULL != op->spec->context_msg)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sent op request with context message\n");
else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sent op request without context message\n");
-
- if (NULL != op->spec->context_msg)
{
- GNUNET_free (op->spec->context_msg);
- op->spec->context_msg = NULL;
+ /* multipart */
+ bf_data = GNUNET_malloc (bf_size);
+ GNUNET_assert (GNUNET_SYSERR !=
+ GNUNET_CONTAINER_bloomfilter_get_raw_data (op->state->local_bf,
+ bf_data,
+ bf_size));
+ offset = 0;
+ while (offset < bf_size)
+ {
+ if (bf_size - chunk_size < offset)
+ chunk_size = bf_size - offset;
+ ev = GNUNET_MQ_msg_extra (msg,
+ chunk_size,
+ GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF);
+ GNUNET_memcpy (&msg[1],
+ &bf_data[offset],
+ chunk_size);
+ offset += chunk_size;
+ msg->sender_element_count = htonl (op->state->my_element_count);
+ msg->bloomfilter_total_length = htonl (bf_size);
+ msg->bits_per_element = htonl (bf_elementbits);
+ msg->sender_mutator = htonl (op->state->salt);
+ msg->element_xor_hash = op->state->my_xor;
+ GNUNET_MQ_send (op->mq, ev);
+ }
+ GNUNET_free (bf_data);
}
-
+ GNUNET_CONTAINER_bloomfilter_free (op->state->local_bf);
+ op->state->local_bf = NULL;
}
/**
- * Handle an BF message from a remote peer.
+ * Signal to the client that the operation has finished and
+ * destroy the operation.
*
- * @param cls the intersection operation
- * @param mh the header of the message
+ * @param cls operation to destroy
*/
static void
-handle_p2p_bf (void *cls, const struct GNUNET_MessageHeader *mh)
+send_client_done_and_destroy (void *cls)
{
- struct OperationState *eo = cls;
- struct BFMessage *msg = (struct BFMessage *) mh;
- unsigned int buckets_in_message;
-
- if (eo->phase == PHASE_EXPECT_INITIAL )
- {
- eo->phase = PHASE_BF_EXCHANGE;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "creating new bf of size %u\n", 1<<msg->order);
-
- // if (the remote peer has less elements than us)
- // run our elements through his bloomfilter
- // else if (we have the same elements)
- // done;
- //
- // evict elements we can exclude through the bloomfilter
- //
- // create a new bloomfilter over our remaining elements
- //
- // send our new count and the bloomfilter back
- }
- else if (eo->phase == PHASE_BF_EXCHANGE)
- {
-
- }
+ struct Operation *op = cls;
+ struct GNUNET_MQ_Envelope *ev;
+ struct GNUNET_SET_ResultMessage *rm;
+ ev = GNUNET_MQ_msg (rm,
+ GNUNET_MESSAGE_TYPE_SET_RESULT);
+ rm->request_id = htonl (op->spec->client_request_id);
+ rm->result_status = htons (GNUNET_SET_STATUS_DONE);
+ rm->element_type = htons (0);
+ GNUNET_MQ_send (op->spec->set->client_mq,
+ ev);
+ _GSS_operation_destroy (op,
+ GNUNET_YES);
}
/**
- * Send a result message to the client indicating
- * that there is a new element.
+ * Send all elements in the full result iterator.
*
- * @param eo intersection operation
- * @param element element to send
+ * @param cls the `struct Operation *`
*/
static void
-send_client_element (struct OperationState *eo,
- struct GNUNET_SET_Element *element)
+send_remaining_elements (void *cls)
{
+ struct Operation *op = cls;
+ const void *nxt;
+ const struct ElementEntry *ee;
struct GNUNET_MQ_Envelope *ev;
struct GNUNET_SET_ResultMessage *rm;
+ const struct GNUNET_SET_Element *element;
+ int res;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending element (size %u) to client\n", element->size);
- GNUNET_assert (0 != eo->spec->client_request_id);
- ev = GNUNET_MQ_msg_extra (rm, element->size, GNUNET_MESSAGE_TYPE_SET_RESULT);
- if (NULL == ev)
+ res = GNUNET_CONTAINER_multihashmap_iterator_next (op->state->full_result_iter,
+ NULL,
+ &nxt);
+ if (GNUNET_NO == res)
{
- GNUNET_MQ_discard (ev);
- GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending done and destroy because iterator ran out\n");
+ op->keep--;
+ send_client_done_and_destroy (op);
return;
}
+ ee = nxt;
+ element = &ee->element;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending element %s:%u to client (full set)\n",
+ GNUNET_h2s (&ee->element_hash),
+ element->size);
+ GNUNET_assert (0 != op->spec->client_request_id);
+ ev = GNUNET_MQ_msg_extra (rm,
+ element->size,
+ GNUNET_MESSAGE_TYPE_SET_RESULT);
+ GNUNET_assert (NULL != ev);
rm->result_status = htons (GNUNET_SET_STATUS_OK);
- rm->request_id = htonl (eo->spec->client_request_id);
- rm->element_type = element->type;
- memcpy (&rm[1], element->data, element->size);
- GNUNET_MQ_send (eo->spec->set->client_mq, ev);
+ rm->request_id = htonl (op->spec->client_request_id);
+ rm->element_type = element->element_type;
+ GNUNET_memcpy (&rm[1],
+ element->data,
+ element->size);
+ GNUNET_MQ_notify_sent (ev,
+ &send_remaining_elements,
+ op);
+ GNUNET_MQ_send (op->spec->set->client_mq,
+ ev);
}
/**
- * Send a result message to the client indicating
- * that the operation is over.
- * After the result done message has been sent to the client,
- * destroy the evaluate operation.
+ * Inform the peer that this operation is complete.
*
- * @param eo intersection operation
+ * @param op the intersection operation to fail
*/
static void
-send_client_done_and_destroy (struct OperationState *eo)
+send_peer_done (struct Operation *op)
{
struct GNUNET_MQ_Envelope *ev;
- struct GNUNET_SET_ResultMessage *rm;
-
- GNUNET_assert (GNUNET_NO == eo->client_done_sent);
-
- eo->client_done_sent = GNUNET_YES;
-
- ev = GNUNET_MQ_msg (rm, GNUNET_MESSAGE_TYPE_SET_RESULT);
- rm->request_id = htonl (eo->spec->client_request_id);
- rm->result_status = htons (GNUNET_SET_STATUS_DONE);
- rm->element_type = htons (0);
- GNUNET_MQ_send (eo->spec->set->client_mq, ev);
-
- intersection_operation_destroy (eo);
+ struct IntersectionDoneMessage *idm;
+
+ op->state->phase = PHASE_FINISHED;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Intersection succeeded, sending DONE\n");
+ GNUNET_CONTAINER_bloomfilter_free (op->state->local_bf);
+ op->state->local_bf = NULL;
+
+ ev = GNUNET_MQ_msg (idm,
+ GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE);
+ idm->final_element_count = htonl (op->state->my_element_count);
+ idm->element_xor_hash = op->state->my_xor;
+ GNUNET_MQ_send (op->mq,
+ ev);
}
/**
- * Send a bloomfilter to our peer.
- * that the operation is over.
- * After the result done message has been sent to the client,
- * destroy the evaluate operation.
+ * Process a Bloomfilter once we got all the chunks.
*
- * @param eo intersection operation
+ * @param op the intersection operation
*/
static void
-send_bloomfilter (struct Operation *op)
+process_bf (struct Operation *op)
{
- struct BloomFilter *bf;
- struct GNUNET_MQ_Envelope *ev;
- struct BFMessage *msg;
-
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending bf of size %u\n", );
-
- ev = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF);
- msg->reserved = 0;
- msg->sender_mutator = htonl (op->spec->salt);
- msg->sender_element_count = htonl (op->state->contained_elements_count);
- GNUNET_assert(GNUNET_SYSERR != GNUNET_CONTAINER_bloomfilter_get_raw_data(
- op->state->local_bf,
- &msg->bf_data,
- GNUNET_CRYPTO_HASH_LENGTH));
-
- GNUNET_MQ_send (op->mq, ev);
-
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received BF in phase %u, foreign count is %u, my element count is %u/%u\n",
+ op->state->phase,
+ op->spec->remote_element_count,
+ op->state->my_element_count,
+ GNUNET_CONTAINER_multihashmap_size (op->spec->set->content->elements));
+ switch (op->state->phase)
+ {
+ case PHASE_INITIAL:
+ GNUNET_break_op (0);
+ fail_intersection_operation(op);
+ return;
+ case PHASE_COUNT_SENT:
+ /* This is the first BF being sent, build our initial map with
+ filtering in place */
+ op->state->my_elements
+ = GNUNET_CONTAINER_multihashmap_create (op->spec->remote_element_count,
+ GNUNET_YES);
+ op->state->my_element_count = 0;
+ GNUNET_CONTAINER_multihashmap_iterate (op->spec->set->content->elements,
+ &filtered_map_initialization,
+ op);
+ break;
+ case PHASE_BF_EXCHANGE:
+ /* Update our set by reduction */
+ GNUNET_CONTAINER_multihashmap_iterate (op->state->my_elements,
+ &iterator_bf_reduce,
+ op);
+ break;
+ case PHASE_FINISHED:
+ GNUNET_break_op (0);
+ fail_intersection_operation(op);
+ return;
+ }
+ GNUNET_CONTAINER_bloomfilter_free (op->state->remote_bf);
+ op->state->remote_bf = NULL;
+
+ if ( (0 == op->state->my_element_count) || /* fully disjoint */
+ ( (op->state->my_element_count == op->spec->remote_element_count) &&
+ (0 == memcmp (&op->state->my_xor,
+ &op->state->other_xor,
+ sizeof (struct GNUNET_HashCode))) ) )
+ {
+ /* we are done */
+ send_peer_done (op);
+ return;
+ }
op->state->phase = PHASE_BF_EXCHANGE;
+ send_bloomfilter (op);
}
+
/**
- * Handle a done message from a remote peer
+ * Handle an BF message from a remote peer.
*
* @param cls the intersection operation
- * @param mh the message
+ * @param mh the header of the message
*/
static void
-handle_p2p_done (void *cls, const struct GNUNET_MessageHeader *mh)
+handle_p2p_bf (void *cls,
+ const struct GNUNET_MessageHeader *mh)
{
- struct OperationState *eo = cls;
- struct GNUNET_MQ_Envelope *ev;
-
- if (eo->phase == PHASE_EXPECT_ELEMENTS_AND_REQUESTS)
+ struct Operation *op = cls;
+ const struct BFMessage *msg;
+ uint32_t bf_size;
+ uint32_t chunk_size;
+ uint32_t bf_bits_per_element;
+ uint16_t msize;
+
+ msize = htons (mh->size);
+ if (msize < sizeof (struct BFMessage))
{
- /* we got all requests, but still have to send our elements as response */
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got DONE, sending final DONE after elements\n");
- eo->phase = PHASE_FINISHED;
- ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_P2P_DONE);
- GNUNET_MQ_send (eo->mq, ev);
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
return;
}
- if (eo->phase == PHASE_EXPECT_ELEMENTS)
+ msg = (const struct BFMessage *) mh;
+ switch (op->state->phase)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got final DONE\n");
- eo->phase = PHASE_FINISHED;
- send_client_done_and_destroy (eo);
- return;
+ case PHASE_INITIAL:
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ break;
+ case PHASE_COUNT_SENT:
+ case PHASE_BF_EXCHANGE:
+ bf_size = ntohl (msg->bloomfilter_total_length);
+ bf_bits_per_element = ntohl (msg->bits_per_element);
+ chunk_size = msize - sizeof (struct BFMessage);
+ op->state->other_xor = msg->element_xor_hash;
+ if (bf_size == chunk_size)
+ {
+ if (NULL != op->state->bf_data)
+ {
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ return;
+ }
+ /* single part, done here immediately */
+ op->state->remote_bf
+ = GNUNET_CONTAINER_bloomfilter_init ((const char*) &msg[1],
+ bf_size,
+ bf_bits_per_element);
+ op->state->salt = ntohl (msg->sender_mutator);
+ op->spec->remote_element_count = ntohl (msg->sender_element_count);
+ process_bf (op);
+ return;
+ }
+ /* multipart chunk */
+ if (NULL == op->state->bf_data)
+ {
+ /* first chunk, initialize */
+ op->state->bf_data = GNUNET_malloc (bf_size);
+ op->state->bf_data_size = bf_size;
+ op->state->bf_bits_per_element = bf_bits_per_element;
+ op->state->bf_data_offset = 0;
+ op->state->salt = ntohl (msg->sender_mutator);
+ op->spec->remote_element_count = ntohl (msg->sender_element_count);
+ }
+ else
+ {
+ /* increment */
+ if ( (op->state->bf_data_size != bf_size) ||
+ (op->state->bf_bits_per_element != bf_bits_per_element) ||
+ (op->state->bf_data_offset + chunk_size > bf_size) ||
+ (op->state->salt != ntohl (msg->sender_mutator)) ||
+ (op->spec->remote_element_count != ntohl (msg->sender_element_count)) )
+ {
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ return;
+ }
+ }
+ GNUNET_memcpy (&op->state->bf_data[op->state->bf_data_offset],
+ (const char*) &msg[1],
+ chunk_size);
+ op->state->bf_data_offset += chunk_size;
+ if (op->state->bf_data_offset == bf_size)
+ {
+ /* last chunk, run! */
+ op->state->remote_bf
+ = GNUNET_CONTAINER_bloomfilter_init (op->state->bf_data,
+ bf_size,
+ bf_bits_per_element);
+ GNUNET_free (op->state->bf_data);
+ op->state->bf_data = NULL;
+ op->state->bf_data_size = 0;
+ process_bf (op);
+ }
+ break;
+ default:
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ break;
}
- GNUNET_break (0);
- fail_intersection_operation (eo);
}
/**
- * Evaluate a union operation with
- * a remote peer.
+ * Fills the "my_elements" hashmap with the initial set of
+ * (non-deleted) elements from the set of the specification.
*
- * @param op operation to evaluate
+ * @param cls closure with the `struct Operation *`
+ * @param key current key code for the element
+ * @param value value in the hash map with the `struct ElementEntry *`
+ * @return #GNUNET_YES (we should continue to iterate)
*/
-static void
-intersection_evaluate (struct Operation *op)
+static int
+initialize_map_unfiltered (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- op->state = GNUNET_new (struct OperationState);
- /* we started the operation, thus we have to send the operation request */
- op->state->phase = PHASE_BF_EXCHANGE;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "evaluating intersection operation");
- send_operation_request (op);
-}
-
-
-/**
- * Alice's version:
- *
- * fills the contained-elements hashmap with all relevant
- * elements and adds their mutated hashes to our local bloomfilter with mutator+1
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return #GNUNET_YES if we should continue to
- * iterate,
- * #GNUNET_NO if not.
- */
-static int
-intersection_iterator_set_to_contained_alice (void *cls,
- const struct GNUNET_HashCode *key,
- void *value){
struct ElementEntry *ee = value;
struct Operation *op = cls;
- struct GNUNET_HashCode mutated_hash;
-
- //only consider this element, if it is valid for us
- if ((op->generation_created >= ee->generation_removed)
- || (op->generation_created < ee->generation_added))
- return GNUNET_YES;
-
- // not contained according to bob's bloomfilter
- GNUNET_BLOCK_mingle_hash(&ee->element_hash, op->spec->salt, &mutated_hash);
- if (GNUNET_NO == GNUNET_CONTAINER_bloomfilter_test (op->state->remote_bf,
- &mutated_hash))
- return GNUNET_YES;
-
- op->state->contained_elements_count++;
- GNUNET_CONTAINER_multihashmap_put (op->state->contained_elements,
- &ee->element_hash, ee,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- // create our own bloomfilter with salt+1
- GNUNET_BLOCK_mingle_hash(&ee->element_hash, op->spec->salt+1, &mutated_hash);
- GNUNET_CONTAINER_bloomfilter_add (op->state->local_bf,
- &mutated_hash);
-
+
+ if (GNUNET_NO == _GSS_is_element_of_operation (ee, op))
+ return GNUNET_YES; /* element not live in operation's generation */
+ GNUNET_CRYPTO_hash_xor (&op->state->my_xor,
+ &ee->element_hash,
+ &op->state->my_xor);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Initial full initialization of my_elements, adding %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_put (op->state->my_elements,
+ &ee->element_hash,
+ ee,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
return GNUNET_YES;
}
+
/**
- * Bob's version:
- *
- * fills the contained-elements hashmap with all relevant
- * elements and adds their mutated hashes to our local bloomfilter
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return #GNUNET_YES if we should continue to
- * iterate,
- * #GNUNET_NO if not.
- */
-static int
-intersection_iterator_set_to_contained_bob (void *cls,
- const struct GNUNET_HashCode *key,
- void *value){
- struct ElementEntry *ee = value;
- struct Operation *op = cls;
- struct GNUNET_HashCode mutated_hash;
-
- //only consider this element, if it is valid for us
- if ((op->generation_created >= ee->generation_removed)
- || (op->generation_created < ee->generation_added))
- return GNUNET_YES;
-
- GNUNET_CONTAINER_multihashmap_put (op->state->contained_elements,
- &ee->element_hash, ee,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- op->state->contained_elements_count++;
-
- GNUNET_BLOCK_mingle_hash(&ee->element_hash, op->spec->salt, &mutated_hash);
-
- GNUNET_CONTAINER_bloomfilter_add (op->state->local_bf,
- &mutated_hash);
-
- return GNUNET_YES;
+ * Send our element count to the peer, in case our element count is
+ * lower than his.
+ *
+ * @param op intersection operation
+ */
+static void
+send_element_count (struct Operation *op)
+{
+ struct GNUNET_MQ_Envelope *ev;
+ struct IntersectionElementInfoMessage *msg;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending our element count (%u)\n",
+ op->state->my_element_count);
+ ev = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO);
+ msg->sender_element_count = htonl (op->state->my_element_count);
+ GNUNET_MQ_send (op->mq, ev);
}
+
/**
- * removes element from a hashmap if it is not contained within the
- * provided remote bloomfilter.
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return #GNUNET_YES if we should continue to
- * iterate,
- * #GNUNET_NO if not.
+ * We go first, initialize our map with all elements and
+ * send the first Bloom filter.
+ *
+ * @param op operation to start exchange for
*/
-static int
-intersection_iterator_element_removal (void *cls,
- const struct GNUNET_HashCode *key,
- void *value){
- struct ElementEntry *ee = value;
- struct Operation *op = cls;
- struct GNUNET_HashCode mutated_hash;
-
- GNUNET_BLOCK_mingle_hash(&ee->element_hash, op->spec->salt, &mutated_hash);
-
- if (GNUNET_NO == GNUNET_CONTAINER_bloomfilter_test (op->state->remote_bf,
- &mutated_hash)){
- op->state->contained_elements_count--;
- GNUNET_CONTAINER_multihashmap_remove (op->state->contained_elements,
- &ee->element_hash,
- ee);
- }
-
- return GNUNET_YES;
+static void
+begin_bf_exchange (struct Operation *op)
+{
+ op->state->phase = PHASE_BF_EXCHANGE;
+ op->state->my_elements
+ = GNUNET_CONTAINER_multihashmap_create (op->state->my_element_count,
+ GNUNET_YES);
+ GNUNET_CONTAINER_multihashmap_iterate (op->spec->set->content->elements,
+ &initialize_map_unfiltered,
+ op);
+ send_bloomfilter (op);
}
+
/**
- * removes element from a hashmap if it is not contained within the
- * provided remote bloomfilter.
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return #GNUNET_YES if we should continue to
- * iterate,
- * #GNUNET_NO if not.
+ * Handle the initial `struct IntersectionElementInfoMessage` from a
+ * remote peer.
+ *
+ * @param cls the intersection operation
+ * @param mh the header of the message
*/
-static int
-intersection_iterator_create_bf (void *cls,
- const struct GNUNET_HashCode *key,
- void *value){
- struct ElementEntry *ee = value;
+static void
+handle_p2p_element_info (void *cls,
+ const struct GNUNET_MessageHeader *mh)
+{
struct Operation *op = cls;
- struct GNUNET_HashCode mutated_hash;
-
- GNUNET_BLOCK_mingle_hash(&ee->element_hash, op->spec->salt, &mutated_hash);
-
- GNUNET_CONTAINER_bloomfilter_add (op->state->local_bf,
- &mutated_hash);
-
- return GNUNET_YES;
+ const struct IntersectionElementInfoMessage *msg;
+
+ if (ntohs (mh->size) != sizeof (struct IntersectionElementInfoMessage))
+ {
+ GNUNET_break_op (0);
+ fail_intersection_operation(op);
+ return;
+ }
+ msg = (const struct IntersectionElementInfoMessage *) mh;
+ op->spec->remote_element_count = ntohl (msg->sender_element_count);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received remote element count (%u), I have %u\n",
+ op->spec->remote_element_count,
+ op->state->my_element_count);
+ if ( ( (PHASE_INITIAL != op->state->phase) &&
+ (PHASE_COUNT_SENT != op->state->phase) ) ||
+ (op->state->my_element_count > op->spec->remote_element_count) ||
+ (0 == op->state->my_element_count) ||
+ (0 == op->spec->remote_element_count) )
+ {
+ GNUNET_break_op (0);
+ fail_intersection_operation(op);
+ return;
+ }
+ GNUNET_break (NULL == op->state->remote_bf);
+ begin_bf_exchange (op);
}
/**
- * Accept an union operation request from a remote peer.
- * Only initializes the private operation state.
+ * Send a result message to the client indicating that the operation
+ * is over. After the result done message has been sent to the
+ * client, destroy the evaluate operation.
*
- * @param op operation that will be accepted as a union operation
+ * @param op intersection operation
*/
static void
-intersection_accept (struct Operation *op)
+finish_and_destroy (struct Operation *op)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "accepting set union operation\n");
- op->state = GNUNET_new (struct OperationState);
-
- op->state->contained_elements = GNUNET_CONTAINER_multihashmap_create(1, GNUNET_YES);
- op->state-> = GNUNET_CONTAINER_multihashmap_create(1, GNUNET_YES);
-
- op->state->local_bf = GNUNET_CONTAINER_bloomfilter_init(NULL, , GNUNET_CONSTANTS_BLOOMFILTER_K);
-
- GNUNET_CONTAINER_multihashmap_iterate(op->spec->set->elements,
- &intersection_iterator_set_to_contained_bob,
- op);
- /* kick off the operation */
- send_bloomfilter (op);
+ GNUNET_assert (GNUNET_NO == op->state->client_done_sent);
+
+ if (GNUNET_SET_RESULT_FULL == op->spec->result_mode)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending full result set (%u elements)\n",
+ GNUNET_CONTAINER_multihashmap_size (op->state->my_elements));
+ op->state->full_result_iter
+ = GNUNET_CONTAINER_multihashmap_iterator_create (op->state->my_elements);
+ op->keep++;
+ send_remaining_elements (op);
+ return;
+ }
+ send_client_done_and_destroy (op);
}
/**
- * Create a new set supporting the intersection operation
+ * Remove all elements from our hashmap.
*
- * @return the newly created set
+ * @param cls closure with the `struct Operation *`
+ * @param key current key code
+ * @param value value in the hash map
+ * @return #GNUNET_YES (we should continue to iterate)
*/
-static struct SetState *
-intersection_set_create (void)
+static int
+filter_all (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- struct SetState *set_state;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "intersection set created\n");
+ struct Operation *op = cls;
+ struct ElementEntry *ee = value;
- set_state = GNUNET_new (struct SetState);
-
- return set_state;
+ GNUNET_break (0 < op->state->my_element_count);
+ op->state->my_element_count--;
+ GNUNET_CRYPTO_hash_xor (&op->state->my_xor,
+ &ee->element_hash,
+ &op->state->my_xor);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Final reduction of my_elements, removing %s:%u\n",
+ GNUNET_h2s (&ee->element_hash),
+ ee->element.size);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (op->state->my_elements,
+ &ee->element_hash,
+ ee));
+ send_client_removed_element (op,
+ &ee->element);
+ return GNUNET_YES;
}
/**
- * Add the element from the given element message to the set.
+ * Handle a done message from a remote peer
*
- * @param set_state state of the set want to add to
- * @param ee the element to add to the set
+ * @param cls the intersection operation
+ * @param mh the message
*/
static void
-intersection_add (struct SetState *set_state, struct ElementEntry *ee)
+handle_p2p_done (void *cls,
+ const struct GNUNET_MessageHeader *mh)
{
- //nothing to do here
+ struct Operation *op = cls;
+ const struct IntersectionDoneMessage *idm;
+
+ if (PHASE_BF_EXCHANGE != op->state->phase)
+ {
+ /* wrong phase to conclude? FIXME: Or should we allow this
+ if the other peer has _initially_ already an empty set? */
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ return;
+ }
+ if (ntohs (mh->size) != sizeof (struct IntersectionDoneMessage))
+ {
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ return;
+ }
+ idm = (const struct IntersectionDoneMessage *) mh;
+ if (0 == ntohl (idm->final_element_count))
+ {
+ /* other peer determined empty set is the intersection,
+ remove all elements */
+ GNUNET_CONTAINER_multihashmap_iterate (op->state->my_elements,
+ &filter_all,
+ op);
+ }
+ if ( (op->state->my_element_count != ntohl (idm->final_element_count)) ||
+ (0 != memcmp (&op->state->my_xor,
+ &idm->element_xor_hash,
+ sizeof (struct GNUNET_HashCode))) )
+ {
+ /* Other peer thinks we are done, but we disagree on the result! */
+ GNUNET_break_op (0);
+ fail_intersection_operation (op);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got IntersectionDoneMessage, have %u elements in intersection\n",
+ op->state->my_element_count);
+ op->state->phase = PHASE_FINISHED;
+ finish_and_destroy (op);
}
/**
- * Destroy a set that supports the intersection operation
+ * Initiate a set intersection operation with a remote peer.
*
- * @param set_state the set to destroy
+ * @param op operation that is created, should be initialized to
+ * begin the evaluation
+ * @param opaque_context message to be transmitted to the listener
+ * to convince him to accept, may be NULL
*/
static void
-intersection_set_destroy (struct SetState *set_state)
+intersection_evaluate (struct Operation *op,
+ const struct GNUNET_MessageHeader *opaque_context)
{
- GNUNET_free (set_state);
+ struct GNUNET_MQ_Envelope *ev;
+ struct OperationRequestMessage *msg;
+
+ op->state = GNUNET_new (struct OperationState);
+ /* we started the operation, thus we have to send the operation request */
+ op->state->phase = PHASE_INITIAL;
+ op->state->my_element_count = op->spec->set->state->current_set_element_count;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Initiating intersection operation evaluation\n");
+ ev = GNUNET_MQ_msg_nested_mh (msg,
+ GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST,
+ opaque_context);
+ if (NULL == ev)
+ {
+ /* the context message is too large!? */
+ GNUNET_break (0);
+ GNUNET_SERVICE_client_drop (op->spec->set->client);
+ return;
+ }
+ msg->operation = htonl (GNUNET_SET_OPERATION_INTERSECTION);
+ msg->element_count = htonl (op->state->my_element_count);
+ GNUNET_MQ_send (op->mq,
+ ev);
+ op->state->phase = PHASE_COUNT_SENT;
+ if (NULL != opaque_context)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sent op request with context message\n");
+ else
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sent op request without context message\n");
}
/**
- * Remove the element given in the element message from the set.
+ * Accept an intersection operation request from a remote peer. Only
+ * initializes the private operation state.
*
- * @param set_state state of the set to remove from
- * @param element set element to remove
+ * @param op operation that will be accepted as an intersection operation
*/
static void
-intersection_remove (struct SetState *set_state, struct ElementEntry *element)
+intersection_accept (struct Operation *op)
{
- //nothing to do here
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Accepting set intersection operation\n");
+ op->state = GNUNET_new (struct OperationState);
+ op->state->phase = PHASE_INITIAL;
+ op->state->my_element_count
+ = op->spec->set->state->current_set_element_count;
+ op->state->my_elements
+ = GNUNET_CONTAINER_multihashmap_create
+ (GNUNET_MIN (op->state->my_element_count,
+ op->spec->remote_element_count),
+ GNUNET_YES);
+ if (op->spec->remote_element_count < op->state->my_element_count)
+ {
+ /* If the other peer (Alice) has fewer elements than us (Bob),
+ we just send the count as Alice should send the first BF */
+ send_element_count (op);
+ op->state->phase = PHASE_COUNT_SENT;
+ return;
+ }
+ /* We have fewer elements, so we start with the BF */
+ begin_bf_exchange (op);
}
/**
* Dispatch messages for a intersection operation.
*
- * @param eo the state of the intersection evaluate operation
+ * @param op the state of the intersection evaluate operation
* @param mh the received message
- * @return GNUNET_SYSERR if the tunnel should be disconnected,
- * GNUNET_OK otherwise
+ * @return #GNUNET_SYSERR if the tunnel should be disconnected,
+ * #GNUNET_OK otherwise
*/
-int
-intersection_handle_p2p_message (struct OperationState *eo,
- const struct GNUNET_MessageHeader *mh)
+static int
+intersection_handle_p2p_message (struct Operation *op,
+ const struct GNUNET_MessageHeader *mh)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received p2p message (t: %u, s: %u)\n",
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received p2p message (t: %u, s: %u)\n",
ntohs (mh->type), ntohs (mh->size));
switch (ntohs (mh->type))
{
/* this message handler is not active until after we received an
* operation request message, thus the ops request is not handled here
*/
- case GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF:
- handle_p2p_bf (eo, mh);
- break;
- case GNUNET_MESSAGE_TYPE_SET_P2P_DONE:
- handle_p2p_done (eo, mh);
- break;
- default:
- /* something wrong with mesh's message handlers? */
- GNUNET_assert (0);
+ case GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO:
+ handle_p2p_element_info (op, mh);
+ break;
+ case GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF:
+ handle_p2p_bf (op, mh);
+ break;
+ case GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE:
+ handle_p2p_done (op, mh);
+ break;
+ default:
+ /* something wrong with cadet's message handlers? */
+ GNUNET_assert (0);
}
return GNUNET_OK;
}
-/**
- * Signal to the client that the operation has finished and
- * destroy the operation.
- *
- * @param cls operation to destroy
- */
-static void
-send_done_and_destroy (void *cls)
-{
- struct Operation *op = cls;
- struct GNUNET_MQ_Envelope *ev;
- struct GNUNET_SET_ResultMessage *rm;
- ev = GNUNET_MQ_msg (rm, GNUNET_MESSAGE_TYPE_SET_RESULT);
- rm->request_id = htonl (op->spec->client_request_id);
- rm->result_status = htons (GNUNET_SET_STATUS_DONE);
- rm->element_type = htons (0);
- GNUNET_MQ_send (op->spec->set->client_mq, ev);
- _GSS_operation_destroy (op);
-}
/**
- * Send a result message to the client indicating
- * that the operation is over.
- * After the result done message has been sent to the client,
- * destroy the evaluate operation.
+ * Handler for peer-disconnects, notifies the client about the aborted
+ * operation. If we did not expect anything from the other peer, we
+ * gracefully terminate the operation.
*
- * @param op union operation
- */
-static void
-finish_and_destroy (struct Operation *op)
-{
- GNUNET_assert (GNUNET_NO == op->state->client_done_sent);
-
- if (GNUNET_SET_RESULT_FULL == op->spec->result_mode)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending full result set\n");
- GNUNET_assert (NULL == op->state->full_result_iter);
- op->state->full_result_iter =
- GNUNET_CONTAINER_multihashmap32_iterator_create (op->state->contained_elements);
- return;
- }
- send_done_and_destroy (op);
-}
-
-/**
- * handler for peer-disconnects, notifies the client about the aborted operation
- *
* @param op the destroyed operation
*/
static void
{
if (PHASE_FINISHED != op->state->phase)
{
- struct GNUNET_MQ_Envelope *ev;
- struct GNUNET_SET_ResultMessage *msg;
-
- ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_RESULT);
- msg->request_id = htonl (op->spec->client_request_id);
- msg->result_status = htons (GNUNET_SET_STATUS_FAILURE);
- msg->element_type = htons (0);
- GNUNET_MQ_send (op->spec->set->client_mq, ev);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "other peer disconnected prematurely\n");
- _GSS_operation_destroy (op);
+ fail_intersection_operation (op);
return;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "other peer disconnected (finished)\n");
+ /* the session has already been concluded */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Other peer disconnected (finished)\n");
if (GNUNET_NO == op->state->client_done_sent)
finish_and_destroy (op);
}
/**
- * Destroy the union operation. Only things specific to the union operation are destroyed.
- *
- * @param op union operation to destroy
+ * Destroy the intersection operation. Only things specific to the
+ * intersection operation are destroyed.
+ *
+ * @param op intersection operation to destroy
*/
static void
intersection_op_cancel (struct Operation *op)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying intersection op\n");
/* check if the op was canceled twice */
GNUNET_assert (NULL != op->state);
if (NULL != op->state->remote_bf)
GNUNET_CONTAINER_bloomfilter_free (op->state->local_bf);
op->state->local_bf = NULL;
}
- if (NULL != op->state->contained_elements)
+ if (NULL != op->state->my_elements)
{
- // no need to free the elements, they are still part of the set
- GNUNET_CONTAINER_multihashmap_destroy (op->state->contained_elements);
- op->state->contained_elements = NULL;
+ GNUNET_CONTAINER_multihashmap_destroy (op->state->my_elements);
+ op->state->my_elements = NULL;
}
GNUNET_free (op->state);
op->state = NULL;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying intersection op done\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Destroying intersection op state done\n");
}
+
+/**
+ * Create a new set supporting the intersection operation.
+ *
+ * @return the newly created set
+ */
+static struct SetState *
+intersection_set_create ()
+{
+ struct SetState *set_state;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Intersection set created\n");
+ set_state = GNUNET_new (struct SetState);
+ set_state->current_set_element_count = 0;
+
+ return set_state;
+}
+
+
+/**
+ * Add the element from the given element message to the set.
+ *
+ * @param set_state state of the set want to add to
+ * @param ee the element to add to the set
+ */
+static void
+intersection_add (struct SetState *set_state,
+ struct ElementEntry *ee)
+{
+ set_state->current_set_element_count++;
+}
+
+
+/**
+ * Destroy a set that supports the intersection operation
+ *
+ * @param set_state the set to destroy
+ */
+static void
+intersection_set_destroy (struct SetState *set_state)
+{
+ GNUNET_free (set_state);
+}
+
+
+/**
+ * Remove the element given in the element message from the set.
+ *
+ * @param set_state state of the set to remove from
+ * @param element set element to remove
+ */
+static void
+intersection_remove (struct SetState *set_state,
+ struct ElementEntry *element)
+{
+ GNUNET_assert (0 < set_state->current_set_element_count);
+ set_state->current_set_element_count--;
+}
+
+
+/**
+ * Get the table with implementing functions for set intersection.
+ *
+ * @return the operation specific VTable
+ */
const struct SetVT *
_GSS_intersection_vt ()
{
projects / oweals / gnunet.git / blobdiff