+static struct Operation *
+get_incoming (uint32_t id)
+{
+ struct Operation *op;
+
+ for (op = incoming_head; NULL != op; op = op->next)
+ if (op->suggest_id == id)
+ {
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ return op;
+ }
+ return NULL;
+}
+
+
+/**
+ * Destroy a listener, free all resources associated with it.
+ *
+ * @param listener listener to destroy
+ */
+static void
+listener_destroy (struct Listener *listener)
+{
+ /* If the client is not dead yet, destroy it.
+ * The client's destroy callback will destroy the listener again. */
+ if (NULL != listener->client)
+ {
+ struct GNUNET_SERVER_Client *client = listener->client;
+
+ listener->client = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting listener client\n");
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ if (NULL != listener->client_mq)
+ {
+ GNUNET_MQ_destroy (listener->client_mq);
+ listener->client_mq = NULL;
+ }
+ GNUNET_CADET_close_port (listener->open_port);
+ GNUNET_CONTAINER_DLL_remove (listeners_head,
+ listeners_tail,
+ listener);
+ GNUNET_free (listener);
+}
+
+
+/**
+ * Context for the #garbage_collect_cb().
+ */
+struct GarbageContext
+{
+
+ /**
+ * Map for which we are garbage collecting removed elements.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *map;
+
+ /**
+ * Lowest generation for which an operation is still pending.
+ */
+ unsigned int min_op_generation;
+
+ /**
+ * Largest generation for which an operation is still pending.
+ */
+ unsigned int max_op_generation;
+
+};
+
+
+/**
+ * Function invoked to check if an element can be removed from
+ * the set's history because it is no longer needed.
+ *
+ * @param cls the `struct GarbageContext *`
+ * @param key key of the element in the map
+ * @param value the `struct ElementEntry *`
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+garbage_collect_cb (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ //struct GarbageContext *gc = cls;
+ //struct ElementEntry *ee = value;
+
+ //if (GNUNET_YES != ee->removed)
+ // return GNUNET_OK;
+ //if ( (gc->max_op_generation < ee->generation_added) ||
+ // (ee->generation_removed > gc->min_op_generation) )
+ //{
+ // GNUNET_assert (GNUNET_YES ==
+ // GNUNET_CONTAINER_multihashmap_remove (gc->map,
+ // key,
+ // ee));
+ // GNUNET_free (ee);
+ //}
+ return GNUNET_OK;
+}
+
+
+/**
+ * Collect and destroy elements that are not needed anymore, because
+ * their lifetime (as determined by their generation) does not overlap
+ * with any active set operation.
+ *
+ * @param set set to garbage collect
+ */
+static void
+collect_generation_garbage (struct Set *set)
+{
+ struct Operation *op;
+ struct GarbageContext gc;
+
+ gc.min_op_generation = UINT_MAX;
+ gc.max_op_generation = 0;
+ for (op = set->ops_head; NULL != op; op = op->next)
+ {
+ gc.min_op_generation = GNUNET_MIN (gc.min_op_generation,
+ op->generation_created);
+ gc.max_op_generation = GNUNET_MAX (gc.max_op_generation,
+ op->generation_created);
+ }
+ gc.map = set->content->elements;
+ GNUNET_CONTAINER_multihashmap_iterate (set->content->elements,
+ &garbage_collect_cb,
+ &gc);
+}
+
+
+static int
+is_excluded_generation (unsigned int generation,
+ struct GenerationRange *excluded,
+ unsigned int excluded_size)
+{
+ unsigned int i;
+
+ for (i = 0; i < excluded_size; i++)
+ {
+ if ( (generation >= excluded[i].start) && (generation < excluded[i].end) )
+ return GNUNET_YES;
+ }
+
+ return GNUNET_NO;
+}
+
+
+static int
+is_element_of_generation (struct ElementEntry *ee,
+ unsigned int query_generation,
+ struct GenerationRange *excluded,
+ unsigned int excluded_size)
+{
+ struct MutationEvent *mut;
+ int is_present;
+ unsigned int i;
+
+ GNUNET_assert (NULL != ee->mutations);
+
+ if (GNUNET_YES == is_excluded_generation (query_generation, excluded, excluded_size))
+ {
+ GNUNET_break (0);
+ return GNUNET_NO;
+ }
+
+ is_present = GNUNET_NO;
+
+ /* Could be made faster with binary search, but lists
+ are small, so why bother. */
+ for (i = 0; i < ee->mutations_size; i++)
+ {
+ mut = &ee->mutations[i];
+
+ if (mut->generation > query_generation)
+ {
+ /* The mutation doesn't apply to our generation
+ anymore. We can'b break here, since mutations aren't
+ sorted by generation. */
+ continue;
+ }
+
+ if (GNUNET_YES == is_excluded_generation (mut->generation, excluded, excluded_size))
+ {
+ /* The generation is excluded (because it belongs to another
+ fork via a lazy copy) and thus mutations aren't considered
+ for membership testing. */
+ continue;
+ }
+
+ /* This would be an inconsistency in how we manage mutations. */
+ if ( (GNUNET_YES == is_present) && (GNUNET_YES == mut->added) )
+ GNUNET_assert (0);
+
+ /* Likewise. */
+ if ( (GNUNET_NO == is_present) && (GNUNET_NO == mut->added) )
+ GNUNET_assert (0);
+
+ is_present = mut->added;
+ }
+
+ return is_present;
+}
+
+
+int
+_GSS_is_element_of_set (struct ElementEntry *ee,
+ struct Set *set)
+{
+ return is_element_of_generation (ee,
+ set->current_generation,
+ set->excluded_generations,
+ set->excluded_generations_size);
+}
+
+
+static int
+is_element_of_iteration (struct ElementEntry *ee,
+ struct Set *set)
+{
+ return is_element_of_generation (ee,
+ set->iter_generation,
+ set->excluded_generations,
+ set->excluded_generations_size);
+}
+
+
+int
+_GSS_is_element_of_operation (struct ElementEntry *ee,
+ struct Operation *op)
+{
+ return is_element_of_generation (ee,
+ op->generation_created,
+ op->spec->set->excluded_generations,
+ op->spec->set->excluded_generations_size);
+}
+
+
+/**
+ * Destroy the given operation. Call the implementation-specific
+ * cancel function of the operation. Disconnects from the remote
+ * peer. Does not disconnect the client, as there may be multiple
+ * operations per set.
+ *
+ * @param op operation to destroy
+ * @param gc #GNUNET_YES to perform garbage collection on the set
+ */
+void
+_GSS_operation_destroy (struct Operation *op,
+ int gc)
+{
+ struct Set *set;
+ struct GNUNET_CADET_Channel *channel;
+
+ if (NULL == op->vt)
+ {
+ /* already in #_GSS_operation_destroy() */
+ return;
+ }
+ GNUNET_assert (GNUNET_NO == op->is_incoming);
+ GNUNET_assert (NULL != op->spec);
+ set = op->spec->set;
+ GNUNET_CONTAINER_DLL_remove (set->ops_head,
+ set->ops_tail,
+ op);
+ op->vt->cancel (op);
+ op->vt = NULL;
+ if (NULL != op->spec)
+ {
+ if (NULL != op->spec->context_msg)
+ {
+ GNUNET_free (op->spec->context_msg);
+ op->spec->context_msg = NULL;
+ }
+ GNUNET_free (op->spec);
+ op->spec = NULL;
+ }
+ if (NULL != op->mq)
+ {
+ GNUNET_MQ_destroy (op->mq);
+ op->mq = NULL;
+ }
+ if (NULL != (channel = op->channel))
+ {
+ op->channel = NULL;
+ GNUNET_CADET_channel_destroy (channel);
+ }
+ if (GNUNET_YES == gc)
+ collect_generation_garbage (set);
+ /* We rely on the channel end handler to free 'op'. When 'op->channel' was NULL,
+ * there was a channel end handler that will free 'op' on the call stack. */
+}
+
+
+/**
+ * Iterator over hash map entries to free element entries.
+ *
+ * @param cls closure
+ * @param key current key code
+ * @param value a `struct ElementEntry *` to be free'd
+ * @return #GNUNET_YES (continue to iterate)
+ */
+static int
+destroy_elements_iterator (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct ElementEntry *ee = value;
+
+ GNUNET_free_non_null (ee->mutations);
+
+ GNUNET_free (ee);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Destroy a set, and free all resources and operations associated with it.
+ *
+ * @param set the set to destroy
+ */
+static void
+set_destroy (struct Set *set)
+{
+ if (NULL != set->client)
+ {
+ /* If the client is not dead yet, destroy it. The client's destroy
+ * callback will call `set_destroy()` again in this case. We do
+ * this so that the channel end handler still has a valid set handle
+ * to destroy. */
+ struct GNUNET_SERVER_Client *client = set->client;
+
+ set->client = NULL;
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ GNUNET_assert (NULL != set->state);
+ while (NULL != set->ops_head)
+ _GSS_operation_destroy (set->ops_head, GNUNET_NO);
+ set->vt->destroy_set (set->state);
+ set->state = NULL;
+ if (NULL != set->client_mq)
+ {
+ GNUNET_MQ_destroy (set->client_mq);
+ set->client_mq = NULL;
+ }
+ if (NULL != set->iter)
+ {
+ GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
+ set->iter = NULL;
+ set->iteration_id++;
+ }
+ {
+ struct SetContent *content;
+ struct PendingMutation *pm;
+ struct PendingMutation *pm_current;
+
+ content = set->content;
+
+ // discard any pending mutations that reference this set
+ pm = content->pending_mutations_head;
+ while (NULL != pm)
+ {
+ pm_current = pm;
+ pm = pm->next;
+ if (pm_current-> set == set)
+ GNUNET_CONTAINER_DLL_remove (content->pending_mutations_head,
+ content->pending_mutations_tail,
+ pm_current);
+
+ }
+
+ set->content = NULL;
+ GNUNET_assert (0 != content->refcount);
+ content->refcount -= 1;
+ if (0 == content->refcount)
+ {
+ GNUNET_assert (NULL != content->elements);
+ GNUNET_CONTAINER_multihashmap_iterate (content->elements,
+ &destroy_elements_iterator,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (content->elements);
+ content->elements = NULL;
+ GNUNET_free (content);
+ }
+ }
+ GNUNET_free_non_null (set->excluded_generations);
+ set->excluded_generations = NULL;
+ GNUNET_CONTAINER_DLL_remove (sets_head,
+ sets_tail,
+ set);
+
+ // remove set from pending copy requests
+ {
+ struct LazyCopyRequest *lcr;
+ lcr = lazy_copy_head;
+ while (NULL != lcr)
+ {
+ struct LazyCopyRequest *lcr_current;
+ lcr_current = lcr;
+ lcr = lcr->next;
+ if (lcr_current->source_set == set)
+ GNUNET_CONTAINER_DLL_remove (lazy_copy_head,
+ lazy_copy_tail,
+ lcr_current);
+ }
+ }
+
+ GNUNET_free (set);
+}
+
+
+/**
+ * Clean up after a client has disconnected
+ *
+ * @param cls closure, unused
+ * @param client the client to clean up after
+ */
+static void
+handle_client_disconnect (void *cls,
+ struct GNUNET_SERVER_Client *client)
+{
+ struct Listener *listener;
+ struct Set *set;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "client disconnected, cleaning up\n");
+ set = set_get (client);
+ if (NULL != set)
+ {
+ set->client = NULL;
+ set_destroy (set);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client's set destroyed\n");
+ }
+ listener = listener_get (client);
+ if (NULL != listener)
+ {
+ listener->client = NULL;
+ listener_destroy (listener);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client's listener destroyed\n");
+ }
+}
+
+
+/**
+ * Destroy an incoming request from a remote peer
+ *
+ * @param incoming remote request to destroy
+ */
+static void
+incoming_destroy (struct Operation *incoming)
+{
+ struct GNUNET_CADET_Channel *channel;
+
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ GNUNET_CONTAINER_DLL_remove (incoming_head,
+ incoming_tail,
+ incoming);
+ if (NULL != incoming->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (incoming->timeout_task);
+ incoming->timeout_task = NULL;
+ }
+ /* make sure that the tunnel end handler will not destroy us again */
+ incoming->vt = NULL;
+ if (NULL != incoming->spec)
+ {
+ GNUNET_free (incoming->spec);
+ incoming->spec = NULL;
+ }
+ if (NULL != incoming->mq)
+ {
+ GNUNET_MQ_destroy (incoming->mq);
+ incoming->mq = NULL;
+ }
+ if (NULL != (channel = incoming->channel))
+ {
+ incoming->channel = NULL;
+ GNUNET_CADET_channel_destroy (channel);
+ }
+}
+
+
+/**
+ * Suggest the given request to the listener. The listening client can
+ * then accept or reject the remote request.
+ *
+ * @param incoming the incoming peer with the request to suggest
+ * @param listener the listener to suggest the request to
+ */
+static void
+incoming_suggest (struct Operation *incoming,
+ struct Listener *listener)
+{
+ struct GNUNET_MQ_Envelope *mqm;
+ struct GNUNET_SET_RequestMessage *cmsg;
+
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ GNUNET_assert (NULL != incoming->spec);
+ GNUNET_assert (0 == incoming->suggest_id);
+ incoming->suggest_id = suggest_id++;
+ if (0 == suggest_id)
+ suggest_id++;
+ GNUNET_assert (NULL != incoming->timeout_task);
+ GNUNET_SCHEDULER_cancel (incoming->timeout_task);
+ incoming->timeout_task = NULL;
+ mqm = GNUNET_MQ_msg_nested_mh (cmsg,
+ GNUNET_MESSAGE_TYPE_SET_REQUEST,
+ incoming->spec->context_msg);
+ GNUNET_assert (NULL != mqm);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Suggesting incoming request with accept id %u to listener\n",
+ incoming->suggest_id);
+ cmsg->accept_id = htonl (incoming->suggest_id);
+ cmsg->peer_id = incoming->spec->peer;
+ GNUNET_MQ_send (listener->client_mq,
+ mqm);
+}
+
+
+/**
+ * Handle a request for a set operation from another peer. Checks if we
+ * have a listener waiting for such a request (and in that case initiates
+ * asking the listener about accepting the connection). If no listener
+ * is waiting, we queue the operation request in hope that a listener
+ * shows up soon (before timeout).
+ *
+ * This msg is expected as the first and only msg handled through the
+ * non-operation bound virtual table, acceptance of this operation replaces
+ * our virtual table and subsequent msgs would be routed differently (as
+ * we then know what type of operation this is).
+ *
+ * @param op the operation state
+ * @param mh the received message
+ * @return #GNUNET_OK if the channel should be kept alive,
+ * #GNUNET_SYSERR to destroy the channel
+ */
+static int
+handle_incoming_msg (struct Operation *op,
+ const struct GNUNET_MessageHeader *mh)
+{
+ const struct OperationRequestMessage *msg;
+ struct Listener *listener = op->listener;
+ struct OperationSpecification *spec;
+ const struct GNUNET_MessageHeader *nested_context;
+
+ msg = (const struct OperationRequestMessage *) mh;
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ if (GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST != ntohs (mh->type))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ /* double operation request */
+ if (NULL != op->spec)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ spec = GNUNET_new (struct OperationSpecification);
+ nested_context = GNUNET_MQ_extract_nested_mh (msg);
+ if ( (NULL != nested_context) &&
+ (ntohs (nested_context->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free (spec);
+ return GNUNET_SYSERR;
+ }
+ /* Make a copy of the nested_context (application-specific context
+ information that is opaque to set) so we can pass it to the
+ listener later on */
+ if (NULL != nested_context)
+ spec->context_msg = GNUNET_copy_message (nested_context);
+ spec->operation = ntohl (msg->operation);
+ spec->app_id = listener->app_id;
+ spec->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT32_MAX);
+ spec->peer = op->peer;
+ spec->remote_element_count = ntohl (msg->element_count);
+ op->spec = spec;
+
+ listener = op->listener;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received P2P operation request (op %u, port %s) for active listener\n",
+ ntohl (msg->operation),
+ GNUNET_h2s (&listener->app_id));
+ incoming_suggest (op,
+ listener);
+ return GNUNET_OK;
+}
+
+
+static void
+execute_add (struct Set *set,
+ const struct GNUNET_MessageHeader *m)
+{
+ const struct GNUNET_SET_ElementMessage *msg;
+ struct GNUNET_SET_Element el;
+ struct ElementEntry *ee;
+ struct GNUNET_HashCode hash;
+
+ GNUNET_assert (GNUNET_MESSAGE_TYPE_SET_ADD == ntohs (m->type));
+
+ msg = (const struct GNUNET_SET_ElementMessage *) m;
+ el.size = ntohs (m->size) - sizeof *msg;
+ el.data = &msg[1];
+ el.element_type = ntohs (msg->element_type);
+ GNUNET_SET_element_hash (&el, &hash);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client inserts element %s of size %u\n",
+ GNUNET_h2s (&hash),
+ el.size);
+
+ ee = GNUNET_CONTAINER_multihashmap_get (set->content->elements,
+ &hash);
+
+ if (NULL == ee)
+ {
+ ee = GNUNET_malloc (el.size + sizeof *ee);
+ ee->element.size = el.size;
+ GNUNET_memcpy (&ee[1],
+ el.data,
+ el.size);
+ ee->element.data = &ee[1];
+ ee->element.element_type = el.element_type;
+ ee->remote = GNUNET_NO;
+ ee->mutations = NULL;
+ ee->mutations_size = 0;
+ ee->element_hash = hash;
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_put (set->content->elements,
+ &ee->element_hash,
+ ee,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ }
+ else if (GNUNET_YES == _GSS_is_element_of_set (ee, set))
+ {
+ /* same element inserted twice */
+ return;
+ }
+
+ {
+ struct MutationEvent mut = {
+ .generation = set->current_generation,
+ .added = GNUNET_YES
+ };
+ GNUNET_array_append (ee->mutations, ee->mutations_size, mut);
+ }
+
+ set->vt->add (set->state, ee);
+}
+
+
+static void
+execute_remove (struct Set *set,
+ const struct GNUNET_MessageHeader *m)
+{
+ const struct GNUNET_SET_ElementMessage *msg;
+ struct GNUNET_SET_Element el;
+ struct ElementEntry *ee;
+ struct GNUNET_HashCode hash;
+
+ GNUNET_assert (GNUNET_MESSAGE_TYPE_SET_REMOVE == ntohs (m->type));
+
+ msg = (const struct GNUNET_SET_ElementMessage *) m;
+ el.size = ntohs (m->size) - sizeof *msg;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client removes element of size %u\n",
+ el.size);
+ el.data = &msg[1];
+ el.element_type = ntohs (msg->element_type);
+ GNUNET_SET_element_hash (&el, &hash);
+ ee = GNUNET_CONTAINER_multihashmap_get (set->content->elements,
+ &hash);
+ if (NULL == ee)
+ {
+ /* Client tried to remove non-existing element. */
+ return;
+ }
+ if (GNUNET_NO == _GSS_is_element_of_set (ee, set))
+ {
+ /* Client tried to remove element twice */
+ return;
+ }
+ else
+ {
+ struct MutationEvent mut = {
+ .generation = set->current_generation,
+ .added = GNUNET_NO
+ };
+ GNUNET_array_append (ee->mutations, ee->mutations_size, mut);
+ }
+ set->vt->remove (set->state, ee);
+}
+
+
+
+static void
+execute_mutation (struct Set *set,
+ const struct GNUNET_MessageHeader *m)
+{
+ switch (ntohs (m->type))
+ {
+ case GNUNET_MESSAGE_TYPE_SET_ADD:
+ execute_add (set, m);
+ break;
+ case GNUNET_MESSAGE_TYPE_SET_REMOVE:
+ execute_remove (set, m);
+ break;
+ default:
+ GNUNET_break (0);
+ }
+}
+
+
+
+/**
+ * Send the next element of a set to the set's client. The next element is given by
+ * the set's current hashmap iterator. The set's iterator will be set to NULL if there
+ * are no more elements in the set. The caller must ensure that the set's iterator is
+ * valid.
+ *
+ * The client will acknowledge each received element with a
+ * #GNUNET_MESSAGE_TYPE_SET_ITER_ACK message. Our
+ * #handle_client_iter_ack() will then trigger the next transmission.
+ * Note that the #GNUNET_MESSAGE_TYPE_SET_ITER_DONE is not acknowledged.
+ *
+ * @param set set that should send its next element to its client
+ */
+static void
+send_client_element (struct Set *set)
+{
+ int ret;
+ struct ElementEntry *ee;
+ struct GNUNET_MQ_Envelope *ev;
+ struct GNUNET_SET_IterResponseMessage *msg;
+
+ GNUNET_assert (NULL != set->iter);
+
+again:
+
+ ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter,
+ NULL,
+ (const void **) &ee);
+ if (GNUNET_NO == ret)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Iteration on %p done.\n",
+ (void *) set);
+ ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
+ GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
+ set->iter = NULL;
+ set->iteration_id++;
+
+ GNUNET_assert (set->content->iterator_count > 0);
+ set->content->iterator_count -= 1;
+
+ if (0 == set->content->iterator_count)
+ {
+ while (NULL != set->content->pending_mutations_head)
+ {
+ struct PendingMutation *pm;
+
+ pm = set->content->pending_mutations_head;
+ GNUNET_CONTAINER_DLL_remove (set->content->pending_mutations_head,
+ set->content->pending_mutations_tail,
+ pm);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Executing pending mutation on %p.\n",
+ (void *) pm->set);
+ execute_mutation (pm->set, pm->mutation_message);
+ GNUNET_free (pm->mutation_message);
+ GNUNET_free (pm);
+ }
+ }
+
+ }
+ else
+ {
+ GNUNET_assert (NULL != ee);
+
+ if (GNUNET_NO == is_element_of_iteration (ee, set))
+ goto again;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending iteration element on %p.\n",
+ (void *) set);
+ ev = GNUNET_MQ_msg_extra (msg,
+ ee->element.size,
+ GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
+ GNUNET_memcpy (&msg[1],
+ ee->element.data,
+ ee->element.size);
+ msg->element_type = htons (ee->element.element_type);
+ msg->iteration_id = htons (set->iteration_id);
+ }
+ GNUNET_MQ_send (set->client_mq, ev);
+}
+
+
+/**
+ * Called when a client wants to iterate the elements of a set.
+ * Checks if we have a set associated with the client and if we
+ * can right now start an iteration. If all checks out, starts
+ * sending the elements of the set to the client.
+ *
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
+ */
+static void
+handle_client_iterate (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
+{
+ struct Set *set;
+
+ set = set_get (client);
+ if (NULL == set)
+ {
+ /* attempt to iterate over a non existing set */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ if (NULL != set->iter)
+ {
+ /* Only one concurrent iterate-action allowed per set */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Iterating set %p in gen %u with %u content elements\n",
+ (void *) set,
+ set->current_generation,
+ GNUNET_CONTAINER_multihashmap_size (set->content->elements));
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+ set->content->iterator_count += 1;
+ set->iter = GNUNET_CONTAINER_multihashmap_iterator_create (set->content->elements);
+ set->iter_generation = set->current_generation;
+ send_client_element (set);
+}
+
+
+/**
+ * Called when a client wants to create a new set. This is typically
+ * the first request from a client, and includes the type of set
+ * operation to be performed.
+ *
+ * @param cls unused
+ * @param client client that sent the message
+ * @param m message sent by the client
+ */
+static void
+handle_client_create_set (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *m)
+{
+ const struct GNUNET_SET_CreateMessage *msg;
+ struct Set *set;
+
+ msg = (const struct GNUNET_SET_CreateMessage *) m;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Client created new set (operation %u)\n",
+ ntohl (msg->operation));
+ if (NULL != set_get (client))
+ {
+ /* There can only be one set per client */
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ set = GNUNET_new (struct Set);
+ switch (ntohl (msg->operation))
+ {
+ case GNUNET_SET_OPERATION_INTERSECTION:
+ set->vt = _GSS_intersection_vt ();
+ break;
+ case GNUNET_SET_OPERATION_UNION:
+ set->vt = _GSS_union_vt ();
+ break;
+ default:
+ GNUNET_free (set);
+ GNUNET_break (0);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ set->operation = ntohl (msg->operation);
+ set->state = set->vt->create ();
+ if (NULL == set->state)
+ {
+ /* initialization failed (i.e. out of memory) */
+ GNUNET_free (set);
+ GNUNET_SERVER_client_disconnect (client);
+ return;
+ }
+ set->content = GNUNET_new (struct SetContent);
+ set->content->refcount = 1;
+ set->content->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
+ set->client = client;
+ set->client_mq = GNUNET_MQ_queue_for_server_client (client);
+ GNUNET_CONTAINER_DLL_insert (sets_head,
+ sets_tail,
+ set);
+ GNUNET_SERVER_receive_done (client,
+ GNUNET_OK);
+}
+
+
+/**
+ * Timeout happens iff:
+ * - we suggested an operation to our listener,
+ * but did not receive a response in time
+ * - we got the channel from a peer but no #GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST
+ *
+ * @param cls channel context
+ * @param tc context information (why was this task triggered now)
+ */
+static void
+incoming_timeout_cb (void *cls)
+{
+ struct Operation *incoming = cls;
+
+ incoming->timeout_task = NULL;
+ GNUNET_assert (GNUNET_YES == incoming->is_incoming);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Remote peer's incoming request timed out\n");
+ incoming_destroy (incoming);
+}
+
+
+/**
+ * Terminates an incoming operation in case we have not yet received an
+ * operation request. Called by the channel destruction handler.
+ *
+ * @param op the channel context
+ */
+static void
+handle_incoming_disconnect (struct Operation *op)
+{
+ GNUNET_assert (GNUNET_YES == op->is_incoming);
+ /* channel is already dead, incoming_destroy must not
+ * destroy it ... */
+ op->channel = NULL;
+ incoming_destroy (op);
+ op->vt = NULL;
+}
+
+
+/**
+ * Method called whenever another peer has added us to a channel the
+ * other peer initiated. Only called (once) upon reception of data
+ * from a channel we listen on.
+ *
+ * The channel context represents the operation itself and gets added
+ * to a DLL, from where it gets looked up when our local listener
+ * client responds to a proposed/suggested operation or connects and
+ * associates with this operation.
+ *
+ * @param cls closure
+ * @param channel new handle to the channel
+ * @param initiator peer that started the channel
+ * @param port Port this channel is for.
+ * @param options Unused.
+ * @return initial channel context for the channel
+ * returns NULL on error
+ */
+static void *
+channel_new_cb (void *cls,
+ struct GNUNET_CADET_Channel *channel,
+ const struct GNUNET_PeerIdentity *initiator,
+ const struct GNUNET_HashCode *port,
+ enum GNUNET_CADET_ChannelOption options)
projects / oweals / gnunet.git / blobdiff