gnunet_rps_SOURCES = \
gnunet-service-rps_sampler_elem.h gnunet-service-rps_sampler_elem.c \
- gnunet-service-rps_sampler.h gnunet-service-rps_sampler.c \
+ rps-sampler_common.h rps-sampler_common.c \
gnunet-rps.c
gnunet_rps_LDADD = \
lib_LTLIBRARIES = libgnunetrps.la
libgnunetrps_la_SOURCES = \
+ rps-sampler_client.h rps-sampler_client.c \
rps_api.c rps.h
libgnunetrps_la_LIBADD = \
$(top_builddir)/src/util/libgnunetutil.la \
gnunet_service_rps_SOURCES = \
gnunet-service-rps_sampler_elem.h gnunet-service-rps_sampler_elem.c \
+ rps-sampler_common.h rps-sampler_common.c \
gnunet-service-rps_sampler.h gnunet-service-rps_sampler.c \
gnunet-service-rps_custommap.h gnunet-service-rps_custommap.c \
gnunet-service-rps_view.h gnunet-service-rps_view.c \
test_rps.c \
rps-test_util.h rps-test_util.c \
gnunet-service-rps_sampler_elem.h gnunet-service-rps_sampler_elem.c \
+ rps-sampler_common.h rps-sampler_common.c \
gnunet-service-rps_sampler.h gnunet-service-rps_sampler.c
ld_rps_test_lib = \
gnunet_rps_profiler_SOURCES = \
gnunet-service-rps_sampler_elem.h gnunet-service-rps_sampler_elem.c \
+ rps-sampler_common.h rps-sampler_common.c \
gnunet-service-rps_sampler.h gnunet-service-rps_sampler.c \
rps-test_util.h rps-test_util.c \
gnunet-rps-profiler.c
#include "gnunet_statistics_service.h"
#include "rps.h"
+#include "rps-sampler_common.h"
#include "gnunet-service-rps_sampler.h"
#include "gnunet-service-rps_sampler_elem.h"
// TODO care about invalid input of the caller (size 0 or less...)
-/**
- * Callback that is called from _get_rand_peer() when the PeerID is ready.
- *
- * @param cls the closure given alongside this function.
- * @param id the PeerID that was returned
- */
-typedef void
-(*RPS_sampler_rand_peer_ready_cont) (void *cls,
- const struct GNUNET_PeerIdentity *id);
-
-
/**
* @brief Callback called each time a new peer was put into the sampler
*
};
-/**
- * Closure for #sampler_mod_get_rand_peer() and #sampler_get_rand_peer
- */
-struct GetPeerCls
-{
- /**
- * DLL
- */
- struct GetPeerCls *next;
- struct GetPeerCls *prev;
-
- /**
- * The #RPS_SamplerRequestHandle this single request belongs to.
- */
- struct RPS_SamplerRequestHandle *req_handle;
-
- /**
- * The task for this function.
- */
- struct GNUNET_SCHEDULER_Task *get_peer_task;
-
- /**
- * @brief Context to the given callback.
- */
- struct SamplerNotifyUpdateCTX *notify_ctx;
-
- /**
- * The callback
- */
- RPS_sampler_rand_peer_ready_cont cont;
-
- /**
- * The closure to the callback @e cont
- */
- void *cont_cls;
-
- /**
- * The address of the id to be stored at
- */
- struct GNUNET_PeerIdentity *id;
-};
-
-
/**
* Type of function used to differentiate between modified and not modified
* Sampler.
sampler_get_rand_peer (void *cls);
-/**
- * Get one random peer out of the sampled peers.
- *
- * We might want to reinitialise this sampler after giving the
- * corrsponding peer to the client.
- */
-static void
-sampler_mod_get_rand_peer (void *cls);
-
-
-/**
- * Sampler with its own array of SamplerElements
- */
-struct RPS_Sampler
-{
- /**
- * Number of sampler elements we hold.
- */
- unsigned int sampler_size;
- //size_t size;
-
- /**
- * All sampler elements in one array.
- */
- struct RPS_SamplerElement **sampler_elements;
-
- /**
- * Maximum time a round takes
- *
- * Used in the context of RPS
- */
- struct GNUNET_TIME_Relative max_round_interval;
-
- /**
- * Stores the function to return peers. Which one it is depends on whether
- * the Sampler is the modified one or not.
- */
- RPS_get_peers_type get_peers;
-
- /**
- * Head and tail for the DLL to store the #RPS_SamplerRequestHandle
- */
- struct RPS_SamplerRequestHandle *req_handle_head;
- struct RPS_SamplerRequestHandle *req_handle_tail;
-
- struct SamplerNotifyUpdateCTX *notify_ctx_head;
- struct SamplerNotifyUpdateCTX *notify_ctx_tail;
- #ifdef TO_FILE
- /**
- * File name to log to
- */
- char *file_name;
- #endif /* TO_FILE */
-};
-
/**
* Closure to _get_n_rand_peers_ready_cb()
*/
static uint32_t client_get_index;
-/**
- * @brief Add a callback that will be called when the next peer is inserted
- * into the sampler
- *
- * @param sampler The sampler on which update it will be called
- * @param notify_cb The callback
- * @param cls Closure given to the callback
- *
- * @return The context containing callback and closure
- */
-struct SamplerNotifyUpdateCTX *
-sampler_notify_on_update (struct RPS_Sampler *sampler,
- SamplerNotifyUpdateCB notify_cb,
- void *cls)
-{
- struct SamplerNotifyUpdateCTX *notify_ctx;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Inserting new context for notification\n");
- notify_ctx = GNUNET_new (struct SamplerNotifyUpdateCTX);
- notify_ctx->notify_cb = notify_cb;
- notify_ctx->cls = cls;
- GNUNET_CONTAINER_DLL_insert (sampler->notify_ctx_head,
- sampler->notify_ctx_tail,
- notify_ctx);
- return notify_ctx;
-}
-
-
-/**
- * Callback to _get_rand_peer() used by _get_n_rand_peers().
- *
- * Checks whether all n peers are available. If they are,
- * give those back.
- */
-static void
-check_n_peers_ready (void *cls,
- const struct GNUNET_PeerIdentity *id)
-{
- struct RPS_SamplerRequestHandle *req_handle = cls;
- (void) id;
-
- req_handle->cur_num_peers++;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Got %" PRIX32 ". of %" PRIX32 " peers\n",
- req_handle->cur_num_peers, req_handle->num_peers);
-
- if (req_handle->num_peers == req_handle->cur_num_peers)
- { /* All peers are ready -- return those to the client */
- GNUNET_assert (NULL != req_handle->callback);
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "returning %" PRIX32 " peers to the client\n",
- req_handle->num_peers);
- req_handle->callback (req_handle->ids, req_handle->num_peers, req_handle->cls);
-
- RPS_sampler_request_cancel (req_handle);
- }
-}
-
-
-/**
- * Get the size of the sampler.
- *
- * @param sampler the sampler to return the size of.
- * @return the size of the sampler
- */
-unsigned int
-RPS_sampler_get_size (struct RPS_Sampler *sampler)
-{
- return sampler->sampler_size;
-}
-
-
-/**
- * Grow or shrink the size of the sampler.
- *
- * @param sampler the sampler to resize.
- * @param new_size the new size of the sampler
- */
-static void
-sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size)
-{
- unsigned int old_size;
- uint32_t i;
-
- // TODO check min and max size
-
- old_size = sampler->sampler_size;
-
- if (old_size > new_size)
- { /* Shrinking */
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Shrinking sampler %d -> %d\n",
- old_size,
- new_size);
-
- to_file (sampler->file_name,
- "Shrinking sampler %d -> %d",
- old_size,
- new_size);
-
- for (i = new_size ; i < old_size ; i++)
- {
- to_file (sampler->file_name,
- "-%" PRIu32 ": %s",
- i,
- sampler->sampler_elements[i]->file_name);
- RPS_sampler_elem_destroy (sampler->sampler_elements[i]);
- }
-
- GNUNET_array_grow (sampler->sampler_elements,
- sampler->sampler_size,
- new_size);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "sampler->sampler_elements now points to %p\n",
- sampler->sampler_elements);
-
- }
- else if (old_size < new_size)
- { /* Growing */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Growing sampler %d -> %d\n",
- old_size,
- new_size);
-
- to_file (sampler->file_name,
- "Growing sampler %d -> %d",
- old_size,
- new_size);
-
- GNUNET_array_grow (sampler->sampler_elements,
- sampler->sampler_size,
- new_size);
-
- for (i = old_size ; i < new_size ; i++)
- { /* Add new sampler elements */
- sampler->sampler_elements[i] = RPS_sampler_elem_create ();
-
- to_file (sampler->file_name,
- "+%" PRIu32 ": %s",
- i,
- sampler->sampler_elements[i]->file_name);
- }
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Size remains the same -- nothing to do\n");
- return;
- }
-
- GNUNET_assert (sampler->sampler_size == new_size);
-}
-
-
-/**
- * Grow or shrink the size of the sampler.
- *
- * @param sampler the sampler to resize.
- * @param new_size the new size of the sampler
- */
-void
-RPS_sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size)
-{
- GNUNET_assert (0 < new_size);
- sampler_resize (sampler, new_size);
-}
-
-
-/**
- * Empty the sampler.
- *
- * @param sampler the sampler to empty.
- * @param new_size the new size of the sampler
- */
-static void
-sampler_empty (struct RPS_Sampler *sampler)
-{
- sampler_resize (sampler, 0);
-}
-
-
/**
* Initialise a tuple of sampler elements.
*
return sampler;
}
-/**
- * Initialise a modified tuple of sampler elements.
- *
- * @param init_size the size the sampler is initialised with
- * @param max_round_interval maximum time a round takes
- * @return a handle to a sampler that consists of sampler elements.
- */
-struct RPS_Sampler *
-RPS_sampler_mod_init (size_t init_size,
- struct GNUNET_TIME_Relative max_round_interval)
-{
- struct RPS_Sampler *sampler;
-
- sampler = RPS_sampler_init (init_size, max_round_interval);
- sampler->get_peers = sampler_mod_get_rand_peer;
-
-#ifdef TO_FILE
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Initialised modified sampler %s\n",
- sampler->file_name);
- to_file (sampler->file_name,
- "This is a modified sampler");
-#endif /* TO_FILE */
-
- return sampler;
-}
-
-
-/**
- * @brief Notify about update of the sampler.
- *
- * Call the callbacks that are waiting for notification on updates to the
- * sampler.
- *
- * @param sampler The sampler the updates are waiting for
- */
-static void
-notify_update (struct RPS_Sampler *sampler)
-{
- struct SamplerNotifyUpdateCTX *tmp_notify_head;
- struct SamplerNotifyUpdateCTX *tmp_notify_tail;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Calling callbacks waiting for update notification.\n");
- tmp_notify_head = sampler->notify_ctx_head;
- tmp_notify_tail = sampler->notify_ctx_tail;
- sampler->notify_ctx_head = NULL;
- sampler->notify_ctx_tail = NULL;
- for (struct SamplerNotifyUpdateCTX *notify_iter = tmp_notify_head;
- NULL != tmp_notify_head;
- notify_iter = tmp_notify_head)
- {
- GNUNET_assert (NULL != notify_iter->notify_cb);
- GNUNET_CONTAINER_DLL_remove (tmp_notify_head,
- tmp_notify_tail,
- notify_iter);
- notify_iter->notify_cb (notify_iter->cls);
- GNUNET_free (notify_iter);
- }
-}
-
-
-/**
- * Update every sampler element of this sampler with given peer
- *
- * @param sampler the sampler to update.
- * @param id the PeerID that is put in the sampler
- */
- void
-RPS_sampler_update (struct RPS_Sampler *sampler,
- const struct GNUNET_PeerIdentity *id)
-{
- to_file (sampler->file_name,
- "Got %s",
- GNUNET_i2s_full (id));
-
- for (uint32_t i = 0; i < sampler->sampler_size; i++)
- {
- RPS_sampler_elem_next (sampler->sampler_elements[i],
- id);
- }
- notify_update (sampler);
-}
-
-
-/**
- * Reinitialise all previously initialised sampler elements with the given value.
- *
- * Used to get rid of a PeerID.
- *
- * @param sampler the sampler to reinitialise a sampler element in.
- * @param id the id of the sampler elements to update.
- */
- void
-RPS_sampler_reinitialise_by_value (struct RPS_Sampler *sampler,
- const struct GNUNET_PeerIdentity *id)
-{
- uint32_t i;
-
- for (i = 0; i < sampler->sampler_size; i++)
- {
- if (0 == GNUNET_CRYPTO_cmp_peer_identity(id,
- &(sampler->sampler_elements[i]->peer_id)) )
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Reinitialising sampler\n");
- to_file (sampler->sampler_elements[i]->file_name,
- "--- non-active");
- RPS_sampler_elem_reinit (sampler->sampler_elements[i]);
- }
- }
-}
-
-
/**
* Get one random peer out of the sampled peers.
*
gpc->notify_ctx =
sampler_notify_on_update (sampler,
- &sampler_mod_get_rand_peer,
+ &sampler_get_rand_peer,
gpc);
return;
}
}
-/**
- * Get one random peer out of the sampled peers.
- *
- * This reinitialises the queried sampler element.
- */
-static void
-sampler_mod_get_rand_peer (void *cls)
-{
- struct GetPeerCls *gpc = cls;
- struct RPS_SamplerElement *s_elem;
- struct GNUNET_TIME_Relative last_request_diff;
- struct RPS_Sampler *sampler;
-
- gpc->get_peer_task = NULL;
- gpc->notify_ctx = NULL;
- sampler = gpc->req_handle->sampler;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Single peer was requested\n");
-
- /* Cycle the #client_get_index one step further */
- client_get_index = (client_get_index + 1) % sampler->sampler_size;
-
- s_elem = sampler->sampler_elements[client_get_index];
- *gpc->id = s_elem->peer_id;
- GNUNET_assert (NULL != s_elem);
-
- if (EMPTY == s_elem->is_empty)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Sampler_mod element empty, rescheduling.\n");
- GNUNET_assert (NULL == gpc->notify_ctx);
- gpc->notify_ctx =
- sampler_notify_on_update (sampler,
- &sampler_mod_get_rand_peer,
- gpc);
- return;
- }
-
- /* Check whether we may use this sampler to give it back to the client */
- if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us != s_elem->last_client_request.abs_value_us)
- {
- // TODO remove this condition at least for the client sampler
- last_request_diff =
- GNUNET_TIME_absolute_get_difference (s_elem->last_client_request,
- GNUNET_TIME_absolute_get ());
- /* We're not going to give it back now if it was
- * already requested by a client this round */
- if (last_request_diff.rel_value_us < sampler->max_round_interval.rel_value_us)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Last client request on this sampler was less than max round interval ago -- scheduling for later\n");
- ///* How many time remains untile the next round has started? */
- //inv_last_request_diff =
- // GNUNET_TIME_absolute_get_difference (last_request_diff,
- // sampler->max_round_interval);
- // add a little delay
- /* Schedule it one round later */
- GNUNET_assert (NULL == gpc->notify_ctx);
- gpc->notify_ctx =
- sampler_notify_on_update (sampler,
- &sampler_mod_get_rand_peer,
- gpc);
- return;
- }
- }
- if (2 > s_elem->num_peers)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "This s_elem saw less than two peers -- scheduling for later\n");
- GNUNET_assert (NULL == gpc->notify_ctx);
- gpc->notify_ctx =
- sampler_notify_on_update (sampler,
- &sampler_mod_get_rand_peer,
- gpc);
- return;
- }
- /* More reasons to wait could be added here */
-
-// GNUNET_STATISTICS_set (stats,
-// "# client sampler element input",
-// s_elem->num_peers,
-// GNUNET_NO);
-// GNUNET_STATISTICS_set (stats,
-// "# client sampler element change",
-// s_elem->num_change,
-// GNUNET_NO);
-
- RPS_sampler_elem_reinit (s_elem);
- s_elem->last_client_request = GNUNET_TIME_absolute_get ();
-
- GNUNET_CONTAINER_DLL_remove (gpc->req_handle->gpc_head,
- gpc->req_handle->gpc_tail,
- gpc);
- gpc->cont (gpc->cont_cls, gpc->id);
- GNUNET_free (gpc);
-}
-
-
-/**
- * Get n random peers out of the sampled peers.
- *
- * We might want to reinitialise this sampler after giving the
- * corrsponding peer to the client.
- * Random with or without consumption?
- *
- * @param sampler the sampler to get peers from.
- * @param cb callback that will be called once the ids are ready.
- * @param cls closure given to @a cb
- * @param for_client #GNUNET_YES if result is used for client,
- * #GNUNET_NO if used internally
- * @param num_peers the number of peers requested
- */
-struct RPS_SamplerRequestHandle *
-RPS_sampler_get_n_rand_peers (struct RPS_Sampler *sampler,
- uint32_t num_peers,
- RPS_sampler_n_rand_peers_ready_cb cb,
- void *cls)
-{
- uint32_t i;
- struct RPS_SamplerRequestHandle *req_handle;
- struct GetPeerCls *gpc;
-
- GNUNET_assert (0 != sampler->sampler_size);
- if (0 == num_peers)
- return NULL;
-
- // TODO check if we have too much (distinct) sampled peers
- req_handle = GNUNET_new (struct RPS_SamplerRequestHandle);
- req_handle->num_peers = num_peers;
- req_handle->cur_num_peers = 0;
- req_handle->ids = GNUNET_new_array (num_peers, struct GNUNET_PeerIdentity);
- req_handle->sampler = sampler;
- req_handle->callback = cb;
- req_handle->cls = cls;
- GNUNET_CONTAINER_DLL_insert (sampler->req_handle_head,
- sampler->req_handle_tail,
- req_handle);
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling requests for %" PRIu32 " peers\n", num_peers);
-
- for (i = 0; i < num_peers; i++)
- {
- gpc = GNUNET_new (struct GetPeerCls);
- gpc->req_handle = req_handle;
- gpc->cont = check_n_peers_ready;
- gpc->cont_cls = req_handle;
- gpc->id = &req_handle->ids[i];
-
- GNUNET_CONTAINER_DLL_insert (req_handle->gpc_head,
- req_handle->gpc_tail,
- gpc);
- // maybe add a little delay
- gpc->get_peer_task = GNUNET_SCHEDULER_add_now (sampler->get_peers,
- gpc);
- }
- return req_handle;
-}
-
-/**
- * Cancle a request issued through #RPS_sampler_n_rand_peers_ready_cb.
- *
- * @param req_handle the handle to the request
- */
-void
-RPS_sampler_request_cancel (struct RPS_SamplerRequestHandle *req_handle)
-{
- struct GetPeerCls *i;
-
- while (NULL != (i = req_handle->gpc_head) )
- {
- GNUNET_CONTAINER_DLL_remove (req_handle->gpc_head,
- req_handle->gpc_tail,
- i);
- if (NULL != i->get_peer_task)
- {
- GNUNET_SCHEDULER_cancel (i->get_peer_task);
- }
- if (NULL != i->notify_ctx)
- {
- GNUNET_CONTAINER_DLL_remove (req_handle->sampler->notify_ctx_head,
- req_handle->sampler->notify_ctx_tail,
- i->notify_ctx);
- GNUNET_free (i->notify_ctx);
- }
- GNUNET_free (i);
- }
- GNUNET_free (req_handle->ids);
- GNUNET_CONTAINER_DLL_remove (req_handle->sampler->req_handle_head,
- req_handle->sampler->req_handle_tail,
- req_handle);
- GNUNET_free (req_handle);
-}
-
-
-/**
- * Counts how many Samplers currently hold a given PeerID.
- *
- * @param sampler the sampler to count ids in.
- * @param id the PeerID to count.
- *
- * @return the number of occurrences of id.
- */
- uint32_t
-RPS_sampler_count_id (struct RPS_Sampler *sampler,
- const struct GNUNET_PeerIdentity *id)
-{
- uint32_t count;
- uint32_t i;
-
- count = 0;
- for ( i = 0 ; i < sampler->sampler_size ; i++ )
- {
- if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&sampler->sampler_elements[i]->peer_id, id)
- && EMPTY != sampler->sampler_elements[i]->is_empty)
- count++;
- }
- return count;
-}
-
-
-/**
- * Cleans the sampler.
- */
- void
-RPS_sampler_destroy (struct RPS_Sampler *sampler)
-{
- if (NULL != sampler->req_handle_head)
- {
- LOG (GNUNET_ERROR_TYPE_WARNING,
- "There are still pending requests. Going to remove them.\n");
- while (NULL != sampler->req_handle_head)
- {
- RPS_sampler_request_cancel (sampler->req_handle_head);
- }
- }
- sampler_empty (sampler);
- GNUNET_free (sampler);
-}
-
/* end of gnunet-service-rps.c */
#ifndef RPS_SAMPLER_H
#define RPS_SAMPLER_H
#include <inttypes.h>
+#include "rps-sampler_common.h"
/**
struct RPS_SamplerRequestHandle;
-/**
- * Callback that is called from _get_n_rand_peers() when the PeerIDs are ready.
- *
- * @param cls the closure given alongside this function.
- * @param ids the PeerIDs that were returned
- * to be freed
- */
- typedef void
-(*RPS_sampler_n_rand_peers_ready_cb) (const struct GNUNET_PeerIdentity *ids,
- uint32_t num_peers,
- void *cls);
-
-
/**
* Get the size of the sampler.
*
struct GNUNET_TIME_Relative max_round_interval);
-/**
- * Initialise a modified tuple of sampler elements.
- *
- * @param init_size the size the sampler is initialised with
- * @param max_round_interval maximum time a round takes
- * @return a handle to a sampler that consists of sampler elements.
- */
-struct RPS_Sampler *
-RPS_sampler_mod_init (size_t init_size,
- struct GNUNET_TIME_Relative max_round_interval);
-
-
/**
* Update every sampler element of this sampler with given peer
*
--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C)
+
+ 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/>.
+*/
+
+/**
+ * @file rps/gnunet-service-rps_sampler.c
+ * @brief sampler implementation
+ * @author Julius Bünger
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+#include "rps.h"
+
+#include "rps-sampler_common.h"
+#include "gnunet-service-rps_sampler.h"
+#include "gnunet-service-rps_sampler_elem.h"
+
+#include <math.h>
+#include <inttypes.h>
+
+#include "rps-test_util.h"
+
+#define LOG(kind, ...) GNUNET_log_from(kind,"rps-sampler",__VA_ARGS__)
+
+
+// multiple 'clients'?
+
+// TODO check for overflows
+
+// TODO align message structs
+
+// hist_size_init, hist_size_max
+
+/***********************************************************************
+ * WARNING: This section needs to be reviewed regarding the use of
+ * functions providing (pseudo)randomness!
+***********************************************************************/
+
+// TODO care about invalid input of the caller (size 0 or less...)
+
+/**
+ * @brief Callback called each time a new peer was put into the sampler
+ *
+ * @param cls A possibly given closure
+ */
+typedef void
+(*SamplerNotifyUpdateCB) (void *cls);
+
+/**
+ * @brief Context for a callback. Contains callback and closure.
+ *
+ * Meant to be an entry in an DLL.
+ */
+struct SamplerNotifyUpdateCTX
+{
+ /**
+ * @brief The Callback to call on updates
+ */
+ SamplerNotifyUpdateCB notify_cb;
+
+ /**
+ * @brief The according closure.
+ */
+ void *cls;
+
+ /**
+ * @brief Next element in DLL.
+ */
+ struct SamplerNotifyUpdateCTX *next;
+
+ /**
+ * @brief Previous element in DLL.
+ */
+ struct SamplerNotifyUpdateCTX *prev;
+};
+
+
+/**
+ * Type of function used to differentiate between modified and not modified
+ * Sampler.
+ */
+typedef void
+(*RPS_get_peers_type) (void *cls);
+
+
+/**
+ * Get one random peer out of the sampled peers.
+ *
+ * We might want to reinitialise this sampler after giving the
+ * corrsponding peer to the client.
+ */
+static void
+sampler_mod_get_rand_peer (void *cls);
+
+
+/**
+ * Closure to _get_n_rand_peers_ready_cb()
+ */
+struct RPS_SamplerRequestHandle
+{
+ /**
+ * DLL
+ */
+ struct RPS_SamplerRequestHandle *next;
+ struct RPS_SamplerRequestHandle *prev;
+
+ /**
+ * Number of peers we are waiting for.
+ */
+ uint32_t num_peers;
+
+ /**
+ * Number of peers we currently have.
+ */
+ uint32_t cur_num_peers;
+
+ /**
+ * Pointer to the array holding the ids.
+ */
+ struct GNUNET_PeerIdentity *ids;
+
+ /**
+ * Head and tail for the DLL to store the tasks for single requests
+ */
+ struct GetPeerCls *gpc_head;
+ struct GetPeerCls *gpc_tail;
+
+ /**
+ * Sampler.
+ */
+ struct RPS_Sampler *sampler;
+
+ /**
+ * Callback to be called when all ids are available.
+ */
+ RPS_sampler_n_rand_peers_ready_cb callback;
+
+ /**
+ * Closure given to the callback
+ */
+ void *cls;
+};
+
+///**
+// * Global sampler variable.
+// */
+//struct RPS_Sampler *sampler;
+
+
+/**
+ * The minimal size for the extended sampler elements.
+ */
+static size_t min_size;
+
+/**
+ * The maximal size the extended sampler elements should grow to.
+ */
+static size_t max_size;
+
+/**
+ * The size the extended sampler elements currently have.
+ */
+//static size_t extra_size;
+
+/**
+ * Inedex to the sampler element that is the next to be returned
+ */
+static uint32_t client_get_index;
+
+
+/**
+ * Initialise a modified tuple of sampler elements.
+ *
+ * @param init_size the size the sampler is initialised with
+ * @param max_round_interval maximum time a round takes
+ * @return a handle to a sampler that consists of sampler elements.
+ */
+struct RPS_Sampler *
+RPS_sampler_mod_init (size_t init_size,
+ struct GNUNET_TIME_Relative max_round_interval)
+{
+ struct RPS_Sampler *sampler;
+
+ /* Initialise context around extended sampler */
+ min_size = 10; // TODO make input to _samplers_init()
+ max_size = 1000; // TODO make input to _samplers_init()
+
+ sampler = GNUNET_new (struct RPS_Sampler);
+
+ sampler->max_round_interval = max_round_interval;
+ sampler->get_peers = sampler_mod_get_rand_peer;
+ //sampler->sampler_elements = GNUNET_new_array(init_size, struct GNUNET_PeerIdentity);
+ //GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, min_size);
+ RPS_sampler_resize (sampler, init_size);
+
+ client_get_index = 0;
+
+ //GNUNET_assert (init_size == sampler->sampler_size);
+
+#ifdef TO_FILE
+ sampler->file_name = create_file ("sampler-");
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Initialised modified sampler %s\n",
+ sampler->file_name);
+ to_file (sampler->file_name,
+ "This is a modified sampler");
+#endif /* TO_FILE */
+
+ return sampler;
+}
+
+
+/**
+ * Get one random peer out of the sampled peers.
+ *
+ * This reinitialises the queried sampler element.
+ */
+static void
+sampler_mod_get_rand_peer (void *cls)
+{
+ struct GetPeerCls *gpc = cls;
+ struct RPS_SamplerElement *s_elem;
+ struct GNUNET_TIME_Relative last_request_diff;
+ struct RPS_Sampler *sampler;
+
+ gpc->get_peer_task = NULL;
+ gpc->notify_ctx = NULL;
+ sampler = gpc->req_handle->sampler;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Single peer was requested\n");
+
+ /* Cycle the #client_get_index one step further */
+ client_get_index = (client_get_index + 1) % sampler->sampler_size;
+
+ s_elem = sampler->sampler_elements[client_get_index];
+ *gpc->id = s_elem->peer_id;
+ GNUNET_assert (NULL != s_elem);
+
+ if (EMPTY == s_elem->is_empty)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sampler_mod element empty, rescheduling.\n");
+ GNUNET_assert (NULL == gpc->notify_ctx);
+ gpc->notify_ctx =
+ sampler_notify_on_update (sampler,
+ &sampler_mod_get_rand_peer,
+ gpc);
+ return;
+ }
+
+ /* Check whether we may use this sampler to give it back to the client */
+ if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us != s_elem->last_client_request.abs_value_us)
+ {
+ // TODO remove this condition at least for the client sampler
+ last_request_diff =
+ GNUNET_TIME_absolute_get_difference (s_elem->last_client_request,
+ GNUNET_TIME_absolute_get ());
+ /* We're not going to give it back now if it was
+ * already requested by a client this round */
+ if (last_request_diff.rel_value_us < sampler->max_round_interval.rel_value_us)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Last client request on this sampler was less than max round interval ago -- scheduling for later\n");
+ ///* How many time remains untile the next round has started? */
+ //inv_last_request_diff =
+ // GNUNET_TIME_absolute_get_difference (last_request_diff,
+ // sampler->max_round_interval);
+ // add a little delay
+ /* Schedule it one round later */
+ GNUNET_assert (NULL == gpc->notify_ctx);
+ gpc->notify_ctx =
+ sampler_notify_on_update (sampler,
+ &sampler_mod_get_rand_peer,
+ gpc);
+ return;
+ }
+ }
+ if (2 > s_elem->num_peers)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "This s_elem saw less than two peers -- scheduling for later\n");
+ GNUNET_assert (NULL == gpc->notify_ctx);
+ gpc->notify_ctx =
+ sampler_notify_on_update (sampler,
+ &sampler_mod_get_rand_peer,
+ gpc);
+ return;
+ }
+ /* More reasons to wait could be added here */
+
+// GNUNET_STATISTICS_set (stats,
+// "# client sampler element input",
+// s_elem->num_peers,
+// GNUNET_NO);
+// GNUNET_STATISTICS_set (stats,
+// "# client sampler element change",
+// s_elem->num_change,
+// GNUNET_NO);
+
+ RPS_sampler_elem_reinit (s_elem);
+ s_elem->last_client_request = GNUNET_TIME_absolute_get ();
+
+ GNUNET_CONTAINER_DLL_remove (gpc->req_handle->gpc_head,
+ gpc->req_handle->gpc_tail,
+ gpc);
+ gpc->cont (gpc->cont_cls, gpc->id);
+ GNUNET_free (gpc);
+}
+
+
+/* end of gnunet-service-rps.c */
+
--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C)
+
+ 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/>.
+*/
+
+/**
+ * @file rps/rps-sampler_client.h
+ * @brief client sampler implementation
+ * @author Julius Bünger
+ */
+
+#ifndef RPS_SAMPLER_CLIENT_H
+#define RPS_SAMPLER_CLIENT_H
+#include <inttypes.h>
+#include "rps-sampler_common.h"
+
+
+/**
+ * A sampler sampling a stream of PeerIDs.
+ */
+struct RPS_Sampler;
+
+/**
+ * A handle to cancel a request.
+ */
+struct RPS_SamplerRequestHandle;
+
+
+/**
+ * Get the size of the sampler.
+ *
+ * @param sampler the sampler to return the size of.
+ * @return the size of the sampler
+ */
+unsigned int
+RPS_sampler_get_size (struct RPS_Sampler *sampler);
+
+
+/**
+ * Grow or shrink the size of the sampler.
+ *
+ * @param sampler the sampler to resize.
+ * @param new_size the new size of the sampler (not 0)
+ */
+void
+RPS_sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size);
+
+
+/**
+ * Initialise a modified tuple of sampler elements.
+ *
+ * @param init_size the size the sampler is initialised with
+ * @param max_round_interval maximum time a round takes
+ * @return a handle to a sampler that consists of sampler elements.
+ */
+struct RPS_Sampler *
+RPS_sampler_mod_init (size_t init_size,
+ struct GNUNET_TIME_Relative max_round_interval);
+
+
+/**
+ * Update every sampler element of this sampler with given peer
+ *
+ * @param sampler the sampler to update.
+ * @param id the PeerID that is put in the sampler
+ */
+ void
+RPS_sampler_update (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Reinitialise all previously initialised sampler elements with the given
+ * value.
+ *
+ * Used to get rid of a PeerID.
+ *
+ * @param sampler the sampler to reinitialise a sampler in.
+ * @param id the id of the samplers to update.
+ */
+ void
+RPS_sampler_reinitialise_by_value (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Get n random peers out of the sampled peers.
+ *
+ * We might want to reinitialise this sampler after giving the
+ * corrsponding peer to the client.
+ * Random with or without consumption?
+ *
+ * @param sampler the sampler to get peers from.
+ * @param cb callback that will be called once the ids are ready.
+ * @param cls closure given to @a cb
+ * @param for_client #GNUNET_YES if result is used for client,
+ * #GNUNET_NO if used internally
+ * @param num_peers the number of peers requested
+ */
+struct RPS_SamplerRequestHandle *
+RPS_sampler_get_n_rand_peers (struct RPS_Sampler *sampler,
+ uint32_t num_peers,
+ RPS_sampler_n_rand_peers_ready_cb cb,
+ void *cls);
+
+/**
+ * Cancle a request issued through #RPS_sampler_n_rand_peers_ready_cb.
+ *
+ * @param req_handle the handle to the request
+ */
+void
+RPS_sampler_request_cancel (struct RPS_SamplerRequestHandle *req_handle);
+
+
+/**
+ * Counts how many Samplers currently hold a given PeerID.
+ *
+ * @param sampler the sampler to cound ids in.
+ * @param id the PeerID to count.
+ *
+ * @return the number of occurrences of id.
+ */
+ uint32_t
+RPS_sampler_count_id (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Cleans the samplers.
+ *
+ * @param sampler the sampler to destroy.
+ */
+ void
+RPS_sampler_destroy (struct RPS_Sampler *sampler);
+
+#endif /* RPS_SAMPLER_CLIENT_H */
+/* end of gnunet-service-rps.c */
--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C)
+
+ 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/>.
+*/
+
+/**
+ * @file rps/rps-sampler_common.c
+ * @brief Code common to client and service sampler
+ * @author Julius Bünger
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+
+#include "rps-sampler_common.h"
+#include "gnunet-service-rps_sampler_elem.h"
+
+#include <math.h>
+#include <inttypes.h>
+
+#include "rps-test_util.h"
+
+#define LOG(kind, ...) GNUNET_log_from(kind,"rps-sampler_common",__VA_ARGS__)
+
+/**
+ * @brief Context for a callback. Contains callback and closure.
+ *
+ * Meant to be an entry in an DLL.
+ */
+struct SamplerNotifyUpdateCTX
+{
+ /**
+ * @brief The Callback to call on updates
+ */
+ SamplerNotifyUpdateCB notify_cb;
+
+ /**
+ * @brief The according closure.
+ */
+ void *cls;
+
+ /**
+ * @brief Next element in DLL.
+ */
+ struct SamplerNotifyUpdateCTX *next;
+
+ /**
+ * @brief Previous element in DLL.
+ */
+ struct SamplerNotifyUpdateCTX *prev;
+};
+
+
+/**
+ * Closure to _get_n_rand_peers_ready_cb()
+ */
+struct RPS_SamplerRequestHandle
+{
+ /**
+ * DLL
+ */
+ struct RPS_SamplerRequestHandle *next;
+ struct RPS_SamplerRequestHandle *prev;
+
+ /**
+ * Number of peers we are waiting for.
+ */
+ uint32_t num_peers;
+
+ /**
+ * Number of peers we currently have.
+ */
+ uint32_t cur_num_peers;
+
+ /**
+ * Pointer to the array holding the ids.
+ */
+ struct GNUNET_PeerIdentity *ids;
+
+ /**
+ * Head and tail for the DLL to store the tasks for single requests
+ */
+ struct GetPeerCls *gpc_head;
+ struct GetPeerCls *gpc_tail;
+
+ /**
+ * Sampler.
+ */
+ struct RPS_Sampler *sampler;
+
+ /**
+ * Callback to be called when all ids are available.
+ */
+ RPS_sampler_n_rand_peers_ready_cb callback;
+
+ /**
+ * Closure given to the callback
+ */
+ void *cls;
+};
+
+
+/**
+ * @brief Add a callback that will be called when the next peer is inserted
+ * into the sampler
+ *
+ * @param sampler The sampler on which update it will be called
+ * @param notify_cb The callback
+ * @param cls Closure given to the callback
+ *
+ * @return The context containing callback and closure
+ */
+struct SamplerNotifyUpdateCTX *
+sampler_notify_on_update (struct RPS_Sampler *sampler,
+ SamplerNotifyUpdateCB notify_cb,
+ void *cls)
+{
+ struct SamplerNotifyUpdateCTX *notify_ctx;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Inserting new context for notification\n");
+ notify_ctx = GNUNET_new (struct SamplerNotifyUpdateCTX);
+ notify_ctx->notify_cb = notify_cb;
+ notify_ctx->cls = cls;
+ GNUNET_CONTAINER_DLL_insert (sampler->notify_ctx_head,
+ sampler->notify_ctx_tail,
+ notify_ctx);
+ return notify_ctx;
+}
+
+
+/**
+ * Get the size of the sampler.
+ *
+ * @param sampler the sampler to return the size of.
+ * @return the size of the sampler
+ */
+unsigned int
+RPS_sampler_get_size (struct RPS_Sampler *sampler)
+{
+ return sampler->sampler_size;
+}
+
+
+/**
+ * @brief Notify about update of the sampler.
+ *
+ * Call the callbacks that are waiting for notification on updates to the
+ * sampler.
+ *
+ * @param sampler The sampler the updates are waiting for
+ */
+static void
+notify_update (struct RPS_Sampler *sampler)
+{
+ struct SamplerNotifyUpdateCTX *tmp_notify_head;
+ struct SamplerNotifyUpdateCTX *tmp_notify_tail;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling callbacks waiting for update notification.\n");
+ tmp_notify_head = sampler->notify_ctx_head;
+ tmp_notify_tail = sampler->notify_ctx_tail;
+ sampler->notify_ctx_head = NULL;
+ sampler->notify_ctx_tail = NULL;
+ for (struct SamplerNotifyUpdateCTX *notify_iter = tmp_notify_head;
+ NULL != tmp_notify_head;
+ notify_iter = tmp_notify_head)
+ {
+ GNUNET_assert (NULL != notify_iter->notify_cb);
+ GNUNET_CONTAINER_DLL_remove (tmp_notify_head,
+ tmp_notify_tail,
+ notify_iter);
+ notify_iter->notify_cb (notify_iter->cls);
+ GNUNET_free (notify_iter);
+ }
+}
+
+
+/**
+ * Update every sampler element of this sampler with given peer
+ *
+ * @param sampler the sampler to update.
+ * @param id the PeerID that is put in the sampler
+ */
+ void
+RPS_sampler_update (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
+{
+ to_file (sampler->file_name,
+ "Got %s",
+ GNUNET_i2s_full (id));
+
+ for (uint32_t i = 0; i < sampler->sampler_size; i++)
+ {
+ RPS_sampler_elem_next (sampler->sampler_elements[i],
+ id);
+ }
+ notify_update (sampler);
+}
+
+
+/**
+ * Reinitialise all previously initialised sampler elements with the given value.
+ *
+ * Used to get rid of a PeerID.
+ *
+ * @param sampler the sampler to reinitialise a sampler element in.
+ * @param id the id of the sampler elements to update.
+ */
+ void
+RPS_sampler_reinitialise_by_value (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
+{
+ uint32_t i;
+
+ for (i = 0; i < sampler->sampler_size; i++)
+ {
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity(id,
+ &(sampler->sampler_elements[i]->peer_id)) )
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Reinitialising sampler\n");
+ to_file (sampler->sampler_elements[i]->file_name,
+ "--- non-active");
+ RPS_sampler_elem_reinit (sampler->sampler_elements[i]);
+ }
+ }
+}
+
+
+/**
+ * Counts how many Samplers currently hold a given PeerID.
+ *
+ * @param sampler the sampler to count ids in.
+ * @param id the PeerID to count.
+ *
+ * @return the number of occurrences of id.
+ */
+ uint32_t
+RPS_sampler_count_id (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
+{
+ uint32_t count;
+ uint32_t i;
+
+ count = 0;
+ for ( i = 0 ; i < sampler->sampler_size ; i++ )
+ {
+ if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&sampler->sampler_elements[i]->peer_id, id)
+ && EMPTY != sampler->sampler_elements[i]->is_empty)
+ count++;
+ }
+ return count;
+}
+
+
+/**
+ * Grow or shrink the size of the sampler.
+ *
+ * @param sampler the sampler to resize.
+ * @param new_size the new size of the sampler
+ */
+static void
+sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size)
+{
+ unsigned int old_size;
+ uint32_t i;
+
+ // TODO check min and max size
+
+ old_size = sampler->sampler_size;
+
+ if (old_size > new_size)
+ { /* Shrinking */
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Shrinking sampler %d -> %d\n",
+ old_size,
+ new_size);
+
+ to_file (sampler->file_name,
+ "Shrinking sampler %d -> %d",
+ old_size,
+ new_size);
+
+ for (i = new_size ; i < old_size ; i++)
+ {
+ to_file (sampler->file_name,
+ "-%" PRIu32 ": %s",
+ i,
+ sampler->sampler_elements[i]->file_name);
+ RPS_sampler_elem_destroy (sampler->sampler_elements[i]);
+ }
+
+ GNUNET_array_grow (sampler->sampler_elements,
+ sampler->sampler_size,
+ new_size);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "sampler->sampler_elements now points to %p\n",
+ sampler->sampler_elements);
+
+ }
+ else if (old_size < new_size)
+ { /* Growing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Growing sampler %d -> %d\n",
+ old_size,
+ new_size);
+
+ to_file (sampler->file_name,
+ "Growing sampler %d -> %d",
+ old_size,
+ new_size);
+
+ GNUNET_array_grow (sampler->sampler_elements,
+ sampler->sampler_size,
+ new_size);
+
+ for (i = old_size ; i < new_size ; i++)
+ { /* Add new sampler elements */
+ sampler->sampler_elements[i] = RPS_sampler_elem_create ();
+
+ to_file (sampler->file_name,
+ "+%" PRIu32 ": %s",
+ i,
+ sampler->sampler_elements[i]->file_name);
+ }
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Size remains the same -- nothing to do\n");
+ return;
+ }
+
+ GNUNET_assert (sampler->sampler_size == new_size);
+}
+
+
+/**
+ * Grow or shrink the size of the sampler.
+ *
+ * @param sampler the sampler to resize.
+ * @param new_size the new size of the sampler
+ */
+void
+RPS_sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size)
+{
+ GNUNET_assert (0 < new_size);
+ sampler_resize (sampler, new_size);
+}
+
+
+/**
+ * Empty the sampler.
+ *
+ * @param sampler the sampler to empty.
+ * @param new_size the new size of the sampler
+ */
+static void
+sampler_empty (struct RPS_Sampler *sampler)
+{
+ sampler_resize (sampler, 0);
+}
+
+
+/**
+ * Callback to _get_rand_peer() used by _get_n_rand_peers().
+ *
+ * Checks whether all n peers are available. If they are,
+ * give those back.
+ */
+static void
+check_n_peers_ready (void *cls,
+ const struct GNUNET_PeerIdentity *id)
+{
+ struct RPS_SamplerRequestHandle *req_handle = cls;
+ (void) id;
+
+ req_handle->cur_num_peers++;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got %" PRIX32 ". of %" PRIX32 " peers\n",
+ req_handle->cur_num_peers, req_handle->num_peers);
+
+ if (req_handle->num_peers == req_handle->cur_num_peers)
+ { /* All peers are ready -- return those to the client */
+ GNUNET_assert (NULL != req_handle->callback);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "returning %" PRIX32 " peers to the client\n",
+ req_handle->num_peers);
+ req_handle->callback (req_handle->ids, req_handle->num_peers, req_handle->cls);
+
+ RPS_sampler_request_cancel (req_handle);
+ }
+}
+
+
+/**
+ * Get n random peers out of the sampled peers.
+ *
+ * We might want to reinitialise this sampler after giving the
+ * corrsponding peer to the client.
+ * Random with or without consumption?
+ *
+ * @param sampler the sampler to get peers from.
+ * @param cb callback that will be called once the ids are ready.
+ * @param cls closure given to @a cb
+ * @param for_client #GNUNET_YES if result is used for client,
+ * #GNUNET_NO if used internally
+ * @param num_peers the number of peers requested
+ */
+struct RPS_SamplerRequestHandle *
+RPS_sampler_get_n_rand_peers (struct RPS_Sampler *sampler,
+ uint32_t num_peers,
+ RPS_sampler_n_rand_peers_ready_cb cb,
+ void *cls)
+{
+ uint32_t i;
+ struct RPS_SamplerRequestHandle *req_handle;
+ struct GetPeerCls *gpc;
+
+ GNUNET_assert (0 != sampler->sampler_size);
+ if (0 == num_peers)
+ return NULL;
+
+ // TODO check if we have too much (distinct) sampled peers
+ req_handle = GNUNET_new (struct RPS_SamplerRequestHandle);
+ req_handle->num_peers = num_peers;
+ req_handle->cur_num_peers = 0;
+ req_handle->ids = GNUNET_new_array (num_peers, struct GNUNET_PeerIdentity);
+ req_handle->sampler = sampler;
+ req_handle->callback = cb;
+ req_handle->cls = cls;
+ GNUNET_CONTAINER_DLL_insert (sampler->req_handle_head,
+ sampler->req_handle_tail,
+ req_handle);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling requests for %" PRIu32 " peers\n", num_peers);
+
+ for (i = 0; i < num_peers; i++)
+ {
+ gpc = GNUNET_new (struct GetPeerCls);
+ gpc->req_handle = req_handle;
+ gpc->cont = check_n_peers_ready;
+ gpc->cont_cls = req_handle;
+ gpc->id = &req_handle->ids[i];
+
+ GNUNET_CONTAINER_DLL_insert (req_handle->gpc_head,
+ req_handle->gpc_tail,
+ gpc);
+ // maybe add a little delay
+ gpc->get_peer_task = GNUNET_SCHEDULER_add_now (sampler->get_peers,
+ gpc);
+ }
+ return req_handle;
+}
+
+/**
+ * Cancle a request issued through #RPS_sampler_n_rand_peers_ready_cb.
+ *
+ * @param req_handle the handle to the request
+ */
+void
+RPS_sampler_request_cancel (struct RPS_SamplerRequestHandle *req_handle)
+{
+ struct GetPeerCls *i;
+
+ while (NULL != (i = req_handle->gpc_head) )
+ {
+ GNUNET_CONTAINER_DLL_remove (req_handle->gpc_head,
+ req_handle->gpc_tail,
+ i);
+ if (NULL != i->get_peer_task)
+ {
+ GNUNET_SCHEDULER_cancel (i->get_peer_task);
+ }
+ if (NULL != i->notify_ctx)
+ {
+ GNUNET_CONTAINER_DLL_remove (req_handle->sampler->notify_ctx_head,
+ req_handle->sampler->notify_ctx_tail,
+ i->notify_ctx);
+ GNUNET_free (i->notify_ctx);
+ }
+ GNUNET_free (i);
+ }
+ GNUNET_free (req_handle->ids);
+ GNUNET_CONTAINER_DLL_remove (req_handle->sampler->req_handle_head,
+ req_handle->sampler->req_handle_tail,
+ req_handle);
+ GNUNET_free (req_handle);
+}
+
+
+/**
+ * Cleans the sampler.
+ */
+ void
+RPS_sampler_destroy (struct RPS_Sampler *sampler)
+{
+ if (NULL != sampler->req_handle_head)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "There are still pending requests. Going to remove them.\n");
+ while (NULL != sampler->req_handle_head)
+ {
+ RPS_sampler_request_cancel (sampler->req_handle_head);
+ }
+ }
+ sampler_empty (sampler);
+ GNUNET_free (sampler);
+}
+
+
+/* end of rps-sampler_common.c */
--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C)
+
+ 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/>.
+*/
+
+/**
+ * @file rps/rps-sampler_common.h
+ * @brief Code common to client and service sampler
+ * @author Julius Bünger
+ */
+
+#ifndef RPS_SAMPLER_COMMON_H
+#define RPS_SAMPLER_COMMON_H
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+
+#include "gnunet-service-rps_sampler_elem.h"
+
+#include <math.h>
+#include <inttypes.h>
+
+#include "rps-test_util.h"
+
+
+/**
+ * Callback that is called from _get_rand_peer() when the PeerID is ready.
+ *
+ * @param cls the closure given alongside this function.
+ * @param id the PeerID that was returned
+ */
+typedef void
+(*RPS_sampler_rand_peer_ready_cont) (void *cls,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Type of function used to differentiate between modified and not modified
+ * Sampler.
+ */
+typedef void
+(*RPS_get_peers_type) (void *cls);
+
+
+/**
+ * Callback that is called from _get_n_rand_peers() when the PeerIDs are ready.
+ *
+ * @param cls the closure given alongside this function.
+ * @param ids the PeerIDs that were returned
+ * to be freed
+ */
+ typedef void
+(*RPS_sampler_n_rand_peers_ready_cb) (const struct GNUNET_PeerIdentity *ids,
+ uint32_t num_peers,
+ void *cls);
+
+
+/**
+ * @brief Callback called each time a new peer was put into the sampler
+ *
+ * @param cls A possibly given closure
+ */
+typedef void
+(*SamplerNotifyUpdateCB) (void *cls);
+
+
+/**
+ * Closure for #sampler_mod_get_rand_peer() and #sampler_get_rand_peer
+ */
+struct GetPeerCls
+{
+ /**
+ * DLL
+ */
+ struct GetPeerCls *next;
+ struct GetPeerCls *prev;
+
+ /**
+ * The #RPS_SamplerRequestHandle this single request belongs to.
+ */
+ struct RPS_SamplerRequestHandle *req_handle;
+
+ /**
+ * The task for this function.
+ */
+ struct GNUNET_SCHEDULER_Task *get_peer_task;
+
+ /**
+ * @brief Context to the given callback.
+ */
+ struct SamplerNotifyUpdateCTX *notify_ctx;
+
+ /**
+ * The callback
+ */
+ RPS_sampler_rand_peer_ready_cont cont;
+
+ /**
+ * The closure to the callback @e cont
+ */
+ void *cont_cls;
+
+ /**
+ * The address of the id to be stored at
+ */
+ struct GNUNET_PeerIdentity *id;
+};
+
+
+/**
+ * Sampler with its own array of SamplerElements
+ */
+struct RPS_Sampler
+{
+ /**
+ * Number of sampler elements we hold.
+ */
+ unsigned int sampler_size;
+ //size_t size;
+
+ /**
+ * All sampler elements in one array.
+ */
+ struct RPS_SamplerElement **sampler_elements;
+
+ /**
+ * Maximum time a round takes
+ *
+ * Used in the context of RPS
+ */
+ struct GNUNET_TIME_Relative max_round_interval;
+
+ /**
+ * Stores the function to return peers. Which one it is depends on whether
+ * the Sampler is the modified one or not.
+ */
+ RPS_get_peers_type get_peers;
+
+ /**
+ * Head and tail for the DLL to store the #RPS_SamplerRequestHandle
+ */
+ struct RPS_SamplerRequestHandle *req_handle_head;
+ struct RPS_SamplerRequestHandle *req_handle_tail;
+
+ struct SamplerNotifyUpdateCTX *notify_ctx_head;
+ struct SamplerNotifyUpdateCTX *notify_ctx_tail;
+ #ifdef TO_FILE
+ /**
+ * File name to log to
+ */
+ char *file_name;
+ #endif /* TO_FILE */
+};
+
+
+/**
+ * @brief Add a callback that will be called when the next peer is inserted
+ * into the sampler
+ *
+ * @param sampler The sampler on which update it will be called
+ * @param notify_cb The callback
+ * @param cls Closure given to the callback
+ *
+ * @return The context containing callback and closure
+ */
+struct SamplerNotifyUpdateCTX *
+sampler_notify_on_update (struct RPS_Sampler *sampler,
+ SamplerNotifyUpdateCB notify_cb,
+ void *cls);
+
+
+/**
+ * Update every sampler element of this sampler with given peer
+ *
+ * @param sampler the sampler to update.
+ * @param id the PeerID that is put in the sampler
+ */
+ void
+RPS_sampler_update (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Reinitialise all previously initialised sampler elements with the given value.
+ *
+ * Used to get rid of a PeerID.
+ *
+ * @param sampler the sampler to reinitialise a sampler element in.
+ * @param id the id of the sampler elements to update.
+ */
+ void
+RPS_sampler_reinitialise_by_value (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Get the size of the sampler.
+ *
+ * @param sampler the sampler to return the size of.
+ * @return the size of the sampler
+ */
+unsigned int
+RPS_sampler_get_size (struct RPS_Sampler *sampler);
+
+
+/**
+ * Grow or shrink the size of the sampler.
+ *
+ * @param sampler the sampler to resize.
+ * @param new_size the new size of the sampler
+ */
+void
+RPS_sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size);
+
+
+/**
+ * Get n random peers out of the sampled peers.
+ *
+ * We might want to reinitialise this sampler after giving the
+ * corrsponding peer to the client.
+ * Random with or without consumption?
+ *
+ * @param sampler the sampler to get peers from.
+ * @param cb callback that will be called once the ids are ready.
+ * @param cls closure given to @a cb
+ * @param for_client #GNUNET_YES if result is used for client,
+ * #GNUNET_NO if used internally
+ * @param num_peers the number of peers requested
+ */
+struct RPS_SamplerRequestHandle *
+RPS_sampler_get_n_rand_peers (struct RPS_Sampler *sampler,
+ uint32_t num_peers,
+ RPS_sampler_n_rand_peers_ready_cb cb,
+ void *cls);
+
+
+/**
+ * Counts how many Samplers currently hold a given PeerID.
+ *
+ * @param sampler the sampler to count ids in.
+ * @param id the PeerID to count.
+ *
+ * @return the number of occurrences of id.
+ */
+ uint32_t
+RPS_sampler_count_id (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id);
+
+
+/**
+ * Cancle a request issued through #RPS_sampler_n_rand_peers_ready_cb.
+ *
+ * @param req_handle the handle to the request
+ */
+void
+RPS_sampler_request_cancel (struct RPS_SamplerRequestHandle *req_handle);
+
+
+/**
+ * Cleans the sampler.
+ */
+ void
+RPS_sampler_destroy (struct RPS_Sampler *sampler);
+
+#endif /* RPS_SAMPLER_COMMON_H */
+/* end of rps-sampler_common.h */
#include "gnunet_util_lib.h"
#include "rps.h"
#include "gnunet_rps_service.h"
-#include "gnunet-service-rps_sampler.h"
+#include "rps-sampler_client.h"
#include <inttypes.h>
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