/*
This file is part of GNUnet.
- (C)
+ Copyright (C)
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.
*/
/**
#include "rps.h"
#include "gnunet-service-rps_sampler.h"
+#include "gnunet-service-rps_sampler_elem.h"
#include <math.h>
#include <inttypes.h>
-#define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
+#include "rps-test_util.h"
+
+#define LOG(kind, ...) GNUNET_log_from(kind,"rps-sampler",__VA_ARGS__)
+
// multiple 'clients'?
// TODO care about invalid input of the caller (size 0 or less...)
-enum RPS_SamplerEmpty
-{
- NOT_EMPTY = 0x0,
- EMPTY = 0x1
-};
+/**
+ * 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);
+
/**
- * A sampler element sampling one PeerID at a time.
+ * Closure for #sampler_mod_get_rand_peer() and #sampler_get_rand_peer
*/
-struct RPS_SamplerElement
+struct GetPeerCls
{
/**
- * Min-wise linear permutation used by this sampler.
- *
- * This is an key later used by a hmac.
+ * DLL
*/
- struct GNUNET_CRYPTO_AuthKey auth_key;
+ struct GetPeerCls *next;
+ struct GetPeerCls *prev;
/**
- * The PeerID this sampler currently samples.
+ * The #RPS_SamplerRequestHandle this single request belongs to.
*/
- struct GNUNET_PeerIdentity peer_id;
+ struct RPS_SamplerRequestHandle *req_handle;
/**
- * The according hash value of this PeerID.
+ * The task for this function.
*/
- struct GNUNET_HashCode peer_id_hash;
+ struct GNUNET_SCHEDULER_Task *get_peer_task;
/**
- * Time of last request.
+ * The callback
*/
- struct GNUNET_TIME_Absolute last_request;
-
+ RPS_sampler_rand_peer_ready_cont cont;
+
/**
- * Flag that indicates that we are not holding a valid PeerID right now.
+ * The closure to the callback @e cont
*/
- enum RPS_SamplerEmpty is_empty;
+ 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.
+ */
+typedef void
+(*RPS_get_peers_type) (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+/**
+ * Get one random peer out of the sampled peers.
+ *
+ * We might want to reinitialise this sampler after giving the
+ * corrsponding peer to the client.
+ * Only used internally
+ */
+static void
+sampler_get_rand_peer (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+/**
+ * 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,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
/**
* Sampler with its own array of SamplerElements
*/
//size_t size;
/**
- * All Samplers in one array.
+ * All sampler elements in one array.
*/
struct RPS_SamplerElement **sampler_elements;
/**
- * Index to a sampler element.
+ * Maximum time a round takes
*
- * Gets cycled on every hist_request.
+ * 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;
+
+ #ifdef TO_FILE
+ /**
+ * File name to log to
+ */
+ char *file_name;
+ #endif /* TO_FILE */
+};
+
+/**
+ * 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.
*/
- uint64_t sampler_elem_index;
+ uint32_t cur_num_peers;
/**
- * Callback to be called when a peer gets inserted into a sampler.
+ * Pointer to the array holding the ids.
*/
- RPS_sampler_insert_cb insert_cb;
+ struct GNUNET_PeerIdentity *ids;
/**
- * Closure to the insert_cb.
+ * Head and tail for the DLL to store the tasks for single requests
*/
- void *insert_cls;
+ struct GetPeerCls *gpc_head;
+ struct GetPeerCls *gpc_tail;
/**
- * Callback to be called when a peer gets inserted into a sampler.
+ * Sampler.
*/
- RPS_sampler_remove_cb remove_cb;
+ struct RPS_Sampler *sampler;
/**
- * Closure to the remove_cb.
+ * Callback to be called when all ids are available.
*/
- void *remove_cls;
+ RPS_sampler_n_rand_peers_ready_cb callback;
+
+ /**
+ * Closure given to the callback
+ */
+ void *cls;
};
-/**
- * Global sampler variable.
- */
-struct RPS_Sampler *sampler;
+///**
+// * Global sampler variable.
+// */
+//struct RPS_Sampler *sampler;
/**
/**
* Inedex to the sampler element that is the next to be returned
*/
-static uint64_t client_get_index;
+static uint32_t client_get_index;
/**
- * Reinitialise a previously initialised sampler element.
+ * Callback to _get_rand_peer() used by _get_n_rand_peers().
*
- * @param sampler pointer to the memory that keeps the value.
+ * Checks whether all n peers are available. If they are,
+ * give those back.
*/
- static void
-RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_el)
+static void
+check_n_peers_ready (void *cls,
+ const struct GNUNET_PeerIdentity *id)
{
- sampler_el->is_empty = EMPTY;
+ struct RPS_SamplerRequestHandle *req_handle = cls;
- // I guess I don't need to call GNUNET_CRYPTO_hmac_derive_key()...
- GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_STRONG,
- &(sampler_el->auth_key.key),
- GNUNET_CRYPTO_HASH_LENGTH);
+ 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);
- sampler_el->last_request = GNUNET_TIME_UNIT_FOREVER_ABS;
+ 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);
- /* We might want to keep the previous peer */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "returning %" PRIX32 " peers to the client\n",
+ req_handle->num_peers);
+ req_handle->callback (req_handle->cls, req_handle->ids, req_handle->num_peers);
- //GNUNET_CRYPTO_hmac(&sampler_el->auth_key, sampler_el->peer_id,
- // sizeof(struct GNUNET_PeerIdentity),
- // &sampler_el->peer_id_hash);
+ RPS_sampler_request_cancel (req_handle);
+ }
}
/**
- * (Re)Initialise given Sampler with random min-wise independent function.
- *
- * In this implementation this means choosing an auth_key for later use in
- * a hmac at random.
+ * Get the size of the sampler.
*
- * @return a newly created RPS_SamplerElement which currently holds no id.
+ * @param sampler the sampler to return the size of.
+ * @return the size of the sampler
*/
- struct RPS_SamplerElement *
-RPS_sampler_elem_create (void)
+unsigned int
+RPS_sampler_get_size (struct RPS_Sampler *sampler)
{
- struct RPS_SamplerElement *s;
-
- s = GNUNET_new (struct RPS_SamplerElement);
-
- RPS_sampler_elem_reinit (s);
- LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: initialised with empty PeerID\n");
-
- return s;
-}
-
-
-/**
- * Input an PeerID into the given sampler.
- */
- static void
-RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem, const struct GNUNET_PeerIdentity *other,
- RPS_sampler_insert_cb insert_cb, void *insert_cls,
- RPS_sampler_remove_cb remove_cb, void *remove_cls)
-{
- struct GNUNET_HashCode other_hash;
-
- if ( 0 == GNUNET_CRYPTO_cmp_peer_identity(other, &(s_elem->peer_id)) )
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
- GNUNET_i2s(other));
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Have already PeerID %s\n",
- GNUNET_i2s(&(s_elem->peer_id)));
- }
- else
- {
- GNUNET_CRYPTO_hmac(&s_elem->auth_key,
- other,
- sizeof(struct GNUNET_PeerIdentity),
- &other_hash);
-
- if ( EMPTY == s_elem->is_empty )
- { // Or whatever is a valid way to say
- // "we have no PeerID at the moment"
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s; Simply accepting (was empty previously).\n",
- GNUNET_i2s(other));
- s_elem->peer_id = *other;
- //s_elem->peer_id = other;
- s_elem->peer_id_hash = other_hash;
- if (NULL != sampler->insert_cb)
- {
- sampler->insert_cb(sampler->insert_cls, &(s_elem->peer_id));
- }
- }
- else if ( 0 > GNUNET_CRYPTO_hash_cmp(&other_hash, &s_elem->peer_id_hash) )
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
- GNUNET_i2s(other));
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Discarding old PeerID %s\n",
- GNUNET_i2s(&s_elem->peer_id));
-
- if ( NULL != sampler->remove_cb )
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing old PeerID %s with the remove callback.\n",
- GNUNET_i2s(&s_elem->peer_id));
- sampler->remove_cb(sampler->remove_cls, &s_elem->peer_id);
- }
-
- memcpy(&s_elem->peer_id, other, sizeof(struct GNUNET_PeerIdentity));
- //s_elem->peer_id = other;
- s_elem->peer_id_hash = other_hash;
-
- if ( NULL != sampler->insert_cb )
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Inserting new PeerID %s with the insert callback.\n",
- GNUNET_i2s(&s_elem->peer_id));
- sampler->insert_cb(sampler->insert_cls, &s_elem->peer_id);
- }
- }
- else
- {
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Got PeerID %s\n",
- GNUNET_i2s(other));
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Keeping old PeerID %s\n",
- GNUNET_i2s(&s_elem->peer_id));
- }
- }
- s_elem->is_empty = NOT_EMPTY;
+ 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
*/
- void
-RPS_sampler_resize (unsigned int new_size)
+static void
+sampler_resize (struct RPS_Sampler *sampler, unsigned int new_size)
{
unsigned int old_size;
- uint64_t i;
- struct RPS_SamplerElement **rem_list;
+ uint32_t i;
// TODO check min and max size
if (old_size > new_size)
{ /* Shrinking */
- /* Temporary store those to properly call the removeCB on those later */
- rem_list = GNUNET_malloc ((old_size - new_size) * sizeof (struct RPS_SamplerElement *));
- memcpy (rem_list,
- &sampler->sampler_elements[new_size],
- (old_size - new_size) * sizeof (struct RPS_SamplerElement *));
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Shrinking sampler %d -> %d\n", old_size, new_size);
- GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
+
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "SAMPLER: sampler->sampler_elements now points to %p\n",
- sampler->sampler_elements);
-
- for (i = 0 ; i < old_size - new_size ; i++)
- {/* Remove unneeded rest */
- LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Removing %" PRIX64 ". sampler\n", i);
- if (NULL != sampler->remove_cb)
- sampler->remove_cb (sampler->remove_cls, &rem_list[i]->peer_id);
- GNUNET_free (rem_list[i]);
+ "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);
}
+
+ 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, "SAMPLER: Growing sampler %d -> %d\n", old_size, new_size);
- GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, new_size);
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "SAMPLER: sampler->sampler_elements now points to %p\n",
- sampler->sampler_elements);
+ "Growing sampler %d -> %d\n",
+ old_size,
+ new_size);
- for ( i = old_size ; i < new_size ; i++ )
+ 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 ();
- if (NULL != sampler->insert_cb)
- sampler->insert_cb (sampler->insert_cls, &sampler->sampler_elements[i]->peer_id);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "SAMPLER: Added %" PRIX64 ". sampler, now pointing to %p, contains %s\n",
- i, &sampler->sampler_elements[i], GNUNET_i2s (&sampler->sampler_elements[i]->peer_id));
+
+ to_file (sampler->file_name,
+ "+%" PRIu32 ": %s",
+ i,
+ sampler->sampler_elements[i]->file_name);
}
}
else
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Size remains the same -- nothing to do\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Size remains the same -- nothing to do\n");
return;
}
- GNUNET_assert(sampler->sampler_size == new_size);
- LOG(GNUNET_ERROR_TYPE_DEBUG, "SAMPLER: Finished growing/shrinking.\n"); // remove
+ 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.
*
* @param init_size the size the sampler is initialised with
- * @param id with which all newly created sampler elements are initialised
- * @param ins_cb the callback that will be called on every PeerID that is
- * newly inserted into a sampler element
- * @param ins_cls the closure given to #ins_cb
- * @param rem_cb the callback that will be called on every PeerID that is
- * removed from a sampler element
- * @param rem_cls the closure given to #rem_cb
+ * @param max_round_interval maximum time a round takes
+ * @return a handle to a sampler that consists of sampler elements.
*/
- void
-RPS_sampler_init (size_t init_size, const struct GNUNET_PeerIdentity *id,
- RPS_sampler_insert_cb ins_cb, void *ins_cls,
- RPS_sampler_remove_cb rem_cb, void *rem_cls)
+struct RPS_Sampler *
+RPS_sampler_init (size_t init_size,
+ struct GNUNET_TIME_Relative max_round_interval)
{
- //struct RPS_Sampler *sampler;
- //uint64_t i;
+ 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()
- GNUNET_new_array (64, struct GNUNET_TIME_Relative);
sampler = GNUNET_new (struct RPS_Sampler);
- sampler->sampler_size = 0;
- sampler->sampler_elements = NULL;
- sampler->insert_cb = ins_cb;
- sampler->insert_cls = ins_cls;
- sampler->remove_cb = rem_cb;
- sampler->remove_cls = rem_cls;
+
+ #ifdef TO_FILE
+ sampler->file_name = create_file ("sampler-");
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Initialised sampler %s\n",
+ sampler->file_name);
+ #endif /* TO_FILE */
+
+ sampler->max_round_interval = max_round_interval;
+ sampler->get_peers = sampler_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 (init_size);
- RPS_sampler_update_list (id); // no super nice desing but ok for the moment
+ RPS_sampler_resize (sampler, init_size);
client_get_index = 0;
//GNUNET_assert (init_size == sampler->sampler_size);
+ 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;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Initialised modified sampler %s\n",
+ sampler->file_name);
+ to_file (sampler->file_name,
+ "This is a modified sampler");
+
+ return sampler;
}
/**
* A fuction to update every sampler in the given list
*
+ * @param sampler the sampler to update.
* @param id the PeerID that is put in the sampler
*/
void
-RPS_sampler_update_list (const struct GNUNET_PeerIdentity *id)
+RPS_sampler_update (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
{
- uint64_t i;
+ uint32_t i;
+
+ to_file (sampler->file_name,
+ "Got %s",
+ GNUNET_i2s_full (id));
+
+ for (i = 0 ; i < sampler->sampler_size ; i++)
+ {
+ RPS_sampler_elem_next (sampler->sampler_elements[i],
+ id);
+ }
- for ( i = 0 ; i < sampler->sampler_size ; i++ )
- RPS_sampler_elem_next (sampler->sampler_elements[i], id,
- sampler->insert_cb, sampler->insert_cls,
- sampler->remove_cb, sampler->remove_cls);
}
*
* 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 (const struct GNUNET_PeerIdentity *id)
+RPS_sampler_reinitialise_by_value (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
{
- uint64_t i;
+ uint32_t i;
+ struct RPS_SamplerElement *trash_entry;
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, "SAMPLER: Reinitialising sampler\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Reinitialising sampler\n");
+ trash_entry = GNUNET_new (struct RPS_SamplerElement);
+ *trash_entry = *(sampler->sampler_elements[i]);
+ to_file (trash_entry->file_name,
+ "--- non-active");
RPS_sampler_elem_reinit (sampler->sampler_elements[i]);
}
}
* corrsponding peer to the client.
* Only used internally
*/
- const struct GNUNET_PeerIdentity *
-RPS_sampler_get_rand_peer_ ()
+static void
+sampler_get_rand_peer (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- uint64_t r_index;
- const struct GNUNET_PeerIdentity *peer; // do we have to malloc that?
+ struct GetPeerCls *gpc = cls;
+ uint32_t r_index;
+ struct RPS_Sampler *sampler;
- // TODO implement extra logic
+ gpc->get_peer_task = NULL;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ sampler = gpc->req_handle->sampler;
/**;
* Choose the r_index of the peer we want to return
* at random from the interval of the gossip list
*/
- r_index = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_STRONG,
+ r_index = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_STRONG,
sampler->sampler_size);
- //if ( EMPTY == sampler->sampler_elements[r_index]->is_empty )
- // // TODO schedule for later
- // peer = NULL;
- //else
- peer = &(sampler->sampler_elements[r_index]->peer_id);
- sampler->sampler_elements[r_index]->last_request = GNUNET_TIME_absolute_get();
- LOG(GNUNET_ERROR_TYPE_DEBUG, "Sgrp: Returning PeerID %s\n", GNUNET_i2s(peer));
+ if (EMPTY == sampler->sampler_elements[r_index]->is_empty)
+ {
+ //LOG (GNUNET_ERROR_TYPE_DEBUG,
+ // "Not returning randomly selected, empty PeerID. - Rescheduling.\n");
+
+ /* FIXME no active wait - get notified, when new id arrives?
+ * Might also be a freshly emptied one. Others might still contain ids.
+ * Counter?
+ */
+ gpc->get_peer_task =
+ GNUNET_SCHEDULER_add_delayed (
+ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1),
+ &sampler_get_rand_peer,
+ cls);
+ return;
+ }
+
+ GNUNET_CONTAINER_DLL_remove (gpc->req_handle->gpc_head,
+ gpc->req_handle->gpc_tail,
+ gpc);
+ *gpc->id = sampler->sampler_elements[r_index]->peer_id;
+ gpc->cont (gpc->cont_cls, gpc->id);
- return peer;
+ GNUNET_free (gpc);
}
/**
- * Get n random peers out of the sampled peers.
+ * Get one random peer 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?
- * Only used internally
*/
- const struct GNUNET_PeerIdentity *
-RPS_sampler_get_n_rand_peers_ (uint64_t n)
+static void
+sampler_mod_get_rand_peer (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- if ( 0 == sampler->sampler_size )
+ 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;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ 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,
- "Sgrp: List empty - Returning NULL\n");
- return NULL;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Sampler_mod element empty, rescheduling.\n");
+ GNUNET_assert (NULL == gpc->get_peer_task);
+ gpc->get_peer_task =
+ GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
+ &sampler_mod_get_rand_peer,
+ cls);
+ return;
}
- else
- {
- // TODO check if we have too much (distinct) sampled peers
- // If we are not ready yet maybe schedule for later
- struct GNUNET_PeerIdentity *peers;
- uint64_t i;
-
- peers = GNUNET_malloc (n * sizeof(struct GNUNET_PeerIdentity));
- for ( i = 0 ; i < n ; i++ ) {
- //peers[i] = RPS_sampler_get_rand_peer_(sampler->sampler_elements);
- memcpy (&peers[i], RPS_sampler_get_rand_peer_ (), sizeof (struct GNUNET_PeerIdentity));
+ /* 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)
+ {
+ 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->get_peer_task);
+ gpc->get_peer_task =
+ GNUNET_SCHEDULER_add_delayed (sampler->max_round_interval,
+ &sampler_mod_get_rand_peer,
+ cls);
+ return;
}
- return peers;
+ // TODO add other reasons to wait here
}
-}
+ s_elem->last_client_request = GNUNET_TIME_absolute_get ();
-/**
- * Get one random peer out of the sampled peers.
- *
- * We might want to reinitialise this sampler after giving the
- * corrsponding peer to the client.
- *
- * @return a random PeerID of the PeerIDs previously put into the sampler.
- */
- const struct GNUNET_PeerIdentity *
-RPS_sampler_get_rand_peer ()
-{
- struct GNUNET_PeerIdentity *peer;
-
- // use _get_rand_peer_ ?
- peer = GNUNET_new (struct GNUNET_PeerIdentity);
- *peer = sampler->sampler_elements[client_get_index]->peer_id;
- RPS_sampler_elem_reinit (sampler->sampler_elements[client_get_index]);
- if ( client_get_index == sampler->sampler_size )
- client_get_index = 0;
- else
- client_get_index++;
- return peer;
+ 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);
}
* corrsponding peer to the client.
* Random with or without consumption?
*
- * @return n random PeerIDs of the PeerIDs previously put into the sampler.
+ * @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
*/
- const struct GNUNET_PeerIdentity *
-RPS_sampler_get_n_rand_peers (uint64_t n)
+struct RPS_SamplerRequestHandle *
+RPS_sampler_get_n_rand_peers (struct RPS_Sampler *sampler,
+ RPS_sampler_n_rand_peers_ready_cb cb,
+ void *cls, uint32_t num_peers)
{
- // use _get_rand_peers_ ?
- if ( 0 == sampler->sampler_size )
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Sgrp: List empty - Returning NULL\n");
+ GNUNET_assert (0 != sampler->sampler_size);
+ if (0 == num_peers)
return NULL;
+
+ // TODO check if we have too much (distinct) sampled peers
+ uint32_t i;
+ struct RPS_SamplerRequestHandle *req_handle;
+ struct GetPeerCls *gpc;
+
+ 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);
}
- else
+ 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) )
{
- // TODO check if we have too much (distinct) sampled peers
- // If we are not ready yet maybe schedule for later
- struct GNUNET_PeerIdentity *peers;
- const struct GNUNET_PeerIdentity *peer;
- uint64_t i;
-
- peers = GNUNET_malloc (n * sizeof (struct GNUNET_PeerIdentity));
-
- for ( i = 0 ; i < n ; i++ ) {
- //peers[i] = RPS_sampler_get_rand_peer_(sampler->sampler_elements);
- peer = RPS_sampler_get_rand_peer ();
- memcpy (&peers[i], peer, sizeof (struct GNUNET_PeerIdentity));
- //GNUNET_free (peer);
- }
- return peers;
+ 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);
+ GNUNET_free (i);
}
+ 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.
*/
- uint64_t
-RPS_sampler_count_id (const struct GNUNET_PeerIdentity *id)
+ uint32_t
+RPS_sampler_count_id (struct RPS_Sampler *sampler,
+ const struct GNUNET_PeerIdentity *id)
{
- uint64_t count;
- uint64_t i;
+ 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)
+ if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&sampler->sampler_elements[i]->peer_id, id)
&& EMPTY != sampler->sampler_elements[i]->is_empty)
count++;
}
* Cleans the sampler.
*/
void
-RPS_sampler_destroy ()
+RPS_sampler_destroy (struct RPS_Sampler *sampler)
{
- RPS_sampler_resize (0);
- GNUNET_array_grow (sampler->sampler_elements, sampler->sampler_size, 0);
+ 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 */
projects / oweals / gnunet.git / blobdiff