+++ /dev/null
-/* Copyright (c) 2010-2019. The SimGrid Team. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "node.h"
-#include "routing_table.h"
-#include "simgrid/msg.h"
-
-#include <stdio.h> /* snprintf */
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(msg_kademlia_node, "Messages specific for this msg example");
-
-/** @brief Initialization of a node
- * @param node_id the id of the node
- * @return the node created
- */
-node_t node_init(unsigned int node_id)
-{
- node_t node = xbt_new(s_node_t, 1);
-
- node->id = node_id;
- node->table = routing_table_init(node_id);
- snprintf(node->mailbox, MAILBOX_NAME_SIZE - 1, "%u", node_id);
- node->find_node_failed = 0;
- node->find_node_success = 0;
-
- node->task_received = NULL;
- node->receive_comm = NULL;
-
- return node;
-}
-
-/* @brief Node destructor */
-void node_free(node_t node)
-{
- routing_table_free(node->table);
- xbt_free(node);
-}
-
-/** @brief Updates/Puts the node id unsigned into our routing table
- * @param node Our node data
- * @param id The id of the node we need to add unsigned into our routing table
- */
-void node_routing_table_update(node_t node, unsigned int id)
-{
- routing_table_t table = node->table;
- //retrieval of the bucket in which the should be
- bucket_t bucket = routing_table_find_bucket(table, id);
-
- //check if the id is already in the bucket.
- unsigned int id_pos = bucket_find_id(bucket, id);
-
- if (id_pos == -1) {
- /* We check if the bucket is full or not. If it is, we evict old offline elements */
- if (xbt_dynar_length(bucket->nodes) < bucket_size) {
- //TODO: this is not really very efficient. Maybe we should use something else than dynars ?
- xbt_dynar_unshift(bucket->nodes, &id);
- XBT_VERB("I'm adding to my routing table %08x", id);
- } else {
- /* TODO: we need to evict the old elements: that's why this function is in "node" instead of "routing table".
- * This is not implemented yet. */
- }
- } else {
- //We push to the front of the dynar the element.
- unsigned int element = xbt_dynar_get_as(bucket->nodes, id_pos, unsigned int);
- xbt_dynar_remove_at(bucket->nodes, id_pos, NULL);
- xbt_dynar_unshift(bucket->nodes, &element);
- XBT_VERB("I'm updating %08x", element);
- }
-}
-
-/** @brief Finds the closest nodes to the node given.
- * @param node : our node
- * @param destination_id : the id of the guy we are trying to find
- */
-answer_t node_find_closest(node_t node, unsigned int destination_id)
-{
- int i;
- answer_t answer = answer_init(destination_id);
- /* We find the corresponding bucket for the id */
- bucket_t bucket = routing_table_find_bucket(node->table, destination_id);
- int bucket_id = bucket->id;
- xbt_assert((bucket_id <= identifier_size), "Bucket found has a wrong identifier");
- /* So, we copy the contents of the bucket unsigned into our result dynar */
- answer_add_bucket(bucket, answer);
-
- /* However, if we don't have enough elements in our bucket, we NEED to include at least "bucket_size" elements
- * (if, of course, we know at least "bucket_size" elements. So we're going to look unsigned into the other buckets.
- */
- for (i = 1; answer->size < bucket_size && ((bucket_id - i > 0) || (bucket_id + i < identifier_size)); i++) {
- /* We check the previous buckets */
- if (bucket_id - i >= 0) {
- bucket_t bucket_p = &node->table->buckets[bucket_id - i];
- answer_add_bucket(bucket_p, answer);
- }
- /* We check the next buckets */
- if (bucket_id + i <= identifier_size) {
- bucket_t bucket_n = &node->table->buckets[bucket_id + i];
- answer_add_bucket(bucket_n, answer);
- }
- }
- /* We sort the array by XOR distance */
- answer_sort(answer);
- /* We trim the array to have only bucket_size or less elements */
- answer_trim(answer);
-
- return answer;
-}
-
-/**@brief Returns an identifier which is in a specific bucket of a routing table
- * @param id id of the routing table owner
- * @param prefix id of the bucket where we want that identifier to be
- */
-unsigned int get_id_in_prefix(unsigned int id, unsigned int prefix)
-{
- if (prefix == 0) {
- return 0;
- } else {
- return (1U << ((unsigned int)(prefix - 1))) ^ id;
- }
-}
-
-/** @brief Returns the prefix of an identifier.
- * The prefix is the id of the bucket in which the remote identifier xor our identifier should be stored.
- * @param id : big unsigned int id to test
- * @param nb_bits : key size
- */
-unsigned int get_node_prefix(unsigned int id, unsigned int nb_bits)
-{
- unsigned int size = sizeof(unsigned int) * 8;
- for (unsigned int j = 0; j < size; j++) {
- if (((id >> (size - 1 - j)) & 0x1) != 0) {
- return nb_bits - (j);
- }
- }
- return 0;
-}
-
-/** @brief Gets the mailbox name of a host given its identifier */
-void get_node_mailbox(unsigned int id, char *mailbox)
-{
- snprintf(mailbox, MAILBOX_NAME_SIZE - 1, "%u", id);
-}
-
-/** Constructor, build a new contact information. */
-node_contact_t node_contact_new(unsigned int id, unsigned int distance)
-{
- node_contact_t contact = xbt_new(s_node_contact_t, 1);
-
- contact->id = id;
- contact->distance = distance;
-
- return contact;
-}
-
-/** Builds a contact information from a contact information */
-node_contact_t node_contact_copy(node_contact_t node_contact)
-{
- node_contact_t contact = xbt_new(s_node_contact_t, 1);
-
- contact->id = node_contact->id;
- contact->distance = node_contact->distance;
-
- return contact;
-}
-
-/** Destructor */
-void node_contact_free(node_contact_t contact)
-{
- xbt_free(contact);
-}
