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/* Copyright (c) 2012-2025. 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 "routing_table.h"
#include "node.h"
XBT_LOG_NEW_DEFAULT_CATEGORY(dht_kademlia_routing_table, "Messages specific for this example");
/** @brief Initialization of a node routing table. */
routing_table_t routing_table_init(unsigned int node_id)
{
routing_table_t table = xbt_new(s_routing_table_t, 1);
table->buckets = xbt_new(s_bucket_t, IDENTIFIER_SIZE + 1);
for (unsigned int i = 0; i < IDENTIFIER_SIZE + 1; i++) {
table->buckets[i].nodes = xbt_dynar_new(sizeof(unsigned int), NULL);
table->buckets[i].id = i;
}
table->id = node_id;
return table;
}
/** @brief Frees the routing table */
void routing_table_free(routing_table_t table)
{
// Free the buckets.
for (unsigned int i = 0; i <= IDENTIFIER_SIZE; i++) {
xbt_dynar_free(&table->buckets[i].nodes);
}
xbt_free(table->buckets);
xbt_free(table);
}
/**@brief prints the routing table, to debug stuff. */
void routing_table_print(const_routing_table_t table)
{
XBT_INFO("Routing table of %08x:", table->id);
for (unsigned int i = 0; i <= IDENTIFIER_SIZE; i++) {
if (!xbt_dynar_is_empty(table->buckets[i].nodes)) {
XBT_INFO("Bucket number %u: ", i);
unsigned int j;
unsigned int value;
xbt_dynar_foreach (table->buckets[i].nodes, j, value) {
XBT_INFO("Element %u: %08x", j, value);
}
}
}
}
/** @brief Finds an identifier in a bucket and returns its position or returns -1 if it doesn't exists
* @param bucket the bucket in which we try to find our identifier
* @param id the id
*/
unsigned int bucket_find_id(const_bucket_t bucket, unsigned int id)
{
unsigned int i;
unsigned int current_id;
xbt_dynar_foreach (bucket->nodes, i, current_id) {
if (id == current_id) {
return i;
}
}
return -1;
}
/** @brief Finds the corresponding bucket in a routing table for a given identifier
* @param table the routing table
* @param id the identifier
* @return the bucket in which the the identifier would be.
*/
bucket_t routing_table_find_bucket(const_routing_table_t table, unsigned int id)
{
unsigned int xor_number = table->id ^ id;
unsigned int prefix = get_node_prefix(xor_number, IDENTIFIER_SIZE);
xbt_assert(prefix <= IDENTIFIER_SIZE, "Tried to return a bucket that doesn't exist.");
bucket_t bucket = &table->buckets[prefix];
return bucket;
}
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