c-libp2p/peer/providerstore.c

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#include <stdlib.h>
#include <string.h>
#include "libp2p/peer/providerstore.h"
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#include "libp2p/utils/vector.h"
#include "libp2p/utils/logger.h"
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/***
* Stores hashes, and peers where you can possibly get them
*/
/**
* Create a new ProviderStore
* @param datastore the datastore (required in order to look for the file locally)
* @param local_peer the local peer
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* @returns a ProviderStore struct
*/
struct ProviderStore* libp2p_providerstore_new(const struct Datastore* datastore, const struct Libp2pPeer* local_peer) {
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struct ProviderStore* out = (struct ProviderStore*)malloc(sizeof(struct ProviderStore));
if (out != NULL) {
out->datastore = datastore;
out->local_peer = local_peer;
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out->provider_entries = libp2p_utils_vector_new(4);
}
return out;
}
void libp2p_providerstore_entry_free(struct ProviderEntry* in) {
if (in != NULL) {
if (in->hash != NULL) {
free(in->hash);
in->hash_size = 0;
}
if (in->peer_id != NULL) {
free(in->peer_id);
in->peer_id_size = 0;
}
free(in);
}
}
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/***
* Clean resources used by a ProviderStore
* @param in the ProviderStore to clean up
*/
void libp2p_providerstore_free(struct ProviderStore* in) {
if (in != NULL) {
for(int i = 0; i < in->provider_entries->total; i++) {
struct ProviderEntry* entry = (struct ProviderEntry*) libp2p_utils_vector_get(in->provider_entries, i);
libp2p_providerstore_entry_free(entry);
}
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libp2p_utils_vector_free(in->provider_entries);
free(in);
in = NULL;
}
}
int libp2p_providerstore_add(struct ProviderStore* store, const unsigned char* hash, int hash_size, const unsigned char* peer_id, int peer_id_size) {
char hash_str[hash_size + 1];
memcpy(hash_str, hash, hash_size);
hash_str[hash_size] = 0;
char peer_str[peer_id_size + 1];
memcpy(peer_str, peer_id, peer_id_size);
peer_str[peer_id_size] = 0;
libp2p_logger_debug("providerstore", "Adding hash %s to providerstore. It can be retrieved from %s\n", hash_str, peer_str);
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struct ProviderEntry* entry = (struct ProviderEntry*)malloc(sizeof(struct ProviderEntry));
entry->hash = malloc(hash_size);
memcpy(entry->hash, hash, hash_size);
entry->hash_size = hash_size;
entry->peer_id = malloc(peer_id_size);
memcpy(entry->peer_id, peer_id, peer_id_size);
entry->peer_id_size = peer_id_size;
libp2p_utils_vector_add(store->provider_entries, entry);
return 1;
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}
/**
* See if someone has announced a key. If so, pass the peer_id
* NOTE: This will check to see if I can provide it from my datastore
*
* @param store the list of providers
* @param hash what we're looking for
* @param hash_size the length of the hash
* @param peer_id the peer_id of who can provide it
* @param peer_id_size the allocated size of peer_id
* @returns true(1) if we found something, false(0) if not.
*/
int libp2p_providerstore_get(struct ProviderStore* store, const unsigned char* hash, int hash_size, unsigned char** peer_id, int *peer_id_size) {
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struct ProviderEntry* current = NULL;
// can I provide it locally?
size_t results_size = 65535;
unsigned char results[results_size];
if (store->datastore->datastore_get((const char*)hash, hash_size, &results[0], results_size, &results_size, store->datastore)) {
// we found it locally. Let them know
*peer_id = malloc(store->local_peer->id_size);
if (*peer_id == NULL)
return 0;
*peer_id_size = store->local_peer->id_size;
memcpy(*peer_id, store->local_peer->id, *peer_id_size);
return 1;
}
// skip index 0, as we checked above...
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for (int i = 0; i < store->provider_entries->total; i++) {
current = (struct ProviderEntry*)libp2p_utils_vector_get(store->provider_entries, i);
if (current->hash_size == hash_size && memcmp(current->hash, hash, hash_size) == 0) {
*peer_id = malloc(current->peer_id_size);
memcpy(*peer_id, current->peer_id, current->peer_id_size);
*peer_id_size = current->peer_id_size;
return 1;
}
}
return 0;
}