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Added get_value to dht

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This commit is contained in:
John Jones 2017-04-06 09:55:01 -05:00
parent 1fa1e92016
commit e237b239a1
2 changed files with 52 additions and 23 deletions
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2
include/libp2p/conn/session.h
View file

@ -1,6 +1,7 @@
#pragma once
#include "libp2p/crypto/key.h"
#include "libp2p/db/datastore.h"
/***
* Holds the details of communication between two hosts
*/
@ -16,6 +17,7 @@ struct SessionContext {
struct Stream* insecure_stream;
struct Stream* secure_stream;
struct Stream* default_stream;
struct Datastore* datastore;
// filled in during negotiations
char* chosen_curve;
char* chosen_cipher;

71
routing/dht_protocol.c
View file

@ -11,6 +11,25 @@
* This is where kademlia and dht talk to the outside world
*/
/***
* Helper method to protobuf a message
* @param message the message
* @param buffer where to put the results
* @param buffer_size the size of the results
* @returns true(1) on success, false(0) otherwise
*/
int libp2p_routing_dht_protobuf_message(struct Libp2pMessage* message, unsigned char** buffer, size_t *buffer_size) {
*buffer_size = libp2p_message_protobuf_encode_size(message);
*buffer = malloc(*buffer_size);
if (!libp2p_message_protobuf_encode(message, *buffer, *buffer_size, buffer_size)) {
free(*buffer);
*buffer_size = 0;
return 0;
}
return 1;
}
/**
* Take existing stream and upgrade to the Kademlia / DHT protocol/codec
* @param context the context
@ -57,9 +76,7 @@ int libp2p_routing_dht_handshake(struct SessionContext* context) {
*/
int libp2p_routing_dht_handle_ping(struct Libp2pMessage* message, unsigned char** buffer, size_t *buffer_size) {
// just turn message back into a protobuf and send it back...
*buffer_size = libp2p_message_protobuf_encode_size(message);
*buffer = (unsigned char*)malloc(*buffer_size);
return libp2p_message_protobuf_encode(message, *buffer, *buffer_size, buffer_size);
return libp2p_routing_dht_protobuf_message(message, buffer, buffer_size);
}
/**
@ -95,12 +112,7 @@ int libp2p_routing_dht_handle_get_providers(struct SessionContext* session, stru
*/
if (message->provider_peer_head != NULL) {
// protobuf it and send it back
*results_size = libp2p_message_protobuf_encode_size(message);
*results = (unsigned char*)malloc(*results_size);
if (!libp2p_message_protobuf_encode(message, *results, *results_size, results_size)) {
free(*results);
*results = NULL;
*results_size = 0;
if (!libp2p_routing_dht_protobuf_message(message, results, results_size)) {
return 0;
}
}
@ -184,13 +196,9 @@ int libp2p_routing_dht_handle_add_provider(struct SessionContext* session, struc
goto exit;
}
*result_buffer_size = libp2p_message_protobuf_encode_size(message);
*result_buffer = (unsigned char*)malloc(*result_buffer_size);
if (*result_buffer == NULL)
if (!libp2p_routing_dht_protobuf_message(message, result_buffer, result_buffer_size)) {
goto exit;
if (!libp2p_message_protobuf_encode(message, *result_buffer, *result_buffer_size, result_buffer_size))
goto exit;
libp2p_logger_debug("dht_protocol", "add_provider protobuf'd the message. Returning results.\n");
}
retVal = 1;
exit:
@ -220,8 +228,31 @@ int libp2p_routing_dht_handle_add_provider(struct SessionContext* session, struc
int libp2p_routing_dht_handle_get_value(struct SessionContext* session, struct Libp2pMessage* message,
struct Peerstore* peerstore, struct ProviderStore* providerstore, unsigned char** result_buffer, size_t *result_buffer_size) {
//TODO: implement this
struct Datastore* datastore = session->datastore;
size_t data_size = 65535;
char* data = malloc(data_size);
if (!datastore->datastore_get(message->key, message->key_size, data, data_size, &data_size, datastore)) {
free(data);
return 0;
}
struct Libp2pRecord *record = libp2p_record_new();
record->key_size = message->key_size;
record->key = malloc(record->key_size);
memcpy(record->key, message->key, record->key_size);
record->value_size = data_size;
record->value = malloc(record->value_size);
memcpy(record->value, data, record->value_size);
message->record = record;
free(data);
if (!libp2p_routing_dht_protobuf_message(message, result_buffer, result_buffer_size)) {
libp2p_record_free(record);
message->record = NULL;
return 0;
}
return 1;
}
/**
* Put something in the dht datastore
@ -255,14 +286,10 @@ int libp2p_routing_dht_handle_find_node(struct SessionContext* session, struct L
struct Libp2pPeer* peer = libp2p_peerstore_get_peer(peerstore, message->key, message->key_size);
if (peer != NULL) {
message->closer_peer_head = peer->addr_head;
*result_buffer_size = libp2p_message_protobuf_encode_size(message);
*result_buffer = (unsigned char*)malloc(*result_buffer_size);
if (libp2p_message_protobuf_encode(message, *result_buffer, *result_buffer_size, result_buffer_size)) {
return 1;
if (!libp2p_routing_dht_protobuf_message(message, result_buffer, result_buffer_size)) {
return 0;
}
free(*result_buffer);
*result_buffer = NULL;
*result_buffer_size = 0;
return 1;
}
return 0;
}