94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/**
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* A basic storage building block of the IPFS system
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libp2p/crypto/sha256.h"
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#include "ipfs/merkledag/merkledag.h"
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#include "ipfs/unixfs/unixfs.h"
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/***
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* Adds a node to the dagService and blockService
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* @param node the node to add
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* @param fs_repo the repo to add to
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* @param bytes_written the number of bytes written
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* @returns true(1) on success
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*/
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int ipfs_merkledag_add(struct Node* node, struct FSRepo* fs_repo, size_t* bytes_written) {
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// taken from merkledag.go line 59
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int retVal = 0;
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// compute the hash
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size_t protobuf_size = ipfs_node_protobuf_encode_size(node);
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unsigned char protobuf[protobuf_size];
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size_t bytes_encoded;
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retVal = ipfs_node_protobuf_encode(node, protobuf, protobuf_size, &bytes_encoded);
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node->hash_size = 32;
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node->hash = (unsigned char*)malloc(node->hash_size);
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if (node->hash == NULL) {
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return 0;
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}
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if (libp2p_crypto_hashing_sha256(protobuf, bytes_encoded, &node->hash[0]) == 0) {
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free(node->hash);
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return 0;
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}
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// write to block store & datastore
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retVal = ipfs_repo_fsrepo_node_write(node, fs_repo, bytes_written);
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if (retVal == 0) {
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return 0;
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}
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// TODO: call HasBlock (unsure why as yet)
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return 1;
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}
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/***
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* Retrieves a node from the datastore based on the hash
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* @param hash the key to look for
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* @param hash_size the length of the key
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* @param node the node to be created
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* @param fs_repo the repository
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* @returns true(1) on success
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*/
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int ipfs_merkledag_get(const unsigned char* hash, size_t hash_size, struct Node** node, const struct FSRepo* fs_repo) {
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int retVal = 1;
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//struct Block* block;
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struct UnixFS* unix_fs;
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size_t key_length = 100;
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unsigned char key[key_length];
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// look for the node in the datastore. If it is not there, it is not a node.
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// If it exists, it is only a block.
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retVal = fs_repo->config->datastore->datastore_get((char*)hash, hash_size, key, key_length, &key_length, fs_repo->config->datastore);
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if (retVal == 0)
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return 0;
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// we have the record from the db. Go get the UnixFS from the blockstore
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retVal = ipfs_repo_fsrepo_unixfs_read(hash, hash_size, &unix_fs, fs_repo);
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if (retVal == 0) {
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return 0;
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}
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// now convert the block into a node
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if (ipfs_node_protobuf_decode(unix_fs->bytes, unix_fs->bytes_size, node) == 0) {
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ipfs_unixfs_free(unix_fs);
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return 0;
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}
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// set the cid on the node
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if (ipfs_node_set_hash(*node, hash, hash_size) == 0) {
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ipfs_unixfs_free(unix_fs);
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ipfs_node_free(*node);
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return 0;
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}
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// free resources
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ipfs_unixfs_free(unix_fs);
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return 1;
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}
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