76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/**
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* A basic storage building block of the IPFS system
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*/
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#include "ipfs/merkledag/merkledag.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 cid the resultant cid that was added
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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) {
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// taken from merkledag.go line 59
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struct Block* block = NULL;
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// protobuf the node
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size_t protobuf_len = ipfs_node_protobuf_encode_size(node);
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size_t bytes_written = 0;
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unsigned char protobuf[protobuf_len];
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ipfs_node_protobuf_encode(node, protobuf, protobuf_len, &bytes_written);
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// turn the node into a block
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ipfs_blocks_block_new(&block);
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ipfs_blocks_block_add_data(protobuf, bytes_written, block);
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// write to block store & datastore
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int retVal = ipfs_repo_fsrepo_block_write(block, fs_repo);
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if (retVal == 0) {
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ipfs_blocks_block_free(block);
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return 0;
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}
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ipfs_node_set_cached(node, block->cid);
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if (block != NULL)
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ipfs_blocks_block_free(block);
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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 cid
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* @param cid the key to look for
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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 struct Cid* cid, 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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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*)cid->hash, cid->hash_length, 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 block from the blockstore
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retVal = ipfs_repo_fsrepo_block_read(cid, &block, fs_repo);
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// now convert the block into a node
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ipfs_node_protobuf_decode(block->data, block->data_length, node);
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// doesn't decode do this?
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ipfs_node_set_cached(*node, cid);
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// free resources
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ipfs_blocks_block_free(block);
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return retVal;
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}
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