117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/***
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* Here are the wrappers for the lightning database
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*/
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#include "lmdb.h"
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#include "ipfs/repo/fsrepo/lmdb_datastore.h"
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/**
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* Write a block to the datastore with the specified key
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* @param key the key
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* @param block the block to be written
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* @returns true(1) on success
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*/
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int repo_fsrepo_lmdb_put(const char* key, struct Block* block, struct Datastore* datastore) {
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int retVal;
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MDB_txn* mdb_txn;
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MDB_dbi mdb_dbi;
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struct MDB_val db_key;
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struct MDB_val db_value;
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MDB_env* mdb_env = (MDB_env*)datastore->handle;
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if (mdb_env == NULL)
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return 0;
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// open transaction
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retVal = mdb_txn_begin(mdb_env, NULL, 0, &mdb_txn);
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if (retVal != 0)
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return 0;
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retVal = mdb_dbi_open(mdb_txn, NULL, 0, &mdb_dbi);
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if (retVal != 0)
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return 0;
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// write
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db_key.mv_size = strlen(key) + 1;
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db_key.mv_data = (char*)key;
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db_value.mv_size = block->data_length;
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db_value.mv_data = block->data;
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retVal = mdb_put(mdb_txn, mdb_dbi, &db_key, &db_value, MDB_NODUPDATA);
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if (retVal != 0)
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return 0;
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// cleanup
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mdb_dbi_close(mdb_env, mdb_dbi);
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mdb_txn_commit(mdb_txn);
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return 1;
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}
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/**
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* Open an lmdb database with the given parameters.
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* Note: for now, the parameters are not used
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* @param argc number of parameters in the following array
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* @param argv an array of parameters
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*/
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int repo_fsrepro_lmdb_open(int argc, char** argv, struct Datastore* datastore) {
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// create environment
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struct MDB_env* mdb_env;
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int retVal = mdb_env_create(&mdb_env);
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if (retVal < 0) {
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mdb_env_close(mdb_env);
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return 0;
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}
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// open the environment
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retVal = mdb_env_open(mdb_env, datastore->path, 0, S_IRWXU);
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if (retVal < 0) {
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mdb_env_close(mdb_env);
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return 0;
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}
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datastore->handle = (void*)mdb_env;
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return 1;
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}
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/***
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* Close an LMDB database
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* NOTE: for now, argc and argv are not used
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* @param argc number of parameters in the argv array
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* @param argv parameters to be passed in
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* @param datastore the datastore struct that contains information about the opened database
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*/
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int repo_fsrepo_lmdb_close(int argc, char** argv, struct Datastore* datastore) {
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struct MDB_env* mdb_env = (struct MDB_env*)datastore->handle;
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mdb_env_close(mdb_env);
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free(mdb_env);
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return 1;
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}
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/***
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* Places the LMDB methods into the datastore's function pointers
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* @param datastore the datastore to fill
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* @returns true(1) on success;
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*/
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int repo_fsrepo_lmdb_cast(struct Datastore* datastore) {
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datastore->datastore_open = &repo_fsrepro_lmdb_open;
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datastore->datastore_close = &repo_fsrepo_lmdb_close;
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datastore->datastore_put = &repo_fsrepo_lmdb_put;
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//datastore->datastore_get = &repo_fsrepo_lmdb_get;
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return 1;
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}
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/***
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* Creates the directory
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* @param datastore contains the path that needs to be created
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* @returns true(1) on success
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*/
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int repo_fsrepo_lmdb_create_directory(struct Datastore* datastore) {
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return mkdir(datastore->path, S_IRWXU) == 0;
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}
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