rocksdb.c

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#include "config.h"
#include <rocksdb/c.h>
#include <stdbool.h>
#include <stddef.h>
#include "mutt/lib.h"
#include "lib.h"
 
struct RocksDbStoreData
{
  rocksdb_t *db;
  rocksdb_options_t *options;
  rocksdb_readoptions_t *read_options;
  rocksdb_writeoptions_t *write_options;
  char *err;
};
 
static void rocksdb_sdata_free(struct RocksDbStoreData **ptr)
{
  if (!ptr || !*ptr)
    return;
 
  struct RocksDbStoreData *sdata = *ptr;
  FREE(&sdata->err);
 
  FREE(ptr);
}
 
static struct RocksDbStoreData *rocksdb_sdata_new(void)
{
  return MUTT_MEM_CALLOC(1, struct RocksDbStoreData);
}
 
static StoreHandle *store_rocksdb_open(const char *path, bool create)
{
  if (!path)
    return NULL;
 
  struct RocksDbStoreData *sdata = rocksdb_sdata_new();
 
  /* RocksDB stores errors in form of strings */
  sdata->err = NULL;
 
  /* setup generic options, create new db and limit log to one file */
  sdata->options = rocksdb_options_create();
  if (create)
  {
    rocksdb_options_set_create_if_missing(sdata->options, 1);
  }
  rocksdb_options_set_keep_log_file_num(sdata->options, 1);
 
  /* setup read options, we verify with checksums */
  sdata->read_options = rocksdb_readoptions_create();
  rocksdb_readoptions_set_verify_checksums(sdata->read_options, 1);
 
  /* setup write options, no sync needed, disable WAL */
  sdata->write_options = rocksdb_writeoptions_create();
  rocksdb_writeoptions_set_sync(sdata->write_options, 0);
  rocksdb_writeoptions_disable_WAL(sdata->write_options, 1);
 
  rocksdb_options_set_compression(sdata->options, rocksdb_no_compression);
 
  /* open database and check for error in sdata->error */
  sdata->db = rocksdb_open(sdata->options, path, &sdata->err);
  if (sdata->err)
  {
    rocksdb_options_destroy(sdata->options);
    rocksdb_readoptions_destroy(sdata->read_options);
    rocksdb_writeoptions_destroy(sdata->write_options);
    rocksdb_sdata_free(&sdata);
    return NULL;
  }
 
  // Return an opaque pointer
  return (StoreHandle *) sdata;
}
 
static void *store_rocksdb_fetch(StoreHandle *store, const char *key, size_t klen, size_t *vlen)
{
  if (!store)
    return NULL;
 
  // Decloak an opaque pointer
  struct RocksDbStoreData *sdata = store;
 
  void *rv = rocksdb_get(sdata->db, sdata->read_options, key, klen, vlen, &sdata->err);
  if (sdata->err)
  {
    rocksdb_free(sdata->err);
    sdata->err = NULL;
    return NULL;
  }
 
  return rv;
}
 
static void store_rocksdb_free(StoreHandle *store, void **ptr)
{
  FREE(ptr);
}
 
static int store_rocksdb_store(StoreHandle *store, const char *key, size_t klen,
                               void *value, size_t vlen)
{
  if (!store)
    return -1;
 
  // Decloak an opaque pointer
  struct RocksDbStoreData *sdata = store;
 
  rocksdb_put(sdata->db, sdata->write_options, key, klen, value, vlen, &sdata->err);
  if (sdata->err)
  {
    rocksdb_free(sdata->err);
    sdata->err = NULL;
    return -1;
  }
 
  return 0;
}
 
static int store_rocksdb_delete_record(StoreHandle *store, const char *key, size_t klen)
{
  if (!store)
    return -1;
 
  // Decloak an opaque pointer
  struct RocksDbStoreData *sdata = store;
 
  rocksdb_delete(sdata->db, sdata->write_options, key, klen, &sdata->err);
  if (sdata->err)
  {
    rocksdb_free(sdata->err);
    sdata->err = NULL;
    return -1;
  }
 
  return 0;
}
 
static void store_rocksdb_close(StoreHandle **ptr)
{
  if (!ptr || !*ptr)
    return;
 
  // Decloak an opaque pointer
  struct RocksDbStoreData *sdata = *ptr;
 
  /* close database and free resources */
  rocksdb_close(sdata->db);
  rocksdb_options_destroy(sdata->options);
  rocksdb_readoptions_destroy(sdata->read_options);
  rocksdb_writeoptions_destroy(sdata->write_options);
 
  rocksdb_sdata_free((struct RocksDbStoreData **) ptr);
}
 
static const char *store_rocksdb_version(void)
{
/* return sth. like "RocksDB 6.7.3" */
#define RDBVER(major, minor, patch) #major "." #minor "." #patch
  return "RocksDB " RDBVER(ROCKSDB_MAJOR, ROCKSDB_MINOR, ROCKSDB_PATCH);
}
 
STORE_BACKEND_OPS(rocksdb)