tdb.c

Go to the documentation of this file.

 
#include "config.h"
#include <fcntl.h>
#include <stdbool.h>
#include <stddef.h>
#include <tdb.h>
#include "mutt/lib.h"
#include "lib.h"

static StoreHandle *store_tdb_open(const char *path, bool create)
{
  if (!path)
    return NULL;
 
  /* TDB_NOLOCK - Don't do any locking
   * TDB_NOSYNC - Don't use synchronous transactions
   * TDB_INCOMPATIBLE_HASH - Better hashing
   */
  const int flags = TDB_NOLOCK | TDB_INCOMPATIBLE_HASH | TDB_NOSYNC;
  const int hash_size = 33533; // Based on test timings for 100K emails
 
  struct tdb_context *db = tdb_open(path, hash_size, flags,
                                    (create ? O_CREAT : 0) | O_RDWR, 00600);
 
  // Return an opaque pointer
  return (StoreHandle *) db;
}

static void *store_tdb_fetch(StoreHandle *store, const char *key, size_t klen, size_t *vlen)
{
  if (!store)
    return NULL;
 
  // Decloak an opaque pointer
  TDB_CONTEXT *db = store;
  TDB_DATA dkey = { 0 };
  TDB_DATA data = { 0 };
 
  dkey.dptr = (unsigned char *) key;
  dkey.dsize = klen;
  data = tdb_fetch(db, dkey);
 
  *vlen = data.dsize;
  return data.dptr;
}

static void store_tdb_free(StoreHandle *store, void **ptr)
{
  FREE(ptr);
}

static int store_tdb_store(StoreHandle *store, const char *key, size_t klen,
                           void *value, size_t vlen)
{
  if (!store)
    return -1;
 
  // Decloak an opaque pointer
  TDB_CONTEXT *db = store;
  TDB_DATA dkey = { 0 };
  TDB_DATA databuf = { 0 };
 
  dkey.dptr = (unsigned char *) key;
  dkey.dsize = klen;
 
  databuf.dsize = vlen;
  databuf.dptr = value;
 
  return tdb_store(db, dkey, databuf, TDB_INSERT);
}

static int store_tdb_delete_record(StoreHandle *store, const char *key, size_t klen)
{
  if (!store)
    return -1;
 
  // Decloak an opaque pointer
  TDB_CONTEXT *db = store;
  TDB_DATA dkey = { 0 };
 
  dkey.dptr = (unsigned char *) key;
  dkey.dsize = klen;
 
  return tdb_delete(db, dkey);
}

static void store_tdb_close(StoreHandle **ptr)
{
  if (!ptr || !*ptr)
    return;
 
  // Decloak an opaque pointer
  TDB_CONTEXT *db = *ptr;
  tdb_close(db);
  *ptr = NULL;
}

static const char *store_tdb_version(void)
{
  // TDB doesn't supply any version info
  return "tdb";
}
 
STORE_BACKEND_OPS(tdb)