lander/lsm/include/lsm.h

#ifndef LSM
#define LSM

#include <stdint.h>

#define LSM_RES(x)                                                             \
  {                                                                            \
    lsm_error res = x;                                                         \
    if (res != lsm_error_ok)                                                   \
      return res;                                                              \
  }

#define LSM_RES2(x, e)                                                         \
  {                                                                            \
    lsm_error res = x;                                                         \
    if (res != lsm_error_ok) {                                                 \
      e;                                                                       \
      return res;                                                              \
    }                                                                          \
  }

#define LSM_MAX(x, y) ((x) > (y) ? (x) : (y))

typedef enum lsm_error {
  lsm_error_ok = 0,
  lsm_error_failed_alloc = 1,
  lsm_error_not_found = 2,
  lsm_error_already_present = 3,
  lsm_error_null_value = 4,
  lsm_error_failed_io = 5,
  lsm_error_lock_busy = 6,
} lsm_error;

/*typedef struct lsm_string { */
/*  uint64_t len; */
/*  union { */
/*    void *ptr; */
/*    char val[8]; */
/*  } str; */
/*} lsm_string; */

/*/1** */
/* * The type of an attribute. Each type is represented as a single bit of a */
/* * 32-bit integer, so they can be easily combined into a bitmap. */
/* *1/ */
/*typedef enum lsm_attr_type { lsm_attr_type_entry_type = 1 << 0 }
 * lsm_attr_type; */

/*/1** */
/* * A single attribute associated with an entry */
/* *1/ */
/*typedef struct lsm_attr { */
/*  lsm_attr_type type; */
/*  lsm_string str; */
/*} lsm_attr; */

/*/1** */
/* * Represents a collection of attributes for an entry. A collection can only
 */
/* * contain one of each attribute. */
/* *1/ */
/*typedef struct lsm_attr_list { */
/*  uint64_t count; */
/*  lsm_attr *items; */
/*  uint32_t bitmap; */
/*} lsm_attr_list; */

/*/1** */
/* * An entry inside an LSM store */
/* *1/ */
/*typedef struct lsm_entry { */
/*  lsm_string key; */
/*  lsm_attr_list attrs; */
/*  lsm_string data; */
/*} lsm_entry; */

/*/1** */
/* * A store of entries, which manages its data both in-memory and on disk. */
/* *1/ */
/*typedef struct lsm_store lsm_store; */

#endif