NAME¶

mtbl_source - obtain key-value entries from a data source

SYNOPSIS¶

#include <mtbl.h>

struct mtbl_iter *
mtbl_source_iter(const struct mtbl_source *s);

struct mtbl_iter *
mtbl_source_get(const struct mtbl_source *s, const uint8_t *key, size_t len_key);

struct mtbl_iter *
mtbl_source_get_prefix(
        const struct mtbl_source *s,
        const uint8_t *prefix, size_t len_prefix);

struct mtbl_iter *
mtbl_source_get_range(
        const struct mtbl_source *s,
        const uint8_t *key0, size_t len_key0,
        const uint8_t *key1, size_t len_key1);

mtbl_res
mtbl_source_write(const struct mtbl_source *s, struct mtbl_writer *w);

void
mtbl_source_destroy(struct mtbl_source **s);

DESCRIPTION¶

The mtbl_source iterface provides an abstraction for reading key-value entries from mtbl data sources. mtbl_source_iter() provides an iterator over all of the entries in the data source. mtbl_source_get() provides an exact match iterator which returns all entries whose key matches the key provided in the arguments key and len_key. mtbl_source_get_prefix() provides a prefix iterator which returns all entries whose keys start with prefix and are at least len_prefix bytes long. mtbl_source_get_range() provides a range iterator which returns all entries whose keys are between key0 and key1 inclusive. mtbl_source_write() is a convenience function for reading all of the entries from a source and writing them to an mtbl_writer object. It is equivalent to calling mtbl_writer_add() on all of the entries returned from mtbl_source_iter().

RETURN VALUE¶

mtbl_source_iter(), mtbl_source_get(), mtbl_source_get_prefix(), and mtbl_source_get_range() return mtbl_iter objects. mtbl_source_write() returns mtbl_res_success if all of the entries in the data source were successfully written to the mtbl_writer argument, and mtbl_res_failure otherwise.

SEE ALSO¶

mtbl_iter(3)