// NewIterators returns an array of iterators
// corresponding to the given column families for a given db
// iterators is allocated by this method -> responsibility of
// caller to destroy the underlying c objects
// opts, db, cfs will not be destroyed -> resonsibility of caller
func NewIterators(
opts *gorocksdb.ReadOptions,
db *gorocksdb.DB,
cfHandles []*gorocksdb.ColumnFamilyHandle,
) ([]*gorocksdb.Iterator, error) {
size := len(cfHandles)
cCFHandles := make([]*C.rocksdb_column_family_handle_t, size, size)
for i, cfHandle := range cfHandles {
cCFHandles[i] = (*C.rocksdb_column_family_handle_t)(cfHandle.UnsafeGetCFHandler())
}
iters := make([]*C.rocksdb_iterator_t, size, size)
var cErr *C.char
C.get_iterators(
(*C.rocksdb_readoptions_t)(opts.UnsafeGetReadOptions()),
(*C.rocksdb_t)(db.UnsafeGetDB()),
&cCFHandles[0],
&iters[0],
C.int(size),
&cErr,
)
if cErr != nil {
defer C.free(unsafe.Pointer(cErr))
return nil, errors.New(C.GoString(cErr))
}
var iterators []*gorocksdb.Iterator
for _, iter := range iters {
iterators = append(
iterators,
gorocksdb.NewNativeIterator(unsafe.Pointer(iter)),
)
}
return iterators, nil
}
// CreateCheckpoint creates an openable snapshot of the db
// db is not destroyed -> responsibility of the caller
func CreateCheckpoint(db *gorocksdb.DB, checkpointDir string) error {
cCheckpointDir := C.CString(checkpointDir)
defer C.free(unsafe.Pointer(cCheckpointDir))
var cErr *C.char
C.create_checkpoint(
(*C.rocksdb_t)(db.UnsafeGetDB()),
cCheckpointDir,
&cErr,
)
if cErr != nil {
defer C.free(unsafe.Pointer(cErr))
return errors.New(C.GoString(cErr))
}
return nil
}