func (f *futureKey) Get() (Key, error) {
f.o.Do(func() {
var value *C.uint8_t
var length C.int
f.BlockUntilReady()
if err := C.fdb_future_get_key(f.ptr, &value, &length); err != 0 {
f.e = Error{int(err)}
} else {
f.k = C.GoBytes(unsafe.Pointer(value), length)
}
C.fdb_future_release_memory(f.ptr)
})
return f.k, f.e
}
// GetWithError returns a database key or an error if the asynchronous operation
// associated with this future did not successfully complete. The current
// goroutine will be blocked until the future is ready.
func (f FutureKey) GetWithError() (Key, error) {
if f.k != nil {
return f.k, nil
}
var value *C.uint8_t
var length C.int
fdb_future_block_until_ready(f.ptr)
if err := C.fdb_future_get_key(f.ptr, &value, &length); err != 0 {
if err == 2017 {
return f.k, nil
} else {
return nil, Error(err)
}
}
f.k = C.GoBytes(unsafe.Pointer(value), length)
C.fdb_future_release_memory(f.ptr)
return f.k, nil
}