mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-18 12:20:24 +00:00
93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
package rados
|
|
|
|
// #cgo LDFLAGS: -lrados
|
|
// #include <rados/librados.h>
|
|
//
|
|
import "C"
|
|
|
|
// Iter supports iterating over objects in the ioctx.
|
|
type Iter struct {
|
|
ctx C.rados_list_ctx_t
|
|
err error
|
|
entry string
|
|
namespace string
|
|
}
|
|
|
|
// IterToken supports reporting on and seeking to different positions.
|
|
type IterToken uint32
|
|
|
|
// Iter returns a Iterator object that can be used to list the object names in the current pool
|
|
func (ioctx *IOContext) Iter() (*Iter, error) {
|
|
iter := Iter{}
|
|
if cerr := C.rados_nobjects_list_open(ioctx.ioctx, &iter.ctx); cerr < 0 {
|
|
return nil, getRadosError(int(cerr))
|
|
}
|
|
return &iter, nil
|
|
}
|
|
|
|
// Token returns a token marking the current position of the iterator. To be used in combination with Iter.Seek()
|
|
func (iter *Iter) Token() IterToken {
|
|
return IterToken(C.rados_nobjects_list_get_pg_hash_position(iter.ctx))
|
|
}
|
|
|
|
// Seek moves the iterator to the position indicated by the token.
|
|
func (iter *Iter) Seek(token IterToken) {
|
|
C.rados_nobjects_list_seek(iter.ctx, C.uint32_t(token))
|
|
}
|
|
|
|
// Next retrieves the next object name in the pool/namespace iterator.
|
|
// Upon a successful invocation (return value of true), the Value method should
|
|
// be used to obtain the name of the retrieved object name. When the iterator is
|
|
// exhausted, Next returns false. The Err method should used to verify whether the
|
|
// end of the iterator was reached, or the iterator received an error.
|
|
//
|
|
// Example:
|
|
// iter := pool.Iter()
|
|
// defer iter.Close()
|
|
// for iter.Next() {
|
|
// fmt.Printf("%v\n", iter.Value())
|
|
// }
|
|
// return iter.Err()
|
|
//
|
|
func (iter *Iter) Next() bool {
|
|
var c_entry *C.char
|
|
var c_namespace *C.char
|
|
if cerr := C.rados_nobjects_list_next(iter.ctx, &c_entry, nil, &c_namespace); cerr < 0 {
|
|
iter.err = getRadosError(int(cerr))
|
|
return false
|
|
}
|
|
iter.entry = C.GoString(c_entry)
|
|
iter.namespace = C.GoString(c_namespace)
|
|
return true
|
|
}
|
|
|
|
// Value returns the current value of the iterator (object name), after a successful call to Next.
|
|
func (iter *Iter) Value() string {
|
|
if iter.err != nil {
|
|
return ""
|
|
}
|
|
return iter.entry
|
|
}
|
|
|
|
// Namespace returns the namespace associated with the current value of the iterator (object name), after a successful call to Next.
|
|
func (iter *Iter) Namespace() string {
|
|
if iter.err != nil {
|
|
return ""
|
|
}
|
|
return iter.namespace
|
|
}
|
|
|
|
// Err checks whether the iterator has encountered an error.
|
|
func (iter *Iter) Err() error {
|
|
if iter.err == ErrNotFound {
|
|
return nil
|
|
}
|
|
return iter.err
|
|
}
|
|
|
|
// Close the iterator cursor on the server. Be aware that iterators are not closed automatically
|
|
// at the end of iteration.
|
|
func (iter *Iter) Close() {
|
|
C.rados_nobjects_list_close(iter.ctx)
|
|
}
|