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