func (r *RadosIoCtx) GetXattr(oid, name string) (string, error) {
var buf [MAX_XATTR_LEN]C.char
cname := C.CString(name)
coid := C.CString(oid)
defer func() {
C.free(unsafe.Pointer(cname))
C.free(unsafe.Pointer(coid))
}()
cerr := C.rados_getxattr(*r.ctx, coid, cname, &buf[0], MAX_XATTR_LEN)
if cerr < 0 {
return "", errors.New("get xattr failed")
}
return C.GoString(&buf[0]), nil
}
// Get an xattr for an object identified by its key.
func (c *Context) GetXattr(key, name string) ([]byte, error) {
ckey := C.CString(key)
defer C.free(unsafe.Pointer(ckey))
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
buf := (*C.char)(C.malloc(512))
defer C.free(unsafe.Pointer(buf))
ret := C.rados_getxattr(c.ctx, ckey, cname, buf, C.size_t(512))
if ret < 0 {
return nil, radosReturnCodeError(ret)
}
return C.GoBytes(unsafe.Pointer(buf), ret), nil
}
// Attribute returns an extended attribute of the object.
func (o *Object) Attribute(attributeName string) (io.Reader, error) {
object := C.CString(o.name)
attribute := C.CString(attributeName)
defer freeString(object)
defer freeString(attribute)
bufLen := 2048
bufAddr := bufferAddress(bufLen)
ret := C.rados_getxattr(o.ioContext, object, attribute, bufAddr, C.size_t(bufLen))
if err := toRadosError(ret); err != nil {
err.Message = fmt.Sprintf("Unable to get attribute %s of object %s.", attributeName, o.name)
return nil, err
}
attribbuf := bufToReader(bufAddr, ret)
return attribbuf, nil
}
// GetXattr gets an xattr with key `name`, it returns the length of
// the key read or an error if not successful
func (ioctx *IOContext) GetXattr(object string, name string, data []byte) (int, error) {
c_object := C.CString(object)
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_object))
defer C.free(unsafe.Pointer(c_name))
ret := C.rados_getxattr(
ioctx.ioctx,
c_object,
c_name,
(*C.char)(unsafe.Pointer(&data[0])),
(C.size_t)(len(data)))
if ret >= 0 {
return int(ret), nil
} else {
return 0, GetRadosError(ret)
}
}