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package hdfs
import (
"errors"
"fmt"
"os"
"strings"
hdfs "github.com/colinmarc/hdfs/v2/internal/protocol/hadoop_hdfs"
"google.golang.org/protobuf/proto"
)
var errXAttrKeysNotFound = errors.New("one or more keys not found")
const createAndReplace = 3
// ListXAttrs returns a list of all extended attributes for the given path.
// The returned keys will be in the form
func (c *Client) ListXAttrs(name string) (map[string]string, error) {
req := &hdfs.ListXAttrsRequestProto{Src: proto.String(name)}
resp := &hdfs.ListXAttrsResponseProto{}
err := c.namenode.Execute("listXAttrs", req, resp)
if err != nil {
return nil, &os.PathError{"list xattrs", name, interpretException(err)}
}
return xattrMap(resp.GetXAttrs()), nil
}
// GetXAttrs returns the extended attributes for the given path and list of
// keys. The keys should be prefixed by namespace, e.g. user.foo or trusted.bar.
func (c *Client) GetXAttrs(name string, keys ...string) (map[string]string, error) {
if len(keys) == 0 {
return make(map[string]string), nil
}
req := &hdfs.GetXAttrsRequestProto{Src: proto.String(name)}
for _, key := range keys {
ns, rest, err := splitKey(key)
if err != nil {
return nil, &os.PathError{"get xattrs", name, err}
}
req.XAttrs = append(req.XAttrs, &hdfs.XAttrProto{
Namespace: ns,
Name: proto.String(rest),
})
}
resp := &hdfs.GetXAttrsResponseProto{}
err := c.namenode.Execute("getXAttrs", req, resp)
if err != nil {
if isKeyNotFound(err) {
return nil, &os.PathError{"get xattrs", name, errXAttrKeysNotFound}
}
return nil, &os.PathError{"get xattrs", name, interpretException(err)}
}
return xattrMap(resp.GetXAttrs()), nil
}
// SetXAttr sets an extended attribute for the given path and key. If the
// attribute doesn't exist, it will be created.
func (c *Client) SetXAttr(name, key, value string) error {
resp := &hdfs.SetXAttrResponseProto{}
ns, rest, err := splitKey(key)
if err != nil {
return &os.PathError{"set xattr", name, err}
}
req := &hdfs.SetXAttrRequestProto{
Src: proto.String(name),
XAttr: &hdfs.XAttrProto{
Namespace: ns.Enum(),
Name: proto.String(rest),
Value: []byte(value),
},
Flag: proto.Uint32(createAndReplace),
}
err = c.namenode.Execute("setXAttr", req, resp)
if err != nil {
return &os.PathError{"set xattr", name, interpretException(err)}
}
return nil
}
// RemoveXAttr unsets an extended attribute for the given path and key. It
// returns an error if the attribute doesn't already exist.
func (c *Client) RemoveXAttr(name, key string) error {
ns, rest, err := splitKey(key)
if err != nil {
return &os.PathError{"remove xattr", name, err}
}
req := &hdfs.RemoveXAttrRequestProto{
Src: proto.String(name),
XAttr: &hdfs.XAttrProto{
Namespace: ns,
Name: proto.String(rest),
},
}
resp := &hdfs.RemoveXAttrResponseProto{}
err = c.namenode.Execute("removeXAttr", req, resp)
if err != nil {
if isKeyNotFound(err) {
return &os.PathError{"remove xattr", name, errXAttrKeysNotFound}
}
return &os.PathError{"remove xattr", name, interpretException(err)}
}
return nil
}
func splitKey(key string) (*hdfs.XAttrProto_XAttrNamespaceProto, string, error) {
parts := strings.SplitN(key, ".", 2)
if len(parts) < 2 {
return nil, "", fmt.Errorf("invalid key: '%s'", key)
}
var ns hdfs.XAttrProto_XAttrNamespaceProto
switch strings.ToLower(parts[0]) {
case "user":
ns = hdfs.XAttrProto_USER
case "trusted":
ns = hdfs.XAttrProto_TRUSTED
case "system":
ns = hdfs.XAttrProto_SYSTEM
case "security":
ns = hdfs.XAttrProto_SECURITY
case "raw":
ns = hdfs.XAttrProto_RAW
default:
return nil, "", fmt.Errorf("invalid key namespace: '%s'", parts[0])
}
return ns.Enum(), parts[1], nil
}
func xattrMap(attrs []*hdfs.XAttrProto) map[string]string {
m := make(map[string]string)
for _, xattr := range attrs {
key := fmt.Sprintf("%s.%s",
strings.ToLower(xattr.GetNamespace().String()), xattr.GetName())
m[key] = string(xattr.GetValue())
}
return m
}
func isKeyNotFound(err error) bool {
if remoteErr, ok := err.(Error); ok {
if strings.HasPrefix(remoteErr.Message(),
"At least one of the attributes provided was not found") {
return true
}
if strings.HasPrefix(remoteErr.Message(),
"No matching attributes found for remove operation") {
return true
}
}
return false
}
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