/
empty.go
62 lines (51 loc) · 1.46 KB
/
empty.go
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// Copyright 2020 Anapaya Systems
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package empty
import (
"github.com/scionproto/scion/go/lib/serrors"
"github.com/scionproto/scion/go/lib/slayers/path"
)
// PathLen is the length of a serialized empty path in bytes
const PathLen = 0
const PathType path.Type = 0
func RegisterPath() {
path.RegisterPath(path.Metadata{
Type: PathType,
Desc: "Empty",
New: func() path.Path {
return Path{}
},
})
}
// Path encodes an empty path. An empty path is a special path that takes zero
// bytes on the wire and is used for AS internal communication.
type Path struct{}
func (o Path) DecodeFromBytes(r []byte) error {
if len(r) != 0 {
return serrors.New("decoding an empty path", "len", len(r))
}
return nil
}
func (o Path) SerializeTo(b []byte) error {
return nil
}
func (o Path) Reverse() (path.Path, error) {
return o, nil
}
func (o Path) Len() int {
return PathLen
}
func (o Path) Type() path.Type {
return PathType
}