forked from scionproto/scion
/
aslist.go
75 lines (66 loc) · 1.97 KB
/
aslist.go
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// Copyright 2017 ETH Zurich
//
// 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 util
import (
"io/ioutil"
yaml "gopkg.in/yaml.v2"
"github.com/scionproto/scion/go/lib/addr"
"github.com/scionproto/scion/go/lib/common"
)
type asData struct {
Core []string `yaml:"Core"`
NonCore []string `yaml:"Non-core"`
}
type ASList struct {
Core []addr.IA
NonCore []addr.IA
}
// LoadASList parses the yaml file fileName and returns a structure with
// non-core and core ASes.
func LoadASList(fileName string) (*ASList, error) {
asList := &ASList{}
buffer, err := ioutil.ReadFile(fileName)
if err != nil {
return nil, common.NewBasicError("Unable to read from file", err, "name", fileName)
}
var locations asData
err = yaml.Unmarshal(buffer, &locations)
if err != nil {
return nil, common.NewBasicError("Unable to parse YAML data", err)
}
asList.Core, err = parse(locations.Core)
if err != nil {
return nil, err
}
asList.NonCore, err = parse(locations.NonCore)
if err != nil {
return nil, err
}
return asList, nil
}
func parse(names []string) ([]addr.IA, error) {
var iaList []addr.IA
for _, name := range names {
ia, err := addr.IAFromString(name)
if err != nil {
return nil, common.NewBasicError("Unable to parse AS Name", err, "ISDAS", name)
}
iaList = append(iaList, ia)
}
return iaList, nil
}
// AllASes returns all ASes in the ASList as a slice.
func (al *ASList) AllASes() []addr.IA {
return append([]addr.IA(nil), append(al.Core, al.NonCore...)...)
}