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labels.go
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labels.go
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// Copyright 2015 The appc Authors
//
// 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 types
import (
"encoding/json"
"fmt"
"sort"
)
var ValidOSArch = map[string][]string{
"linux": {"amd64", "i386", "aarch64", "aarch64_be", "armv6l", "armv7l", "armv7b"},
"freebsd": {"amd64", "i386", "arm"},
"darwin": {"x86_64", "i386"},
}
type Labels []Label
type labels Labels
type Label struct {
Name ACIdentifier `json:"name"`
Value string `json:"value"`
}
// IsValidOsArch checks if a OS-architecture combination is valid given a map
// of valid OS-architectures
func IsValidOSArch(labels map[ACIdentifier]string, validOSArch map[string][]string) error {
if os, ok := labels["os"]; ok {
if validArchs, ok := validOSArch[os]; !ok {
// Not a whitelisted OS. TODO: how to warn rather than fail?
validOses := make([]string, 0, len(validOSArch))
for validOs := range validOSArch {
validOses = append(validOses, validOs)
}
sort.Strings(validOses)
return fmt.Errorf(`bad os %#v (must be one of: %v)`, os, validOses)
} else {
// Whitelisted OS. We check arch here, as arch makes sense only
// when os is defined.
if arch, ok := labels["arch"]; ok {
found := false
for _, validArch := range validArchs {
if arch == validArch {
found = true
break
}
}
if !found {
return fmt.Errorf(`bad arch %#v for %v (must be one of: %v)`, arch, os, validArchs)
}
}
}
}
return nil
}
func (l Labels) assertValid() error {
seen := map[ACIdentifier]string{}
for _, lbl := range l {
if lbl.Name == "name" {
return fmt.Errorf(`invalid label name: "name"`)
}
_, ok := seen[lbl.Name]
if ok {
return fmt.Errorf(`duplicate labels of name %q`, lbl.Name)
}
seen[lbl.Name] = lbl.Value
}
return IsValidOSArch(seen, ValidOSArch)
}
func (l Labels) MarshalJSON() ([]byte, error) {
if err := l.assertValid(); err != nil {
return nil, err
}
return json.Marshal(labels(l))
}
func (l *Labels) UnmarshalJSON(data []byte) error {
var jl labels
if err := json.Unmarshal(data, &jl); err != nil {
return err
}
nl := Labels(jl)
if err := nl.assertValid(); err != nil {
return err
}
*l = nl
return nil
}
// Get retrieves the value of the label by the given name from Labels, if it exists
func (l Labels) Get(name string) (val string, ok bool) {
for _, lbl := range l {
if lbl.Name.String() == name {
return lbl.Value, true
}
}
return "", false
}
// ToMap creates a map[ACIdentifier]string.
func (l Labels) ToMap() map[ACIdentifier]string {
labelsMap := make(map[ACIdentifier]string)
for _, lbl := range l {
labelsMap[lbl.Name] = lbl.Value
}
return labelsMap
}
// LabelsFromMap creates Labels from a map[ACIdentifier]string
func LabelsFromMap(labelsMap map[ACIdentifier]string) (Labels, error) {
labels := Labels{}
for n, v := range labelsMap {
labels = append(labels, Label{Name: n, Value: v})
}
if err := labels.assertValid(); err != nil {
return nil, err
}
return labels, nil
}