forked from containers/build
/
parse.go
130 lines (118 loc) · 3.16 KB
/
parse.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 discovery
import (
"fmt"
"net/url"
"strings"
"github.com/appc/spec/schema/common"
"github.com/appc/spec/schema/types"
)
type App struct {
Name types.ACIdentifier
Labels map[types.ACIdentifier]string
}
func NewApp(name string, labels map[types.ACIdentifier]string) (*App, error) {
if labels == nil {
labels = make(map[types.ACIdentifier]string, 0)
}
acn, err := types.NewACIdentifier(name)
if err != nil {
return nil, err
}
return &App{
Name: *acn,
Labels: labels,
}, nil
}
// NewAppFromString takes a command line app parameter and returns a map of labels.
//
// Example app parameters:
// example.com/reduce-worker:1.0.0
// example.com/reduce-worker,channel=alpha,label=value
// example.com/reduce-worker:1.0.0,label=value
//
// As can be seen in above examples - colon, comma and equal sign have
// special meaning. If any of them has to be a part of a label's value
// then consider writing your own string to App parser.
func NewAppFromString(app string) (*App, error) {
var (
name string
labels map[types.ACIdentifier]string
)
preparedApp, err := prepareAppString(app)
if err != nil {
return nil, err
}
v, err := url.ParseQuery(preparedApp)
if err != nil {
return nil, err
}
labels = make(map[types.ACIdentifier]string, 0)
for key, val := range v {
if len(val) > 1 {
return nil, fmt.Errorf("label %s with multiple values %q", key, val)
}
if key == "name" {
name = val[0]
continue
}
labelName, err := types.NewACIdentifier(key)
if err != nil {
return nil, err
}
labels[*labelName] = val[0]
}
a, err := NewApp(name, labels)
if err != nil {
return nil, err
}
return a, nil
}
func prepareAppString(app string) (string, error) {
if err := checkColon(app); err != nil {
return "", err
}
app = "name=" + strings.Replace(app, ":", ",version=", 1)
return common.MakeQueryString(app)
}
func checkColon(app string) error {
firstComma := strings.IndexRune(app, ',')
firstColon := strings.IndexRune(app, ':')
if firstColon > firstComma && firstComma > -1 {
return fmt.Errorf("malformed app string - colon may appear only right after the app name")
}
if strings.Count(app, ":") > 1 {
return fmt.Errorf("malformed app string - colon may appear at most once")
}
return nil
}
func (a *App) Copy() *App {
ac := &App{
Name: a.Name,
Labels: make(map[types.ACIdentifier]string, 0),
}
for k, v := range a.Labels {
ac.Labels[k] = v
}
return ac
}
// String returns the URL-like image name
func (a *App) String() string {
img := a.Name.String()
for n, v := range a.Labels {
img += fmt.Sprintf(",%s=%s", n, v)
}
return img
}