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appjson.go
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appjson.go
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package appjson
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
kerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/printers"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl/scheme"
templatev1 "github.com/openshift/api/template/v1"
"github.com/openshift/origin/pkg/oc/lib/newapp/appjson"
appcmd "github.com/openshift/origin/pkg/oc/lib/newapp/cmd"
"github.com/openshift/origin/pkg/oc/util/ocscheme"
templateapi "github.com/openshift/origin/pkg/template/apis/template"
templateapiv1 "github.com/openshift/origin/pkg/template/apis/template/v1"
templatev1client "github.com/openshift/origin/pkg/template/client/v1"
)
const AppJSONV1GeneratorName = "app-json/v1"
var (
appJSONLong = templates.LongDesc(`
Import app.json files as OpenShift objects
app.json defines the pattern of a simple, stateless web application that can be horizontally scaled.
This command will transform a provided app.json object into its OpenShift equivalent.
During transformation fields in the app.json syntax that are not relevant when running on top of
a containerized platform will be ignored and a warning printed.
The command will create objects unless you pass the -o yaml or --as-template flags to generate a
configuration file for later use.
Experimental: This command is under active development and may change without notice.`)
appJSONExample = templates.Examples(`
# Import a directory containing an app.json file
$ %[1]s app.json -f .
# Turn an app.json file into a template
$ %[1]s app.json -f ./app.json -o yaml --as-template`)
)
type AppJSONOptions struct {
PrintFlags *genericclioptions.PrintFlags
Printer printers.ResourcePrinter
BaseImage string
Generator string
AsTemplate string
OutputVersionStr string
OutputVersions []schema.GroupVersion
Namespace string
RESTMapper meta.RESTMapper
DynamicClient dynamic.Interface
Client rest.Interface
genericclioptions.IOStreams
resource.FilenameOptions
}
func NewAppJSONOptions(streams genericclioptions.IOStreams) *AppJSONOptions {
return &AppJSONOptions{
IOStreams: streams,
PrintFlags: genericclioptions.NewPrintFlags("created").WithTypeSetter(ocscheme.PrintingInternalScheme),
Generator: AppJSONV1GeneratorName,
}
}
// NewCmdAppJSON imports an app.json file (schema described here: https://devcenter.heroku.com/articles/app-json-schema)
// as a template.
func NewCmdAppJSON(fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewAppJSONOptions(streams)
cmd := &cobra.Command{
Use: "app.json -f APPJSON",
Short: "Import an app.json definition into OpenShift (experimental)",
Long: appJSONLong,
Example: fmt.Sprintf(appJSONExample, fullName),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.Complete(f, cmd, args))
kcmdutil.CheckErr(o.Validate())
kcmdutil.CheckErr(o.Run())
},
}
usage := "Filename, directory, or URL to app.json file to use"
kcmdutil.AddJsonFilenameFlag(cmd.Flags(), &o.Filenames, usage)
cmd.MarkFlagRequired("filename")
cmd.Flags().StringVar(&o.BaseImage, "image", o.BaseImage, "An optional image to use as your base Docker build (must have ONBUILD directives)")
cmd.Flags().StringVar(&o.Generator, "generator", o.Generator, "The name of the generator strategy to use - specify this value to for backwards compatibility.")
cmd.Flags().StringVar(&o.AsTemplate, "as-template", o.AsTemplate, "If set, generate a template with the provided name")
cmd.Flags().StringVar(&o.OutputVersionStr, "output-version", o.OutputVersionStr, "The preferred API versions of the output objects")
o.PrintFlags.AddFlags(cmd)
return cmd
}
func (o *AppJSONOptions) createResources(list *corev1.List) (*corev1.List, []error) {
errors := []error{}
created := &corev1.List{}
for i, item := range list.Items {
var err error
unstructuredObj := &unstructured.Unstructured{}
unstructuredObj.Object, err = runtime.DefaultUnstructuredConverter.ToUnstructured(item)
if err != nil {
errors = append(errors, err)
continue
}
mapping, err := o.RESTMapper.RESTMapping(unstructuredObj.GroupVersionKind().GroupKind(), unstructuredObj.GroupVersionKind().Version)
if err != nil {
errors = append(errors, err)
continue
}
_, err = o.DynamicClient.Resource(mapping.Resource).Namespace(o.Namespace).Create(unstructuredObj)
if err != nil {
errors = append(errors, err)
continue
}
created.Items = append(created.Items, list.Items[i])
}
return created, errors
}
func (o *AppJSONOptions) Complete(f kcmdutil.Factory, cmd *cobra.Command, args []string) error {
for _, v := range strings.Split(o.OutputVersionStr, ",") {
gv, err := schema.ParseGroupVersion(v)
if err != nil {
return fmt.Errorf("provided output-version %q is not valid: %v", v, err)
}
o.OutputVersions = append(o.OutputVersions, gv)
}
o.OutputVersions = append(o.OutputVersions, scheme.Scheme.PrioritizedVersionsAllGroups()...)
clientConfig, err := f.ToRESTConfig()
if err != nil {
return err
}
o.RESTMapper, err = f.ToRESTMapper()
if err != nil {
return err
}
o.DynamicClient, err = dynamic.NewForConfig(clientConfig)
o.Printer, err = o.PrintFlags.ToPrinter()
if err != nil {
return err
}
o.Namespace, _, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
clientset, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
return err
}
o.Client = clientset.CoreV1().RESTClient()
if err != nil {
return err
}
return nil
}
func (o *AppJSONOptions) Validate() error {
if len(o.Filenames) != 1 {
return fmt.Errorf("you must provide the path to an app.json file or directory containing app.json")
}
switch o.Generator {
case AppJSONV1GeneratorName:
default:
return fmt.Errorf("the generator %q is not supported, use: %s", o.Generator, AppJSONV1GeneratorName)
}
return nil
}
func (o *AppJSONOptions) Run() error {
localPath, contents, err := contentsForPathOrURL(o.Filenames[0], o.In, "app.json")
if err != nil {
return err
}
g := &appjson.Generator{
LocalPath: localPath,
BaseImage: o.BaseImage,
}
switch {
case len(o.AsTemplate) > 0:
g.Name = o.AsTemplate
case len(localPath) > 0:
g.Name = filepath.Base(localPath)
default:
g.Name = path.Base(path.Dir(o.Filenames[0]))
}
if len(g.Name) == 0 {
g.Name = "app"
}
template, err := g.Generate(contents)
if err != nil {
return err
}
externalTemplate := &templatev1.Template{}
if err := templateapiv1.Convert_template_Template_To_v1_Template(template, externalTemplate, nil); err != nil {
return err
}
externalTemplate.ObjectLabels = map[string]string{"app.json": externalTemplate.Name}
// TODO: stop implying --dry-run behavior when an --output value is provided
if o.PrintFlags.OutputFormat != nil && len(*o.PrintFlags.OutputFormat) > 0 || len(o.AsTemplate) > 0 {
var obj runtime.Object
if len(o.AsTemplate) > 0 {
externalTemplate.Name = o.AsTemplate
obj = externalTemplate
} else {
obj = &corev1.List{Items: externalTemplate.Objects}
}
return o.Printer.PrintObj(obj, o.Out)
}
templateProcessor := templatev1client.NewTemplateProcessorClient(o.Client, o.Namespace)
result, err := appcmd.TransformTemplate(externalTemplate, templateProcessor, o.Namespace, nil, false)
if err != nil {
return err
}
// TODO(juanvallejo): remove once we have external version describers
describableResult := &templateapi.Template{}
if err := templateapiv1.Convert_v1_Template_To_template_Template(result, describableResult, nil); err != nil {
return err
}
appcmd.DescribeGeneratedTemplate(o.Out, "", describableResult, o.Namespace)
objs := &corev1.List{Items: result.Objects}
// actually create the objects
created, errs := o.createResources(objs)
// print what we have created first, then return a potential set of errors
if err := o.Printer.PrintObj(created, o.Out); err != nil {
errs = append(errs, err)
}
return kerrors.NewAggregate(errs)
}
func contentsForPathOrURL(s string, in io.Reader, subpaths ...string) (string, []byte, error) {
switch {
case s == "-":
contents, err := ioutil.ReadAll(in)
return "", contents, err
case strings.Index(s, "http://") == 0 || strings.Index(s, "https://") == 0:
_, err := url.Parse(s)
if err != nil {
return "", nil, fmt.Errorf("the URL passed to filename %q is not valid: %v", s, err)
}
res, err := http.Get(s)
if err != nil {
return "", nil, err
}
defer res.Body.Close()
contents, err := ioutil.ReadAll(res.Body)
return "", contents, err
default:
stat, err := os.Stat(s)
if err != nil {
return s, nil, err
}
if !stat.IsDir() {
contents, err := ioutil.ReadFile(s)
return s, contents, err
}
for _, sub := range subpaths {
path := filepath.Join(s, sub)
stat, err := os.Stat(path)
if err != nil {
continue
}
if stat.IsDir() {
continue
}
contents, err := ioutil.ReadFile(s)
return path, contents, err
}
return s, nil, os.ErrNotExist
}
}