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Display an external version of the object for --output

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Use the version of the API the RESTMapper prefers (currently)
This commit is contained in:
Clayton Coleman 2014-11-01 18:44:03 -04:00
parent 179213f61c
commit a8ccb0f99f
4 changed files with 55 additions and 37 deletions
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2
pkg/kubectl/cmd/cmd.go
View File

@ -84,7 +84,7 @@ Find more information at https://github.com/GoogleCloudPlatform/kubernetes.`,
cmds.PersistentFlags().StringP("server", "s", "", "Kubernetes apiserver to connect to")
cmds.PersistentFlags().StringP("auth-path", "a", os.Getenv("HOME")+"/.kubernetes_auth", "Path to the auth info file. If missing, prompt the user. Only used if using https.")
cmds.PersistentFlags().Bool("match-server-version", false, "Require server version to match client version")
cmds.PersistentFlags().String("api-version", latest.Version, "The version of the API to use against the server (used for viewing resources only)")
cmds.PersistentFlags().String("api-version", latest.Version, "The version of the API to use against the server")
cmds.PersistentFlags().String("certificate-authority", "", "Path to a certificate file for the certificate authority")
cmds.PersistentFlags().String("client-certificate", "", "Path to a client certificate for TLS.")
cmds.PersistentFlags().String("client-key", "", "Path to a client key file for TLS.")

23
pkg/kubectl/cmd/get.go
View File

@ -17,6 +17,7 @@ limitations under the License.
package cmd
import (
"fmt"
"io"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl"
@ -33,7 +34,8 @@ func (f *Factory) NewCmdGet(out io.Writer) *cobra.Command {
Possible resources include pods (po), replication controllers (rc), services
(se) or minions (mi).
If you specify a Go template, you can use any field defined in pkg/api/types.go.
If you specify a Go template, you can use any fields defined for the API version
you are connecting to the server with.
Examples:
$ kubectl get pods
@ -54,16 +56,27 @@ Examples:
client, err := f.Client(cmd, mapping)
checkErr(err)
obj, err := kubectl.NewRESTHelper(client, mapping).Get(namespace, name, labels)
checkErr(err)
outputFormat := getFlagString(cmd, "output")
templateFile := getFlagString(cmd, "template")
defaultPrinter, err := f.Printer(cmd, mapping, getFlagBool(cmd, "no-headers"))
checkErr(err)
err = kubectl.Print(out, obj, outputFormat, templateFile, defaultPrinter)
printer, versioned, err := kubectl.GetPrinter(outputFormat, templateFile, defaultPrinter)
checkErr(err)
obj, err := kubectl.NewRESTHelper(client, mapping).Get(namespace, name, labels)
checkErr(err)
if versioned {
// TODO Add an --output-version lock which can ensure that regardless of the
// server version, the client output stays the same.
obj, err = mapping.ObjectConvertor.ConvertToVersion(obj, mapping.APIVersion)
checkErr(err)
}
if err := printer.PrintObj(obj, out); err != nil {
checkErr(fmt.Errorf("Unable to output the provided object: %v", err))
}
},
}
cmd.Flags().StringP("output", "o", "", "Output format: json|yaml|template|templatefile")

37
pkg/kubectl/resource_printer.go
View File

@ -34,20 +34,10 @@ import (
"gopkg.in/v1/yaml"
)
// Print outputs a runtime.Object to an io.Writer in the given format
func Print(w io.Writer, obj runtime.Object, format string, templateFile string, defaultPrinter ResourcePrinter) error {
printer, err := getPrinter(format, templateFile, defaultPrinter)
if err != nil {
return err
}
if err := printer.PrintObj(obj, w); err != nil {
return fmt.Errorf("Failed to print: %v\nRaw received object:\n%#v", err, obj)
}
return nil
}
func getPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (ResourcePrinter, error) {
// GetPrinter returns a resource printer and a bool indicating whether the object must be
// versioned for the given format.
func GetPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (ResourcePrinter, bool, error) {
versioned := true
var printer ResourcePrinter
switch format {
case "json":
@ -57,11 +47,11 @@ func getPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (Re
case "template":
var data []byte
if len(templateFile) == 0 {
return printer, fmt.Errorf("template format specified but no template given")
return nil, false, fmt.Errorf("template format specified but no template given")
}
tmpl, err := template.New("output").Parse(templateFile)
if err != nil {
return printer, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
return nil, false, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
}
printer = &TemplatePrinter{
Template: tmpl,
@ -72,27 +62,30 @@ func getPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (Re
var err error
data, err = ioutil.ReadFile(templateFile)
if err != nil {
return printer, fmt.Errorf("Error reading template %s, %v\n", templateFile, err)
return nil, false, fmt.Errorf("Error reading template %s, %v\n", templateFile, err)
}
} else {
return printer, fmt.Errorf("templatefile format specified but no template file given")
return nil, false, fmt.Errorf("templatefile format specified but no template file given")
}
tmpl, err := template.New("output").Parse(string(data))
if err != nil {
return printer, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
return nil, false, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
}
printer = &TemplatePrinter{
Template: tmpl,
}
default:
case "":
printer = defaultPrinter
versioned = false
default:
return nil, false, fmt.Errorf("output format %q not recognized", format)
}
return printer, nil
return printer, versioned, nil
}
// ResourcePrinter is an interface that knows how to print API resources.
type ResourcePrinter interface {
// Print receives an arbitrary JSON body, formats it and prints it to a writer.
// Print receives an arbitrary object, formats it and prints it to a writer.
PrintObj(runtime.Object, io.Writer) error
}

30
pkg/kubectl/resource_printer_test.go
View File

@ -54,9 +54,14 @@ func TestJSONPrinter(t *testing.T) {
func TestPrintJSON(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "json", "", nil); err != nil {
printer, versioned, err := GetPrinter("json", "", nil)
if err != nil {
t.Errorf("unexpected error: %#v", err)
}
if !versioned {
t.Errorf("printer should be versioned")
}
printer.PrintObj(&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, buf)
obj := map[string]interface{}{}
if err := json.Unmarshal(buf.Bytes(), &obj); err != nil {
t.Errorf("unexpected error: %#v\n%s", err, buf.String())
@ -65,9 +70,14 @@ func TestPrintJSON(t *testing.T) {
func TestPrintYAML(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "yaml", "", nil); err != nil {
printer, versioned, err := GetPrinter("yaml", "", nil)
if err != nil {
t.Errorf("unexpected error: %#v", err)
}
if !versioned {
t.Errorf("printer should be versioned")
}
printer.PrintObj(&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, buf)
obj := map[string]interface{}{}
if err := yaml.Unmarshal(buf.Bytes(), &obj); err != nil {
t.Errorf("unexpected error: %#v\n%s", err, buf.String())
@ -76,31 +86,33 @@ func TestPrintYAML(t *testing.T) {
func TestPrintTemplate(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "template", "{{ .Name }}", nil); err != nil {
printer, versioned, err := GetPrinter("template", "{{ .Name }}", nil)
if err != nil {
t.Errorf("unexpected error: %#v", err)
}
if !versioned {
t.Errorf("printer should be versioned")
}
printer.PrintObj(&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, buf)
if buf.String() != "foo" {
t.Errorf("unexpected output: %s", buf.String())
}
}
func TestPrintEmptyTemplate(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "template", "", nil); err == nil {
if _, _, err := GetPrinter("template", "", nil); err == nil {
t.Errorf("unexpected non-error")
}
}
func TestPrintBadTemplate(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "template", "{{ .Name", nil); err == nil {
if _, _, err := GetPrinter("template", "{{ .Name", nil); err == nil {
t.Errorf("unexpected non-error")
}
}
func TestPrintBadTemplateFile(t *testing.T) {
buf := bytes.NewBuffer([]byte{})
if err := Print(buf, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}, "templatefile", "", nil); err == nil {
if _, _, err := GetPrinter("templatefile", "", nil); err == nil {
t.Errorf("unexpected non-error")
}
}