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rollout_pause.go
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rollout_pause.go
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/*
Copyright 2016 The Kubernetes 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 rollout
import (
"fmt"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/cli-runtime/pkg/genericclioptions/printers"
"k8s.io/cli-runtime/pkg/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl/cmd/set"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/polymorphichelpers"
"k8s.io/kubernetes/pkg/kubectl/scheme"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
"k8s.io/kubernetes/pkg/kubectl/util/templates"
)
// PauseOptions is the start of the data required to perform the operation. As new fields are added, add them here instead of
// referencing the cmd.Flags()
type PauseOptions struct {
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)
Pauser polymorphichelpers.ObjectPauserFunc
Builder func() *resource.Builder
Namespace string
EnforceNamespace bool
Resources []string
resource.FilenameOptions
genericclioptions.IOStreams
}
var (
pauseLong = templates.LongDesc(`
Mark the provided resource as paused
Paused resources will not be reconciled by a controller.
Use "kubectl rollout resume" to resume a paused resource.
Currently only deployments support being paused.`)
pauseExample = templates.Examples(`
# Mark the nginx deployment as paused. Any current state of
# the deployment will continue its function, new updates to the deployment will not
# have an effect as long as the deployment is paused.
kubectl rollout pause deployment/nginx`)
)
// NewCmdRolloutPause returns a Command instance for 'rollout pause' sub command
func NewCmdRolloutPause(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := &PauseOptions{
PrintFlags: genericclioptions.NewPrintFlags("paused").WithTypeSetter(scheme.Scheme),
IOStreams: streams,
}
validArgs := []string{"deployment"}
cmd := &cobra.Command{
Use: "pause RESOURCE",
DisableFlagsInUseLine: true,
Short: i18n.T("Mark the provided resource as paused"),
Long: pauseLong,
Example: pauseExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Validate())
cmdutil.CheckErr(o.RunPause())
},
ValidArgs: validArgs,
}
o.PrintFlags.AddFlags(cmd)
usage := "identifying the resource to get from a server."
cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)
return cmd
}
// Complete completes all the required options
func (o *PauseOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
o.Pauser = polymorphichelpers.ObjectPauserFn
var err error
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
o.Resources = args
o.Builder = f.NewBuilder
o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = operation
return o.PrintFlags.ToPrinter()
}
return nil
}
func (o *PauseOptions) Validate() error {
if len(o.Resources) == 0 && cmdutil.IsFilenameSliceEmpty(o.Filenames) {
return fmt.Errorf("required resource not specified")
}
return nil
}
// RunPause performs the execution of 'rollout pause' sub command
func (o *PauseOptions) RunPause() error {
r := o.Builder().
WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.FilenameOptions).
ResourceTypeOrNameArgs(true, o.Resources...).
ContinueOnError().
Latest().
Flatten().
Do()
if err := r.Err(); err != nil {
return err
}
allErrs := []error{}
infos, err := r.Infos()
if err != nil {
// restore previous command behavior where
// an error caused by retrieving infos due to
// at least a single broken object did not result
// in an immediate return, but rather an overall
// aggregation of errors.
allErrs = append(allErrs, err)
}
for _, patch := range set.CalculatePatches(infos, scheme.DefaultJSONEncoder(), set.PatchFn(o.Pauser)) {
info := patch.Info
if patch.Err != nil {
resourceString := info.Mapping.Resource.Resource
if len(info.Mapping.Resource.Group) > 0 {
resourceString = resourceString + "." + info.Mapping.Resource.Group
}
allErrs = append(allErrs, fmt.Errorf("error: %s %q %v", resourceString, info.Name, patch.Err))
continue
}
if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {
printer, err := o.ToPrinter("already paused")
if err != nil {
allErrs = append(allErrs, err)
continue
}
if err = printer.PrintObj(info.Object, o.Out); err != nil {
allErrs = append(allErrs, err)
}
continue
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch, nil)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("failed to patch: %v", err))
continue
}
info.Refresh(obj, true)
printer, err := o.ToPrinter("paused")
if err != nil {
allErrs = append(allErrs, err)
continue
}
if err = printer.PrintObj(info.Object, o.Out); err != nil {
allErrs = append(allErrs, err)
}
}
return utilerrors.NewAggregate(allErrs)
}