/
rollout_restart.go
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/
rollout_restart.go
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/*
Copyright 2019 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/genericiooptions"
"k8s.io/cli-runtime/pkg/printers"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/kubectl/pkg/cmd/set"
cmdutil "k8s.io/kubectl/pkg/cmd/util"
"k8s.io/kubectl/pkg/polymorphichelpers"
"k8s.io/kubectl/pkg/scheme"
"k8s.io/kubectl/pkg/util/completion"
"k8s.io/kubectl/pkg/util/i18n"
"k8s.io/kubectl/pkg/util/templates"
)
// RestartOptions 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 RestartOptions struct {
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)
Resources []string
Builder func() *resource.Builder
Restarter polymorphichelpers.ObjectRestarterFunc
Namespace string
EnforceNamespace bool
LabelSelector string
resource.FilenameOptions
genericiooptions.IOStreams
fieldManager string
}
var (
restartLong = templates.LongDesc(i18n.T(`
Restart a resource.
Resource rollout will be restarted.`))
restartExample = templates.Examples(`
# Restart all deployments in test-namespace namespace
kubectl rollout restart deployment -n test-namespace
# Restart a deployment
kubectl rollout restart deployment/nginx
# Restart a daemon set
kubectl rollout restart daemonset/abc
# Restart deployments with the app=nginx label
kubectl rollout restart deployment --selector=app=nginx`)
)
// NewRolloutRestartOptions returns an initialized RestartOptions instance
func NewRolloutRestartOptions(streams genericiooptions.IOStreams) *RestartOptions {
return &RestartOptions{
PrintFlags: genericclioptions.NewPrintFlags("restarted").WithTypeSetter(scheme.Scheme),
IOStreams: streams,
}
}
// NewCmdRolloutRestart returns a Command instance for 'rollout restart' sub command
func NewCmdRolloutRestart(f cmdutil.Factory, streams genericiooptions.IOStreams) *cobra.Command {
o := NewRolloutRestartOptions(streams)
validArgs := []string{"deployment", "daemonset", "statefulset"}
cmd := &cobra.Command{
Use: "restart RESOURCE",
DisableFlagsInUseLine: true,
Short: i18n.T("Restart a resource"),
Long: restartLong,
Example: restartExample,
ValidArgsFunction: completion.SpecifiedResourceTypeAndNameCompletionFunc(f, validArgs),
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Validate())
cmdutil.CheckErr(o.RunRestart())
},
}
usage := "identifying the resource to get from a server."
cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)
cmdutil.AddFieldManagerFlagVar(cmd, &o.fieldManager, "kubectl-rollout")
cmdutil.AddLabelSelectorFlagVar(cmd, &o.LabelSelector)
o.PrintFlags.AddFlags(cmd)
return cmd
}
// Complete completes all the required options
func (o *RestartOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
o.Resources = args
o.Restarter = polymorphichelpers.ObjectRestarterFn
var err error
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = operation
return o.PrintFlags.ToPrinter()
}
o.Builder = f.NewBuilder
return nil
}
func (o *RestartOptions) Validate() error {
if len(o.Resources) == 0 && cmdutil.IsFilenameSliceEmpty(o.Filenames, o.Kustomize) {
return fmt.Errorf("required resource not specified")
}
return nil
}
// RunRestart performs the execution of 'rollout restart' sub command
func (o RestartOptions) RunRestart() error {
r := o.Builder().
WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.FilenameOptions).
LabelSelectorParam(o.LabelSelector).
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)
}
patches := set.CalculatePatches(infos, scheme.DefaultJSONEncoder(), set.PatchFn(o.Restarter))
if len(patches) == 0 && len(allErrs) == 0 {
fmt.Fprintf(o.ErrOut, "No resources found in %s namespace.\n", o.Namespace)
return nil
}
for _, patch := range patches {
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 {
allErrs = append(allErrs, fmt.Errorf("failed to create patch for %v: if restart has already been triggered within the past second, please wait before attempting to trigger another", info.Name))
continue
}
obj, err := resource.NewHelper(info.Client, info.Mapping).
WithFieldManager(o.fieldManager).
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("restarted")
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)
}