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rollout_resume.go
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/
rollout_resume.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"
"io"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/set"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
)
// ResumeConfig 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 ResumeConfig struct {
resource.FilenameOptions
Resumer func(object *resource.Info) ([]byte, error)
Mapper meta.RESTMapper
Typer runtime.ObjectTyper
Encoder runtime.Encoder
Infos []*resource.Info
Out io.Writer
}
var (
resume_long = templates.LongDesc(`
Resume a paused resource
Paused resources will not be reconciled by a controller. By resuming a
resource, we allow it to be reconciled again.
Currently only deployments support being resumed.`)
resume_example = templates.Examples(`
# Resume an already paused deployment
kubectl rollout resume deployment/nginx`)
)
func NewCmdRolloutResume(f cmdutil.Factory, out io.Writer) *cobra.Command {
options := &ResumeConfig{}
validArgs := []string{"deployment"}
argAliases := kubectl.ResourceAliases(validArgs)
cmd := &cobra.Command{
Use: "resume RESOURCE",
Short: i18n.T("Resume a paused resource"),
Long: resume_long,
Example: resume_example,
Run: func(cmd *cobra.Command, args []string) {
allErrs := []error{}
err := options.CompleteResume(f, cmd, out, args)
if err != nil {
allErrs = append(allErrs, err)
}
err = options.RunResume()
if err != nil {
allErrs = append(allErrs, err)
}
cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
},
ValidArgs: validArgs,
ArgAliases: argAliases,
}
usage := "identifying the resource to get from a server."
cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
return cmd
}
func (o *ResumeConfig) CompleteResume(f cmdutil.Factory, cmd *cobra.Command, out io.Writer, args []string) error {
if len(args) == 0 && cmdutil.IsFilenameSliceEmpty(o.Filenames) {
return cmdutil.UsageErrorf(cmd, "%s", cmd.Use)
}
o.Mapper, o.Typer = f.Object()
o.Encoder = f.JSONEncoder()
o.Resumer = f.Resumer
o.Out = out
cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
if err != nil {
return err
}
r := f.NewBuilder().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, &o.FilenameOptions).
ResourceTypeOrNameArgs(true, args...).
ContinueOnError().
Latest().
Flatten().
Do()
err = r.Err()
if err != nil {
return err
}
err = r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
o.Infos = append(o.Infos, info)
return nil
})
if err != nil {
return err
}
return nil
}
func (o ResumeConfig) RunResume() error {
allErrs := []error{}
for _, patch := range set.CalculatePatches(o.Infos, o.Encoder, o.Resumer) {
info := patch.Info
if patch.Err != nil {
allErrs = append(allErrs, fmt.Errorf("error: %s %q %v", info.Mapping.Resource, info.Name, patch.Err))
continue
}
if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {
cmdutil.PrintSuccess(o.Mapper, false, o.Out, info.Mapping.Resource, info.Name, false, "already resumed")
continue
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("failed to patch: %v", err))
continue
}
info.Refresh(obj, true)
cmdutil.PrintSuccess(o.Mapper, false, o.Out, info.Mapping.Resource, info.Name, false, "resumed")
}
return utilerrors.NewAggregate(allErrs)
}