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list_rollouts.go
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/
list_rollouts.go
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package list
import (
"context"
"fmt"
"text/tabwriter"
"time"
"github.com/spf13/cobra"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/argoproj/argo-rollouts/pkg/apis/rollouts/v1alpha1"
argoprojv1alpha1 "github.com/argoproj/argo-rollouts/pkg/client/clientset/versioned/typed/rollouts/v1alpha1"
"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/options"
)
const (
listRolloutsExample = `
# List rollouts
%[1]s list rollouts
# List rollouts from all namespaces
%[1]s list rollouts --all-namespaces
# List rollouts and watch for changes
%[1]s list rollouts --watch`
listRolloutsUsage = `This command lists all of the rollouts for a specified namespace (uses current namespace context if namespace not specified).`
)
// NewCmdListRollouts returns a new instance of an `rollouts list rollouts` command
func NewCmdListRollouts(o *options.ArgoRolloutsOptions) *cobra.Command {
listOptions := ListOptions{
ArgoRolloutsOptions: *o,
}
var cmd = &cobra.Command{
Use: "rollouts",
Short: "List rollouts",
Long: listRolloutsUsage,
Aliases: []string{"ro", "rollout"},
Example: o.Example(listRolloutsExample),
SilenceUsage: true,
RunE: func(c *cobra.Command, args []string) error {
ctx := c.Context()
var namespace string
if listOptions.allNamespaces {
namespace = metav1.NamespaceAll
} else {
namespace = o.Namespace()
}
rolloutIf := o.RolloutsClientset().ArgoprojV1alpha1().Rollouts(namespace)
opts := listOptions.ListOptions()
rolloutList, err := rolloutIf.List(ctx, opts)
if err != nil {
return err
}
err = listOptions.PrintRolloutTable(rolloutList)
if err != nil {
return err
}
if listOptions.watch {
ctx := context.Background()
err = listOptions.PrintRolloutUpdates(ctx, rolloutIf, rolloutList)
if err != nil {
return err
}
}
return nil
},
}
cmd.Flags().StringVar(&listOptions.name, "name", "", "Only show rollout with specified name")
cmd.Flags().BoolVarP(&listOptions.allNamespaces, "all-namespaces", "A", false, "Include all namespaces")
cmd.Flags().BoolVarP(&listOptions.watch, "watch", "w", false, "Watch for changes")
cmd.Flags().BoolVar(&listOptions.timestamps, "timestamps", false, "Print timestamps on updates")
return cmd
}
// PrintRolloutTable prints rollouts in table format
func (o *ListOptions) PrintRolloutTable(roList *v1alpha1.RolloutList) error {
if len(roList.Items) == 0 && !o.watch {
fmt.Fprintln(o.ErrOut, "No resources found.")
return nil
}
w := tabwriter.NewWriter(o.Out, 0, 0, 2, ' ', 0)
headerStr := headerFmtString
if o.allNamespaces {
headerStr = "NAMESPACE\t" + headerStr
}
if o.timestamps {
headerStr = "TIMESTAMP\t" + headerStr
}
fmt.Fprintf(w, headerStr)
for _, ro := range roList.Items {
roLine := newRolloutInfo(ro)
fmt.Fprintln(w, roLine.String(o.timestamps, o.allNamespaces))
}
_ = w.Flush()
return nil
}
// PrintRolloutUpdates watches for changes to rollouts and prints the updates
func (o *ListOptions) PrintRolloutUpdates(ctx context.Context, rolloutIf argoprojv1alpha1.RolloutInterface, roList *v1alpha1.RolloutList) error {
w := tabwriter.NewWriter(o.Out, 0, 0, 2, ' ', 0)
opts := o.ListOptions()
opts.ResourceVersion = roList.ListMeta.ResourceVersion
watchIf, err := rolloutIf.Watch(ctx, opts)
if err != nil {
return err
}
// ticker is used to flush the tabwriter every few moments so that table is aligned when there
// are a flood of results in the watch channel
ticker := time.NewTicker(500 * time.Millisecond)
// prevLines remembers the most recent rollout lines we printed, so that we only print new lines
// when they have have changed in a meaningful way
prevLines := make(map[infoKey]rolloutInfo)
for _, ro := range roList.Items {
roLine := newRolloutInfo(ro)
prevLines[roLine.key()] = roLine
}
var ro *v1alpha1.Rollout
retries := 0
L:
for {
select {
case next := <-watchIf.ResultChan():
ro, _ = next.Object.(*v1alpha1.Rollout)
case <-ticker.C:
_ = w.Flush()
continue
case <-ctx.Done():
break L
}
if ro == nil {
// if we get here, it means an error on the watch. try to re-establish the watch
watchIf.Stop()
newWatchIf, err := rolloutIf.Watch(ctx, opts)
if err != nil {
if retries > 5 {
return err
}
o.Log.Warn(err)
// this sleep prevents a hot-loop in the event there is a persistent error
time.Sleep(time.Second)
retries++
} else {
watchIf = newWatchIf
retries = 0
}
continue
}
opts.ResourceVersion = ro.ObjectMeta.ResourceVersion
roLine := newRolloutInfo(*ro)
if prevLine, ok := prevLines[roLine.key()]; !ok || prevLine != roLine {
fmt.Fprintln(w, roLine.String(o.timestamps, o.allNamespaces))
prevLines[roLine.key()] = roLine
}
}
watchIf.Stop()
return nil
}