feat: Implement rollout status command. Fixes #596

pkg/kubectl-argo-rollouts/cmd/cmd.go

@@ -13,6 +13,7 @@ import (
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/restart"
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/retry"
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/set"
+	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/status"
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/terminate"
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/undo"
 	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/cmd/version"
@@ -64,5 +65,6 @@ func NewCmdArgoRollouts(o *options.ArgoRolloutsOptions) *cobra.Command {
 	cmd.AddCommand(terminate.NewCmdTerminate(o))
 	cmd.AddCommand(set.NewCmdSet(o))
 	cmd.AddCommand(undo.NewCmdUndo(o))
+	cmd.AddCommand(status.NewCmdStatus(o))
 	return cmd
 }

pkg/kubectl-argo-rollouts/cmd/status/status.go

@@ -0,0 +1,122 @@
+package status
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/info"
+	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/options"
+	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/viewcontroller"
+	"github.com/spf13/cobra"
+)
+
+const (
+	statusLong = `Watch rollout until it finishes or the timeout is exceeded. Returns success if
+the rollout is healthy upon completion and an error otherwise.`
+	statusExample = `
+	# Watch the rollout until it succeeds
+	%[1]s status guestbook
+
+	# Watch the rollout until it succeeds, fail if it takes more than 60 seconds
+	%[1]s status --timeout 60 guestbook
+	`
+)
+
+type StatusOptions struct {
+	Watch   bool
+	Timeout int64
+
+	options.ArgoRolloutsOptions
+}
+
+// NewCmdStatus returns a new instance of a `rollouts status` command
+func NewCmdStatus(o *options.ArgoRolloutsOptions) *cobra.Command {
+	statusOptions := StatusOptions{
+		ArgoRolloutsOptions: *o,
+	}
+
+	var cmd = &cobra.Command{
+		Use:          "status ROLLOUT_NAME",
+		Short:        "Show the status of a rollout",
+		Long:         statusLong,
+		Example:      o.Example(statusExample),
+		SilenceUsage: true,
+		RunE: func(c *cobra.Command, args []string) error {
+			if len(args) != 1 {
+				return o.UsageErr(c)
+			}
+			name := args[0]
+			controller := viewcontroller.NewRolloutViewController(o.Namespace(), name, statusOptions.KubeClientset(), statusOptions.RolloutsClientset())
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			controller.Start(ctx)
+
+			ri, err := controller.GetRolloutInfo()
+			if err != nil {
+				return err
+			}
+
+			if !statusOptions.Watch {
+				fmt.Fprintln(o.Out, ri.Status)
+			} else {
+				rolloutUpdates := make(chan *info.RolloutInfo)
+				defer close(rolloutUpdates)
+				controller.RegisterCallback(func(roInfo *info.RolloutInfo) {
+					rolloutUpdates <- roInfo
+				})
+				go statusOptions.WatchStatus(ctx.Done(), cancel, statusOptions.Timeout, rolloutUpdates)
+				controller.Run(ctx)
+
+				finalRi, err := controller.GetRolloutInfo()
+				if err != nil {
+					return err
+				}
+
+				if finalRi.Status == "Degraded" {
+					return fmt.Errorf("The rollout is in a degraded state with message: %s", finalRi.Message)
+				} else if finalRi.Status != "Healthy" {
+					return fmt.Errorf("Rollout progress exceeded timeout")
+				}
+			}
+
+			return nil
+		},
+	}
+	cmd.Flags().BoolVarP(&statusOptions.Watch, "watch", "w", true, "Watch the status of the rollout until it's done")
+	cmd.Flags().Int64VarP(&statusOptions.Timeout, "timeout", "t", 0, "The length of time in seconds to watch before giving up, zero means wait forever")
+	return cmd
+}
+
+func (o *StatusOptions) WatchStatus(stopCh <-chan struct{}, cancelFunc context.CancelFunc, timeoutSeconds int64, rolloutUpdates chan *info.RolloutInfo) {
+	timeout := make(chan bool)
+	var roInfo *info.RolloutInfo
+	var preventFlicker time.Time
+
+	if timeoutSeconds != 0 {
+		go func() {
+			time.Sleep(time.Duration(timeoutSeconds) * time.Second)
+			timeout <- true
+		}()
+	}
+
+	for {
+		select {
+		case roInfo = <-rolloutUpdates:
+			if roInfo != nil && roInfo.Status == "Healthy" || roInfo.Status == "Degraded" {
+				fmt.Fprintln(o.Out, roInfo.Status)
+				cancelFunc()
+				return
+			}
+			if roInfo != nil && time.Now().After(preventFlicker.Add(200*time.Millisecond)) {
+				fmt.Fprintf(o.Out, "%s - %s\n", roInfo.Status, roInfo.Message)
+				preventFlicker = time.Now()
+			}
+		case <-stopCh:
+			return
+		case <-timeout:
+			cancelFunc()
+			return
+		}
+	}
+}

pkg/kubectl-argo-rollouts/cmd/status/status_test.go

@@ -0,0 +1,143 @@
+package status
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/info/testdata"
+	options "github.com/argoproj/argo-rollouts/pkg/kubectl-argo-rollouts/options/fake"
+	"github.com/stretchr/testify/assert"
+)
+
+const noWatch = "--watch=false"
+
+func TestStatusUsage(t *testing.T) {
+	tf, o := options.NewFakeArgoRolloutsOptions()
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{})
+	err := cmd.Execute()
+
+	assert.Error(t, err)
+}
+
+func TestStatusRolloutNotFound(t *testing.T) {
+	tf, o := options.NewFakeArgoRolloutsOptions()
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{"does-not-exist", noWatch})
+	err := cmd.Execute()
+
+	assert.Error(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Empty(t, stdout)
+	assert.Equal(t, "Error: rollout.argoproj.io \"does-not-exist\" not found\n", stderr)
+}
+
+func TestWatchStatusRolloutNotFound(t *testing.T) {
+	tf, o := options.NewFakeArgoRolloutsOptions()
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{"does-not-exist"})
+	err := cmd.Execute()
+
+	assert.Error(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Empty(t, stdout)
+	assert.Equal(t, "Error: rollout.argoproj.io \"does-not-exist\" not found\n", stderr)
+}
+
+func TestStatusBlueGreenRollout(t *testing.T) {
+	rolloutObjs := testdata.NewBlueGreenRollout()
+
+	tf, o := options.NewFakeArgoRolloutsOptions(rolloutObjs.AllObjects()...)
+	o.RESTClientGetter = tf.WithNamespace(rolloutObjs.Rollouts[0].Namespace)
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{rolloutObjs.Rollouts[0].Name, noWatch})
+	err := cmd.Execute()
+
+	assert.NoError(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Equal(t, "Paused\n", stdout)
+	assert.Empty(t, stderr)
+}
+
+func TestStatusInvalidRollout(t *testing.T) {
+	rolloutObjs := testdata.NewInvalidRollout()
+
+	tf, o := options.NewFakeArgoRolloutsOptions(rolloutObjs.AllObjects()...)
+	o.RESTClientGetter = tf.WithNamespace(rolloutObjs.Rollouts[0].Namespace)
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{rolloutObjs.Rollouts[0].Name, noWatch})
+	err := cmd.Execute()
+
+	assert.NoError(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Equal(t, "Degraded\n", stdout)
+	assert.Empty(t, stderr)
+}
+
+func TestStatusAbortedRollout(t *testing.T) {
+	rolloutObjs := testdata.NewAbortedRollout()
+
+	tf, o := options.NewFakeArgoRolloutsOptions(rolloutObjs.AllObjects()...)
+	o.RESTClientGetter = tf.WithNamespace(rolloutObjs.Rollouts[0].Namespace)
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{rolloutObjs.Rollouts[0].Name, noWatch})
+	err := cmd.Execute()
+
+	assert.NoError(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Equal(t, "Degraded\n", stdout)
+	assert.Empty(t, stderr)
+}
+
+func TestWatchAbortedRollout(t *testing.T) {
+	rolloutObjs := testdata.NewAbortedRollout()
+
+	tf, o := options.NewFakeArgoRolloutsOptions(rolloutObjs.AllObjects()...)
+	o.RESTClientGetter = tf.WithNamespace(rolloutObjs.Rollouts[0].Namespace)
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{rolloutObjs.Rollouts[0].Name})
+	err := cmd.Execute()
+
+	assert.Error(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Equal(t, "Degraded\n", stdout)
+	assert.Equal(t, "Error: The rollout is in a degraded state with message: RolloutAborted: metric \"web\" assessed Failed due to failed (1) > failureLimit (0)\n", stderr)
+}
+
+func TestWatchTimeoutRollout(t *testing.T) {
+	rolloutObjs := testdata.NewBlueGreenRollout()
+
+	tf, o := options.NewFakeArgoRolloutsOptions(rolloutObjs.AllObjects()...)
+	o.RESTClientGetter = tf.WithNamespace(rolloutObjs.Rollouts[0].Namespace)
+	defer tf.Cleanup()
+	cmd := NewCmdStatus(o)
+	cmd.PersistentPreRunE = o.PersistentPreRunE
+	cmd.SetArgs([]string{rolloutObjs.Rollouts[0].Name, "--timeout=1"})
+	err := cmd.Execute()
+
+	assert.Error(t, err)
+	stdout := o.Out.(*bytes.Buffer).String()
+	stderr := o.ErrOut.(*bytes.Buffer).String()
+	assert.Equal(t, "Paused - BlueGreenPause\n", stdout)
+	assert.Equal(t, "Error: Rollout progress exceeded timeout\n", stderr)
+}