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spinner.go
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spinner.go
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package cli
import (
"context"
"fmt"
"strings"
"time"
"github.com/briandowns/spinner"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/kubernetes"
)
var (
refreshFrequency = time.Second * 2
)
type watcher struct {
fsmApp string
podName string
spinner *spinner.Spinner
containerCnt int
readyContainerCnt int
restartCnt int
ready bool
}
func (w *watcher) refresh(clientSet kubernetes.Interface, fsmNamespace string) {
if w.ready {
return
}
fieldSelector := fields.OneTermEqualSelector("metadata.name", w.podName).String()
pods, err := clientSet.CoreV1().Pods(fsmNamespace).List(context.Background(), metav1.ListOptions{FieldSelector: fieldSelector})
if err != nil {
return
}
if len(pods.Items) == 0 {
w.ready = true
w.spinner.Stop()
return
}
pod := pods.Items[0]
phase := pod.Status.Phase
containers := pod.Status.ContainerStatuses
w.containerCnt = len(containers)
w.readyContainerCnt = 0
w.restartCnt = 0
for _, c := range containers {
if c.Ready {
w.readyContainerCnt++
}
w.restartCnt = w.restartCnt + int(c.RestartCount)
}
if w.containerCnt == w.readyContainerCnt || v1.PodSucceeded == phase {
w.ready = true
w.spinner.Stop()
} else {
w.spinner.Suffix = fmt.Sprintf("%s[%s] READY:%d/%d STATUS:%s RESTARTS:%d",
w.podName, fsmNamespace, w.readyContainerCnt, w.containerCnt, phase, w.restartCnt)
}
}
// Spinner indicator to fsm install
type Spinner struct {
fsmNamespace string
clientSet kubernetes.Interface
watchers map[string]*watcher
err error
quit chan bool
deployPrometheus bool
deployGrafana bool
deployJaeger bool
}
// Init instance of Spinner with the supplied options
func (s *Spinner) Init(clientSet kubernetes.Interface, fsmNamespace string, vals map[string]interface{}) {
s.clientSet = clientSet
s.fsmNamespace = fsmNamespace
s.quit = make(chan bool, 1)
s.watchers = make(map[string]*watcher)
if fsm, exists := vals["fsm"]; exists {
fsmVals := fsm.(map[string]interface{})
if v, has := fsmVals["deployPrometheus"]; has {
s.deployPrometheus = v.(bool)
}
if v, has := fsmVals["deployGrafana"]; has {
s.deployGrafana = v.(bool)
}
if v, has := fsmVals["deployJaeger"]; has {
s.deployJaeger = v.(bool)
}
}
}
func (s *Spinner) done() bool {
if len(s.watchers) >= 3 {
doneApps := map[string]bool{
"fsm-bootstrap": false,
"fsm-injector": false,
"fsm-controller": false,
}
if s.deployPrometheus {
doneApps["fsm-prometheus"] = false
}
if s.deployGrafana {
doneApps["fsm-grafana"] = false
}
if s.deployJaeger {
doneApps["fsm-jaeger"] = false
}
for _, w := range s.watchers {
if !w.ready {
return false
}
doneApps[w.fsmApp] = true
}
for _, done := range doneApps {
if !done {
return false
}
}
return true
}
return false
}
func (s *Spinner) refreshFsmApps() {
apps, err := s.clientSet.CoreV1().Pods(s.fsmNamespace).List(context.Background(), metav1.ListOptions{})
if err != nil {
s.err = err
s.quit <- true
return
}
if len(apps.Items) == 0 {
return
}
for _, app := range apps.Items {
_, exists := s.watchers[app.Name]
if !exists {
w := new(watcher)
w.podName = app.Name
w.fsmApp = app.Labels["app"]
if len(w.fsmApp) == 0 {
parts := strings.Split(w.podName, "-")
if len(parts) > 1 {
w.fsmApp = fmt.Sprintf("%s-%s", parts[0], parts[1])
}
}
w.spinner = spinner.New(spinner.CharSets[35], time.Millisecond*500)
_ = w.spinner.Color("bgBlue", "bold", "fgGreen")
if len(w.fsmApp) > 0 {
w.spinner.Suffix = fmt.Sprintf("%s[%s] is being deployed ...", w.fsmApp, w.podName)
w.spinner.FinalMSG = fmt.Sprintf("%s[%s] Done\n", w.fsmApp, w.podName)
} else {
w.spinner.Suffix = w.podName
w.spinner.FinalMSG = fmt.Sprintf("%s Done\n", w.podName)
}
w.spinner.Start()
s.watchers[app.Name] = w
}
}
for _, w := range s.watchers {
w.refresh(s.clientSet, s.fsmNamespace)
}
}
// Run starts spinner indicator
func (s *Spinner) Run(job func() error) error {
updateChan := make(chan interface{}, 1)
slidingTimer := time.NewTimer(refreshFrequency)
defer slidingTimer.Stop()
go func() {
if err := job(); err != nil {
s.err = err
s.quit <- true
}
}()
for {
select {
case <-s.quit:
return s.err
case <-updateChan:
slidingTimer.Reset(refreshFrequency)
case <-slidingTimer.C:
s.refreshFsmApps()
if !s.done() {
updateChan <- new(interface{})
} else {
s.quit <- true
}
}
}
}