// FollowAction continuously loops over an action and prints its completion status in os.Stderr.
// when the action reaches its expiration date, FollowAction prints its final status and returns.
func (cli Client) FollowAction(a mig.Action) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("followAction() -> %v", e)
}
}()
fmt.Fprintf(os.Stderr, "\x1b[34mFollowing action ID %.0f.\x1b[0m", a.ID)
sent := 0
dotter := 0
previousctr := 0
status := ""
attempts := 0
var completion float64
for {
a, _, err = cli.GetAction(a.ID)
if err != nil {
attempts++
time.Sleep(1 * time.Second)
if attempts >= 30 {
panic("failed to retrieve action after 30 seconds. launch may have failed")
}
continue
}
if status == "" {
status = a.Status
}
if status != a.Status {
fmt.Fprintf(os.Stderr, "\x1b[34mstatus=%s\x1b[0m", a.Status)
status = a.Status
}
// exit follower mode if status isn't one we follow,
// or enough commands have returned
// or expiration time has passed
if (status != "pending" && status != "scheduled" && status != "preparing" && status != "inflight") ||
(a.Counters.Done > 0 && a.Counters.Done >= a.Counters.Sent) ||
(time.Now().After(a.ExpireAfter.Add(10 * time.Second))) {
goto finish
break
}
// init counters
if sent == 0 {
if a.Counters.Sent == 0 {
time.Sleep(1 * time.Second)
continue
} else {
sent = a.Counters.Sent
}
}
if a.Counters.Done > 0 && a.Counters.Done > previousctr {
completion = (float64(a.Counters.Done) / float64(a.Counters.Sent)) * 100
if completion < 99.5 {
previousctr = a.Counters.Done
fmt.Fprintf(os.Stderr, "\x1b[34m%.0f%%\x1b[0m", completion)
}
}
fmt.Fprintf(os.Stderr, "\x1b[34m.\x1b[0m")
time.Sleep(2 * time.Second)
dotter++
}
finish:
a, _, err = cli.GetAction(a.ID)
if err != nil {
fmt.Fprintf(os.Stderr, "[error] failed to retrieve action counters\n")
} else {
completion = (float64(a.Counters.Done) / float64(a.Counters.Sent)) * 100
fmt.Fprintf(os.Stderr, "\n\x1b[34m- %2.1f%% done in %s\x1b[0m\n", completion, time.Now().Sub(a.StartTime).String())
}
fmt.Fprintf(os.Stderr, "\x1b[34m")
a.PrintCounters()
fmt.Fprintf(os.Stderr, "\x1b[0m")
return
}