// ensureAppIsStarted make sure that the app and all units present in the given
// message are started.
func ensureAppIsStarted(msg *queue.Message) (App, error) {
app, err := GetByName(msg.Args[0])
if err != nil {
return App{}, fmt.Errorf("Error handling %q: app %q does not exist.", msg.Action, msg.Args[0])
}
units := getUnits(app, msg.Args[1:])
if len(msg.Args) > 1 && len(units) == 0 {
format := "Error handling %q for the app %q: unknown units in the message. Deleting it..."
return *app, fmt.Errorf(format, msg.Action, app.Name)
}
if !app.Available() || !units.Started() {
format := "Error handling %q for the app %q:"
uState := units.State()
if uState == "error" || uState == "down" {
format += fmt.Sprintf(" units are in %q state.", uState)
} else {
msg.Fail()
format += " all units must be started."
}
return *app, fmt.Errorf(format, msg.Action, app.Name)
}
return *app, nil
}
