// FileChecker checks the existence of a file and returns and error
// if the file exists, taking the application out of rotation
func FileChecker(f string) health.Checker {
return health.CheckFunc(func() error {
if _, err := os.Stat(f); err == nil {
return errors.New("file exists")
}
return nil
})
}
// HTTPChecker does a HEAD request and verifies if the HTTP status
// code return is a 200, taking the application out of rotation if
// otherwise
func HTTPChecker(r string) health.Checker {
return health.CheckFunc(func() error {
response, err := http.Head(r)
if err != nil {
return errors.New("error while checking: " + r)
}
if response.StatusCode != http.StatusOK {
return errors.New("downstream service returned unexpected status: " + string(response.StatusCode))
}
return nil
})
}