Function retry::retry_exponentially

pub fn retry_exponentially<F, G, R>(tries: u64,
                                    wait: f64,
                                    value_fn: F,
                                    condition_fn: G)
                                    -> Result<R, RetryError> where F: FnMut() -> R, G: FnMut(&R) -> bool

Invokes a function a certain number of times or until a condition is satisfied with an exponential backoff after each unsuccessful try.