rust_filen 0.3.0

Rust interface for Filen.io API
Documentation 
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#![doc(hidden)]

use crate::retry_settings::RetrySettings;
use std::time::Duration;

/// Each retry increases the delay since the last exponentially, but a maximum delay is limited.
#[derive(Clone, Debug, PartialEq)]
pub struct LimitedExponential {
    current: u64,
    factor: f64,
    max: u64,
}

impl LimitedExponential {
    /// Creates a new `LimitedExponential` from the corresponding `RetrySettings` params.
    pub const fn from_retry_settings(settings: &RetrySettings) -> Self {
        Self {
            current: settings.initial_delay().as_millis() as u64,
            factor: settings.exp_factor() as f64,
            max: settings.max_delay().as_millis() as u64,
        }
    }
}

impl Iterator for LimitedExponential {
    type Item = Duration;

    fn next(&mut self) -> Option<Duration> {
        let duration = Duration::from_millis(self.current);

        let next = (self.current as f64) * self.factor;
        self.current = if next > (self.max as f64) {
            self.max
        } else {
            next as u64
        };

        Some(duration)
    }
}