s3ueeze 0.1.0

Download and merge JSON files from S3
Documentation 
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use anyhow::{Result, bail};
use std::ops::{Add, AddAssign};

#[derive(Debug, Default)]
pub(crate) struct Metric<T> {
    pending: T,
    total: T,
}

impl<T: Copy + Add + AddAssign + Default> Metric<T> {
    /// Add a pending value to the `Metric`.
    pub fn add(&mut self, n: T) {
        self.pending += n;
    }

    /// Add all pending data to the total, reset the pending count, and return
    /// the value that was pending when flush was called.
    pub fn flush(&mut self) -> T {
        self.total += self.pending;
        let delta = self.pending;
        self.pending = T::default();

        delta
    }
}

impl<T: Copy + Add> Metric<T> {
    pub fn total(&self) -> Result<T>
    where
        <T as std::ops::Add>::Output: std::cmp::PartialEq<T>,
    {
        if self.total + self.pending != self.total {
            bail!("unflushed metrics");
        }

        Ok(self.total)
    }
}

impl Metric<u64> {
    pub fn increment(&mut self) {
        self.pending += 1;
    }
}