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use std::io::{Read, Result};
use std::time::{Duration, Instant};
pub struct Progress<R> {
bytes: usize,
tick: Instant,
stream: R,
}
impl<R> Progress<R> {
pub fn new(stream: R) -> Self {
Progress {
bytes: 0,
tick: Instant::now() + Duration::from_millis(2000),
stream,
}
}
}
impl<R: Read> Read for Progress<R> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
let num = self.stream.read(buf)?;
self.bytes += num;
let now = Instant::now();
if now > self.tick {
self.tick = now + Duration::from_millis(500);
errorf!("downloading... {} bytes\n", self.bytes);
}
Ok(num)
}
}
impl<R> Drop for Progress<R> {
fn drop(&mut self) {
errorf!("done ({} bytes)\n", self.bytes);
}
}
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