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use std::io::{Read, Result, Write};
pub struct ReadStats<R> {
source: R,
reads: usize,
bytes: usize,
}
impl<R: Read> ReadStats<R> {
pub fn new(wrapped: R) -> ReadStats<R> {
ReadStats {
source: wrapped,
reads: 0,
bytes: 0,
}
}
pub fn get_ref(&self) -> &R {
&self.source
}
pub fn bytes_through(&self) -> usize {
self.bytes
}
pub fn reads(&self) -> usize {
self.reads
}
}
impl<R: Read> Read for ReadStats<R> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
let bytes = self.source.read(buf)?;
self.reads += 1;
self.bytes += bytes;
Ok(bytes)
}
}
pub struct WriteStats<W> {
sink: W,
writes: usize,
bytes: usize,
}
impl<W: Write> WriteStats<W> {
// _wrapped is ignored because W is not bounded on Debug or Display and therefore
// can't be passed through format!(). For actual implementation you will likely
// wish to remove the leading underscore so the variable is not ignored.
pub fn new(wrapped: W) -> WriteStats<W> {
WriteStats {
sink: wrapped,
writes: 0,
bytes: 0,
}
}
pub fn get_ref(&self) -> &W {
&self.sink
}
pub fn bytes_through(&self) -> usize {
self.bytes
}
pub fn writes(&self) -> usize {
self.writes
}
}
impl<W: Write> Write for WriteStats<W> {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
let bytes = self.sink.write(buf)?;
self.writes += 1;
self.bytes += bytes;
Ok(bytes)
}
fn flush(&mut self) -> Result<()> {
self.sink.flush()
}
}
|
