tailhook

quick_error! {
    #[derive(Debug)]
    pub enum Error {
        Io(err: io::Error, path: PathBuf) {
            display("could not read file {:?}: {}", path, err)
            context(path: &'a Path, err: io::Error)
                -> (err, path.to_path_buf())
        }
        // ...

tailhook

pub struct Context<X, E>(pub X, pub E);

impl<T, E> ResultExt<T, E> for Result<T, E> {
    fn context<X>(self, x: X) -> Result<T, Context<X, E>> {
        self.map_err(|e| Context(x, e))
    }
}

tailhook

pub trait ResultExt<T, E> {
    fn context<X>(self, x: X) -> Result<T, Context<X, E>>;
}

tailhook

enum Error {
    Io(io::Error),
    Parse(ParseIntError),
}
// ...
try!(File::open(fname)
    .and_then(|mut f| f.read_to_string(&mut buf))
    .map_err(|e| Error::Io(e, fname.to_path_buf())));
let x: u64 = try!(buf.parse()
    .map_err(|e| Error::Parse(e, fname.to_path_buf())));

tailhook

#[macro_use(quick_error)] extern crate quick_error;

use std::io::{self, stderr, Read, Write};
use std::fs::File;
use std::env;

use std::num::ParseIntError;
use std::path::{Path, PathBuf};

quick_error! {
    #[derive(Debug)]

tailhook

#[macro_use(quick_error)] extern crate quick_error;

use std::io::{self, stderr, Read, Write};
use std::fs::File;
use std::env;
use std::num::ParseIntError;
use std::path::{Path, PathBuf};

use quick_error::ResultExt;

tailhook

#[macro_use(quick_error)] extern crate quick_error;

use std::io::{self, stderr, Read, Write};
use std::fs::File;
use std::env;
use std::num::ParseIntError;
use std::path::{Path, PathBuf};

use quick_error::ResultExt;

tailhook

--- examples/serve.rs	2016-03-29 00:14:50.712643740 +0300
+++ examples/serve_sendfile.rs	2016-04-05 00:13:24.651021841 +0300
@@ -14,7 +14,8 @@
 
 enum Http {
     ReadHeaders,
-    SendResponse,
+    SendingFile { offset: u64 },
+    BodySent,
 }

tailhook

> ~/wrk -t 2 -c 20 -d 60 http://hostname:3000 --latency                                         
Running 1m test @ http://hostname:3000
  2 threads and 20 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   268.13us   84.07us   4.46ms   95.35%
    Req/Sec    37.74k     3.65k   68.62k    90.92%
  Latency Distribution
     50%  248.00us
     75%  291.00us
     90%  300.00us

tailhook

> ~/wrk -t 2 -c 20 -d 60 http://hostname:3000 --latency
Running 1m test @ http://hostname:3000
  2 threads and 20 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   451.75us   73.89us   2.42ms   78.56%
    Req/Sec    18.19k     1.54k   28.56k    83.44%
  Latency Distribution
     50%  441.00us
     75%  488.00us
     90%  545.00us