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feat(server): dropping a Response will write out to the underlying st…
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…ream
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@seanmonstar
seanmonstar committed May 6, 2015
1 parent 7f5e038 commit 5176922
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Showing 3 changed files with 193 additions and 45 deletions.
4 changes: 0 additions & 4 deletions examples/server.rs
View file
Expand Up @@ -27,25 +27,21 @@ fn echo(mut req: Request, mut res: Response) {
res.headers_mut().set(ContentLength(out.len() as u64));
let mut res = try_return!(res.start());
try_return!(res.write_all(out));
try_return!(res.end());
return;
},
(&Post, "/echo") => (), // fall through, fighting mutable borrows
_ => {
*res.status_mut() = hyper::NotFound;
try_return!(res.start().and_then(|res| res.end()));
return;
}
},
_ => {
try_return!(res.start().and_then(|res| res.end()));
return;
}
};

let mut res = try_return!(res.start());
try_return!(copy(&mut req, &mut res));
try_return!(res.end());
}

fn main() {
Expand Down
2 changes: 0 additions & 2 deletions src/server/mod.rs
View file
Expand Up @@ -15,8 +15,6 @@
//! (hyper::Get, _) => StatusCode::NotFound,
//! _ => StatusCode::MethodNotAllowed
//! };
//!
//! res.start().unwrap().end().unwrap();
//! }).listen("0.0.0.0:8080").unwrap();
use std::fmt;
use std::io::{ErrorKind, BufWriter, Write};
Expand Down
232 changes: 193 additions & 39 deletions src/server/response.rs
View file
Expand Up @@ -2,8 +2,11 @@
//!
//! These are responses sent by a `hyper::Server` to clients, after
//! receiving a request.
use std::any::Any;
use std::marker::PhantomData;
use std::mem;
use std::io::{self, Write};
use std::ptr;

use time::now_utc;

Expand All @@ -14,9 +17,10 @@ use status;
use net::{Fresh, Streaming};
use version;


/// The outgoing half for a Tcp connection, created by a `Server` and given to a `Handler`.
#[derive(Debug)]
pub struct Response<'a, W = Fresh> {
pub struct Response<'a, W: Any = Fresh> {
/// The HTTP version of this response.
pub version: version::HttpVersion,
// Stream the Response is writing to, not accessible through UnwrittenResponse
Expand All @@ -26,10 +30,10 @@ pub struct Response<'a, W = Fresh> {
// The outgoing headers on this response.
headers: header::Headers,

_marker: PhantomData<W>
_writing: PhantomData<W>
}

impl<'a, W> Response<'a, W> {
impl<'a, W: Any> Response<'a, W> {
/// The status of this response.
#[inline]
pub fn status(&self) -> status::StatusCode { self.status }
Expand All @@ -47,31 +51,26 @@ impl<'a, W> Response<'a, W> {
version: version,
body: body,
headers: headers,
_marker: PhantomData,
_writing: PhantomData,
}
}

/// Deconstruct this Response into its constituent parts.
pub fn deconstruct(self) -> (version::HttpVersion, HttpWriter<&'a mut (Write + 'a)>,
status::StatusCode, header::Headers) {
(self.version, self.body, self.status, self.headers)
}
}

impl<'a> Response<'a, Fresh> {
/// Creates a new Response that can be used to write to a network stream.
pub fn new(stream: &'a mut (Write + 'a)) -> Response<'a, Fresh> {
Response {
status: status::StatusCode::Ok,
version: version::HttpVersion::Http11,
headers: header::Headers::new(),
body: ThroughWriter(stream),
_marker: PhantomData,
unsafe {
let parts = (
self.version,
ptr::read(&self.body),
self.status,
ptr::read(&self.headers)
);
mem::forget(self);
parts
}
}

/// Consume this Response<Fresh>, writing the Headers and Status and creating a Response<Streaming>
pub fn start(mut self) -> io::Result<Response<'a, Streaming>> {
fn write_head(&mut self) -> io::Result<Body> {
debug!("writing head: {:?} {:?}", self.version, self.status);
try!(write!(&mut self.body, "{} {}{}{}", self.version, self.status, CR as char, LF as char));

Expand All @@ -80,19 +79,14 @@ impl<'a> Response<'a, Fresh> {
}


let mut chunked = true;
let mut len = 0;
let mut body_type = Body::Chunked;

match self.headers.get::<header::ContentLength>() {
Some(cl) => {
chunked = false;
len = **cl;
},
None => ()
if let Some(cl) = self.headers.get::<header::ContentLength>() {
body_type = Body::Sized(**cl);
};

// can't do in match above, thanks borrowck
if chunked {
if body_type == Body::Chunked {
let encodings = match self.headers.get_mut::<header::TransferEncoding>() {
Some(&mut header::TransferEncoding(ref mut encodings)) => {
//TODO: check if chunked is already in encodings. use HashSet?
Expand All @@ -113,46 +107,206 @@ impl<'a> Response<'a, Fresh> {
try!(write!(&mut self.body, "{}", self.headers));
try!(write!(&mut self.body, "{}", LINE_ENDING));

let stream = if chunked {
ChunkedWriter(self.body.into_inner())
} else {
SizedWriter(self.body.into_inner(), len)
Ok(body_type)
}


}

impl<'a> Response<'a, Fresh> {
/// Creates a new Response that can be used to write to a network stream.
#[inline]
pub fn new(stream: &'a mut (Write + 'a)) -> Response<'a, Fresh> {
Response {
status: status::StatusCode::Ok,
version: version::HttpVersion::Http11,
headers: header::Headers::new(),
body: ThroughWriter(stream),
_writing: PhantomData,
}
}

/// Consume this Response<Fresh>, writing the Headers and Status and creating a Response<Streaming>
pub fn start(mut self) -> io::Result<Response<'a, Streaming>> {
let body_type = try!(self.write_head());
let (version, body, status, headers) = self.deconstruct();
let stream = match body_type {
Body::Chunked => ChunkedWriter(body.into_inner()),
Body::Sized(len) => SizedWriter(body.into_inner(), len)
};

// "copy" to change the phantom type
Ok(Response {
version: self.version,
version: version,
body: stream,
status: self.status,
headers: self.headers,
_marker: PhantomData,
status: status,
headers: headers,
_writing: PhantomData,
})
}

/// Get a mutable reference to the status.
#[inline]
pub fn status_mut(&mut self) -> &mut status::StatusCode { &mut self.status }

/// Get a mutable reference to the Headers.
#[inline]
pub fn headers_mut(&mut self) -> &mut header::Headers { &mut self.headers }
}


impl<'a> Response<'a, Streaming> {
/// Flushes all writing of a response to the client.
#[inline]
pub fn end(self) -> io::Result<()> {
debug!("ending");
try!(self.body.end());
trace!("ending");
let (_, body, _, _) = self.deconstruct();
try!(body.end());
Ok(())
}
}

impl<'a> Write for Response<'a, Streaming> {
#[inline]
fn write(&mut self, msg: &[u8]) -> io::Result<usize> {
debug!("write {:?} bytes", msg.len());
self.body.write(msg)
}

#[inline]
fn flush(&mut self) -> io::Result<()> {
self.body.flush()
}
}

#[derive(PartialEq)]
enum Body {
Chunked,
Sized(u64),
}

type StatusFresh = PhantomData<Fresh>;

impl<'a, T: Any> Drop for Response<'a, T> {
fn drop(&mut self) {
if (&self._writing as &Any).is::<StatusFresh>() {
let mut body = match self.write_head() {
Ok(Body::Chunked) => ChunkedWriter(self.body.get_mut()),
Ok(Body::Sized(len)) => SizedWriter(self.body.get_mut(), len),
Err(e) => {
debug!("error dropping request: {:?}", e);
return;
}
};
end(&mut body);
} else {
end(&mut self.body);
};


#[inline]
fn end<W: Write>(w: &mut W) {
match w.write(&[]) {
Ok(_) => match w.flush() {
Ok(_) => debug!("drop successful"),
Err(e) => debug!("error dropping request: {:?}", e)
},
Err(e) => debug!("error dropping request: {:?}", e)
}
}
}
}

#[cfg(test)]
mod tests {
use mock::MockStream;
use super::Response;

macro_rules! lines {
($s:ident = $($line:pat),+) => ({
let s = String::from_utf8($s.write).unwrap();
let mut lines = s.split_terminator("\r\n");

$(
match lines.next() {
Some($line) => (),
other => panic!("line mismatch: {:?} != {:?}", other, stringify!($line))
}
)+

assert_eq!(lines.next(), None);
})
}

#[test]
fn test_fresh_start() {
let mut stream = MockStream::new();
{
let res = Response::new(&mut stream);
res.start().unwrap().deconstruct();
}

lines! { stream =
"HTTP/1.1 200 OK",
_date,
_transfer_encoding,
""
}
}

#[test]
fn test_streaming_end() {
let mut stream = MockStream::new();
{
let res = Response::new(&mut stream);
res.start().unwrap().end().unwrap();
}

lines! { stream =
"HTTP/1.1 200 OK",
_date,
_transfer_encoding,
"",
"0",
"" // empty zero body
}
}

#[test]
fn test_fresh_drop() {
use status::StatusCode;
let mut stream = MockStream::new();
{
let mut res = Response::new(&mut stream);
*res.status_mut() = StatusCode::NotFound;
}

lines! { stream =
"HTTP/1.1 404 Not Found",
_date,
_transfer_encoding,
"",
"0",
"" // empty zero body
}
}

#[test]
fn test_streaming_drop() {
use status::StatusCode;
let mut stream = MockStream::new();
{
let mut res = Response::new(&mut stream);
*res.status_mut() = StatusCode::NotFound;
res.start().unwrap();
}

lines! { stream =
"HTTP/1.1 404 Not Found",
_date,
_transfer_encoding,
"",
"0",
"" // empty zero body
}
}
}

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