refactor complete_io

This commit is contained in:
quininer 2019-04-16 20:32:11 +08:00
parent 75b94acaba
commit 0485be9e4b
3 changed files with 76 additions and 32 deletions

View File

@ -1,4 +1,5 @@
use super::*;
use std::io::Write;
use rustls::Session;
@ -197,7 +198,7 @@ where IO: AsyncRead + AsyncWrite
}
let mut stream = Stream::new(&mut self.io, &mut self.session);
try_nb!(stream.complete_io());
try_nb!(stream.flush());
stream.io.shutdown()
}
}

View File

@ -15,51 +15,94 @@ pub trait WriteTls<'a, IO: AsyncRead + AsyncWrite, S: Session>: Read + Write {
fn write_tls(&mut self) -> io::Result<usize>;
}
#[derive(Clone, Copy)]
enum Focus {
Empty,
Readable,
Writable
}
impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
pub fn new(io: &'a mut IO, session: &'a mut S) -> Self {
Stream { io, session }
}
pub fn complete_io(&mut self) -> io::Result<(usize, usize)> {
// fork from https://github.com/ctz/rustls/blob/master/src/session.rs#L161
self.complete_inner_io(Focus::Empty)
}
let until_handshaked = self.session.is_handshaking();
let mut eof = false;
fn complete_read_io(&mut self) -> io::Result<usize> {
let n = self.session.read_tls(self.io)?;
self.session.process_new_packets()
.map_err(|err| {
// In case we have an alert to send describing this error,
// try a last-gasp write -- but don't predate the primary
// error.
let _ = self.write_tls();
io::Error::new(io::ErrorKind::InvalidData, err)
})?;
Ok(n)
}
fn complete_write_io(&mut self) -> io::Result<usize> {
self.write_tls()
}
fn complete_inner_io(&mut self, focus: Focus) -> io::Result<(usize, usize)> {
let mut wrlen = 0;
let mut rdlen = 0;
let mut eof = false;
loop {
let mut write_would_block = false;
let mut read_would_block = false;
while self.session.wants_write() {
wrlen += self.write_tls()?;
}
if !until_handshaked && wrlen > 0 {
return Ok((rdlen, wrlen));
}
if !eof && self.session.wants_read() {
match self.session.read_tls(self.io)? {
0 => eof = true,
n => rdlen += n
match self.complete_write_io() {
Ok(n) => wrlen += n,
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => {
write_would_block = true;
break
},
Err(err) => return Err(err)
}
}
match self.session.process_new_packets() {
Ok(_) => {},
Err(e) => {
// In case we have an alert to send describing this error,
// try a last-gasp write -- but don't predate the primary
// error.
let _ignored = self.write_tls();
if !eof && self.session.wants_read() {
match self.complete_read_io() {
Ok(0) => eof = true,
Ok(n) => rdlen += n,
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => read_would_block = true,
Err(err) => return Err(err)
}
}
return Err(io::Error::new(io::ErrorKind::InvalidData, e));
},
let would_block = match focus {
Focus::Empty => write_would_block || read_would_block,
Focus::Readable => read_would_block,
Focus::Writable => write_would_block,
};
match (eof, until_handshaked, self.session.is_handshaking()) {
(_, true, false) => return Ok((rdlen, wrlen)),
match (eof, self.session.is_handshaking(), would_block) {
(true, true, _) => return Err(io::ErrorKind::UnexpectedEof.into()),
(_, false, true) => {
let would_block = match focus {
Focus::Empty => rdlen == 0 && wrlen == 0,
Focus::Readable => rdlen == 0,
Focus::Writable => wrlen == 0
};
return if would_block {
Err(io::ErrorKind::WouldBlock.into())
} else {
Ok((rdlen, wrlen))
};
},
(_, false, _) => return Ok((rdlen, wrlen)),
(true, true, true) => return Err(io::Error::from(io::ErrorKind::UnexpectedEof)),
(_, true, true) => return Err(io::ErrorKind::WouldBlock.into()),
(..) => ()
}
}
@ -92,7 +135,7 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> WriteTls<'a, IO, S> for Stream<
impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Read for Stream<'a, IO, S> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
while self.session.wants_read() {
if let (0, 0) = self.complete_io()? {
if let (0, _) = self.complete_inner_io(Focus::Readable)? {
break
}
}
@ -104,7 +147,7 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Write for Stream<'a, IO, S> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let len = self.session.write(buf)?;
while self.session.wants_write() {
match self.complete_io() {
match self.complete_inner_io(Focus::Writable) {
Ok(_) => (),
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock && len != 0 => break,
Err(err) => return Err(err)
@ -126,8 +169,8 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Write for Stream<'a, IO, S> {
fn flush(&mut self) -> io::Result<()> {
self.session.flush()?;
if self.session.wants_write() {
self.complete_io()?;
while self.session.wants_write() {
self.complete_inner_io(Focus::Writable)?;
}
Ok(())
}

View File

@ -85,7 +85,7 @@ fn stream_good() -> io::Result<()> {
let mut buf = Vec::new();
stream.read_to_end(&mut buf)?;
assert_eq!(buf, FILE);
stream.write_all(b"Hello World!")?
stream.write_all(b"Hello World!")?;
}
let mut buf = String::new();