refactor complete_io
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75b94acaba
commit
0485be9e4b
@ -1,4 +1,5 @@
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use super::*;
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use std::io::Write;
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use rustls::Session;
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@ -197,7 +198,7 @@ where IO: AsyncRead + AsyncWrite
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}
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let mut stream = Stream::new(&mut self.io, &mut self.session);
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try_nb!(stream.complete_io());
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try_nb!(stream.flush());
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stream.io.shutdown()
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}
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}
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@ -15,51 +15,94 @@ pub trait WriteTls<'a, IO: AsyncRead + AsyncWrite, S: Session>: Read + Write {
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fn write_tls(&mut self) -> io::Result<usize>;
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}
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#[derive(Clone, Copy)]
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enum Focus {
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Empty,
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Readable,
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Writable
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}
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impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
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pub fn new(io: &'a mut IO, session: &'a mut S) -> Self {
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Stream { io, session }
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}
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pub fn complete_io(&mut self) -> io::Result<(usize, usize)> {
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// fork from https://github.com/ctz/rustls/blob/master/src/session.rs#L161
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self.complete_inner_io(Focus::Empty)
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}
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let until_handshaked = self.session.is_handshaking();
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let mut eof = false;
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fn complete_read_io(&mut self) -> io::Result<usize> {
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let n = self.session.read_tls(self.io)?;
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self.session.process_new_packets()
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.map_err(|err| {
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// In case we have an alert to send describing this error,
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// try a last-gasp write -- but don't predate the primary
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// error.
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let _ = self.write_tls();
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io::Error::new(io::ErrorKind::InvalidData, err)
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})?;
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Ok(n)
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}
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fn complete_write_io(&mut self) -> io::Result<usize> {
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self.write_tls()
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}
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fn complete_inner_io(&mut self, focus: Focus) -> io::Result<(usize, usize)> {
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let mut wrlen = 0;
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let mut rdlen = 0;
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let mut eof = false;
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loop {
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let mut write_would_block = false;
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let mut read_would_block = false;
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while self.session.wants_write() {
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wrlen += self.write_tls()?;
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}
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if !until_handshaked && wrlen > 0 {
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return Ok((rdlen, wrlen));
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}
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if !eof && self.session.wants_read() {
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match self.session.read_tls(self.io)? {
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0 => eof = true,
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n => rdlen += n
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match self.complete_write_io() {
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Ok(n) => wrlen += n,
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Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => {
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write_would_block = true;
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break
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},
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Err(err) => return Err(err)
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}
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}
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match self.session.process_new_packets() {
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Ok(_) => {},
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Err(e) => {
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// In case we have an alert to send describing this error,
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// try a last-gasp write -- but don't predate the primary
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// error.
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let _ignored = self.write_tls();
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if !eof && self.session.wants_read() {
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match self.complete_read_io() {
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Ok(0) => eof = true,
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Ok(n) => rdlen += n,
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Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => read_would_block = true,
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Err(err) => return Err(err)
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}
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}
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return Err(io::Error::new(io::ErrorKind::InvalidData, e));
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},
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let would_block = match focus {
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Focus::Empty => write_would_block || read_would_block,
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Focus::Readable => read_would_block,
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Focus::Writable => write_would_block,
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};
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match (eof, until_handshaked, self.session.is_handshaking()) {
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(_, true, false) => return Ok((rdlen, wrlen)),
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match (eof, self.session.is_handshaking(), would_block) {
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(true, true, _) => return Err(io::ErrorKind::UnexpectedEof.into()),
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(_, false, true) => {
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let would_block = match focus {
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Focus::Empty => rdlen == 0 && wrlen == 0,
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Focus::Readable => rdlen == 0,
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Focus::Writable => wrlen == 0
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};
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return if would_block {
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Err(io::ErrorKind::WouldBlock.into())
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} else {
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Ok((rdlen, wrlen))
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};
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},
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(_, false, _) => return Ok((rdlen, wrlen)),
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(true, true, true) => return Err(io::Error::from(io::ErrorKind::UnexpectedEof)),
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(_, true, true) => return Err(io::ErrorKind::WouldBlock.into()),
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(..) => ()
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}
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}
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@ -92,7 +135,7 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> WriteTls<'a, IO, S> for Stream<
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impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Read for Stream<'a, IO, S> {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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while self.session.wants_read() {
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if let (0, 0) = self.complete_io()? {
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if let (0, _) = self.complete_inner_io(Focus::Readable)? {
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break
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}
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}
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@ -104,7 +147,7 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Write for Stream<'a, IO, S> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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let len = self.session.write(buf)?;
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while self.session.wants_write() {
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match self.complete_io() {
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match self.complete_inner_io(Focus::Writable) {
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Ok(_) => (),
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Err(ref err) if err.kind() == io::ErrorKind::WouldBlock && len != 0 => break,
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Err(err) => return Err(err)
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@ -126,8 +169,8 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Write for Stream<'a, IO, S> {
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fn flush(&mut self) -> io::Result<()> {
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self.session.flush()?;
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if self.session.wants_write() {
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self.complete_io()?;
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while self.session.wants_write() {
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self.complete_inner_io(Focus::Writable)?;
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}
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Ok(())
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}
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@ -85,7 +85,7 @@ fn stream_good() -> io::Result<()> {
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let mut buf = Vec::new();
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stream.read_to_end(&mut buf)?;
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assert_eq!(buf, FILE);
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stream.write_all(b"Hello World!")?
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stream.write_all(b"Hello World!")?;
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}
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let mut buf = String::new();
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