146 lines
3.2 KiB
Rust
146 lines
3.2 KiB
Rust
use std::cmp;
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use std::io::{self, Read, Write};
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use futures::Async;
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use tokio::io::Io;
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#[derive(Debug)]
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pub struct Buf {
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vec: Vec<u8>
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}
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impl Buf {
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pub fn new() -> Buf {
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Buf::wrap(vec![])
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}
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pub fn wrap(vec: Vec<u8>) -> Buf {
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Buf {
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vec: vec,
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}
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}
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}
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impl ::std::ops::Deref for Buf {
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type Target = [u8];
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fn deref(&self) -> &[u8] {
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&self.vec
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}
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}
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impl<S: AsRef<[u8]>> PartialEq<S> for Buf {
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fn eq(&self, other: &S) -> bool {
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self.vec == other.as_ref()
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}
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}
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impl Write for Buf {
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fn write(&mut self, data: &[u8]) -> io::Result<usize> {
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self.vec.extend(data);
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Ok(data.len())
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}
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fn flush(&mut self) -> io::Result<()> {
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Ok(())
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}
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}
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impl Read for Buf {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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(&*self.vec).read(buf)
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}
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}
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#[derive(Debug)]
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pub struct AsyncIo<T> {
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inner: T,
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bytes_until_block: usize,
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error: Option<io::Error>,
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}
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impl<T> AsyncIo<T> {
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pub fn new(inner: T, bytes: usize) -> AsyncIo<T> {
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AsyncIo {
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inner: inner,
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bytes_until_block: bytes,
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error: None,
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}
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}
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pub fn block_in(&mut self, bytes: usize) {
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self.bytes_until_block = bytes;
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}
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pub fn error(&mut self, err: io::Error) {
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self.error = Some(err);
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}
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}
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impl AsyncIo<Buf> {
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pub fn new_buf<T: Into<Vec<u8>>>(buf: T, bytes: usize) -> AsyncIo<Buf> {
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AsyncIo::new(Buf::wrap(buf.into()), bytes)
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}
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}
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impl<T: Read> Read for AsyncIo<T> {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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if let Some(err) = self.error.take() {
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Err(err)
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} else if self.bytes_until_block == 0 {
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Err(io::Error::new(io::ErrorKind::WouldBlock, "mock block"))
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} else {
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let n = cmp::min(self.bytes_until_block, buf.len());
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let n = try!(self.inner.read(&mut buf[..n]));
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self.bytes_until_block -= n;
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Ok(n)
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}
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}
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}
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impl<T: Write> Write for AsyncIo<T> {
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fn write(&mut self, data: &[u8]) -> io::Result<usize> {
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if let Some(err) = self.error.take() {
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Err(err)
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} else if self.bytes_until_block == 0 {
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Err(io::Error::new(io::ErrorKind::WouldBlock, "mock block"))
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} else {
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trace!("AsyncIo::write() block_in = {}, data.len() = {}", self.bytes_until_block, data.len());
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let n = cmp::min(self.bytes_until_block, data.len());
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let n = try!(self.inner.write(&data[..n]));
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self.bytes_until_block -= n;
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Ok(n)
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}
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}
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fn flush(&mut self) -> io::Result<()> {
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self.inner.flush()
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}
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}
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impl<T: Read + Write> Io for AsyncIo<T> {
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fn poll_read(&mut self) -> Async<()> {
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if self.bytes_until_block == 0 {
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Async::NotReady
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} else {
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Async::Ready(())
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}
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}
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fn poll_write(&mut self) -> Async<()> {
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if self.bytes_until_block == 0 {
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Async::NotReady
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} else {
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Async::Ready(())
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}
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}
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}
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impl ::std::ops::Deref for AsyncIo<Buf> {
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type Target = [u8];
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fn deref(&self) -> &[u8] {
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&self.inner
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}
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}
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