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Merge pull request #64 from alexcrichton/add-bytes
Move Framed from tokio-proto to core
This commit is contained in:
Alex Crichton
GitHub
commit
2c5e4ebba8
438
src/easy.rs
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438
src/easy.rs
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@ -0,0 +1,438 @@
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//! A module for working with "easy" types to interact with other parts of
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//! tokio-core.
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//!
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//! This module contains a number of concrete implementations of various
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//! abstractions in tokio-core. The contents of this module are not necessarily
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//! production ready but are intended to allow projects to get off the ground
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//! quickly while also showing off sample implementations of these traits.
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//!
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//! Currently this module primarily contains `EasyFramed`, a struct which
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//! implements the `FramedIo` trait in `tokio_core::io`. This structure allows
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//! simply defining a parser (via the `Parse` trait) and a serializer (via the
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//! `Serialize` trait) and transforming a stream of bytes into a stream of
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//! frames. Additionally the `Parse` trait passes an `EasyBuf`, another type
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//! here, which primarily supports `drain_to`, to extract bytes without copying
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//! them.
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//!
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//! For more information see the `EasyFramed` and `EasyBuf` types.
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use std::io;
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use std::ops::{Deref, DerefMut};
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use std::sync::Arc;
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use futures::{Async, Poll};
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use io::{Io, FramedIo};
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/// A reference counted buffer of bytes.
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///
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/// An `EasyBuf` is a representation of a byte buffer where sub-slices of it can
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/// be handed out efficiently, each with a `'static` lifetime which keeps the
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/// data alive. The buffer also supports mutation but may require bytes to be
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/// copied to complete the operation.
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pub struct EasyBuf {
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buf: Arc<Vec<u8>>,
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start: usize,
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end: usize,
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}
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/// An RAII object returned from `get_mut` which provides mutable access to the
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/// underlying `Vec<u8>`.
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pub struct EasyBufMut<'a> {
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buf: &'a mut Vec<u8>,
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end: &'a mut usize,
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}
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impl EasyBuf {
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/// Creates a new EasyBuf with no data and the default capacity.
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pub fn new() -> EasyBuf {
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EasyBuf::with_capacity(8 * 1024)
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}
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/// Creates a new EasyBuf with `cap` capacity.
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pub fn with_capacity(cap: usize) -> EasyBuf {
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EasyBuf {
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buf: Arc::new(Vec::with_capacity(cap)),
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start: 0,
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end: 0,
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}
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}
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/// Changes the starting index of this window to the index specified.
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///
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/// Returns the windows back to chain multiple calls to this method.
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///
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/// # Panics
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///
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/// This method will panic if `start` is out of bounds for the underlying
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/// slice or if it comes after the `end` configured in this window.
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fn set_start(&mut self, start: usize) -> &mut EasyBuf {
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assert!(start <= self.buf.as_ref().len());
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assert!(start <= self.end);
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self.start = start;
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self
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}
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/// Changes the end index of this window to the index specified.
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///
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/// Returns the windows back to chain multiple calls to this method.
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///
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/// # Panics
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///
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/// This method will panic if `end` is out of bounds for the underlying
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/// slice or if it comes after the `end` configured in this window.
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fn set_end(&mut self, end: usize) -> &mut EasyBuf {
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assert!(end <= self.buf.len());
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assert!(self.start <= end);
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self.end = end;
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self
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}
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/// Returns the number of bytes contained in this `EasyBuf`.
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pub fn len(&self) -> usize {
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self.end - self.start
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}
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/// Returns the inner contents of this `EasyBuf` as a slice.
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pub fn as_slice(&self) -> &[u8] {
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self.as_ref()
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}
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/// Splits the buffer into two at the given index.
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///
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/// Afterwards `self` contains elements `[0, at)`, and the returned `EasyBuf`
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/// contains elements `[at, len)`.
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///
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/// This is an O(1) operation that just increases the reference count and
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/// sets a few indexes.
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///
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/// # Panics
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///
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/// Panics if `at > len`
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pub fn split_off(&mut self, at: usize) -> EasyBuf {
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let mut other = EasyBuf { buf: self.buf.clone(), ..*self };
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let idx = self.start + at;
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other.set_start(idx);
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self.set_end(idx);
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return other
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}
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/// Splits the buffer into two at the given index.
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///
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/// Afterwards `self` contains elements `[at, len)`, and the returned `EasyBuf`
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/// contains elements `[0, at)`.
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///
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/// This is an O(1) operation that just increases the reference count and
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/// sets a few indexes.
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///
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/// # Panics
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///
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/// Panics if `at > len`
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pub fn drain_to(&mut self, at: usize) -> EasyBuf {
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let mut other = EasyBuf { buf: self.buf.clone(), ..*self };
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let idx = self.start + at;
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other.set_end(idx);
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self.set_start(idx);
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return other
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}
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/// Returns a mutable reference to the underlying growable buffer of bytes.
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///
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/// If this `EasyBuf` is the only instance pointing at the underlying buffer
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/// of bytes, a direct mutable reference will be returned. Otherwise the
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/// contents of this `EasyBuf` will be reallocated in a fresh `Vec<u8>`
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/// allocation with the same capacity as this allocation, and that
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/// allocation will be returned.
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///
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/// This operation **is not O(1)** as it may clone the entire contents of
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/// this buffer.
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///
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/// The returned `EasyBufMut` type implement `Deref` and `DerefMut` to
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/// `Vec<u8>` can the byte buffer can be manipulated using the standard
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/// `Vec<u8>` methods.
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pub fn get_mut(&mut self) -> EasyBufMut {
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// Fast path if we can get mutable access to our own current
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// buffer.
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//
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// TODO: this should be a match or an if-let
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if Arc::get_mut(&mut self.buf).is_some() {
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let buf = Arc::get_mut(&mut self.buf).unwrap();
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buf.drain(..self.start);
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self.start = 0;
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return EasyBufMut { buf: buf, end: &mut self.end }
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}
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// If we couldn't get access above then we give ourself a new buffer
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// here.
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let mut v = Vec::with_capacity(self.buf.capacity());
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v.extend_from_slice(self.as_ref());
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self.start = 0;
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self.buf = Arc::new(v);
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EasyBufMut {
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buf: Arc::get_mut(&mut self.buf).unwrap(),
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end: &mut self.end,
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}
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}
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}
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impl AsRef<[u8]> for EasyBuf {
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fn as_ref(&self) -> &[u8] {
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&self.buf[self.start..self.end]
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}
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}
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impl<'a> Deref for EasyBufMut<'a> {
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type Target = Vec<u8>;
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fn deref(&self) -> &Vec<u8> {
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self.buf
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}
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}
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impl<'a> DerefMut for EasyBufMut<'a> {
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fn deref_mut(&mut self) -> &mut Vec<u8> {
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self.buf
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}
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}
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impl<'a> Drop for EasyBufMut<'a> {
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fn drop(&mut self) {
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*self.end = self.buf.len();
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}
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}
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/// An implementation of the `FramedIo` trait building on instances of the
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/// `Parse` and `Serialize` traits.
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///
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/// Many I/O streams are simply a framed protocol on both the inbound and
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/// outbound halves. In essence the underlying stream of bytes can be converted
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/// to a stream of *frames*. This way instead of reading or writing bytes a
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/// stream deals with reading and writing frames.
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///
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/// This struct is essentially a convenience implementation of the `FramedIo`
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/// which only requires knowledge of how to parse and serialize types. It is
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/// constructed with an arbitrary `Io` instance along with how to parse and
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/// serialize the frames that this `EasyFramed` will be yielding.
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///
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/// This implementation of `FramedIo` uses the `EasyBuf` type from the `bytes`
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/// crate for the backing storage, which should allow for zero-copy parsing
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/// where possible.
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pub struct EasyFramed<T, P, S> {
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upstream: T,
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parse: P,
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serialize: S,
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eof: bool,
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is_readable: bool,
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rd: EasyBuf,
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wr: Vec<u8>,
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}
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/// Implementation of parsing a frame from an internal buffer.
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///
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/// This trait is used when constructing an instance of `EasyFramed`. It defines how
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/// to parse the incoming bytes on a stream to the specified type of frame for
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/// that framed I/O stream.
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///
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/// The primary method of this trait, `parse`, attempts to parse a method from a
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/// buffer of bytes. It has the option of returning `NotReady`, indicating that
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/// more bytes need to be read before parsing can continue as well.
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pub trait Parse {
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/// The type that this instance of `Parse` will attempt to be parsing.
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///
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/// This is typically a frame being parsed from an input stream, such as an
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/// HTTP request, a Redis command, etc.
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type Out;
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/// Attempts to parse a frame from the provided buffer of bytes.
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///
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/// This method is called by `EasyFramed` whenever bytes are ready to be parsed.
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/// The provided buffer of bytes is what's been read so far, and this
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/// instance of `Parse` can determine whether an entire frame is in the
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/// buffer and is ready to be returned.
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///
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/// If an entire frame is available, then this instance will remove those
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/// bytes from the buffer provided and return them as a parsed frame. Note
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/// that removing bytes from the provided buffer doesn't always necessarily
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/// copy the bytes, so this should be an efficient operation in most
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/// circumstances.
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///
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/// If the bytes look valid, but a frame isn't fully available yet, then
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/// `Async::NotReady` is returned. This indicates to the `EasyFramed` instance
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/// that it needs to read some more bytes before calling this method again.
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///
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/// Finally, if the bytes in the buffer are malformed then an error is
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/// returned indicating why. This informs `EasyFramed` that the stream is now
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/// corrupt and should be terminated.
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fn parse(&mut self, buf: &mut EasyBuf) -> Poll<Self::Out, io::Error>;
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/// A default method available to be called when there are no more bytes
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/// available to be read from the underlying I/O.
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///
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/// This method defaults to calling `parse` and returns an error if
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/// `NotReady` is returned. Typically this doesn't need to be implemented
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/// unless the framing protocol differs near the end of the stream.
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fn done(&mut self, buf: &mut EasyBuf) -> io::Result<Self::Out> {
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match try!(self.parse(buf)) {
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Async::Ready(frame) => Ok(frame),
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Async::NotReady => Err(io::Error::new(io::ErrorKind::Other,
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"bytes remaining on stream")),
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}
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}
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}
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/// A trait for serializing frames into a byte buffer.
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///
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/// This trait is used as a building block of `EasyFramed` to define how frames are
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/// serialized into bytes to get passed to the underlying byte stream. Each
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/// frame written to `EasyFramed` will be serialized with this trait to an internal
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/// buffer. That buffer is then written out when possible to the underlying I/O
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/// stream.
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pub trait Serialize {
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/// The frame that's being serialized to a byte buffer.
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///
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/// This type is the type of frame that's also being written to a `EasyFramed`.
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type In;
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/// Serializes a frame into the buffer provided.
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///
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/// This method will serialize `msg` into the byte buffer provided by `buf`.
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/// The `buf` provided is an internal buffer of the `EasyFramed` instance and
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/// will be written out when possible.
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fn serialize(&mut self, msg: Self::In, buf: &mut Vec<u8>);
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}
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impl<T, P, S> EasyFramed<T, P, S>
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where T: Io,
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P: Parse,
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S: Serialize,
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{
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/// Creates a new instance of `EasyFramed` from the given component pieces.
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///
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/// This method will create a new instance of `EasyFramed` which implements
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/// `FramedIo` for reading and writing frames from an underlying I/O stream.
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/// The `upstream` argument here is the byte-based I/O stream that it will
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/// be operating on. Data will be read from this stream and parsed with
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/// `parse` into frames. Frames written to this instance will be serialized
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/// by `serialize` and then written to `upstream`.
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///
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/// The `rd` and `wr` buffers provided are used for reading and writing
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/// bytes and provide a small amount of control over how buffering happens.
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pub fn new(upstream: T,
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parse: P,
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serialize: S) -> EasyFramed<T, P, S> {
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trace!("creating new framed transport");
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EasyFramed {
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upstream: upstream,
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parse: parse,
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serialize: serialize,
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is_readable: false,
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eof: false,
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rd: EasyBuf::new(),
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wr: Vec::with_capacity(8 * 1024),
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}
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}
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}
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impl<T, P, S> FramedIo for EasyFramed<T, P, S>
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where T: Io,
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P: Parse,
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S: Serialize,
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{
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type In = S::In;
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type Out = Option<P::Out>;
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fn poll_read(&mut self) -> Async<()> {
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if self.is_readable || self.upstream.poll_read().is_ready() {
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Async::Ready(())
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} else {
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Async::NotReady
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}
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}
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fn read(&mut self) -> Poll<Self::Out, io::Error> {
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loop {
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// If the read buffer has any pending data, then it could be
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// possible that `parse` will return a new frame. We leave it to
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// the parser to optimize detecting that more data is required.
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if self.is_readable {
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if self.eof {
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if self.rd.len() == 0 {
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return Ok(None.into())
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} else {
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let frame = try!(self.parse.done(&mut self.rd));
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return Ok(Some(frame).into())
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}
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}
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trace!("attempting to parse a frame");
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if let Async::Ready(frame) = try!(self.parse.parse(&mut self.rd)) {
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trace!("frame parsed from buffer");
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return Ok(Some(frame).into());
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}
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self.is_readable = false;
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}
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|
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assert!(!self.eof);
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// Otherwise, try to read more data and try again
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//
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// TODO: shouldn't read_to_end, that may read a lot
|
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let before = self.rd.len();
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let ret = self.upstream.read_to_end(&mut self.rd.get_mut());
|
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match ret {
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Ok(_n) => self.eof = true,
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Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
|
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if self.rd.len() == before {
|
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return Ok(Async::NotReady)
|
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}
|
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}
|
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Err(e) => return Err(e),
|
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}
|
||||
self.is_readable = true;
|
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}
|
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}
|
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|
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fn poll_write(&mut self) -> Async<()> {
|
||||
// Always accept writes and let the write buffer grow
|
||||
//
|
||||
// TODO: This may not be the best option for robustness, but for now it
|
||||
// makes the microbenchmarks happy.
|
||||
Async::Ready(())
|
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}
|
||||
|
||||
fn write(&mut self, msg: Self::In) -> Poll<(), io::Error> {
|
||||
if !self.poll_write().is_ready() {
|
||||
return Err(io::Error::new(io::ErrorKind::InvalidInput,
|
||||
"transport not currently writable"));
|
||||
}
|
||||
|
||||
// Serialize the msg
|
||||
self.serialize.serialize(msg, &mut self.wr);
|
||||
|
||||
// TODO: should provide some backpressure, such as when the buffer is
|
||||
// too full this returns `NotReady` or something like that.
|
||||
Ok(Async::Ready(()))
|
||||
}
|
||||
|
||||
fn flush(&mut self) -> Poll<(), io::Error> {
|
||||
// Try flushing the underlying IO
|
||||
try_nb!(self.upstream.flush());
|
||||
|
||||
trace!("flushing framed transport");
|
||||
|
||||
loop {
|
||||
if self.wr.len() == 0 {
|
||||
trace!("framed transport flushed");
|
||||
return Ok(Async::Ready(()));
|
||||
}
|
||||
|
||||
trace!("writing; remaining={:?}", self.wr.len());
|
||||
|
||||
let n = try_nb!(self.upstream.write(&self.wr));
|
||||
self.wr.drain(..n);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -131,6 +131,9 @@ pub trait Io: io::Read + io::Write {
|
||||
/// value that indicates "would block" the current future's task is arranged to
|
||||
/// receive a notification when the method would otherwise not indicate that it
|
||||
/// would block.
|
||||
///
|
||||
/// For a sample implementation of `FramedIo` you can take a look at the
|
||||
/// `EasyFramed` type in the `easy` module of htis crate.
|
||||
pub trait FramedIo {
|
||||
/// Messages written
|
||||
type In;
|
||||
|
||||
@ -113,3 +113,4 @@ mod heap;
|
||||
pub mod channel;
|
||||
pub mod net;
|
||||
pub mod reactor;
|
||||
pub mod easy;
|
||||
|
||||
116
tests/line-frames.rs
Normal file
116
tests/line-frames.rs
Normal file
@ -0,0 +1,116 @@
|
||||
extern crate tokio_core;
|
||||
extern crate env_logger;
|
||||
extern crate futures;
|
||||
|
||||
use std::io;
|
||||
use std::net::Shutdown;
|
||||
|
||||
use futures::{Future, Async, Poll};
|
||||
use futures::stream::Stream;
|
||||
use tokio_core::io::{FramedIo, write_all, read};
|
||||
use tokio_core::easy::{Parse, Serialize, EasyFramed, EasyBuf};
|
||||
use tokio_core::net::{TcpListener, TcpStream};
|
||||
use tokio_core::reactor::Core;
|
||||
|
||||
pub struct LineParser;
|
||||
pub struct LineSerialize;
|
||||
|
||||
impl Parse for LineParser {
|
||||
type Out = EasyBuf;
|
||||
|
||||
fn parse(&mut self, buf: &mut EasyBuf) -> Poll<EasyBuf, io::Error> {
|
||||
match buf.as_slice().iter().position(|&b| b == b'\n') {
|
||||
Some(i) => Ok(buf.drain_to(i + 1).into()),
|
||||
None => Ok(Async::NotReady),
|
||||
}
|
||||
}
|
||||
|
||||
fn done(&mut self, buf: &mut EasyBuf) -> io::Result<EasyBuf> {
|
||||
let amt = buf.len();
|
||||
Ok(buf.drain_to(amt))
|
||||
}
|
||||
}
|
||||
|
||||
impl Serialize for LineSerialize {
|
||||
type In = EasyBuf;
|
||||
|
||||
fn serialize(&mut self, msg: EasyBuf, into: &mut Vec<u8>) {
|
||||
into.extend_from_slice(msg.as_slice());
|
||||
}
|
||||
}
|
||||
|
||||
pub struct EchoFramed<T> {
|
||||
inner: T,
|
||||
}
|
||||
|
||||
impl<T, U> Future for EchoFramed<T>
|
||||
where T: FramedIo<In = U, Out = U>,
|
||||
{
|
||||
type Item = ();
|
||||
type Error = ();
|
||||
|
||||
fn poll(&mut self) -> Poll<(), ()> {
|
||||
// Try to write out any buffered messages if we have them.
|
||||
if self.inner.flush().expect("flush error").is_not_ready() {
|
||||
return Ok(Async::NotReady)
|
||||
}
|
||||
|
||||
// Wait until we can simultaneously read and write a message
|
||||
while self.inner.poll_read().is_ready() && self.inner.poll_write().is_ready() {
|
||||
let frame = match self.inner.read() {
|
||||
Ok(Async::Ready(frame)) => frame,
|
||||
Ok(Async::NotReady) => break,
|
||||
Err(e) => panic!("error in read: {}", e),
|
||||
};
|
||||
|
||||
match self.inner.write(frame) {
|
||||
Ok(Async::Ready(())) => {}
|
||||
Ok(Async::NotReady) => break,
|
||||
Err(e) => panic!("error in write: {}", e),
|
||||
}
|
||||
}
|
||||
|
||||
// If we wrote some frames try to flush again. Ignore whether this is
|
||||
// ready to finish or not as we're going to continue to return NotReady
|
||||
drop(self.inner.flush().expect("flush error"));
|
||||
|
||||
Ok(Async::NotReady)
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn echo() {
|
||||
drop(env_logger::init());
|
||||
|
||||
let mut core = Core::new().unwrap();
|
||||
let handle = core.handle();
|
||||
|
||||
let listener = TcpListener::bind(&"127.0.0.1:0".parse().unwrap(), &handle).unwrap();
|
||||
let addr = listener.local_addr().unwrap();
|
||||
let srv = listener.incoming().for_each(move |(socket, _)| {
|
||||
let framed = EasyFramed::new(socket, LineParser, LineSerialize);
|
||||
handle.spawn(EchoFramed { inner: framed });
|
||||
Ok(())
|
||||
});
|
||||
|
||||
let handle = core.handle();
|
||||
handle.spawn(srv.map_err(|e| panic!("srv error: {}", e)));
|
||||
|
||||
let client = TcpStream::connect(&addr, &handle);
|
||||
let client = core.run(client).unwrap();
|
||||
let (client, _) = core.run(write_all(client, b"a\n")).unwrap();
|
||||
let (client, buf, amt) = core.run(read(client, vec![0; 1024])).unwrap();
|
||||
assert_eq!(amt, 2);
|
||||
assert_eq!(&buf[..2], b"a\n");
|
||||
|
||||
let (client, _) = core.run(write_all(client, b"\nb\n")).unwrap();
|
||||
let (client, buf, amt) = core.run(read(client, buf)).unwrap();
|
||||
assert_eq!(amt, 3);
|
||||
assert_eq!(&buf[..3], b"\nb\n");
|
||||
|
||||
let (client, _) = core.run(write_all(client, b"b")).unwrap();
|
||||
client.shutdown(Shutdown::Write).unwrap();
|
||||
let (_client, buf, amt) = core.run(read(client, buf)).unwrap();
|
||||
assert_eq!(amt, 1);
|
||||
assert_eq!(&buf[..1], b"b");
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user