refactor(body): separate body, payload, and chunk into their own internal mods

src/body/chunk.rs

@@ -0,0 +1,159 @@
+use std::fmt;
+
+use bytes::{Buf, Bytes};
+
+/// A piece of a message body.
+///
+/// These are returned by [`Body`](::Body). It is an efficient buffer type.
+///
+/// A `Chunk` can be easily created by many of Rust's standard types that
+/// represent a collection of bytes, using `Chunk::from`.
+pub struct Chunk {
+    /// The buffer of bytes making up this body.
+    bytes: Bytes,
+}
+
+// An unexported type to prevent locking `Chunk::into_iter()` to `Bytes::into_iter()`.
+#[derive(Debug)]
+pub struct IntoIter {
+    inner: <Bytes as IntoIterator>::IntoIter,
+}
+
+
+impl Chunk {
+    /// Converts this `Chunk` directly into the `Bytes` type without copies.
+    ///
+    /// This is simply an inherent alias for `Bytes::from(chunk)`, which exists,
+    /// but doesn't appear in rustdocs.
+    #[inline]
+    pub fn into_bytes(self) -> Bytes {
+        self.into()
+    }
+}
+
+impl Buf for Chunk {
+    #[inline]
+    fn remaining(&self) -> usize {
+        self.bytes.len()
+    }
+
+    #[inline]
+    fn bytes(&self) -> &[u8] {
+        &self.bytes
+    }
+
+    #[inline]
+    fn advance(&mut self, cnt: usize) {
+        self.bytes.advance(cnt);
+    }
+}
+
+impl From<Vec<u8>> for Chunk {
+    #[inline]
+    fn from(v: Vec<u8>) -> Chunk {
+        Chunk::from(Bytes::from(v))
+    }
+}
+
+impl From<&'static [u8]> for Chunk {
+    #[inline]
+    fn from(slice: &'static [u8]) -> Chunk {
+        Chunk::from(Bytes::from_static(slice))
+    }
+}
+
+impl From<String> for Chunk {
+    #[inline]
+    fn from(s: String) -> Chunk {
+        s.into_bytes().into()
+    }
+}
+
+impl From<&'static str> for Chunk {
+    #[inline]
+    fn from(slice: &'static str) -> Chunk {
+        slice.as_bytes().into()
+    }
+}
+
+impl From<Bytes> for Chunk {
+    #[inline]
+    fn from(bytes: Bytes) -> Chunk {
+        Chunk {
+            bytes: bytes,
+        }
+    }
+}
+
+impl From<Chunk> for Bytes {
+    #[inline]
+    fn from(chunk: Chunk) -> Bytes {
+        chunk.bytes
+    }
+}
+
+impl ::std::ops::Deref for Chunk {
+    type Target = [u8];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        self.as_ref()
+    }
+}
+
+impl AsRef<[u8]> for Chunk {
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        &self.bytes
+    }
+}
+
+impl fmt::Debug for Chunk {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(self.as_ref(), f)
+    }
+}
+
+impl Default for Chunk {
+    #[inline]
+    fn default() -> Chunk {
+        Chunk::from(Bytes::new())
+    }
+}
+
+impl IntoIterator for Chunk {
+    type Item = u8;
+    type IntoIter = IntoIter;
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        IntoIter {
+            inner: self.bytes.into_iter(),
+        }
+    }
+}
+
+impl Extend<u8> for Chunk {
+    #[inline]
+    fn extend<T>(&mut self, iter: T) where T: IntoIterator<Item=u8> {
+        self.bytes.extend(iter)
+    }
+}
+
+impl Iterator for IntoIter {
+    type Item = u8;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+}
+
+impl ExactSizeIterator for IntoIter {}
+