add response content encoding

Cargo.toml

@@ -4,7 +4,7 @@ version = "0.3.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
 description = "Actix web framework"
 readme = "README.md"
-keywords = ["actix", "actor", "http", "web", "async", "tokio", "futures", "web"]
+keywords = ["http", "web", "async", "tokio", "futures"]
 homepage = "https://github.com/actix/actix-web"
 repository = "https://github.com/actix/actix-web.git"
 documentation = "https://docs.rs/actix-web/"
@@ -16,7 +16,7 @@ build = "build.rs"
 
 [badges]
 travis-ci = { repository = "actix/actix-web", branch = "master" }
-appveyor = { repository = "fafhrd91/actix-web-hdy9d" }
+appveyor = { repository = "actix/actix-web" }
 codecov = { repository = "actix/actix-web", branch = "master", service = "github" }
 
 [lib]

README.md

@@ -17,6 +17,7 @@ Actix web is licensed under the [Apache-2.0 license](http://opensource.org/licen
   * Streaming and pipelining
   * Keep-alive and slow requests handling
   * [WebSockets](https://actix.github.io/actix-web/actix_web/ws/index.html)
+  * Transparent content compression/decompression
   * Configurable request routing
   * Multipart streams
   * Middlewares

examples/basic.rs

@@ -30,7 +30,7 @@ fn index_async(req: &mut HttpRequest, _payload: Payload, state: &()) -> Once<act
             .into()))
 }
 
-/// handle with path parameters like `/name/{name}/`
+/// handle with path parameters like `/user/{name}/`
 fn with_param(req: &mut HttpRequest, _payload: Payload, state: &())
               -> HandlerResult<HttpResponse>
 {

src/body.rs

@@ -50,6 +50,14 @@ impl Body {
         }
     }
 
+    /// Is this binary body.
+    pub fn is_binary(&self) -> bool {
+        match *self {
+            Body::Binary(_) => true,
+            _ => false
+        }
+    }
+
     /// Create body from slice (copy)
     pub fn from_slice(s: &[u8]) -> Body {
         Body::Binary(BinaryBody::Bytes(Bytes::from(s)))

src/date.rs

@@ -1,21 +1,20 @@
 use std::cell::RefCell;
 use std::fmt::{self, Write};
 use std::str;
-
 use time::{self, Duration};
-use bytes::BytesMut;
 
 // "Sun, 06 Nov 1994 08:49:37 GMT".len()
 pub const DATE_VALUE_LENGTH: usize = 29;
 
-pub fn extend(dst: &mut BytesMut) {
+pub fn extend(dst: &mut [u8]) {
     CACHED.with(|cache| {
         let mut cache = cache.borrow_mut();
         let now = time::get_time();
         if now > cache.next_update {
             cache.update(now);
         }
-        dst.extend_from_slice(cache.buffer());
+
+        dst.copy_from_slice(cache.buffer());
     })
 }
 
@@ -61,9 +60,9 @@ fn test_date_len() {
 
 #[test]
 fn test_date() {
-    let mut buf1 = BytesMut::new();
+    let mut buf1 = [0u8; 29];
     extend(&mut buf1);
-    let mut buf2 = BytesMut::new();
+    let mut buf2 = [0u8; 29];
     extend(&mut buf2);
     assert_eq!(buf1, buf2);
 }

src/encoding.rs

@@ -1,15 +1,24 @@
-use std::{io, cmp};
+use std::{io, cmp, mem};
 use std::io::{Read, Write};
+use std::fmt::Write as FmtWrite;
+use std::str::FromStr;
 
-use http::header::{HeaderMap, CONTENT_ENCODING};
+use http::Version;
+use http::header::{HeaderMap, HeaderValue,
+                   ACCEPT_ENCODING, CONNECTION,
+                   CONTENT_ENCODING, CONTENT_LENGTH, TRANSFER_ENCODING};
+use flate2::Compression;
 use flate2::read::{GzDecoder};
-use flate2::write::{DeflateDecoder};
-use brotli2::write::BrotliDecoder;
+use flate2::write::{GzEncoder, DeflateDecoder, DeflateEncoder};
+use brotli2::write::{BrotliDecoder, BrotliEncoder};
 use bytes::{Bytes, BytesMut, BufMut, Writer};
 
+use body::Body;
+use httprequest::HttpRequest;
+use httpresponse::HttpResponse;
 use payload::{PayloadSender, PayloadWriter, PayloadError};
 
-/// Represents various types of connection
+/// Represents supported types of content encodings
 #[derive(Copy, Clone, PartialEq, Debug)]
 pub enum ContentEncoding {
     /// Automatically select encoding based on encoding negotiation
@@ -24,6 +33,17 @@ pub enum ContentEncoding {
     Identity,
 }
 
+impl ContentEncoding {
+    fn as_str(&self) -> &'static str {
+        match *self {
+            ContentEncoding::Br => "br",
+            ContentEncoding::Gzip => "gzip",
+            ContentEncoding::Deflate => "deflate",
+            ContentEncoding::Identity | ContentEncoding::Auto => "identity",
+        }
+    }
+}
+
 impl<'a> From<&'a str> for ContentEncoding {
     fn from(s: &'a str) -> ContentEncoding {
         match s.trim().to_lowercase().as_ref() {
@@ -136,6 +156,7 @@ impl io::Write for BytesWriter {
     }
 }
 
+/// Payload wrapper with content decompression support
 pub(crate) struct EncodedPayload {
     inner: PayloadSender,
     decoder: Decoder,
@@ -246,15 +267,13 @@ impl PayloadWriter for EncodedPayload {
         }
         match self.decoder {
             Decoder::Br(ref mut decoder) => {
-                if decoder.write(&data).is_ok() {
-                    if decoder.flush().is_ok() {
+                if decoder.write(&data).is_ok() && decoder.flush().is_ok() {
                     let b = decoder.get_mut().buf.take().freeze();
                     if !b.is_empty() {
                         self.inner.feed_data(b);
                     }
                     return
                 }
-                }
                 trace!("Error decoding br encoding");
             }
 
@@ -292,15 +311,13 @@ impl PayloadWriter for EncodedPayload {
             }
 
             Decoder::Deflate(ref mut decoder) => {
-                if decoder.write(&data).is_ok() {
-                    if decoder.flush().is_ok() {
+                if decoder.write(&data).is_ok() && decoder.flush().is_ok() {
                     let b = decoder.get_mut().buf.take().freeze();
                     if !b.is_empty() {
                         self.inner.feed_data(b);
                     }
                     return
                 }
-                }
                 trace!("Error decoding deflate encoding");
             }
             Decoder::Identity => {
@@ -318,3 +335,480 @@ impl PayloadWriter for EncodedPayload {
         self.inner.capacity()
     }
 }
+
+pub(crate) struct PayloadEncoder(ContentEncoder);
+
+impl Default for PayloadEncoder {
+    fn default() -> PayloadEncoder {
+        PayloadEncoder(ContentEncoder::Identity(TransferEncoding::eof()))
+    }
+}
+
+impl PayloadEncoder {
+
+    pub fn new(req: &HttpRequest, resp: &mut HttpResponse) -> PayloadEncoder {
+        let version = resp.version().unwrap_or_else(|| req.version());
+        let body = resp.replace_body(Body::Empty);
+        let has_body = if let Body::Empty = body { false } else { true };
+
+        // Enable content encoding only if response does not contain Content-Encoding header
+        let encoding = if has_body && !resp.headers.contains_key(CONTENT_ENCODING) {
+            let encoding = match *resp.content_encoding() {
+                ContentEncoding::Auto => {
+                    // negotiate content-encoding
+                    if let Some(val) = req.headers().get(ACCEPT_ENCODING) {
+                        if let Ok(enc) = val.to_str() {
+                            AcceptEncoding::parse(enc)
+                        } else {
+                            ContentEncoding::Identity
+                        }
+                    } else {
+                        ContentEncoding::Identity
+                    }
+                }
+                encoding => encoding,
+            };
+            resp.headers.insert(CONTENT_ENCODING, HeaderValue::from_static(encoding.as_str()));
+            encoding
+        } else {
+            ContentEncoding::Identity
+        };
+
+        // in general case it is very expensive to get compressed payload length,
+        // just switch to chunked encoding
+        let compression = encoding != ContentEncoding::Identity;
+
+        let transfer = match body {
+            Body::Empty => {
+                if resp.chunked() {
+                    error!("Chunked transfer is enabled but body is set to Empty");
+                }
+                resp.headers.insert(CONTENT_LENGTH, HeaderValue::from_static("0"));
+                resp.headers.remove(TRANSFER_ENCODING);
+                TransferEncoding::length(0)
+            },
+            Body::Length(n) => {
+                if resp.chunked() {
+                    error!("Chunked transfer is enabled but body with specific length is specified");
+                }
+                if compression {
+                    resp.headers.remove(CONTENT_LENGTH);
+                    if version == Version::HTTP_2 {
+                        resp.headers.remove(TRANSFER_ENCODING);
+                        TransferEncoding::eof()
+                    } else {
+                        resp.headers.insert(
+                            TRANSFER_ENCODING, HeaderValue::from_static("chunked"));
+                        TransferEncoding::chunked()
+                    }
+                } else {
+                    resp.headers.insert(
+                        CONTENT_LENGTH,
+                        HeaderValue::from_str(format!("{}", n).as_str()).unwrap());
+                    resp.headers.remove(TRANSFER_ENCODING);
+                    TransferEncoding::length(n)
+                }
+            },
+            Body::Binary(ref bytes) => {
+                if compression {
+                    resp.headers.remove(CONTENT_LENGTH);
+                    if version == Version::HTTP_2 {
+                        resp.headers.remove(TRANSFER_ENCODING);
+                        TransferEncoding::eof()
+                    } else {
+                        resp.headers.insert(
+                            TRANSFER_ENCODING, HeaderValue::from_static("chunked"));
+                        TransferEncoding::chunked()
+                    }
+                } else {
+                    resp.headers.insert(
+                        CONTENT_LENGTH,
+                        HeaderValue::from_str(format!("{}", bytes.len()).as_str()).unwrap());
+                    resp.headers.remove(TRANSFER_ENCODING);
+                    TransferEncoding::length(bytes.len() as u64)
+                }
+            }
+            Body::Streaming => {
+                if resp.chunked() {
+                    resp.headers.remove(CONTENT_LENGTH);
+                    if version != Version::HTTP_11 {
+                        error!("Chunked transfer encoding is forbidden for {:?}", version);
+                    }
+                    if version == Version::HTTP_2 {
+                        resp.headers.remove(TRANSFER_ENCODING);
+                        TransferEncoding::eof()
+                    } else {
+                        resp.headers.insert(
+                            TRANSFER_ENCODING, HeaderValue::from_static("chunked"));
+                        TransferEncoding::chunked()
+                    }
+                } else {
+                    TransferEncoding::eof()
+                }
+            }
+            Body::Upgrade => {
+                if version == Version::HTTP_2 {
+                    error!("Connection upgrade is forbidden for HTTP/2");
+                } else {
+                    resp.headers.insert(CONNECTION, HeaderValue::from_static("upgrade"));
+                }
+                TransferEncoding::eof()
+            }
+        };
+        resp.replace_body(body);
+
+        PayloadEncoder(
+            match encoding {
+                ContentEncoding::Deflate => ContentEncoder::Deflate(
+                    DeflateEncoder::new(transfer, Compression::Default)),
+                ContentEncoding::Gzip => ContentEncoder::Gzip(
+                    GzEncoder::new(transfer, Compression::Default)),
+                ContentEncoding::Br => ContentEncoder::Br(
+                    BrotliEncoder::new(transfer, 6)),
+                ContentEncoding::Identity => ContentEncoder::Identity(transfer),
+                ContentEncoding::Auto =>
+                    unreachable!()
+            }
+        )
+    }
+}
+
+impl PayloadEncoder {
+
+    pub fn len(&self) -> usize {
+        self.0.get_ref().len()
+    }
+
+    pub fn get_mut(&mut self) -> &mut BytesMut {
+        self.0.get_mut()
+    }
+
+    pub fn is_eof(&self) -> bool {
+        self.0.is_eof()
+    }
+
+    pub fn write(&mut self, payload: &[u8]) -> Result<(), io::Error> {
+        self.0.write(payload)
+    }
+
+    pub fn write_eof(&mut self) -> Result<(), io::Error> {
+        self.0.write_eof()
+    }
+}
+
+enum ContentEncoder {
+    Deflate(DeflateEncoder<TransferEncoding>),
+    Gzip(GzEncoder<TransferEncoding>),
+    Br(BrotliEncoder<TransferEncoding>),
+    Identity(TransferEncoding),
+}
+
+impl ContentEncoder {
+
+    pub fn is_eof(&self) -> bool {
+        match *self {
+            ContentEncoder::Br(ref encoder) =>
+                encoder.get_ref().is_eof(),
+            ContentEncoder::Deflate(ref encoder) =>
+                encoder.get_ref().is_eof(),
+            ContentEncoder::Gzip(ref encoder) =>
+                encoder.get_ref().is_eof(),
+            ContentEncoder::Identity(ref encoder) =>
+                encoder.is_eof(),
+        }
+    }
+
+    pub fn get_ref(&self) -> &BytesMut {
+        match *self {
+            ContentEncoder::Br(ref encoder) =>
+                &encoder.get_ref().buffer,
+            ContentEncoder::Deflate(ref encoder) =>
+                &encoder.get_ref().buffer,
+            ContentEncoder::Gzip(ref encoder) =>
+                &encoder.get_ref().buffer,
+            ContentEncoder::Identity(ref encoder) =>
+                &encoder.buffer,
+        }
+    }
+
+    pub fn get_mut(&mut self) -> &mut BytesMut {
+        match *self {
+            ContentEncoder::Br(ref mut encoder) =>
+                &mut encoder.get_mut().buffer,
+            ContentEncoder::Deflate(ref mut encoder) =>
+                &mut encoder.get_mut().buffer,
+            ContentEncoder::Gzip(ref mut encoder) =>
+                &mut encoder.get_mut().buffer,
+            ContentEncoder::Identity(ref mut encoder) =>
+                &mut encoder.buffer,
+        }
+    }
+
+    pub fn write_eof(&mut self) -> Result<(), io::Error> {
+        let encoder = mem::replace(self, ContentEncoder::Identity(TransferEncoding::eof()));
+
+        match encoder {
+            ContentEncoder::Br(encoder) => {
+                match encoder.finish() {
+                    Ok(mut writer) => {
+                        writer.encode_eof();
+                        *self = ContentEncoder::Identity(writer);
+                        Ok(())
+                    },
+                    Err(err) => Err(err),
+                }
+            }
+            ContentEncoder::Gzip(encoder) => {
+                match encoder.finish() {
+                    Ok(mut writer) => {
+                        writer.encode_eof();
+                        *self = ContentEncoder::Identity(writer);
+                        Ok(())
+                    },
+                    Err(err) => Err(err),
+                }
+            },
+            ContentEncoder::Deflate(encoder) => {
+                match encoder.finish() {
+                    Ok(mut writer) => {
+                        writer.encode_eof();
+                        *self = ContentEncoder::Identity(writer);
+                        Ok(())
+                    },
+                    Err(err) => Err(err),
+                }
+            },
+            ContentEncoder::Identity(mut writer) => {
+                writer.encode_eof();
+                *self = ContentEncoder::Identity(writer);
+                Ok(())
+            }
+        }
+    }
+
+    pub fn write(&mut self, data: &[u8]) -> Result<(), io::Error> {
+        match *self {
+            ContentEncoder::Br(ref mut encoder) => {
+                match encoder.write(data) {
+                    Ok(_) => {
+                        encoder.flush()
+                    },
+                    Err(err) => {
+                        trace!("Error decoding br encoding: {}", err);
+                        Err(err)
+                    },
+                }
+            },
+            ContentEncoder::Gzip(ref mut encoder) => {
+                match encoder.write(data) {
+                    Ok(_) => {
+                        encoder.flush()
+                    },
+                    Err(err) => {
+                        trace!("Error decoding br encoding: {}", err);
+                        Err(err)
+                    },
+                }
+            }
+            ContentEncoder::Deflate(ref mut encoder) => {
+                match encoder.write(data) {
+                    Ok(_) => {
+                        encoder.flush()
+                    },
+                    Err(err) => {
+                        trace!("Error decoding deflate encoding: {}", err);
+                        Err(err)
+                    },
+                }
+            }
+            ContentEncoder::Identity(ref mut encoder) => {
+                encoder.write_all(data)?;
+                Ok(())
+            }
+        }
+    }
+}
+
+/// Encoders to handle different Transfer-Encodings.
+#[derive(Debug, Clone)]
+pub(crate) struct TransferEncoding {
+    kind: TransferEncodingKind,
+    buffer: BytesMut,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+enum TransferEncodingKind {
+    /// An Encoder for when Transfer-Encoding includes `chunked`.
+    Chunked(bool),
+    /// An Encoder for when Content-Length is set.
+    ///
+    /// Enforces that the body is not longer than the Content-Length header.
+    Length(u64),
+    /// An Encoder for when Content-Length is not known.
+    ///
+    /// Appliction decides when to stop writing.
+    Eof,
+}
+
+impl TransferEncoding {
+
+    pub fn eof() -> TransferEncoding {
+        TransferEncoding {
+            kind: TransferEncodingKind::Eof,
+            buffer: BytesMut::new(),
+        }
+    }
+
+    pub fn chunked() -> TransferEncoding {
+        TransferEncoding {
+            kind: TransferEncodingKind::Chunked(false),
+            buffer: BytesMut::new(),
+        }
+    }
+
+    pub fn length(len: u64) -> TransferEncoding {
+        TransferEncoding {
+            kind: TransferEncodingKind::Length(len),
+            buffer: BytesMut::new(),
+        }
+    }
+
+    pub fn is_eof(&self) -> bool {
+        match self.kind {
+            TransferEncodingKind::Eof => true,
+            TransferEncodingKind::Chunked(ref eof) =>
+                *eof,
+            TransferEncodingKind::Length(ref remaining) =>
+                *remaining == 0,
+        }
+    }
+
+    /// Encode message. Return `EOF` state of encoder
+    pub fn encode(&mut self, msg: &[u8]) -> bool {
+        match self.kind {
+            TransferEncodingKind::Eof => {
+                self.buffer.extend(msg);
+                msg.is_empty()
+            },
+            TransferEncodingKind::Chunked(ref mut eof) => {
+                if *eof {
+                    return true;
+                }
+
+                if msg.is_empty() {
+                    *eof = true;
+                    self.buffer.extend(b"0\r\n\r\n");
+                } else {
+                    write!(self.buffer, "{:X}\r\n", msg.len()).unwrap();
+                    self.buffer.extend(msg);
+                    self.buffer.extend(b"\r\n");
+                }
+                *eof
+            },
+            TransferEncodingKind::Length(ref mut remaining) => {
+                if msg.is_empty() {
+                    return *remaining == 0
+                }
+                let max = cmp::min(*remaining, msg.len() as u64);
+                trace!("sized write = {}", max);
+                self.buffer.extend(msg[..max as usize].as_ref());
+
+                *remaining -= max as u64;
+                trace!("encoded {} bytes, remaining = {}", max, remaining);
+                *remaining == 0
+            },
+        }
+    }
+
+    /// Encode eof. Return `EOF` state of encoder
+    pub fn encode_eof(&mut self) {
+        match self.kind {
+            TransferEncodingKind::Eof | TransferEncodingKind::Length(_) => (),
+            TransferEncodingKind::Chunked(ref mut eof) => {
+                if !*eof {
+                    *eof = true;
+                    self.buffer.extend(b"0\r\n\r\n");
+                }
+            },
+        }
+    }
+}
+
+impl io::Write for TransferEncoding {
+
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.encode(buf);
+        Ok(buf.len())
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+
+struct AcceptEncoding {
+    encoding: ContentEncoding,
+    quality: f64,
+}
+
+impl Eq for AcceptEncoding {}
+
+impl Ord for AcceptEncoding {
+    fn cmp(&self, other: &AcceptEncoding) -> cmp::Ordering {
+        if self.quality > other.quality {
+            cmp::Ordering::Less
+        } else if self.quality < other.quality {
+            cmp::Ordering::Greater
+        } else {
+            cmp::Ordering::Equal
+        }
+    }
+}
+
+impl PartialOrd for AcceptEncoding {
+    fn partial_cmp(&self, other: &AcceptEncoding) -> Option<cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl PartialEq for AcceptEncoding {
+    fn eq(&self, other: &AcceptEncoding) -> bool {
+        self.quality == other.quality
+    }
+}
+
+impl AcceptEncoding {
+    fn new(tag: &str) -> Option<AcceptEncoding> {
+        let parts: Vec<&str> = tag.split(';').collect();
+        let encoding = match parts.len() {
+            0 => return None,
+            _ => ContentEncoding::from(parts[0]),
+        };
+        let quality = match parts.len() {
+            1 => 1.0,
+            _ => match f64::from_str(parts[1]) {
+                Ok(q) => q,
+                Err(_) => 0.0,
+            }
+        };
+        Some(AcceptEncoding {
+            encoding: encoding,
+            quality: quality,
+        })
+    }
+
+    /// Parse a raw Accept-Encoding header value into an ordered list.
+    pub fn parse(raw: &str) -> ContentEncoding {
+        let mut encodings: Vec<_> =
+            raw.replace(' ', "").split(',').map(|l| AcceptEncoding::new(l)).collect();
+        encodings.sort();
+
+        for enc in encodings {
+            if let Some(enc) = enc {
+                return enc.encoding
+            }
+        }
+        ContentEncoding::Identity
+    }
+}

src/h1writer.rs

@@ -1,14 +1,13 @@
-use std::{cmp, io};
+use std::io;
 use std::fmt::Write;
-use bytes::BytesMut;
 use futures::{Async, Poll};
 use tokio_io::AsyncWrite;
 use http::{Version, StatusCode};
-use http::header::{HeaderValue,
-                   CONNECTION, CONTENT_TYPE, CONTENT_LENGTH, TRANSFER_ENCODING, DATE};
+use http::header::{HeaderValue, CONNECTION, CONTENT_TYPE, DATE};
 
 use date;
 use body::Body;
+use encoding::PayloadEncoder;
 use httprequest::HttpRequest;
 use httpresponse::HttpResponse;
 
@@ -37,9 +36,8 @@ pub(crate) trait Writer {
 
 pub(crate) struct H1Writer<T: AsyncWrite> {
     stream: Option<T>,
-    buffer: BytesMut,
     started: bool,
-    encoder: Encoder,
+    encoder: PayloadEncoder,
     upgrade: bool,
     keepalive: bool,
     disconnected: bool,
@@ -50,9 +48,8 @@ impl<T: AsyncWrite> H1Writer<T> {
     pub fn new(stream: T) -> H1Writer<T> {
         H1Writer {
             stream: Some(stream),
-            buffer: BytesMut::new(),
             started: false,
-            encoder: Encoder::length(0),
+            encoder: PayloadEncoder::default(),
             upgrade: false,
             keepalive: false,
             disconnected: false,
@@ -68,8 +65,7 @@ impl<T: AsyncWrite> H1Writer<T> {
     }
 
     pub fn disconnected(&mut self) {
-        let len = self.buffer.len();
-        self.buffer.split_to(len);
+        self.encoder.get_mut().take();
     }
 
     pub fn keepalive(&self) -> bool {
@@ -77,14 +73,16 @@ impl<T: AsyncWrite> H1Writer<T> {
     }
 
     fn write_to_stream(&mut self) -> Result<WriterState, io::Error> {
+        let buffer = self.encoder.get_mut();
+
         if let Some(ref mut stream) = self.stream {
-            while !self.buffer.is_empty() {
-                match stream.write(self.buffer.as_ref()) {
+            while !buffer.is_empty() {
+                match stream.write(buffer.as_ref()) {
                     Ok(n) => {
-                        self.buffer.split_to(n);
+                        buffer.split_to(n);
                     },
                     Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
-                        if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+                        if buffer.len() > MAX_WRITE_BUFFER_SIZE {
                             return Ok(WriterState::Pause)
                         } else {
                             return Ok(WriterState::Done)
@@ -106,58 +104,12 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         trace!("Prepare message status={:?}", msg.status);
 
         // prepare task
-        let mut extra = 0;
-        let body = msg.replace_body(Body::Empty);
-        let version = msg.version().unwrap_or_else(|| req.version());
         self.started = true;
+        self.encoder = PayloadEncoder::new(req, msg);
         self.keepalive = msg.keep_alive().unwrap_or_else(|| req.keep_alive());
 
-        match body {
-            Body::Empty => {
-                if msg.chunked() {
-                    error!("Chunked transfer is enabled but body is set to Empty");
-                }
-                msg.headers.insert(CONTENT_LENGTH, HeaderValue::from_static("0"));
-                msg.headers.remove(TRANSFER_ENCODING);
-                self.encoder = Encoder::length(0);
-            },
-            Body::Length(n) => {
-                if msg.chunked() {
-                    error!("Chunked transfer is enabled but body with specific length is specified");
-                }
-                msg.headers.insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::from_str(format!("{}", n).as_str()).unwrap());
-                msg.headers.remove(TRANSFER_ENCODING);
-                self.encoder = Encoder::length(n);
-            },
-            Body::Binary(ref bytes) => {
-                extra = bytes.len();
-                msg.headers.insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::from_str(format!("{}", bytes.len()).as_str()).unwrap());
-                msg.headers.remove(TRANSFER_ENCODING);
-                self.encoder = Encoder::length(0);
-            }
-            Body::Streaming => {
-                if msg.chunked() {
-                    if version < Version::HTTP_11 {
-                        error!("Chunked transfer encoding is forbidden for {:?}", version);
-                    }
-                    msg.headers.remove(CONTENT_LENGTH);
-                    msg.headers.insert(TRANSFER_ENCODING, HeaderValue::from_static("chunked"));
-                    self.encoder = Encoder::chunked();
-                } else {
-                    self.encoder = Encoder::eof();
-                }
-            }
-            Body::Upgrade => {
-                msg.headers.insert(CONNECTION, HeaderValue::from_static("upgrade"));
-                self.encoder = Encoder::eof();
-            }
-        }
-
         // Connection upgrade
+        let version = msg.version().unwrap_or_else(|| req.version());
         if msg.upgrade() {
             msg.headers.insert(CONNECTION, HeaderValue::from_static("upgrade"));
         }
@@ -171,44 +123,54 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         }
 
         // render message
-        let init_cap = 100 + msg.headers.len() * AVERAGE_HEADER_SIZE + extra;
-        self.buffer.reserve(init_cap);
+        {
+            let buffer = self.encoder.get_mut();
+            if let Body::Binary(ref bytes) = *msg.body() {
+                buffer.reserve(100 + msg.headers.len() * AVERAGE_HEADER_SIZE + bytes.len());
+            } else {
+                buffer.reserve(100 + msg.headers.len() * AVERAGE_HEADER_SIZE);
+            }
 
             if version == Version::HTTP_11 && msg.status == StatusCode::OK {
-            self.buffer.extend(b"HTTP/1.1 200 OK\r\n");
+                buffer.extend(b"HTTP/1.1 200 OK\r\n");
             } else {
-            let _ = write!(self.buffer, "{:?} {}\r\n", version, msg.status);
+                let _ = write!(buffer, "{:?} {}\r\n", version, msg.status);
             }
             for (key, value) in &msg.headers {
                 let t: &[u8] = key.as_ref();
-            self.buffer.extend(t);
-            self.buffer.extend(b": ");
-            self.buffer.extend(value.as_ref());
-            self.buffer.extend(b"\r\n");
+                buffer.extend(t);
+                buffer.extend(b": ");
+                buffer.extend(value.as_ref());
+                buffer.extend(b"\r\n");
             }
 
             // using http::h1::date is quite a lot faster than generating
             // a unique Date header each time like req/s goes up about 10%
             if !msg.headers.contains_key(DATE) {
-            self.buffer.reserve(date::DATE_VALUE_LENGTH + 8);
-            self.buffer.extend(b"Date: ");
-            date::extend(&mut self.buffer);
-            self.buffer.extend(b"\r\n");
+                buffer.reserve(date::DATE_VALUE_LENGTH + 8);
+                buffer.extend(b"Date: ");
+                let mut bytes = [0u8; 29];
+                date::extend(&mut bytes[..]);
+                buffer.extend(&bytes);
+                buffer.extend(b"\r\n");
             }
 
             // default content-type
             if !msg.headers.contains_key(CONTENT_TYPE) {
-            self.buffer.extend(b"ContentType: application/octet-stream\r\n".as_ref());
+                buffer.extend(b"ContentType: application/octet-stream\r\n".as_ref());
             }
 
-        self.buffer.extend(b"\r\n");
+            // msg eof
+            buffer.extend(b"\r\n");
+        }
 
-        if let Body::Binary(ref bytes) = body {
-            self.buffer.extend_from_slice(bytes.as_ref());
+        if msg.body().is_binary() {
+            let body = msg.replace_body(Body::Empty);
+            if let Body::Binary(bytes) = body {
+                self.encoder.write(bytes.as_ref())?;
                 return Ok(WriterState::Done)
             }
-        msg.replace_body(body);
-
+        }
         Ok(WriterState::Done)
     }
 
@@ -216,14 +178,14 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         if !self.disconnected {
             if self.started {
                 // TODO: add warning, write after EOF
-                self.encoder.encode(&mut self.buffer, payload);
+                self.encoder.write(payload)?;
             } else {
-                // might be response for EXCEPT
-                self.buffer.extend_from_slice(payload)
+                // might be response to EXCEPT
+                self.encoder.get_mut().extend_from_slice(payload)
             }
         }
 
-        if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+        if self.encoder.len() > MAX_WRITE_BUFFER_SIZE {
             Ok(WriterState::Pause)
         } else {
             Ok(WriterState::Done)
@@ -231,11 +193,13 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
     }
 
     fn write_eof(&mut self) -> Result<WriterState, io::Error> {
-        if !self.encoder.encode_eof(&mut self.buffer) {
+        self.encoder.write_eof()?;
+
+        if !self.encoder.is_eof() {
             //debug!("last payload item, but it is not EOF ");
             Err(io::Error::new(io::ErrorKind::Other,
                                "Last payload item, but eof is not reached"))
-        } else if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+        } else if self.encoder.len() > MAX_WRITE_BUFFER_SIZE {
             Ok(WriterState::Pause)
         } else {
             Ok(WriterState::Done)
@@ -250,100 +214,3 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         }
     }
 }
-
-/// Encoders to handle different Transfer-Encodings.
-#[derive(Debug, Clone)]
-pub(crate) struct Encoder {
-    kind: Kind,
-}
-
-#[derive(Debug, PartialEq, Clone)]
-enum Kind {
-    /// An Encoder for when Transfer-Encoding includes `chunked`.
-    Chunked(bool),
-    /// An Encoder for when Content-Length is set.
-    ///
-    /// Enforces that the body is not longer than the Content-Length header.
-    Length(u64),
-    /// An Encoder for when Content-Length is not known.
-    ///
-    /// Appliction decides when to stop writing.
-    Eof,
-}
-
-impl Encoder {
-
-    pub fn eof() -> Encoder {
-        Encoder {
-            kind: Kind::Eof,
-        }
-    }
-
-    pub fn chunked() -> Encoder {
-        Encoder {
-            kind: Kind::Chunked(false),
-        }
-    }
-
-    pub fn length(len: u64) -> Encoder {
-        Encoder {
-            kind: Kind::Length(len),
-        }
-    }
-
-    /// Encode message. Return `EOF` state of encoder
-    pub fn encode(&mut self, dst: &mut BytesMut, msg: &[u8]) -> bool {
-        match self.kind {
-            Kind::Eof => {
-                dst.extend(msg);
-                msg.is_empty()
-            },
-            Kind::Chunked(ref mut eof) => {
-                if *eof {
-                    return true;
-                }
-
-                if msg.is_empty() {
-                    *eof = true;
-                    dst.extend(b"0\r\n\r\n");
-                } else {
-                    write!(dst, "{:X}\r\n", msg.len()).unwrap();
-                    dst.extend(msg);
-                    dst.extend(b"\r\n");
-                }
-                *eof
-            },
-            Kind::Length(ref mut remaining) => {
-                if msg.is_empty() {
-                    return *remaining == 0
-                }
-                let max = cmp::min(*remaining, msg.len() as u64);
-                trace!("sized write = {}", max);
-                dst.extend(msg[..max as usize].as_ref());
-
-                *remaining -= max as u64;
-                trace!("encoded {} bytes, remaining = {}", max, remaining);
-                *remaining == 0
-            },
-        }
-    }
-
-    /// Encode eof. Return `EOF` state of encoder
-    pub fn encode_eof(&mut self, dst: &mut BytesMut) -> bool {
-        match self.kind {
-            Kind::Eof => true,
-            Kind::Chunked(ref mut eof) => {
-                if *eof {
-                    return true;
-                }
-
-                *eof = true;
-                dst.extend(b"0\r\n\r\n");
-                true
-            },
-            Kind::Length(ref mut remaining) => {
-                *remaining == 0
-            },
-        }
-    }
-}

src/h2writer.rs

@@ -1,14 +1,14 @@
 use std::{io, cmp};
-use bytes::{Bytes, BytesMut};
+use bytes::Bytes;
 use futures::{Async, Poll};
 use http2::{Reason, SendStream};
 use http2::server::Respond;
 use http::{Version, HttpTryFrom, Response};
-use http::header::{HeaderValue, CONNECTION, CONTENT_TYPE,
-                   CONTENT_LENGTH, TRANSFER_ENCODING, DATE};
+use http::header::{HeaderValue, CONNECTION, CONTENT_TYPE, TRANSFER_ENCODING, DATE};
 
 use date;
 use body::Body;
+use encoding::PayloadEncoder;
 use httprequest::HttpRequest;
 use httpresponse::HttpResponse;
 use h1writer::{Writer, WriterState};
@@ -20,9 +20,8 @@ const MAX_WRITE_BUFFER_SIZE: usize = 65_536; // max buffer size 64k
 pub(crate) struct H2Writer {
     respond: Respond<Bytes>,
     stream: Option<SendStream<Bytes>>,
-    buffer: BytesMut,
     started: bool,
-    encoder: Encoder,
+    encoder: PayloadEncoder,
     disconnected: bool,
     eof: bool,
 }
@@ -33,9 +32,8 @@ impl H2Writer {
         H2Writer {
             respond: respond,
             stream: None,
-            buffer: BytesMut::new(),
             started: false,
-            encoder: Encoder::length(0),
+            encoder: PayloadEncoder::default(),
             disconnected: false,
             eof: true,
         }
@@ -53,7 +51,9 @@ impl H2Writer {
         }
 
         if let Some(ref mut stream) = self.stream {
-            if self.buffer.is_empty() {
+            let buffer = self.encoder.get_mut();
+
+            if buffer.is_empty() {
                 if self.eof {
                     let _ = stream.send_data(Bytes::new(), true);
                 }
@@ -63,7 +63,7 @@ impl H2Writer {
             loop {
                 match stream.poll_capacity() {
                     Ok(Async::NotReady) => {
-                        if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+                        if buffer.len() > MAX_WRITE_BUFFER_SIZE {
                             return Ok(WriterState::Pause)
                         } else {
                             return Ok(WriterState::Done)
@@ -73,14 +73,14 @@ impl H2Writer {
                         return Ok(WriterState::Done)
                     }
                     Ok(Async::Ready(Some(cap))) => {
-                        let len = self.buffer.len();
-                        let bytes = self.buffer.split_to(cmp::min(cap, len));
-                        let eof = self.buffer.is_empty() && self.eof;
+                        let len = buffer.len();
+                        let bytes = buffer.split_to(cmp::min(cap, len));
+                        let eof = buffer.is_empty() && self.eof;
 
                         if let Err(err) = stream.send_data(bytes.freeze(), eof) {
                             return Err(io::Error::new(io::ErrorKind::Other, err))
-                        } else if !self.buffer.is_empty() {
-                            let cap = cmp::min(self.buffer.len(), CHUNK_SIZE);
+                        } else if !buffer.is_empty() {
+                            let cap = cmp::min(buffer.len(), CHUNK_SIZE);
                             stream.reserve_capacity(cap);
                         } else {
                             return Ok(WriterState::Done)
@@ -98,57 +98,26 @@ impl H2Writer {
 
 impl Writer for H2Writer {
 
-    fn start(&mut self, _: &mut HttpRequest, msg: &mut HttpResponse)
+    fn start(&mut self, req: &mut HttpRequest, msg: &mut HttpResponse)
              -> Result<WriterState, io::Error>
     {
         trace!("Prepare message status={:?}", msg);
 
         // prepare response
         self.started = true;
-        let body = msg.replace_body(Body::Empty);
+        self.encoder = PayloadEncoder::new(req, msg);
+        self.eof = if let Body::Empty = *msg.body() { true } else { false };
 
         // http2 specific
         msg.headers.remove(CONNECTION);
         msg.headers.remove(TRANSFER_ENCODING);
 
-        match body {
-            Body::Empty => {
-                if msg.chunked() {
-                    error!("Chunked transfer is enabled but body is set to Empty");
-                }
-                msg.headers.insert(CONTENT_LENGTH, HeaderValue::from_static("0"));
-                self.encoder = Encoder::length(0);
-            },
-            Body::Length(n) => {
-                if msg.chunked() {
-                    error!("Chunked transfer is enabled but body with specific length is specified");
-                }
-                self.eof = false;
-                msg.headers.insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::from_str(format!("{}", n).as_str()).unwrap());
-                self.encoder = Encoder::length(n);
-            },
-            Body::Binary(ref bytes) => {
-                self.eof = false;
-                msg.headers.insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::from_str(format!("{}", bytes.len()).as_str()).unwrap());
-                self.encoder = Encoder::length(0);
-            }
-            _ => {
-                msg.headers.remove(CONTENT_LENGTH);
-                self.eof = false;
-                self.encoder = Encoder::eof();
-            }
-        }
-
         // using http::h1::date is quite a lot faster than generating
         // a unique Date header each time like req/s goes up about 10%
         if !msg.headers.contains_key(DATE) {
-            let mut bytes = BytesMut::with_capacity(29);
-            date::extend(&mut bytes);
-            msg.headers.insert(DATE, HeaderValue::try_from(bytes.freeze()).unwrap());
+            let mut bytes = [0u8; 29];
+            date::extend(&mut bytes[..]);
+            msg.headers.insert(DATE, HeaderValue::try_from(&bytes[..]).unwrap());
         }
 
         // default content-type
@@ -165,23 +134,22 @@ impl Writer for H2Writer {
         }
 
         match self.respond.send_response(resp, self.eof) {
-            Ok(stream) => {
-                self.stream = Some(stream);
-            }
-            Err(_) => {
-                return Err(io::Error::new(io::ErrorKind::Other, "err"))
-            }
+            Ok(stream) =>
+                self.stream = Some(stream),
+            Err(_) =>
+                return Err(io::Error::new(io::ErrorKind::Other, "err")),
         }
 
-        if let Body::Binary(ref bytes) = body {
+        if msg.body().is_binary() {
+            if let Body::Binary(bytes) = msg.replace_body(Body::Empty) {
                 self.eof = true;
-            self.buffer.extend_from_slice(bytes.as_ref());
+                self.encoder.write(bytes.as_ref())?;
                 if let Some(ref mut stream) = self.stream {
-                stream.reserve_capacity(cmp::min(self.buffer.len(), CHUNK_SIZE));
+                    stream.reserve_capacity(cmp::min(self.encoder.len(), CHUNK_SIZE));
                 }
                 return Ok(WriterState::Done)
             }
-        msg.replace_body(body);
+        }
 
         Ok(WriterState::Done)
     }
@@ -190,14 +158,14 @@ impl Writer for H2Writer {
         if !self.disconnected {
             if self.started {
                 // TODO: add warning, write after EOF
-                self.encoder.encode(&mut self.buffer, payload);
+                self.encoder.write(payload)?;
             } else {
                 // might be response for EXCEPT
-                self.buffer.extend_from_slice(payload)
+                self.encoder.get_mut().extend_from_slice(payload)
             }
         }
 
-        if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+        if self.encoder.len() > MAX_WRITE_BUFFER_SIZE {
             Ok(WriterState::Pause)
         } else {
             Ok(WriterState::Done)
@@ -205,11 +173,13 @@ impl Writer for H2Writer {
     }
 
     fn write_eof(&mut self) -> Result<WriterState, io::Error> {
+        self.encoder.write_eof()?;
+
         self.eof = true;
-        if !self.encoder.encode_eof(&mut self.buffer) {
+        if !self.encoder.is_eof() {
             Err(io::Error::new(io::ErrorKind::Other,
                                "Last payload item, but eof is not reached"))
-        } else if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
+        } else if self.encoder.len() > MAX_WRITE_BUFFER_SIZE {
             Ok(WriterState::Pause)
         } else {
             Ok(WriterState::Done)
@@ -224,67 +194,3 @@ impl Writer for H2Writer {
         }
     }
 }
-
-
-/// Encoders to handle different Transfer-Encodings.
-#[derive(Debug, Clone)]
-pub(crate) struct Encoder {
-    kind: Kind,
-}
-
-#[derive(Debug, PartialEq, Clone)]
-enum Kind {
-    /// An Encoder for when Content-Length is set.
-    ///
-    /// Enforces that the body is not longer than the Content-Length header.
-    Length(u64),
-    /// An Encoder for when Content-Length is not known.
-    ///
-    /// Appliction decides when to stop writing.
-    Eof,
-}
-
-impl Encoder {
-
-    pub fn eof() -> Encoder {
-        Encoder {
-            kind: Kind::Eof,
-        }
-    }
-
-    pub fn length(len: u64) -> Encoder {
-        Encoder {
-            kind: Kind::Length(len),
-        }
-    }
-
-    /// Encode message. Return `EOF` state of encoder
-    pub fn encode(&mut self, dst: &mut BytesMut, msg: &[u8]) -> bool {
-        match self.kind {
-            Kind::Eof => {
-                dst.extend(msg);
-                msg.is_empty()
-            },
-            Kind::Length(ref mut remaining) => {
-                if msg.is_empty() {
-                    return *remaining == 0
-                }
-                let max = cmp::min(*remaining, msg.len() as u64);
-                trace!("sized write = {}", max);
-                dst.extend(msg[..max as usize].as_ref());
-
-                *remaining -= max as u64;
-                trace!("encoded {} bytes, remaining = {}", max, remaining);
-                *remaining == 0
-            },
-        }
-    }
-
-    /// Encode eof. Return `EOF` state of encoder
-    pub fn encode_eof(&mut self, _dst: &mut BytesMut) -> bool {
-        match self.kind {
-            Kind::Eof => true,
-            Kind::Length(ref mut remaining) => *remaining == 0
-        }
-    }
-}

tests/test_server.rs

@@ -47,7 +47,6 @@ fn test_serve_incoming() {
         let tcp = TcpListener::from_listener(tcp, &addr2, Arbiter::handle()).unwrap();
         srv.serve_incoming::<_, ()>(tcp.incoming()).unwrap();
         sys.run();
-
     });
 
     assert!(reqwest::get(&format!("http://{}/", addr1))