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refactor streaming responses

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This commit is contained in:
Nikolay Kim 2017-11-30 14:42:20 -08:00
parent a0bca2d4cf
commit 6e138bf373
14 changed files with 436 additions and 295 deletions
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2
CHANGES.md
View file

@ -5,6 +5,8 @@
* HTTP/2 Support
* Refactor streaming responses
* Refactor error handling
* Asynchronous middlewares

15
examples/basic.rs
View file

@ -8,7 +8,7 @@ extern crate futures;
use actix_web::*;
use actix_web::middlewares::RequestSession;
use futures::stream::{once, Once};
use futures::future::{FutureResult, result};
/// simple handler
fn index(mut req: HttpRequest) -> Result<HttpResponse> {
@ -31,15 +31,14 @@ fn index(mut req: HttpRequest) -> Result<HttpResponse> {
}
/// async handler
fn index_async(req: HttpRequest) -> Once<actix_web::Frame, Error>
fn index_async(req: HttpRequest) -> FutureResult<HttpResponse, Error>
{
println!("{:?}", req);
once(Ok(HttpResponse::Ok()
.content_type("text/html")
.body(format!("Hello {}!", req.match_info().get("name").unwrap()))
.unwrap()
.into()))
result(HttpResponse::Ok()
.content_type("text/html")
.body(format!("Hello {}!", req.match_info().get("name").unwrap()))
.map_err(|e| e.into()))
}
/// handler with path parameters like `/user/{name}/`
@ -69,7 +68,7 @@ fn main() {
))
// register simple handle r, handle all methods
.handler("/index.html", index)
// with path parameters
// with path parameters
.resource("/user/{name}/", |r| r.handler(Method::GET, with_param))
// async handler
.resource("/async/{name}", |r| r.async(Method::GET, index_async))

2
examples/websocket.rs
View file

@ -56,7 +56,7 @@ impl Handler<ws::Message> for MyWebSocket {
}
fn main() {
::std::env::set_var("RUST_LOG", "actix_web=info");
::std::env::set_var("RUST_LOG", "actix_web=trace");
let _ = env_logger::init();
let sys = actix::System::new("ws-example");

4
guide/src/qs_3.md
View file

@ -1,4 +1,4 @@
# Overview
# [WIP] Overview
Actix web provides some primitives to build web servers and applications with Rust.
It provides routing, middlewares, pre-processing of requests, and post-processing of responses,
@ -69,7 +69,7 @@ fn main() {
}
```
## Handler
## [WIP] Handler
A request handler can have different forms.

66
src/body.rs
View file

@ -1,24 +1,29 @@
use std::fmt;
use std::rc::Rc;
use std::sync::Arc;
use bytes::{Bytes, BytesMut};
use futures::Stream;
use route::Frame;
use error::Error;
pub(crate) type BodyStream = Box<Stream<Item=Bytes, Error=Error>>;
/// Represents various types of http message body.
#[derive(Debug, PartialEq)]
pub enum Body {
/// Empty response. `Content-Length` header is set to `0`
Empty,
/// Specific response body.
Binary(Binary),
/// Streaming response body with specified length.
Length(u64),
/// Unspecified streaming response. Developer is responsible for setting
/// right `Content-Length` or `Transfer-Encoding` headers.
Streaming,
Streaming(BodyStream),
/// Upgrade connection.
Upgrade,
Upgrade(BodyStream),
/// Special body type for actor streaming response.
StreamingContext,
/// Special body type for actor upgrade response.
UpgradeContext,
}
/// Represents various types of binary body.
@ -45,7 +50,8 @@ impl Body {
/// Does this body streaming.
pub fn is_streaming(&self) -> bool {
match *self {
Body::Length(_) | Body::Streaming | Body::Upgrade => true,
Body::Streaming(_) | Body::StreamingContext
| Body::Upgrade(_) | Body::UpgradeContext => true,
_ => false
}
}
@ -64,6 +70,43 @@ impl Body {
}
}
impl PartialEq for Body {
fn eq(&self, other: &Body) -> bool {
match *self {
Body::Empty => match *other {
Body::Empty => true,
_ => false,
},
Body::Binary(ref b) => match *other {
Body::Binary(ref b2) => b == b2,
_ => false,
},
Body::StreamingContext => match *other {
Body::StreamingContext => true,
_ => false,
},
Body::UpgradeContext => match *other {
Body::UpgradeContext => true,
_ => false,
},
Body::Streaming(_) | Body::Upgrade(_) => false,
}
}
}
impl fmt::Debug for Body {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Body::Empty => write!(f, "Body::Empty"),
Body::Binary(ref b) => write!(f, "Body::Binary({:?})", b),
Body::Streaming(_) => write!(f, "Body::Streaming(_)"),
Body::Upgrade(_) => write!(f, "Body::Upgrade(_)"),
Body::StreamingContext => write!(f, "Body::StreamingContext"),
Body::UpgradeContext => write!(f, "Body::UpgradeContext"),
}
}
}
impl<T> From<T> for Body where T: Into<Binary>{
fn from(b: T) -> Body {
Body::Binary(b.into())
@ -195,12 +238,6 @@ impl AsRef<[u8]> for Binary {
}
}
impl From<Binary> for Frame {
fn from(b: Binary) -> Frame {
Frame::Payload(Some(b))
}
}
#[cfg(test)]
mod tests {
use super::*;
@ -209,8 +246,7 @@ mod tests {
fn test_body_is_streaming() {
assert_eq!(Body::Empty.is_streaming(), false);
assert_eq!(Body::Binary(Binary::from("")).is_streaming(), false);
assert_eq!(Body::Length(100).is_streaming(), true);
assert_eq!(Body::Streaming.is_streaming(), true);
// assert_eq!(Body::Streaming.is_streaming(), true);
}
#[test]

63
src/context.rs
View file

@ -3,7 +3,7 @@ use std::rc::Rc;
use std::cell::RefCell;
use std::collections::VecDeque;
use std::marker::PhantomData;
use futures::{Async, Future, Stream, Poll};
use futures::{Async, Future, Poll};
use futures::sync::oneshot::Sender;
use actix::{Actor, ActorState, ActorContext, AsyncContext,
@ -13,13 +13,19 @@ use actix::dev::{AsyncContextApi, ActorAddressCell, ActorItemsCell, ActorWaitCel
Envelope, ToEnvelope, RemoteEnvelope};
use task::{IoContext, DrainFut};
use body::Binary;
use body::{Body, Binary};
use error::Error;
use route::Frame;
use httprequest::HttpRequest;
use httpresponse::HttpResponse;
#[derive(Debug)]
pub(crate) enum Frame {
Message(HttpResponse),
Payload(Option<Binary>),
Drain(Rc<RefCell<DrainFut>>),
}
/// Http actor execution context
pub struct HttpContext<A, S=()> where A: Actor<Context=HttpContext<A, S>>,
{
@ -31,25 +37,14 @@ pub struct HttpContext<A, S=()> where A: Actor<Context=HttpContext<A, S>>,
stream: VecDeque<Frame>,
wait: ActorWaitCell<A>,
request: HttpRequest<S>,
streaming: bool,
disconnected: bool,
}
impl<A, S> IoContext for HttpContext<A, S> where A: Actor<Context=Self>, S: 'static {
fn disconnected(&mut self) {
self.items.stop();
self.disconnected = true;
if self.state == ActorState::Running {
self.state = ActorState::Stopping;
}
}
}
impl<A, S> ActorContext for HttpContext<A, S> where A: Actor<Context=Self>
{
/// Stop actor execution
fn stop(&mut self) {
self.stream.push_back(Frame::Payload(None));
self.items.stop();
self.address.close();
if self.state == ActorState::Running {
@ -116,6 +111,7 @@ impl<A, S> HttpContext<A, S> where A: Actor<Context=Self> {
wait: ActorWaitCell::default(),
stream: VecDeque::new(),
request: req,
streaming: false,
disconnected: false,
}
}
@ -133,20 +129,25 @@ impl<A, S> HttpContext<A, S> where A: Actor<Context=Self> {
&mut self.request
}
/// Start response processing
/// Send response to peer
pub fn start<R: Into<HttpResponse>>(&mut self, response: R) {
self.stream.push_back(Frame::Message(response.into()))
let resp = response.into();
match *resp.body() {
Body::StreamingContext | Body::UpgradeContext => self.streaming = true,
_ => (),
}
self.stream.push_back(Frame::Message(resp))
}
/// Write payload
pub fn write<B: Into<Binary>>(&mut self, data: B) {
self.stream.push_back(Frame::Payload(Some(data.into())))
}
/// Indicate end of streamimng payload. Also this method calls `Self::close`.
pub fn write_eof(&mut self) {
self.stop();
if self.streaming {
if !self.disconnected {
self.stream.push_back(Frame::Payload(Some(data.into())))
}
} else {
warn!("Trying to write response body for non-streaming response");
}
}
/// Returns drain future
@ -184,11 +185,15 @@ impl<A, S> HttpContext<A, S> where A: Actor<Context=Self> {
}
}
#[doc(hidden)]
impl<A, S> Stream for HttpContext<A, S> where A: Actor<Context=Self>
{
type Item = Frame;
type Error = Error;
impl<A, S> IoContext for HttpContext<A, S> where A: Actor<Context=Self>, S: 'static {
fn disconnected(&mut self) {
self.items.stop();
self.disconnected = true;
if self.state == ActorState::Running {
self.state = ActorState::Stopping;
}
}
fn poll(&mut self) -> Poll<Option<Frame>, Error> {
let act: &mut A = unsafe {

38
src/encoding.rs
View file

@ -381,28 +381,6 @@ impl PayloadEncoder {
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 mut bytes) => {
if compression {
let transfer = TransferEncoding::eof();
@ -435,7 +413,7 @@ impl PayloadEncoder {
TransferEncoding::length(bytes.len() as u64)
}
}
Body::Streaming => {
Body::Streaming(_) | Body::StreamingContext => {
if resp.chunked() {
resp.headers.remove(CONTENT_LENGTH);
if version != Version::HTTP_11 {
@ -449,11 +427,23 @@ impl PayloadEncoder {
TRANSFER_ENCODING, HeaderValue::from_static("chunked"));
TransferEncoding::chunked()
}
} else if let Some(len) = resp.headers().get(CONTENT_LENGTH) {
// Content-Length
if let Ok(s) = len.to_str() {
if let Ok(len) = s.parse::<u64>() {
TransferEncoding::length(len)
} else {
debug!("illegal Content-Length: {:?}", len);
TransferEncoding::eof()
}
} else {
TransferEncoding::eof()
}
} else {
TransferEncoding::eof()
}
}
Body::Upgrade => {
Body::Upgrade(_) | Body::UpgradeContext => {
if version == Version::HTTP_2 {
error!("Connection upgrade is forbidden for HTTP/2");
} else {

14
src/httpresponse.rs
View file

@ -11,7 +11,6 @@ use serde::Serialize;
use Cookie;
use body::Body;
use route::Frame;
use error::Error;
use encoding::ContentEncoding;
@ -223,13 +222,6 @@ impl fmt::Debug for HttpResponse {
}
}
// TODO: remove
impl From<HttpResponse> for Frame {
fn from(resp: HttpResponse) -> Frame {
Frame::Message(resp)
}
}
#[derive(Debug)]
struct Parts {
version: Option<Version>,
@ -535,12 +527,6 @@ mod tests {
assert_eq!(resp.status(), StatusCode::NO_CONTENT)
}
#[test]
fn test_body() {
assert!(Body::Length(10).is_streaming());
assert!(Body::Streaming.is_streaming());
}
#[test]
fn test_upgrade() {
let resp = HttpResponse::build(StatusCode::OK)

2
src/lib.rs
View file

@ -82,7 +82,7 @@ pub use application::Application;
pub use httprequest::{HttpRequest, UrlEncoded};
pub use httpresponse::HttpResponse;
pub use payload::{Payload, PayloadItem};
pub use route::{Frame, Reply};
pub use route::Reply;
pub use resource::Resource;
pub use recognizer::Params;
pub use server::HttpServer;

8
src/pipeline.rs
View file

@ -391,11 +391,7 @@ impl MiddlewaresResponse {
}
}
pub fn poll(&mut self, req: &mut HttpRequest) -> Poll<Option<HttpResponse>, Error> {
if self.fut.is_none() {
return Ok(Async::Ready(None))
}
pub fn poll(&mut self, req: &mut HttpRequest) -> Poll<HttpResponse, Error> {
loop {
// poll latest fut
let mut resp = match self.fut.as_mut().unwrap().poll() {
@ -410,7 +406,7 @@ impl MiddlewaresResponse {
loop {
if self.idx == 0 {
return Ok(Async::Ready(Some(resp)))
return Ok(Async::Ready(resp))
} else {
match self.middlewares[self.idx].response(req, resp) {
Response::Err(err) =>

7
src/resource.rs
View file

@ -2,12 +2,13 @@ use std::marker::PhantomData;
use std::collections::HashMap;
use http::Method;
use futures::Stream;
use futures::Future;
use task::Task;
use error::Error;
use route::{Reply, RouteHandler, Frame, WrapHandler, Handler, StreamHandler};
use route::{Reply, RouteHandler, WrapHandler, Handler, StreamHandler};
use httprequest::HttpRequest;
use httpresponse::HttpResponse;
use httpcodes::{HTTPNotFound, HTTPMethodNotAllowed};
/// Http resource
@ -68,7 +69,7 @@ impl<S> Resource<S> where S: 'static {
/// Register async handler for specified method.
pub fn async<F, R>(&mut self, method: Method, handler: F)
where F: Fn(HttpRequest<S>) -> R + 'static,
R: Stream<Item=Frame, Error=Error> + 'static,
R: Future<Item=HttpResponse, Error=Error> + 'static,
{
self.routes.insert(method, Box::new(StreamHandler::new(handler)));
}

43
src/route.rs
View file

@ -1,31 +1,14 @@
use std::rc::Rc;
use std::cell::RefCell;
use std::marker::PhantomData;
use std::result::Result as StdResult;
use actix::Actor;
use futures::Stream;
use futures::Future;
use body::Binary;
use error::Error;
use context::HttpContext;
use httprequest::HttpRequest;
use httpresponse::HttpResponse;
use task::{Task, DrainFut, IoContext};
#[doc(hidden)]
#[derive(Debug)]
pub enum Frame {
Message(HttpResponse),
Payload(Option<Binary>),
Drain(Rc<RefCell<DrainFut>>),
}
impl Frame {
pub fn eof() -> Frame {
Frame::Payload(None)
}
}
use task::{Task, IoContext};
/// Trait defines object that could be regestered as route handler
#[allow(unused_variables)]
@ -55,8 +38,8 @@ pub struct Reply(ReplyItem);
enum ReplyItem {
Message(HttpResponse),
Actor(Box<IoContext<Item=Frame, Error=Error>>),
Stream(Box<Stream<Item=Frame, Error=Error>>),
Actor(Box<IoContext>),
Future(Box<Future<Item=HttpResponse, Error=Error>>),
}
impl Reply {
@ -69,10 +52,10 @@ impl Reply {
}
/// Create async response
pub fn stream<S>(stream: S) -> Reply
where S: Stream<Item=Frame, Error=Error> + 'static
pub fn async<F>(fut: F) -> Reply
where F: Future<Item=HttpResponse, Error=Error> + 'static
{
Reply(ReplyItem::Stream(Box::new(stream)))
Reply(ReplyItem::Future(Box::new(fut)))
}
/// Send response
@ -89,8 +72,8 @@ impl Reply {
ReplyItem::Actor(ctx) => {
task.context(ctx)
}
ReplyItem::Stream(stream) => {
task.stream(stream)
ReplyItem::Future(fut) => {
task.async(fut)
}
}
}
@ -160,7 +143,7 @@ impl<S, H, R> RouteHandler<S> for WrapHandler<S, H, R>
pub(crate)
struct StreamHandler<S, R, F>
where F: Fn(HttpRequest<S>) -> R + 'static,
R: Stream<Item=Frame, Error=Error> + 'static,
R: Future<Item=HttpResponse, Error=Error> + 'static,
S: 'static,
{
f: Box<F>,
@ -169,7 +152,7 @@ struct StreamHandler<S, R, F>
impl<S, R, F> StreamHandler<S, R, F>
where F: Fn(HttpRequest<S>) -> R + 'static,
R: Stream<Item=Frame, Error=Error> + 'static,
R: Future<Item=HttpResponse, Error=Error> + 'static,
S: 'static,
{
pub fn new(f: F) -> Self {
@ -179,10 +162,10 @@ impl<S, R, F> StreamHandler<S, R, F>
impl<S, R, F> RouteHandler<S> for StreamHandler<S, R, F>
where F: Fn(HttpRequest<S>) -> R + 'static,
R: Stream<Item=Frame, Error=Error> + 'static,
R: Future<Item=HttpResponse, Error=Error> + 'static,
S: 'static,
{
fn handle(&self, req: HttpRequest<S>, task: &mut Task) {
task.stream((self.f)(req))
task.async((self.f)(req))
}
}

465
src/task.rs
View file

@ -1,20 +1,18 @@
use std::mem;
use std::{fmt, mem};
use std::rc::Rc;
use std::cell::RefCell;
use std::collections::VecDeque;
use futures::{Async, Future, Poll, Stream};
use futures::{Async, Future, Poll};
use futures::task::{Task as FutureTask, current as current_task};
use body::{Body, BodyStream, Binary};
use context::Frame;
use h1writer::{Writer, WriterState};
use error::{Error, UnexpectedTaskFrame};
use route::Frame;
use pipeline::MiddlewaresResponse;
use httprequest::HttpRequest;
use httpresponse::HttpResponse;
type FrameStream = Stream<Item=Frame, Error=Error>;
#[derive(PartialEq, Debug)]
enum TaskRunningState {
Paused,
@ -38,27 +36,69 @@ impl TaskRunningState {
}
}
#[derive(PartialEq, Debug)]
enum TaskIOState {
ReadingMessage,
ReadingPayload,
Done,
enum ResponseState {
Reading,
Ready(HttpResponse),
Middlewares(MiddlewaresResponse),
Prepared(Option<HttpResponse>),
}
impl TaskIOState {
fn is_done(&self) -> bool {
*self == TaskIOState::Done
}
enum IOState {
Response,
Payload(BodyStream),
Context,
Done,
}
enum TaskStream {
None,
Stream(Box<FrameStream>),
Context(Box<IoContext<Item=Frame, Error=Error>>),
Context(Box<IoContext>),
Response(Box<Future<Item=HttpResponse, Error=Error>>),
}
pub(crate) trait IoContext: Stream<Item=Frame, Error=Error> + 'static {
impl IOState {
fn is_done(&self) -> bool {
match *self {
IOState::Done => true,
_ => false
}
}
}
impl ResponseState {
fn is_reading(&self) -> bool {
match *self {
ResponseState::Reading => true,
_ => false
}
}
}
impl fmt::Debug for ResponseState {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ResponseState::Reading => write!(f, "ResponseState::Reading"),
ResponseState::Ready(_) => write!(f, "ResponseState::Ready"),
ResponseState::Middlewares(_) => write!(f, "ResponseState::Middlewares"),
ResponseState::Prepared(_) => write!(f, "ResponseState::Prepared"),
}
}
}
impl fmt::Debug for IOState {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
IOState::Response => write!(f, "IOState::Response"),
IOState::Payload(_) => write!(f, "IOState::Payload"),
IOState::Context => write!(f, "IOState::Context"),
IOState::Done => write!(f, "IOState::Done"),
}
}
}
pub(crate) trait IoContext: 'static {
fn disconnected(&mut self);
fn poll(&mut self) -> Poll<Option<Frame>, Error>;
}
/// Future that resolves when all buffered data get sent
@ -104,12 +144,11 @@ impl Future for DrainFut {
}
pub struct Task {
state: TaskRunningState,
iostate: TaskIOState,
frames: VecDeque<Frame>,
running: TaskRunningState,
response: ResponseState,
iostate: IOState,
stream: TaskStream,
drain: Vec<Rc<RefCell<DrainFut>>>,
prepared: Option<HttpResponse>,
disconnected: bool,
middlewares: Option<MiddlewaresResponse>,
}
@ -118,12 +157,11 @@ pub struct Task {
impl Default for Task {
fn default() -> Task {
Task { state: TaskRunningState::Running,
iostate: TaskIOState::ReadingMessage,
frames: VecDeque::new(),
Task { running: TaskRunningState::Running,
response: ResponseState::Reading,
iostate: IOState::Response,
drain: Vec::new(),
stream: TaskStream::None,
prepared: None,
disconnected: false,
middlewares: None }
}
@ -132,16 +170,11 @@ impl Default for Task {
impl Task {
pub(crate) fn from_response<R: Into<HttpResponse>>(response: R) -> Task {
let mut frames = VecDeque::new();
frames.push_back(Frame::Message(response.into()));
frames.push_back(Frame::Payload(None));
Task { state: TaskRunningState::Running,
iostate: TaskIOState::Done,
frames: frames,
Task { running: TaskRunningState::Running,
response: ResponseState::Ready(response.into()),
iostate: IOState::Response,
drain: Vec::new(),
stream: TaskStream::None,
prepared: None,
disconnected: false,
middlewares: None }
}
@ -151,27 +184,33 @@ impl Task {
}
pub fn reply<R: Into<HttpResponse>>(&mut self, response: R) {
self.frames.push_back(Frame::Message(response.into()));
self.frames.push_back(Frame::Payload(None));
self.iostate = TaskIOState::Done;
let state = &mut self.response;
match *state {
ResponseState::Reading =>
*state = ResponseState::Ready(response.into()),
_ => panic!("Internal task state is broken"),
}
}
pub fn error<E: Into<Error>>(&mut self, err: E) {
self.reply(err.into())
}
pub(crate) fn context(&mut self, ctx: Box<IoContext<Item=Frame, Error=Error>>) {
pub(crate) fn context(&mut self, ctx: Box<IoContext>) {
self.stream = TaskStream::Context(ctx);
}
pub fn stream<S>(&mut self, stream: S)
where S: Stream<Item=Frame, Error=Error> + 'static
pub fn async<F>(&mut self, fut: F)
where F: Future<Item=HttpResponse, Error=Error> + 'static
{
self.stream = TaskStream::Stream(Box::new(stream));
self.stream = TaskStream::Response(Box::new(fut));
}
pub(crate) fn response(&mut self) -> HttpResponse {
self.prepared.take().unwrap()
match self.response {
ResponseState::Prepared(ref mut state) => state.take().unwrap(),
_ => panic!("Internal state is broken"),
}
}
pub(crate) fn set_middlewares(&mut self, middlewares: MiddlewaresResponse) {
@ -188,97 +227,112 @@ impl Task {
pub(crate) fn poll_io<T>(&mut self, io: &mut T, req: &mut HttpRequest) -> Poll<bool, Error>
where T: Writer
{
trace!("POLL-IO frames:{:?}", self.frames.len());
// response is completed
if self.frames.is_empty() && self.iostate.is_done() {
return Ok(Async::Ready(self.state.is_done()));
} else if self.drain.is_empty() {
// poll stream
if self.state == TaskRunningState::Running {
match self.poll()? {
Async::Ready(_) =>
self.state = TaskRunningState::Done,
Async::NotReady => (),
}
}
// process middlewares response
if let Some(mut middlewares) = self.middlewares.take() {
match middlewares.poll(req)? {
Async::NotReady => {
self.middlewares = Some(middlewares);
return Ok(Async::NotReady);
}
Async::Ready(None) => {
self.middlewares = Some(middlewares);
}
Async::Ready(Some(mut response)) => {
let result = io.start(req, &mut response)?;
self.prepared = Some(response);
match result {
WriterState::Pause => self.state.pause(),
WriterState::Done => self.state.resume(),
}
},
}
}
trace!("POLL-IO frames resp: {:?}, io: {:?}, running: {:?}",
self.response, self.iostate, self.running);
if self.iostate.is_done() { // response is completed
return Ok(Async::Ready(self.running.is_done()));
} else if self.drain.is_empty() && self.running != TaskRunningState::Paused {
// if task is paused, write buffer is probably full
if self.state != TaskRunningState::Paused {
// process exiting frames
while let Some(frame) = self.frames.pop_front() {
trace!("IO Frame: {:?}", frame);
let res = match frame {
Frame::Message(mut resp) => {
// run middlewares
if let Some(mut middlewares) = self.middlewares.take() {
match middlewares.response(req, resp) {
Ok(Some(mut resp)) => {
let result = io.start(req, &mut resp)?;
self.prepared = Some(resp);
result
}
Ok(None) => {
// middlewares need to run some futures
self.middlewares = Some(middlewares);
return self.poll_io(io, req)
}
Err(err) => return Err(err),
}
} else {
loop {
let result = match mem::replace(&mut self.iostate, IOState::Done) {
IOState::Response => {
match self.poll_response(req) {
Ok(Async::Ready(mut resp)) => {
let result = io.start(req, &mut resp)?;
self.prepared = Some(resp);
match resp.replace_body(Body::Empty) {
Body::Streaming(stream) | Body::Upgrade(stream) =>
self.iostate = IOState::Payload(stream),
Body::StreamingContext | Body::UpgradeContext =>
self.iostate = IOState::Context,
_ => (),
}
self.response = ResponseState::Prepared(Some(resp));
result
},
Ok(Async::NotReady) => {
self.iostate = IOState::Response;
return Ok(Async::NotReady)
}
Err(err) => {
let mut resp = err.into();
let result = io.start(req, &mut resp)?;
match resp.replace_body(Body::Empty) {
Body::Streaming(stream) | Body::Upgrade(stream) =>
self.iostate = IOState::Payload(stream),
_ => (),
}
self.response = ResponseState::Prepared(Some(resp));
result
}
}
Frame::Payload(Some(chunk)) => {
io.write(chunk.as_ref())?
},
Frame::Payload(None) => {
self.iostate = TaskIOState::Done;
io.write_eof()?
},
Frame::Drain(fut) => {
self.drain.push(fut);
break
},
IOState::Payload(mut body) => {
// always poll stream
if self.running == TaskRunningState::Running {
match self.poll()? {
Async::Ready(_) =>
self.running = TaskRunningState::Done,
Async::NotReady => (),
}
}
};
match res {
WriterState::Pause => {
self.state.pause();
break
match body.poll() {
Ok(Async::Ready(None)) => {
self.iostate = IOState::Done;
io.write_eof()?;
break
},
Ok(Async::Ready(Some(chunk))) => {
self.iostate = IOState::Payload(body);
io.write(chunk.as_ref())?
}
Ok(Async::NotReady) => {
self.iostate = IOState::Payload(body);
break
},
Err(err) => return Err(err),
}
WriterState::Done => self.state.resume(),
}
IOState::Context => {
match self.poll_context() {
Ok(Async::Ready(None)) => {
self.iostate = IOState::Done;
self.running = TaskRunningState::Done;
io.write_eof()?;
break
},
Ok(Async::Ready(Some(chunk))) => {
self.iostate = IOState::Context;
io.write(chunk.as_ref())?
}
Ok(Async::NotReady) => {
self.iostate = IOState::Context;
break
}
Err(err) => return Err(err),
}
}
IOState::Done => break,
};
match result {
WriterState::Pause => {
self.running.pause();
break
}
WriterState::Done =>
self.running.resume(),
}
}
}
// flush io
match io.poll_complete() {
Ok(Async::Ready(_)) => self.state.resume(),
Ok(Async::Ready(_)) => self.running.resume(),
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(err) => {
debug!("Error sending data: {}", err);
@ -296,65 +350,154 @@ impl Task {
// response is completed
if self.iostate.is_done() {
if let Some(ref mut resp) = self.prepared {
resp.set_response_size(io.written());
if let ResponseState::Prepared(Some(ref mut resp)) = self.response {
resp.set_response_size(io.written())
}
Ok(Async::Ready(self.state.is_done()))
Ok(Async::Ready(self.running.is_done()))
} else {
Ok(Async::NotReady)
}
}
fn poll_stream<S>(&mut self, stream: &mut S) -> Poll<(), Error>
where S: Stream<Item=Frame, Error=Error>
{
pub(crate) fn poll_response(&mut self, req: &mut HttpRequest) -> Poll<HttpResponse, Error> {
loop {
match stream.poll() {
Ok(Async::Ready(Some(frame))) => {
match frame {
Frame::Message(ref msg) => {
if self.iostate != TaskIOState::ReadingMessage {
error!("Unexpected frame {:?}", frame);
return Err(UnexpectedTaskFrame.into())
let state = mem::replace(&mut self.response, ResponseState::Prepared(None));
match state {
ResponseState::Ready(response) => {
// run middlewares
if let Some(mut middlewares) = self.middlewares.take() {
match middlewares.response(req, response) {
Ok(Some(response)) =>
return Ok(Async::Ready(response)),
Ok(None) => {
// middlewares need to run some futures
self.response = ResponseState::Middlewares(middlewares);
continue
}
let upgrade = msg.upgrade();
if upgrade || msg.body().is_streaming() {
self.iostate = TaskIOState::ReadingPayload;
} else {
self.iostate = TaskIOState::Done;
}
},
Frame::Payload(ref chunk) => {
if chunk.is_none() {
self.iostate = TaskIOState::Done;
} else if self.iostate != TaskIOState::ReadingPayload {
error!("Unexpected frame {:?}", self.iostate);
return Err(UnexpectedTaskFrame.into())
}
},
_ => (),
Err(err) => return Err(err),
}
} else {
return Ok(Async::Ready(response))
}
self.frames.push_back(frame)
},
Ok(Async::Ready(None)) =>
return Ok(Async::Ready(())),
Ok(Async::NotReady) =>
}
ResponseState::Middlewares(mut middlewares) => {
// process middlewares
match middlewares.poll(req) {
Ok(Async::NotReady) => {
self.response = ResponseState::Middlewares(middlewares);
return Ok(Async::NotReady)
},
Ok(Async::Ready(response)) =>
return Ok(Async::Ready(response)),
Err(err) =>
return Err(err),
}
}
_ => (),
}
self.response = state;
match mem::replace(&mut self.stream, TaskStream::None) {
TaskStream::None =>
return Ok(Async::NotReady),
Err(err) =>
return Err(err),
TaskStream::Context(mut context) => {
loop {
match context.poll() {
Ok(Async::Ready(Some(frame))) => {
match frame {
Frame::Message(msg) => {
if !self.response.is_reading() {
error!("Unexpected message frame {:?}", msg);
return Err(UnexpectedTaskFrame.into())
}
self.stream = TaskStream::Context(context);
self.response = ResponseState::Ready(msg);
break
},
Frame::Payload(_) => (),
Frame::Drain(fut) => {
self.drain.push(fut);
self.stream = TaskStream::Context(context);
break
}
}
},
Ok(Async::Ready(None)) => {
error!("Unexpected eof");
return Err(UnexpectedTaskFrame.into())
},
Ok(Async::NotReady) => {
self.stream = TaskStream::Context(context);
return Ok(Async::NotReady)
},
Err(err) =>
return Err(err),
}
}
},
TaskStream::Response(mut fut) => {
match fut.poll() {
Ok(Async::NotReady) => {
self.stream = TaskStream::Response(fut);
return Ok(Async::NotReady);
},
Ok(Async::Ready(response)) => {
self.response = ResponseState::Ready(response);
}
Err(err) =>
return Err(err)
}
}
}
}
}
pub(crate) fn poll(&mut self) -> Poll<(), Error> {
let mut s = mem::replace(&mut self.stream, TaskStream::None);
match self.stream {
TaskStream::None | TaskStream::Response(_) =>
Ok(Async::Ready(())),
TaskStream::Context(ref mut context) => {
loop {
match context.poll() {
Ok(Async::Ready(Some(_))) => (),
Ok(Async::Ready(None)) =>
return Ok(Async::Ready(())),
Ok(Async::NotReady) =>
return Ok(Async::NotReady),
Err(err) =>
return Err(err),
}
}
},
}
}
let result = match s {
TaskStream::None => Ok(Async::Ready(())),
TaskStream::Stream(ref mut stream) => self.poll_stream(stream),
TaskStream::Context(ref mut context) => self.poll_stream(context),
};
self.stream = s;
result
fn poll_context(&mut self) -> Poll<Option<Binary>, Error> {
match self.stream {
TaskStream::None | TaskStream::Response(_) =>
Err(UnexpectedTaskFrame.into()),
TaskStream::Context(ref mut context) => {
match context.poll() {
Ok(Async::Ready(Some(frame))) => {
match frame {
Frame::Message(msg) => {
error!("Unexpected message frame {:?}", msg);
Err(UnexpectedTaskFrame.into())
},
Frame::Payload(payload) => {
Ok(Async::Ready(payload))
},
Frame::Drain(fut) => {
self.drain.push(fut);
Ok(Async::NotReady)
}
}
},
Ok(Async::Ready(None)) => Ok(Async::Ready(None)),
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(err) => Err(err),
}
},
}
}
}

2
src/ws.rs
View file

@ -169,7 +169,7 @@ pub fn handshake<S>(req: &HttpRequest<S>) -> Result<HttpResponse, WsHandshakeErr
.header(header::UPGRADE, "websocket")
.header(header::TRANSFER_ENCODING, "chunked")
.header(SEC_WEBSOCKET_ACCEPT, key.as_str())
.body(Body::Upgrade).unwrap()
.body(Body::UpgradeContext).unwrap()
)
}