refactor middlewares

CHANGES.md

@@ -5,6 +5,8 @@
 
 * HTTP/2 Support
 
+* Asynchronous middlewares
+
 * Content compression/decompression (br, gzip, deflate)
 
 

examples/basic.rs

@@ -49,7 +49,7 @@ fn main() {
     HttpServer::new(
         Application::default("/")
             // enable logger
-            .middleware(Logger::new(None))
+            .middleware(middlewares::Logger::new(None))
             // register simple handle r, handle all methods
             .handler("/index.html", index)
             // with path parameters

examples/state.rs

@@ -74,7 +74,7 @@ fn main() {
     HttpServer::new(
         Application::builder("/", AppState{counter: Cell::new(0)})
             // enable logger
-            .middleware(Logger::new(None))
+            .middleware(middlewares::Logger::new(None))
             // websocket route
             .resource("/ws/", |r| r.get::<MyWebSocket>())
             // register simple handler, handle all methods

examples/tls/src/main.rs

@@ -32,7 +32,7 @@ fn main() {
     HttpServer::new(
         Application::default("/")
             // enable logger
-            .middleware(Logger::new(None))
+            .middleware(middlewares::Logger::new(None))
             // register simple handler, handle all methods
             .handler("/index.html", index)
             // with path parameters

examples/websocket.rs

@@ -73,7 +73,7 @@ fn main() {
     HttpServer::new(
         Application::default("/")
             // enable logger
-            .middleware(Logger::new(None))
+            .middleware(middlewares::Logger::new(None))
             // websocket route
             .resource("/ws/", |r| r.get::<MyWebSocket>())
             .route_handler("/", StaticFiles::new("examples/static/", true)))

src/application.rs

@@ -10,27 +10,9 @@ use recognizer::{RouteRecognizer, check_pattern};
 use httprequest::HttpRequest;
 use httpresponse::HttpResponse;
 use channel::HttpHandler;
+use middlewares::Middleware;
 
 
-/// Middleware definition
-#[allow(unused_variables)]
-pub trait Middleware {
-
-    /// Method is called when request is ready.
-    fn start(&self, req: &mut HttpRequest) -> Result<(), HttpResponse> {
-        Ok(())
-    }
-
-    /// Method is called when handler returns response,
-    /// but before sending body streams to peer.
-    fn response(&self, req: &mut HttpRequest, resp: HttpResponse) -> HttpResponse {
-        resp
-    }
-
-    /// Http interation is finished
-    fn finish(&self, req: &mut HttpRequest, resp: &HttpResponse) {}
-}
-
 /// Application
 pub struct Application<S> {
     state: Rc<S>,
@@ -67,19 +49,13 @@ impl<S: 'static> HttpHandler for Application<S> {
     }
     
     fn handle(&self, req: &mut HttpRequest, payload: Payload) -> Task {
-        // run middlewares
-        if !self.middlewares.is_empty() {
-            for middleware in self.middlewares.iter() {
-                if let Err(resp) = middleware.start(req) {
-                    return Task::reply(resp)
-                };
-            }
         let mut task = self.run(req, payload);
+
+        // init middlewares
+        if !self.middlewares.is_empty() {
             task.set_middlewares(Rc::clone(&self.middlewares));
-            task
-        } else {
-            self.run(req, payload)
         }
+        task
     }
 }
 

src/context.rs

@@ -18,7 +18,7 @@ use route::{Route, Frame};
 use httpresponse::HttpResponse;
 
 
-/// Actor execution context
+/// Http actor execution context
 pub struct HttpContext<A> where A: Actor<Context=HttpContext<A>> + Route,
 {
     act: Option<A>,

src/lib.rs

@@ -42,7 +42,6 @@ mod date;
 mod encoding;
 mod httprequest;
 mod httpresponse;
-mod logger;
 mod payload;
 mod resource;
 mod recognizer;
@@ -62,17 +61,17 @@ pub mod ws;
 pub mod dev;
 pub mod httpcodes;
 pub mod multipart;
+pub mod middlewares;
 pub use encoding::ContentEncoding;
 pub use error::ParseError;
 pub use body::{Body, BinaryBody};
-pub use application::{Application, ApplicationBuilder, Middleware};
+pub use application::{Application, ApplicationBuilder};
 pub use httprequest::{HttpRequest, UrlEncoded};
 pub use httpresponse::{HttpResponse, HttpResponseBuilder};
 pub use payload::{Payload, PayloadItem, PayloadError};
 pub use route::{Frame, Route, RouteFactory, RouteHandler, RouteResult};
 pub use resource::{Reply, Resource, HandlerResult};
 pub use recognizer::{Params, RouteRecognizer};
-pub use logger::Logger;
 pub use server::HttpServer;
 pub use context::HttpContext;
 pub use channel::HttpChannel;

src/middlewares/logger.rs

@@ -6,9 +6,9 @@ use std::fmt::{Display, Formatter};
 
 use time;
 
-use application::Middleware;
 use httprequest::HttpRequest;
 use httpresponse::HttpResponse;
+use middlewares::{Middleware, Started, Finished};
 
 /// `Middleware` for logging request and response info to the terminal.
 pub struct Logger {
@@ -37,16 +37,13 @@ impl Logger {
 struct StartTime(time::Tm);
 
 impl Logger {
-    fn initialise(&self, req: &mut HttpRequest) {
-        req.extensions().insert(StartTime(time::now()));
-    }
 
     fn log(&self, req: &mut HttpRequest, resp: &HttpResponse) {
         let entry_time = req.extensions().get::<StartTime>().unwrap().0;
 
         let response_time = time::now() - entry_time;
-        let response_time_ms = (response_time.num_seconds() * 1000) as f64 + (response_time.num_nanoseconds().unwrap_or(0) as f64) / 1000000.0;
-
+        let response_time_ms = (response_time.num_seconds() * 1000) as f64 +
+            (response_time.num_nanoseconds().unwrap_or(0) as f64) / 1000000000.0;
         {
             let render = |fmt: &mut Formatter, text: &FormatText| {
                 match *text {
@@ -61,7 +58,7 @@ impl Logger {
                     },
                     FormatText::Status => resp.status().fmt(fmt),
                     FormatText::ResponseTime =>
-                        fmt.write_fmt(format_args!("{} ms", response_time_ms)),
+                        fmt.write_fmt(format_args!("{} sec", response_time_ms)),
                     FormatText::RemoteAddr => Ok(()), //req.remote_addr.fmt(fmt),
                     FormatText::RequestTime => {
                         entry_time.strftime("%Y-%m-%dT%H:%M:%S.%fZ%z")
@@ -77,13 +74,15 @@ impl Logger {
 }
 
 impl Middleware for Logger {
-    fn start(&self, req: &mut HttpRequest) -> Result<(), HttpResponse> {
-        self.initialise(req);
-        Ok(())
+
+    fn start(&self, req: &mut HttpRequest) -> Started {
+        req.extensions().insert(StartTime(time::now()));
+        Started::Done
     }
 
-    fn finish(&self, req: &mut HttpRequest, resp: &HttpResponse) {
+    fn finish(&self, req: &mut HttpRequest, resp: &HttpResponse) -> Finished {
         self.log(req, resp);
+        Finished::Done
     }
 }
 

src/middlewares/mod.rs

@@ -0,0 +1,247 @@
+//! Middlewares
+use std::rc::Rc;
+use std::error::Error;
+use futures::{Async, Future, Poll};
+use httprequest::HttpRequest;
+use httpresponse::HttpResponse;
+
+mod logger;
+pub use self::logger::Logger;
+
+/// Middleware start result
+pub enum Started {
+    /// Execution completed
+    Done,
+    /// New http response got generated. If middleware generates response
+    /// handler execution halts.
+    Response(HttpResponse),
+    /// Execution completed, but run future to completion.
+    Future(Box<Future<Item=(), Error=HttpResponse>>),
+}
+
+/// Middleware execution result
+pub enum Response {
+    /// New http response got generated
+    Response(HttpResponse),
+    /// Result is a future that resolves to a new http response
+    Future(Box<Future<Item=HttpResponse, Error=HttpResponse>>),
+}
+
+/// Middleware finish result
+pub enum Finished {
+    /// Execution completed
+    Done,
+    /// Execution completed, but run future to completion
+    Future(Box<Future<Item=(), Error=Box<Error>>>),
+}
+
+/// Middleware definition
+#[allow(unused_variables)]
+pub trait Middleware {
+
+    /// Method is called when request is ready. It may return
+    /// future, which should resolve before next middleware get called.
+    fn start(&self, req: &mut HttpRequest) -> Started {
+        Started::Done
+    }
+
+    /// Method is called when handler returns response,
+    /// but before sending body stream to peer.
+    fn response(&self, req: &mut HttpRequest, resp: HttpResponse) -> Response {
+        Response::Response(resp)
+    }
+
+    /// Method is called after http response get sent to peer.
+    fn finish(&self, req: &mut HttpRequest, resp: &HttpResponse) -> Finished {
+        Finished::Done
+    }
+}
+
+/// Middlewares executor
+pub(crate) struct MiddlewaresExecutor {
+    state: ExecutorState,
+    fut: Option<Box<Future<Item=HttpResponse, Error=HttpResponse>>>,
+    started: Option<Box<Future<Item=(), Error=HttpResponse>>>,
+    finished: Option<Box<Future<Item=(), Error=Box<Error>>>>,
+    middlewares: Option<Rc<Vec<Box<Middleware>>>>,
+}
+
+enum ExecutorState {
+    None,
+    Starting(usize),
+    Started(usize),
+    Processing(usize, usize),
+    Finishing(usize),
+}
+
+impl Default for MiddlewaresExecutor {
+
+    fn default() -> MiddlewaresExecutor {
+        MiddlewaresExecutor {
+            fut: None,
+            started: None,
+            finished: None,
+            state: ExecutorState::None,
+            middlewares: None,
+        }
+    }
+}
+
+impl MiddlewaresExecutor {
+
+    pub fn start(&mut self, mw: Rc<Vec<Box<Middleware>>>) {
+        self.state = ExecutorState::Starting(0);
+        self.middlewares = Some(mw);
+    }
+
+    pub fn starting(&mut self, req: &mut HttpRequest) -> Poll<Option<HttpResponse>, ()> {
+        if let Some(ref middlewares) = self.middlewares {
+            let state = &mut self.state;
+            if let ExecutorState::Starting(mut idx) = *state {
+                loop {
+                    // poll latest fut
+                    if let Some(ref mut fut) = self.started {
+                        match fut.poll() {
+                            Ok(Async::NotReady) => return Ok(Async::NotReady),
+                            Ok(Async::Ready(())) => idx += 1,
+                            Err(response) => {
+                                *state = ExecutorState::Started(idx);
+                                return Ok(Async::Ready(Some(response)))
+                            }
+                        }
+                    }
+                    self.started = None;
+
+                    if idx >= middlewares.len() {
+                        *state = ExecutorState::Started(idx-1);
+                        return Ok(Async::Ready(None))
+                    } else {
+                        match middlewares[idx].start(req) {
+                            Started::Done => idx += 1,
+                            Started::Response(resp) => {
+                                *state = ExecutorState::Started(idx);
+                                return Ok(Async::Ready(Some(resp)))
+                            },
+                            Started::Future(fut) => {
+                                self.started = Some(fut);
+                            },
+                        }
+                    }
+                }
+            }
+        }
+        Ok(Async::Ready(None))
+    }
+
+    pub fn processing(&mut self, req: &mut HttpRequest) -> Poll<Option<HttpResponse>, ()> {
+        if let Some(ref middlewares) = self.middlewares {
+            let state = &mut self.state;
+            match *state {
+                ExecutorState::Processing(mut idx, total) => {
+                    loop {
+                        // poll latest fut
+                        let mut resp = match self.fut.as_mut().unwrap().poll() {
+                            Ok(Async::NotReady) => return Ok(Async::NotReady),
+                            Ok(Async::Ready(response)) | Err(response) => {
+                                idx += 1;
+                                response
+                            }
+                        };
+                        self.fut = None;
+
+                        loop {
+                            if idx == 0 {
+                                *state = ExecutorState::Finishing(total);
+                                return Ok(Async::Ready(Some(resp)))
+                            } else {
+                                match middlewares[idx].response(req, resp) {
+                                    Response::Response(r) => {
+                                        idx -= 1;
+                                        resp = r
+                                    },
+                                    Response::Future(fut) => {
+                                        self.fut = Some(fut);
+                                        break
+                                    },
+                                }
+                            }
+                        }
+                    }
+                }
+                _ => Ok(Async::Ready(None))
+            }
+        } else {
+            Ok(Async::Ready(None))
+        }
+    }
+
+    pub fn finishing(&mut self, req: &mut HttpRequest, resp: &HttpResponse) -> Poll<(), ()> {
+        if let Some(ref middlewares) = self.middlewares {
+            let state = &mut self.state;
+            if let ExecutorState::Finishing(mut idx) = *state {
+                loop {
+                    // poll latest fut
+                    if let Some(ref mut fut) = self.finished {
+                        match fut.poll() {
+                            Ok(Async::NotReady) => return Ok(Async::NotReady),
+                            Ok(Async::Ready(())) => idx -= 1,
+                            Err(err) => {
+                                error!("Middleware finish error: {}", err);
+                            }
+                        }
+                    }
+                    self.finished = None;
+
+                    match middlewares[idx].finish(req, resp) {
+                        Finished::Done => {
+                            if idx == 0 {
+                                return Ok(Async::Ready(()))
+                            } else {
+                                idx -= 1
+                            }
+                        }
+                        Finished::Future(fut) => {
+                            self.finished = Some(fut);
+                        },
+                    }
+                }
+            }
+        }
+        Ok(Async::Ready(()))
+    }
+
+    pub fn response(&mut self, req: &mut HttpRequest, resp: HttpResponse)
+                    -> Option<HttpResponse>
+    {
+        if let Some(ref middlewares) = self.middlewares {
+            let mut resp = resp;
+            let state = &mut self.state;
+            match *state {
+                ExecutorState::Started(mut idx) => {
+                    let total = idx;
+                    loop {
+                        resp = match middlewares[idx].response(req, resp) {
+                            Response::Response(r) => {
+                                if idx == 0 {
+                                    *state = ExecutorState::Finishing(total);
+                                    return Some(r)
+                                } else {
+                                    idx -= 1;
+                                    r
+                                }
+                            },
+                            Response::Future(fut) => {
+                                *state = ExecutorState::Processing(idx, total);
+                                self.fut = Some(fut);
+                                return None
+                            },
+                        };
+                    }
+                }
+                _ => Some(resp)
+            }
+        } else {
+            Some(resp)
+        }
+    }
+}

src/task.rs

@@ -8,7 +8,7 @@ use futures::task::{Task as FutureTask, current as current_task};
 
 use h1writer::{Writer, WriterState};
 use route::Frame;
-use application::Middleware;
+use middlewares::{Middleware, MiddlewaresExecutor};
 use httprequest::HttpRequest;
 use httpresponse::HttpResponse;
 
@@ -109,7 +109,7 @@ pub struct Task {
     drain: Vec<Rc<RefCell<DrainFut>>>,
     prepared: Option<HttpResponse>,
     disconnected: bool,
-    middlewares: Option<Rc<Vec<Box<Middleware>>>>,
+    middlewares: MiddlewaresExecutor,
 }
 
 impl Task {
@@ -119,49 +119,42 @@ impl Task {
         frames.push_back(Frame::Message(response.into()));
         frames.push_back(Frame::Payload(None));
 
-        Task {
-            state: TaskRunningState::Running,
+        Task { state: TaskRunningState::Running,
                iostate: TaskIOState::Done,
                frames: frames,
                drain: Vec::new(),
                stream: TaskStream::None,
                prepared: None,
                disconnected: false,
-            middlewares: None,
-        }
+               middlewares: MiddlewaresExecutor::default() }
     }
 
-    pub(crate) fn with_stream<S>(stream: S) -> Self
-        where S: Stream<Item=Frame, Error=io::Error> + 'static
-    {
-        Task {
-            state: TaskRunningState::Running,
-            iostate: TaskIOState::ReadingMessage,
-            frames: VecDeque::new(),
-            stream: TaskStream::Stream(Box::new(stream)),
-            drain: Vec::new(),
-            prepared: None,
-            disconnected: false,
-            middlewares: None,
-        }
-    }
-
-    pub(crate) fn with_context<C: IoContext>(ctx: C) -> Self
-    {
-        Task {
-            state: TaskRunningState::Running,
+    pub(crate) fn with_context<C: IoContext>(ctx: C) -> Self {
+        Task { state: TaskRunningState::Running,
                iostate: TaskIOState::ReadingMessage,
                frames: VecDeque::new(),
                stream: TaskStream::Context(Box::new(ctx)),
                drain: Vec::new(),
                prepared: None,
                disconnected: false,
-            middlewares: None,
+               middlewares: MiddlewaresExecutor::default() }
     }
+
+    pub(crate) fn with_stream<S>(stream: S) -> Self
+        where S: Stream<Item=Frame, Error=io::Error> + 'static
+    {
+        Task { state: TaskRunningState::Running,
+               iostate: TaskIOState::ReadingMessage,
+               frames: VecDeque::new(),
+               stream: TaskStream::Stream(Box::new(stream)),
+               drain: Vec::new(),
+               prepared: None,
+               disconnected: false,
+               middlewares: MiddlewaresExecutor::default() }
     }
 
     pub(crate) fn set_middlewares(&mut self, middlewares: Rc<Vec<Box<Middleware>>>) {
-        self.middlewares = Some(middlewares);
+        self.middlewares.start(middlewares)
     }
 
     pub(crate) fn disconnected(&mut self) {
@@ -175,6 +168,17 @@ impl Task {
         where T: Writer
     {
         trace!("POLL-IO frames:{:?}", self.frames.len());
+
+        // start middlewares
+        match self.middlewares.starting(req) {
+            Ok(Async::NotReady) => return Ok(Async::NotReady),
+            Ok(Async::Ready(None)) | Err(_) => (),
+            Ok(Async::Ready(Some(response))) => {
+                self.frames.clear();
+                self.frames.push_front(Frame::Message(response));
+            },
+        }
+
         // response is completed
         if self.frames.is_empty() && self.iostate.is_done() {
             return Ok(Async::Ready(self.state.is_done()));
@@ -190,29 +194,40 @@ impl Task {
                 }
             }
 
+            // process middlewares response
+            match self.middlewares.processing(req) {
+                Err(_) => return Err(()),
+                Ok(Async::NotReady) => return Ok(Async::NotReady),
+                Ok(Async::Ready(None)) => (),
+                Ok(Async::Ready(Some(mut response))) => {
+                    let result = io.start(req, &mut response);
+                    self.prepared = Some(response);
+                    match result {
+                        Ok(WriterState::Pause) => {
+                            self.state.pause();
+                        }
+                        Ok(WriterState::Done) => self.state.resume(),
+                        Err(_) => return Err(())
+                    }
+                },
+            }
+
             // if task is paused, write buffer probably is 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(response) => {
+                        Frame::Message(resp) => {
                             // run middlewares
-                            let mut response =
-                                if let Some(middlewares) = self.middlewares.take() {
-                                    let mut response = response;
-                                    for middleware in middlewares.iter() {
-                                        response = middleware.response(req, response);
-                                    }
-                                    self.middlewares = Some(middlewares);
-                                    response
-                                } else {
-                                    response
-                                };
-
-                            let result = io.start(req, &mut response);
-                            self.prepared = Some(response);
+                            if let Some(mut resp) = self.middlewares.response(req, resp) {
+                                let result = io.start(req, &mut resp);
+                                self.prepared = Some(resp);
                                 result
+                            } else {
+                                // middlewares need to run some futures
+                                return self.poll_io(io, req)
+                            }
                         }
                         Frame::Payload(Some(chunk)) => {
                             io.write(chunk.as_ref())
@@ -251,7 +266,7 @@ impl Task {
             }
         }
 
-        // drain
+        // drain futures
         if !self.drain.is_empty() {
             for fut in &mut self.drain {
                 fut.borrow_mut().set()
@@ -261,12 +276,11 @@ impl Task {
 
         // response is completed
         if self.iostate.is_done() {
-            // run middlewares
-            if let Some(ref mut resp) = self.prepared {
-                if let Some(middlewares) = self.middlewares.take() {
-                    for middleware in middlewares.iter() {
-                        middleware.finish(req, resp);
-                    }
+            // finish middlewares
+            if let Some(ref resp) = self.prepared {
+                match self.middlewares.finishing(req, resp) {
+                    Ok(Async::NotReady) => return Ok(Async::NotReady),
+                    _ => (),
                 }
             }
             Ok(Async::Ready(self.state.is_done()))
@@ -276,8 +290,7 @@ impl Task {
     }
 
     fn poll_stream<S>(&mut self, stream: &mut S) -> Poll<(), ()>
-        where S: Stream<Item=Frame, Error=io::Error>
-    {
+        where S: Stream<Item=Frame, Error=io::Error> {
         loop {
             match stream.poll() {
                 Ok(Async::Ready(Some(frame))) => {

tests/test_server.rs

@@ -11,6 +11,7 @@ use tokio_core::net::TcpListener;
 use actix::*;
 use actix_web::*;
 
+
 fn create_server<T, A>() -> HttpServer<T, A, Application<()>> {
     HttpServer::new(
         vec![Application::default("/")
@@ -59,19 +60,20 @@ struct MiddlewareTest {
     finish: Arc<AtomicUsize>,
 }
 
-impl Middleware for MiddlewareTest {
-    fn start(&self, _: &mut HttpRequest) -> Result<(), HttpResponse> {
+impl middlewares::Middleware for MiddlewareTest {
+    fn start(&self, _: &mut HttpRequest) -> middlewares::Started {
         self.start.store(self.start.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
-        Ok(())
+        middlewares::Started::Done
     }
 
-    fn response(&self, _: &mut HttpRequest, resp: HttpResponse) -> HttpResponse {
+    fn response(&self, _: &mut HttpRequest, resp: HttpResponse) -> middlewares::Response {
         self.response.store(self.response.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
-        resp
+        middlewares::Response::Response(resp)
     }
 
-    fn finish(&self, _: &mut HttpRequest, _: &HttpResponse) {
+    fn finish(&self, _: &mut HttpRequest, _: &HttpResponse) -> middlewares::Finished {
         self.finish.store(self.finish.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
+        middlewares::Finished::Done
     }
 }