1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
extern crate actix;

use futures::sync::oneshot;
use futures::sync::oneshot::Sender;
use futures::{Async, Future, Poll};
use smallvec::SmallVec;
use std::marker::PhantomData;

use self::actix::dev::{
    AsyncContextParts, ContextFut, ContextParts, Envelope, Mailbox, ToEnvelope,
};
use self::actix::fut::ActorFuture;
use self::actix::{
    Actor, ActorContext, ActorState, Addr, AsyncContext, Handler, Message, SpawnHandle,
};

use body::{Binary, Body};
use error::{Error, ErrorInternalServerError};
use httprequest::HttpRequest;

pub trait ActorHttpContext: 'static {
    fn disconnected(&mut self);
    fn poll(&mut self) -> Poll<Option<SmallVec<[Frame; 4]>>, Error>;
}

#[derive(Debug)]
pub enum Frame {
    Chunk(Option<Binary>),
    Drain(oneshot::Sender<()>),
}

impl Frame {
    pub fn len(&self) -> usize {
        match *self {
            Frame::Chunk(Some(ref bin)) => bin.len(),
            _ => 0,
        }
    }
}

/// Execution context for http actors
pub struct HttpContext<A, S = ()>
where
    A: Actor<Context = HttpContext<A, S>>,
{
    inner: ContextParts<A>,
    stream: Option<SmallVec<[Frame; 4]>>,
    request: HttpRequest<S>,
    disconnected: bool,
}

impl<A, S> ActorContext for HttpContext<A, S>
where
    A: Actor<Context = Self>,
{
    fn stop(&mut self) {
        self.inner.stop();
    }
    fn terminate(&mut self) {
        self.inner.terminate()
    }
    fn state(&self) -> ActorState {
        self.inner.state()
    }
}

impl<A, S> AsyncContext<A> for HttpContext<A, S>
where
    A: Actor<Context = Self>,
{
    #[inline]
    fn spawn<F>(&mut self, fut: F) -> SpawnHandle
    where
        F: ActorFuture<Item = (), Error = (), Actor = A> + 'static,
    {
        self.inner.spawn(fut)
    }
    #[inline]
    fn wait<F>(&mut self, fut: F)
    where
        F: ActorFuture<Item = (), Error = (), Actor = A> + 'static,
    {
        self.inner.wait(fut)
    }
    #[doc(hidden)]
    #[inline]
    fn waiting(&self) -> bool {
        self.inner.waiting()
            || self.inner.state() == ActorState::Stopping
            || self.inner.state() == ActorState::Stopped
    }
    #[inline]
    fn cancel_future(&mut self, handle: SpawnHandle) -> bool {
        self.inner.cancel_future(handle)
    }
    #[inline]
    fn address(&self) -> Addr<A> {
        self.inner.address()
    }
}

impl<A, S: 'static> HttpContext<A, S>
where
    A: Actor<Context = Self>,
{
    #[inline]
    /// Create a new HTTP Context from a request and an actor
    pub fn create(req: HttpRequest<S>, actor: A) -> Body {
        let mb = Mailbox::default();
        let ctx = HttpContext {
            inner: ContextParts::new(mb.sender_producer()),
            stream: None,
            request: req,
            disconnected: false,
        };
        Body::Actor(Box::new(HttpContextFut::new(ctx, actor, mb)))
    }

    /// Create a new HTTP Context
    pub fn with_factory<F>(req: HttpRequest<S>, f: F) -> Body
    where
        F: FnOnce(&mut Self) -> A + 'static,
    {
        let mb = Mailbox::default();
        let mut ctx = HttpContext {
            inner: ContextParts::new(mb.sender_producer()),
            stream: None,
            request: req,
            disconnected: false,
        };

        let act = f(&mut ctx);
        Body::Actor(Box::new(HttpContextFut::new(ctx, act, mb)))
    }
}

impl<A, S> HttpContext<A, S>
where
    A: Actor<Context = Self>,
{
    /// Shared application state
    #[inline]
    pub fn state(&self) -> &S {
        self.request.state()
    }

    /// Incoming request
    #[inline]
    pub fn request(&mut self) -> &mut HttpRequest<S> {
        &mut self.request
    }

    /// Write payload
    #[inline]
    pub fn write<B: Into<Binary>>(&mut self, data: B) {
        if !self.disconnected {
            self.add_frame(Frame::Chunk(Some(data.into())));
        } else {
            warn!("Trying to write to disconnected response");
        }
    }

    /// Indicate end of streaming payload. Also this method calls `Self::close`.
    #[inline]
    pub fn write_eof(&mut self) {
        self.add_frame(Frame::Chunk(None));
    }

    /// Returns drain future
    pub fn drain(&mut self) -> Drain<A> {
        let (tx, rx) = oneshot::channel();
        self.add_frame(Frame::Drain(tx));
        Drain::new(rx)
    }

    /// Check if connection still open
    #[inline]
    pub fn connected(&self) -> bool {
        !self.disconnected
    }

    #[inline]
    fn add_frame(&mut self, frame: Frame) {
        if self.stream.is_none() {
            self.stream = Some(SmallVec::new());
        }
        if let Some(s) = self.stream.as_mut() {
            s.push(frame)
        }
    }

    /// Handle of the running future
    ///
    /// SpawnHandle is the handle returned by `AsyncContext::spawn()` method.
    pub fn handle(&self) -> SpawnHandle {
        self.inner.curr_handle()
    }
}

impl<A, S> AsyncContextParts<A> for HttpContext<A, S>
where
    A: Actor<Context = Self>,
{
    fn parts(&mut self) -> &mut ContextParts<A> {
        &mut self.inner
    }
}

struct HttpContextFut<A, S>
where
    A: Actor<Context = HttpContext<A, S>>,
{
    fut: ContextFut<A, HttpContext<A, S>>,
}

impl<A, S> HttpContextFut<A, S>
where
    A: Actor<Context = HttpContext<A, S>>,
{
    fn new(ctx: HttpContext<A, S>, act: A, mailbox: Mailbox<A>) -> Self {
        let fut = ContextFut::new(ctx, act, mailbox);
        HttpContextFut { fut }
    }
}

impl<A, S> ActorHttpContext for HttpContextFut<A, S>
where
    A: Actor<Context = HttpContext<A, S>>,
    S: 'static,
{
    #[inline]
    fn disconnected(&mut self) {
        self.fut.ctx().disconnected = true;
        self.fut.ctx().stop();
    }

    fn poll(&mut self) -> Poll<Option<SmallVec<[Frame; 4]>>, Error> {
        if self.fut.alive() {
            match self.fut.poll() {
                Ok(Async::NotReady) | Ok(Async::Ready(())) => (),
                Err(_) => return Err(ErrorInternalServerError("error")),
            }
        }

        // frames
        if let Some(data) = self.fut.ctx().stream.take() {
            Ok(Async::Ready(Some(data)))
        } else if self.fut.alive() {
            Ok(Async::NotReady)
        } else {
            Ok(Async::Ready(None))
        }
    }
}

impl<A, M, S> ToEnvelope<A, M> for HttpContext<A, S>
where
    A: Actor<Context = HttpContext<A, S>> + Handler<M>,
    M: Message + Send + 'static,
    M::Result: Send,
{
    fn pack(msg: M, tx: Option<Sender<M::Result>>) -> Envelope<A> {
        Envelope::new(msg, tx)
    }
}

/// Consume a future
pub struct Drain<A> {
    fut: oneshot::Receiver<()>,
    _a: PhantomData<A>,
}

impl<A> Drain<A> {
    /// Create a drain from a future
    pub fn new(fut: oneshot::Receiver<()>) -> Self {
        Drain {
            fut,
            _a: PhantomData,
        }
    }
}

impl<A: Actor> ActorFuture for Drain<A> {
    type Item = ();
    type Error = ();
    type Actor = A;

    #[inline]
    fn poll(
        &mut self, _: &mut A, _: &mut <Self::Actor as Actor>::Context,
    ) -> Poll<Self::Item, Self::Error> {
        self.fut.poll().map_err(|_| ())
    }
}