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
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
//! HTTP/1 Server Connections

use std::error::Error as StdError;
use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};
use std::time::Duration;

use crate::rt::{Read, Write};
use crate::upgrade::Upgraded;
use bytes::Bytes;
use futures_util::ready;

use crate::body::{Body, Incoming as IncomingBody};
use crate::proto;
use crate::service::HttpService;
use crate::{
    common::time::{Dur, Time},
    rt::Timer,
};

type Http1Dispatcher<T, B, S> = proto::h1::Dispatcher<
    proto::h1::dispatch::Server<S, IncomingBody>,
    B,
    T,
    proto::ServerTransaction,
>;

pin_project_lite::pin_project! {
    /// A [`Future`](core::future::Future) representing an HTTP/1 connection, bound to a
    /// [`Service`](crate::service::Service), returned from
    /// [`Builder::serve_connection`](struct.Builder.html#method.serve_connection).
    ///
    /// To drive HTTP on this connection this future **must be polled**, typically with
    /// `.await`. If it isn't polled, no progress will be made on this connection.
    #[must_use = "futures do nothing unless polled"]
    pub struct Connection<T, S>
    where
        S: HttpService<IncomingBody>,
    {
        conn: Http1Dispatcher<T, S::ResBody, S>,
    }
}

/// A configuration builder for HTTP/1 server connections.
///
/// **Note**: The default values of options are *not considered stable*. They
/// are subject to change at any time.
///
/// # Example
///
/// ```
/// # use std::time::Duration;
/// # use hyper::server::conn::http1::Builder;
/// # fn main() {
/// let mut http = Builder::new();
/// // Set options one at a time
/// http.half_close(false);
///
/// // Or, chain multiple options
/// http.keep_alive(false).title_case_headers(true).max_buf_size(8192);
///
/// # }
/// ```
///
/// Use [`Builder::serve_connection`](struct.Builder.html#method.serve_connection)
/// to bind the built connection to a service.
#[derive(Clone, Debug)]
pub struct Builder {
    timer: Time,
    h1_half_close: bool,
    h1_keep_alive: bool,
    h1_title_case_headers: bool,
    h1_preserve_header_case: bool,
    h1_max_headers: Option<usize>,
    h1_header_read_timeout: Dur,
    h1_writev: Option<bool>,
    max_buf_size: Option<usize>,
    pipeline_flush: bool,
    date_header: bool,
}

/// Deconstructed parts of a `Connection`.
///
/// This allows taking apart a `Connection` at a later time, in order to
/// reclaim the IO object, and additional related pieces.
#[derive(Debug)]
#[non_exhaustive]
pub struct Parts<T, S> {
    /// The original IO object used in the handshake.
    pub io: T,
    /// A buffer of bytes that have been read but not processed as HTTP.
    ///
    /// If the client sent additional bytes after its last request, and
    /// this connection "ended" with an upgrade, the read buffer will contain
    /// those bytes.
    ///
    /// You will want to check for any existing bytes if you plan to continue
    /// communicating on the IO object.
    pub read_buf: Bytes,
    /// The `Service` used to serve this connection.
    pub service: S,
}

// ===== impl Connection =====

impl<I, S> fmt::Debug for Connection<I, S>
where
    S: HttpService<IncomingBody>,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Connection").finish()
    }
}

impl<I, B, S> Connection<I, S>
where
    S: HttpService<IncomingBody, ResBody = B>,
    S::Error: Into<Box<dyn StdError + Send + Sync>>,
    I: Read + Write + Unpin,
    B: Body + 'static,
    B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
    /// Start a graceful shutdown process for this connection.
    ///
    /// This `Connection` should continue to be polled until shutdown
    /// can finish.
    ///
    /// # Note
    ///
    /// This should only be called while the `Connection` future is still
    /// pending. If called after `Connection::poll` has resolved, this does
    /// nothing.
    pub fn graceful_shutdown(mut self: Pin<&mut Self>) {
        self.conn.disable_keep_alive();
    }

    /// Return the inner IO object, and additional information.
    ///
    /// If the IO object has been "rewound" the io will not contain those bytes rewound.
    /// This should only be called after `poll_without_shutdown` signals
    /// that the connection is "done". Otherwise, it may not have finished
    /// flushing all necessary HTTP bytes.
    ///
    /// # Panics
    /// This method will panic if this connection is using an h2 protocol.
    pub fn into_parts(self) -> Parts<I, S> {
        let (io, read_buf, dispatch) = self.conn.into_inner();
        Parts {
            io,
            read_buf,
            service: dispatch.into_service(),
        }
    }

    /// Poll the connection for completion, but without calling `shutdown`
    /// on the underlying IO.
    ///
    /// This is useful to allow running a connection while doing an HTTP
    /// upgrade. Once the upgrade is completed, the connection would be "done",
    /// but it is not desired to actually shutdown the IO object. Instead you
    /// would take it back using `into_parts`.
    pub fn poll_without_shutdown(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>>
    where
        S: Unpin,
        S::Future: Unpin,
    {
        self.conn.poll_without_shutdown(cx)
    }

    /// Prevent shutdown of the underlying IO object at the end of service the request,
    /// instead run `into_parts`. This is a convenience wrapper over `poll_without_shutdown`.
    ///
    /// # Error
    ///
    /// This errors if the underlying connection protocol is not HTTP/1.
    pub fn without_shutdown(self) -> impl Future<Output = crate::Result<Parts<I, S>>> {
        let mut zelf = Some(self);
        futures_util::future::poll_fn(move |cx| {
            ready!(zelf.as_mut().unwrap().conn.poll_without_shutdown(cx))?;
            Poll::Ready(Ok(zelf.take().unwrap().into_parts()))
        })
    }

    /// Enable this connection to support higher-level HTTP upgrades.
    ///
    /// See [the `upgrade` module](crate::upgrade) for more.
    pub fn with_upgrades(self) -> UpgradeableConnection<I, S>
    where
        I: Send,
    {
        UpgradeableConnection { inner: Some(self) }
    }
}

impl<I, B, S> Future for Connection<I, S>
where
    S: HttpService<IncomingBody, ResBody = B>,
    S::Error: Into<Box<dyn StdError + Send + Sync>>,
    I: Read + Write + Unpin,
    B: Body + 'static,
    B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
    type Output = crate::Result<()>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        match ready!(Pin::new(&mut self.conn).poll(cx)) {
            Ok(done) => {
                match done {
                    proto::Dispatched::Shutdown => {}
                    proto::Dispatched::Upgrade(pending) => {
                        // With no `Send` bound on `I`, we can't try to do
                        // upgrades here. In case a user was trying to use
                        // `Body::on_upgrade` with this API, send a special
                        // error letting them know about that.
                        pending.manual();
                    }
                };
                Poll::Ready(Ok(()))
            }
            Err(e) => Poll::Ready(Err(e)),
        }
    }
}

// ===== impl Builder =====

impl Builder {
    /// Create a new connection builder.
    pub fn new() -> Self {
        Self {
            timer: Time::Empty,
            h1_half_close: false,
            h1_keep_alive: true,
            h1_title_case_headers: false,
            h1_preserve_header_case: false,
            h1_max_headers: None,
            h1_header_read_timeout: Dur::Default(Some(Duration::from_secs(30))),
            h1_writev: None,
            max_buf_size: None,
            pipeline_flush: false,
            date_header: true,
        }
    }
    /// Set whether HTTP/1 connections should support half-closures.
    ///
    /// Clients can chose to shutdown their write-side while waiting
    /// for the server to respond. Setting this to `true` will
    /// prevent closing the connection immediately if `read`
    /// detects an EOF in the middle of a request.
    ///
    /// Default is `false`.
    pub fn half_close(&mut self, val: bool) -> &mut Self {
        self.h1_half_close = val;
        self
    }

    /// Enables or disables HTTP/1 keep-alive.
    ///
    /// Default is true.
    pub fn keep_alive(&mut self, val: bool) -> &mut Self {
        self.h1_keep_alive = val;
        self
    }

    /// Set whether HTTP/1 connections will write header names as title case at
    /// the socket level.
    ///
    /// Default is false.
    pub fn title_case_headers(&mut self, enabled: bool) -> &mut Self {
        self.h1_title_case_headers = enabled;
        self
    }

    /// Set whether to support preserving original header cases.
    ///
    /// Currently, this will record the original cases received, and store them
    /// in a private extension on the `Request`. It will also look for and use
    /// such an extension in any provided `Response`.
    ///
    /// Since the relevant extension is still private, there is no way to
    /// interact with the original cases. The only effect this can have now is
    /// to forward the cases in a proxy-like fashion.
    ///
    /// Default is false.
    pub fn preserve_header_case(&mut self, enabled: bool) -> &mut Self {
        self.h1_preserve_header_case = enabled;
        self
    }

    /// Set the maximum number of headers.
    ///
    /// When a request is received, the parser will reserve a buffer to store headers for optimal
    /// performance.
    ///
    /// If server receives more headers than the buffer size, it responds to the client with
    /// "431 Request Header Fields Too Large".
    ///
    /// Note that headers is allocated on the stack by default, which has higher performance. After
    /// setting this value, headers will be allocated in heap memory, that is, heap memory
    /// allocation will occur for each request, and there will be a performance drop of about 5%.
    ///
    /// Default is 100.
    pub fn max_headers(&mut self, val: usize) -> &mut Self {
        self.h1_max_headers = Some(val);
        self
    }

    /// Set a timeout for reading client request headers. If a client does not
    /// transmit the entire header within this time, the connection is closed.
    ///
    /// Requires a [`Timer`] set by [`Builder::timer`] to take effect. Panics if `header_read_timeout` is configured
    /// without a [`Timer`].
    ///
    /// Pass `None` to disable.
    ///
    /// Default is 30 seconds.
    pub fn header_read_timeout(&mut self, read_timeout: impl Into<Option<Duration>>) -> &mut Self {
        self.h1_header_read_timeout = Dur::Configured(read_timeout.into());
        self
    }

    /// Set whether HTTP/1 connections should try to use vectored writes,
    /// or always flatten into a single buffer.
    ///
    /// Note that setting this to false may mean more copies of body data,
    /// but may also improve performance when an IO transport doesn't
    /// support vectored writes well, such as most TLS implementations.
    ///
    /// Setting this to true will force hyper to use queued strategy
    /// which may eliminate unnecessary cloning on some TLS backends
    ///
    /// Default is `auto`. In this mode hyper will try to guess which
    /// mode to use
    pub fn writev(&mut self, val: bool) -> &mut Self {
        self.h1_writev = Some(val);
        self
    }

    /// Set the maximum buffer size for the connection.
    ///
    /// Default is ~400kb.
    ///
    /// # Panics
    ///
    /// The minimum value allowed is 8192. This method panics if the passed `max` is less than the minimum.
    pub fn max_buf_size(&mut self, max: usize) -> &mut Self {
        assert!(
            max >= proto::h1::MINIMUM_MAX_BUFFER_SIZE,
            "the max_buf_size cannot be smaller than the minimum that h1 specifies."
        );
        self.max_buf_size = Some(max);
        self
    }

    /// Set whether the `date` header should be included in HTTP responses.
    ///
    /// Note that including the `date` header is recommended by RFC 7231.
    ///
    /// Default is true.
    pub fn auto_date_header(&mut self, enabled: bool) -> &mut Self {
        self.date_header = enabled;
        self
    }

    /// Aggregates flushes to better support pipelined responses.
    ///
    /// Experimental, may have bugs.
    ///
    /// Default is false.
    pub fn pipeline_flush(&mut self, enabled: bool) -> &mut Self {
        self.pipeline_flush = enabled;
        self
    }

    /// Set the timer used in background tasks.
    pub fn timer<M>(&mut self, timer: M) -> &mut Self
    where
        M: Timer + Send + Sync + 'static,
    {
        self.timer = Time::Timer(Arc::new(timer));
        self
    }

    /// Bind a connection together with a [`Service`](crate::service::Service).
    ///
    /// This returns a Future that must be polled in order for HTTP to be
    /// driven on the connection.
    ///
    /// # Panics
    ///
    /// If a timeout option has been configured, but a `timer` has not been
    /// provided, calling `serve_connection` will panic.
    ///
    /// # Example
    ///
    /// ```
    /// # use hyper::{body::Incoming, Request, Response};
    /// # use hyper::service::Service;
    /// # use hyper::server::conn::http1::Builder;
    /// # use hyper::rt::{Read, Write};
    /// # async fn run<I, S>(some_io: I, some_service: S)
    /// # where
    /// #     I: Read + Write + Unpin + Send + 'static,
    /// #     S: Service<hyper::Request<Incoming>, Response=hyper::Response<Incoming>> + Send + 'static,
    /// #     S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
    /// #     S::Future: Send,
    /// # {
    /// let http = Builder::new();
    /// let conn = http.serve_connection(some_io, some_service);
    ///
    /// if let Err(e) = conn.await {
    ///     eprintln!("server connection error: {}", e);
    /// }
    /// # }
    /// # fn main() {}
    /// ```
    pub fn serve_connection<I, S>(&self, io: I, service: S) -> Connection<I, S>
    where
        S: HttpService<IncomingBody>,
        S::Error: Into<Box<dyn StdError + Send + Sync>>,
        S::ResBody: 'static,
        <S::ResBody as Body>::Error: Into<Box<dyn StdError + Send + Sync>>,
        I: Read + Write + Unpin,
    {
        let mut conn = proto::Conn::new(io);
        conn.set_timer(self.timer.clone());
        if !self.h1_keep_alive {
            conn.disable_keep_alive();
        }
        if self.h1_half_close {
            conn.set_allow_half_close();
        }
        if self.h1_title_case_headers {
            conn.set_title_case_headers();
        }
        if self.h1_preserve_header_case {
            conn.set_preserve_header_case();
        }
        if let Some(max_headers) = self.h1_max_headers {
            conn.set_http1_max_headers(max_headers);
        }
        if let Some(dur) = self
            .timer
            .check(self.h1_header_read_timeout, "header_read_timeout")
        {
            conn.set_http1_header_read_timeout(dur);
        };
        if let Some(writev) = self.h1_writev {
            if writev {
                conn.set_write_strategy_queue();
            } else {
                conn.set_write_strategy_flatten();
            }
        }
        conn.set_flush_pipeline(self.pipeline_flush);
        if let Some(max) = self.max_buf_size {
            conn.set_max_buf_size(max);
        }
        if !self.date_header {
            conn.disable_date_header();
        }
        let sd = proto::h1::dispatch::Server::new(service);
        let proto = proto::h1::Dispatcher::new(sd, conn);
        Connection { conn: proto }
    }
}

/// A future binding a connection with a Service with Upgrade support.
#[must_use = "futures do nothing unless polled"]
#[allow(missing_debug_implementations)]
pub struct UpgradeableConnection<T, S>
where
    S: HttpService<IncomingBody>,
{
    pub(super) inner: Option<Connection<T, S>>,
}

impl<I, B, S> UpgradeableConnection<I, S>
where
    S: HttpService<IncomingBody, ResBody = B>,
    S::Error: Into<Box<dyn StdError + Send + Sync>>,
    I: Read + Write + Unpin,
    B: Body + 'static,
    B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
    /// Start a graceful shutdown process for this connection.
    ///
    /// This `Connection` should continue to be polled until shutdown
    /// can finish.
    pub fn graceful_shutdown(mut self: Pin<&mut Self>) {
        // Connection (`inner`) is `None` if it was upgraded (and `poll` is `Ready`).
        // In that case, we don't need to call `graceful_shutdown`.
        if let Some(conn) = self.inner.as_mut() {
            Pin::new(conn).graceful_shutdown()
        }
    }
}

impl<I, B, S> Future for UpgradeableConnection<I, S>
where
    S: HttpService<IncomingBody, ResBody = B>,
    S::Error: Into<Box<dyn StdError + Send + Sync>>,
    I: Read + Write + Unpin + Send + 'static,
    B: Body + 'static,
    B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
    type Output = crate::Result<()>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        if let Some(conn) = self.inner.as_mut() {
            match ready!(Pin::new(&mut conn.conn).poll(cx)) {
                Ok(proto::Dispatched::Shutdown) => Poll::Ready(Ok(())),
                Ok(proto::Dispatched::Upgrade(pending)) => {
                    let (io, buf, _) = self.inner.take().unwrap().conn.into_inner();
                    pending.fulfill(Upgraded::new(io, buf));
                    Poll::Ready(Ok(()))
                }
                Err(e) => Poll::Ready(Err(e)),
            }
        } else {
            // inner is `None`, meaning the connection was upgraded, thus it's `Poll::Ready(Ok(()))`
            Poll::Ready(Ok(()))
        }
    }
}