fuchsia_bluetooth/types/
channel.rs

1// Copyright 2020 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use fidl::endpoints::{ClientEnd, Proxy};
6use futures::stream::{FusedStream, Stream};
7use futures::{Future, TryFutureExt, io};
8use log::warn;
9use std::fmt;
10use std::pin::Pin;
11use std::sync::{Arc, Mutex};
12use std::task::{Context, Poll};
13use {
14    fidl_fuchsia_bluetooth as fidl_bt, fidl_fuchsia_bluetooth_bredr as bredr,
15    fuchsia_async as fasync,
16};
17
18use crate::error::Error;
19
20/// The Channel mode in use for a L2CAP channel.
21#[derive(PartialEq, Debug, Clone)]
22pub enum ChannelMode {
23    Basic,
24    EnhancedRetransmissionMode,
25    LeCreditBasedFlowControl,
26    EnhancedCreditBasedFlowControl,
27}
28
29impl fmt::Display for ChannelMode {
30    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
31        match self {
32            ChannelMode::Basic => write!(f, "Basic"),
33            ChannelMode::EnhancedRetransmissionMode => write!(f, "ERTM"),
34            ChannelMode::LeCreditBasedFlowControl => write!(f, "LE_Credit"),
35            ChannelMode::EnhancedCreditBasedFlowControl => write!(f, "Credit"),
36        }
37    }
38}
39
40pub enum A2dpDirection {
41    Normal,
42    Source,
43    Sink,
44}
45
46impl From<A2dpDirection> for bredr::A2dpDirectionPriority {
47    fn from(pri: A2dpDirection) -> Self {
48        match pri {
49            A2dpDirection::Normal => bredr::A2dpDirectionPriority::Normal,
50            A2dpDirection::Source => bredr::A2dpDirectionPriority::Source,
51            A2dpDirection::Sink => bredr::A2dpDirectionPriority::Sink,
52        }
53    }
54}
55
56impl TryFrom<fidl_bt::ChannelMode> for ChannelMode {
57    type Error = Error;
58    fn try_from(fidl: fidl_bt::ChannelMode) -> Result<Self, Error> {
59        match fidl {
60            fidl_bt::ChannelMode::Basic => Ok(ChannelMode::Basic),
61            fidl_bt::ChannelMode::EnhancedRetransmission => {
62                Ok(ChannelMode::EnhancedRetransmissionMode)
63            }
64            fidl_bt::ChannelMode::LeCreditBasedFlowControl => {
65                Ok(ChannelMode::LeCreditBasedFlowControl)
66            }
67            fidl_bt::ChannelMode::EnhancedCreditBasedFlowControl => {
68                Ok(ChannelMode::EnhancedCreditBasedFlowControl)
69            }
70            x => Err(Error::FailedConversion(format!("Unsupported channel mode type: {x:?}"))),
71        }
72    }
73}
74
75impl From<ChannelMode> for fidl_bt::ChannelMode {
76    fn from(x: ChannelMode) -> Self {
77        match x {
78            ChannelMode::Basic => fidl_bt::ChannelMode::Basic,
79            ChannelMode::EnhancedRetransmissionMode => fidl_bt::ChannelMode::EnhancedRetransmission,
80            ChannelMode::LeCreditBasedFlowControl => fidl_bt::ChannelMode::LeCreditBasedFlowControl,
81            ChannelMode::EnhancedCreditBasedFlowControl => {
82                fidl_bt::ChannelMode::EnhancedCreditBasedFlowControl
83            }
84        }
85    }
86}
87
88/// A data channel to a remote Peer. Channels are the primary data transfer mechanism for
89/// Bluetooth profiles and protocols.
90/// Channel currently implements Deref<Target = Socket> to easily access the underlying
91/// socket, and also implements AsyncWrite using a forwarding implementation.
92#[derive(Debug)]
93pub struct Channel {
94    socket: fasync::Socket,
95    mode: ChannelMode,
96    max_tx_size: usize,
97    flush_timeout: Arc<Mutex<Option<zx::MonotonicDuration>>>,
98    audio_direction_ext: Option<bredr::AudioDirectionExtProxy>,
99    l2cap_parameters_ext: Option<bredr::L2capParametersExtProxy>,
100    audio_offload_ext: Option<bredr::AudioOffloadExtProxy>,
101    terminated: bool,
102}
103
104impl Channel {
105    /// Attempt to make a Channel from a zircon socket and a Maximum TX size received out of band.
106    /// Returns Err(status) if there is an error.
107    pub fn from_socket(socket: zx::Socket, max_tx_size: usize) -> Result<Self, zx::Status> {
108        Ok(Self::from_socket_infallible(socket, max_tx_size))
109    }
110
111    /// Make a Channel from a zircon socket and a Maximum TX size received out of band.
112    pub fn from_socket_infallible(socket: zx::Socket, max_tx_size: usize) -> Self {
113        Channel {
114            socket: fasync::Socket::from_socket(socket),
115            mode: ChannelMode::Basic,
116            max_tx_size,
117            flush_timeout: Arc::new(Mutex::new(None)),
118            audio_direction_ext: None,
119            l2cap_parameters_ext: None,
120            audio_offload_ext: None,
121            terminated: false,
122        }
123    }
124
125    /// The default max tx size is the default MTU size for L2CAP minus the channel header content.
126    /// See the Bluetooth Core Specification, Vol 3, Part A, Sec 5.1
127    pub const DEFAULT_MAX_TX: usize = 672;
128
129    /// Makes a pair of channels which are connected to each other, used commonly for testing.
130    /// The max_tx_size is set to `Channel::DEFAULT_MAX_TX`.
131    pub fn create() -> (Self, Self) {
132        Self::create_with_max_tx(Self::DEFAULT_MAX_TX)
133    }
134
135    /// Make a pair of channels which are connected to each other, used commonly for testing.
136    /// The maximum transmittable unit is taken from `max_tx_size`.
137    pub fn create_with_max_tx(max_tx_size: usize) -> (Self, Self) {
138        let (remote, local) = zx::Socket::create_datagram();
139        (
140            Channel::from_socket(remote, max_tx_size).unwrap(),
141            Channel::from_socket(local, max_tx_size).unwrap(),
142        )
143    }
144
145    /// The maximum transmittable size of a packet, in bytes.
146    /// Trying to send packets larger than this may cause the channel to be closed.
147    pub fn max_tx_size(&self) -> usize {
148        self.max_tx_size
149    }
150
151    pub fn channel_mode(&self) -> &ChannelMode {
152        &self.mode
153    }
154
155    pub fn flush_timeout(&self) -> Option<zx::MonotonicDuration> {
156        self.flush_timeout.lock().unwrap().clone()
157    }
158
159    /// Returns a future which will set the audio priority of the channel.
160    /// The future will return Err if setting the priority is not supported.
161    pub fn set_audio_priority(
162        &self,
163        dir: A2dpDirection,
164    ) -> impl Future<Output = Result<(), Error>> {
165        let proxy = self.audio_direction_ext.clone();
166        async move {
167            match proxy {
168                None => return Err(Error::profile("audio priority not supported")),
169                Some(proxy) => proxy
170                    .set_priority(dir.into())
171                    .await?
172                    .map_err(|e| Error::profile(format!("setting priority failed: {e:?}"))),
173            }
174        }
175    }
176
177    /// Attempt to set the flush timeout for this channel.
178    /// If the timeout is not already set within 1ms of `duration`, we attempt to set it using the
179    /// L2cap parameter extension.
180    /// `duration` can be infinite to set packets flushable without a timeout.
181    /// Returns a future that when polled will set the flush timeout and return the new timeout,
182    /// or return an error setting the parameter is not supported.
183    pub fn set_flush_timeout(
184        &self,
185        duration: Option<zx::MonotonicDuration>,
186    ) -> impl Future<Output = Result<Option<zx::MonotonicDuration>, Error>> {
187        let flush_timeout = self.flush_timeout.clone();
188        let current = self.flush_timeout.lock().unwrap().clone();
189        let proxy = self.l2cap_parameters_ext.clone();
190        async move {
191            match (current, duration) {
192                (None, None) => return Ok(None),
193                (Some(old), Some(new)) if (old - new).into_millis().abs() < 2 => {
194                    return Ok(current);
195                }
196                _ => {}
197            };
198            let proxy =
199                proxy.ok_or_else(|| Error::profile("l2cap parameter changing not supported"))?;
200            let parameters = fidl_bt::ChannelParameters {
201                flush_timeout: duration.clone().map(zx::MonotonicDuration::into_nanos),
202                ..Default::default()
203            };
204            let new_params = proxy.request_parameters(&parameters).await?;
205            let new_timeout = new_params.flush_timeout.map(zx::MonotonicDuration::from_nanos);
206            *(flush_timeout.lock().unwrap()) = new_timeout.clone();
207            Ok(new_timeout)
208        }
209    }
210
211    /// Get a copy of the Audio Offload Proxy for this channel, if it exists
212    pub fn audio_offload(&self) -> Option<bredr::AudioOffloadExtProxy> {
213        self.audio_offload_ext.clone()
214    }
215
216    pub fn closed<'a>(&'a self) -> impl Future<Output = Result<(), zx::Status>> + 'a {
217        let close_signals = zx::Signals::SOCKET_PEER_CLOSED;
218        let close_wait = fasync::OnSignals::new(&self.socket, close_signals);
219        close_wait.map_ok(|_o| ())
220    }
221
222    pub fn is_closed<'a>(&'a self) -> bool {
223        self.socket.is_closed()
224    }
225
226    pub fn poll_datagram(
227        &self,
228        cx: &mut Context<'_>,
229        out: &mut Vec<u8>,
230    ) -> Poll<Result<usize, zx::Status>> {
231        self.socket.poll_datagram(cx, out)
232    }
233
234    /// Read from the channel, allocating a Vec for the packet.
235    /// This will return zx::Status::SHOULD_WAIT if there is no data waiting to read.
236    pub fn read_packet(&self) -> Result<Vec<u8>, zx::Status> {
237        let bytes_waiting = self.socket.as_ref().outstanding_read_bytes()?;
238        if bytes_waiting == 0 {
239            return Err(zx::Status::SHOULD_WAIT);
240        }
241        let mut packet = vec![0; bytes_waiting];
242        let _ = self.read(&mut packet[..])?;
243        Ok(packet)
244    }
245
246    /// Read from the channel. This will return zx::Status::SHOULD_WAIT if there is no data
247    /// available.  If `buf` is not large enough, the rest of the packet will be thrown out.
248    pub fn read(&self, buf: &mut [u8]) -> Result<usize, zx::Status> {
249        self.socket.as_ref().read(buf)
250    }
251
252    /// Write to the channel.  This will return zx::Status::SHOULD_WAIT if the
253    /// the channel is too full.  Use the poll_write for asynchronous writing.
254    pub fn write(&self, bytes: &[u8]) -> Result<usize, zx::Status> {
255        self.socket.as_ref().write(bytes)
256    }
257}
258
259impl TryFrom<fidl_fuchsia_bluetooth_bredr::Channel> for Channel {
260    type Error = zx::Status;
261
262    fn try_from(fidl: bredr::Channel) -> Result<Self, Self::Error> {
263        let channel = match fidl.channel_mode.unwrap_or(fidl_bt::ChannelMode::Basic).try_into() {
264            Err(e) => {
265                warn!("Unsupported channel mode type: {e:?}");
266                return Err(zx::Status::INTERNAL);
267            }
268            Ok(c) => c,
269        };
270
271        Ok(Self {
272            socket: fasync::Socket::from_socket(fidl.socket.ok_or(zx::Status::INVALID_ARGS)?),
273            mode: channel,
274            max_tx_size: fidl.max_tx_sdu_size.ok_or(zx::Status::INVALID_ARGS)? as usize,
275            flush_timeout: Arc::new(Mutex::new(
276                fidl.flush_timeout.map(zx::MonotonicDuration::from_nanos),
277            )),
278            audio_direction_ext: fidl.ext_direction.map(|e| e.into_proxy()),
279            l2cap_parameters_ext: fidl.ext_l2cap.map(|e| e.into_proxy()),
280            audio_offload_ext: fidl.ext_audio_offload.map(|c| c.into_proxy()),
281            terminated: false,
282        })
283    }
284}
285
286impl TryFrom<Channel> for bredr::Channel {
287    type Error = Error;
288
289    fn try_from(channel: Channel) -> Result<Self, Self::Error> {
290        let socket = channel.socket.into_zx_socket();
291        let ext_direction = channel
292            .audio_direction_ext
293            .map(|proxy| {
294                let chan = proxy.into_channel()?;
295                Ok(ClientEnd::new(chan.into()))
296            })
297            .transpose()
298            .map_err(|_: bredr::AudioDirectionExtProxy| {
299                Error::profile("AudioDirection proxy in use")
300            })?;
301        let ext_l2cap = channel
302            .l2cap_parameters_ext
303            .map(|proxy| {
304                let chan = proxy.into_channel()?;
305                Ok(ClientEnd::new(chan.into()))
306            })
307            .transpose()
308            .map_err(|_: bredr::L2capParametersExtProxy| {
309                Error::profile("l2cap parameters proxy in use")
310            })?;
311        let ext_audio_offload = channel
312            .audio_offload_ext
313            .map(|proxy| {
314                let chan = proxy.into_channel()?;
315                Ok(ClientEnd::new(chan.into()))
316            })
317            .transpose()
318            .map_err(|_: bredr::AudioOffloadExtProxy| {
319                Error::profile("audio offload proxy in use")
320            })?;
321        let flush_timeout =
322            channel.flush_timeout.lock().unwrap().map(zx::MonotonicDuration::into_nanos);
323        Ok(bredr::Channel {
324            socket: Some(socket),
325            channel_mode: Some(channel.mode.into()),
326            max_tx_sdu_size: Some(channel.max_tx_size as u16),
327            ext_direction,
328            flush_timeout,
329            ext_l2cap,
330            ext_audio_offload,
331            ..Default::default()
332        })
333    }
334}
335
336impl Stream for Channel {
337    type Item = Result<Vec<u8>, zx::Status>;
338
339    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
340        if self.terminated {
341            panic!("Channel polled after terminated");
342        }
343
344        let mut res = Vec::<u8>::new();
345        loop {
346            break match self.socket.poll_datagram(cx, &mut res) {
347                // TODO(https://fxbug.dev/42072274): Sometimes sockets return spirious 0 byte packets when polled.
348                // Try again.
349                Poll::Ready(Ok(0)) => continue,
350                Poll::Ready(Ok(_size)) => Poll::Ready(Some(Ok(res))),
351                Poll::Ready(Err(zx::Status::PEER_CLOSED)) => {
352                    self.terminated = true;
353                    Poll::Ready(None)
354                }
355                Poll::Ready(Err(e)) => Poll::Ready(Some(Err(e))),
356                Poll::Pending => Poll::Pending,
357            };
358        }
359    }
360}
361
362impl FusedStream for Channel {
363    fn is_terminated(&self) -> bool {
364        self.terminated
365    }
366}
367
368impl io::AsyncRead for Channel {
369    fn poll_read(
370        mut self: Pin<&mut Self>,
371        cx: &mut Context<'_>,
372        buf: &mut [u8],
373    ) -> Poll<Result<usize, futures::io::Error>> {
374        Pin::new(&mut self.socket).as_mut().poll_read(cx, buf)
375    }
376}
377
378impl io::AsyncWrite for Channel {
379    fn poll_write(
380        mut self: Pin<&mut Self>,
381        cx: &mut Context<'_>,
382        buf: &[u8],
383    ) -> Poll<Result<usize, io::Error>> {
384        Pin::new(&mut self.socket).as_mut().poll_write(cx, buf)
385    }
386
387    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
388        Pin::new(&mut self.socket).as_mut().poll_flush(cx)
389    }
390
391    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
392        Pin::new(&mut self.socket).as_mut().poll_close(cx)
393    }
394}
395
396#[cfg(test)]
397mod tests {
398    use super::*;
399    use fidl::endpoints::create_request_stream;
400    use futures::{AsyncReadExt, FutureExt, StreamExt};
401    use std::pin::pin;
402
403    #[test]
404    fn test_channel_create_and_write() {
405        let _exec = fasync::TestExecutor::new();
406        let (mut recv, send) = Channel::create();
407
408        let mut buf: [u8; 8] = [0; 8];
409        let read_fut = AsyncReadExt::read(&mut recv, &mut buf);
410
411        let heart: &[u8] = &[0xF0, 0x9F, 0x92, 0x96];
412        assert_eq!(heart.len(), send.write(heart).expect("should write successfully"));
413
414        match read_fut.now_or_never() {
415            Some(Ok(4)) => {}
416            x => panic!("Expected Ok(4) from the read, got {x:?}"),
417        };
418        assert_eq!(heart, &buf[0..4]);
419    }
420
421    #[test]
422    fn test_channel_from_fidl() {
423        let _exec = fasync::TestExecutor::new();
424        let empty = bredr::Channel::default();
425        assert!(Channel::try_from(empty).is_err());
426
427        let (remote, _local) = zx::Socket::create_datagram();
428
429        let okay = bredr::Channel {
430            socket: Some(remote),
431            channel_mode: Some(fidl_bt::ChannelMode::Basic),
432            max_tx_sdu_size: Some(1004),
433            ..Default::default()
434        };
435
436        let chan = Channel::try_from(okay).expect("okay channel to be converted");
437
438        assert_eq!(1004, chan.max_tx_size());
439        assert_eq!(&ChannelMode::Basic, chan.channel_mode());
440    }
441
442    #[test]
443    fn test_channel_closed() {
444        let mut exec = fasync::TestExecutor::new();
445
446        let (recv, send) = Channel::create();
447
448        let closed_fut = recv.closed();
449        let mut closed_fut = pin!(closed_fut);
450
451        assert!(exec.run_until_stalled(&mut closed_fut).is_pending());
452        assert!(!recv.is_closed());
453
454        drop(send);
455
456        assert!(exec.run_until_stalled(&mut closed_fut).is_ready());
457        assert!(recv.is_closed());
458    }
459
460    #[test]
461    fn test_direction_ext() {
462        let mut exec = fasync::TestExecutor::new();
463
464        let (remote, _local) = zx::Socket::create_datagram();
465        let no_ext = bredr::Channel {
466            socket: Some(remote),
467            channel_mode: Some(fidl_bt::ChannelMode::Basic),
468            max_tx_sdu_size: Some(1004),
469            ..Default::default()
470        };
471        let channel = Channel::try_from(no_ext).unwrap();
472
473        assert!(
474            exec.run_singlethreaded(channel.set_audio_priority(A2dpDirection::Normal)).is_err()
475        );
476        assert!(exec.run_singlethreaded(channel.set_audio_priority(A2dpDirection::Sink)).is_err());
477
478        let (remote, _local) = zx::Socket::create_datagram();
479        let (client_end, mut direction_request_stream) =
480            create_request_stream::<bredr::AudioDirectionExtMarker>();
481        let ext = bredr::Channel {
482            socket: Some(remote),
483            channel_mode: Some(fidl_bt::ChannelMode::Basic),
484            max_tx_sdu_size: Some(1004),
485            ext_direction: Some(client_end),
486            ..Default::default()
487        };
488
489        let channel = Channel::try_from(ext).unwrap();
490
491        let audio_direction_fut = channel.set_audio_priority(A2dpDirection::Normal);
492        let mut audio_direction_fut = pin!(audio_direction_fut);
493
494        assert!(exec.run_until_stalled(&mut audio_direction_fut).is_pending());
495
496        match exec.run_until_stalled(&mut direction_request_stream.next()) {
497            Poll::Ready(Some(Ok(bredr::AudioDirectionExtRequest::SetPriority {
498                priority,
499                responder,
500            }))) => {
501                assert_eq!(bredr::A2dpDirectionPriority::Normal, priority);
502                responder.send(Ok(())).expect("response to send cleanly");
503            }
504            x => panic!("Expected a item to be ready on the request stream, got {:?}", x),
505        };
506
507        match exec.run_until_stalled(&mut audio_direction_fut) {
508            Poll::Ready(Ok(())) => {}
509            _x => panic!("Expected ok result from audio direction response"),
510        };
511
512        let audio_direction_fut = channel.set_audio_priority(A2dpDirection::Sink);
513        let mut audio_direction_fut = pin!(audio_direction_fut);
514
515        assert!(exec.run_until_stalled(&mut audio_direction_fut).is_pending());
516
517        match exec.run_until_stalled(&mut direction_request_stream.next()) {
518            Poll::Ready(Some(Ok(bredr::AudioDirectionExtRequest::SetPriority {
519                priority,
520                responder,
521            }))) => {
522                assert_eq!(bredr::A2dpDirectionPriority::Sink, priority);
523                responder
524                    .send(Err(fidl_fuchsia_bluetooth::ErrorCode::Failed))
525                    .expect("response to send cleanly");
526            }
527            x => panic!("Expected a item to be ready on the request stream, got {:?}", x),
528        };
529
530        match exec.run_until_stalled(&mut audio_direction_fut) {
531            Poll::Ready(Err(_)) => {}
532            _x => panic!("Expected error result from audio direction response"),
533        };
534    }
535
536    #[test]
537    fn test_flush_timeout() {
538        let mut exec = fasync::TestExecutor::new();
539
540        let (remote, _local) = zx::Socket::create_datagram();
541        let no_ext = bredr::Channel {
542            socket: Some(remote),
543            channel_mode: Some(fidl_bt::ChannelMode::Basic),
544            max_tx_sdu_size: Some(1004),
545            flush_timeout: Some(50_000_000), // 50 milliseconds
546            ..Default::default()
547        };
548        let channel = Channel::try_from(no_ext).unwrap();
549
550        assert_eq!(Some(zx::MonotonicDuration::from_millis(50)), channel.flush_timeout());
551
552        // Within 2 milliseconds, doesn't change.
553        let res = exec.run_singlethreaded(
554            channel.set_flush_timeout(Some(zx::MonotonicDuration::from_millis(49))),
555        );
556        assert_eq!(Some(zx::MonotonicDuration::from_millis(50)), res.expect("shouldn't error"));
557        let res = exec.run_singlethreaded(
558            channel.set_flush_timeout(Some(zx::MonotonicDuration::from_millis(51))),
559        );
560        assert_eq!(Some(zx::MonotonicDuration::from_millis(50)), res.expect("shouldn't error"));
561
562        assert!(
563            exec.run_singlethreaded(
564                channel.set_flush_timeout(Some(zx::MonotonicDuration::from_millis(200)))
565            )
566            .is_err()
567        );
568        assert!(exec.run_singlethreaded(channel.set_flush_timeout(None)).is_err());
569
570        let (remote, _local) = zx::Socket::create_datagram();
571        let (client_end, mut l2cap_request_stream) =
572            create_request_stream::<bredr::L2capParametersExtMarker>();
573        let ext = bredr::Channel {
574            socket: Some(remote),
575            channel_mode: Some(fidl_bt::ChannelMode::Basic),
576            max_tx_sdu_size: Some(1004),
577            flush_timeout: None,
578            ext_l2cap: Some(client_end),
579            ..Default::default()
580        };
581
582        let channel = Channel::try_from(ext).unwrap();
583
584        {
585            let flush_timeout_fut = channel.set_flush_timeout(None);
586            let mut flush_timeout_fut = pin!(flush_timeout_fut);
587
588            // Requesting no change returns right away with no change.
589            match exec.run_until_stalled(&mut flush_timeout_fut) {
590                Poll::Ready(Ok(None)) => {}
591                x => panic!("Expected no flush timeout to not stall, got {:?}", x),
592            }
593        }
594
595        let req_duration = zx::MonotonicDuration::from_millis(42);
596
597        {
598            let flush_timeout_fut = channel.set_flush_timeout(Some(req_duration));
599            let mut flush_timeout_fut = pin!(flush_timeout_fut);
600
601            assert!(exec.run_until_stalled(&mut flush_timeout_fut).is_pending());
602
603            match exec.run_until_stalled(&mut l2cap_request_stream.next()) {
604                Poll::Ready(Some(Ok(bredr::L2capParametersExtRequest::RequestParameters {
605                    request,
606                    responder,
607                }))) => {
608                    assert_eq!(Some(req_duration.into_nanos()), request.flush_timeout);
609                    // Send a different response
610                    let params = fidl_bt::ChannelParameters {
611                        flush_timeout: Some(50_000_000), // 50ms
612                        ..Default::default()
613                    };
614                    responder.send(&params).expect("response to send cleanly");
615                }
616                x => panic!("Expected a item to be ready on the request stream, got {:?}", x),
617            };
618
619            match exec.run_until_stalled(&mut flush_timeout_fut) {
620                Poll::Ready(Ok(Some(duration))) => {
621                    assert_eq!(zx::MonotonicDuration::from_millis(50), duration)
622                }
623                x => panic!("Expected ready result from params response, got {:?}", x),
624            };
625        }
626
627        // Channel should have recorded the new flush timeout.
628        assert_eq!(Some(zx::MonotonicDuration::from_millis(50)), channel.flush_timeout());
629    }
630
631    #[test]
632    fn test_audio_offload() {
633        let _exec = fasync::TestExecutor::new();
634
635        let (remote, _local) = zx::Socket::create_datagram();
636        let no_ext = bredr::Channel {
637            socket: Some(remote),
638            channel_mode: Some(fidl_bt::ChannelMode::Basic),
639            max_tx_sdu_size: Some(1004),
640            ..Default::default()
641        };
642        let channel = Channel::try_from(no_ext).unwrap();
643
644        assert!(channel.audio_offload().is_none());
645
646        let (remote, _local) = zx::Socket::create_datagram();
647        let (client_end, mut _audio_offload_ext_req_stream) =
648            create_request_stream::<bredr::AudioOffloadExtMarker>();
649        let ext = bredr::Channel {
650            socket: Some(remote),
651            channel_mode: Some(fidl_bt::ChannelMode::Basic),
652            max_tx_sdu_size: Some(1004),
653            ext_audio_offload: Some(client_end),
654            ..Default::default()
655        };
656
657        let channel = Channel::try_from(ext).unwrap();
658
659        let offload_ext = channel.audio_offload();
660        assert!(offload_ext.is_some());
661        // We can get the audio offload multiple times without dropping
662        assert!(channel.audio_offload().is_some());
663        // And with dropping
664        drop(offload_ext);
665        assert!(channel.audio_offload().is_some());
666    }
667}
fuchsia_bluetooth/types/channel.rs

fuchsia_bluetooth/types/
channel.rs
