settings/input/
common.rs

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1// Copyright 2019 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.
4use crate::handler::base::Request;
5use crate::service_context::{ExternalServiceProxy, ServiceContext};
6use crate::{call, call_async};
7use anyhow::{format_err, Error};
8use fidl::endpoints::{create_proxy, create_request_stream};
9use fidl_fuchsia_camera3::{
10    DeviceMarker, DeviceProxy as Camera3DeviceProxy, DeviceWatcherMarker,
11    DeviceWatcherProxy as Camera3DeviceWatcherProxy, WatchDevicesEvent,
12};
13use fidl_fuchsia_ui_input::MediaButtonsEvent;
14use fidl_fuchsia_ui_policy::{
15    DeviceListenerRegistryMarker, MediaButtonsListenerMarker, MediaButtonsListenerRequest,
16};
17use fuchsia_async::{self as fasync, DurationExt};
18use futures::future::Fuse;
19use futures::{FutureExt, StreamExt};
20use std::rc::Rc;
21use zx::MonotonicDuration;
22
23/// The amount of time in milliseconds to wait for a camera device to be detected.
24pub const CAMERA_WATCHER_TIMEOUT: i64 = 30_000;
25
26/// Builder to simplify construction of fidl_fuchsia_ui_input::MediaButtonsEvent.
27/// # Example usage:
28/// ```
29/// MediaButtonsEventBuilder::new().set_mic_mute(true).build();
30/// ```
31#[cfg(test)]
32pub(crate) struct MediaButtonsEventBuilder {
33    mic_mute: bool,
34    camera_disable: bool,
35}
36
37#[cfg(test)]
38impl MediaButtonsEventBuilder {
39    pub(crate) fn new() -> Self {
40        // Create with defaults.
41        Self { mic_mute: false, camera_disable: false }
42    }
43
44    pub(crate) fn build(self) -> MediaButtonsEvent {
45        MediaButtonsEvent {
46            mic_mute: Some(self.mic_mute),
47            pause: Some(false),
48            camera_disable: Some(self.camera_disable),
49            ..Default::default()
50        }
51    }
52
53    pub(crate) fn set_mic_mute(mut self, mic_mute: bool) -> Self {
54        self.mic_mute = mic_mute;
55        self
56    }
57
58    pub(crate) fn set_camera_disable(mut self, camera_disable: bool) -> Self {
59        self.camera_disable = camera_disable;
60        self
61    }
62}
63
64/// Setting service internal representation of hw media buttons. Used to send
65/// OnButton events in the service.
66#[derive(PartialEq, Eq, Copy, Clone, Debug)]
67pub struct MediaButtons {
68    pub mic_mute: Option<bool>,
69    pub camera_disable: Option<bool>,
70}
71
72impl MediaButtons {
73    fn new() -> Self {
74        Self { mic_mute: None, camera_disable: None }
75    }
76
77    pub(crate) fn set_mic_mute(&mut self, mic_mute: Option<bool>) {
78        self.mic_mute = mic_mute;
79    }
80
81    pub(crate) fn set_camera_disable(&mut self, camera_disable: Option<bool>) {
82        self.camera_disable = camera_disable;
83    }
84}
85
86impl From<MediaButtonsEvent> for MediaButtons {
87    fn from(event: MediaButtonsEvent) -> Self {
88        let mut buttons = MediaButtons::new();
89
90        if let Some(mic_mute) = event.mic_mute {
91            buttons.set_mic_mute(Some(mic_mute));
92        }
93        if let Some(camera_disable) = event.camera_disable {
94            buttons.set_camera_disable(Some(camera_disable));
95        }
96
97        buttons
98    }
99}
100
101impl From<MediaButtons> for Request {
102    fn from(event: MediaButtons) -> Self {
103        Request::OnButton(event)
104    }
105}
106
107/// Method for listening to media button changes. Changes will be reported back
108/// on the supplied sender.
109pub(crate) async fn monitor_media_buttons(
110    service_context_handle: Rc<ServiceContext>,
111    sender: futures::channel::mpsc::UnboundedSender<MediaButtonsEvent>,
112) -> Result<(), Error> {
113    let presenter_service =
114        service_context_handle.connect::<DeviceListenerRegistryMarker>().await?;
115    let (client_end, mut stream) = create_request_stream::<MediaButtonsListenerMarker>();
116
117    // TODO(https://fxbug.dev/42058092) This independent spawn is necessary! For some reason removing this or
118    // merging it with the spawn below causes devices to lock up on input button events. Figure out
119    // whether this can be removed or left as-is as part of the linked bug.
120    fasync::Task::local(async move {
121        if let Err(error) = call_async!(presenter_service => register_listener(client_end)).await {
122            log::error!(
123                "Registering media button listener with presenter service failed {:?}",
124                error
125            );
126        }
127    })
128    .detach();
129
130    fasync::Task::local(async move {
131        while let Some(Ok(media_request)) = stream.next().await {
132            // Support future expansion of FIDL
133            #[allow(clippy::single_match)]
134            #[allow(unreachable_patterns)]
135            match media_request {
136                MediaButtonsListenerRequest::OnEvent { event, responder } => {
137                    sender
138                        .unbounded_send(event)
139                        .expect("Media buttons sender failed to send event");
140                    // Acknowledge the event.
141                    responder
142                        .send()
143                        .unwrap_or_else(|_| log::error!("Failed to ack media buttons event"));
144                }
145                _ => {}
146            }
147        }
148    })
149    .detach();
150
151    Ok(())
152}
153
154/// Connects to the fuchsia.camera3.DeviceWatcher api.
155async fn connect_to_camera_watcher(
156    service_context_handle: Rc<ServiceContext>,
157) -> Result<ExternalServiceProxy<Camera3DeviceWatcherProxy>, Error> {
158    service_context_handle.connect::<DeviceWatcherMarker>().await
159}
160
161/// Retrieves the id of a camera device given the camera device watcher proxy.
162async fn get_camera_id(
163    camera_watcher_proxy: &ExternalServiceProxy<Camera3DeviceWatcherProxy>,
164) -> Result<u64, Error> {
165    // Get a list of id structs containing existing, new, and removed ids.
166
167    // Sets a timer and watches for changes from the camera api. If the first response is empty,
168    // continue to watch for an update to the devices. If we receive a nonempty response,
169    // we extract the id and return. If the timeout is reached, then it is assumed to be an error.
170    let timer =
171        fasync::Timer::new(MonotonicDuration::from_millis(CAMERA_WATCHER_TIMEOUT).after_now())
172            .fuse();
173    let camera_ids = call_async!(camera_watcher_proxy => watch_devices()).fuse();
174
175    // Used to add the second watch call if the first comes back with empty devices.
176    let unfulfilled_future = Fuse::terminated();
177
178    futures::pin_mut!(timer, camera_ids, unfulfilled_future);
179    loop {
180        futures::select! {
181            ids_result = camera_ids => {
182                let ids = ids_result?;
183                if ids.is_empty() {
184                    // The camera list might not be initialized yet, make another watch call and
185                    // keep waiting.
186                    let next_camera_ids = call_async!(camera_watcher_proxy => watch_devices()).fuse();
187                    unfulfilled_future.set(next_camera_ids);
188                } else {
189                    // Nonempty response, extract id.
190                    return extract_cam_id(ids);
191                }
192            }
193            ids_result_second = unfulfilled_future => {
194                let ids = ids_result_second?;
195                return extract_cam_id(ids);
196            }
197            _ = timer => {
198                return Err(format_err!("Could not find a camera"));
199            }
200        }
201    }
202}
203
204/// Extract the camera id from the list of ids. Assumes there is only one camera.
205fn extract_cam_id(ids: Vec<WatchDevicesEvent>) -> Result<u64, Error> {
206    let first_cam = ids.first();
207    if let Some(WatchDevicesEvent::Existing(id)) | Some(WatchDevicesEvent::Added(id)) = first_cam {
208        Ok(*id)
209    } else {
210        Err(format_err!("Could not find a camera"))
211    }
212}
213
214/// Establishes a connection to the fuchsia.camera3.Device api by watching
215/// the camera id and using it to connect to the device.
216pub(crate) async fn connect_to_camera(
217    service_context_handle: Rc<ServiceContext>,
218) -> Result<Camera3DeviceProxy, Error> {
219    // Connect to the camera device watcher to get camera ids. This will
220    // be used to connect to the camera.
221    let camera_watcher_proxy = connect_to_camera_watcher(service_context_handle).await?;
222    let camera_id = get_camera_id(&camera_watcher_proxy).await?;
223
224    // Connect to the camera device with the found id.
225    let (camera_proxy, device_server) = create_proxy::<DeviceMarker>();
226    if call!(camera_watcher_proxy => connect_to_device(camera_id, device_server)).is_err() {
227        return Err(format_err!("Could not connect to fuchsia.camera3.DeviceWatcher device"));
228    }
229    Ok(camera_proxy)
230}
settings/input/common.rs

settings/input/
common.rs
