input_pipeline_dso/
input_pipeline.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 crate::display_ownership::DisplayOwnership;
6use crate::focus_listener::FocusListener;
7use crate::input_device::{InputEventType, InputPipelineFeatureFlags};
8use crate::input_handler::Handler;
9use crate::{Dispatcher, Incoming, Transport, dispatcher, input_device, input_handler, metrics};
10use anyhow::{Context, Error, format_err};
11use fidl::endpoints;
12use fidl_fuchsia_io as fio;
13use focus_chain_provider::FocusChainProviderPublisher;
14use fuchsia_async as fasync;
15use fuchsia_component::directory::AsRefDirectory;
16use fuchsia_fs::directory::{WatchEvent, Watcher};
17use fuchsia_inspect::NumericProperty;
18use fuchsia_inspect::health::Reporter;
19use fuchsia_sync::Mutex;
20use futures::channel::mpsc::{self, UnboundedReceiver, UnboundedSender};
21use futures::future::LocalBoxFuture;
22use futures::{StreamExt, TryStreamExt};
23use itertools::Itertools;
24use metrics_registry::*;
25use sorted_vec_map::SortedVecMap;
26use std::path::Path;
27use std::rc::Rc;
28use std::sync::atomic::{AtomicU32, Ordering};
29use std::sync::{Arc, LazyLock};
30use strum::EnumCount;
31
32/// Use a self incremental u32 unique id for device_id.
33///
34/// device id start from 10 to avoid conflict with default devices in Starnix.
35/// Currently, Starnix using 0 and 1 as default devices' id. Starnix need to
36/// use default devices to deliver events from physical devices until we have
37/// API to expose device changes to UI clients.
38static NEXT_DEVICE_ID: LazyLock<AtomicU32> = LazyLock::new(|| AtomicU32::new(10));
39
40/// Each time this function is invoked, it returns the current value of its
41/// internal counter (serving as a unique id for device_id) and then increments
42/// that counter in preparation for the next call.
43fn get_next_device_id() -> u32 {
44    NEXT_DEVICE_ID.fetch_add(1, Ordering::SeqCst)
45}
46
47type BoxedInputDeviceBinding = Box<dyn input_device::InputDeviceBinding>;
48
49/// An [`InputDeviceBindingMap`] maps an input device to one or more InputDeviceBindings.
50/// It uses unique device id as key.
51pub type InputDeviceBindingMap = Arc<Mutex<SortedVecMap<u32, Vec<BoxedInputDeviceBinding>>>>;
52
53/// An input pipeline assembly.
54///
55/// Represents a partial stage of the input pipeline which accepts inputs through an asynchronous
56/// sender channel, and emits outputs through an asynchronous receiver channel.  Use [new] to
57/// create a new assembly.  Use [add_handler], or [add_all_handlers] to add the input pipeline
58/// handlers to use.  When done, [InputPipeline::new] can be used to make a new input pipeline.
59///
60/// # Implementation notes
61///
62/// Internally, when a new [InputPipelineAssembly] is created with multiple [InputHandler]s, the
63/// handlers are connected together using async queues.  This allows fully streamed processing of
64/// input events, and also allows some pipeline stages to generate events spontaneously, i.e.
65/// without an external stimulus.
66pub struct InputPipelineAssembly {
67    /// The top-level sender: send into this queue to inject an event into the input
68    /// pipeline.
69    sender: UnboundedSender<Vec<input_device::InputEvent>>,
70    /// The bottom-level receiver: any events that fall through the entire pipeline can
71    /// be read from this receiver.
72    receiver: UnboundedReceiver<Vec<input_device::InputEvent>>,
73
74    /// The input handlers that comprise the input pipeline.
75    handlers: Vec<Rc<dyn input_handler::BatchInputHandler>>,
76
77    /// The display ownership watcher task.
78    display_ownership_fut: Option<LocalBoxFuture<'static, ()>>,
79
80    /// The focus listener task.
81    focus_listener_fut: Option<LocalBoxFuture<'static, ()>>,
82
83    /// The metrics logger.
84    metrics_logger: metrics::MetricsLogger,
85}
86
87impl InputPipelineAssembly {
88    /// Create a new but empty [InputPipelineAssembly]. Use [add_handler] or similar
89    /// to add new handlers to it.
90    pub fn new(metrics_logger: metrics::MetricsLogger) -> Self {
91        let (sender, receiver) = mpsc::unbounded();
92        InputPipelineAssembly {
93            sender,
94            receiver,
95            handlers: vec![],
96            metrics_logger,
97            display_ownership_fut: None,
98            focus_listener_fut: None,
99        }
100    }
101
102    /// Adds another [input_handler::BatchInputHandler] into the [InputPipelineAssembly]. The handlers
103    /// are invoked in the order they are added. Returns `Self` for chaining.
104    pub fn add_handler(mut self, handler: Rc<dyn input_handler::BatchInputHandler>) -> Self {
105        self.handlers.push(handler);
106        self
107    }
108
109    /// Adds all handlers into the assembly in the order they appear in `handlers`.
110    pub fn add_all_handlers(self, handlers: Vec<Rc<dyn input_handler::BatchInputHandler>>) -> Self {
111        handlers.into_iter().fold(self, |assembly, handler| assembly.add_handler(handler))
112    }
113
114    pub fn add_display_ownership(
115        mut self,
116        display_ownership_event: zx::Event,
117        input_handlers_node: &fuchsia_inspect::Node,
118    ) -> InputPipelineAssembly {
119        let h = DisplayOwnership::new(
120            display_ownership_event,
121            input_handlers_node,
122            self.metrics_logger.clone(),
123        );
124        let metrics_logger_clone = self.metrics_logger.clone();
125        let h_clone = h.clone();
126        let sender_clone = self.sender.clone();
127        let display_ownership_fut = Box::pin(async move {
128            h_clone.clone().set_handler_healthy();
129            h_clone.clone()
130                .handle_ownership_change(sender_clone)
131                .await
132                .map_err(|e| {
133                    metrics_logger_clone.log_error(
134                        InputPipelineErrorMetricDimensionEvent::InputPipelineDisplayOwnershipIsNotSupposedToTerminate,
135                        std::format!(
136                            "display ownership is not supposed to terminate - this is likely a problem: {:?}", e));
137                        })
138                        .unwrap();
139            h_clone.set_handler_unhealthy("Receive loop terminated for handler: DisplayOwnership");
140        });
141        self.display_ownership_fut = Some(display_ownership_fut);
142        self.add_handler(h)
143    }
144
145    /// Deconstructs the assembly into constituent components, used when constructing
146    /// [InputPipeline].
147    ///
148    /// You should call [catch_unhandled] on the returned [async_channel::Receiver], and
149    /// [run] on the returned [fuchsia_async::Tasks] (or supply own equivalents).
150    fn into_components(
151        self,
152    ) -> (
153        UnboundedSender<Vec<input_device::InputEvent>>,
154        UnboundedReceiver<Vec<input_device::InputEvent>>,
155        Vec<Rc<dyn input_handler::BatchInputHandler>>,
156        metrics::MetricsLogger,
157        Option<LocalBoxFuture<'static, ()>>,
158        Option<LocalBoxFuture<'static, ()>>,
159    ) {
160        (
161            self.sender,
162            self.receiver,
163            self.handlers,
164            self.metrics_logger,
165            self.display_ownership_fut,
166            self.focus_listener_fut,
167        )
168    }
169
170    pub fn add_focus_listener(
171        mut self,
172        incoming: &Incoming,
173        focus_chain_publisher: FocusChainProviderPublisher,
174    ) -> Self {
175        let metrics_logger_clone = self.metrics_logger.clone();
176        let incoming2 = incoming.clone();
177        let focus_listener_fut = Box::pin(async move {
178            if let Ok(mut focus_listener) = FocusListener::new(
179                &incoming2,
180                focus_chain_publisher,
181                metrics_logger_clone,
182            )
183            .map_err(|e| {
184                log::warn!("could not create focus listener, focus will not be dispatched: {:?}", e)
185            }) {
186                // This will await indefinitely and process focus messages in a loop, unless there
187                // is a problem.
188                let _result = focus_listener
189                    .dispatch_focus_changes()
190                    .await
191                    .map(|_| {
192                        log::warn!("dispatch focus loop ended, focus will no longer be dispatched")
193                    })
194                    .map_err(|e| {
195                        panic!("could not dispatch focus changes, this is a fatal error: {:?}", e)
196                    });
197            }
198        });
199        self.focus_listener_fut = Some(focus_listener_fut);
200        self
201    }
202}
203
204/// An [`InputPipeline`] manages input devices and propagates input events through input handlers.
205///
206/// On creation, clients declare what types of input devices an [`InputPipeline`] manages. The
207/// [`InputPipeline`] will continuously detect new input devices of supported type(s).
208///
209/// # Example
210/// ```
211/// let ime_handler =
212///     ImeHandler::new(scene_manager.session.clone(), scene_manager.compositor_id).await?;
213/// let touch_handler = TouchHandler::new(
214///     scene_manager.session.clone(),
215///     scene_manager.compositor_id,
216///     scene_manager.display_size
217/// ).await?;
218///
219/// let assembly = InputPipelineAssembly::new()
220///     .add_handler(Box::new(ime_handler)),
221///     .add_handler(Box::new(touch_handler)),
222/// let input_pipeline = InputPipeline::new(
223///     vec![
224///         input_device::InputDeviceType::Touch,
225///         input_device::InputDeviceType::Keyboard,
226///     ],
227///     assembly,
228/// );
229/// input_pipeline.handle_input_events().await;
230/// ```
231pub struct InputPipeline {
232    /// The entry point into the input handler pipeline. Incoming input events should
233    /// be inserted into this async queue, and the input pipeline will ensure that they
234    /// are propagated through all the input handlers in the appropriate sequence.
235    pipeline_sender: UnboundedSender<Vec<input_device::InputEvent>>,
236
237    /// A clone of this sender is given to every InputDeviceBinding that this pipeline owns.
238    /// Each InputDeviceBinding will send InputEvents to the pipeline through this channel.
239    device_event_sender: UnboundedSender<Vec<input_device::InputEvent>>,
240
241    /// Receives InputEvents from all InputDeviceBindings that this pipeline owns.
242    device_event_receiver: UnboundedReceiver<Vec<input_device::InputEvent>>,
243
244    /// The types of devices this pipeline supports.
245    input_device_types: Vec<input_device::InputDeviceType>,
246
247    /// The InputDeviceBindings bound to this pipeline.
248    input_device_bindings: InputDeviceBindingMap,
249
250    /// This node is bound to the lifetime of this InputPipeline.
251    /// Inspect data will be dumped for this pipeline as long as it exists.
252    inspect_node: fuchsia_inspect::Node,
253
254    /// The metrics logger.
255    metrics_logger: metrics::MetricsLogger,
256
257    /// The feature flags for the input pipeline.
258    pub feature_flags: input_device::InputPipelineFeatureFlags,
259
260    /// Tasks running in the background on the Dispatcher.
261    _tasks: Vec<dispatcher::TaskHandle<()>>,
262
263    /// Tasks running in the background on fuchsia_async dispatcher.
264    _fasync_tasks: Vec<fasync::Task<()>>,
265}
266
267impl InputPipeline {
268    fn new_common(
269        input_device_types: Vec<input_device::InputDeviceType>,
270        assembly: InputPipelineAssembly,
271        inspect_node: fuchsia_inspect::Node,
272        feature_flags: input_device::InputPipelineFeatureFlags,
273    ) -> Self {
274        let (
275            pipeline_sender,
276            receiver,
277            handlers,
278            metrics_logger,
279            display_ownership_fut,
280            focus_listener_fut,
281        ) = assembly.into_components();
282
283        let mut tasks = vec![];
284        let mut fasync_tasks = vec![];
285
286        let mut handlers_count = handlers.len();
287        // TODO: b/469745447 - should use futures::select! instead of spawning tasks.
288        if let Some(fut) = display_ownership_fut {
289            // The displayer ownership handler, like all input handlers, runs on [`crate::Dispatcher`]
290            // which is driver dispatcher in dso mode. The display ownership future must run on
291            // the same dispatcher because the types do not support multithreaded access.
292            tasks.push(Dispatcher::spawn_local(fut));
293            handlers_count += 1;
294        }
295
296        // TODO: b/469745447 - should use futures::select! instead of spawning tasks.
297        if let Some(fut) = focus_listener_fut {
298            fasync_tasks.push(fasync::Task::local(fut));
299            handlers_count += 1;
300        }
301
302        // Add properties to inspect node
303        inspect_node.record_string("supported_input_devices", input_device_types.iter().join(", "));
304        inspect_node.record_uint("handlers_registered", handlers_count as u64);
305        inspect_node.record_uint("handlers_healthy", handlers_count as u64);
306
307        // Initializes all handlers and starts the input pipeline loop.
308        let runner_task = InputPipeline::run(receiver, handlers, metrics_logger.clone());
309        tasks.push(runner_task);
310
311        let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
312        let input_device_bindings: InputDeviceBindingMap =
313            Arc::new(Mutex::new(SortedVecMap::new()));
314        InputPipeline {
315            pipeline_sender,
316            device_event_sender,
317            device_event_receiver,
318            input_device_types,
319            input_device_bindings,
320            inspect_node,
321            metrics_logger,
322            feature_flags,
323            _tasks: tasks,
324            _fasync_tasks: fasync_tasks,
325        }
326    }
327
328    /// Creates a new [`InputPipeline`] for integration testing.
329    /// Unlike a production input pipeline, this pipeline will not monitor
330    /// `/svc/fuchsia.input.report.Service` for devices.
331    ///
332    /// # Parameters
333    /// - `input_device_types`: The types of devices the new [`InputPipeline`] will support.
334    /// - `assembly`: The input handlers that the [`InputPipeline`] sends InputEvents to.
335    pub fn new_for_test(
336        input_device_types: Vec<input_device::InputDeviceType>,
337        assembly: InputPipelineAssembly,
338    ) -> Self {
339        let inspector = fuchsia_inspect::Inspector::default();
340        let root = inspector.root();
341        let test_node = root.create_child("input_pipeline");
342        Self::new_common(
343            input_device_types,
344            assembly,
345            test_node,
346            input_device::InputPipelineFeatureFlags { enable_merge_touch_events: false },
347        )
348    }
349
350    /// Creates a new [`InputPipeline`] for production use.
351    ///
352    /// # Parameters
353    /// - `input_device_types`: The types of devices the new [`InputPipeline`] will support.
354    /// - `assembly`: The input handlers that the [`InputPipeline`] sends InputEvents to.
355    /// - `inspect_node`: The root node for InputPipeline's Inspect tree
356    pub fn new(
357        incoming: &Incoming,
358        input_device_types: Vec<input_device::InputDeviceType>,
359        assembly: InputPipelineAssembly,
360        inspect_node: fuchsia_inspect::Node,
361        feature_flags: input_device::InputPipelineFeatureFlags,
362        metrics_logger: metrics::MetricsLogger,
363    ) -> Result<Self, Error> {
364        let mut input_pipeline =
365            Self::new_common(input_device_types, assembly, inspect_node, feature_flags);
366        let input_device_types = input_pipeline.input_device_types.clone();
367        let input_event_sender = input_pipeline.device_event_sender.clone();
368        let input_device_bindings = input_pipeline.input_device_bindings.clone();
369        let devices_node = input_pipeline.inspect_node.create_child("input_devices");
370        let feature_flags = input_pipeline.feature_flags.clone();
371        let incoming = incoming.clone();
372        // This intentionally uses the [`fuchsia_async`] task dispatcher instead of
373        // [`crate::Dispatcher`] -- the directory watcher always uses the fuchsia-async dispatcher.
374        // This is fine for performance because the actual event dispatch is still configured to
375        // run on [`crate::Dispatcher`].
376        let watcher_task = fasync::Task::local(async move {
377            // Watches the input device directory for new input devices. Creates new InputDeviceBindings
378            // that send InputEvents to `input_event_receiver`.
379            match async {
380                let (dir_proxy, server) = endpoints::create_proxy::<fio::DirectoryMarker>();
381                incoming
382                    .as_ref_directory()
383                    .open(input_device::INPUT_REPORT_PATH, fio::PERM_READABLE, server.into())
384                    .with_context(|| {
385                        format!("failed to open {}", input_device::INPUT_REPORT_PATH)
386                    })?;
387                let device_watcher =
388                    Watcher::new(&dir_proxy).await.context("failed to create watcher")?;
389                Self::watch_for_devices(
390                    device_watcher,
391                    dir_proxy,
392                    &input_device_types,
393                    input_event_sender,
394                    input_device_bindings,
395                    &devices_node,
396                    false, /* break_on_idle */
397                    feature_flags,
398                    metrics_logger.clone(),
399                )
400                .await
401                .context("failed to watch for devices")
402            }
403            .await
404            {
405                Ok(()) => {}
406                Err(err) => {
407                    // This error is usually benign in tests: it means that the setup does not
408                    // support dynamic device discovery. Almost no tests support dynamic
409                    // device discovery, and they also do not need those.
410                    metrics_logger.log_warn(
411                        InputPipelineErrorMetricDimensionEvent::InputPipelineUnableToWatchForNewInputDevices,
412                        std::format!(
413                            "Input pipeline is unable to watch for new input devices: {:?}",
414                            err
415                        ));
416                }
417            }
418        });
419        input_pipeline._fasync_tasks.push(watcher_task);
420
421        Ok(input_pipeline)
422    }
423
424    /// Gets the input device bindings.
425    pub fn input_device_bindings(&self) -> &InputDeviceBindingMap {
426        &self.input_device_bindings
427    }
428
429    /// Gets the input device sender: this is the channel that should be cloned
430    /// and used for injecting events from the drivers into the input pipeline.
431    pub fn input_event_sender(&self) -> &UnboundedSender<Vec<input_device::InputEvent>> {
432        &self.device_event_sender
433    }
434
435    /// Gets a list of input device types supported by this input pipeline.
436    pub fn input_device_types(&self) -> &[input_device::InputDeviceType] {
437        &self.input_device_types
438    }
439
440    /// Forwards all input events into the input pipeline.
441    pub async fn handle_input_events(mut self) {
442        let metrics_logger_clone = self.metrics_logger.clone();
443        while let Some(input_event) = self.device_event_receiver.next().await {
444            if let Err(e) = self.pipeline_sender.unbounded_send(input_event) {
445                metrics_logger_clone.log_error(
446                    InputPipelineErrorMetricDimensionEvent::InputPipelineCouldNotForwardEventFromDriver,
447                    std::format!("could not forward event from driver: {:?}", e));
448            }
449        }
450
451        metrics_logger_clone.log_error(
452            InputPipelineErrorMetricDimensionEvent::InputPipelineStopHandlingEvents,
453            "Input pipeline stopped handling input events.".to_string(),
454        );
455    }
456
457    /// Watches the input report service directory for new input devices. Creates InputDeviceBindings
458    /// if new devices match a type in `device_types`.
459    ///
460    /// # Parameters
461    /// - `device_watcher`: Watches the input report service directory for new devices.
462    /// - `dir_proxy`: The directory containing InputDevice connections.
463    /// - `device_types`: The types of devices to watch for.
464    /// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
465    /// - `bindings`: Holds all the InputDeviceBindings
466    /// - `input_devices_node`: The parent node for all device bindings' inspect nodes.
467    /// - `break_on_idle`: If true, stops watching for devices once all existing devices are handled.
468    /// - `metrics_logger`: The metrics logger.
469    ///
470    /// # Errors
471    /// If the input report service directory or a file within it cannot be read.
472    async fn watch_for_devices(
473        mut device_watcher: Watcher,
474        dir_proxy: fio::DirectoryProxy,
475        device_types: &[input_device::InputDeviceType],
476        input_event_sender: UnboundedSender<Vec<input_device::InputEvent>>,
477        bindings: InputDeviceBindingMap,
478        input_devices_node: &fuchsia_inspect::Node,
479        break_on_idle: bool,
480        feature_flags: input_device::InputPipelineFeatureFlags,
481        metrics_logger: metrics::MetricsLogger,
482    ) -> Result<(), Error> {
483        // Add non-static properties to inspect node.
484        let devices_discovered = input_devices_node.create_uint("devices_discovered", 0);
485        let devices_connected = input_devices_node.create_uint("devices_connected", 0);
486        while let Some(msg) = device_watcher.try_next().await? {
487            if let Ok(instance_name) = msg.filename.into_os_string().into_string() {
488                if instance_name == "." {
489                    continue;
490                }
491
492                match msg.event {
493                    WatchEvent::EXISTING | WatchEvent::ADD_FILE => {
494                        log::info!("found input device {}", instance_name);
495                        devices_discovered.add(1);
496                        let device_path = Path::new(&instance_name).join("input_device");
497                        let device_proxy = match input_device::get_device_from_dir_entry_path(
498                            &dir_proxy,
499                            &device_path,
500                        ) {
501                            Ok(proxy) => proxy,
502                            Err(e) => {
503                                log::error!(
504                                    "Failed to connect to input device {}: {:?}",
505                                    instance_name,
506                                    e
507                                );
508                                continue;
509                            }
510                        };
511                        add_device_bindings(
512                            device_types,
513                            &instance_name,
514                            device_proxy,
515                            &input_event_sender,
516                            &bindings,
517                            get_next_device_id(),
518                            input_devices_node,
519                            Some(&devices_connected),
520                            feature_flags.clone(),
521                            metrics_logger.clone(),
522                        )
523                        .await;
524                    }
525                    WatchEvent::IDLE => {
526                        if break_on_idle {
527                            break;
528                        }
529                    }
530                    _ => (),
531                }
532            }
533        }
534        // Ensure inspect properties persist for debugging if device watch loop ends.
535        input_devices_node.record(devices_discovered);
536        input_devices_node.record(devices_connected);
537        Err(format_err!("Input pipeline stopped watching for new input devices."))
538    }
539
540    /// Handles the incoming InputDeviceRegistryRequestStream.
541    ///
542    /// This method will end when the request stream is closed. If the stream closes with an
543    /// error the error will be returned in the Result.
544    ///
545    /// **NOTE**: Only one stream is handled at a time. https://fxbug.dev/42061078
546    ///
547    /// # Parameters
548    /// - `stream`: The stream of InputDeviceRegistryRequests.
549    /// - `device_types`: The types of devices to watch for.
550    /// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
551    /// - `bindings`: Holds all the InputDeviceBindings associated with the InputPipeline.
552    /// - `input_devices_node`: The parent node for all injected devices' inspect nodes.
553    /// - `metrics_logger`: The metrics logger.
554    pub async fn handle_input_device_registry_request_stream(
555        mut stream: fidl_fuchsia_input_injection::InputDeviceRegistryRequestStream,
556        device_types: &[input_device::InputDeviceType],
557        input_event_sender: &UnboundedSender<Vec<input_device::InputEvent>>,
558        bindings: &InputDeviceBindingMap,
559        input_devices_node: &fuchsia_inspect::Node,
560        feature_flags: input_device::InputPipelineFeatureFlags,
561        metrics_logger: metrics::MetricsLogger,
562    ) -> Result<(), Error> {
563        while let Some(request) = stream
564            .try_next()
565            .await
566            .context("Error handling input device registry request stream")?
567        {
568            match request {
569                fidl_fuchsia_input_injection::InputDeviceRegistryRequest::Register {
570                    device,
571                    ..
572                } => {
573                    // Add a binding if the device is a type being tracked
574                    let device = fidl_next::ClientEnd::<
575                        fidl_next_fuchsia_input_report::InputDevice,
576                        zx::Channel,
577                    >::from_untyped(device.into_channel());
578                    let device = Dispatcher::client_from_zx_channel(device);
579                    let device = device.spawn();
580                    let device_id = get_next_device_id();
581
582                    add_device_bindings(
583                        device_types,
584                        &format!("input-device-registry-{}", device_id),
585                        device,
586                        input_event_sender,
587                        bindings,
588                        device_id,
589                        input_devices_node,
590                        None,
591                        feature_flags.clone(),
592                        metrics_logger.clone(),
593                    )
594                    .await;
595                }
596                fidl_fuchsia_input_injection::InputDeviceRegistryRequest::RegisterAndGetDeviceInfo {
597                    device,
598                    responder,
599                    .. } => {
600                    // Add a binding if the device is a type being tracked
601                    let device = fidl_next::ClientEnd::<
602                        fidl_next_fuchsia_input_report::InputDevice,
603                        zx::Channel,
604                    >::from_untyped(device.into_channel());
605                    let device = Dispatcher::client_from_zx_channel(device);
606                    let device = device.spawn();
607                    let device_id = get_next_device_id();
608
609                    add_device_bindings(
610                        device_types,
611                        &format!("input-device-registry-{}", device_id),
612                        device,
613                        input_event_sender,
614                        bindings,
615                        device_id,
616                        input_devices_node,
617                        None,
618                        feature_flags.clone(),
619                        metrics_logger.clone(),
620                    )
621                    .await;
622
623                    responder.send(fidl_fuchsia_input_injection::InputDeviceRegistryRegisterAndGetDeviceInfoResponse{
624                        device_id: Some(device_id),
625                        ..Default::default()
626                    }).expect("Failed to respond to RegisterAndGetDeviceInfo request");
627                }
628            }
629        }
630
631        Ok(())
632    }
633
634    /// Initializes all handlers and starts the input pipeline loop in an asynchronous executor.
635    fn run(
636        mut receiver: UnboundedReceiver<Vec<input_device::InputEvent>>,
637        handlers: Vec<Rc<dyn input_handler::BatchInputHandler>>,
638        metrics_logger: metrics::MetricsLogger,
639    ) -> dispatcher::TaskHandle<()> {
640        Dispatcher::spawn_local(async move {
641            for handler in &handlers {
642                handler.clone().set_handler_healthy();
643            }
644
645            let mut handlers_by_type: [Vec<Rc<dyn input_handler::BatchInputHandler>>;
646                InputEventType::COUNT] = Default::default();
647
648            // TODO: b/478262850 - We can use supported_input_devices to populate this list.
649            let event_types = vec![
650                InputEventType::Keyboard,
651                InputEventType::LightSensor,
652                InputEventType::ConsumerControls,
653                InputEventType::Mouse,
654                InputEventType::TouchScreen,
655                InputEventType::Touchpad,
656                #[cfg(test)]
657                InputEventType::Fake,
658            ];
659
660            for event_type in event_types {
661                let handlers_for_type: Vec<Rc<dyn input_handler::BatchInputHandler>> = handlers
662                    .iter()
663                    .filter(|h| h.interest().contains(&event_type))
664                    .cloned()
665                    .collect();
666                handlers_by_type[event_type as usize] = handlers_for_type;
667            }
668
669            while let Some(events) = receiver.next().await {
670                if events.is_empty() {
671                    continue;
672                }
673
674                let mut groups_seen = 0;
675                let events = events.into_iter().chunk_by(|e| InputEventType::from(&e.device_event));
676                let events = events.into_iter().map(|(k, v)| (k, v.collect::<Vec<_>>()));
677                for (event_type, event_group) in events {
678                    groups_seen += 1;
679                    if groups_seen == 2 {
680                        metrics_logger.log_error(
681                                InputPipelineErrorMetricDimensionEvent::InputFrameContainsMultipleTypesOfEvents,
682                                "it is not recommended to contain multiple types of events in 1 send".to_string(),
683                            );
684                    }
685                    let mut events_in_group = event_group;
686
687                    // Get pre-computed handlers for this event type.
688                    let handlers = &handlers_by_type[event_type as usize];
689
690                    for handler in handlers {
691                        events_in_group =
692                            handler.clone().handle_input_events(events_in_group).await;
693                    }
694
695                    for event in events_in_group {
696                        if event.handled == input_device::Handled::No {
697                            log::warn!("unhandled input event: {:?}", event);
698                        }
699                        if let Some(trace_id) = event.trace_id {
700                            fuchsia_trace::flow_end!(
701                                "input",
702                                "event_in_input_pipeline",
703                                trace_id.into()
704                            );
705                        }
706                    }
707                }
708            }
709            for handler in &handlers {
710                handler.clone().set_handler_unhealthy("Pipeline loop terminated");
711            }
712            panic!("Runner task is not supposed to terminate.")
713        })
714    }
715}
716
717/// Adds `InputDeviceBinding`s to `bindings` for all `device_types` exposed by `device_proxy`.
718///
719/// # Parameters
720/// - `device_types`: The types of devices to watch for.
721/// - `device_proxy`: A proxy to the input device.
722/// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
723/// - `bindings`: Holds all the InputDeviceBindings associated with the InputPipeline.
724/// - `device_id`: The device id of the associated bindings.
725/// - `input_devices_node`: The parent node for all device bindings' inspect nodes.
726///
727/// # Note
728/// This will create multiple bindings, in the case where
729/// * `device_proxy().get_descriptor()` returns a `fidl_fuchsia_input_report::DeviceDescriptor`
730///   with multiple table fields populated, and
731/// * multiple populated table fields correspond to device types present in `device_types`
732///
733/// This is used, for example, to support the Atlas touchpad. In that case, a single
734/// instance of `fuchsia.input.report.Service` provides both a `fuchsia.input.report.MouseDescriptor` and
735/// a `fuchsia.input.report.TouchDescriptor`.
736async fn add_device_bindings(
737    device_types: &[input_device::InputDeviceType],
738    instance_name: &str,
739    device_proxy: fidl_next::Client<fidl_next_fuchsia_input_report::InputDevice, Transport>,
740    input_event_sender: &UnboundedSender<Vec<input_device::InputEvent>>,
741    bindings: &InputDeviceBindingMap,
742    device_id: u32,
743    input_devices_node: &fuchsia_inspect::Node,
744    devices_connected: Option<&fuchsia_inspect::UintProperty>,
745    feature_flags: InputPipelineFeatureFlags,
746    metrics_logger: metrics::MetricsLogger,
747) {
748    let mut matched_device_types = vec![];
749    if let Ok(res) = device_proxy.get_descriptor().await {
750        for device_type in device_types {
751            if input_device::is_device_type(&res.descriptor, *device_type).await {
752                matched_device_types.push(device_type);
753                match devices_connected {
754                    Some(dev_connected) => {
755                        let _ = dev_connected.add(1);
756                    }
757                    None => (),
758                };
759            }
760        }
761        if matched_device_types.is_empty() {
762            log::info!(
763                "device {} did not match any supported device types: {:?}",
764                instance_name,
765                device_types
766            );
767            let device_node =
768                input_devices_node.create_child(format!("{}_Unsupported", instance_name));
769            let mut health = fuchsia_inspect::health::Node::new(&device_node);
770            health.set_unhealthy("Unsupported device type.");
771            device_node.record(health);
772            input_devices_node.record(device_node);
773            return;
774        }
775    } else {
776        metrics_logger.clone().log_error(
777            InputPipelineErrorMetricDimensionEvent::InputPipelineNoDeviceDescriptor,
778            std::format!("cannot bind device {} without a device descriptor", instance_name),
779        );
780        return;
781    }
782
783    log::info!(
784        "binding {} to device types: {}",
785        instance_name,
786        matched_device_types
787            .iter()
788            .fold(String::new(), |device_types_string, device_type| device_types_string
789                + &format!("{:?}, ", device_type))
790    );
791
792    let mut new_bindings: Vec<BoxedInputDeviceBinding> = vec![];
793    for device_type in matched_device_types {
794        // Clone `device_proxy`, so that multiple bindings (e.g. a `MouseBinding` and a
795        // `TouchBinding`) can read data from the same `fuchsia.input.report.Service` instance.
796        //
797        // There's no conflict in having multiple bindings read from the same node,
798        // since:
799        // * each binding will create its own `fuchsia.input.report.InputReportsReader`, and
800        // * the device driver will copy each incoming report to each connected reader.
801        //
802        // This does mean that reports from the Atlas touchpad device get read twice
803        // (by a `MouseBinding` and a `TouchBinding`), regardless of whether the device
804        // is operating in mouse mode or touchpad mode.
805        //
806        // This hasn't been an issue because:
807        // * Semantically: things are fine, because each binding discards irrelevant reports.
808        //   (E.g. `MouseBinding` discards anything that isn't a `MouseInputReport`), and
809        // * Performance wise: things are fine, because the data rate of the touchpad is low
810        //   (125 HZ).
811        //
812        // If we add additional cases where bindings share an underlying service instance,
813        // we might consider adding a multiplexing binding, to avoid reading duplicate reports.
814        let proxy = device_proxy.clone();
815        let device_node =
816            input_devices_node.create_child(format!("{}_{}", instance_name, device_type));
817        match input_device::get_device_binding(
818            *device_type,
819            proxy,
820            device_id,
821            input_event_sender.clone(),
822            device_node,
823            feature_flags.clone(),
824            metrics_logger.clone(),
825        )
826        .await
827        {
828            Ok(binding) => new_bindings.push(binding),
829            Err(e) => {
830                metrics_logger.log_error(
831                    InputPipelineErrorMetricDimensionEvent::InputPipelineFailedToBind,
832                    std::format!("failed to bind {} as {:?}: {}", instance_name, device_type, e),
833                );
834            }
835        }
836    }
837
838    if !new_bindings.is_empty() {
839        let mut bindings = bindings.lock();
840        if let Some(v) = bindings.get_mut(&device_id) {
841            v.extend(new_bindings);
842        } else {
843            bindings.insert(device_id, new_bindings);
844        }
845    }
846}
847
848#[cfg(test)]
849mod tests {
850    use super::*;
851    use crate::input_device::{InputDeviceBinding, InputEventType};
852    use crate::utils::Position;
853    use crate::{fake_input_device_binding, mouse_binding, observe_fake_events_input_handler};
854    use async_trait::async_trait;
855    use diagnostics_assertions::AnyProperty;
856    use fidl::endpoints::{create_proxy_and_stream, create_request_stream};
857    use fuchsia_async as fasync;
858    use futures::FutureExt;
859    use pretty_assertions::assert_eq;
860    use rand::Rng;
861    use sorted_vec_map::SortedVecSet;
862    use vfs::{pseudo_directory, service as pseudo_fs_service};
863
864    /// Returns the InputEvent sent over `sender`.
865    ///
866    /// # Parameters
867    /// - `sender`: The channel to send the InputEvent over.
868    fn send_input_event(
869        sender: UnboundedSender<Vec<input_device::InputEvent>>,
870    ) -> Vec<input_device::InputEvent> {
871        let mut rng = rand::rng();
872        let offset =
873            Position { x: rng.random_range(0..10) as f32, y: rng.random_range(0..10) as f32 };
874        let input_event = input_device::InputEvent {
875            device_event: input_device::InputDeviceEvent::Mouse(mouse_binding::MouseEvent::new(
876                mouse_binding::MouseLocation::Relative(mouse_binding::RelativeLocation {
877                    counts: Position { x: offset.x, y: offset.y },
878                }),
879                None, /* wheel_delta_v */
880                None, /* wheel_delta_h */
881                mouse_binding::MousePhase::Move,
882                SortedVecSet::new(),
883                SortedVecSet::new(),
884                None, /* is_precision_scroll */
885                None, /* wake_lease */
886            )),
887            device_descriptor: input_device::InputDeviceDescriptor::Mouse(
888                mouse_binding::MouseDeviceDescriptor {
889                    device_id: 1,
890                    absolute_x_range: None,
891                    absolute_y_range: None,
892                    wheel_v_range: None,
893                    wheel_h_range: None,
894                    buttons: None,
895                },
896            ),
897            event_time: zx::MonotonicInstant::get(),
898            handled: input_device::Handled::No,
899            trace_id: None,
900        };
901        match sender.unbounded_send(vec![input_event.clone()]) {
902            Err(_) => assert!(false),
903            _ => {}
904        }
905
906        vec![input_event]
907    }
908
909    /// Returns a MouseDescriptor on an InputDeviceRequest.
910    ///
911    /// # Parameters
912    /// - `input_device_request`: The request to handle.
913    fn handle_input_device_request(
914        input_device_request: fidl_fuchsia_input_report::InputDeviceRequest,
915    ) {
916        match input_device_request {
917            fidl_fuchsia_input_report::InputDeviceRequest::GetDescriptor { responder } => {
918                let _ = responder.send(&fidl_fuchsia_input_report::DeviceDescriptor {
919                    device_information: None,
920                    mouse: Some(fidl_fuchsia_input_report::MouseDescriptor {
921                        input: Some(fidl_fuchsia_input_report::MouseInputDescriptor {
922                            movement_x: None,
923                            movement_y: None,
924                            scroll_v: None,
925                            scroll_h: None,
926                            buttons: Some(vec![0]),
927                            position_x: None,
928                            position_y: None,
929                            ..Default::default()
930                        }),
931                        ..Default::default()
932                    }),
933                    sensor: None,
934                    touch: None,
935                    keyboard: None,
936                    consumer_control: None,
937                    ..Default::default()
938                });
939            }
940            _ => {}
941        }
942    }
943
944    /// Tests that an input pipeline handles events from multiple devices.
945    #[fasync::run_singlethreaded(test)]
946    async fn multiple_devices_single_handler() {
947        // Create two fake device bindings.
948        let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
949        let first_device_binding =
950            fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
951        let second_device_binding =
952            fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
953
954        // Create a fake input handler.
955        let (handler_event_sender, mut handler_event_receiver) =
956            futures::channel::mpsc::channel(100);
957        let input_handler = observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
958            handler_event_sender,
959        );
960
961        // Build the input pipeline.
962        let (sender, receiver, handlers, _, _, _) =
963            InputPipelineAssembly::new(metrics::MetricsLogger::default())
964                .add_handler(input_handler)
965                .into_components();
966        let inspector = fuchsia_inspect::Inspector::default();
967        let test_node = inspector.root().create_child("input_pipeline");
968        let input_pipeline = InputPipeline {
969            pipeline_sender: sender,
970            device_event_sender,
971            device_event_receiver,
972            input_device_types: vec![],
973            input_device_bindings: Arc::new(Mutex::new(SortedVecMap::new())),
974            inspect_node: test_node,
975            metrics_logger: metrics::MetricsLogger::default(),
976            feature_flags: input_device::InputPipelineFeatureFlags::default(),
977            _tasks: vec![],
978            _fasync_tasks: vec![],
979        };
980        let _runner_task =
981            InputPipeline::run(receiver, handlers, metrics::MetricsLogger::default());
982
983        // Send an input event from each device.
984        let first_device_events = send_input_event(first_device_binding.input_event_sender());
985        let second_device_events = send_input_event(second_device_binding.input_event_sender());
986
987        // Run the pipeline.
988        let _pipeline_task = fasync::Task::local(async {
989            input_pipeline.handle_input_events().await;
990        });
991
992        // Assert the handler receives the events.
993        let first_handled_event = handler_event_receiver.next().await;
994        assert_eq!(first_handled_event, first_device_events.into_iter().next());
995
996        let second_handled_event = handler_event_receiver.next().await;
997        assert_eq!(second_handled_event, second_device_events.into_iter().next());
998    }
999
1000    /// Tests that an input pipeline handles events through multiple input handlers.
1001    #[fasync::run_singlethreaded(test)]
1002    async fn single_device_multiple_handlers() {
1003        // Create two fake device bindings.
1004        let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
1005        let input_device_binding =
1006            fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
1007
1008        // Create two fake input handlers.
1009        let (first_handler_event_sender, mut first_handler_event_receiver) =
1010            futures::channel::mpsc::channel(100);
1011        let first_input_handler =
1012            observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
1013                first_handler_event_sender,
1014            );
1015        let (second_handler_event_sender, mut second_handler_event_receiver) =
1016            futures::channel::mpsc::channel(100);
1017        let second_input_handler =
1018            observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
1019                second_handler_event_sender,
1020            );
1021
1022        // Build the input pipeline.
1023        let (sender, receiver, handlers, _, _, _) =
1024            InputPipelineAssembly::new(metrics::MetricsLogger::default())
1025                .add_handler(first_input_handler)
1026                .add_handler(second_input_handler)
1027                .into_components();
1028        let inspector = fuchsia_inspect::Inspector::default();
1029        let test_node = inspector.root().create_child("input_pipeline");
1030        let input_pipeline = InputPipeline {
1031            pipeline_sender: sender,
1032            device_event_sender,
1033            device_event_receiver,
1034            input_device_types: vec![],
1035            input_device_bindings: Arc::new(Mutex::new(SortedVecMap::new())),
1036            inspect_node: test_node,
1037            metrics_logger: metrics::MetricsLogger::default(),
1038            feature_flags: input_device::InputPipelineFeatureFlags::default(),
1039            _tasks: vec![],
1040            _fasync_tasks: vec![],
1041        };
1042        let _runner_task =
1043            InputPipeline::run(receiver, handlers, metrics::MetricsLogger::default());
1044
1045        // Send an input event.
1046        let input_events = send_input_event(input_device_binding.input_event_sender());
1047
1048        // Run the pipeline.
1049        let _pipeline_task = fasync::Task::local(async {
1050            input_pipeline.handle_input_events().await;
1051        });
1052
1053        // Assert both handlers receive the event.
1054        let expected_event = input_events.into_iter().next();
1055        let first_handler_event = first_handler_event_receiver.next().await;
1056        assert_eq!(first_handler_event, expected_event);
1057        let second_handler_event = second_handler_event_receiver.next().await;
1058        assert_eq!(second_handler_event, expected_event);
1059    }
1060
1061    /// Tests that a single mouse device binding is created for the one input device in the
1062    /// input report service directory.
1063    #[fasync::run_singlethreaded(test)]
1064    async fn watch_devices_one_match_exists() {
1065        // Create a pseudo directory representing a service instance for an input device.
1066        let mut count: i8 = 0;
1067        let dir = pseudo_directory! {
1068            "instance_0" => pseudo_directory! {
1069                "input_device" => pseudo_fs_service::host(
1070                    move |mut request_stream: fidl_fuchsia_input_report::InputDeviceRequestStream| {
1071                        async move {
1072                            while count < 3 {
1073                                if let Some(input_device_request) =
1074                                    request_stream.try_next().await.unwrap()
1075                                {
1076                                    handle_input_device_request(input_device_request);
1077                                    count += 1;
1078                                }
1079                            }
1080
1081                        }.boxed()
1082                    },
1083                )
1084            }
1085        };
1086
1087        // Create a Watcher on the pseudo directory.
1088        let dir_proxy_for_watcher = vfs::directory::serve_read_only(
1089            dir.clone(),
1090            vfs::execution_scope::ExecutionScope::new(),
1091        );
1092        let device_watcher = Watcher::new(&dir_proxy_for_watcher).await.unwrap();
1093        // Get a proxy to the pseudo directory for the input pipeline. The input pipeline uses this
1094        // proxy to get connections to input devices.
1095        let dir_proxy_for_pipeline =
1096            vfs::directory::serve_read_only(dir, vfs::execution_scope::ExecutionScope::new());
1097
1098        let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
1099        let bindings: InputDeviceBindingMap = Arc::new(Mutex::new(SortedVecMap::new()));
1100        let supported_device_types = vec![input_device::InputDeviceType::Mouse];
1101
1102        let inspector = fuchsia_inspect::Inspector::default();
1103        let test_node = inspector.root().create_child("input_pipeline");
1104        test_node.record_string(
1105            "supported_input_devices",
1106            supported_device_types.clone().iter().join(", "),
1107        );
1108        let input_devices = test_node.create_child("input_devices");
1109        // Assert that inspect tree is initialized with no devices.
1110        diagnostics_assertions::assert_data_tree!(inspector, root: {
1111            input_pipeline: {
1112                supported_input_devices: "Mouse",
1113                input_devices: {}
1114            }
1115        });
1116
1117        let _ = InputPipeline::watch_for_devices(
1118            device_watcher,
1119            dir_proxy_for_pipeline,
1120            &supported_device_types,
1121            input_event_sender,
1122            bindings.clone(),
1123            &input_devices,
1124            true, /* break_on_idle */
1125            InputPipelineFeatureFlags { enable_merge_touch_events: false },
1126            metrics::MetricsLogger::default(),
1127        )
1128        .await;
1129
1130        // Assert that one mouse device with accurate device id was found.
1131        let bindings_map = bindings.lock();
1132        assert_eq!(bindings_map.len(), 1);
1133        let bindings_vector = bindings_map.get(&10);
1134        assert!(bindings_vector.is_some());
1135        assert_eq!(bindings_vector.unwrap().len(), 1);
1136        let boxed_mouse_binding = bindings_vector.unwrap().get(0);
1137        assert!(boxed_mouse_binding.is_some());
1138        assert_eq!(
1139            boxed_mouse_binding.unwrap().get_device_descriptor(),
1140            input_device::InputDeviceDescriptor::Mouse(mouse_binding::MouseDeviceDescriptor {
1141                device_id: 10,
1142                absolute_x_range: None,
1143                absolute_y_range: None,
1144                wheel_v_range: None,
1145                wheel_h_range: None,
1146                buttons: Some(vec![0]),
1147            })
1148        );
1149
1150        // Assert that inspect tree reflects new device discovered and connected.
1151        diagnostics_assertions::assert_data_tree!(inspector, root: {
1152            input_pipeline: {
1153                supported_input_devices: "Mouse",
1154                input_devices: {
1155                    devices_discovered: 1u64,
1156                    devices_connected: 1u64,
1157                    "instance_0_Mouse": contains {
1158                        reports_received_count: 0u64,
1159                        reports_filtered_count: 0u64,
1160                        events_generated: 0u64,
1161                        last_received_timestamp_ns: 0u64,
1162                        last_generated_timestamp_ns: 0u64,
1163                        "fuchsia.inspect.Health": {
1164                            status: "OK",
1165                            // Timestamp value is unpredictable and not relevant in this context,
1166                            // so we only assert that the property is present.
1167                            start_timestamp_nanos: AnyProperty
1168                        },
1169                    }
1170                }
1171            }
1172        });
1173    }
1174
1175    /// Tests that no device bindings are created because the input pipeline looks for keyboard devices
1176    /// but only a mouse exists.
1177    #[fasync::run_singlethreaded(test)]
1178    async fn watch_devices_no_matches_exist() {
1179        // Create a pseudo directory representing a service instance for an input device.
1180        let mut count: i8 = 0;
1181        let dir = pseudo_directory! {
1182            "instance_0" => pseudo_directory! {
1183                "input_device" => pseudo_fs_service::host(
1184                    move |mut request_stream: fidl_fuchsia_input_report::InputDeviceRequestStream| {
1185                        async move {
1186                            while count < 1 {
1187                                if let Some(input_device_request) =
1188                                    request_stream.try_next().await.unwrap()
1189                                {
1190                                    handle_input_device_request(input_device_request);
1191                                    count += 1;
1192                                }
1193                            }
1194
1195                        }.boxed()
1196                    },
1197                )
1198            }
1199        };
1200
1201        // Create a Watcher on the pseudo directory.
1202        let dir_proxy_for_watcher = vfs::directory::serve_read_only(
1203            dir.clone(),
1204            vfs::execution_scope::ExecutionScope::new(),
1205        );
1206        let device_watcher = Watcher::new(&dir_proxy_for_watcher).await.unwrap();
1207        // Get a proxy to the pseudo directory for the input pipeline. The input pipeline uses this
1208        // proxy to get connections to input devices.
1209        let dir_proxy_for_pipeline =
1210            vfs::directory::serve_read_only(dir, vfs::execution_scope::ExecutionScope::new());
1211
1212        let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
1213        let bindings: InputDeviceBindingMap = Arc::new(Mutex::new(SortedVecMap::new()));
1214        let supported_device_types = vec![input_device::InputDeviceType::Keyboard];
1215
1216        let inspector = fuchsia_inspect::Inspector::default();
1217        let test_node = inspector.root().create_child("input_pipeline");
1218        test_node.record_string(
1219            "supported_input_devices",
1220            supported_device_types.clone().iter().join(", "),
1221        );
1222        let input_devices = test_node.create_child("input_devices");
1223        // Assert that inspect tree is initialized with no devices.
1224        diagnostics_assertions::assert_data_tree!(inspector, root: {
1225            input_pipeline: {
1226                supported_input_devices: "Keyboard",
1227                input_devices: {}
1228            }
1229        });
1230
1231        let _ = InputPipeline::watch_for_devices(
1232            device_watcher,
1233            dir_proxy_for_pipeline,
1234            &supported_device_types,
1235            input_event_sender,
1236            bindings.clone(),
1237            &input_devices,
1238            true, /* break_on_idle */
1239            InputPipelineFeatureFlags { enable_merge_touch_events: false },
1240            metrics::MetricsLogger::default(),
1241        )
1242        .await;
1243
1244        // Assert that no devices were found.
1245        let bindings = bindings.lock();
1246        assert_eq!(bindings.len(), 0);
1247
1248        // Assert that inspect tree reflects new device discovered, but not connected.
1249        diagnostics_assertions::assert_data_tree!(inspector, root: {
1250            input_pipeline: {
1251                supported_input_devices: "Keyboard",
1252                input_devices: {
1253                    devices_discovered: 1u64,
1254                    devices_connected: 0u64,
1255                    "instance_0_Unsupported": {
1256                        "fuchsia.inspect.Health": {
1257                            status: "UNHEALTHY",
1258                            message: "Unsupported device type.",
1259                            // Timestamp value is unpredictable and not relevant in this context,
1260                            // so we only assert that the property is present.
1261                            start_timestamp_nanos: AnyProperty
1262                        },
1263                    }
1264                }
1265            }
1266        });
1267    }
1268
1269    /// Tests that a single keyboard device binding is created for the input device registered
1270    /// through InputDeviceRegistry.
1271    #[fasync::run_singlethreaded(test)]
1272    async fn handle_input_device_registry_request_stream() {
1273        let (input_device_registry_proxy, input_device_registry_request_stream) =
1274            create_proxy_and_stream::<fidl_fuchsia_input_injection::InputDeviceRegistryMarker>();
1275        let (input_device_client_end, mut input_device_request_stream) =
1276            create_request_stream::<fidl_fuchsia_input_report::InputDeviceMarker>();
1277
1278        let device_types = vec![input_device::InputDeviceType::Mouse];
1279        let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
1280        let bindings: InputDeviceBindingMap = Arc::new(Mutex::new(SortedVecMap::new()));
1281
1282        // Handle input device requests.
1283        let mut count: i8 = 0;
1284        let _task = fasync::Task::local(async move {
1285            // Register a device.
1286            let _ = input_device_registry_proxy.register(input_device_client_end);
1287
1288            while count < 3 {
1289                if let Some(input_device_request) =
1290                    input_device_request_stream.try_next().await.unwrap()
1291                {
1292                    handle_input_device_request(input_device_request);
1293                    count += 1;
1294                }
1295            }
1296
1297            // End handle_input_device_registry_request_stream() by taking the event stream.
1298            input_device_registry_proxy.take_event_stream();
1299        });
1300
1301        let inspector = fuchsia_inspect::Inspector::default();
1302        let test_node = inspector.root().create_child("input_pipeline");
1303
1304        // Start listening for InputDeviceRegistryRequests.
1305        let bindings_clone = bindings.clone();
1306        let _ = InputPipeline::handle_input_device_registry_request_stream(
1307            input_device_registry_request_stream,
1308            &device_types,
1309            &input_event_sender,
1310            &bindings_clone,
1311            &test_node,
1312            InputPipelineFeatureFlags { enable_merge_touch_events: false },
1313            metrics::MetricsLogger::default(),
1314        )
1315        .await;
1316
1317        // Assert that a device was registered.
1318        let bindings = bindings.lock();
1319        assert_eq!(bindings.len(), 1);
1320    }
1321
1322    // Tests that correct properties are added to inspect node when InputPipeline is created.
1323    #[fasync::run_singlethreaded(test)]
1324    async fn check_inspect_node_has_correct_properties() {
1325        let device_types = vec![
1326            input_device::InputDeviceType::Touch,
1327            input_device::InputDeviceType::ConsumerControls,
1328        ];
1329        let inspector = fuchsia_inspect::Inspector::default();
1330        let test_node = inspector.root().create_child("input_pipeline");
1331        // Create fake input handler for assembly
1332        let (fake_handler_event_sender, _fake_handler_event_receiver) =
1333            futures::channel::mpsc::channel(100);
1334        let fake_input_handler =
1335            observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
1336                fake_handler_event_sender,
1337            );
1338        let assembly = InputPipelineAssembly::new(metrics::MetricsLogger::default())
1339            .add_handler(fake_input_handler);
1340        let _test_input_pipeline = InputPipeline::new(
1341            &Incoming::new(),
1342            device_types,
1343            assembly,
1344            test_node,
1345            InputPipelineFeatureFlags { enable_merge_touch_events: false },
1346            metrics::MetricsLogger::default(),
1347        );
1348        diagnostics_assertions::assert_data_tree!(inspector, root: {
1349            input_pipeline: {
1350                supported_input_devices: "Touch, ConsumerControls",
1351                handlers_registered: 1u64,
1352                handlers_healthy: 1u64,
1353                input_devices: {}
1354            }
1355        });
1356    }
1357
1358    struct SpecificInterestFakeHandler {
1359        interest_types: Vec<input_device::InputEventType>,
1360        event_sender: std::cell::RefCell<futures::channel::mpsc::Sender<input_device::InputEvent>>,
1361    }
1362
1363    impl SpecificInterestFakeHandler {
1364        pub fn new(
1365            interest_types: Vec<input_device::InputEventType>,
1366            event_sender: futures::channel::mpsc::Sender<input_device::InputEvent>,
1367        ) -> Rc<Self> {
1368            Rc::new(SpecificInterestFakeHandler {
1369                interest_types,
1370                event_sender: std::cell::RefCell::new(event_sender),
1371            })
1372        }
1373    }
1374
1375    impl Handler for SpecificInterestFakeHandler {
1376        fn set_handler_healthy(self: std::rc::Rc<Self>) {}
1377        fn set_handler_unhealthy(self: std::rc::Rc<Self>, _msg: &str) {}
1378        fn get_name(&self) -> &'static str {
1379            "SpecificInterestFakeHandler"
1380        }
1381
1382        fn interest(&self) -> Vec<input_device::InputEventType> {
1383            self.interest_types.clone()
1384        }
1385    }
1386
1387    #[async_trait(?Send)]
1388    impl input_handler::InputHandler for SpecificInterestFakeHandler {
1389        async fn handle_input_event(
1390            self: Rc<Self>,
1391            input_event: input_device::InputEvent,
1392        ) -> Vec<input_device::InputEvent> {
1393            match self.event_sender.borrow_mut().try_send(input_event.clone()) {
1394                Err(e) => panic!("SpecificInterestFakeHandler failed to send event: {:?}", e),
1395                Ok(_) => {}
1396            }
1397            vec![input_event]
1398        }
1399    }
1400
1401    #[fasync::run_singlethreaded(test)]
1402    async fn run_only_sends_events_to_interested_handlers() {
1403        // Mouse Handler (Specific Interest: Mouse)
1404        let (mouse_sender, mut mouse_receiver) = futures::channel::mpsc::channel(1);
1405        let mouse_handler =
1406            SpecificInterestFakeHandler::new(vec![InputEventType::Mouse], mouse_sender);
1407
1408        // Fake Handler (Specific Interest: Fake)
1409        let (fake_sender, mut fake_receiver) = futures::channel::mpsc::channel(1);
1410        let fake_handler =
1411            SpecificInterestFakeHandler::new(vec![InputEventType::Fake], fake_sender);
1412
1413        let (pipeline_sender, pipeline_receiver, handlers, _, _, _) =
1414            InputPipelineAssembly::new(metrics::MetricsLogger::default())
1415                .add_handler(mouse_handler)
1416                .add_handler(fake_handler)
1417                .into_components();
1418
1419        // Run the pipeline logic
1420        let _runner_task =
1421            InputPipeline::run(pipeline_receiver, handlers, metrics::MetricsLogger::default());
1422
1423        // Create a Fake event
1424        let fake_event = input_device::InputEvent {
1425            device_event: input_device::InputDeviceEvent::Fake,
1426            device_descriptor: input_device::InputDeviceDescriptor::Fake,
1427            event_time: zx::MonotonicInstant::get(),
1428            handled: input_device::Handled::No,
1429            trace_id: None,
1430        };
1431
1432        // Send the Fake event
1433        pipeline_sender.unbounded_send(vec![fake_event.clone()]).expect("failed to send event");
1434
1435        // Verify Fake Handler received it
1436        let received_by_fake = fake_receiver.next().await;
1437        assert_eq!(received_by_fake, Some(fake_event));
1438
1439        // Verify Mouse Handler did NOT receive it
1440        assert!(mouse_receiver.try_next().is_err());
1441    }
1442
1443    fn create_mouse_event(x: f32, y: f32) -> input_device::InputEvent {
1444        input_device::InputEvent {
1445            device_event: input_device::InputDeviceEvent::Mouse(mouse_binding::MouseEvent::new(
1446                mouse_binding::MouseLocation::Relative(mouse_binding::RelativeLocation {
1447                    counts: Position { x, y },
1448                }),
1449                None,
1450                None,
1451                mouse_binding::MousePhase::Move,
1452                SortedVecSet::new(),
1453                SortedVecSet::new(),
1454                None,
1455                None,
1456            )),
1457            device_descriptor: input_device::InputDeviceDescriptor::Mouse(
1458                mouse_binding::MouseDeviceDescriptor {
1459                    device_id: 1,
1460                    absolute_x_range: None,
1461                    absolute_y_range: None,
1462                    wheel_v_range: None,
1463                    wheel_h_range: None,
1464                    buttons: None,
1465                },
1466            ),
1467            event_time: zx::MonotonicInstant::get(),
1468            handled: input_device::Handled::No,
1469            trace_id: None,
1470        }
1471    }
1472
1473    #[fasync::run_singlethreaded(test)]
1474    async fn run_mixed_event_types_dispatched_correctly() {
1475        // Mouse Handler (Specific Interest: Mouse)
1476        let (mouse_sender, mut mouse_receiver) = futures::channel::mpsc::channel(10);
1477        let mouse_handler =
1478            SpecificInterestFakeHandler::new(vec![InputEventType::Mouse], mouse_sender);
1479
1480        // Fake Handler (Specific Interest: Fake)
1481        let (fake_sender, mut fake_receiver) = futures::channel::mpsc::channel(10);
1482        let fake_handler =
1483            SpecificInterestFakeHandler::new(vec![InputEventType::Fake], fake_sender);
1484
1485        let (pipeline_sender, pipeline_receiver, handlers, _, _, _) =
1486            InputPipelineAssembly::new(metrics::MetricsLogger::default())
1487                .add_handler(mouse_handler)
1488                .add_handler(fake_handler)
1489                .into_components();
1490
1491        // Run the pipeline logic
1492        let _runner_task =
1493            InputPipeline::run(pipeline_receiver, handlers, metrics::MetricsLogger::default());
1494
1495        // Create events
1496        let mouse_event_1 = create_mouse_event(1.0, 1.0);
1497        let mouse_event_2 = create_mouse_event(2.0, 2.0);
1498        let mouse_event_3 = create_mouse_event(3.0, 3.0);
1499
1500        let fake_event_1 = input_device::InputEvent {
1501            device_event: input_device::InputDeviceEvent::Fake,
1502            device_descriptor: input_device::InputDeviceDescriptor::Fake,
1503            event_time: zx::MonotonicInstant::get(),
1504            handled: input_device::Handled::No,
1505            trace_id: None,
1506        };
1507
1508        // Send mixed batch: [Mouse, Mouse, Fake, Mouse]
1509        // This should result in 3 chunks: [Mouse, Mouse], [Fake], [Mouse]
1510        let mixed_batch = vec![
1511            mouse_event_1.clone(),
1512            mouse_event_2.clone(),
1513            fake_event_1.clone(),
1514            mouse_event_3.clone(),
1515        ];
1516        pipeline_sender.unbounded_send(mixed_batch).expect("failed to send events");
1517
1518        // Verify Mouse Handler received M1, M2, and then M3
1519        assert_eq!(mouse_receiver.next().await, Some(mouse_event_1));
1520        assert_eq!(mouse_receiver.next().await, Some(mouse_event_2));
1521        assert_eq!(mouse_receiver.next().await, Some(mouse_event_3));
1522
1523        // Verify Fake Handler received F1
1524        assert_eq!(fake_receiver.next().await, Some(fake_event_1));
1525    }
1526}
input_pipeline_dso/input_pipeline.rs

input_pipeline_dso/
input_pipeline.rs
