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// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use {
crate::{
autorepeater::Autorepeater, display_ownership::DisplayOwnership,
focus_listener::FocusListener, input_device, input_handler, metrics,
},
anyhow::{format_err, Context, Error},
fidl_fuchsia_io as fio,
focus_chain_provider::FocusChainProviderPublisher,
fuchsia_async as fasync,
fuchsia_fs::directory::{WatchEvent, Watcher},
fuchsia_inspect::health::Reporter,
fuchsia_inspect::NumericProperty,
fuchsia_zircon as zx,
futures::channel::mpsc::{self, UnboundedReceiver, UnboundedSender},
futures::lock::Mutex,
futures::{StreamExt, TryStreamExt},
itertools::Itertools,
metrics_registry::*,
std::collections::HashMap,
std::path::PathBuf,
std::rc::Rc,
std::sync::Arc,
};
type BoxedInputDeviceBinding = Box<dyn input_device::InputDeviceBinding>;
/// An [`InputDeviceBindingHashMap`] maps an input device to one or more InputDeviceBindings.
/// It expects filenames of the input devices seen in /dev/class/input-report (ex. "001") or
/// "injected_device" as keys.
pub type InputDeviceBindingHashMap = Arc<Mutex<HashMap<u32, Vec<BoxedInputDeviceBinding>>>>;
/// An input pipeline assembly.
///
/// Represents a partial stage of the input pipeline which accepts inputs through an asynchronous
/// sender channel, and emits outputs through an asynchronous receiver channel. Use [new] to
/// create a new assembly. Use [add_handler], or [add_all_handlers] to add the input pipeline
/// handlers to use. When done, [InputPipeline::new] can be used to make a new input pipeline.
///
/// # Implementation notes
///
/// Internally, when a new [InputPipelineAssembly] is created with multiple [InputHandler]s, the
/// handlers are connected together using async queues. This allows fully streamed processing of
/// input events, and also allows some pipeline stages to generate events spontaneously, i.e.
/// without an external stimulus.
pub struct InputPipelineAssembly {
/// The top-level sender: send into this queue to inject an event into the input
/// pipeline.
sender: UnboundedSender<input_device::InputEvent>,
/// The bottom-level receiver: any events that fall through the entire pipeline can
/// be read from this receiver. See [catch_unhandled] for a canned way to catch and
/// log unhandled events.
receiver: UnboundedReceiver<input_device::InputEvent>,
/// The tasks that were instantiated as result of calling [new]. You *must*
/// submit all the tasks to an executor to have them start. Use [components] to
/// get the tasks. See [run] for a canned way to start these tasks.
tasks: Vec<fuchsia_async::Task<()>>,
/// The metrics logger.
metrics_logger: metrics::MetricsLogger,
}
impl InputPipelineAssembly {
/// Create a new but empty [InputPipelineAssembly]. Use [add_handler] or similar
/// to add new handlers to it.
pub fn new(metrics_logger: metrics::MetricsLogger) -> Self {
let (sender, receiver) = mpsc::unbounded();
let tasks = vec![];
InputPipelineAssembly { sender, receiver, tasks, metrics_logger }
}
/// Adds another [input_handler::InputHandler] into the [InputPipelineAssembly]. The handlers
/// are invoked in the order they are added, and successive handlers are glued together using
/// unbounded queues. Returns `Self` for chaining.
pub fn add_handler(self, handler: Rc<dyn input_handler::InputHandler>) -> Self {
let (sender, mut receiver, mut tasks, metrics_logger) = self.into_components();
let metrics_logger_clone = metrics_logger.clone();
let (next_sender, next_receiver) = mpsc::unbounded();
let handler_name = handler.get_name();
tasks.push(fasync::Task::local(async move {
handler.clone().set_handler_healthy();
while let Some(event) = receiver.next().await {
// Note: the `handler_name` _should not_ be used as ABI (e.g. referenced from
// data processing scripts), as `handler_name` is not guaranteed to be consistent
// between releases.
let out_events = {
let _async_trace = fuchsia_trace::async_enter!(
fuchsia_trace::Id::new(),
c"input",
c"handle_input_event",
"name" => handler_name
);
handler.clone().handle_input_event(event).await
};
for out_event in out_events.into_iter() {
if let Err(e) = next_sender.unbounded_send(out_event) {
metrics_logger_clone.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineCouldNotForwardEvent,
std::format!(
"could not forward event output from handler: {:?}: {:?}",
handler_name,
e));
// This is not a recoverable error, break here.
break;
}
}
}
handler.clone().set_handler_unhealthy(std::format!("Receive loop terminated for handler: {:?}", handler_name).as_str());
panic!("receive loop is not supposed to terminate for handler: {:?}", handler_name);
}));
receiver = next_receiver;
InputPipelineAssembly { sender, receiver, tasks, metrics_logger }
}
/// Adds all handlers into the assembly in the order they appear in `handlers`.
pub fn add_all_handlers(self, handlers: Vec<Rc<dyn input_handler::InputHandler>>) -> Self {
handlers.into_iter().fold(self, |assembly, handler| assembly.add_handler(handler))
}
/// Adds the [DisplayOwnership] to the input pipeline. The `display_ownership_event` is
/// assumed to be the Scenic event used to report changes in display ownership, obtained
/// by `fuchsia.ui.scenic/Scenic.GetDisplayOwnershipEvent`. This code has no way to check
/// whether that invariant is upheld, so this is something that the user will need to
/// ensure.
pub fn add_display_ownership(
self,
display_ownership_event: zx::Event,
input_handlers_node: &fuchsia_inspect::Node,
) -> InputPipelineAssembly {
let (sender, autorepeat_receiver, mut tasks, metrics_logger) = self.into_components();
let (autorepeat_sender, receiver) = mpsc::unbounded();
let h = DisplayOwnership::new(display_ownership_event, input_handlers_node);
let metrics_logger_clone = metrics_logger.clone();
tasks.push(fasync::Task::local(async move {
h.clone().set_handler_healthy();
h.clone().handle_input_events(autorepeat_receiver, autorepeat_sender)
.await
.map_err(|e| {
metrics_logger_clone.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineDisplayOwnershipIsNotSupposedToTerminate,
std::format!(
"display ownership is not supposed to terminate - this is likely a problem: {:?}", e));
}).unwrap();
h.set_handler_unhealthy("Receive loop terminated for handler: DisplayOwnership");
}));
InputPipelineAssembly { sender, receiver, tasks, metrics_logger }
}
/// Adds the autorepeater into the input pipeline assembly. The autorepeater
/// is installed after any handlers that have been already added to the
/// assembly.
pub fn add_autorepeater(self, input_handlers_node: &fuchsia_inspect::Node) -> Self {
let (sender, autorepeat_receiver, mut tasks, metrics_logger) = self.into_components();
let (autorepeat_sender, receiver) = mpsc::unbounded();
let metrics_logger_clone = metrics_logger.clone();
let a = Autorepeater::new(autorepeat_receiver, input_handlers_node, metrics_logger.clone());
tasks.push(fasync::Task::local(async move {
a.clone().set_handler_healthy();
a.clone()
.run(autorepeat_sender)
.await
.map_err(|e| {
metrics_logger_clone.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineAutorepeatRunningError,
std::format!("error while running autorepeater: {:?}", e),
);
})
.expect("autorepeater should never error out");
a.set_handler_unhealthy("Receive loop terminated for handler: Autorepeater");
}));
InputPipelineAssembly { sender, receiver, tasks, metrics_logger }
}
/// Deconstructs the assembly into constituent components, used when constructing
/// [InputPipeline].
///
/// You should call [catch_unhandled] on the returned [async_channel::Receiver], and
/// [run] on the returned [fuchsia_async::Tasks] (or supply own equivalents).
fn into_components(
self,
) -> (
UnboundedSender<input_device::InputEvent>,
UnboundedReceiver<input_device::InputEvent>,
Vec<fuchsia_async::Task<()>>,
metrics::MetricsLogger,
) {
(self.sender, self.receiver, self.tasks, self.metrics_logger)
}
/// Adds a focus listener task into the input pipeline assembly. The focus
/// listener forwards focus chain changes to
/// `fuchsia.ui.keyboard.focus.Controller` and watchers of
/// `fuchsia.ui.focus.FocusChainProvider`. It is required for the correct
/// operation of the implementors of those protocols, e.g. `text_manager`.
///
/// # Arguments:
/// * `focus_chain_publisher`: to forward to other downstream watchers.
///
/// # Requires:
/// * `fuchsia.ui.views.FocusChainListenerRegistry`: to register for updates.
/// * `fuchsia.ui.keyboard.focus.Controller`: to forward to text_manager.
pub fn add_focus_listener(self, focus_chain_publisher: FocusChainProviderPublisher) -> Self {
let (sender, receiver, mut tasks, metrics_logger) = self.into_components();
let metrics_logger_clone = metrics_logger.clone();
tasks.push(fasync::Task::local(async move {
if let Ok(mut focus_listener) =
FocusListener::new(focus_chain_publisher, metrics_logger_clone).map_err(|e| {
tracing::warn!(
"could not create focus listener, focus will not be dispatched: {:?}",
e
)
})
{
// This will await indefinitely and process focus messages in a loop, unless there
// is a problem.
let _result = focus_listener
.dispatch_focus_changes()
.await
.map(|_| {
tracing::warn!(
"dispatch focus loop ended, focus will no longer be dispatched"
)
})
.map_err(|e| {
panic!("could not dispatch focus changes, this is a fatal error: {:?}", e)
});
}
}));
InputPipelineAssembly { sender, receiver, tasks, metrics_logger }
}
}
/// An [`InputPipeline`] manages input devices and propagates input events through input handlers.
///
/// On creation, clients declare what types of input devices an [`InputPipeline`] manages. The
/// [`InputPipeline`] will continuously detect new input devices of supported type(s).
///
/// # Example
/// ```
/// let ime_handler =
/// ImeHandler::new(scene_manager.session.clone(), scene_manager.compositor_id).await?;
/// let touch_handler = TouchHandler::new(
/// scene_manager.session.clone(),
/// scene_manager.compositor_id,
/// scene_manager.display_size
/// ).await?;
///
/// let assembly = InputPipelineAssembly::new()
/// .add_handler(Box::new(ime_handler)),
/// .add_handler(Box::new(touch_handler)),
/// let input_pipeline = InputPipeline::new(
/// vec![
/// input_device::InputDeviceType::Touch,
/// input_device::InputDeviceType::Keyboard,
/// ],
/// assembly,
/// );
/// input_pipeline.handle_input_events().await;
/// ```
pub struct InputPipeline {
/// The entry point into the input handler pipeline. Incoming input events should
/// be inserted into this async queue, and the input pipeline will ensure that they
/// are propagated through all the input handlers in the appropriate sequence.
pipeline_sender: UnboundedSender<input_device::InputEvent>,
/// A clone of this sender is given to every InputDeviceBinding that this pipeline owns.
/// Each InputDeviceBinding will send InputEvents to the pipeline through this channel.
device_event_sender: UnboundedSender<input_device::InputEvent>,
/// Receives InputEvents from all InputDeviceBindings that this pipeline owns.
device_event_receiver: UnboundedReceiver<input_device::InputEvent>,
/// The types of devices this pipeline supports.
input_device_types: Vec<input_device::InputDeviceType>,
/// The InputDeviceBindings bound to this pipeline.
input_device_bindings: InputDeviceBindingHashMap,
/// This node is bound to the lifetime of this InputPipeline.
/// Inspect data will be dumped for this pipeline as long as it exists.
inspect_node: fuchsia_inspect::Node,
/// The metrics logger.
metrics_logger: metrics::MetricsLogger,
}
impl InputPipeline {
/// Does the work that is common to building an input pipeline, across
/// the integration-test and production configurations.
fn new_common(
input_device_types: Vec<input_device::InputDeviceType>,
assembly: InputPipelineAssembly,
inspect_node: fuchsia_inspect::Node,
) -> Self {
let (pipeline_sender, receiver, tasks, metrics_logger) = assembly.into_components();
// Add properties to inspect node
inspect_node.record_string("supported_input_devices", input_device_types.iter().join(", "));
inspect_node.record_uint("handlers_registered", tasks.len() as u64);
inspect_node.record_uint("handlers_healthy", tasks.len() as u64);
// Add a stage that catches events which drop all the way down through the pipeline
// and logs them.
InputPipeline::catch_unhandled(receiver);
// The tasks in the assembly are all unstarted. Run them now.
InputPipeline::run(tasks);
let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
let input_device_bindings: InputDeviceBindingHashMap = Arc::new(Mutex::new(HashMap::new()));
InputPipeline {
pipeline_sender,
device_event_sender,
device_event_receiver,
input_device_types,
input_device_bindings,
inspect_node,
metrics_logger,
}
}
/// Creates a new [`InputPipeline`] for integration testing.
/// Unlike a production input pipeline, this pipeline will not monitor
/// `/dev/class/input-report` for devices.
///
/// # Parameters
/// - `input_device_types`: The types of devices the new [`InputPipeline`] will support.
/// - `assembly`: The input handlers that the [`InputPipeline`] sends InputEvents to.
pub fn new_for_test(
input_device_types: Vec<input_device::InputDeviceType>,
assembly: InputPipelineAssembly,
) -> Self {
let inspector = fuchsia_inspect::Inspector::default();
let root = inspector.root();
let test_node = root.create_child("input_pipeline");
Self::new_common(input_device_types, assembly, test_node)
}
/// Creates a new [`InputPipeline`] for production use.
///
/// # Parameters
/// - `input_device_types`: The types of devices the new [`InputPipeline`] will support.
/// - `assembly`: The input handlers that the [`InputPipeline`] sends InputEvents to.
/// - `inspect_node`: The root node for InputPipeline's Inspect tree
pub fn new(
input_device_types: Vec<input_device::InputDeviceType>,
assembly: InputPipelineAssembly,
inspect_node: fuchsia_inspect::Node,
metrics_logger: metrics::MetricsLogger,
) -> Result<Self, Error> {
let input_pipeline = Self::new_common(input_device_types, assembly, inspect_node);
let input_device_types = input_pipeline.input_device_types.clone();
let input_event_sender = input_pipeline.device_event_sender.clone();
let input_device_bindings = input_pipeline.input_device_bindings.clone();
let devices_node = input_pipeline.inspect_node.create_child("input_devices");
fasync::Task::local(async move {
// Watches the input device directory for new input devices. Creates new InputDeviceBindings
// that send InputEvents to `input_event_receiver`.
match async {
let dir_proxy = fuchsia_fs::directory::open_in_namespace(
input_device::INPUT_REPORT_PATH,
fio::OpenFlags::empty(),
)
.with_context(|| format!("failed to open {}", input_device::INPUT_REPORT_PATH))?;
let device_watcher =
Watcher::new(&dir_proxy).await.context("failed to create watcher")?;
Self::watch_for_devices(
device_watcher,
dir_proxy,
input_device_types,
input_event_sender,
input_device_bindings,
&devices_node,
false, /* break_on_idle */
metrics_logger.clone(),
)
.await
.context("failed to watch for devices")
}
.await
{
Ok(()) => {}
Err(err) => {
// This error is usually benign in tests: it means that the setup does not
// support dynamic device discovery. Almost no tests support dynamic
// device discovery, and they also do not need those.
metrics_logger.log_warn(
InputPipelineErrorMetricDimensionEvent::InputPipelineUnableToWatchForNewInputDevices,
std::format!(
"Input pipeline is unable to watch for new input devices: {:?}",
err
));
}
}
})
.detach();
Ok(input_pipeline)
}
/// Gets the input device bindings.
pub fn input_device_bindings(&self) -> &InputDeviceBindingHashMap {
&self.input_device_bindings
}
/// Gets the input device sender: this is the channel that should be cloned
/// and used for injecting events from the drivers into the input pipeline.
pub fn input_event_sender(&self) -> &UnboundedSender<input_device::InputEvent> {
&self.device_event_sender
}
/// Gets a list of input device types supported by this input pipeline.
pub fn input_device_types(&self) -> &Vec<input_device::InputDeviceType> {
&self.input_device_types
}
/// Forwards all input events into the input pipeline.
pub async fn handle_input_events(mut self) {
let metrics_logger_clone = self.metrics_logger.clone();
while let Some(input_event) = self.device_event_receiver.next().await {
if let Err(e) = self.pipeline_sender.unbounded_send(input_event) {
metrics_logger_clone.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineCouldNotForwardEventFromDriver,
std::format!("could not forward event from driver: {:?}", &e));
}
}
metrics_logger_clone.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineStopHandlingEvents,
"Input pipeline stopped handling input events.".to_string(),
);
}
/// Watches the input report directory for new input devices. Creates InputDeviceBindings
/// if new devices match a type in `device_types`.
///
/// # Parameters
/// - `device_watcher`: Watches the input report directory for new devices.
/// - `dir_proxy`: The directory containing InputDevice connections.
/// - `device_types`: The types of devices to watch for.
/// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
/// - `bindings`: Holds all the InputDeviceBindings
/// - `input_devices_node`: The parent node for all device bindings' inspect nodes.
/// - `break_on_idle`: If true, stops watching for devices once all existing devices are handled.
/// - `metrics_logger`: The metrics logger.
///
/// # Errors
/// If the input report directory or a file within it cannot be read.
async fn watch_for_devices(
mut device_watcher: Watcher,
dir_proxy: fio::DirectoryProxy,
device_types: Vec<input_device::InputDeviceType>,
input_event_sender: UnboundedSender<input_device::InputEvent>,
bindings: InputDeviceBindingHashMap,
input_devices_node: &fuchsia_inspect::Node,
break_on_idle: bool,
metrics_logger: metrics::MetricsLogger,
) -> Result<(), Error> {
// Add non-static properties to inspect node.
let devices_discovered = input_devices_node.create_uint("devices_discovered", 0);
let devices_connected = input_devices_node.create_uint("devices_connected", 0);
while let Some(msg) = device_watcher.try_next().await? {
if let Ok(filename) = msg.filename.into_os_string().into_string() {
if filename == "." {
continue;
}
let pathbuf = PathBuf::from(filename.clone());
match msg.event {
WatchEvent::EXISTING | WatchEvent::ADD_FILE => {
tracing::info!("found input device {}", filename);
devices_discovered.add(1);
let device_proxy =
input_device::get_device_from_dir_entry_path(&dir_proxy, &pathbuf)?;
add_device_bindings(
&device_types,
&filename,
device_proxy,
&input_event_sender,
&bindings,
filename.parse::<u32>().unwrap_or_default(),
input_devices_node,
Some(&devices_connected),
metrics_logger.clone(),
)
.await;
}
WatchEvent::IDLE => {
if break_on_idle {
break;
}
}
_ => (),
}
}
}
// Ensure inspect properties persist for debugging if device watch loop ends.
input_devices_node.record(devices_discovered);
input_devices_node.record(devices_connected);
Err(format_err!("Input pipeline stopped watching for new input devices."))
}
/// Handles the incoming InputDeviceRegistryRequestStream.
///
/// This method will end when the request stream is closed. If the stream closes with an
/// error the error will be returned in the Result.
///
/// **NOTE**: Only one stream is handled at a time. https://fxbug.dev/42061078
///
/// # Parameters
/// - `stream`: The stream of InputDeviceRegistryRequests.
/// - `device_types`: The types of devices to watch for.
/// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
/// - `bindings`: Holds all the InputDeviceBindings associated with the InputPipeline.
/// - `device_id`: The device id of the associated bindings.
/// - `input_devices_node`: The parent node for all injected devices' inspect nodes.
/// - `metrics_logger`: The metrics logger.
pub async fn handle_input_device_registry_request_stream(
mut stream: fidl_fuchsia_input_injection::InputDeviceRegistryRequestStream,
device_types: &Vec<input_device::InputDeviceType>,
input_event_sender: &UnboundedSender<input_device::InputEvent>,
bindings: &InputDeviceBindingHashMap,
device_id: u32,
input_devices_node: &fuchsia_inspect::Node,
metrics_logger: metrics::MetricsLogger,
) -> Result<(), Error> {
while let Some(request) = stream
.try_next()
.await
.context("Error handling input device registry request stream")?
{
match request {
fidl_fuchsia_input_injection::InputDeviceRegistryRequest::Register {
device,
..
} => {
// Add a binding if the device is a type being tracked
let device_proxy = device.into_proxy().expect("Error getting device proxy.");
add_device_bindings(
device_types,
&format!("input-device-registry-{}", device_id),
device_proxy,
input_event_sender,
bindings,
device_id,
input_devices_node,
None,
metrics_logger.clone(),
)
.await;
}
}
}
Ok(())
}
/// Starts all tasks in an asynchronous executor.
fn run(tasks: Vec<fuchsia_async::Task<()>>) {
fasync::Task::local(async move {
futures::future::join_all(tasks).await;
panic!("Runner task is not supposed to terminate.")
})
.detach();
}
/// Installs a handler that will print a warning for each event that is received
/// unhandled from this receiver.
fn catch_unhandled(mut receiver: UnboundedReceiver<input_device::InputEvent>) {
fasync::Task::local(async move {
while let Some(event) = receiver.next().await {
if event.handled == input_device::Handled::No {
tracing::warn!("unhandled input event: {:?}", &event);
}
}
panic!("unhandled event catcher is not supposed to terminate.");
})
.detach();
}
}
/// Adds `InputDeviceBinding`s to `bindings` for all `device_types` exposed by `device_proxy`.
///
/// # Parameters
/// - `device_types`: The types of devices to watch for.
/// - `device_proxy`: A proxy to the input device.
/// - `input_event_sender`: The channel new InputDeviceBindings will send InputEvents to.
/// - `bindings`: Holds all the InputDeviceBindings associated with the InputPipeline.
/// - `device_id`: The device id of the associated bindings.
/// - `input_devices_node`: The parent node for all device bindings' inspect nodes.
///
/// # Note
/// This will create multiple bindings, in the case where
/// * `device_proxy().get_descriptor()` returns a `fidl_fuchsia_input_report::DeviceDescriptor`
/// with multiple table fields populated, and
/// * multiple populated table fields correspond to device types present in `device_types`
///
/// This is used, for example, to support the Atlas touchpad. In that case, a single
/// node in `/dev/class/input-report` provides both a `fuchsia.input.report.MouseDescriptor` and
/// a `fuchsia.input.report.TouchDescriptor`.
async fn add_device_bindings(
device_types: &Vec<input_device::InputDeviceType>,
filename: &String,
device_proxy: fidl_fuchsia_input_report::InputDeviceProxy,
input_event_sender: &UnboundedSender<input_device::InputEvent>,
bindings: &InputDeviceBindingHashMap,
device_id: u32,
input_devices_node: &fuchsia_inspect::Node,
devices_connected: Option<&fuchsia_inspect::UintProperty>,
metrics_logger: metrics::MetricsLogger,
) {
let mut matched_device_types = vec![];
if let Ok(descriptor) = device_proxy.get_descriptor().await {
for device_type in device_types {
if input_device::is_device_type(&descriptor, *device_type).await {
matched_device_types.push(device_type);
match devices_connected {
Some(dev_connected) => {
let _ = dev_connected.add(1);
}
None => (),
};
}
}
if matched_device_types.is_empty() {
tracing::info!(
"device {} did not match any supported device types: {:?}",
filename,
device_types
);
let device_node = input_devices_node.create_child(format!("{}_Unsupported", filename));
let mut health = fuchsia_inspect::health::Node::new(&device_node);
health.set_unhealthy("Unsupported device type.");
device_node.record(health);
input_devices_node.record(device_node);
return;
}
} else {
metrics_logger.clone().log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineNoDeviceDescriptor,
std::format!("cannot bind device {} without a device descriptor", filename),
);
return;
}
tracing::info!(
"binding {} to device types: {}",
filename,
matched_device_types
.iter()
.fold(String::new(), |device_types_string, device_type| device_types_string
+ &format!("{:?}, ", device_type))
);
let mut new_bindings: Vec<BoxedInputDeviceBinding> = vec![];
for device_type in matched_device_types {
// Clone `device_proxy`, so that multiple bindings (e.g. a `MouseBinding` and a
// `TouchBinding`) can read data from the same `/dev/class/input-report` node.
//
// There's no conflict in having multiple bindings read from the same node,
// since:
// * each binding will create its own `fuchsia.input.report.InputReportsReader`, and
// * the device driver will copy each incoming report to each connected reader.
//
// This does mean that reports from the Atlas touchpad device get read twice
// (by a `MouseBinding` and a `TouchBinding`), regardless of whether the device
// is operating in mouse mode or touchpad mode.
//
// This hasn't been an issue because:
// * Semantically: things are fine, because each binding discards irrelevant reports.
// (E.g. `MouseBinding` discards anything that isn't a `MouseInputReport`), and
// * Performance wise: things are fine, because the data rate of the touchpad is low
// (125 HZ).
//
// If we add additional cases where bindings share an underlying `input-report` node,
// we might consider adding a multiplexing binding, to avoid reading duplicate reports.
let proxy = device_proxy.clone();
let device_node = input_devices_node.create_child(format!("{}_{}", filename, device_type));
match input_device::get_device_binding(
*device_type,
proxy,
device_id,
input_event_sender.clone(),
device_node,
metrics_logger.clone(),
)
.await
{
Ok(binding) => new_bindings.push(binding),
Err(e) => {
metrics_logger.log_error(
InputPipelineErrorMetricDimensionEvent::InputPipelineFailedToBind,
std::format!("failed to bind {} as {:?}: {}", filename, device_type, e),
);
}
}
}
if !new_bindings.is_empty() {
let mut bindings = bindings.lock().await;
bindings.entry(device_id).or_insert(Vec::new()).extend(new_bindings);
}
}
#[cfg(test)]
mod tests {
use {
super::*,
crate::fake_input_device_binding,
crate::input_device::InputDeviceBinding,
crate::mouse_binding,
crate::mouse_model_database,
crate::observe_fake_events_input_handler,
crate::utils::Position,
diagnostics_assertions::AnyProperty,
fidl::endpoints::{create_proxy, create_proxy_and_stream, create_request_stream},
fuchsia_async as fasync, fuchsia_zircon as zx,
futures::FutureExt,
pretty_assertions::assert_eq,
rand::Rng,
std::collections::HashSet,
vfs::{
directory::entry_container::Directory, execution_scope::ExecutionScope, path::Path,
pseudo_directory, service as pseudo_fs_service,
},
};
const COUNTS_PER_MM: u32 = 12;
/// Returns the InputEvent sent over `sender`.
///
/// # Parameters
/// - `sender`: The channel to send the InputEvent over.
fn send_input_event(
sender: UnboundedSender<input_device::InputEvent>,
) -> input_device::InputEvent {
let mut rng = rand::thread_rng();
let offset = Position { x: rng.gen_range(0..10) as f32, y: rng.gen_range(0..10) as f32 };
let input_event = input_device::InputEvent {
device_event: input_device::InputDeviceEvent::Mouse(mouse_binding::MouseEvent::new(
mouse_binding::MouseLocation::Relative(mouse_binding::RelativeLocation {
millimeters: Position {
x: offset.x / COUNTS_PER_MM as f32,
y: offset.y / COUNTS_PER_MM as f32,
},
}),
None, /* wheel_delta_v */
None, /* wheel_delta_h */
mouse_binding::MousePhase::Move,
HashSet::new(),
HashSet::new(),
None, /* is_precision_scroll */
)),
device_descriptor: input_device::InputDeviceDescriptor::Mouse(
mouse_binding::MouseDeviceDescriptor {
device_id: 1,
absolute_x_range: None,
absolute_y_range: None,
wheel_v_range: None,
wheel_h_range: None,
buttons: None,
counts_per_mm: COUNTS_PER_MM,
},
),
event_time: zx::Time::get_monotonic(),
handled: input_device::Handled::No,
trace_id: None,
};
match sender.unbounded_send(input_event.clone()) {
Err(_) => assert!(false),
_ => {}
}
input_event
}
/// Returns a MouseDescriptor on an InputDeviceRequest.
///
/// # Parameters
/// - `input_device_request`: The request to handle.
fn handle_input_device_request(
input_device_request: fidl_fuchsia_input_report::InputDeviceRequest,
) {
match input_device_request {
fidl_fuchsia_input_report::InputDeviceRequest::GetDescriptor { responder } => {
let _ = responder.send(&fidl_fuchsia_input_report::DeviceDescriptor {
device_info: None,
mouse: Some(fidl_fuchsia_input_report::MouseDescriptor {
input: Some(fidl_fuchsia_input_report::MouseInputDescriptor {
movement_x: None,
movement_y: None,
scroll_v: None,
scroll_h: None,
buttons: Some(vec![0]),
position_x: None,
position_y: None,
..Default::default()
}),
..Default::default()
}),
sensor: None,
touch: None,
keyboard: None,
consumer_control: None,
..Default::default()
});
}
_ => {}
}
}
/// Tests that an input pipeline handles events from multiple devices.
#[fasync::run_singlethreaded(test)]
async fn multiple_devices_single_handler() {
// Create two fake device bindings.
let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
let first_device_binding =
fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
let second_device_binding =
fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
// Create a fake input handler.
let (handler_event_sender, mut handler_event_receiver) =
futures::channel::mpsc::channel(100);
let input_handler = observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
handler_event_sender,
);
// Build the input pipeline.
let (sender, receiver, tasks, _) =
InputPipelineAssembly::new(metrics::MetricsLogger::default())
.add_handler(input_handler)
.into_components();
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
let input_pipeline = InputPipeline {
pipeline_sender: sender,
device_event_sender,
device_event_receiver,
input_device_types: vec![],
input_device_bindings: Arc::new(Mutex::new(HashMap::new())),
inspect_node: test_node,
metrics_logger: metrics::MetricsLogger::default(),
};
InputPipeline::catch_unhandled(receiver);
InputPipeline::run(tasks);
// Send an input event from each device.
let first_device_event = send_input_event(first_device_binding.input_event_sender());
let second_device_event = send_input_event(second_device_binding.input_event_sender());
// Run the pipeline.
fasync::Task::local(async {
input_pipeline.handle_input_events().await;
})
.detach();
// Assert the handler receives the events.
let first_handled_event = handler_event_receiver.next().await;
assert_eq!(first_handled_event, Some(first_device_event));
let second_handled_event = handler_event_receiver.next().await;
assert_eq!(second_handled_event, Some(second_device_event));
}
/// Tests that an input pipeline handles events through multiple input handlers.
#[fasync::run_singlethreaded(test)]
async fn single_device_multiple_handlers() {
// Create two fake device bindings.
let (device_event_sender, device_event_receiver) = futures::channel::mpsc::unbounded();
let input_device_binding =
fake_input_device_binding::FakeInputDeviceBinding::new(device_event_sender.clone());
// Create two fake input handlers.
let (first_handler_event_sender, mut first_handler_event_receiver) =
futures::channel::mpsc::channel(100);
let first_input_handler =
observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
first_handler_event_sender,
);
let (second_handler_event_sender, mut second_handler_event_receiver) =
futures::channel::mpsc::channel(100);
let second_input_handler =
observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
second_handler_event_sender,
);
// Build the input pipeline.
let (sender, receiver, tasks, _) =
InputPipelineAssembly::new(metrics::MetricsLogger::default())
.add_handler(first_input_handler)
.add_handler(second_input_handler)
.into_components();
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
let input_pipeline = InputPipeline {
pipeline_sender: sender,
device_event_sender,
device_event_receiver,
input_device_types: vec![],
input_device_bindings: Arc::new(Mutex::new(HashMap::new())),
inspect_node: test_node,
metrics_logger: metrics::MetricsLogger::default(),
};
InputPipeline::catch_unhandled(receiver);
InputPipeline::run(tasks);
// Send an input event.
let input_event = send_input_event(input_device_binding.input_event_sender());
// Run the pipeline.
fasync::Task::local(async {
input_pipeline.handle_input_events().await;
})
.detach();
// Assert both handlers receive the event.
let first_handler_event = first_handler_event_receiver.next().await;
assert_eq!(first_handler_event, Some(input_event.clone()));
let second_handler_event = second_handler_event_receiver.next().await;
assert_eq!(second_handler_event, Some(input_event));
}
/// Tests that a single mouse device binding is created for the one input device in the
/// input report directory.
#[fasync::run_singlethreaded(test)]
async fn watch_devices_one_match_exists() {
// Create a file in a pseudo directory that represents an input device.
let mut count: i8 = 0;
let dir = pseudo_directory! {
"001" => pseudo_fs_service::host(
move |mut request_stream: fidl_fuchsia_input_report::InputDeviceRequestStream| {
async move {
while count < 3 {
if let Some(input_device_request) =
request_stream.try_next().await.unwrap()
{
handle_input_device_request(input_device_request);
count += 1;
}
}
}.boxed()
},
)
};
// Create a Watcher on the pseudo directory.
let pseudo_dir_clone = dir.clone();
let (dir_proxy_for_watcher, dir_server_for_watcher) =
create_proxy::<fio::DirectoryMarker>().unwrap();
let server_end_for_watcher = dir_server_for_watcher.into_channel().into();
let scope_for_watcher = ExecutionScope::new();
dir.open(scope_for_watcher, fio::OpenFlags::empty(), Path::dot(), server_end_for_watcher);
let device_watcher = Watcher::new(&dir_proxy_for_watcher).await.unwrap();
// Get a proxy to the pseudo directory for the input pipeline. The input pipeline uses this
// proxy to get connections to input devices.
let (dir_proxy_for_pipeline, dir_server_for_pipeline) =
create_proxy::<fio::DirectoryMarker>().unwrap();
let server_end_for_pipeline = dir_server_for_pipeline.into_channel().into();
let scope_for_pipeline = ExecutionScope::new();
pseudo_dir_clone.open(
scope_for_pipeline,
fio::OpenFlags::empty(),
Path::dot(),
server_end_for_pipeline,
);
let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
let bindings: InputDeviceBindingHashMap = Arc::new(Mutex::new(HashMap::new()));
let supported_device_types = vec![input_device::InputDeviceType::Mouse];
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
test_node.record_string(
"supported_input_devices",
supported_device_types.clone().iter().join(", "),
);
let input_devices = test_node.create_child("input_devices");
// Assert that inspect tree is initialized with no devices.
diagnostics_assertions::assert_data_tree!(inspector, root: {
input_pipeline: {
supported_input_devices: "Mouse",
input_devices: {}
}
});
let _ = InputPipeline::watch_for_devices(
device_watcher,
dir_proxy_for_pipeline,
supported_device_types,
input_event_sender,
bindings.clone(),
&input_devices,
true, /* break_on_idle */
metrics::MetricsLogger::default(),
)
.await;
// Assert that one mouse device with accurate device id was found.
let bindings_hashmap = bindings.lock().await;
assert_eq!(bindings_hashmap.len(), 1);
let bindings_vector = bindings_hashmap.get(&1);
assert!(bindings_vector.is_some());
assert_eq!(bindings_vector.unwrap().len(), 1);
let boxed_mouse_binding = bindings_vector.unwrap().get(0);
assert!(boxed_mouse_binding.is_some());
assert_eq!(
boxed_mouse_binding.unwrap().get_device_descriptor(),
input_device::InputDeviceDescriptor::Mouse(mouse_binding::MouseDeviceDescriptor {
device_id: 1,
absolute_x_range: None,
absolute_y_range: None,
wheel_v_range: None,
wheel_h_range: None,
buttons: Some(vec![0]),
counts_per_mm: mouse_model_database::db::DEFAULT_COUNTS_PER_MM,
})
);
// Assert that inspect tree reflects new device discovered and connected.
diagnostics_assertions::assert_data_tree!(inspector, root: {
input_pipeline: {
supported_input_devices: "Mouse",
input_devices: {
devices_discovered: 1u64,
devices_connected: 1u64,
"001_Mouse": contains {
reports_received_count: 0u64,
reports_filtered_count: 0u64,
events_generated: 0u64,
last_received_timestamp_ns: 0u64,
last_generated_timestamp_ns: 0u64,
"fuchsia.inspect.Health": {
status: "OK",
// Timestamp value is unpredictable and not relevant in this context,
// so we only assert that the property is present.
start_timestamp_nanos: AnyProperty
},
}
}
}
});
}
/// Tests that no device bindings are created because the input pipeline looks for keyboard devices
/// but only a mouse exists.
#[fasync::run_singlethreaded(test)]
async fn watch_devices_no_matches_exist() {
// Create a file in a pseudo directory that represents an input device.
let mut count: i8 = 0;
let dir = pseudo_directory! {
"001" => pseudo_fs_service::host(
move |mut request_stream: fidl_fuchsia_input_report::InputDeviceRequestStream| {
async move {
while count < 1 {
if let Some(input_device_request) =
request_stream.try_next().await.unwrap()
{
handle_input_device_request(input_device_request);
count += 1;
}
}
}.boxed()
},
)
};
// Create a Watcher on the pseudo directory.
let pseudo_dir_clone = dir.clone();
let (dir_proxy_for_watcher, dir_server_for_watcher) =
create_proxy::<fio::DirectoryMarker>().unwrap();
let server_end_for_watcher = dir_server_for_watcher.into_channel().into();
let scope_for_watcher = ExecutionScope::new();
dir.open(scope_for_watcher, fio::OpenFlags::empty(), Path::dot(), server_end_for_watcher);
let device_watcher = Watcher::new(&dir_proxy_for_watcher).await.unwrap();
// Get a proxy to the pseudo directory for the input pipeline. The input pipeline uses this
// proxy to get connections to input devices.
let (dir_proxy_for_pipeline, dir_server_for_pipeline) =
create_proxy::<fio::DirectoryMarker>().unwrap();
let server_end_for_pipeline = dir_server_for_pipeline.into_channel().into();
let scope_for_pipeline = ExecutionScope::new();
pseudo_dir_clone.open(
scope_for_pipeline,
fio::OpenFlags::empty(),
Path::dot(),
server_end_for_pipeline,
);
let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
let bindings: InputDeviceBindingHashMap = Arc::new(Mutex::new(HashMap::new()));
let supported_device_types = vec![input_device::InputDeviceType::Keyboard];
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
test_node.record_string(
"supported_input_devices",
supported_device_types.clone().iter().join(", "),
);
let input_devices = test_node.create_child("input_devices");
// Assert that inspect tree is initialized with no devices.
diagnostics_assertions::assert_data_tree!(inspector, root: {
input_pipeline: {
supported_input_devices: "Keyboard",
input_devices: {}
}
});
let _ = InputPipeline::watch_for_devices(
device_watcher,
dir_proxy_for_pipeline,
supported_device_types,
input_event_sender,
bindings.clone(),
&input_devices,
true, /* break_on_idle */
metrics::MetricsLogger::default(),
)
.await;
// Assert that no devices were found.
let bindings = bindings.lock().await;
assert_eq!(bindings.len(), 0);
// Assert that inspect tree reflects new device discovered, but not connected.
diagnostics_assertions::assert_data_tree!(inspector, root: {
input_pipeline: {
supported_input_devices: "Keyboard",
input_devices: {
devices_discovered: 1u64,
devices_connected: 0u64,
"001_Unsupported": {
"fuchsia.inspect.Health": {
status: "UNHEALTHY",
message: "Unsupported device type.",
// Timestamp value is unpredictable and not relevant in this context,
// so we only assert that the property is present.
start_timestamp_nanos: AnyProperty
},
}
}
}
});
}
/// Tests that a single keyboard device binding is created for the input device registered
/// through InputDeviceRegistry.
#[fasync::run_singlethreaded(test)]
async fn handle_input_device_registry_request_stream() {
let (input_device_registry_proxy, input_device_registry_request_stream) =
create_proxy_and_stream::<fidl_fuchsia_input_injection::InputDeviceRegistryMarker>()
.unwrap();
let (input_device_client_end, mut input_device_request_stream) =
create_request_stream::<fidl_fuchsia_input_report::InputDeviceMarker>().unwrap();
let device_types = vec![input_device::InputDeviceType::Mouse];
let (input_event_sender, _input_event_receiver) = futures::channel::mpsc::unbounded();
let bindings: InputDeviceBindingHashMap = Arc::new(Mutex::new(HashMap::new()));
// Handle input device requests.
let mut count: i8 = 0;
fasync::Task::local(async move {
// Register a device.
let _ = input_device_registry_proxy.register(input_device_client_end);
while count < 3 {
if let Some(input_device_request) =
input_device_request_stream.try_next().await.unwrap()
{
handle_input_device_request(input_device_request);
count += 1;
}
}
// End handle_input_device_registry_request_stream() by taking the event stream.
input_device_registry_proxy.take_event_stream();
})
.detach();
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
// Start listening for InputDeviceRegistryRequests.
let bindings_clone = bindings.clone();
let _ = InputPipeline::handle_input_device_registry_request_stream(
input_device_registry_request_stream,
&device_types,
&input_event_sender,
&bindings_clone,
0,
&test_node,
metrics::MetricsLogger::default(),
)
.await;
// Assert that a device was registered.
let bindings = bindings.lock().await;
assert_eq!(bindings.len(), 1);
}
// Tests that correct properties are added to inspect node when InputPipeline is created.
#[fasync::run_singlethreaded(test)]
async fn check_inspect_node_has_correct_properties() {
let device_types = vec![
input_device::InputDeviceType::Touch,
input_device::InputDeviceType::ConsumerControls,
];
let inspector = fuchsia_inspect::Inspector::default();
let test_node = inspector.root().create_child("input_pipeline");
// Create fake input handler for assembly
let (fake_handler_event_sender, _fake_handler_event_receiver) =
futures::channel::mpsc::channel(100);
let fake_input_handler =
observe_fake_events_input_handler::ObserveFakeEventsInputHandler::new(
fake_handler_event_sender,
);
let assembly = InputPipelineAssembly::new(metrics::MetricsLogger::default())
.add_handler(fake_input_handler);
let _test_input_pipeline = InputPipeline::new(
device_types,
assembly,
test_node,
metrics::MetricsLogger::default(),
);
diagnostics_assertions::assert_data_tree!(inspector, root: {
input_pipeline: {
supported_input_devices: "Touch, ConsumerControls",
handlers_registered: 1u64,
handlers_healthy: 1u64,
input_devices: {}
}
});
}
}