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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use crate::transport::device_selector::DeviceSelectorEvent;
use devd_rs;
use runloop::RunLoop;
use std::collections::HashMap;
use std::error::Error;
use std::ffi::OsString;
use std::sync::{mpsc::Sender, Arc};
use std::{fs, io};
const POLL_TIMEOUT: usize = 100;
pub enum Event {
Add(OsString),
Remove(OsString),
}
impl Event {
fn from_devd(event: devd_rs::Event) -> Option<Self> {
match event {
devd_rs::Event::Attach {
ref dev,
parent: _,
location: _,
} if dev.starts_with("uhid") => Some(Event::Add(("/dev/".to_owned() + dev).into())),
devd_rs::Event::Detach {
ref dev,
parent: _,
location: _,
} if dev.starts_with("uhid") => Some(Event::Remove(("/dev/".to_owned() + dev).into())),
_ => None,
}
}
}
fn convert_error(e: devd_rs::Error) -> io::Error {
e.into()
}
pub struct Monitor<F>
where
F: Fn(OsString, Sender<DeviceSelectorEvent>, Sender<crate::StatusUpdate>, &dyn Fn() -> bool)
+ Sync,
{
runloops: HashMap<OsString, RunLoop>,
new_device_cb: Arc<F>,
selector_sender: Sender<DeviceSelectorEvent>,
status_sender: Sender<crate::StatusUpdate>,
}
impl<F> Monitor<F>
where
F: Fn(OsString, Sender<DeviceSelectorEvent>, Sender<crate::StatusUpdate>, &dyn Fn() -> bool)
+ Send
+ Sync
+ 'static,
{
pub fn new(
new_device_cb: F,
selector_sender: Sender<DeviceSelectorEvent>,
status_sender: Sender<crate::StatusUpdate>,
) -> Self {
Self {
runloops: HashMap::new(),
new_device_cb: Arc::new(new_device_cb),
selector_sender,
status_sender,
}
}
pub fn run(&mut self, alive: &dyn Fn() -> bool) -> Result<(), Box<dyn Error>> {
let mut ctx = devd_rs::Context::new().map_err(convert_error)?;
let mut initial_devs = Vec::new();
// Iterate all existing devices.
for dev in (fs::read_dir("/dev")?).flatten() {
let filename_ = dev.file_name();
let filename = filename_.to_str().unwrap_or("");
if filename.starts_with("uhid") {
let path = OsString::from("/dev/".to_owned() + filename);
initial_devs.push(path.clone());
self.add_device(path);
}
}
let _ = self
.selector_sender
.send(DeviceSelectorEvent::DevicesAdded(initial_devs));
// Loop until we're stopped by the controlling thread, or fail.
while alive() {
// Wait for new events, break on failure.
match ctx.wait_for_event(POLL_TIMEOUT) {
Err(devd_rs::Error::Timeout) => (),
Err(e) => return Err(convert_error(e).into()),
Ok(event) => {
if let Some(event) = Event::from_devd(event) {
self.process_event(event);
}
}
}
}
// Remove all tracked devices.
self.remove_all_devices();
Ok(())
}
fn process_event(&mut self, event: Event) {
match event {
Event::Add(path) => {
let _ = self
.selector_sender
.send(DeviceSelectorEvent::DevicesAdded(vec![path.clone()]));
self.add_device(path);
}
Event::Remove(path) => {
self.remove_device(path);
}
}
}
fn add_device(&mut self, path: OsString) {
let f = self.new_device_cb.clone();
let selector_sender = self.selector_sender.clone();
let status_sender = self.status_sender.clone();
let key = path.clone();
debug!("Adding device {}", key.to_string_lossy());
let runloop = RunLoop::new(move |alive| {
if alive() {
f(path, selector_sender, status_sender, alive);
}
});
if let Ok(runloop) = runloop {
self.runloops.insert(key, runloop);
}
}
fn remove_device(&mut self, path: OsString) {
let _ = self
.selector_sender
.send(DeviceSelectorEvent::DeviceRemoved(path.clone()));
debug!("Removing device {}", path.to_string_lossy());
if let Some(runloop) = self.runloops.remove(&path) {
runloop.cancel();
}
}
fn remove_all_devices(&mut self) {
while !self.runloops.is_empty() {
let path = self.runloops.keys().next().unwrap().clone();
self.remove_device(path);
}
}
}
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