Revision control
Copy as Markdown
Other Tools
/* 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
use crate::transport::device_selector::DeviceSelectorEvent;
use crate::transport::platform::fd::Fd;
use runloop::RunLoop;
use std::collections::HashMap;
use std::error::Error;
use std::ffi::OsString;
use std::sync::{mpsc::Sender, Arc};
use std::thread;
use std::time::Duration;
// XXX Should use drvctl, but it doesn't do pubsub properly yet so
// DRVGETEVENT requires write access to /dev/drvctl. Instead, for now,
// just poll every 500ms.
const POLL_TIMEOUT: u64 = 500;
#[derive(Debug)]
pub struct WrappedOpenDevice {
pub fd: Fd,
pub os_path: OsString,
}
pub struct Monitor<F>
where
F: Fn(
WrappedOpenDevice,
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(
WrappedOpenDevice,
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>> {
// Loop until we're stopped by the controlling thread, or fail.
while alive() {
for n in 0..100 {
let uhidpath = OsString::from(format!("/dev/uhid{n}"));
match Fd::open(&uhidpath, libc::O_RDWR | libc::O_CLOEXEC) {
Ok(uhid) => {
// The device is available if it can be opened.
let _ = self
.selector_sender
.send(DeviceSelectorEvent::DevicesAdded(vec![uhidpath.clone()]));
self.add_device(WrappedOpenDevice {
fd: uhid,
os_path: uhidpath,
});
}
Err(ref err) => match err.raw_os_error() {
Some(libc::EBUSY) => continue,
Some(libc::ENOENT) => break,
_ => self.remove_device(uhidpath),
},
}
}
thread::sleep(Duration::from_millis(POLL_TIMEOUT));
}
// Remove all tracked devices.
self.remove_all_devices();
Ok(())
}
fn add_device(&mut self, fido: WrappedOpenDevice) {
let f = self.new_device_cb.clone();
let selector_sender = self.selector_sender.clone();
let status_sender = self.status_sender.clone();
let key = fido.os_path.clone();
debug!("Adding device {}", key.to_string_lossy());
let runloop = RunLoop::new(move |alive| {
if alive() {
f(fido, 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);
}
}
}