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|
use super::*;
use libc::{ c_void };
use crate::sys;
use std::mem;
use std::sync::{ Arc, Weak };
use std::panic::*;
use std::any::Any;
use std::process::abort;
pub unsafe trait Callback {
const ID: i32;
const SIZE: i32;
unsafe fn from_raw(raw: *mut c_void) -> Self;
}
/// A handled that can be used to remove a callback
/// at a later point.
///
/// Removes the callback when dropped
pub struct CallbackHandle<Manager = ClientManager> {
handle: *mut c_void,
inner: Weak<Inner<Manager>>,
}
unsafe impl <Manager> Send for CallbackHandle<Manager> {}
impl <Manager> Drop for CallbackHandle<Manager> {
fn drop(&mut self) {
if let Some(inner) = self.inner.upgrade() {
let mut cb = inner.callbacks.lock().unwrap();
if let Some(pos) = cb.callbacks.iter().position(|v| *v == self.handle) {
cb.callbacks.swap_remove(pos);
unsafe { sys::delete_rust_callback(self.handle); }
}
}
}
}
fn print_err(err: Box<dyn Any>) {
if let Some(err) = err.downcast_ref::<&str>() {
println!("Steam callback panicked: {}", err);
} else if let Some(err) = err.downcast_ref::<String>() {
println!("Steam callback panicked: {}", err);
} else {
println!("Steam callback panicked");
}
}
pub(crate) unsafe fn register_callback<C, F, Manager>(inner: &Arc<Inner<Manager>>, f: F, game_server: bool) -> CallbackHandle<Manager>
where C: Callback,
F: FnMut(C) + Send + 'static
{
unsafe extern "C" fn run<C, F>(_: *mut c_void, userdata: *mut c_void, param: *mut c_void)
where C: Callback,
F: FnMut(C) + Send + 'static
{
let func: &mut F = &mut *(userdata as *mut F);
let param = C::from_raw(param);
let res = catch_unwind(AssertUnwindSafe(||
func(param)
));
if let Err(err) = res {
print_err(err);
abort();
}
}
unsafe extern "C" fn run_extra<C, F>(cb: *mut c_void, userdata: *mut c_void, param: *mut c_void, _: u8, _: sys::SteamAPICall_t)
where C: Callback,
F: FnMut(C) + Send + 'static
{
run::<C, F>(cb, userdata, param);
}
unsafe extern "C" fn dealloc<C, F>(cb: *mut c_void, userdata: *mut c_void)
where C: Callback,
F: FnMut(C) + Send + 'static
{
sys::SteamAPI_UnregisterCallback(cb);
let func: Box<F> = Box::from_raw(userdata as _);
let res = catch_unwind(AssertUnwindSafe(move ||
// Its possible for callback to panic whilst being dropped
drop(func)
));
if let Err(err) = res {
print_err(err);
abort();
}
}
let data = sys::CallbackData {
param_size: C::SIZE as _,
userdata: Box::into_raw(Box::new(f)) as _,
run: run::<C, F> as _,
run_extra: run_extra::<C, F> as _,
dealloc: dealloc::<C, F> as _,
};
let flags = if game_server { 0x02 } else { 0x00 };
let ptr = sys::create_rust_callback(flags, C::ID as _, data);
sys::SteamAPI_RegisterCallback(ptr, C::ID as _);
let mut cbs = inner.callbacks.lock().unwrap();
cbs.callbacks.push(ptr);
CallbackHandle {
handle: ptr,
inner: Arc::downgrade(inner),
}
}
pub(crate) unsafe fn register_call_result<C, F, Manager>(inner: &Arc<Inner<Manager>>, api_call: sys::SteamAPICall_t, callback_id: i32, f: F)
where F: for <'a> FnMut(&'a C, bool) + 'static + Send
{
struct CallData<F, Manager> {
func: F,
api_call: sys::SteamAPICall_t,
inner: Weak<Inner<Manager>>,
}
unsafe extern "C" fn run<C, F, Manager>(cb: *mut c_void, userdata: *mut c_void, param: *mut c_void)
where F: for<'a> FnMut(&'a C, bool) + Send + 'static
{
let data: &mut CallData<F, Manager> = &mut *(userdata as *mut CallData<F, Manager>);
let res = catch_unwind(AssertUnwindSafe(||
(data.func)(&*(param as *const _), false)
));
if let Err(err) = res {
print_err(err);
abort();
}
sys::delete_rust_callback(cb);
}
unsafe extern "C" fn run_extra<C, F, Manager>(cb: *mut c_void, userdata: *mut c_void, param: *mut c_void, io_error: u8, api_call: sys::SteamAPICall_t)
where F: for<'a> FnMut(&'a C, bool) + Send + 'static
{
let data: &mut CallData<F, Manager> = &mut *(userdata as *mut CallData<F, Manager>);
if api_call == data.api_call {
let res = catch_unwind(AssertUnwindSafe(||
(data.func)(&*(param as *const _), io_error != 0)
));
if let Err(err) = res {
print_err(err);
abort();
}
sys::delete_rust_callback(cb);
}
}
unsafe extern "C" fn dealloc<C, F, Manager>(_cb: *mut c_void, userdata: *mut c_void)
where F: for <'a> FnMut(&'a C, bool) + Send + 'static
{
let data: Box<CallData<F, Manager>> = Box::from_raw(userdata as _);
if let Some(inner) = data.inner.upgrade() {
let mut cbs = inner.callbacks.lock().unwrap();
cbs.call_results.remove(&data.api_call);
}
let res = catch_unwind(AssertUnwindSafe(move ||
// Its possible for callback to panic whilst being dropped
drop(data)
));
if let Err(err) = res {
print_err(err);
abort();
}
}
let userdata = CallData {
func: f,
api_call: api_call,
inner: Arc::downgrade(&inner),
};
let data = sys::CallbackData {
param_size: mem::size_of::<C>() as _,
userdata: Box::into_raw(Box::new(userdata)) as _,
run: run::<C, F, Manager>,
run_extra: run_extra::<C, F, Manager>,
dealloc: dealloc::<C, F, Manager>,
};
let ptr = sys::create_rust_callback(0x00, callback_id, data);
sys::SteamAPI_RegisterCallResult(ptr, api_call);
let mut cbs = inner.callbacks.lock().unwrap();
cbs.call_results.insert(api_call, ptr);
}
|