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use_prelude!();
use std::sync::{Mutex, Weak};
use super::{
presence_observer::{
PeersObserver, PeersObserverCtx, PresenceObserver, PresenceObserverCtx,
WeakPresenceObserver,
},
v2::V2Presence,
v3::PresenceGraph,
};
pub struct Presence {
ditto: Arc<ffi_sdk::BoxedDitto>,
observers_v2: Mutex<Vec<Weak<PeersObserverCtx>>>,
observers_v3: Mutex<Vec<WeakPresenceObserver>>,
registered: Mutex<bool>,
}
impl Presence {
pub(crate) fn new(ditto: Arc<ffi_sdk::BoxedDitto>) -> Self {
Self {
ditto,
observers_v2: Mutex::new(Vec::new()),
observers_v3: Mutex::new(Vec::new()),
registered: Mutex::new(false),
}
}
pub(crate) unsafe extern "C" fn on_event_v2(ctx: *mut c_void, json: char_p::Ref<'_>) {
let weak_ctx: &Weak<_> =
&*::core::mem::ManuallyDrop::new(Weak::from_raw(ctx.cast::<Presence>()));
if let Some(strong_ctx) = weak_ctx.upgrade() {
let presence_json_str = json.to_str();
strong_ctx.on_presence_v2(presence_json_str);
}
}
pub(crate) unsafe extern "C" fn on_event_v3(ctx: *mut c_void, json: char_p::Ref<'_>) {
let weak_ctx: &Weak<_> =
&*::core::mem::ManuallyDrop::new(Weak::from_raw(ctx.cast::<Presence>()));
if let Some(strong_ctx) = weak_ctx.upgrade() {
let presence_json_str = json.to_str();
strong_ctx.on_presence_v3(presence_json_str);
}
}
fn on_presence_v2(&self, json_str: &str) {
let mut observers_v2 = self.observers_v2.lock().unwrap();
if observers_v2.is_empty() {
return;
}
if let Ok(presence_v2) = serde_json::from_str::<V2Presence>(json_str) {
observers_v2.retain(|weak_observer| {
if let Some(observer) = weak_observer.upgrade() {
(observer.on_presence)(presence_v2.clone());
true
} else {
false
}
})
}
}
fn on_presence_v3(&self, json_str: &str) {
let mut observers_v3 = self.observers_v3.lock().unwrap();
if observers_v3.is_empty() {
return;
}
if let Ok(presence_graph) = serde_json::from_str(json_str) {
observers_v3.retain(|weak_observer| {
if let Some(observer) = weak_observer.upgrade() {
(observer.on_presence)(&presence_graph);
true
} else {
false
}
})
}
}
fn subscribe(self: &Arc<Self>) {
unsafe {
ffi_sdk::ditto_register_presence_v2_callback(
&self.ditto,
Arc::downgrade(self).into_raw() as *mut _,
None,
None,
Some(<unsafe extern "C" fn(_, char_p::Ref<'_>)>::into(
Presence::on_event_v2,
)),
);
}
unsafe {
ffi_sdk::ditto_register_presence_callback_v3(
&self.ditto,
Arc::downgrade(self).into_raw() as *mut _,
None,
None,
Some(<unsafe extern "C" fn(_, char_p::Ref<'_>)>::into(
Presence::on_event_v3,
)),
);
}
*self.registered.lock().unwrap() = true;
}
pub(crate) fn add_observer(
self: &Arc<Self>,
handler: impl Fn(V2Presence) + Send + Sync + 'static,
) -> PeersObserver {
let context = PeersObserverCtx::new(Box::new(handler));
let arc_context = Arc::new(context);
let weak_context = Arc::downgrade(&arc_context);
if !*self.registered.lock().unwrap() {
self.subscribe();
}
{
let mut observers = self.observers_v2.lock().unwrap();
observers.push(weak_context);
}
let self_1 = self.retain();
std::thread::spawn(move || {
{
let str_box = ffi_sdk::ditto_presence_v2(&self_1.ditto);
self_1.on_presence_v2(str_box.to_str())
};
});
PeersObserver::new(arc_context)
}
pub fn observe(
self: &Arc<Self>,
callback: impl Fn(&PresenceGraph) + Send + Sync + 'static,
) -> PresenceObserver {
if !*self.registered.lock().unwrap() {
self.subscribe();
}
let context = PresenceObserverCtx::new(Box::new(callback));
let arc_context = Arc::new(context);
let weak_context = Arc::downgrade(&arc_context);
{
let mut observers = self.observers_v3.lock().unwrap();
observers.push(weak_context);
}
let self_1 = self.retain();
std::thread::spawn(move || {
{
let str_box = ffi_sdk::ditto_presence_v3(&self_1.ditto);
self_1.on_presence_v3(str_box.to_str())
};
});
PresenceObserver::new(arc_context)
}
pub fn exec(&self) -> PresenceGraph {
let raw_string = ffi_sdk::ditto_presence_v3(&self.ditto);
let json_str = raw_string.to_str();
serde_json::from_str(json_str).unwrap()
}
}