1use std::time::Duration;
  2
  3use db::kvp::KEY_VALUE_STORE;
  4use gpui::{App, AppContext as _, Context, Subscription, Task, WindowId};
  5use util::ResultExt;
  6use uuid::Uuid;
  7
  8pub struct Session {
  9    session_id: String,
 10    old_session_id: Option<String>,
 11    old_window_ids: Option<Vec<WindowId>>,
 12}
 13
 14const SESSION_ID_KEY: &str = "session_id";
 15const SESSION_WINDOW_STACK_KEY: &str = "session_window_stack";
 16
 17impl Session {
 18    pub async fn new() -> Self {
 19        let old_session_id = KEY_VALUE_STORE.read_kvp(SESSION_ID_KEY).ok().flatten();
 20
 21        let session_id = Uuid::new_v4().to_string();
 22
 23        KEY_VALUE_STORE
 24            .write_kvp(SESSION_ID_KEY.to_string(), session_id.clone())
 25            .await
 26            .log_err();
 27
 28        let old_window_ids = KEY_VALUE_STORE
 29            .read_kvp(SESSION_WINDOW_STACK_KEY)
 30            .ok()
 31            .flatten()
 32            .and_then(|json| serde_json::from_str::<Vec<u64>>(&json).ok())
 33            .map(|vec| {
 34                vec.into_iter()
 35                    .map(WindowId::from)
 36                    .collect::<Vec<WindowId>>()
 37            });
 38
 39        Self {
 40            session_id,
 41            old_session_id,
 42            old_window_ids,
 43        }
 44    }
 45
 46    #[cfg(any(test, feature = "test-support"))]
 47    pub fn test() -> Self {
 48        Self {
 49            session_id: Uuid::new_v4().to_string(),
 50            old_session_id: None,
 51            old_window_ids: None,
 52        }
 53    }
 54
 55    pub fn id(&self) -> &str {
 56        &self.session_id
 57    }
 58}
 59
 60pub struct AppSession {
 61    session: Session,
 62    _serialization_task: Task<()>,
 63    _subscriptions: Vec<Subscription>,
 64}
 65
 66impl AppSession {
 67    pub fn new(session: Session, cx: &Context<Self>) -> Self {
 68        let _subscriptions = vec![cx.on_app_quit(Self::app_will_quit)];
 69
 70        let _serialization_task = cx.spawn(async move |_, cx| {
 71            let mut current_window_stack = Vec::new();
 72            loop {
 73                if let Some(windows) = cx.update(|cx| window_stack(cx)).ok().flatten()
 74                    && windows != current_window_stack {
 75                        store_window_stack(&windows).await;
 76                        current_window_stack = windows;
 77                    }
 78
 79                cx.background_executor()
 80                    .timer(Duration::from_millis(500))
 81                    .await;
 82            }
 83        });
 84
 85        Self {
 86            session,
 87            _subscriptions,
 88            _serialization_task,
 89        }
 90    }
 91
 92    fn app_will_quit(&mut self, cx: &mut Context<Self>) -> Task<()> {
 93        if let Some(window_stack) = window_stack(cx) {
 94            cx.background_spawn(async move { store_window_stack(&window_stack).await })
 95        } else {
 96            Task::ready(())
 97        }
 98    }
 99
100    pub fn id(&self) -> &str {
101        self.session.id()
102    }
103
104    pub fn last_session_id(&self) -> Option<&str> {
105        self.session.old_session_id.as_deref()
106    }
107
108    pub fn last_session_window_stack(&self) -> Option<Vec<WindowId>> {
109        self.session.old_window_ids.clone()
110    }
111}
112
113fn window_stack(cx: &App) -> Option<Vec<u64>> {
114    Some(
115        cx.window_stack()?
116            .into_iter()
117            .map(|window| window.window_id().as_u64())
118            .collect(),
119    )
120}
121
122async fn store_window_stack(windows: &[u64]) {
123    if let Ok(window_ids_json) = serde_json::to_string(windows) {
124        KEY_VALUE_STORE
125            .write_kvp(SESSION_WINDOW_STACK_KEY.to_string(), window_ids_json)
126            .await
127            .log_err();
128    }
129}