use crate::{Client, Connection, Credentials, EstablishConnectionError, UserStore};use anyhow::{Context as _, Result, anyhow};use chrono::Duration;use futures::{StreamExt, stream::BoxStream};use gpui::{AppContext as _, BackgroundExecutor, Entity, TestAppContext};use parking_lot::Mutex;use rpc::{    ConnectionId, Peer, Receipt, TypedEnvelope,    proto::{self, GetPrivateUserInfo, GetPrivateUserInfoResponse},};use std::sync::Arc; pub struct FakeServer {    peer: Arc<Peer>,    state: Arc<Mutex<FakeServerState>>,    user_id: u64,    executor: BackgroundExecutor,} #[derive(Default)]struct FakeServerState {    incoming: Option<BoxStream<'static, Box<dyn proto::AnyTypedEnvelope>>>,    connection_id: Option<ConnectionId>,    forbid_connections: bool,    auth_count: usize,    access_token: usize,} impl FakeServer {    pub async fn for_client(        client_user_id: u64,        client: &Arc<Client>,        cx: &TestAppContext,    ) -> Self {        let server = Self {            peer: Peer::new(0),            state: Default::default(),            user_id: client_user_id,            executor: cx.executor(),        };         client            .override_authenticate({                let state = Arc::downgrade(&server.state);                move |cx| {                    let state = state.clone();                    cx.spawn(async move |_| {                        let state = state.upgrade().context("server dropped")?;                        let mut state = state.lock();                        state.auth_count += 1;                        let access_token = state.access_token.to_string();                        Ok(Credentials {                            user_id: client_user_id,                            access_token,                        })                    })                }            })            .override_establish_connection({                let peer = Arc::downgrade(&server.peer);                let state = Arc::downgrade(&server.state);                move |credentials, cx| {                    let peer = peer.clone();                    let state = state.clone();                    let credentials = credentials.clone();                    cx.spawn(async move |cx| {                        let state = state.upgrade().context("server dropped")?;                        let peer = peer.upgrade().context("server dropped")?;                        if state.lock().forbid_connections {                            Err(EstablishConnectionError::Other(anyhow!(                                "server is forbidding connections"                            )))?                        }                         if credentials                            != (Credentials {                                user_id: client_user_id,                                access_token: state.lock().access_token.to_string(),                            })                        {                            Err(EstablishConnectionError::Unauthorized)?                        }                         let (client_conn, server_conn, _) =                            Connection::in_memory(cx.background_executor().clone());                        let (connection_id, io, incoming) =                            peer.add_test_connection(server_conn, cx.background_executor().clone());                        cx.background_spawn(io).detach();                        {                            let mut state = state.lock();                            state.connection_id = Some(connection_id);                            state.incoming = Some(incoming);                        }                        peer.send(                            connection_id,                            proto::Hello {                                peer_id: Some(connection_id.into()),                            },                        )                        .unwrap();                         Ok(client_conn)                    })                }            });         client            .authenticate_and_connect(false, &cx.to_async())            .await            .into_response()            .unwrap();         server    }     pub fn disconnect(&self) {        if self.state.lock().connection_id.is_some() {            self.peer.disconnect(self.connection_id());            let mut state = self.state.lock();            state.connection_id.take();            state.incoming.take();        }    }     pub fn auth_count(&self) -> usize {        self.state.lock().auth_count    }     pub fn roll_access_token(&self) {        self.state.lock().access_token += 1;    }     pub fn forbid_connections(&self) {        self.state.lock().forbid_connections = true;    }     pub fn allow_connections(&self) {        self.state.lock().forbid_connections = false;    }     pub fn send<T: proto::EnvelopedMessage>(&self, message: T) {        self.peer.send(self.connection_id(), message).unwrap();    }     #[allow(clippy::await_holding_lock)]    pub async fn receive<M: proto::EnvelopedMessage>(&self) -> Result<TypedEnvelope<M>> {        self.executor.start_waiting();         loop {            let message = self                .state                .lock()                .incoming                .as_mut()                .expect("not connected")                .next()                .await                .context("other half hung up")?;            self.executor.finish_waiting();            let type_name = message.payload_type_name();            let message = message.into_any();             if message.is::<TypedEnvelope<M>>() {                return Ok(*message.downcast().unwrap());            }             let accepted_tos_at = chrono::Utc::now()                .checked_sub_signed(Duration::hours(5))                .expect("failed to build accepted_tos_at")                .timestamp() as u64;             if message.is::<TypedEnvelope<GetPrivateUserInfo>>() {                self.respond(                    message                        .downcast::<TypedEnvelope<GetPrivateUserInfo>>()                        .unwrap()                        .receipt(),                    GetPrivateUserInfoResponse {                        metrics_id: "the-metrics-id".into(),                        staff: false,                        flags: Default::default(),                        accepted_tos_at: Some(accepted_tos_at),                    },                );                continue;            }             panic!(                "fake server received unexpected message type: {:?}",                type_name            );        }    }     pub fn respond<T: proto::RequestMessage>(&self, receipt: Receipt<T>, response: T::Response) {        self.peer.respond(receipt, response).unwrap()    }     fn connection_id(&self) -> ConnectionId {        self.state.lock().connection_id.expect("not connected")    }     pub async fn build_user_store(        &self,        client: Arc<Client>,        cx: &mut TestAppContext,    ) -> Entity<UserStore> {        let user_store = cx.new(|cx| UserStore::new(client, cx));        assert_eq!(            self.receive::<proto::GetUsers>()                .await                .unwrap()                .payload                .user_ids,            &[self.user_id]        );        user_store    }} impl Drop for FakeServer {    fn drop(&mut self) {        self.disconnect();    }}