402 lines
14 KiB
Rust
402 lines
14 KiB
Rust
use anyhow::{anyhow, Context, Result};
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use async_tungstenite::tungstenite::http::Request;
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use async_tungstenite::tungstenite::{Error as WebSocketError, Message as WebSocketMessage};
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use gpui::{AsyncAppContext, Entity, ModelContext, Task};
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use lazy_static::lazy_static;
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use parking_lot::RwLock;
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use postage::prelude::Stream;
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use postage::sink::Sink;
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use postage::watch;
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use std::any::TypeId;
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use std::collections::HashMap;
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use std::sync::Weak;
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use std::time::{Duration, Instant};
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use std::{convert::TryFrom, future::Future, sync::Arc};
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use surf::Url;
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use zrpc::proto::{AnyTypedEnvelope, EntityMessage};
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pub use zrpc::{proto, ConnectionId, PeerId, TypedEnvelope};
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use zrpc::{
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proto::{EnvelopedMessage, RequestMessage},
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Peer, Receipt,
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};
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lazy_static! {
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static ref ZED_SERVER_URL: String =
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std::env::var("ZED_SERVER_URL").unwrap_or("https://zed.dev:443".to_string());
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}
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pub struct Client {
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peer: Arc<Peer>,
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state: RwLock<ClientState>,
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}
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struct ClientState {
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connection_id: Option<ConnectionId>,
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user_id: (watch::Sender<Option<u64>>, watch::Receiver<Option<u64>>),
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entity_id_extractors: HashMap<TypeId, Box<dyn Send + Sync + Fn(&dyn AnyTypedEnvelope) -> u64>>,
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model_handlers: HashMap<
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(TypeId, u64),
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Box<dyn Send + Sync + FnMut(Box<dyn AnyTypedEnvelope>, &mut AsyncAppContext)>,
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>,
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}
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impl Default for ClientState {
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fn default() -> Self {
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Self {
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connection_id: Default::default(),
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user_id: watch::channel(),
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entity_id_extractors: Default::default(),
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model_handlers: Default::default(),
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}
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}
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}
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pub struct Subscription {
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client: Weak<Client>,
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id: (TypeId, u64),
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}
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impl Drop for Subscription {
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fn drop(&mut self) {
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if let Some(client) = self.client.upgrade() {
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drop(
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client
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.state
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.write()
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.model_handlers
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.remove(&self.id)
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.unwrap(),
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);
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}
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}
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}
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impl Client {
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pub fn new() -> Arc<Self> {
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Arc::new(Self {
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peer: Peer::new(),
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state: Default::default(),
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})
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}
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pub fn user_id(&self) -> watch::Receiver<Option<u64>> {
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self.state.read().user_id.1.clone()
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}
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pub fn subscribe_from_model<T, M, F>(
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self: &Arc<Self>,
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remote_id: u64,
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cx: &mut ModelContext<M>,
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mut handler: F,
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) -> Subscription
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where
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T: EntityMessage,
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M: Entity,
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F: 'static
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+ Send
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+ Sync
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+ FnMut(&mut M, TypedEnvelope<T>, Arc<Self>, &mut ModelContext<M>) -> Result<()>,
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{
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let subscription_id = (TypeId::of::<T>(), remote_id);
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let client = self.clone();
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let mut state = self.state.write();
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let model = cx.handle().downgrade();
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state
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.entity_id_extractors
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.entry(subscription_id.0)
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.or_insert_with(|| {
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Box::new(|envelope| {
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let envelope = envelope
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.as_any()
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.downcast_ref::<TypedEnvelope<T>>()
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.unwrap();
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envelope.payload.remote_entity_id()
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})
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});
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let prev_handler = state.model_handlers.insert(
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subscription_id,
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Box::new(move |envelope, cx| {
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if let Some(model) = model.upgrade(cx) {
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let envelope = envelope.into_any().downcast::<TypedEnvelope<T>>().unwrap();
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model.update(cx, |model, cx| {
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if let Err(error) = handler(model, *envelope, client.clone(), cx) {
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log::error!("error handling message: {}", error)
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}
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});
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}
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}),
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);
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if prev_handler.is_some() {
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panic!("registered a handler for the same entity twice")
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}
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Subscription {
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client: Arc::downgrade(self),
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id: subscription_id,
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}
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}
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pub async fn authenticate_and_connect(
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self: &Arc<Self>,
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cx: AsyncAppContext,
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) -> anyhow::Result<()> {
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if self.state.read().connection_id.is_some() {
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return Ok(());
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}
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let (user_id, access_token) = Self::login(cx.platform(), &cx.background()).await?;
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let user_id = user_id.parse::<u64>()?;
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let request =
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Request::builder().header("Authorization", format!("{} {}", user_id, access_token));
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if let Some(host) = ZED_SERVER_URL.strip_prefix("https://") {
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let stream = smol::net::TcpStream::connect(host).await?;
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let request = request.uri(format!("wss://{}/rpc", host)).body(())?;
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let (stream, _) = async_tungstenite::async_tls::client_async_tls(request, stream)
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.await
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.context("websocket handshake")?;
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self.add_connection(user_id, stream, cx).await?;
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} else if let Some(host) = ZED_SERVER_URL.strip_prefix("http://") {
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let stream = smol::net::TcpStream::connect(host).await?;
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let request = request.uri(format!("ws://{}/rpc", host)).body(())?;
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let (stream, _) = async_tungstenite::client_async(request, stream)
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.await
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.context("websocket handshake")?;
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self.add_connection(user_id, stream, cx).await?;
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} else {
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return Err(anyhow!("invalid server url: {}", *ZED_SERVER_URL))?;
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};
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log::info!("connected to rpc address {}", *ZED_SERVER_URL);
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Ok(())
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}
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pub async fn add_connection<Conn>(
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self: &Arc<Self>,
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user_id: u64,
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conn: Conn,
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cx: AsyncAppContext,
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) -> anyhow::Result<()>
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where
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Conn: 'static
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+ futures::Sink<WebSocketMessage, Error = WebSocketError>
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+ futures::Stream<Item = Result<WebSocketMessage, WebSocketError>>
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+ Unpin
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+ Send,
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{
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let (connection_id, handle_io, mut incoming) = self.peer.add_connection(conn).await;
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{
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let mut cx = cx.clone();
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let this = self.clone();
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cx.foreground()
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.spawn(async move {
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while let Some(message) = incoming.recv().await {
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let mut state = this.state.write();
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if let Some(extract_entity_id) =
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state.entity_id_extractors.get(&message.payload_type_id())
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{
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let entity_id = (extract_entity_id)(message.as_ref());
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if let Some(handler) = state
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.model_handlers
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.get_mut(&(message.payload_type_id(), entity_id))
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{
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let start_time = Instant::now();
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log::info!("RPC client message {}", message.payload_type_name());
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(handler)(message, &mut cx);
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log::info!(
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"RPC message handled. duration:{:?}",
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start_time.elapsed()
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);
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} else {
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log::info!("unhandled message {}", message.payload_type_name());
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}
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} else {
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log::info!("unhandled message {}", message.payload_type_name());
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}
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}
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})
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.detach();
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}
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cx.background()
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.spawn(async move {
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if let Err(error) = handle_io.await {
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log::error!("connection error: {:?}", error);
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}
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})
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.detach();
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let mut state = self.state.write();
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state.connection_id = Some(connection_id);
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state.user_id.0.send(Some(user_id)).await?;
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Ok(())
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}
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pub fn login(
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platform: Arc<dyn gpui::Platform>,
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executor: &Arc<gpui::executor::Background>,
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) -> Task<Result<(String, String)>> {
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let executor = executor.clone();
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executor.clone().spawn(async move {
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if let Some((user_id, access_token)) = platform.read_credentials(&ZED_SERVER_URL) {
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log::info!("already signed in. user_id: {}", user_id);
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return Ok((user_id, String::from_utf8(access_token).unwrap()));
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}
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// Generate a pair of asymmetric encryption keys. The public key will be used by the
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// zed server to encrypt the user's access token, so that it can'be intercepted by
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// any other app running on the user's device.
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let (public_key, private_key) =
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zrpc::auth::keypair().expect("failed to generate keypair for auth");
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let public_key_string =
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String::try_from(public_key).expect("failed to serialize public key for auth");
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// Start an HTTP server to receive the redirect from Zed's sign-in page.
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let server = tiny_http::Server::http("127.0.0.1:0").expect("failed to find open port");
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let port = server.server_addr().port();
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// Open the Zed sign-in page in the user's browser, with query parameters that indicate
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// that the user is signing in from a Zed app running on the same device.
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platform.open_url(&format!(
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"{}/sign_in?native_app_port={}&native_app_public_key={}",
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*ZED_SERVER_URL, port, public_key_string
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));
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// Receive the HTTP request from the user's browser. Retrieve the user id and encrypted
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// access token from the query params.
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//
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// TODO - Avoid ever starting more than one HTTP server. Maybe switch to using a
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// custom URL scheme instead of this local HTTP server.
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let (user_id, access_token) = executor
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.spawn(async move {
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if let Some(req) = server.recv_timeout(Duration::from_secs(10 * 60))? {
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let path = req.url();
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let mut user_id = None;
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let mut access_token = None;
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let url = Url::parse(&format!("http://example.com{}", path))
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.context("failed to parse login notification url")?;
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for (key, value) in url.query_pairs() {
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if key == "access_token" {
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access_token = Some(value.to_string());
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} else if key == "user_id" {
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user_id = Some(value.to_string());
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}
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}
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req.respond(
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tiny_http::Response::from_string(LOGIN_RESPONSE).with_header(
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tiny_http::Header::from_bytes("Content-Type", "text/html").unwrap(),
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),
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)
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.context("failed to respond to login http request")?;
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Ok((
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user_id.ok_or_else(|| anyhow!("missing user_id parameter"))?,
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access_token
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.ok_or_else(|| anyhow!("missing access_token parameter"))?,
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))
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} else {
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Err(anyhow!("didn't receive login redirect"))
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}
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})
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.await?;
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let access_token = private_key
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.decrypt_string(&access_token)
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.context("failed to decrypt access token")?;
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platform.activate(true);
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platform.write_credentials(&ZED_SERVER_URL, &user_id, access_token.as_bytes());
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Ok((user_id.to_string(), access_token))
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})
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}
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pub async fn disconnect(&self) -> Result<()> {
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let conn_id = self.connection_id()?;
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self.peer.disconnect(conn_id).await;
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Ok(())
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}
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fn connection_id(&self) -> Result<ConnectionId> {
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self.state
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.read()
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.connection_id
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.ok_or_else(|| anyhow!("not connected"))
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}
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pub async fn send<T: EnvelopedMessage>(&self, message: T) -> Result<()> {
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self.peer.send(self.connection_id()?, message).await
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}
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pub async fn request<T: RequestMessage>(&self, request: T) -> Result<T::Response> {
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self.peer.request(self.connection_id()?, request).await
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}
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pub fn respond<T: RequestMessage>(
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&self,
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receipt: Receipt<T>,
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response: T::Response,
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) -> impl Future<Output = Result<()>> {
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self.peer.respond(receipt, response)
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}
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}
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pub trait MessageHandler<'a, M: proto::EnvelopedMessage>: Clone {
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type Output: 'a + Future<Output = anyhow::Result<()>>;
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fn handle(
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&self,
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message: TypedEnvelope<M>,
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rpc: &'a Client,
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cx: &'a mut gpui::AsyncAppContext,
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) -> Self::Output;
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}
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impl<'a, M, F, Fut> MessageHandler<'a, M> for F
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where
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M: proto::EnvelopedMessage,
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F: Clone + Fn(TypedEnvelope<M>, &'a Client, &'a mut gpui::AsyncAppContext) -> Fut,
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Fut: 'a + Future<Output = anyhow::Result<()>>,
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{
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type Output = Fut;
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fn handle(
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&self,
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message: TypedEnvelope<M>,
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rpc: &'a Client,
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cx: &'a mut gpui::AsyncAppContext,
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) -> Self::Output {
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(self)(message, rpc, cx)
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}
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}
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const WORKTREE_URL_PREFIX: &'static str = "zed://worktrees/";
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pub fn encode_worktree_url(id: u64, access_token: &str) -> String {
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format!("{}{}/{}", WORKTREE_URL_PREFIX, id, access_token)
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}
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pub fn decode_worktree_url(url: &str) -> Option<(u64, String)> {
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let path = url.trim().strip_prefix(WORKTREE_URL_PREFIX)?;
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let mut parts = path.split('/');
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let id = parts.next()?.parse::<u64>().ok()?;
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let access_token = parts.next()?;
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if access_token.is_empty() {
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return None;
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}
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Some((id, access_token.to_string()))
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}
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const LOGIN_RESPONSE: &'static str = "
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<!DOCTYPE html>
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<html>
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<script>window.close();</script>
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</html>
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";
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#[test]
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fn test_encode_and_decode_worktree_url() {
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let url = encode_worktree_url(5, "deadbeef");
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assert_eq!(decode_worktree_url(&url), Some((5, "deadbeef".to_string())));
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assert_eq!(
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decode_worktree_url(&format!("\n {}\t", url)),
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Some((5, "deadbeef".to_string()))
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);
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assert_eq!(decode_worktree_url("not://the-right-format"), None);
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}
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