Stop extensions' servers and message loops before removing their files (#34208)

Fixes an issue that caused Windows to fail when removing extension's
directories, as Zed had never stop any related processes.

Now:

* Zed shuts down and waits until the end when the language servers are
shut down

* Adds `impl Drop for WasmExtension` where does
`self.tx.close_channel();` to stop a receiver loop that holds the "lock"
on the extension's work dir.
The extension was dropped, but the channel was not closed for some
reason.

* Does more unregistration to ensure `Arc<WasmExtension>` with the `tx`
does not leak further

* Tidies up the related errors which had never reported a problematic
path before

Release Notes:

- N/A

---------

Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
Co-authored-by: Smit <smit@zed.dev>

Cargo.lock

@@ -8978,6 +8978,7 @@ dependencies = [
  "gpui",
  "language",
  "lsp",
+ "project",
  "serde",
  "serde_json",
  "util",

crates/assistant_slash_command/src/extension_slash_command.rs

@@ -34,6 +34,11 @@ impl ExtensionSlashCommandProxy for SlashCommandRegistryProxy {
         self.slash_command_registry
             .register_command(ExtensionSlashCommand::new(extension, command), false)
     }
+
+    fn unregister_slash_command(&self, command_name: Arc<str>) {
+        self.slash_command_registry
+            .unregister_command_by_name(&command_name)
+    }
 }
 
 /// An adapter that allows an [`LspAdapterDelegate`] to be used as a [`WorktreeDelegate`].

crates/eval/src/eval.rs

@@ -8,6 +8,7 @@ mod tool_metrics;
 
 use assertions::{AssertionsReport, display_error_row};
 use instance::{ExampleInstance, JudgeOutput, RunOutput, run_git};
+use language_extension::LspAccess;
 pub(crate) use tool_metrics::*;
 
 use ::fs::RealFs;
@@ -415,7 +416,11 @@ pub fn init(cx: &mut App) -> Arc<AgentAppState> {
 
     language::init(cx);
     debug_adapter_extension::init(extension_host_proxy.clone(), cx);
-    language_extension::init(extension_host_proxy.clone(), languages.clone());
+    language_extension::init(
+        LspAccess::Noop,
+        extension_host_proxy.clone(),
+        languages.clone(),
+    );
     language_model::init(client.clone(), cx);
     language_models::init(user_store.clone(), client.clone(), cx);
     languages::init(languages.clone(), node_runtime.clone(), cx);

crates/extension/src/extension_host_proxy.rs

@@ -286,7 +286,8 @@ pub trait ExtensionLanguageServerProxy: Send + Sync + 'static {
         &self,
         language: &LanguageName,
         language_server_id: &LanguageServerName,
-    );
+        cx: &mut App,
+    ) -> Task<Result<()>>;
 
     fn update_language_server_status(
         &self,
@@ -313,12 +314,13 @@ impl ExtensionLanguageServerProxy for ExtensionHostProxy {
         &self,
         language: &LanguageName,
         language_server_id: &LanguageServerName,
-    ) {
+        cx: &mut App,
+    ) -> Task<Result<()>> {
         let Some(proxy) = self.language_server_proxy.read().clone() else {
-            return;
+            return Task::ready(Ok(()));
         };
 
-        proxy.remove_language_server(language, language_server_id)
+        proxy.remove_language_server(language, language_server_id, cx)
     }
 
     fn update_language_server_status(
@@ -350,6 +352,8 @@ impl ExtensionSnippetProxy for ExtensionHostProxy {
 
 pub trait ExtensionSlashCommandProxy: Send + Sync + 'static {
     fn register_slash_command(&self, extension: Arc<dyn Extension>, command: SlashCommand);
+
+    fn unregister_slash_command(&self, command_name: Arc<str>);
 }
 
 impl ExtensionSlashCommandProxy for ExtensionHostProxy {
@@ -360,6 +364,14 @@ impl ExtensionSlashCommandProxy for ExtensionHostProxy {
 
         proxy.register_slash_command(extension, command)
     }
+
+    fn unregister_slash_command(&self, command_name: Arc<str>) {
+        let Some(proxy) = self.slash_command_proxy.read().clone() else {
+            return;
+        };
+
+        proxy.unregister_slash_command(command_name)
+    }
 }
 
 pub trait ExtensionContextServerProxy: Send + Sync + 'static {
@@ -398,6 +410,8 @@ impl ExtensionContextServerProxy for ExtensionHostProxy {
 
 pub trait ExtensionIndexedDocsProviderProxy: Send + Sync + 'static {
     fn register_indexed_docs_provider(&self, extension: Arc<dyn Extension>, provider_id: Arc<str>);
+
+    fn unregister_indexed_docs_provider(&self, provider_id: Arc<str>);
 }
 
 impl ExtensionIndexedDocsProviderProxy for ExtensionHostProxy {
@@ -408,6 +422,14 @@ impl ExtensionIndexedDocsProviderProxy for ExtensionHostProxy {
 
         proxy.register_indexed_docs_provider(extension, provider_id)
     }
+
+    fn unregister_indexed_docs_provider(&self, provider_id: Arc<str>) {
+        let Some(proxy) = self.indexed_docs_provider_proxy.read().clone() else {
+            return;
+        };
+
+        proxy.unregister_indexed_docs_provider(provider_id)
+    }
 }
 
 pub trait ExtensionDebugAdapterProviderProxy: Send + Sync + 'static {

crates/extension_host/src/extension_host.rs

@@ -20,6 +20,7 @@ use extension::{
     ExtensionSnippetProxy, ExtensionThemeProxy,
 };
 use fs::{Fs, RemoveOptions};
+use futures::future::join_all;
 use futures::{
     AsyncReadExt as _, Future, FutureExt as _, StreamExt as _,
     channel::{
@@ -860,8 +861,8 @@ impl ExtensionStore {
             btree_map::Entry::Vacant(e) => e.insert(ExtensionOperation::Remove),
         };
 
-        cx.spawn(async move |this, cx| {
-            let _finish = cx.on_drop(&this, {
+        cx.spawn(async move |extension_store, cx| {
+            let _finish = cx.on_drop(&extension_store, {
                 let extension_id = extension_id.clone();
                 move |this, cx| {
                     this.outstanding_operations.remove(extension_id.as_ref());
@@ -876,22 +877,39 @@ impl ExtensionStore {
                     ignore_if_not_exists: true,
                 },
             )
-            .await?;
+            .await
+            .with_context(|| format!("Removing extension dir {extension_dir:?}"))?;
 
-            // todo(windows)
-            // Stop the server here.
-            this.update(cx, |this, cx| this.reload(None, cx))?.await;
+            extension_store
+                .update(cx, |extension_store, cx| extension_store.reload(None, cx))?
+                .await;
 
-            fs.remove_dir(
+            // There's a race between wasm extension fully stopping and the directory removal.
+            // On Windows, it's impossible to remove a directory that has a process running in it.
+            for i in 0..3 {
+                cx.background_executor()
+                    .timer(Duration::from_millis(i * 100))
+                    .await;
+                let removal_result = fs
+                    .remove_dir(
                         &work_dir,
                         RemoveOptions {
                             recursive: true,
                             ignore_if_not_exists: true,
                         },
                     )
-            .await?;
+                    .await;
+                match removal_result {
+                    Ok(()) => break,
+                    Err(e) => {
+                        if i == 2 {
+                            log::error!("Failed to remove extension work dir {work_dir:?} : {e}");
+                        }
+                    }
+                }
+            }
 
-            this.update(cx, |_, cx| {
+            extension_store.update(cx, |_, cx| {
                 cx.emit(Event::ExtensionUninstalled(extension_id.clone()));
                 if let Some(events) = ExtensionEvents::try_global(cx) {
                     if let Some(manifest) = extension_manifest {
@@ -1143,27 +1161,38 @@ impl ExtensionStore {
             })
             .collect::<Vec<_>>();
         let mut grammars_to_remove = Vec::new();
+        let mut server_removal_tasks = Vec::with_capacity(extensions_to_unload.len());
         for extension_id in &extensions_to_unload {
             let Some(extension) = old_index.extensions.get(extension_id) else {
                 continue;
             };
             grammars_to_remove.extend(extension.manifest.grammars.keys().cloned());
-            for (language_server_name, config) in extension.manifest.language_servers.iter() {
+            for (language_server_name, config) in &extension.manifest.language_servers {
                 for language in config.languages() {
-                    self.proxy
-                        .remove_language_server(&language, language_server_name);
+                    server_removal_tasks.push(self.proxy.remove_language_server(
+                        &language,
+                        language_server_name,
+                        cx,
+                    ));
                 }
             }
 
-            for (server_id, _) in extension.manifest.context_servers.iter() {
+            for (server_id, _) in &extension.manifest.context_servers {
                 self.proxy.unregister_context_server(server_id.clone(), cx);
             }
-            for (adapter, _) in extension.manifest.debug_adapters.iter() {
+            for (adapter, _) in &extension.manifest.debug_adapters {
                 self.proxy.unregister_debug_adapter(adapter.clone());
             }
-            for (locator, _) in extension.manifest.debug_locators.iter() {
+            for (locator, _) in &extension.manifest.debug_locators {
                 self.proxy.unregister_debug_locator(locator.clone());
             }
+            for (command_name, _) in &extension.manifest.slash_commands {
+                self.proxy.unregister_slash_command(command_name.clone());
+            }
+            for (provider_id, _) in &extension.manifest.indexed_docs_providers {
+                self.proxy
+                    .unregister_indexed_docs_provider(provider_id.clone());
+            }
         }
 
         self.wasm_extensions
@@ -1268,14 +1297,15 @@ impl ExtensionStore {
             cx.background_spawn({
                 let fs = fs.clone();
                 async move {
-                    for theme_path in themes_to_add.into_iter() {
+                    let _ = join_all(server_removal_tasks).await;
+                    for theme_path in themes_to_add {
                         proxy
                             .load_user_theme(theme_path, fs.clone())
                             .await
                             .log_err();
                     }
 
-                    for (icon_theme_path, icons_root_path) in icon_themes_to_add.into_iter() {
+                    for (icon_theme_path, icons_root_path) in icon_themes_to_add {
                         proxy
                             .load_icon_theme(icon_theme_path, icons_root_path, fs.clone())
                             .await

crates/extension_host/src/extension_store_test.rs

@@ -11,6 +11,7 @@ use futures::{AsyncReadExt, StreamExt, io::BufReader};
 use gpui::{AppContext as _, SemanticVersion, TestAppContext};
 use http_client::{FakeHttpClient, Response};
 use language::{BinaryStatus, LanguageMatcher, LanguageRegistry};
+use language_extension::LspAccess;
 use lsp::LanguageServerName;
 use node_runtime::NodeRuntime;
 use parking_lot::Mutex;
@@ -271,7 +272,7 @@ async fn test_extension_store(cx: &mut TestAppContext) {
     let theme_registry = Arc::new(ThemeRegistry::new(Box::new(())));
     theme_extension::init(proxy.clone(), theme_registry.clone(), cx.executor());
     let language_registry = Arc::new(LanguageRegistry::test(cx.executor()));
-    language_extension::init(proxy.clone(), language_registry.clone());
+    language_extension::init(LspAccess::Noop, proxy.clone(), language_registry.clone());
     let node_runtime = NodeRuntime::unavailable();
 
     let store = cx.new(|cx| {
@@ -554,7 +555,11 @@ async fn test_extension_store_with_test_extension(cx: &mut TestAppContext) {
     let theme_registry = Arc::new(ThemeRegistry::new(Box::new(())));
     theme_extension::init(proxy.clone(), theme_registry.clone(), cx.executor());
     let language_registry = project.read_with(cx, |project, _cx| project.languages().clone());
-    language_extension::init(proxy.clone(), language_registry.clone());
+    language_extension::init(
+        LspAccess::ViaLspStore(project.update(cx, |project, _| project.lsp_store())),
+        proxy.clone(),
+        language_registry.clone(),
+    );
     let node_runtime = NodeRuntime::unavailable();
 
     let mut status_updates = language_registry.language_server_binary_statuses();
@@ -815,7 +820,6 @@ async fn test_extension_store_with_test_extension(cx: &mut TestAppContext) {
     extension_store
         .update(cx, |store, cx| store.reload(Some("gleam".into()), cx))
         .await;
-
     cx.executor().run_until_parked();
     project.update(cx, |project, cx| {
         project.restart_language_servers_for_buffers(vec![buffer.clone()], HashSet::default(), cx)

crates/extension_host/src/headless_host.rs

@@ -11,6 +11,7 @@ use extension::{
     ExtensionLanguageServerProxy, ExtensionManifest,
 };
 use fs::{Fs, RemoveOptions, RenameOptions};
+use futures::future::join_all;
 use gpui::{App, AppContext as _, AsyncApp, Context, Entity, Task, WeakEntity};
 use http_client::HttpClient;
 use language::{LanguageConfig, LanguageName, LanguageQueries, LoadedLanguage};
@@ -230,18 +231,27 @@ impl HeadlessExtensionStore {
             .unwrap_or_default();
         self.proxy.remove_languages(&languages_to_remove, &[]);
 
-        for (language_server_name, language) in self
+        let servers_to_remove = self
             .loaded_language_servers
             .remove(extension_id)
-            .unwrap_or_default()
-        {
-            self.proxy
-                .remove_language_server(&language, &language_server_name);
-        }
-
+            .unwrap_or_default();
+        let proxy = self.proxy.clone();
         let path = self.extension_dir.join(&extension_id.to_string());
         let fs = self.fs.clone();
-        cx.spawn(async move |_, _| {
+        cx.spawn(async move |_, cx| {
+            let mut removal_tasks = Vec::with_capacity(servers_to_remove.len());
+            cx.update(|cx| {
+                for (language_server_name, language) in servers_to_remove {
+                    removal_tasks.push(proxy.remove_language_server(
+                        &language,
+                        &language_server_name,
+                        cx,
+                    ));
+                }
+            })
+            .ok();
+            let _ = join_all(removal_tasks).await;
+
             fs.remove_dir(
                 &path,
                 RemoveOptions {
@@ -250,6 +260,7 @@ impl HeadlessExtensionStore {
                 },
             )
             .await
+            .with_context(|| format!("Removing directory {path:?}"))
         })
     }
 

crates/extension_host/src/wasm_host.rs

@@ -54,7 +54,7 @@ pub struct WasmHost {
     main_thread_message_tx: mpsc::UnboundedSender<MainThreadCall>,
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct WasmExtension {
     tx: UnboundedSender<ExtensionCall>,
     pub manifest: Arc<ExtensionManifest>,
@@ -63,6 +63,12 @@ pub struct WasmExtension {
     pub zed_api_version: SemanticVersion,
 }
 
+impl Drop for WasmExtension {
+    fn drop(&mut self) {
+        self.tx.close_channel();
+    }
+}
+
 #[async_trait]
 impl extension::Extension for WasmExtension {
     fn manifest(&self) -> Arc<ExtensionManifest> {
@@ -742,7 +748,6 @@ impl WasmExtension {
     {
         let (return_tx, return_rx) = oneshot::channel();
         self.tx
-            .clone()
             .unbounded_send(Box::new(move |extension, store| {
                 async {
                     let result = f(extension, store).await;

crates/indexed_docs/src/extension_indexed_docs_provider.rs

@@ -29,6 +29,11 @@ impl ExtensionIndexedDocsProviderProxy for IndexedDocsRegistryProxy {
                 ProviderId(provider_id),
             )));
     }
+
+    fn unregister_indexed_docs_provider(&self, provider_id: Arc<str>) {
+        self.indexed_docs_registry
+            .unregister_provider(&ProviderId(provider_id));
+    }
 }
 
 pub struct ExtensionIndexedDocsProvider {

crates/indexed_docs/src/registry.rs

@@ -52,6 +52,10 @@ impl IndexedDocsRegistry {
         );
     }
 
+    pub fn unregister_provider(&self, provider_id: &ProviderId) {
+        self.stores_by_provider.write().remove(provider_id);
+    }
+
     pub fn get_provider_store(&self, provider_id: ProviderId) -> Option<Arc<IndexedDocsStore>> {
         self.stores_by_provider.read().get(&provider_id).cloned()
     }

crates/language_extension/Cargo.toml

@@ -21,6 +21,7 @@ fs.workspace = true
 gpui.workspace = true
 language.workspace = true
 lsp.workspace = true
+project.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 util.workspace = true

crates/language_extension/src/extension_lsp_adapter.rs

@@ -6,21 +6,24 @@ use std::sync::Arc;
 
 use anyhow::{Context as _, Result};
 use async_trait::async_trait;
-use collections::HashMap;
+use collections::{HashMap, HashSet};
 use extension::{Extension, ExtensionLanguageServerProxy, WorktreeDelegate};
 use fs::Fs;
-use futures::{Future, FutureExt};
-use gpui::AsyncApp;
+use futures::{Future, FutureExt, future::join_all};
+use gpui::{App, AppContext, AsyncApp, Task};
 use language::{
     BinaryStatus, CodeLabel, HighlightId, Language, LanguageName, LanguageToolchainStore,
     LspAdapter, LspAdapterDelegate,
 };
-use lsp::{CodeActionKind, LanguageServerBinary, LanguageServerBinaryOptions, LanguageServerName};
+use lsp::{
+    CodeActionKind, LanguageServerBinary, LanguageServerBinaryOptions, LanguageServerName,
+    LanguageServerSelector,
+};
 use serde::Serialize;
 use serde_json::Value;
 use util::{ResultExt, fs::make_file_executable, maybe};
 
-use crate::LanguageServerRegistryProxy;
+use crate::{LanguageServerRegistryProxy, LspAccess};
 
 /// An adapter that allows an [`LspAdapterDelegate`] to be used as a [`WorktreeDelegate`].
 struct WorktreeDelegateAdapter(pub Arc<dyn LspAdapterDelegate>);
@@ -71,10 +74,50 @@ impl ExtensionLanguageServerProxy for LanguageServerRegistryProxy {
     fn remove_language_server(
         &self,
         language: &LanguageName,
-        language_server_id: &LanguageServerName,
-    ) {
+        language_server_name: &LanguageServerName,
+        cx: &mut App,
+    ) -> Task<Result<()>> {
         self.language_registry
-            .remove_lsp_adapter(language, language_server_id);
+            .remove_lsp_adapter(language, language_server_name);
+
+        let mut tasks = Vec::new();
+        match &self.lsp_access {
+            LspAccess::ViaLspStore(lsp_store) => lsp_store.update(cx, |lsp_store, cx| {
+                let stop_task = lsp_store.stop_language_servers_for_buffers(
+                    Vec::new(),
+                    HashSet::from_iter([LanguageServerSelector::Name(
+                        language_server_name.clone(),
+                    )]),
+                    cx,
+                );
+                tasks.push(stop_task);
+            }),
+            LspAccess::ViaWorkspaces(lsp_store_provider) => {
+                if let Ok(lsp_stores) = lsp_store_provider(cx) {
+                    for lsp_store in lsp_stores {
+                        lsp_store.update(cx, |lsp_store, cx| {
+                            let stop_task = lsp_store.stop_language_servers_for_buffers(
+                                Vec::new(),
+                                HashSet::from_iter([LanguageServerSelector::Name(
+                                    language_server_name.clone(),
+                                )]),
+                                cx,
+                            );
+                            tasks.push(stop_task);
+                        });
+                    }
+                }
+            }
+            LspAccess::Noop => {}
+        }
+
+        cx.background_spawn(async move {
+            let results = join_all(tasks).await;
+            for result in results {
+                result?;
+            }
+            Ok(())
+        })
     }
 
     fn update_language_server_status(

crates/language_extension/src/language_extension.rs

@@ -5,13 +5,26 @@ use std::sync::Arc;
 
 use anyhow::Result;
 use extension::{ExtensionGrammarProxy, ExtensionHostProxy, ExtensionLanguageProxy};
+use gpui::{App, Entity};
 use language::{LanguageMatcher, LanguageName, LanguageRegistry, LoadedLanguage};
+use project::LspStore;
+
+#[derive(Clone)]
+pub enum LspAccess {
+    ViaLspStore(Entity<LspStore>),
+    ViaWorkspaces(Arc<dyn Fn(&mut App) -> Result<Vec<Entity<LspStore>>> + Send + Sync + 'static>),
+    Noop,
+}
 
 pub fn init(
+    lsp_access: LspAccess,
     extension_host_proxy: Arc<ExtensionHostProxy>,
     language_registry: Arc<LanguageRegistry>,
 ) {
-    let language_server_registry_proxy = LanguageServerRegistryProxy { language_registry };
+    let language_server_registry_proxy = LanguageServerRegistryProxy {
+        language_registry,
+        lsp_access,
+    };
     extension_host_proxy.register_grammar_proxy(language_server_registry_proxy.clone());
     extension_host_proxy.register_language_proxy(language_server_registry_proxy.clone());
     extension_host_proxy.register_language_server_proxy(language_server_registry_proxy);
@@ -20,6 +33,7 @@ pub fn init(
 #[derive(Clone)]
 struct LanguageServerRegistryProxy {
     language_registry: Arc<LanguageRegistry>,
+    lsp_access: LspAccess,
 }
 
 impl ExtensionGrammarProxy for LanguageServerRegistryProxy {

crates/project/src/lsp_store.rs

@@ -9712,7 +9712,8 @@ impl LspStore {
             } else {
                 let buffers =
                     lsp_store.buffer_ids_to_buffers(envelope.payload.buffer_ids.into_iter(), cx);
-                lsp_store.stop_language_servers_for_buffers(
+                lsp_store
+                    .stop_language_servers_for_buffers(
                         buffers,
                         envelope
                             .payload
@@ -9720,11 +9721,11 @@ impl LspStore {
                             .into_iter()
                             .filter_map(|selector| {
                                 Some(match selector.selector? {
-                                proto::language_server_selector::Selector::ServerId(server_id) => {
-                                    LanguageServerSelector::Id(LanguageServerId::from_proto(
+                                    proto::language_server_selector::Selector::ServerId(
                                         server_id,
-                                    ))
-                                }
+                                    ) => LanguageServerSelector::Id(LanguageServerId::from_proto(
+                                        server_id,
+                                    )),
                                     proto::language_server_selector::Selector::Name(name) => {
                                         LanguageServerSelector::Name(LanguageServerName(
                                             SharedString::from(name),
@@ -9734,7 +9735,8 @@ impl LspStore {
                             })
                             .collect(),
                         cx,
-                );
+                    )
+                    .detach_and_log_err(cx);
             }
         })?;
 
@@ -10290,9 +10292,9 @@ impl LspStore {
     pub fn stop_language_servers_for_buffers(
         &mut self,
         buffers: Vec<Entity<Buffer>>,
-        also_restart_servers: HashSet<LanguageServerSelector>,
+        also_stop_servers: HashSet<LanguageServerSelector>,
         cx: &mut Context<Self>,
-    ) {
+    ) -> Task<Result<()>> {
         if let Some((client, project_id)) = self.upstream_client() {
             let request = client.request(proto::StopLanguageServers {
                 project_id,
@@ -10300,7 +10302,7 @@ impl LspStore {
                     .into_iter()
                     .map(|b| b.read(cx).remote_id().to_proto())
                     .collect(),
-                also_servers: also_restart_servers
+                also_servers: also_stop_servers
                     .into_iter()
                     .map(|selector| {
                         let selector = match selector {
@@ -10322,24 +10324,31 @@ impl LspStore {
                     .collect(),
                 all: false,
             });
-            cx.background_spawn(request).detach_and_log_err(cx);
+            cx.background_spawn(async move {
+                let _ = request.await?;
+                Ok(())
+            })
         } else {
-            self.stop_local_language_servers_for_buffers(&buffers, also_restart_servers, cx)
-                .detach();
+            let task =
+                self.stop_local_language_servers_for_buffers(&buffers, also_stop_servers, cx);
+            cx.background_spawn(async move {
+                task.await;
+                Ok(())
+            })
         }
     }
 
     fn stop_local_language_servers_for_buffers(
         &mut self,
         buffers: &[Entity<Buffer>],
-        also_restart_servers: HashSet<LanguageServerSelector>,
+        also_stop_servers: HashSet<LanguageServerSelector>,
         cx: &mut Context<Self>,
     ) -> Task<()> {
         let Some(local) = self.as_local_mut() else {
             return Task::ready(());
         };
         let mut language_server_names_to_stop = BTreeSet::default();
-        let mut language_servers_to_stop = also_restart_servers
+        let mut language_servers_to_stop = also_stop_servers
             .into_iter()
             .flat_map(|selector| match selector {
                 LanguageServerSelector::Id(id) => Some(id),

crates/project/src/project.rs

@@ -3217,9 +3217,11 @@ impl Project {
         also_restart_servers: HashSet<LanguageServerSelector>,
         cx: &mut Context<Self>,
     ) {
-        self.lsp_store.update(cx, |lsp_store, cx| {
+        self.lsp_store
+            .update(cx, |lsp_store, cx| {
                 lsp_store.stop_language_servers_for_buffers(buffers, also_restart_servers, cx)
             })
+            .detach_and_log_err(cx);
     }
 
     pub fn cancel_language_server_work_for_buffers(

crates/remote_server/src/headless_project.rs

@@ -77,7 +77,6 @@ impl HeadlessProject {
         cx: &mut Context<Self>,
     ) -> Self {
         debug_adapter_extension::init(proxy.clone(), cx);
-        language_extension::init(proxy.clone(), languages.clone());
         languages::init(languages.clone(), node_runtime.clone(), cx);
 
         let worktree_store = cx.new(|cx| {
@@ -185,6 +184,11 @@ impl HeadlessProject {
         });
 
         cx.subscribe(&lsp_store, Self::on_lsp_store_event).detach();
+        language_extension::init(
+            language_extension::LspAccess::ViaLspStore(lsp_store.clone()),
+            proxy.clone(),
+            languages.clone(),
+        );
 
         cx.subscribe(
             &buffer_store,

crates/workspace/src/workspace.rs

@@ -6657,6 +6657,10 @@ impl WorkspaceStore {
             Ok(())
         })?
     }
+
+    pub fn workspaces(&self) -> &HashSet<WindowHandle<Workspace>> {
+        &self.workspaces
+    }
 }
 
 impl ViewId {

crates/zed/src/main.rs

@@ -441,11 +441,31 @@ pub fn main() {
 
         debug_adapter_extension::init(extension_host_proxy.clone(), cx);
         language::init(cx);
-        language_extension::init(extension_host_proxy.clone(), languages.clone());
         languages::init(languages.clone(), node_runtime.clone(), cx);
         let user_store = cx.new(|cx| UserStore::new(client.clone(), cx));
         let workspace_store = cx.new(|cx| WorkspaceStore::new(client.clone(), cx));
 
+        language_extension::init(
+            language_extension::LspAccess::ViaWorkspaces({
+                let workspace_store = workspace_store.clone();
+                Arc::new(move |cx: &mut App| {
+                    workspace_store.update(cx, |workspace_store, cx| {
+                        workspace_store
+                            .workspaces()
+                            .iter()
+                            .map(|workspace| {
+                                workspace.update(cx, |workspace, _, cx| {
+                                    workspace.project().read(cx).lsp_store()
+                                })
+                            })
+                            .collect()
+                    })
+                })
+            }),
+            extension_host_proxy.clone(),
+            languages.clone(),
+        );
+
         Client::set_global(client.clone(), cx);
 
         zed::init(cx);