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|
use std::{collections::HashMap, path::PathBuf, sync::Weak};
use globset::{GlobBuilder, GlobSetBuilder};
use tokio::sync::mpsc;
use crate::{lsp, Client};
enum Event {
FileChanged {
path: PathBuf,
},
Register {
client_id: usize,
client: Weak<Client>,
registration_id: String,
options: lsp::DidChangeWatchedFilesRegistrationOptions,
},
Unregister {
client_id: usize,
registration_id: String,
},
RemoveClient {
client_id: usize,
},
}
#[derive(Default)]
struct ClientState {
client: Weak<Client>,
registered: HashMap<String, globset::GlobSet>,
}
/// The Handler uses a dedicated tokio task to respond to file change events by
/// forwarding changes to LSPs that have registered for notifications with a
/// matching glob.
///
/// When an LSP registers for the DidChangeWatchedFiles notification, the
/// Handler is notified by sending the registration details in addition to a
/// weak reference to the LSP client. This is done so that the Handler can have
/// access to the client without preventing the client from being dropped if it
/// is closed and the Handler isn't properly notified.
#[derive(Clone, Debug)]
pub struct Handler {
tx: mpsc::UnboundedSender<Event>,
}
impl Default for Handler {
fn default() -> Self {
Self::new()
}
}
impl Handler {
pub fn new() -> Self {
let (tx, rx) = mpsc::unbounded_channel();
tokio::spawn(Self::run(rx));
Self { tx }
}
pub fn register(
&self,
client_id: usize,
client: Weak<Client>,
registration_id: String,
options: lsp::DidChangeWatchedFilesRegistrationOptions,
) {
let _ = self.tx.send(Event::Register {
client_id,
client,
registration_id,
options,
});
}
pub fn unregister(&self, client_id: usize, registration_id: String) {
let _ = self.tx.send(Event::Unregister {
client_id,
registration_id,
});
}
pub fn file_changed(&self, path: PathBuf) {
let _ = self.tx.send(Event::FileChanged { path });
}
pub fn remove_client(&self, client_id: usize) {
let _ = self.tx.send(Event::RemoveClient { client_id });
}
async fn run(mut rx: mpsc::UnboundedReceiver<Event>) {
let mut state: HashMap<usize, ClientState> = HashMap::new();
while let Some(event) = rx.recv().await {
match event {
Event::FileChanged { path } => {
log::debug!("Received file event for {:?}", &path);
state.retain(|id, client_state| {
if !client_state
.registered
.values()
.any(|glob| glob.is_match(&path))
{
return true;
}
let Some(client) = client_state.client.upgrade() else {
log::warn!("LSP client was dropped: {id}");
return false;
};
let Ok(uri) = lsp::Url::from_file_path(&path) else {
return true;
};
log::debug!(
"Sending didChangeWatchedFiles notification to client '{}'",
client.name()
);
if let Err(err) = crate::block_on(client
.did_change_watched_files(vec![lsp::FileEvent {
uri,
// We currently always send the CHANGED state
// since we don't actually have more context at
// the moment.
typ: lsp::FileChangeType::CHANGED,
}]))
{
log::warn!("Failed to send didChangeWatchedFiles notification to client: {err}");
}
true
});
}
Event::Register {
client_id,
client,
registration_id,
options: ops,
} => {
log::debug!(
"Registering didChangeWatchedFiles for client '{}' with id '{}'",
client_id,
registration_id
);
let mut entry = state.entry(client_id).or_insert_with(ClientState::default);
entry.client = client;
let mut builder = GlobSetBuilder::new();
for watcher in ops.watchers {
if let lsp::GlobPattern::String(pattern) = watcher.glob_pattern {
if let Ok(glob) = GlobBuilder::new(&pattern).build() {
builder.add(glob);
}
}
}
match builder.build() {
Ok(globset) => {
entry.registered.insert(registration_id, globset);
}
Err(err) => {
// Remove any old state for that registration id and
// remove the entire client if it's now empty.
entry.registered.remove(®istration_id);
if entry.registered.is_empty() {
state.remove(&client_id);
}
log::warn!(
"Unable to build globset for LSP didChangeWatchedFiles {err}"
)
}
}
}
Event::Unregister {
client_id,
registration_id,
} => {
log::debug!(
"Unregistering didChangeWatchedFiles with id '{}' for client '{}'",
registration_id,
client_id
);
if let Some(client_state) = state.get_mut(&client_id) {
client_state.registered.remove(®istration_id);
if client_state.registered.is_empty() {
state.remove(&client_id);
}
}
}
Event::RemoveClient { client_id } => {
log::debug!("Removing LSP client: {client_id}");
state.remove(&client_id);
}
}
}
}
}
|
