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Cancelable Initialization

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This commit provides additional initialization methods to Connection in
order to support CTRL + C sigterm handling.
This commit is contained in:
Marc Schreiber 2023-11-14 21:37:40 +01:00
parent 45136511a5
commit 81c2d3552e
3 changed files with 188 additions and 14 deletions
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32
Cargo.lock generated
View file

@ -216,7 +216,7 @@ version = "2.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5080df6b0f0ecb76cab30808f00d937ba725cebe266a3da8cd89dff92f2a9916"
dependencies = [
"nix",
"nix 0.26.2",
"winapi",
]
@ -289,6 +289,16 @@ dependencies = [
"cfg-if",
]
[[package]]
name = "ctrlc"
version = "3.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "82e95fbd621905b854affdc67943b043a0fbb6ed7385fd5a25650d19a8a6cfdf"
dependencies = [
"nix 0.27.1",
"windows-sys 0.48.0",
]
[[package]]
name = "dashmap"
version = "5.4.0"
@ -961,6 +971,7 @@ name = "lsp-server"
version = "0.7.4"
dependencies = [
"crossbeam-channel",
"ctrlc",
"log",
"lsp-types",
"serde",
@ -1100,6 +1111,17 @@ dependencies = [
"static_assertions",
]
[[package]]
name = "nix"
version = "0.27.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
dependencies = [
"bitflags 2.4.1",
"cfg-if",
"libc",
]
[[package]]
name = "nohash-hasher"
version = "0.2.0"
@ -1701,18 +1723,18 @@ dependencies = [
[[package]]
name = "serde"
version = "1.0.192"
version = "1.0.193"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
checksum = "25dd9975e68d0cb5aa1120c288333fc98731bd1dd12f561e468ea4728c042b89"
dependencies = [
"serde_derive",
]
[[package]]
name = "serde_derive"
version = "1.0.192"
version = "1.0.193"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
checksum = "43576ca501357b9b071ac53cdc7da8ef0cbd9493d8df094cd821777ea6e894d3"
dependencies = [
"proc-macro2",
"quote",

1
lib/lsp-server/Cargo.toml
View file

@ -14,3 +14,4 @@ crossbeam-channel = "0.5.6"
[dev-dependencies]
lsp-types = "=0.94"
ctrlc = "3.4.1"

169
lib/lsp-server/src/lib.rs
View file

@ -17,7 +17,7 @@ use std::{
net::{TcpListener, TcpStream, ToSocketAddrs},
};
use crossbeam_channel::{Receiver, Sender};
use crossbeam_channel::{Receiver, RecvTimeoutError, Sender};
pub use crate::{
error::{ExtractError, ProtocolError},
@ -113,11 +113,62 @@ impl Connection {
/// }
/// ```
pub fn initialize_start(&self) -> Result<(RequestId, serde_json::Value), ProtocolError> {
loop {
break match self.receiver.recv() {
Ok(Message::Request(req)) if req.is_initialize() => Ok((req.id, req.params)),
self.initialize_start_while(|| true)
}
/// Starts the initialization process by waiting for an initialize as described in
/// [`Self::initialize_start`] as long as `running` returns
/// `true` while the return value can be changed through a sig handler such as `CTRL + C`.
///
/// # Example
///
/// ```rust
/// use std::sync::atomic::{AtomicBool, Ordering};
/// use std::sync::Arc;
/// # use std::error::Error;
/// # use lsp_types::{ClientCapabilities, InitializeParams, ServerCapabilities};
/// # use lsp_server::{Connection, Message, Request, RequestId, Response};
/// # fn main() -> Result<(), Box<dyn Error + Sync + Send>> {
/// let running = Arc::new(AtomicBool::new(true));
/// # running.store(true, Ordering::SeqCst);
/// let r = running.clone();
///
/// ctrlc::set_handler(move || {
/// r.store(false, Ordering::SeqCst);
/// }).expect("Error setting Ctrl-C handler");
///
/// let (connection, io_threads) = Connection::stdio();
///
/// let res = connection.initialize_start_while(|| running.load(Ordering::SeqCst));
/// # assert!(res.is_err());
///
/// # Ok(())
/// # }
/// ```
pub fn initialize_start_while<C>(
&self,
running: C,
) -> Result<(RequestId, serde_json::Value), ProtocolError>
where
C: Fn() -> bool,
{
while running() {
let msg = match self.receiver.recv_timeout(std::time::Duration::from_secs(1)) {
Ok(msg) => msg,
Err(RecvTimeoutError::Timeout) => {
continue;
}
Err(e) => {
return Err(ProtocolError(format!(
"expected initialize request, got error: {e}"
)))
}
};
match msg {
Message::Request(req) if req.is_initialize() => return Ok((req.id, req.params)),
// Respond to non-initialize requests with ServerNotInitialized
Ok(Message::Request(req)) => {
Message::Request(req) => {
let resp = Response::new_err(
req.id.clone(),
ErrorCode::ServerNotInitialized as i32,
@ -126,15 +177,18 @@ impl Connection {
self.sender.send(resp.into()).unwrap();
continue;
}
Ok(Message::Notification(n)) if !n.is_exit() => {
Message::Notification(n) if !n.is_exit() => {
continue;
}
Ok(msg) => Err(ProtocolError(format!("expected initialize request, got {msg:?}"))),
Err(e) => {
Err(ProtocolError(format!("expected initialize request, got error: {e}")))
msg => {
return Err(ProtocolError(format!("expected initialize request, got {msg:?}")));
}
};
}
return Err(ProtocolError(String::from(
"Initialization has been aborted during initialization",
)));
}
/// Finishes the initialization process by sending an `InitializeResult` to the client
@ -156,6 +210,51 @@ impl Connection {
}
}
/// Finishes the initialization process as described in [`Self::initialize_finish`] as
/// long as `running` returns `true` while the return value can be changed through a sig
/// handler such as `CTRL + C`.
pub fn initialize_finish_while<C>(
&self,
initialize_id: RequestId,
initialize_result: serde_json::Value,
running: C,
) -> Result<(), ProtocolError>
where
C: Fn() -> bool,
{
let resp = Response::new_ok(initialize_id, initialize_result);
self.sender.send(resp.into()).unwrap();
while running() {
let msg = match self.receiver.recv_timeout(std::time::Duration::from_secs(1)) {
Ok(msg) => msg,
Err(RecvTimeoutError::Timeout) => {
continue;
}
Err(e) => {
return Err(ProtocolError(format!(
"expected initialized notification, got error: {e}",
)));
}
};
match msg {
Message::Notification(n) if n.is_initialized() => {
return Ok(());
}
msg => {
return Err(ProtocolError(format!(
r#"expected initialized notification, got: {msg:?}"#
)));
}
}
}
return Err(ProtocolError(String::from(
"Initialization has been aborted during initialization",
)));
}
/// Initialize the connection. Sends the server capabilities
/// to the client and returns the serialized client capabilities
/// on success. If more fine-grained initialization is required use
@ -198,6 +297,58 @@ impl Connection {
Ok(params)
}
/// Initialize the connection as described in [`Self::initialize`] as long as `running` returns
/// `true` while the return value can be changed through a sig handler such as `CTRL + C`.
///
/// # Example
///
/// ```rust
/// use std::sync::atomic::{AtomicBool, Ordering};
/// use std::sync::Arc;
/// # use std::error::Error;
/// # use lsp_types::ServerCapabilities;
/// # use lsp_server::{Connection, Message, Request, RequestId, Response};
///
/// # fn main() -> Result<(), Box<dyn Error + Sync + Send>> {
/// let running = Arc::new(AtomicBool::new(true));
/// # running.store(true, Ordering::SeqCst);
/// let r = running.clone();
///
/// ctrlc::set_handler(move || {
/// r.store(false, Ordering::SeqCst);
/// }).expect("Error setting Ctrl-C handler");
///
/// let (connection, io_threads) = Connection::stdio();
///
/// let server_capabilities = serde_json::to_value(&ServerCapabilities::default()).unwrap();
/// let initialization_params = connection.initialize_while(
/// server_capabilities,
/// || running.load(Ordering::SeqCst)
/// );
///
/// # assert!(initialization_params.is_err());
/// # Ok(())
/// # }
/// ```
pub fn initialize_while<C>(
&self,
server_capabilities: serde_json::Value,
running: C,
) -> Result<serde_json::Value, ProtocolError>
where
C: Fn() -> bool,
{
let (id, params) = self.initialize_start_while(&running)?;
let initialize_data = serde_json::json!({
"capabilities": server_capabilities,
});
self.initialize_finish_while(id, initialize_data, running)?;
Ok(params)
}
/// If `req` is `Shutdown`, respond to it and return `true`, otherwise return `false`
pub fn handle_shutdown(&self, req: &Request) -> Result<bool, ProtocolError> {
if !req.is_shutdown() {