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Asyncify flake workspace loading task

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This commit is contained in:
oxalica 2023-04-16 15:14:06 +08:00
parent 0edd88a682
commit 578e2c28d3
3 changed files with 178 additions and 144 deletions
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5
clippy.toml Normal file
View File

@ -0,0 +1,5 @@
doc-valid-idents = [
"Nix",
"NixOS",
"..",
]

2
crates/nil/Cargo.toml
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@ -18,7 +18,7 @@ nix-interop = { path = "../nix-interop" }
serde_json = "1.0.82"
syntax = { path = "../syntax" }
text-size = "1.1.0"
tokio = { version = "1.27.0", features = ["io-std", "rt", "sync"] }
tokio = { version = "1.27.0", features = ["fs", "io-std", "rt", "sync"] }
tower = "0.4.13"
tracing = { version = "0.1.36", features = ["release_max_level_info"] }

315
crates/nil/src/server.rs
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@ -12,7 +12,7 @@ use lsp_types::{
DidOpenTextDocumentParams, InitializeParams, InitializeResult, InitializedParams, MessageType,
PublishDiagnosticsParams, ServerInfo, ShowMessageParams, Url,
};
use nix_interop::nixos_options::NixosOptions;
use nix_interop::nixos_options::{self, NixosOptions};
use nix_interop::{flake_lock, FLAKE_FILE, FLAKE_LOCK_FILE};
use std::backtrace::Backtrace;
use std::borrow::BorrowMut;
@ -22,10 +22,10 @@ use std::future::{ready, Future};
use std::io::ErrorKind;
use std::ops::ControlFlow;
use std::panic::UnwindSafe;
use std::path::Path;
use std::sync::{Arc, Once, RwLock};
use std::{fmt, fs, panic};
use tokio::task;
use std::{fmt, panic};
use tokio::task::JoinHandle;
use tokio::{fs, task};
const LSP_SERVER_NAME: &str = "nil";
@ -42,17 +42,10 @@ enum Event {
version: u64,
diagnostics: Vec<Diagnostic>,
},
LoadFlake(Result<LoadFlakeResult>),
NixosOptions(Result<NixosOptions>),
}
enum LoadFlakeResult {
IsFlake {
flake_info: FlakeInfo,
missing_inputs: bool,
},
NotFlake,
}
struct SetFlakeInfoEvent(Option<FlakeInfo>);
struct SetNixosOptionsEvent(NixosOptions);
pub struct Server {
// States.
@ -67,6 +60,10 @@ pub struct Server {
/// This is used to reload flake only once after the configuration is first loaded.
tried_flake_load: bool,
// Ongoing tasks.
load_flake_workspace_fut: Option<JoinHandle<()>>,
// Client socket.
client: ClientSocket,
}
@ -112,6 +109,9 @@ impl Server {
.request_snap::<req::DocumentHighlightRequest>(handler::document_highlight)
.request_snap::<lsp_ext::ParentModule>(handler::parent_module)
//// Events ////
.event(Self::on_set_flake_info)
.event(Self::on_set_nixos_options)
// TODO: Use individual event types instead.
.event(Self::on_event);
router
}
@ -126,6 +126,8 @@ impl Server {
version_counter: 0,
tried_flake_load: false,
load_flake_workspace_fut: None,
client,
}
}
@ -246,7 +248,7 @@ impl Server {
if !self.tried_flake_load {
self.tried_flake_load = true;
// TODO: Register file watcher for flake.lock.
self.spawn_load_flake();
self.spawn_load_flake_workspace();
}
}
Event::Diagnostics {
@ -274,142 +276,169 @@ impl Server {
}
_ => tracing::debug!("Ignore raced diagnostics of {uri}, version {version}"),
},
Event::LoadFlake(ret) => match ret {
Err(err) => {
self.client.show_message_ext(
MessageType::ERROR,
format!("Failed to load flake workspace: {err:#}"),
);
}
Ok(LoadFlakeResult::IsFlake {
flake_info,
missing_inputs,
}) => {
tracing::info!(
"Workspace is a flake (missing_inputs = {missing_inputs}): {flake_info:?}"
);
if missing_inputs {
self.client.show_message_ext(MessageType::WARNING, "Some flake inputs are not available, please run `nix flake archive` to fetch all inputs");
}
// TODO: A better way to retrieve the nixpkgs for options?
if let Some(nixpkgs_path) = flake_info
.input_store_paths
.get(NIXOS_OPTIONS_FLAKE_INPUT)
.and_then(VfsPath::as_path)
{
let nixpkgs_path = nixpkgs_path.to_owned();
let nix_binary = self.config.nix_binary.clone();
tracing::info!("Evaluating NixOS options from {}", nixpkgs_path.display());
self.spawn_task(Box::new(move || {
Event::NixosOptions(nix_interop::nixos_options::eval_all_options(
&nix_binary,
&nixpkgs_path,
))
}));
}
self.vfs.write().unwrap().set_flake_info(Some(flake_info));
self.apply_vfs_change();
}
Ok(LoadFlakeResult::NotFlake) => {
tracing::info!("Workspace is not a flake");
self.vfs.write().unwrap().set_flake_info(None);
self.apply_vfs_change();
}
},
Event::NixosOptions(ret) => match ret {
// Sanity check.
Ok(opts) if !opts.is_empty() => {
tracing::info!("Loaded NixOS options ({} top-level options)", opts.len());
self.vfs.write().unwrap().set_nixos_options(opts);
self.apply_vfs_change();
}
Ok(_) => {
tracing::error!("Empty NixOS options?");
}
Err(err) => {
tracing::error!("Failed to evalute NixOS options: {err}");
}
},
}
ControlFlow::Continue(())
}
/// Spawn a task to reload the flake.{nix,lock} and the locked inputs.
fn spawn_load_flake(&self) {
tracing::info!("Loading flake configuration");
/// Spawn a task to (re)load the flake workspace via `flake.{nix,lock}`, including flake info,
/// NixOS options and outputs (TODO).
fn spawn_load_flake_workspace(&mut self) {
let fut = task::spawn(Self::load_flake_workspace(
self.vfs.clone(),
self.config.clone(),
self.client.clone(),
));
if let Some(prev_fut) = self.load_flake_workspace_fut.replace(fut) {
prev_fut.abort();
}
}
let flake_path = self.config.root_path.join(FLAKE_FILE);
let lock_path = self.config.root_path.join(FLAKE_LOCK_FILE);
let nix_bin_path = self.config.nix_binary.clone();
async fn load_flake_workspace(
vfs: Arc<RwLock<Vfs>>,
config: Arc<Config>,
mut client: ClientSocket,
) {
tracing::info!("Loading flake workspace");
let vfs = self.vfs.clone();
let task = move || {
let flake_vpath = VfsPath::new(&flake_path);
let flake_src = match fs::read_to_string(&flake_path) {
Ok(src) => src,
// Not a flake.
Err(err) if err.kind() == ErrorKind::NotFound => {
return Ok(LoadFlakeResult::NotFlake);
}
// Read failure.
Err(err) => {
return Err(anyhow::Error::new(err)
.context(format!("Failed to read flake root {flake_path:?}")));
}
};
// Load the flake file in Vfs.
let flake_file = {
let mut vfs = vfs.write().unwrap();
match vfs.file_for_path(&flake_vpath) {
// If the file is already opened (transferred from client),
// prefer the managed one. It contains more recent unsaved changes.
Ok(file) => file,
// Otherwise, cache the file content from disk.
Err(_) => vfs.set_path_content(flake_vpath, flake_src),
}
};
let lock_src = match fs::read(&lock_path) {
Ok(lock_src) => lock_src,
// Flake without inputs.
Err(err) if err.kind() == ErrorKind::NotFound => {
return Ok(LoadFlakeResult::IsFlake {
missing_inputs: false,
flake_info: FlakeInfo {
flake_file,
input_store_paths: HashMap::new(),
},
});
}
Err(err) => {
return Err(anyhow::Error::new(err)
.context(format!("Failed to read flake lock {lock_path:?}")));
}
};
let inputs = flake_lock::resolve_flake_locked_inputs(&nix_bin_path, &lock_src)
.context("Failed to resolve flake inputs from lock file")?;
// We only need the map for input -> store path.
let inputs_cnt = inputs.len();
let input_store_paths = inputs
.into_iter()
.filter(|(_, input)| Path::new(&input.store_path).exists())
.map(|(key, input)| (key, VfsPath::new(input.store_path)))
.collect::<HashMap<_, _>>();
Ok(LoadFlakeResult::IsFlake {
missing_inputs: input_store_paths.len() != inputs_cnt,
flake_info: FlakeInfo {
flake_file,
input_store_paths,
},
})
let flake_info = match Self::load_flake_info(&vfs, &config).await {
Ok(ret) => {
let _: Result<_, _> = client.emit(SetFlakeInfoEvent(ret.clone()));
ret
}
Err(err) => {
client.show_message_ext(
MessageType::ERROR,
format!("Failed to load flake workspace: {err:#}"),
);
return;
}
};
self.spawn_task(Box::new(move || Event::LoadFlake(task())));
let Some(flake_info) = flake_info else { return };
if flake_info
.input_store_paths
.values()
.any(|path| !path.as_path().expect("Must be real paths").exists())
{
// TODO: Run it.
client.show_message_ext(
MessageType::WARNING,
"Some flake inputs are not available, please run `nix flake archive` to fetch all inputs",
);
return;
}
// TODO: A better way to retrieve the nixpkgs for options?
if let Some(nixpkgs_path) = flake_info
.input_store_paths
.get(NIXOS_OPTIONS_FLAKE_INPUT)
.and_then(VfsPath::as_path)
{
tracing::info!("Evaluating NixOS options from {}", nixpkgs_path.display());
// TODO: Async process.
let ret = task::spawn_blocking({
let nixpkgs_path = nixpkgs_path.to_owned();
move || nixos_options::eval_all_options(&config.nix_binary, &nixpkgs_path)
})
.await
.expect("Panicked while evaluting NixOS options")
.context("Failed to evaluate NixOS options");
match ret {
// Sanity check.
Ok(opts) if !opts.is_empty() => {
tracing::info!("Loaded NixOS options ({} top-level options)", opts.len());
let _: Result<_, _> = client.emit(SetNixosOptionsEvent(opts));
}
Ok(_) => tracing::error!("Empty NixOS options?"),
Err(err) => {
client.show_message_ext(MessageType::ERROR, format_args!("{err:#}"));
}
}
}
}
async fn load_flake_info(vfs: &RwLock<Vfs>, config: &Config) -> Result<Option<FlakeInfo>> {
tracing::info!("Loading flake info");
let flake_path = config.root_path.join(FLAKE_FILE);
let lock_path = config.root_path.join(FLAKE_LOCK_FILE);
let flake_vpath = VfsPath::new(&flake_path);
let flake_src = match fs::read_to_string(&flake_path).await {
Ok(src) => src,
// Not a flake.
Err(err) if err.kind() == ErrorKind::NotFound => {
return Ok(None);
}
// Read failure.
Err(err) => {
return Err(anyhow::Error::new(err)
.context(format!("Failed to read flake root {flake_path:?}")));
}
};
// Load the flake file in Vfs.
let flake_file = {
let mut vfs = vfs.write().unwrap();
match vfs.file_for_path(&flake_vpath) {
// If the file is already opened (transferred from client),
// prefer the managed one. It contains more recent unsaved changes.
Ok(file) => file,
// Otherwise, cache the file content from disk.
Err(_) => vfs.set_path_content(flake_vpath, flake_src),
}
};
let lock_src = match fs::read(&lock_path).await {
Ok(lock_src) => lock_src,
// Flake without inputs has no lock file.
Err(err) if err.kind() == ErrorKind::NotFound => {
return Ok(Some(FlakeInfo {
flake_file,
input_store_paths: HashMap::new(),
}));
}
Err(err) => {
return Err(anyhow::Error::new(err)
.context(format!("Failed to read flake lock {lock_path:?}")));
}
};
let inputs = task::spawn_blocking({
let nix_binary = config.nix_binary.clone();
move || {
// TODO: Async process.
flake_lock::resolve_flake_locked_inputs(&nix_binary, &lock_src)
}
})
.await
.expect("Panicked while resolving flake lock")
.context("Failed to resolve flake inputs from lock file")?;
// We only need the map for input -> store path.
let input_store_paths = inputs
.into_iter()
.map(|(key, input)| (key, VfsPath::new(input.store_path)))
.collect();
Ok(Some(FlakeInfo {
flake_file,
input_store_paths,
}))
}
fn on_set_flake_info(&mut self, info: SetFlakeInfoEvent) -> NotifyResult {
tracing::debug!("Set flake info: {:?}", info.0);
self.vfs.write().unwrap().set_flake_info(info.0);
self.apply_vfs_change();
ControlFlow::Continue(())
}
fn on_set_nixos_options(&mut self, opts: SetNixosOptionsEvent) -> NotifyResult {
tracing::debug!("Set NixOS options ({:?} top-levels)", opts.0.len());
self.vfs.write().unwrap().set_nixos_options(opts.0);
self.apply_vfs_change();
ControlFlow::Continue(())
}
fn spawn_reload_config(&self) {