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Streamline flycheck implementation

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This commit is contained in:
Aleksey Kladov 2020-04-01 00:39:50 +02:00
parent b46fd38632
commit c86d8d40c2
1 changed files with 68 additions and 80 deletions
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148
crates/ra_flycheck/src/lib.rs
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@ -79,8 +79,15 @@ pub enum CheckCommand {
struct CheckWatcherThread {
options: CheckConfig,
workspace_root: PathBuf,
watcher: WatchThread,
last_update_req: Option<Instant>,
// XXX: drop order is significant
message_recv: Receiver<CheckEvent>,
/// WatchThread exists to wrap around the communication needed to be able to
/// run `cargo check` without blocking. Currently the Rust standard library
/// doesn't provide a way to read sub-process output without blocking, so we
/// have to wrap sub-processes output handling in a thread and pass messages
/// back over a channel.
check_process: Option<jod_thread::JoinHandle<()>>,
}
impl CheckWatcherThread {
@ -88,8 +95,9 @@ impl CheckWatcherThread {
CheckWatcherThread {
options,
workspace_root,
watcher: WatchThread::dummy(),
last_update_req: None,
message_recv: never(),
check_process: None,
}
}
@ -106,25 +114,21 @@ impl CheckWatcherThread {
break;
},
},
recv(self.watcher.message_recv) -> msg => match msg {
recv(self.message_recv) -> msg => match msg {
Ok(msg) => self.handle_message(msg, task_send),
Err(RecvError) => {
// Watcher finished, replace it with a never channel to
// avoid busy-waiting.
std::mem::replace(&mut self.watcher.message_recv, never());
self.message_recv = never();
self.check_process = None;
},
}
};
if self.should_recheck() {
self.last_update_req.take();
self.last_update_req = None;
task_send.send(CheckTask::ClearDiagnostics).unwrap();
// Replace with a dummy watcher first so we drop the original and wait for completion
std::mem::replace(&mut self.watcher, WatchThread::dummy());
// Then create the actual new watcher
self.watcher = WatchThread::new(&self.options, &self.workspace_root);
self.restart_check_process();
}
}
}
@ -207,6 +211,59 @@ impl CheckWatcherThread {
CheckEvent::Msg(Message::Unknown) => {}
}
}
fn restart_check_process(&mut self) {
// First, clear and cancel the old thread
self.message_recv = never();
self.check_process = None;
if !self.options.enable {
return;
}
let mut args: Vec<String> = vec![
self.options.command.clone(),
"--workspace".to_string(),
"--message-format=json".to_string(),
"--manifest-path".to_string(),
format!("{}/Cargo.toml", self.workspace_root.display()),
];
if self.options.all_targets {
args.push("--all-targets".to_string());
}
args.extend(self.options.args.iter().cloned());
let (message_send, message_recv) = unbounded();
let workspace_root = self.workspace_root.to_owned();
self.message_recv = message_recv;
self.check_process = Some(jod_thread::spawn(move || {
// If we trigger an error here, we will do so in the loop instead,
// which will break out of the loop, and continue the shutdown
let _ = message_send.send(CheckEvent::Begin);
let res = run_cargo(&args, Some(&workspace_root), &mut |message| {
// Skip certain kinds of messages to only spend time on what's useful
match &message {
Message::CompilerArtifact(artifact) if artifact.fresh => return true,
Message::BuildScriptExecuted(_) => return true,
Message::Unknown => return true,
_ => {}
}
// if the send channel was closed, we want to shutdown
message_send.send(CheckEvent::Msg(message)).is_ok()
});
if let Err(err) = res {
// FIXME: make the `message_send` to be `Sender<Result<CheckEvent, CargoError>>`
// to display user-caused misconfiguration errors instead of just logging them here
log::error!("Cargo watcher failed {:?}", err);
}
// We can ignore any error here, as we are already in the progress
// of shutting down.
let _ = message_send.send(CheckEvent::End);
}))
}
}
#[derive(Debug)]
@ -215,19 +272,6 @@ pub struct DiagnosticWithFixes {
fixes: Vec<CodeAction>,
}
/// WatchThread exists to wrap around the communication needed to be able to
/// run `cargo check` without blocking. Currently the Rust standard library
/// doesn't provide a way to read sub-process output without blocking, so we
/// have to wrap sub-processes output handling in a thread and pass messages
/// back over a channel.
/// The correct way to dispose of the thread is to drop it, on which the
/// sub-process will be killed, and the thread will be joined.
struct WatchThread {
// XXX: drop order is significant
message_recv: Receiver<CheckEvent>,
_handle: Option<jod_thread::JoinHandle<()>>,
}
enum CheckEvent {
Begin,
Msg(cargo_metadata::Message),
@ -317,59 +361,3 @@ fn run_cargo(
Err(CargoError(err_msg))
}
impl WatchThread {
fn dummy() -> WatchThread {
WatchThread { message_recv: never(), _handle: None }
}
fn new(options: &CheckConfig, workspace_root: &Path) -> WatchThread {
let mut args: Vec<String> = vec![
options.command.clone(),
"--workspace".to_string(),
"--message-format=json".to_string(),
"--manifest-path".to_string(),
format!("{}/Cargo.toml", workspace_root.display()),
];
if options.all_targets {
args.push("--all-targets".to_string());
}
args.extend(options.args.iter().cloned());
let (message_send, message_recv) = unbounded();
let workspace_root = workspace_root.to_owned();
let handle = if options.enable {
Some(jod_thread::spawn(move || {
// If we trigger an error here, we will do so in the loop instead,
// which will break out of the loop, and continue the shutdown
let _ = message_send.send(CheckEvent::Begin);
let res = run_cargo(&args, Some(&workspace_root), &mut |message| {
// Skip certain kinds of messages to only spend time on what's useful
match &message {
Message::CompilerArtifact(artifact) if artifact.fresh => return true,
Message::BuildScriptExecuted(_) => return true,
Message::Unknown => return true,
_ => {}
}
// if the send channel was closed, we want to shutdown
message_send.send(CheckEvent::Msg(message)).is_ok()
});
if let Err(err) = res {
// FIXME: make the `message_send` to be `Sender<Result<CheckEvent, CargoError>>`
// to display user-caused misconfiguration errors instead of just logging them here
log::error!("Cargo watcher failed {:?}", err);
}
// We can ignore any error here, as we are already in the progress
// of shutting down.
let _ = message_send.send(CheckEvent::End);
}))
} else {
None
};
WatchThread { message_recv, _handle: handle }
}
}