Add an integration test

crates/gen_lsp_server/src/lib.rs

@@ -15,7 +15,7 @@ mod stdio;
 use crossbeam_channel::{Sender, Receiver};
 use languageserver_types::{
     ServerCapabilities, InitializeResult,
-    request::{Initialize},
+    request::{Initialize, Shutdown},
     notification::{Initialized, Exit},
 };
 
@@ -48,6 +48,17 @@ pub fn run_server(
     Ok(())
 }
 
+pub fn handle_shutdown(req: RawRequest, sender: &Sender<RawMessage>) -> Option<RawRequest> {
+    match req.cast::<Shutdown>() {
+        Ok((id, ())) => {
+            let resp = RawResponse::ok::<Shutdown>(id, ());
+            sender.send(RawMessage::Response(resp));
+            None
+        }
+        Err(req) => Some(req),
+    }
+}
+
 fn initialize(
     receiver: &mut Receiver<RawMessage>,
     sender: &mut Sender<RawMessage>,
@@ -61,7 +72,7 @@ fn initialize(
         msg =>
             bail!("expected initialize request, got {:?}", msg),
     };
-    let resp = RawResponse::ok(id, InitializeResult { capabilities: caps });
+    let resp = RawResponse::ok::<Initialize>(id, InitializeResult { capabilities: caps });
     sender.send(RawMessage::Response(resp));
     match receiver.recv() {
         Some(RawMessage::Notification(n)) => {

crates/gen_lsp_server/src/msg.rs

@@ -87,6 +87,17 @@ impl RawMessage {
 }
 
 impl RawRequest {
+    pub fn new<R>(id: u64, params: R::Params) -> RawRequest
+    where
+        R: Request,
+        R::Params: Serialize,
+    {
+        RawRequest {
+            id: id,
+            method: R::METHOD.to_string(),
+            params: to_value(&params).unwrap(),
+        }
+    }
     pub fn cast<R>(self) -> ::std::result::Result<(u64, R::Params), RawRequest>
     where
         R: Request,
@@ -102,7 +113,10 @@ impl RawRequest {
 }
 
 impl RawResponse {
-    pub fn ok(id: u64, result: impl Serialize) -> RawResponse {
+    pub fn ok<R>(id: u64, result: R::Result) -> RawResponse
+    where R: Request,
+          R::Result: Serialize,
+    {
         RawResponse {
             id,
             result: Some(to_value(&result).unwrap()),

crates/server/Cargo.toml

@@ -24,3 +24,6 @@ libsyntax2 = { path = "../libsyntax2" }
 libeditor = { path = "../libeditor" }
 libanalysis = { path = "../libanalysis" }
 gen_lsp_server = { path = "../gen_lsp_server" }
+
+[dev-dependencies]
+tempdir = "0.3.7"

crates/server/src/lib.rs

@@ -21,7 +21,7 @@ extern crate im;
 extern crate relative_path;
 
 mod caps;
-mod req;
+pub mod req;
 mod conv;
 mod main_loop;
 mod vfs;

crates/server/src/main_loop/mod.rs

@@ -11,7 +11,10 @@ use serde::{Serialize, de::DeserializeOwned};
 use crossbeam_channel::{bounded, Sender, Receiver};
 use languageserver_types::{NumberOrString};
 use libanalysis::{FileId, JobHandle, JobToken};
-use gen_lsp_server::{RawRequest, RawNotification, RawMessage, RawResponse, ErrorCode};
+use gen_lsp_server::{
+    RawRequest, RawNotification, RawMessage, RawResponse, ErrorCode,
+    handle_shutdown,
+};
 
 use {
     req,
@@ -21,6 +24,7 @@ use {
     main_loop::subscriptions::{Subscriptions},
 };
 
+#[derive(Debug)]
 enum Task {
     Respond(RawResponse),
     Notify(RawNotification),
@@ -40,7 +44,7 @@ pub fn main_loop(
 
     let mut pending_requests = HashMap::new();
     let mut subs = Subscriptions::new();
-    main_loop_inner(
+    let res = main_loop_inner(
         &pool,
         msg_receriver,
         msg_sender,
@@ -50,17 +54,19 @@ pub fn main_loop(
         &mut state,
         &mut pending_requests,
         &mut subs,
-    )?;
+    );
 
-    info!("waiting for background jobs to finish...");
+    info!("waiting for tasks to finish...");
     task_receiver.for_each(|task| on_task(task, msg_sender, &mut pending_requests));
+    info!("...tasks have finished");
+    info!("joining threadpool...");
     pool.join();
-    info!("...background jobs have finished");
+    info!("...threadpool has finished");
 
     info!("waiting for file watcher to finish...");
     watcher.stop()?;
     info!("...file watcher has finished");
-    Ok(())
+    res
 }
 
 fn main_loop_inner(
@@ -73,15 +79,17 @@ fn main_loop_inner(
     state: &mut ServerWorldState,
     pending_requests: &mut HashMap<u64, JobHandle>,
     subs: &mut Subscriptions,
-) -> Result<u64> {
+) -> Result<()> {
     let mut fs_receiver = Some(fs_receiver);
     loop {
+        #[derive(Debug)]
         enum Event {
             Msg(RawMessage),
             Task(Task),
             Fs(Vec<FileEvent>),
             FsWatcherDead,
         }
+        trace!("selecting");
         let event = select! {
             recv(msg_receiver, msg) => match msg {
                 Some(msg) => Event::Msg(msg),
@@ -93,6 +101,7 @@ fn main_loop_inner(
                 None => Event::FsWatcherDead,
             }
         };
+        trace!("selected {:?}", event);
         let mut state_changed = false;
         match event {
             Event::FsWatcherDead => fs_receiver = None,
@@ -105,9 +114,9 @@ fn main_loop_inner(
             Event::Msg(msg) => {
                 match msg {
                     RawMessage::Request(req) => {
-                        let req = match req.cast::<req::Shutdown>() {
+                        let req = match handle_shutdown(req, msg_sender) {
-                            Ok((id, _params)) => return Ok(id),
+                            Some(req) => req,
-                            Err(req) => req,
+                            None => return Ok(()),
                         };
                         match on_request(state, pending_requests, pool, &task_sender, req)? {
                             None => (),
@@ -290,7 +299,7 @@ impl<'a> PoolDispatcher<'a> {
                 let sender = self.sender.clone();
                 self.pool.execute(move || {
                     let resp = match f(world, params, token) {
-                        Ok(resp) => RawResponse::ok(id, resp),
+                        Ok(resp) => RawResponse::ok::<R>(id, resp),
                         Err(e) => RawResponse::err(id, ErrorCode::InternalError as i32, e.to_string()),
                     };
                     let task = Task::Respond(resp);

crates/server/src/req.rs

@@ -127,7 +127,7 @@ impl Request for Runnables {
     const METHOD: &'static str = "m/runnables";
 }
 
-#[derive(Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct RunnablesParams {
     pub text_document: TextDocumentIdentifier,

crates/server/src/vfs.rs

@@ -11,11 +11,13 @@ use walkdir::WalkDir;
 use Result;
 
 
+#[derive(Debug)]
 pub struct FileEvent {
     pub path: PathBuf,
     pub kind: FileEventKind,
 }
 
+#[derive(Debug)]
 pub enum FileEventKind {
     Add(String),
     #[allow(unused)]

crates/server/tests/heavy_tests/main.rs

@@ -0,0 +1,42 @@
+extern crate tempdir;
+extern crate crossbeam_channel;
+extern crate languageserver_types;
+extern crate serde;
+extern crate serde_json;
+extern crate gen_lsp_server;
+extern crate flexi_logger;
+extern crate m;
+
+mod support;
+
+use m::req::{Runnables, RunnablesParams};
+
+use support::project;
+
+#[test]
+fn test_runnables() {
+    let server = project(r"
+//- lib.rs
+#[test]
+fn foo() {
+}
+");
+    server.request::<Runnables>(
+        RunnablesParams {
+            text_document: server.doc_id("lib.rs"),
+            position: None,
+        },
+        r#"[
+          {
+            "args": [ "test", "--", "foo", "--nocapture" ],
+            "bin": "cargo",
+            "env": { "RUST_BACKTRACE": "short" },
+            "label": "test foo",
+            "range": {
+              "end": { "character": 1, "line": 2 },
+              "start": { "character": 0, "line": 0 }
+            }
+          }
+        ]"#
+    );
+}

crates/server/tests/heavy_tests/support.rs

@@ -0,0 +1,169 @@
+use std::{
+    fs,
+    thread,
+    cell::Cell,
+    path::PathBuf,
+};
+
+use tempdir::TempDir;
+use crossbeam_channel::{bounded, Sender, Receiver};
+use flexi_logger::Logger;
+use languageserver_types::{
+    Url,
+    TextDocumentIdentifier,
+    request::{Request, Shutdown},
+    notification::DidOpenTextDocument,
+    DidOpenTextDocumentParams,
+    TextDocumentItem,
+};
+use serde::Serialize;
+use serde_json::{Value, from_str, to_string_pretty};
+use gen_lsp_server::{RawMessage, RawRequest, RawNotification};
+
+use m::{Result, main_loop};
+
+pub fn project(fixture: &str) -> Server {
+    Logger::with_env_or_str("").start().unwrap();
+
+    let tmp_dir = TempDir::new("test-project")
+        .unwrap();
+    let mut buf = String::new();
+    let mut file_name = None;
+    let mut paths = vec![];
+    macro_rules! flush {
+        () => {
+            if let Some(file_name) = file_name {
+                let path = tmp_dir.path().join(file_name);
+                fs::write(path.as_path(), buf.as_bytes()).unwrap();
+                paths.push((path, buf.clone()));
+            }
+        }
+    };
+    for line in fixture.lines() {
+        if line.starts_with("//-") {
+            flush!();
+            buf.clear();
+            file_name = Some(line["//-".len()..].trim());
+            continue;
+        }
+        buf.push_str(line);
+        buf.push('\n');
+    }
+    flush!();
+
+    Server::new(tmp_dir, paths)
+}
+
+pub struct Server {
+    req_id: Cell<u64>,
+    dir: TempDir,
+    sender: Option<Sender<RawMessage>>,
+    receiver: Receiver<RawMessage>,
+    server: Option<thread::JoinHandle<Result<()>>>,
+}
+
+impl Server {
+    fn new(dir: TempDir, files: Vec<(PathBuf, String)>) -> Server {
+        let path = dir.path().to_path_buf();
+        let (client_sender, mut server_receiver) = bounded(1);
+        let (mut server_sender, client_receiver) = bounded(1);
+        let server = thread::spawn(move || main_loop(path, &mut server_receiver, &mut server_sender));
+        let res = Server {
+            req_id: Cell::new(1),
+            dir,
+            sender: Some(client_sender),
+            receiver: client_receiver,
+            server: Some(server),
+        };
+        for (path, text) in files {
+            res.send_notification(RawNotification::new::<DidOpenTextDocument>(
+                DidOpenTextDocumentParams {
+                    text_document: TextDocumentItem {
+                        uri: Url::from_file_path(path).unwrap(),
+                        language_id: "rust".to_string(),
+                        version: 0,
+                        text,
+                    }
+                }
+            ))
+        }
+        res
+    }
+
+    pub fn doc_id(&self, rel_path: &str) -> TextDocumentIdentifier {
+        let path = self.dir.path().join(rel_path);
+        TextDocumentIdentifier {
+            uri: Url::from_file_path(path).unwrap(),
+        }
+    }
+
+    pub fn request<R>(
+        &self,
+        params: R::Params,
+        expected_resp: &str,
+    )
+    where
+        R: Request,
+        R::Params: Serialize,
+    {
+        let id = self.req_id.get();
+        self.req_id.set(id + 1);
+        let expected_resp: Value = from_str(expected_resp).unwrap();
+        let actual = self.send_request::<R>(id, params);
+        assert_eq!(
+            expected_resp, actual,
+            "Expected:\n{}\n\
+             Actual:\n{}\n",
+            to_string_pretty(&expected_resp).unwrap(),
+            to_string_pretty(&actual).unwrap(),
+        );
+    }
+
+    fn send_request<R>(&self, id: u64, params: R::Params) -> Value
+    where
+        R: Request,
+        R::Params: Serialize,
+    {
+        let r = RawRequest::new::<R>(id, params);
+        self.sender.as_ref()
+            .unwrap()
+            .send(RawMessage::Request(r));
+
+        while let Some(msg) = self.receiver.recv() {
+            match msg {
+                RawMessage::Request(req) => panic!("unexpected request: {:?}", req),
+                RawMessage::Notification(_) => (),
+                RawMessage::Response(res) => {
+                    assert_eq!(res.id, id);
+                    if let Some(err) = res.error {
+                        panic!("error response: {:#?}", err);
+                    }
+                    return res.result.unwrap();
+                }
+            }
+        }
+        panic!("no response");
+    }
+    fn send_notification(&self, not: RawNotification) {
+
+        self.sender.as_ref()
+            .unwrap()
+            .send(RawMessage::Notification(not));
+    }
+}
+
+impl Drop for Server {
+    fn drop(&mut self) {
+        {
+            self.send_request::<Shutdown>(666, ());
+            drop(self.sender.take().unwrap());
+            while let Some(msg) = self.receiver.recv() {
+                drop(msg);
+            }
+        }
+        eprintln!("joining server");
+        self.server.take()
+            .unwrap()
+            .join().unwrap().unwrap();
+    }
+}