1 files changed, 249 insertions, 0 deletions

diff --git a/crates/server/src/main.rs b/crates/server/src/main.rs
new file mode 100644
index 000000000..116abce1c
--- /dev/null
+++ b/crates/server/src/main.rs
@@ -0,0 +1,249 @@
+#[macro_use]
+extern crate failure;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde;
+extern crate serde_json;
+extern crate languageserver_types;
+extern crate drop_bomb;
+#[macro_use]
+extern crate crossbeam_channel;
+extern crate threadpool;
+#[macro_use]
+extern crate log;
+extern crate flexi_logger;
+extern crate libeditor;
+extern crate libanalysis;
+
+mod io;
+mod caps;
+mod req;
+mod dispatch;
+mod handlers;
+
+use std::path::PathBuf;
+
+use threadpool::ThreadPool;
+use crossbeam_channel::{bounded, Sender, Receiver};
+use flexi_logger::Logger;
+use libanalysis::WorldState;
+use languageserver_types::{TextDocumentItem, VersionedTextDocumentIdentifier, TextDocumentIdentifier};
+
+use ::{
+    io::{Io, RawMsg},
+    handlers::{handle_syntax_tree, handle_extend_selection},
+};
+
+pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
+
+fn main() -> Result<()> {
+    Logger::with_env_or_str("m=trace, libanalysis=trace")
+        .log_to_file()
+        .directory("log")
+        .start()?;
+    info!("starting server");
+    match ::std::panic::catch_unwind(|| main_inner()) {
+        Ok(res) => {
+            info!("shutting down: {:?}", res);
+            res
+        }
+        Err(_) => {
+            error!("server panicked");
+            bail!("server panicked")
+        }
+    }
+}
+
+fn main_inner() -> Result<()> {
+    let mut io = Io::from_stdio();
+    let res = initialize(&mut io);
+    info!("shutting down IO...");
+    let io_res = io.stop();
+    info!("... IO is down");
+    match (res, io_res) {
+        (Ok(()), Ok(())) => Ok(()),
+        (res, Ok(())) => res,
+        (Ok(()), io_res) => io_res,
+        (res, Err(io_err)) => {
+            error!("shutdown error: {:?}", io_err);
+            res
+        }
+    }
+}
+
+fn initialize(io: &mut Io) -> Result<()> {
+    loop {
+        match io.recv()? {
+            RawMsg::Request(req) => {
+                if let Some((_params, resp)) = dispatch::expect_request::<req::Initialize>(io, req)? {
+                    resp.result(io, req::InitializeResult {
+                        capabilities: caps::SERVER_CAPABILITIES
+                    })?;
+                    match io.recv()? {
+                        RawMsg::Notification(n) => {
+                            if n.method != "initialized" {
+                                bail!("expected initialized notification");
+                            }
+                        }
+                        _ => {
+                            bail!("expected initialized notification");
+                        }
+                    }
+                    return initialized(io);
+                }
+            }
+            RawMsg::Notification(n) => {
+                bail!("expected initialize request, got {:?}", n)
+            }
+            RawMsg::Response(res) => {
+                bail!("expected initialize request, got {:?}", res)
+            }
+        }
+    }
+}
+
+type Thunk = Box<for<'a> FnBox<&'a mut Io, Result<()>>>;
+
+fn initialized(io: &mut Io) -> Result<()> {
+    let mut world = WorldState::new();
+    let mut pool = ThreadPool::new(4);
+    let (sender, receiver) = bounded::<Thunk>(16);
+    let res = main_loop(io, &mut world, &mut pool, sender, receiver.clone());
+    info!("waiting for background jobs to finish...");
+    receiver.for_each(drop);
+    pool.join();
+    info!("...background jobs have finished");
+    res
+}
+
+fn main_loop(
+    io: &mut Io,
+    world: &mut WorldState,
+    pool: &mut ThreadPool,
+    sender: Sender<Thunk>,
+    receiver: Receiver<Thunk>,
+) -> Result<()> {
+    info!("server initialized, serving requests");
+    loop {
+        enum Event {
+            Msg(RawMsg),
+            Thunk(Thunk),
+            ReceiverDead,
+        }
+
+        let event = select! {
+            recv(io.receiver(), msg) => match msg {
+                Some(msg) => Event::Msg(msg),
+                None => Event::ReceiverDead,
+            },
+            recv(receiver, thunk) => Event::Thunk(thunk.unwrap()),
+        };
+
+        let msg = match event {
+            Event::ReceiverDead => {
+                io.cleanup_receiver()?;
+                unreachable!();
+            }
+            Event::Thunk(thunk) => {
+                thunk.call_box(io)?;
+                continue;
+            }
+            Event::Msg(msg) => msg,
+        };
+
+        match msg {
+            RawMsg::Request(req) => {
+                let mut req = Some(req);
+                dispatch::handle_request::<req::SyntaxTree, _>(&mut req, |params, resp| {
+                    let world = world.snapshot();
+                    let sender = sender.clone();
+                    pool.execute(move || {
+                        let res = handle_syntax_tree(world, params);
+                        sender.send(Box::new(|io: &mut Io| resp.response(io, res)))
+                    });
+                    Ok(())
+                })?;
+                dispatch::handle_request::<req::ExtendSelection, _>(&mut req, |params, resp| {
+                    let world = world.snapshot();
+                    let sender = sender.clone();
+                    pool.execute(move || {
+                        let res = handle_extend_selection(world, params);
+                        sender.send(Box::new(|io: &mut Io| resp.response(io, res)))
+                    });
+                    Ok(())
+                })?;
+                dispatch::handle_request::<req::Shutdown, _>(&mut req, |(), resp| {
+                    resp.result(io, ())?;
+                    Ok(())
+                })?;
+                if let Some(req) = req {
+                    error!("unknown method: {:?}", req);
+                    dispatch::unknown_method(io, req)?;
+                }
+            }
+            RawMsg::Notification(not) => {
+                let mut not = Some(not);
+                dispatch::handle_notification::<req::DidOpenTextDocument, _>(&mut not, |params| {
+                    let path = params.text_document.file_path()?;
+                    world.change_overlay(path, Some(params.text_document.text));
+                    Ok(())
+                })?;
+                dispatch::handle_notification::<req::DidChangeTextDocument, _>(&mut not, |mut params| {
+                    let path = params.text_document.file_path()?;
+                    let text = params.content_changes.pop()
+                        .ok_or_else(|| format_err!("empty changes"))?
+                        .text;
+                    world.change_overlay(path, Some(text));
+                    Ok(())
+                })?;
+                dispatch::handle_notification::<req::DidCloseTextDocument, _>(&mut not, |params| {
+                    let path = params.text_document.file_path()?;
+                    world.change_overlay(path, None);
+                    Ok(())
+                })?;
+
+                if let Some(not) = not {
+                    error!("unhandled notification: {:?}", not)
+                }
+            }
+            msg => {
+                eprintln!("msg = {:?}", msg);
+            }
+        }
+    }
+}
+
+trait FnBox<A, R>: Send {
+    fn call_box(self: Box<Self>, a: A) -> R;
+}
+
+impl<A, R, F: FnOnce(A) -> R + Send> FnBox<A, R> for F {
+    fn call_box(self: Box<F>, a: A) -> R {
+        (*self)(a)
+    }
+}
+
+trait FilePath {
+    fn file_path(&self) -> Result<PathBuf>;
+}
+
+impl FilePath for TextDocumentItem {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.to_file_path()
+            .map_err(|()| format_err!("invalid uri: {}", self.uri))
+    }
+}
+
+impl FilePath for VersionedTextDocumentIdentifier {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.to_file_path()
+            .map_err(|()| format_err!("invalid uri: {}", self.uri))
+    }
+}
+
+impl FilePath for TextDocumentIdentifier {
+    fn file_path(&self) -> Result<PathBuf> {
+        self.uri.to_file_path()
+            .map_err(|()| format_err!("invalid uri: {}", self.uri))
+    }
+}