forked from Mirrors/helix
wip: Fetching diagnostics, parsing notifications.
Blaž Hrastnik
4 years ago
parent
f03830b047
commit
13cb442850
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use std::collections::HashMap;
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use crate::{Message, Notification};
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use jsonrpc_core as jsonrpc;
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use lsp_types as lsp;
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use serde_json::Value;
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use smol::prelude::*;
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use smol::{
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channel::{Receiver, Sender},
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io::{BufReader, BufWriter},
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process::{ChildStderr, ChildStdin, ChildStdout},
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Executor,
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};
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pub(crate) enum Payload {
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Request {
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chan: Sender<anyhow::Result<Value>>,
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value: jsonrpc::MethodCall,
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},
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Notification(jsonrpc::Notification),
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}
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pub(crate) struct Transport {
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incoming: Sender<Message>,
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outgoing: Receiver<Payload>,
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pending_requests: HashMap<jsonrpc::Id, Sender<anyhow::Result<Value>>>,
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headers: HashMap<String, String>,
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writer: BufWriter<ChildStdin>,
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reader: BufReader<ChildStdout>,
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}
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impl Transport {
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pub fn start(
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ex: &Executor,
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reader: BufReader<ChildStdout>,
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writer: BufWriter<ChildStdin>,
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) -> (Receiver<Message>, Sender<Payload>) {
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let (incoming, rx) = smol::channel::unbounded();
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let (tx, outgoing) = smol::channel::unbounded();
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let transport = Self {
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reader,
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writer,
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incoming,
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outgoing,
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pending_requests: Default::default(),
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headers: Default::default(),
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};
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ex.spawn(transport.duplex()).detach();
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(rx, tx)
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}
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async fn recv(
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reader: &mut (impl AsyncBufRead + Unpin),
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headers: &mut HashMap<String, String>,
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) -> Result<Message, std::io::Error> {
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// read headers
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loop {
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let mut header = String::new();
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// detect pipe closed if 0
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reader.read_line(&mut header).await?;
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let header = header.trim();
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if header.is_empty() {
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break;
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}
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let parts: Vec<&str> = header.split(": ").collect();
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if parts.len() != 2 {
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// return Err(Error::new(ErrorKind::Other, "Failed to parse header"));
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panic!()
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}
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headers.insert(parts[0].to_string(), parts[1].to_string());
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}
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// find content-length
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let content_length = headers.get("Content-Length").unwrap().parse().unwrap();
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let mut content = vec![0; content_length];
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reader.read_exact(&mut content).await?;
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let msg = String::from_utf8(content).unwrap();
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// read data
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// try parsing as output (server response) or call (server request)
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let output: serde_json::Result<Message> = serde_json::from_str(&msg);
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Ok(output?)
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}
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pub async fn send_payload(&mut self, payload: Payload) -> anyhow::Result<()> {
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match payload {
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Payload::Request { chan, value } => {
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self.pending_requests.insert(value.id.clone(), chan);
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let json = serde_json::to_string(&value)?;
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self.send(json).await
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}
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Payload::Notification(value) => {
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let json = serde_json::to_string(&value)?;
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self.send(json).await
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}
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}
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}
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pub async fn send(&mut self, request: String) -> anyhow::Result<()> {
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println!("-> {}", request);
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// send the headers
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self.writer
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.write_all(format!("Content-Length: {}\r\n\r\n", request.len()).as_bytes())
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.await?;
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// send the body
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self.writer.write_all(request.as_bytes()).await?;
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self.writer.flush().await?;
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Ok(())
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}
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pub async fn recv_msg(&mut self, msg: Message) -> anyhow::Result<()> {
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match msg {
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Message::Output(output) => self.recv_response(output).await?,
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Message::Notification(jsonrpc::Notification { method, params, .. }) => {
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let notification = Notification::parse(&method, params);
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println!("<- {} {:?}", method, notification);
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// dispatch
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}
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Message::Call(call) => {
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println!("<- {:?}", call);
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// dispatch
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}
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_ => unreachable!(),
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};
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Ok(())
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}
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pub async fn recv_response(&mut self, output: jsonrpc::Output) -> anyhow::Result<()> {
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match output {
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jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => {
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println!("<- {}", result);
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let tx = self
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.pending_requests
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.remove(&id)
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.expect("pending_request with id not found!");
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tx.send(Ok(result)).await?;
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}
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jsonrpc::Output::Failure(_) => panic!("recv fail"),
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msg => unimplemented!("{:?}", msg),
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}
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Ok(())
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}
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pub async fn duplex(mut self) {
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use futures_util::{select, FutureExt};
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loop {
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select! {
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// client -> server
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msg = self.outgoing.next().fuse() => {
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if msg.is_none() {
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break;
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}
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let msg = msg.unwrap();
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self.send_payload(msg).await.unwrap();
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}
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// server <- client
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msg = Self::recv(&mut self.reader, &mut self.headers).fuse() => {
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if msg.is_err() {
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break;
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}
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let msg = msg.unwrap();
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self.recv_msg(msg).await.unwrap();
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}
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}
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}
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}
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}
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