summaryrefslogtreecommitdiff
path: root/support/texlab/crates/jsonrpc/src/lib.rs
blob: 8786598d58d7b8979be74ca8984223ed1213874f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
pub mod client;
pub mod server;
mod types;

pub use self::{
    client::{Client, ResponseHandler},
    server::{handle_notification, handle_request, Middleware, RequestHandler},
    types::*,
};

use futures::channel::*;
use futures::prelude::*;
use log::error;
use std::io;
use std::sync::Arc;

pub struct MessageHandler<S, C, I> {
    pub server: Arc<S>,
    pub client: Arc<C>,
    pub input: I,
    pub output: mpsc::Sender<String>,
}

impl<S, C, I> MessageHandler<S, C, I>
where
    S: RequestHandler + Middleware + Send + Sync + 'static,
    C: ResponseHandler + Send + Sync + 'static,
    I: Stream<Item = io::Result<String>> + Unpin,
{
    pub async fn listen(&mut self) {
        while let Some(json) = self.input.next().await {
            self.server.before_message().await;

            match serde_json::from_str(&json.unwrap()).map_err(|_| Error::parse_error()) {
                Ok(Message::Request(request)) => {
                    let server = Arc::clone(&self.server);
                    let mut output = self.output.clone();
                    tokio::spawn(async move {
                        let response = server.handle_request(request).await;
                        if let Some(error) = response.error.as_ref() {
                            error!("{:?}", error);
                        }
                        let json = serde_json::to_string(&response).unwrap();
                        output.send(json).await.unwrap();
                        server.after_message().await;
                    });
                }
                Ok(Message::Notification(notification)) => {
                    self.server.handle_notification(notification);
                    self.after_message();
                }
                Ok(Message::Response(response)) => {
                    self.client.handle(response).await;
                    self.after_message();
                }
                Err(why) => {
                    let response = Response::error(why, None);
                    let json = serde_json::to_string(&response).unwrap();
                    self.output.send(json).await.unwrap();
                    self.after_message();
                }
            };
        }
    }

    fn after_message(&self) {
        let server = Arc::clone(&self.server);
        tokio::spawn(async move {
            server.after_message().await;
        });
    }
}