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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
use std::error::Error;
use futures::future::{Empty, IntoStream};
use futures::sync::mpsc;
use futures::{future, Future, Poll, Sink, Stream};
use log::error;
use tokio_codec::{FramedRead, FramedWrite};
use tokio_io::{AsyncRead, AsyncWrite};
use tower_service::Service;
use super::codec::LanguageServerCodec;
use super::message::Incoming;
#[derive(Debug)]
pub struct Server<I, O, S = Nothing> {
stdin: I,
stdout: O,
interleave: S,
}
impl<I, O> Server<I, O, Nothing>
where
I: AsyncRead + Send + 'static,
O: AsyncWrite + Send + 'static,
{
pub fn new(stdin: I, stdout: O) -> Self {
Server {
stdin,
stdout,
interleave: Nothing::new(),
}
}
}
impl<I, O, S> Server<I, O, S>
where
I: AsyncRead + Send + 'static,
O: AsyncWrite + Send + 'static,
S: Stream<Item = String, Error = ()> + Send + 'static,
{
pub fn interleave<T>(self, stream: T) -> Server<I, O, T>
where
T: Stream<Item = String, Error = ()> + Send + 'static,
{
Server {
stdin: self.stdin,
stdout: self.stdout,
interleave: stream,
}
}
pub fn serve<T>(self, service: T) -> impl Future<Item = (), Error = ()> + Send
where
T: Service<Incoming, Response = String> + Send + 'static,
T::Error: Into<Box<dyn Error + Send + Sync>>,
T::Future: Send,
{
let (sender, receiver) = mpsc::channel(1);
let framed_stdin = FramedRead::new(self.stdin, LanguageServerCodec::default());
let framed_stdout = FramedWrite::new(self.stdout, LanguageServerCodec::default());
let interleave = self.interleave;
future::lazy(move || {
let printer = receiver
.select(interleave)
.map_err(|_| error!("failed to log message"))
.forward(framed_stdout.sink_map_err(|e| error!("failed to encode response: {}", e)))
.map(|_| ());
tokio_executor::spawn(printer);
framed_stdin
.map(Incoming::from)
.map_err(|e| error!("failed to decode message: {}", e))
.fold(service, move |mut service, line| {
let sender = sender.clone();
service
.call(line)
.map_err(|e| error!("{}", e.into()))
.and_then(move |resp| sender.send(resp).map_err(|_| unreachable!()))
.then(move |_| Ok(service))
})
.map(|_| ())
})
}
}
#[doc(hidden)]
#[derive(Debug)]
pub struct Nothing(IntoStream<Empty<String, ()>>);
impl Nothing {
fn new() -> Self {
Nothing(future::empty().into_stream())
}
}
impl Stream for Nothing {
type Item = String;
type Error = ();
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
self.0.poll()
}
}
#[cfg(test)]
mod tests {
use std::io::Cursor;
use futures::{future::FutureResult, stream, Async};
use tokio::runtime::current_thread;
use super::*;
#[derive(Debug)]
struct MockService;
impl Service<Incoming> for MockService {
type Response = String;
type Error = String;
type Future = FutureResult<Self::Response, Self::Error>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, request: Incoming) -> Self::Future {
future::ok(request.to_string())
}
}
fn mock_stdio() -> (Cursor<Box<[u8]>>, Cursor<Box<[u8]>>) {
let message = r#"{"jsonrpc":"2.0","method":"initialized"}"#;
let stdin = format!("Content-Length: {}\r\n\r\n{}", message.len(), message);
(
Cursor::new(stdin.into_bytes().into_boxed_slice()),
Cursor::new(Box::new([])),
)
}
#[test]
fn serves_on_stdio() {
let (stdin, stdout) = mock_stdio();
let server = Server::new(stdin, stdout).serve(MockService);
current_thread::block_on_all(server).expect("failed to decode/encode message");
}
#[test]
fn interleaves_messages() {
let message = r#"{"jsonrpc":"2.0","method":"initialized"}"#.to_owned();
let messages = stream::iter_ok(vec![message]);
let (stdin, stdout) = mock_stdio();
let server = Server::new(stdin, stdout)
.interleave(messages)
.serve(MockService);
current_thread::block_on_all(server).expect("failed to decode/encode message");
}
}