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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
use std::collections::HashMap;
use std::io;
use log::{error, info};
use crate::Error;
type Result<T> = core::result::Result<T, Error>;
use jsonrpc_core as jsonrpc;
use serde_json::Value;
use smol::prelude::*;
use smol::{
channel::{Receiver, Sender},
io::{BufReader, BufWriter},
process::{ChildStderr, ChildStdin, ChildStdout},
Executor,
};
pub(crate) enum Payload {
Request {
chan: Sender<Result<Value>>,
value: jsonrpc::MethodCall,
},
Notification(jsonrpc::Notification),
Response(jsonrpc::Output),
}
use serde::{Deserialize, Serialize};
/// A type representing all possible values sent from the server to the client.
#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
#[serde(untagged)]
enum Message {
/// A regular JSON-RPC request output (single response).
Output(jsonrpc::Output),
/// A JSON-RPC request or notification.
Call(jsonrpc::Call),
}
pub(crate) struct Transport {
incoming: Sender<jsonrpc::Call>,
outgoing: Receiver<Payload>,
pending_requests: HashMap<jsonrpc::Id, Sender<Result<Value>>>,
headers: HashMap<String, String>,
writer: BufWriter<ChildStdin>,
reader: BufReader<ChildStdout>,
stderr: BufReader<ChildStderr>,
}
impl Transport {
pub fn start(
ex: &Executor,
reader: BufReader<ChildStdout>,
writer: BufWriter<ChildStdin>,
stderr: BufReader<ChildStderr>,
) -> (Receiver<jsonrpc::Call>, Sender<Payload>) {
let (incoming, rx) = smol::channel::unbounded();
let (tx, outgoing) = smol::channel::unbounded();
let transport = Self {
reader,
writer,
stderr,
incoming,
outgoing,
pending_requests: Default::default(),
headers: Default::default(),
};
ex.spawn(transport.duplex()).detach();
(rx, tx)
}
async fn recv(
reader: &mut (impl AsyncBufRead + Unpin),
headers: &mut HashMap<String, String>,
) -> core::result::Result<Message, std::io::Error> {
// read headers
loop {
let mut header = String::new();
// detect pipe closed if 0
reader.read_line(&mut header).await?;
let header = header.trim();
if header.is_empty() {
break;
}
let parts: Vec<&str> = header.split(": ").collect();
if parts.len() != 2 {
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"Failed to parse header",
));
}
headers.insert(parts[0].to_string(), parts[1].to_string());
}
// find content-length
let content_length = headers.get("Content-Length").unwrap().parse().unwrap();
let mut content = vec![0; content_length];
reader.read_exact(&mut content).await?;
let msg = String::from_utf8(content).unwrap();
// read data
info!("<- {}", msg);
// try parsing as output (server response) or call (server request)
let output: serde_json::Result<Message> = serde_json::from_str(&msg);
Ok(output?)
}
async fn err(
err: &mut (impl AsyncBufRead + Unpin),
) -> core::result::Result<(), std::io::Error> {
let mut line = String::new();
err.read_line(&mut line).await?;
error!("err <- {}", line);
Ok(())
}
pub async fn send_payload(&mut self, payload: Payload) -> io::Result<()> {
match payload {
Payload::Request { chan, value } => {
self.pending_requests.insert(value.id.clone(), chan);
let json = serde_json::to_string(&value)?;
self.send(json).await
}
Payload::Notification(value) => {
let json = serde_json::to_string(&value)?;
self.send(json).await
}
Payload::Response(error) => {
let json = serde_json::to_string(&error)?;
self.send(json).await
}
}
}
pub async fn send(&mut self, request: String) -> io::Result<()> {
info!("-> {}", request);
// send the headers
self.writer
.write_all(format!("Content-Length: {}\r\n\r\n", request.len()).as_bytes())
.await?;
// send the body
self.writer.write_all(request.as_bytes()).await?;
self.writer.flush().await?;
Ok(())
}
async fn recv_msg(&mut self, msg: Message) -> anyhow::Result<()> {
match msg {
Message::Output(output) => self.recv_response(output).await?,
Message::Call(call) => {
self.incoming.send(call).await?;
// let notification = Notification::parse(&method, params);
}
};
Ok(())
}
async fn recv_response(&mut self, output: jsonrpc::Output) -> io::Result<()> {
let (id, result) = match output {
jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => {
info!("<- {}", result);
(id, Ok(result))
}
jsonrpc::Output::Failure(jsonrpc::Failure { id, error, .. }) => {
error!("<- {}", error);
(id, Err(error.into()))
}
};
let tx = self
.pending_requests
.remove(&id)
.expect("pending_request with id not found!");
match tx.send(result).await {
Ok(_) => (),
Err(_) => error!(
"Tried sending response into a closed channel (id={:?}), original request likely timed out",
id
),
};
Ok(())
}
pub async fn duplex(mut self) {
use futures_util::{select, FutureExt};
loop {
select! {
// client -> server
msg = self.outgoing.next().fuse() => {
if msg.is_none() {
break;
}
let msg = msg.unwrap();
self.send_payload(msg).await.unwrap();
}
// server <- client
msg = Self::recv(&mut self.reader, &mut self.headers).fuse() => {
if msg.is_err() {
error!("err: <- {:?}", msg);
break;
}
let msg = msg.unwrap();
self.recv_msg(msg).await.unwrap();
}
_msg = Self::err(&mut self.stderr).fuse() => {}
}
}
}
}
|
