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@ -1,15 +1,9 @@
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use std::collections::HashMap;
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use std::io;
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use log::{error, info};
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use crate::Error;
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type Result<T> = core::result::Result<T, Error>;
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use crate::Result;
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use jsonrpc_core as jsonrpc;
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use log::{error, info};
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use serde::{Deserialize, Serialize};
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use serde_json::Value;
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use std::collections::HashMap;
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use tokio::{
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io::{AsyncBufRead, AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader, BufWriter},
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process::{ChildStderr, ChildStdin, ChildStdout},
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@ -26,12 +20,11 @@ pub enum Payload {
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Response(jsonrpc::Output),
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}
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use serde::{Deserialize, Serialize};
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/// A type representing all possible values sent from the server to the client.
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#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
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#[serde(deny_unknown_fields)]
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#[serde(untagged)]
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enum Message {
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enum ServerMessage {
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/// A regular JSON-RPC request output (single response).
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Output(jsonrpc::Output),
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/// A JSON-RPC request or notification.
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@ -39,34 +32,32 @@ enum Message {
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}
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pub struct Transport {
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incoming: UnboundedSender<jsonrpc::Call>,
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outgoing: UnboundedReceiver<Payload>,
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client_tx: UnboundedSender<jsonrpc::Call>,
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client_rx: UnboundedReceiver<Payload>,
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pending_requests: HashMap<jsonrpc::Id, Sender<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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stderr: BufReader<ChildStderr>,
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server_stdin: BufWriter<ChildStdin>,
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server_stdout: BufReader<ChildStdout>,
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server_stderr: BufReader<ChildStderr>,
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}
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impl Transport {
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pub fn start(
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reader: BufReader<ChildStdout>,
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writer: BufWriter<ChildStdin>,
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stderr: BufReader<ChildStderr>,
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server_stdout: BufReader<ChildStdout>,
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server_stdin: BufWriter<ChildStdin>,
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server_stderr: BufReader<ChildStderr>,
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) -> (UnboundedReceiver<jsonrpc::Call>, UnboundedSender<Payload>) {
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let (incoming, rx) = unbounded_channel();
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let (tx, outgoing) = unbounded_channel();
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let (client_tx, rx) = unbounded_channel();
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let (tx, client_rx) = unbounded_channel();
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let transport = Self {
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reader,
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writer,
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stderr,
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incoming,
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outgoing,
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server_stdout,
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server_stdin,
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server_stderr,
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client_tx,
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client_rx,
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pending_requests: HashMap::default(),
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headers: HashMap::default(),
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};
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tokio::spawn(transport.duplex());
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@ -74,105 +65,104 @@ impl Transport {
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(rx, tx)
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}
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async fn recv(
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async fn recv_server_message(
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reader: &mut (impl AsyncBufRead + Unpin + Send),
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headers: &mut HashMap<String, String>,
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) -> core::result::Result<Message, std::io::Error> {
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// read headers
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buffer: &mut String,
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) -> Result<ServerMessage> {
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let mut content_length = None;
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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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buffer.truncate(0);
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reader.read_line(buffer).await?;
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let header = buffer.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(std::io::Error::new(
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std::io::ErrorKind::Other,
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"Failed to parse header",
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));
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let mut parts = header.split(": ");
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match (parts.next(), parts.next(), parts.next()) {
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(Some("Content-Length"), Some(value), None) => {
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content_length = Some(value.parse().unwrap());
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}
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(Some(_), Some(_), None) => {}
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_ => {
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return Err(std::io::Error::new(
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std::io::ErrorKind::Other,
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"Failed to parse header",
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)
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.into());
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}
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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 content_length = content_length.unwrap();
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//TODO: reuse vector
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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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info!("<- {}", msg);
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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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let output: serde_json::Result<ServerMessage> = serde_json::from_str(&msg);
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Ok(output?)
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}
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async fn err(
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async fn recv_server_error(
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err: &mut (impl AsyncBufRead + Unpin + Send),
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) -> core::result::Result<(), std::io::Error> {
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let mut line = String::new();
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err.read_line(&mut line).await?;
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error!("err <- {}", line);
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buffer: &mut String,
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) -> Result<()> {
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buffer.truncate(0);
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err.read_line(buffer).await?;
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error!("err <- {}", buffer);
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Ok(())
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}
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pub async fn send_payload(&mut self, payload: Payload) -> io::Result<()> {
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match payload {
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async fn send_payload_to_server(&mut self, payload: Payload) -> Result<()> {
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//TODO: reuse string
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let json = 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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serde_json::to_string(&value)?
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}
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Payload::Response(error) => {
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let json = serde_json::to_string(&error)?;
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self.send(json).await
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}
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}
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Payload::Notification(value) => serde_json::to_string(&value)?,
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Payload::Response(error) => serde_json::to_string(&error)?,
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};
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self.send_string_to_server(json).await
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}
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pub async fn send(&mut self, request: String) -> io::Result<()> {
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async fn send_string_to_server(&mut self, request: String) -> Result<()> {
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info!("-> {}", request);
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// send the headers
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self.writer
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self.server_stdin
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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.server_stdin.write_all(request.as_bytes()).await?;
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self.writer.flush().await?;
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self.server_stdin.flush().await?;
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Ok(())
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}
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async fn recv_msg(&mut self, msg: Message) -> anyhow::Result<()> {
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async fn process_server_message(&mut self, msg: ServerMessage) -> Result<()> {
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match msg {
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Message::Output(output) => self.recv_response(output).await?,
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Message::Call(call) => {
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self.incoming.send(call).unwrap();
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ServerMessage::Output(output) => self.process_request_response(output).await?,
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ServerMessage::Call(call) => {
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self.client_tx.send(call).unwrap();
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// let notification = Notification::parse(&method, params);
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}
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};
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Ok(())
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}
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async fn recv_response(&mut self, output: jsonrpc::Output) -> io::Result<()> {
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async fn process_request_response(&mut self, output: jsonrpc::Output) -> Result<()> {
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let (id, result) = match output {
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jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => {
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info!("<- {}", result);
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@ -200,29 +190,33 @@ impl Transport {
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Ok(())
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}
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pub async fn duplex(mut self) {
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async fn duplex(mut self) {
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let mut recv_buffer = String::new();
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let mut err_buffer = String::new();
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loop {
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tokio::select! {
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// client -> server
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msg = self.outgoing.recv() => {
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if msg.is_none() {
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break;
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msg = self.client_rx.recv() => {
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match msg {
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Some(msg) => {
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self.send_payload_to_server(msg).await.unwrap()
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},
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None => 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) => {
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if msg.is_err() {
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error!("err: <- {:?}", msg);
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break;
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// server -> client
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msg = Self::recv_server_message(&mut self.server_stdout, &mut recv_buffer) => {
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match msg {
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Ok(msg) => {
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self.process_server_message(msg).await.unwrap();
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}
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Err(_) => {
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error!("err: <- {:?}", msg);
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break;
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},
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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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_msg = Self::err(&mut self.stderr) => {}
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_msg = Self::recv_server_error(&mut self.server_stderr, &mut err_buffer) => {}
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}
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}
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}
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Egor Karavaev
4 years ago
committed by
Blaž Hrastnik