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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use deno_core::anyhow::anyhow;
use deno_core::error::AnyError;
use deno_core::serde_json::Value;
use std::cell::RefCell;
use tokio::sync::mpsc::channel;
use tokio::sync::mpsc::unbounded_channel;
use tokio::sync::mpsc::Receiver;
use tokio::sync::mpsc::Sender;
use tokio::sync::mpsc::UnboundedReceiver;
use tokio::sync::mpsc::UnboundedSender;
/// Rustyline uses synchronous methods in its interfaces, but we need to call
/// async methods. To get around this, we communicate with async code by using
/// a channel and blocking on the result.
pub fn rustyline_channel(
) -> (RustylineSyncMessageSender, RustylineSyncMessageHandler) {
let (message_tx, message_rx) = channel(1);
let (response_tx, response_rx) = unbounded_channel();
(
RustylineSyncMessageSender {
message_tx,
response_rx: RefCell::new(response_rx),
},
RustylineSyncMessageHandler {
response_tx,
message_rx,
},
)
}
pub type RustylineSyncMessage = (String, Option<Value>);
pub type RustylineSyncResponse = Result<Value, AnyError>;
pub struct RustylineSyncMessageSender {
message_tx: Sender<RustylineSyncMessage>,
response_rx: RefCell<UnboundedReceiver<RustylineSyncResponse>>,
}
impl RustylineSyncMessageSender {
pub fn post_message(
&self,
method: &str,
params: Option<Value>,
) -> Result<Value, AnyError> {
if let Err(err) =
self.message_tx.blocking_send((method.to_string(), params))
{
Err(anyhow!("{}", err))
} else {
self.response_rx.borrow_mut().blocking_recv().unwrap()
}
}
}
pub struct RustylineSyncMessageHandler {
message_rx: Receiver<RustylineSyncMessage>,
response_tx: UnboundedSender<RustylineSyncResponse>,
}
impl RustylineSyncMessageHandler {
pub async fn recv(&mut self) -> Option<RustylineSyncMessage> {
self.message_rx.recv().await
}
pub fn send(&self, response: RustylineSyncResponse) -> Result<(), AnyError> {
self
.response_tx
.send(response)
.map_err(|err| anyhow!("{}", err))
}
}
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