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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use deno_core::error::AnyError;
use deno_core::serde_json::Value;
use deno_core::BufVec;
use deno_core::OpState;
use deno_core::ZeroCopyBuf;
use std::cell::RefCell;
use std::rc::Rc;
#[cfg(unix)]
use deno_core::error::bad_resource_id;
#[cfg(unix)]
use deno_core::futures::future::poll_fn;
#[cfg(unix)]
use deno_core::serde_json;
#[cfg(unix)]
use deno_core::serde_json::json;
#[cfg(unix)]
use serde::Deserialize;
#[cfg(unix)]
use std::task::Waker;
#[cfg(unix)]
use tokio::signal::unix::{signal, Signal, SignalKind};
pub fn init(rt: &mut deno_core::JsRuntime) {
super::reg_json_sync(rt, "op_signal_bind", op_signal_bind);
super::reg_json_sync(rt, "op_signal_unbind", op_signal_unbind);
super::reg_json_async(rt, "op_signal_poll", op_signal_poll);
}
#[cfg(unix)]
/// The resource for signal stream.
/// The second element is the waker of polling future.
pub struct SignalStreamResource(pub Signal, pub Option<Waker>);
#[cfg(unix)]
#[derive(Deserialize)]
struct BindSignalArgs {
signo: i32,
}
#[cfg(unix)]
#[derive(Deserialize)]
struct SignalArgs {
rid: i32,
}
#[cfg(unix)]
fn op_signal_bind(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
super::check_unstable(state, "Deno.signal");
let args: BindSignalArgs = serde_json::from_value(args)?;
let rid = state.resource_table.add(
"signal",
Box::new(SignalStreamResource(
signal(SignalKind::from_raw(args.signo)).expect(""),
None,
)),
);
Ok(json!({
"rid": rid,
}))
}
#[cfg(unix)]
async fn op_signal_poll(
state: Rc<RefCell<OpState>>,
args: Value,
_zero_copy: BufVec,
) -> Result<Value, AnyError> {
super::check_unstable2(&state, "Deno.signal");
let args: SignalArgs = serde_json::from_value(args)?;
let rid = args.rid as u32;
let future = poll_fn(move |cx| {
let mut state = state.borrow_mut();
if let Some(mut signal) =
state.resource_table.get_mut::<SignalStreamResource>(rid)
{
signal.1 = Some(cx.waker().clone());
return signal.0.poll_recv(cx);
}
std::task::Poll::Ready(None)
});
let result = future.await;
Ok(json!({ "done": result.is_none() }))
}
#[cfg(unix)]
pub fn op_signal_unbind(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
super::check_unstable(state, "Deno.signal");
let args: SignalArgs = serde_json::from_value(args)?;
let rid = args.rid as u32;
let resource = state.resource_table.get_mut::<SignalStreamResource>(rid);
if let Some(signal) = resource {
if let Some(waker) = &signal.1 {
// Wakes up the pending poll if exists.
// This prevents the poll future from getting stuck forever.
waker.clone().wake();
}
}
state
.resource_table
.close(rid)
.ok_or_else(bad_resource_id)?;
Ok(json!({}))
}
#[cfg(not(unix))]
pub fn op_signal_bind(
_state: &mut OpState,
_args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
unimplemented!();
}
#[cfg(not(unix))]
fn op_signal_unbind(
_state: &mut OpState,
_args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
unimplemented!();
}
#[cfg(not(unix))]
async fn op_signal_poll(
_state: Rc<RefCell<OpState>>,
_args: Value,
_zero_copy: BufVec,
) -> Result<Value, AnyError> {
unimplemented!();
}
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