mirror of
https://github.com/denoland/deno.git
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135 lines
3.2 KiB
Rust
135 lines
3.2 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use super::dispatch_json::{JsonOp, Value};
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use crate::op_error::OpError;
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use crate::state::State;
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use deno_core::*;
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#[cfg(unix)]
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use super::dispatch_json::Deserialize;
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#[cfg(unix)]
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use futures::future::{poll_fn, FutureExt};
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#[cfg(unix)]
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use serde_json;
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#[cfg(unix)]
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use std::task::Waker;
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#[cfg(unix)]
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use tokio::signal::unix::{signal, Signal, SignalKind};
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pub fn init(i: &mut Isolate, s: &State) {
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i.register_op("op_signal_bind", s.stateful_json_op(op_signal_bind));
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i.register_op("op_signal_unbind", s.stateful_json_op(op_signal_unbind));
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i.register_op("op_signal_poll", s.stateful_json_op(op_signal_poll));
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}
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#[cfg(unix)]
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/// The resource for signal stream.
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/// The second element is the waker of polling future.
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pub struct SignalStreamResource(pub Signal, pub Option<Waker>);
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#[cfg(unix)]
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#[derive(Deserialize)]
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struct BindSignalArgs {
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signo: i32,
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}
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#[cfg(unix)]
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#[derive(Deserialize)]
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struct SignalArgs {
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rid: i32,
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}
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#[cfg(unix)]
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fn op_signal_bind(
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state: &State,
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args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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let args: BindSignalArgs = serde_json::from_value(args)?;
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let mut state = state.borrow_mut();
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let rid = state.resource_table.add(
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"signal",
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Box::new(SignalStreamResource(
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signal(SignalKind::from_raw(args.signo)).expect(""),
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None,
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)),
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);
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Ok(JsonOp::Sync(json!({
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"rid": rid,
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})))
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}
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#[cfg(unix)]
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fn op_signal_poll(
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state: &State,
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args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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let args: SignalArgs = serde_json::from_value(args)?;
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let rid = args.rid as u32;
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let state_ = state.clone();
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let future = poll_fn(move |cx| {
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let mut state = state_.borrow_mut();
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if let Some(mut signal) =
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state.resource_table.get_mut::<SignalStreamResource>(rid)
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{
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signal.1 = Some(cx.waker().clone());
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return signal.0.poll_recv(cx);
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}
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std::task::Poll::Ready(None)
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})
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.then(|result| async move { Ok(json!({ "done": result.is_none() })) });
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Ok(JsonOp::AsyncUnref(future.boxed_local()))
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}
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#[cfg(unix)]
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pub fn op_signal_unbind(
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state: &State,
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args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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let args: SignalArgs = serde_json::from_value(args)?;
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let rid = args.rid as u32;
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let mut state = state.borrow_mut();
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let resource = state.resource_table.get::<SignalStreamResource>(rid);
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if let Some(signal) = resource {
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if let Some(waker) = &signal.1 {
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// Wakes up the pending poll if exists.
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// This prevents the poll future from getting stuck forever.
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waker.clone().wake();
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}
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}
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state
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.resource_table
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.close(rid)
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.ok_or_else(OpError::bad_resource)?;
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Ok(JsonOp::Sync(json!({})))
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}
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#[cfg(not(unix))]
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pub fn op_signal_bind(
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_state: &State,
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_args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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unimplemented!();
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}
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#[cfg(not(unix))]
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fn op_signal_unbind(
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_state: &State,
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_args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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unimplemented!();
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}
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#[cfg(not(unix))]
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fn op_signal_poll(
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_state: &State,
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_args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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unimplemented!();
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}
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