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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use crate::ops::*;
use crate::OpResult;
use crate::PromiseId;
use anyhow::Error;
use futures::future::Either;
use futures::future::Future;
use futures::future::FutureExt;
use futures::task::noop_waker_ref;
use std::cell::RefCell;
use std::future::ready;
use std::option::Option;
use std::task::Context;
use std::task::Poll;
#[inline]
pub fn queue_fast_async_op<R: serde::Serialize + 'static>(
ctx: &OpCtx,
promise_id: PromiseId,
op: impl Future<Output = Result<R, Error>> + 'static,
) {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
let fut = op.map(|result| crate::_ops::to_op_result(get_class, result));
// SAFETY: this is guaranteed to be running on a current-thread executor
ctx.context_state.borrow_mut().pending_ops.spawn(unsafe {
crate::task::MaskFutureAsSend::new(OpCall::new(ctx, promise_id, fut))
});
}
#[inline]
pub fn map_async_op1<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = Result<R, Error>> + 'static,
) -> impl Future<Output = OpResult> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
op.map(|res| crate::_ops::to_op_result(get_class, res))
}
#[inline]
pub fn map_async_op2<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = R> + 'static,
) -> impl Future<Output = OpResult> {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
op.map(|res| OpResult::Ok(res.into()))
}
#[inline]
pub fn map_async_op3<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = Result<R, Error>> + 'static, Error>,
) -> impl Future<Output = OpResult> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
match op {
Err(err) => {
Either::Left(ready(OpResult::Err(OpError::new(get_class, err))))
}
Ok(fut) => {
Either::Right(fut.map(|res| crate::_ops::to_op_result(get_class, res)))
}
}
}
#[inline]
pub fn map_async_op4<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = R> + 'static, Error>,
) -> impl Future<Output = OpResult> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
match op {
Err(err) => {
Either::Left(ready(OpResult::Err(OpError::new(get_class, err))))
}
Ok(fut) => Either::Right(fut.map(|r| OpResult::Ok(r.into()))),
}
}
pub fn queue_async_op<'s>(
ctx: &OpCtx,
scope: &'s mut v8::HandleScope,
deferred: bool,
promise_id: PromiseId,
op: impl Future<Output = OpResult> + 'static,
) -> Option<v8::Local<'s, v8::Value>> {
// An op's realm (as given by `OpCtx::realm_idx`) must match the realm in
// which it is invoked. Otherwise, we might have cross-realm object exposure.
// deno_core doesn't currently support such exposure, even though embedders
// can cause them, so we panic in debug mode (since the check is expensive).
// TODO(mmastrac): Restore this
// debug_assert_eq!(
// runtime_state.borrow().context(ctx.realm_idx as usize, scope),
// Some(scope.get_current_context())
// );
let id = ctx.id;
// TODO(mmastrac): We have to poll every future here because that assumption is baked into a large number
// of ops. If we can figure out a way around this, we can remove this call to boxed_local and save a malloc per future.
let mut pinned = op.map(move |res| (promise_id, id, res)).boxed_local();
match pinned.poll_unpin(&mut Context::from_waker(noop_waker_ref())) {
Poll::Pending => {}
Poll::Ready(mut res) => {
if deferred {
ctx
.context_state
.borrow_mut()
.pending_ops
// SAFETY: this is guaranteed to be running on a current-thread executor
.spawn(unsafe { crate::task::MaskFutureAsSend::new(ready(res)) });
return None;
} else {
ctx.state.borrow_mut().tracker.track_async_completed(ctx.id);
return Some(res.2.to_v8(scope).unwrap());
}
}
}
ctx
.context_state
.borrow_mut()
.pending_ops
// SAFETY: this is guaranteed to be running on a current-thread executor
.spawn(unsafe { crate::task::MaskFutureAsSend::new(pinned) });
None
}
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