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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::Future;
use futures::future::FutureExt;
use futures::future::MaybeDone;
use futures::task::noop_waker;
use std::cell::RefCell;
use std::option::Option;
use std::pin::Pin;
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))
.boxed_local();
// SAFETY: this 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::pending(ctx, promise_id, fut))
});
}
#[inline]
pub fn map_async_op1<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = Result<R, Error>> + 'static,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
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))
.boxed_local();
MaybeDone::Future(fut)
}
#[inline]
pub fn map_async_op2<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = R> + 'static,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
let fut = op.map(|result| OpResult::Ok(result.into())).boxed_local();
MaybeDone::Future(fut)
}
#[inline]
pub fn map_async_op3<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = Result<R, Error>> + 'static, Error>,
) -> MaybeDone<Pin<Box<dyn 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) => MaybeDone::Done(OpResult::Err(OpError::new(get_class, err))),
Ok(fut) => MaybeDone::Future(
fut
.map(|result| crate::_ops::to_op_result(get_class, result))
.boxed_local(),
),
}
}
#[inline]
pub fn map_async_op4<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = R> + 'static, Error>,
) -> MaybeDone<Pin<Box<dyn 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) => MaybeDone::Done(OpResult::Err(OpError::new(get_class, err))),
Ok(fut) => MaybeDone::Future(
fut.map(|result| OpResult::Ok(result.into())).boxed_local(),
),
}
}
pub fn queue_async_op<'s>(
ctx: &OpCtx,
scope: &'s mut v8::HandleScope,
deferred: bool,
promise_id: PromiseId,
mut op: MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>>,
) -> 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())
// );
// All ops are polled immediately
let waker = noop_waker();
let mut cx = Context::from_waker(&waker);
// Note that MaybeDone returns () from the future
let op_call = match op.poll_unpin(&mut cx) {
Poll::Pending => {
let MaybeDone::Future(fut) = op else {
unreachable!()
};
OpCall::pending(ctx, promise_id, fut)
}
Poll::Ready(_) => {
let mut op_result = Pin::new(&mut op).take_output().unwrap();
// If the op is ready and is not marked as deferred we can immediately return
// the result.
if !deferred {
ctx.state.borrow_mut().tracker.track_async_completed(ctx.id);
return Some(op_result.to_v8(scope).unwrap());
}
OpCall::ready(ctx, promise_id, op_result)
}
};
// Otherwise we will push it to the `pending_ops` and let it be polled again
// or resolved on the next tick of the event loop.
ctx
.context_state
.borrow_mut()
.pending_ops
// SAFETY: this this is guaranteed to be running on a current-thread executor
.spawn(unsafe { crate::task::MaskFutureAsSend::new(op_call) });
None
}
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