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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
use std::sync::{Arc, RwLock};
use rquickjs::{
class::{Trace, Tracer},
prelude::{Func, Opt, This},
Class, Ctx, Function, Result, Value,
};
use tokio::{
io::{AsyncWrite, AsyncWriteExt},
sync::{
broadcast::{self, Sender},
mpsc::{self, UnboundedReceiver, UnboundedSender},
oneshot::Receiver,
},
};
use crate::{
modules::events::{Emitter, EventEmitter, EventList},
utils::result::ResultExt,
// vm::{CtxExtension, ErrorExtensions},
};
use super::SteamEvents;
pub struct WritableStreamInner<'js> {
emitter: EventEmitter<'js>,
command_tx: UnboundedSender<WriteCommand<'js>>,
command_rx: Option<UnboundedReceiver<WriteCommand<'js>>>,
is_finished: bool,
#[allow(dead_code)]
errored: bool,
emit_close: bool,
is_destroyed: bool,
destroy_tx: Sender<Option<Value<'js>>>,
}
impl<'js> WritableStreamInner<'js> {
pub fn new(emitter: EventEmitter<'js>, emit_close: bool) -> Self {
let (tx, rx) = mpsc::unbounded_channel();
let (destroy_tx, _) = broadcast::channel::<Option<Value<'js>>>(1);
Self {
command_tx: tx,
command_rx: Some(rx),
emitter,
is_finished: false,
is_destroyed: false,
destroy_tx,
emit_close,
errored: false,
}
}
}
#[derive(Debug)]
#[allow(dead_code)]
pub enum WriteCommand<'js> {
End,
Write(Vec<u8>, Option<Function<'js>>, bool),
Flush,
}
#[rquickjs::class]
#[derive(rquickjs::class::Trace)]
pub struct DefaultWritableStream<'js> {
inner: WritableStreamInner<'js>,
}
impl<'js> Trace<'js> for WritableStreamInner<'js> {
fn trace<'a>(&self, tracer: Tracer<'a, 'js>) {
self.emitter.trace(tracer);
}
}
impl<'js> Emitter<'js> for DefaultWritableStream<'js> {
fn get_event_list(&self) -> Arc<RwLock<EventList<'js>>> {
self.inner.emitter.get_event_list()
}
}
impl<'js> DefaultWritableStream<'js> {
fn with_emitter(ctx: Ctx<'js>, emitter: EventEmitter<'js>) -> Result<Class<'js, Self>> {
Class::instance(
ctx,
Self {
inner: WritableStreamInner::new(emitter, true),
},
)
}
pub fn new(ctx: Ctx<'js>) -> Result<Class<'js, Self>> {
Self::with_emitter(ctx, EventEmitter::new())
}
}
impl<'js> WritableStream<'js> for DefaultWritableStream<'js> {
fn inner_mut(&mut self) -> &mut WritableStreamInner<'js> {
&mut self.inner
}
fn inner(&self) -> &WritableStreamInner<'js> {
&self.inner
}
}
pub trait WritableStream<'js>
where
Self: Emitter<'js> + SteamEvents<'js>,
{
fn inner_mut(&mut self) -> &mut WritableStreamInner<'js>;
fn inner(&self) -> &WritableStreamInner<'js>;
fn add_writable_stream_prototype(ctx: &Ctx<'js>) -> Result<()> {
let proto = Class::<Self>::prototype(ctx.clone())
.or_throw_msg(ctx, &format!("Prototype for {} not found", Self::NAME))?;
proto.set("write", Func::from(Self::write))?;
proto.set("end", Func::from(Self::end))?;
Ok(())
}
fn destroy(
this: This<Class<'js, Self>>,
_ctx: Ctx<'js>,
error: Opt<Value<'js>>,
) -> Class<'js, Self> {
if !this.borrow().inner().is_finished {
let mut borrow = this.borrow_mut();
let inner = borrow.inner_mut();
inner.is_finished = true;
inner.is_destroyed = true;
let tx = inner.destroy_tx.clone();
drop(borrow);
//it doesn't matter if channel is closed because then writable is already closed
let _ = tx.send(error.0);
}
this.0
}
fn end(this: This<Class<'js, Self>>) -> Class<'js, Self> {
if !this.borrow().inner().is_finished {
let mut borrow = this.borrow_mut();
let inner = borrow.inner_mut();
inner.is_finished = true;
let tx = inner.command_tx.clone();
drop(borrow);
//it doesn't matter if channel is closed because then writable is already closed
let _ = tx.send(WriteCommand::End);
}
this.0
}
#[allow(dead_code)]
fn flush(this: Class<'js, Self>, ctx: &Ctx<'js>) -> Result<()> {
let _ = this
.borrow()
.inner()
.command_tx
.send(WriteCommand::Flush)
.or_throw(ctx);
Ok(())
}
fn write_flushed(
this: This<Class<'js, Self>>,
ctx: Ctx<'js>,
value: Value<'js>,
cb: Opt<Function<'js>>,
) -> Result<()> {
Self::do_write(this, ctx, value, cb, true)
}
fn write(
this: This<Class<'js, Self>>,
ctx: Ctx<'js>,
value: Value<'js>,
cb: Opt<Function<'js>>,
) -> Result<()> {
Self::do_write(this, ctx, value, cb, false)
}
fn do_write(
this: This<Class<'js, Self>>,
ctx: Ctx<'js>,
value: Value<'js>,
cb: Opt<Function<'js>>,
flush: bool,
) -> Result<()> {
// let bytes = get_bytes(&ctx, value)?;
// let callback = cb.0;
// if this
// .borrow()
// .inner()
// .command_tx
// .send(WriteCommand::Write(bytes, callback.clone(), flush))
// .is_err()
// {
// if let Some(cb) = callback {
// let err =
// Exception::throw_message(&ctx, "This socket has been ended by the other party")
// .into_value(&ctx)?;
// () = cb.call((err,))?;
// }
// }
Ok(())
}
fn process<T: AsyncWrite + 'js + Unpin>(
this: Class<'js, Self>,
ctx: &Ctx<'js>,
writable: T,
) -> Result<Receiver<bool>> {
let mut borrow = this.borrow_mut();
let inner = borrow.inner_mut();
let is_ended = inner.is_finished;
let is_destroyed = inner.is_destroyed;
let emit_close = inner.emit_close;
let command_rx = inner
.command_rx
.take()
.expect("rx from writable process already taken!");
let destroy_rx = inner.destroy_tx.subscribe();
todo!();
// let mut error_value = None;
// drop(borrow);
// let ctx2 = ctx.clone();
// ctx.spawn_exit(async move {
// let ctx3 = ctx2.clone();
// let this2 = this.clone();
// let write_function = async move {
// let mut writer = BufWriter::new(writable);
// if !is_ended && !is_destroyed {
// loop {
// tokio::select! {
// command = command_rx.recv() => {
// match command {
// Some(WriteCommand::Write(data, cb, flush)) => {
// writer.write_all(&data).await.or_throw(&ctx3)?;
// if flush {
// writer.flush().await.or_throw(&ctx3)?;
// }
// if let Some(cb) = cb {
// () = cb.call(())?;
// }
// },
// Some(WriteCommand::End) => {
// writer.shutdown().await.or_throw(&ctx3)?;
// break;
// },
// Some(WriteCommand::Flush) => writer.flush().await.or_throw(&ctx3)?,
// None => break,
// }
// },
// error = destroy_rx.recv() => {
// set_destroyed_and_error(&mut is_destroyed, &mut error_value, error);
// break;
// }
// }
// }
// }
// drop(writer);
// if !is_destroyed {
// Self::emit_str(This(this2), &ctx3, "finish", vec![], false)?;
// }
// if let Some(error_value) = error_value{
// return Err(ctx3.throw(error_value));
// }
// Ok::<_, Error>(())
// }
// .await;
// let had_error = write_function.emit_error(&ctx2, this.clone())?;
// if emit_close {
// Self::emit_close(this,&ctx2,had_error)?;
// }
// Ok::<_, Error>(had_error)
// })
}
}