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81 lines
2.3 KiB
Rust
81 lines
2.3 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use crate::web_worker::WebWorkerInternalHandle;
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use crate::web_worker::WorkerControlEvent;
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use deno_core::error::generic_error;
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use deno_core::error::AnyError;
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use deno_core::op_async;
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use deno_core::op_sync;
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use deno_core::CancelFuture;
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use deno_core::Extension;
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use deno_core::OpState;
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use deno_web::JsMessageData;
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use std::cell::RefCell;
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use std::rc::Rc;
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pub fn init() -> Extension {
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Extension::builder()
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.ops(vec![
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("op_worker_post_message", op_sync(op_worker_post_message)),
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("op_worker_recv_message", op_async(op_worker_recv_message)),
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// Notify host that guest worker closes.
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("op_worker_close", op_sync(op_worker_close)),
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// Notify host that guest worker has unhandled error.
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(
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"op_worker_unhandled_error",
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op_sync(op_worker_unhandled_error),
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),
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])
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.build()
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}
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fn op_worker_post_message(
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state: &mut OpState,
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data: JsMessageData,
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_: (),
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) -> Result<(), AnyError> {
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let handle = state.borrow::<WebWorkerInternalHandle>().clone();
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handle.port.send(state, data)?;
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Ok(())
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}
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async fn op_worker_recv_message(
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state: Rc<RefCell<OpState>>,
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_: (),
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_: (),
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) -> Result<Option<JsMessageData>, AnyError> {
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let handle = {
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let state = state.borrow();
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state.borrow::<WebWorkerInternalHandle>().clone()
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};
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handle
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.port
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.recv(state.clone())
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.or_cancel(handle.cancel)
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.await?
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}
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fn op_worker_close(state: &mut OpState, _: (), _: ()) -> Result<(), AnyError> {
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// Notify parent that we're finished
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let mut handle = state.borrow_mut::<WebWorkerInternalHandle>().clone();
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handle.terminate();
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Ok(())
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}
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/// A worker that encounters an uncaught error will pass this error
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/// to its parent worker using this op. The parent worker will use
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/// this same op to pass the error to its own parent (in case
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/// `e.preventDefault()` was not called in `worker.onerror`). This
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/// is done until the error reaches the root/ main worker.
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fn op_worker_unhandled_error(
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state: &mut OpState,
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message: String,
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_: (),
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) -> Result<(), AnyError> {
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let sender = state.borrow::<WebWorkerInternalHandle>().clone();
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sender
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.post_event(WorkerControlEvent::Error(generic_error(message)))
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.expect("Failed to propagate error event to parent worker");
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Ok(())
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}
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