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https://github.com/denoland/deno.git
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c7c7677825
This commit fixes implementation of top level await in "deno_core". Previously promise returned from module execution was ignored causing to execute modules out-of-order. With this commit promise returned from module execution is stored on "JsRuntime" and event loop is polled until the promise resolves.
377 lines
11 KiB
Rust
377 lines
11 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use crate::fmt_errors::JsError;
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use crate::global_state::GlobalState;
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use crate::ops::io::get_stdio;
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use crate::permissions::Permissions;
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use crate::tokio_util::create_basic_runtime;
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use crate::worker::WebWorker;
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use crate::worker::WebWorkerHandle;
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use crate::worker::WorkerEvent;
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use deno_core::error::AnyError;
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use deno_core::futures::future::FutureExt;
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use deno_core::serde_json;
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use deno_core::serde_json::json;
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use deno_core::serde_json::Value;
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use deno_core::BufVec;
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use deno_core::ModuleSpecifier;
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use deno_core::OpState;
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use deno_core::ZeroCopyBuf;
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use serde::Deserialize;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::convert::From;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::thread::JoinHandle;
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pub fn init(rt: &mut deno_core::JsRuntime) {
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{
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let op_state = rt.op_state();
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let mut state = op_state.borrow_mut();
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state.put::<WorkersTable>(WorkersTable::default());
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state.put::<WorkerId>(WorkerId::default());
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}
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super::reg_json_sync(rt, "op_create_worker", op_create_worker);
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super::reg_json_sync(
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rt,
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"op_host_terminate_worker",
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op_host_terminate_worker,
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);
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super::reg_json_sync(rt, "op_host_post_message", op_host_post_message);
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super::reg_json_async(rt, "op_host_get_message", op_host_get_message);
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}
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pub type WorkersTable = HashMap<u32, (JoinHandle<()>, WebWorkerHandle)>;
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pub type WorkerId = u32;
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fn create_web_worker(
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worker_id: u32,
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name: String,
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global_state: &Arc<GlobalState>,
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permissions: Permissions,
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specifier: ModuleSpecifier,
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has_deno_namespace: bool,
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) -> Result<WebWorker, AnyError> {
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let mut worker = WebWorker::new(
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name.clone(),
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permissions,
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specifier,
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global_state.clone(),
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has_deno_namespace,
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);
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if has_deno_namespace {
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let state = worker.isolate.op_state();
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let mut state = state.borrow_mut();
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let (stdin, stdout, stderr) = get_stdio();
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if let Some(stream) = stdin {
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state.resource_table.add("stdin", Box::new(stream));
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}
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if let Some(stream) = stdout {
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state.resource_table.add("stdout", Box::new(stream));
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}
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if let Some(stream) = stderr {
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state.resource_table.add("stderr", Box::new(stream));
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}
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}
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// Instead of using name for log we use `worker-${id}` because
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// WebWorkers can have empty string as name.
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let script = format!(
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"bootstrap.workerRuntime(\"{}\", {}, \"worker-{}\")",
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name, worker.has_deno_namespace, worker_id
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);
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worker.execute(&script)?;
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Ok(worker)
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}
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// TODO(bartlomieju): check if order of actions is aligned to Worker spec
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fn run_worker_thread(
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worker_id: u32,
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name: String,
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global_state: &Arc<GlobalState>,
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permissions: Permissions,
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specifier: ModuleSpecifier,
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has_deno_namespace: bool,
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maybe_source_code: Option<String>,
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) -> Result<(JoinHandle<()>, WebWorkerHandle), AnyError> {
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let global_state = global_state.clone();
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let (handle_sender, handle_receiver) =
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std::sync::mpsc::sync_channel::<Result<WebWorkerHandle, AnyError>>(1);
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let builder =
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std::thread::Builder::new().name(format!("deno-worker-{}", worker_id));
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let join_handle = builder.spawn(move || {
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// Any error inside this block is terminal:
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// - JS worker is useless - meaning it throws an exception and can't do anything else,
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// all action done upon it should be noops
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// - newly spawned thread exits
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let result = create_web_worker(
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worker_id,
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name,
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&global_state,
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permissions,
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specifier.clone(),
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has_deno_namespace,
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);
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if let Err(err) = result {
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handle_sender.send(Err(err)).unwrap();
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return;
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}
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let mut worker = result.unwrap();
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let name = worker.name.to_string();
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// Send thread safe handle to newly created worker to host thread
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handle_sender.send(Ok(worker.thread_safe_handle())).unwrap();
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drop(handle_sender);
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// At this point the only method of communication with host
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// is using `worker.internal_channels`.
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//
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// Host can already push messages and interact with worker.
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//
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// Next steps:
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// - create tokio runtime
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// - load provided module or code
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// - start driving worker's event loop
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let mut rt = create_basic_runtime();
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// TODO: run with using select with terminate
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// Execute provided source code immediately
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let result = if let Some(source_code) = maybe_source_code {
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worker.execute(&source_code)
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} else {
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// TODO(bartlomieju): add "type": "classic", ie. ability to load
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// script instead of module
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let load_future = worker.execute_module(&specifier).boxed_local();
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rt.block_on(load_future)
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};
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if let Err(e) = result {
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let mut sender = worker.internal_channels.sender.clone();
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// If sender is closed it means that worker has already been closed from
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// within using "globalThis.close()"
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if sender.is_closed() {
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return;
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}
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sender
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.try_send(WorkerEvent::TerminalError(e))
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.expect("Failed to post message to host");
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// Failure to execute script is a terminal error, bye, bye.
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return;
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}
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// TODO(bartlomieju): this thread should return result of event loop
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// that means that we should store JoinHandle to thread to ensure
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// that it actually terminates.
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rt.block_on(worker).expect("Panic in event loop");
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debug!("Worker thread shuts down {}", &name);
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})?;
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let worker_handle = handle_receiver.recv().unwrap()?;
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Ok((join_handle, worker_handle))
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}
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase")]
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struct CreateWorkerArgs {
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name: Option<String>,
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specifier: String,
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has_source_code: bool,
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source_code: String,
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use_deno_namespace: bool,
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}
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/// Create worker as the host
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fn op_create_worker(
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state: &mut OpState,
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args: Value,
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_data: &mut [ZeroCopyBuf],
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) -> Result<Value, AnyError> {
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let args: CreateWorkerArgs = serde_json::from_value(args)?;
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let specifier = args.specifier.clone();
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let maybe_source_code = if args.has_source_code {
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Some(args.source_code.clone())
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} else {
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None
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};
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let args_name = args.name;
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let use_deno_namespace = args.use_deno_namespace;
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if use_deno_namespace {
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super::check_unstable(state, "Worker.deno");
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}
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let permissions = state.borrow::<Permissions>().clone();
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let worker_id = state.take::<WorkerId>();
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state.put::<WorkerId>(worker_id + 1);
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let module_specifier = ModuleSpecifier::resolve_url(&specifier)?;
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let worker_name = args_name.unwrap_or_else(|| "".to_string());
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let cli_state = super::global_state(state);
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let (join_handle, worker_handle) = run_worker_thread(
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worker_id,
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worker_name,
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&cli_state,
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permissions,
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module_specifier,
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use_deno_namespace,
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maybe_source_code,
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)?;
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// At this point all interactions with worker happen using thread
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// safe handler returned from previous function call
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state
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.borrow_mut::<WorkersTable>()
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.insert(worker_id, (join_handle, worker_handle));
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Ok(json!({ "id": worker_id }))
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}
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#[derive(Deserialize)]
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struct WorkerArgs {
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id: i32,
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}
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fn op_host_terminate_worker(
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state: &mut OpState,
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args: Value,
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_data: &mut [ZeroCopyBuf],
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) -> Result<Value, AnyError> {
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let args: WorkerArgs = serde_json::from_value(args)?;
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let id = args.id as u32;
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let (join_handle, worker_handle) = state
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.borrow_mut::<WorkersTable>()
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.remove(&id)
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.expect("No worker handle found");
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worker_handle.terminate();
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join_handle.join().expect("Panic in worker thread");
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Ok(json!({}))
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}
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fn serialize_worker_event(event: WorkerEvent) -> Value {
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match event {
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WorkerEvent::Message(buf) => json!({ "type": "msg", "data": buf }),
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WorkerEvent::TerminalError(error) => {
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let mut serialized_error = json!({
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"type": "terminalError",
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"error": {
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"message": error.to_string(),
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}
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});
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if let Ok(js_error) = error.downcast::<JsError>() {
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serialized_error = json!({
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"type": "terminalError",
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"error": {
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"message": js_error.message,
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"fileName": js_error.script_resource_name,
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"lineNumber": js_error.line_number,
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"columnNumber": js_error.start_column,
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}
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});
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}
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serialized_error
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}
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WorkerEvent::Error(error) => {
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let mut serialized_error = json!({
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"type": "error",
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"error": {
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"message": error.to_string(),
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}
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});
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if let Ok(js_error) = error.downcast::<JsError>() {
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serialized_error = json!({
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"type": "error",
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"error": {
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"message": js_error.message,
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"fileName": js_error.script_resource_name,
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"lineNumber": js_error.line_number,
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"columnNumber": js_error.start_column,
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}
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});
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}
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serialized_error
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}
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}
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}
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/// Get message from guest worker as host
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async fn op_host_get_message(
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state: Rc<RefCell<OpState>>,
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args: Value,
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_zero_copy: BufVec,
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) -> Result<Value, AnyError> {
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let args: WorkerArgs = serde_json::from_value(args)?;
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let id = args.id as u32;
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let worker_handle = {
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let s = state.borrow();
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let workers_table = s.borrow::<WorkersTable>();
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let maybe_handle = workers_table.get(&id);
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if let Some(handle) = maybe_handle {
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handle.1.clone()
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} else {
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// If handle was not found it means worker has already shutdown
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return Ok(json!({ "type": "close" }));
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}
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};
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let response = match worker_handle.get_event().await? {
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Some(event) => {
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// Terminal error means that worker should be removed from worker table.
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if let WorkerEvent::TerminalError(_) = &event {
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let mut s = state.borrow_mut();
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if let Some((join_handle, mut worker_handle)) =
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s.borrow_mut::<WorkersTable>().remove(&id)
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{
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worker_handle.sender.close_channel();
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join_handle.join().expect("Worker thread panicked");
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};
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}
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serialize_worker_event(event)
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}
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None => {
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// Worker shuts down
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let mut s = state.borrow_mut();
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let workers = s.borrow_mut::<WorkersTable>();
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// Try to remove worker from workers table - NOTE: `Worker.terminate()` might have been called
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// already meaning that we won't find worker in table - in that case ignore.
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if let Some((join_handle, mut worker_handle)) = workers.remove(&id) {
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worker_handle.sender.close_channel();
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join_handle.join().expect("Worker thread panicked");
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}
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json!({ "type": "close" })
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}
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};
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Ok(response)
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}
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/// Post message to guest worker as host
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fn op_host_post_message(
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state: &mut OpState,
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args: Value,
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data: &mut [ZeroCopyBuf],
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) -> Result<Value, AnyError> {
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assert_eq!(data.len(), 1, "Invalid number of arguments");
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let args: WorkerArgs = serde_json::from_value(args)?;
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let id = args.id as u32;
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let msg = Vec::from(&*data[0]).into_boxed_slice();
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debug!("post message to worker {}", id);
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let workers = state.borrow::<WorkersTable>();
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let worker_handle = workers[&id].1.clone();
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worker_handle.post_message(msg)?;
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Ok(json!({}))
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}
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