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worker.rs
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worker.rs
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use crate::inspector::DenoInspector;
use crate::inspector::InspectorServer;
use crate::inspector::InspectorSession;
use crate::js;
use crate::metrics::RuntimeMetrics;
use crate::ops;
use crate::permissions::Permissions;
use deno_core::error::AnyError;
use deno_core::futures::future::poll_fn;
use deno_core::futures::future::FutureExt;
use deno_core::futures::stream::StreamExt;
use deno_core::serde_json;
use deno_core::serde_json::json;
use deno_core::url::Url;
use deno_core::GetErrorClassFn;
use deno_core::JsErrorCreateFn;
use deno_core::JsRuntime;
use deno_core::ModuleId;
use deno_core::ModuleLoader;
use deno_core::ModuleSpecifier;
use deno_core::RuntimeOptions;
use std::env;
use std::rc::Rc;
use std::sync::Arc;
use std::task::Context;
use std::task::Poll;
/// This worker is created and used by almost all
/// subcommands in Deno executable.
///
/// It provides ops available in the `Deno` namespace.
///
/// All `WebWorker`s created during program execution
/// are descendants of this worker.
pub struct MainWorker {
inspector: Option<Box<DenoInspector>>,
pub js_runtime: JsRuntime,
should_break_on_first_statement: bool,
}
pub struct WorkerOptions {
pub apply_source_maps: bool,
/// Sets `Deno.args` in JS runtime.
pub args: Vec<String>,
pub debug_flag: bool,
pub unstable: bool,
pub ca_data: Option<Vec<u8>>,
pub user_agent: String,
pub seed: Option<u64>,
pub module_loader: Rc<dyn ModuleLoader>,
// Callback that will be invoked when creating new instance
// of WebWorker
pub create_web_worker_cb: Arc<ops::worker_host::CreateWebWorkerCb>,
pub js_error_create_fn: Option<Rc<JsErrorCreateFn>>,
pub attach_inspector: bool,
pub maybe_inspector_server: Option<Arc<InspectorServer>>,
pub should_break_on_first_statement: bool,
/// Sets `Deno.version.deno` in JS runtime.
pub runtime_version: String,
/// Sets `Deno.version.typescript` in JS runtime.
pub ts_version: String,
/// Sets `Deno.noColor` in JS runtime.
pub no_color: bool,
pub get_error_class_fn: Option<GetErrorClassFn>,
pub location: Option<Url>,
}
impl MainWorker {
pub fn from_options(
main_module: ModuleSpecifier,
permissions: Permissions,
options: &WorkerOptions,
) -> Self {
let mut js_runtime = JsRuntime::new(RuntimeOptions {
module_loader: Some(options.module_loader.clone()),
startup_snapshot: Some(js::deno_isolate_init()),
js_error_create_fn: options.js_error_create_fn.clone(),
get_error_class_fn: options.get_error_class_fn,
..Default::default()
});
let inspector = if options.attach_inspector {
Some(DenoInspector::new(
&mut js_runtime,
options.maybe_inspector_server.clone(),
))
} else {
None
};
let should_break_on_first_statement =
inspector.is_some() && options.should_break_on_first_statement;
let mut worker = Self {
inspector,
js_runtime,
should_break_on_first_statement,
};
let js_runtime = &mut worker.js_runtime;
{
// All ops registered in this function depend on these
{
let op_state = js_runtime.op_state();
let mut op_state = op_state.borrow_mut();
op_state.put(RuntimeMetrics::default());
op_state.put::<Permissions>(permissions);
op_state.put(ops::UnstableChecker {
unstable: options.unstable,
});
}
ops::runtime::init(js_runtime, main_module);
ops::fetch::init(
js_runtime,
options.user_agent.clone(),
options.ca_data.clone(),
);
ops::timers::init(js_runtime);
ops::worker_host::init(
js_runtime,
None,
options.create_web_worker_cb.clone(),
);
ops::crypto::init(js_runtime, options.seed);
ops::reg_json_sync(js_runtime, "op_close", deno_core::op_close);
ops::reg_json_sync(js_runtime, "op_resources", deno_core::op_resources);
ops::reg_json_sync(js_runtime, "op_parse_url", deno_web::op_parse_url);
ops::reg_json_sync(
js_runtime,
"op_parse_url_search_params",
deno_web::op_parse_url_search_params,
);
ops::reg_json_sync(
js_runtime,
"op_stringify_url_search_params",
deno_web::op_stringify_url_search_params,
);
ops::fs_events::init(js_runtime);
ops::fs::init(js_runtime);
ops::io::init(js_runtime);
ops::net::init(js_runtime);
ops::os::init(js_runtime);
ops::permissions::init(js_runtime);
ops::plugin::init(js_runtime);
ops::process::init(js_runtime);
ops::signal::init(js_runtime);
ops::tls::init(js_runtime);
ops::tty::init(js_runtime);
ops::webgpu::init(js_runtime);
ops::websocket::init(
js_runtime,
options.user_agent.clone(),
options.ca_data.clone(),
);
}
{
let op_state = js_runtime.op_state();
let mut op_state = op_state.borrow_mut();
let t = &mut op_state.resource_table;
let (stdin, stdout, stderr) = ops::io::get_stdio();
if let Some(stream) = stdin {
t.add(stream);
}
if let Some(stream) = stdout {
t.add(stream);
}
if let Some(stream) = stderr {
t.add(stream);
}
}
worker
}
pub fn bootstrap(&mut self, options: &WorkerOptions) {
let runtime_options = json!({
"args": options.args,
"applySourceMaps": options.apply_source_maps,
"debugFlag": options.debug_flag,
"denoVersion": options.runtime_version,
"noColor": options.no_color,
"pid": std::process::id(),
"ppid": ops::runtime::ppid(),
"target": env!("TARGET"),
"tsVersion": options.ts_version,
"unstableFlag": options.unstable,
"v8Version": deno_core::v8_version(),
"location": options.location,
});
let script = format!(
"bootstrap.mainRuntime({})",
serde_json::to_string_pretty(&runtime_options).unwrap()
);
self
.execute(&script)
.expect("Failed to execute bootstrap script");
}
/// Same as execute2() but the filename defaults to "$CWD/__anonymous__".
pub fn execute(&mut self, js_source: &str) -> Result<(), AnyError> {
let path = env::current_dir().unwrap().join("__anonymous__");
let url = Url::from_file_path(path).unwrap();
self.js_runtime.execute(url.as_str(), js_source)
}
/// Loads and instantiates specified JavaScript module.
pub async fn preload_module(
&mut self,
module_specifier: &ModuleSpecifier,
) -> Result<ModuleId, AnyError> {
self.js_runtime.load_module(module_specifier, None).await
}
/// Loads, instantiates and executes specified JavaScript module.
pub async fn execute_module(
&mut self,
module_specifier: &ModuleSpecifier,
) -> Result<(), AnyError> {
let id = self.preload_module(module_specifier).await?;
self.wait_for_inspector_session();
let mut receiver = self.js_runtime.mod_evaluate(id);
tokio::select! {
maybe_result = receiver.next() => {
debug!("received module evaluate {:#?}", maybe_result);
let result = maybe_result.expect("Module evaluation result not provided.");
return result;
}
event_loop_result = self.run_event_loop() => {
event_loop_result?;
let maybe_result = receiver.next().await;
let result = maybe_result.expect("Module evaluation result not provided.");
return result;
}
}
}
fn wait_for_inspector_session(&mut self) {
if self.should_break_on_first_statement {
self
.inspector
.as_mut()
.unwrap()
.wait_for_session_and_break_on_next_statement()
}
}
/// Create new inspector session. This function panics if Worker
/// was not configured to create inspector.
pub fn create_inspector_session(&mut self) -> Box<InspectorSession> {
let inspector = self.inspector.as_mut().unwrap();
InspectorSession::new(&mut **inspector)
}
pub fn poll_event_loop(
&mut self,
cx: &mut Context,
) -> Poll<Result<(), AnyError>> {
// We always poll the inspector if it exists.
let _ = self.inspector.as_mut().map(|i| i.poll_unpin(cx));
self.js_runtime.poll_event_loop(cx)
}
pub async fn run_event_loop(&mut self) -> Result<(), AnyError> {
poll_fn(|cx| self.poll_event_loop(cx)).await
}
}
impl Drop for MainWorker {
fn drop(&mut self) {
// The Isolate object must outlive the Inspector object, but this is
// currently not enforced by the type system.
self.inspector.take();
}
}
#[cfg(test)]
mod tests {
use super::*;
use deno_core::resolve_url_or_path;
fn create_test_worker() -> MainWorker {
let main_module = resolve_url_or_path("./hello.js").unwrap();
let permissions = Permissions::default();
let options = WorkerOptions {
apply_source_maps: false,
user_agent: "x".to_string(),
args: vec![],
debug_flag: false,
unstable: false,
ca_data: None,
seed: None,
js_error_create_fn: None,
create_web_worker_cb: Arc::new(|_| unreachable!()),
attach_inspector: false,
maybe_inspector_server: None,
should_break_on_first_statement: false,
module_loader: Rc::new(deno_core::FsModuleLoader),
runtime_version: "x".to_string(),
ts_version: "x".to_string(),
no_color: true,
get_error_class_fn: None,
location: None,
};
MainWorker::from_options(main_module, permissions, &options)
}
#[tokio::test]
async fn execute_mod_esm_imports_a() {
let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.parent()
.unwrap()
.join("cli/tests/esm_imports_a.js");
let module_specifier = resolve_url_or_path(&p.to_string_lossy()).unwrap();
let mut worker = create_test_worker();
let result = worker.execute_module(&module_specifier).await;
if let Err(err) = result {
eprintln!("execute_mod err {:?}", err);
}
if let Err(e) = worker.run_event_loop().await {
panic!("Future got unexpected error: {:?}", e);
}
}
#[tokio::test]
async fn execute_mod_circular() {
let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.parent()
.unwrap()
.join("tests/circular1.js");
let module_specifier = resolve_url_or_path(&p.to_string_lossy()).unwrap();
let mut worker = create_test_worker();
let result = worker.execute_module(&module_specifier).await;
if let Err(err) = result {
eprintln!("execute_mod err {:?}", err);
}
if let Err(e) = worker.run_event_loop().await {
panic!("Future got unexpected error: {:?}", e);
}
}
#[tokio::test]
async fn execute_mod_resolve_error() {
// "foo" is not a valid module specifier so this should return an error.
let mut worker = create_test_worker();
let module_specifier = resolve_url_or_path("does-not-exist").unwrap();
let result = worker.execute_module(&module_specifier).await;
assert!(result.is_err());
}
#[tokio::test]
async fn execute_mod_002_hello() {
// This assumes cwd is project root (an assumption made throughout the
// tests).
let mut worker = create_test_worker();
let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.parent()
.unwrap()
.join("cli/tests/001_hello.js");
let module_specifier = resolve_url_or_path(&p.to_string_lossy()).unwrap();
let result = worker.execute_module(&module_specifier).await;
assert!(result.is_ok());
}
}