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worker.rs
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worker.rs
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use crate::compiler::compile_async;
use crate::compiler::ModuleMetaData;
use crate::errors::DenoError;
use crate::errors::RustOrJsError;
use crate::js_errors;
use crate::js_errors::JSErrorColor;
use crate::msg;
use crate::state::ThreadSafeState;
use crate::tokio_util;
use deno;
use deno::deno_mod;
use deno::JSError;
use deno::StartupData;
use futures::future::Either;
use futures::Async;
use futures::Future;
use std::sync::atomic::Ordering;
/// Wraps deno::Isolate to provide source maps, ops for the CLI, and
/// high-level module loading
pub struct Worker {
inner: deno::Isolate<ThreadSafeState>,
state: ThreadSafeState,
}
impl Worker {
pub fn new(
_name: String,
startup_data: StartupData,
state: ThreadSafeState,
) -> Worker {
let state_ = state.clone();
Self {
inner: deno::Isolate::new(startup_data, state_),
state,
}
}
/// Same as execute2() but the filename defaults to "<anonymous>".
pub fn execute(&mut self, js_source: &str) -> Result<(), JSError> {
self.execute2("<anonymous>", js_source)
}
/// Executes the provided JavaScript source code. The js_filename argument is
/// provided only for debugging purposes.
pub fn execute2(
&mut self,
js_filename: &str,
js_source: &str,
) -> Result<(), JSError> {
self.inner.execute(js_filename, js_source)
}
// TODO(ry) make this return a future.
fn mod_load_deps(&self, id: deno_mod) -> Result<(), RustOrJsError> {
// basically iterate over the imports, start loading them.
let referrer_name = {
let g = self.state.modules.lock().unwrap();
g.get_name(id).unwrap().clone()
};
for specifier in self.inner.mod_get_imports(id) {
let (name, _local_filename) = self
.state
.dir
.resolve_module(&specifier, &referrer_name)
.map_err(DenoError::from)
.map_err(RustOrJsError::from)?;
debug!("mod_load_deps {}", name);
if !self.state.modules.lock().unwrap().is_registered(&name) {
let out = fetch_module_meta_data_and_maybe_compile(
&self.state,
&specifier,
&referrer_name,
)?;
let child_id = self.mod_new_and_register(
false,
&out.module_name.clone(),
&out.js_source(),
)?;
// The resolved module is an alias to another module (due to redirects).
// Save such alias to the module map.
if out.module_redirect_source_name.is_some() {
self.mod_alias(
&out.module_redirect_source_name.clone().unwrap(),
&out.module_name,
);
}
self.mod_load_deps(child_id)?;
}
}
Ok(())
}
/// Executes the provided JavaScript module.
pub fn execute_mod(
&mut self,
js_filename: &str,
is_prefetch: bool,
) -> Result<(), RustOrJsError> {
// TODO move state::execute_mod impl here.
self
.execute_mod_inner(js_filename, is_prefetch)
.map_err(|err| match err {
RustOrJsError::Js(err) => RustOrJsError::Js(self.apply_source_map(err)),
x => x,
})
}
/// High-level way to execute modules.
/// This will issue HTTP requests and file system calls.
/// Blocks. TODO(ry) Don't block.
fn execute_mod_inner(
&mut self,
url: &str,
is_prefetch: bool,
) -> Result<(), RustOrJsError> {
let out = fetch_module_meta_data_and_maybe_compile(&self.state, url, ".")
.map_err(RustOrJsError::from)?;
// Be careful.
// url might not match the actual out.module_name
// due to the mechanism of redirection.
let id = self
.mod_new_and_register(true, &out.module_name.clone(), &out.js_source())
.map_err(RustOrJsError::from)?;
// The resolved module is an alias to another module (due to redirects).
// Save such alias to the module map.
if out.module_redirect_source_name.is_some() {
self.mod_alias(
&out.module_redirect_source_name.clone().unwrap(),
&out.module_name,
);
}
self.mod_load_deps(id)?;
let state = self.state.clone();
let mut resolve = move |specifier: &str, referrer: deno_mod| -> deno_mod {
state.metrics.resolve_count.fetch_add(1, Ordering::Relaxed);
let mut modules = state.modules.lock().unwrap();
modules.resolve_cb(&state.dir, specifier, referrer)
};
self
.inner
.mod_instantiate(id, &mut resolve)
.map_err(RustOrJsError::from)?;
if !is_prefetch {
self.inner.mod_evaluate(id).map_err(RustOrJsError::from)?;
}
Ok(())
}
/// Wraps Isolate::mod_new but registers with modules.
fn mod_new_and_register(
&self,
main: bool,
name: &str,
source: &str,
) -> Result<deno_mod, JSError> {
let id = self.inner.mod_new(main, name, source)?;
self.state.modules.lock().unwrap().register(id, &name);
Ok(id)
}
/// Create an alias for another module.
/// The alias could later be used to grab the module
/// which `target` points to.
fn mod_alias(&self, name: &str, target: &str) {
self.state.modules.lock().unwrap().alias(name, target);
}
pub fn print_file_info(&self, module: &str) {
let m = self.state.modules.lock().unwrap();
m.print_file_info(&self.state.dir, module.to_string());
}
/// Applies source map to the error.
fn apply_source_map(&self, err: JSError) -> JSError {
js_errors::apply_source_map(&err, &self.state.dir)
}
}
impl Future for Worker {
type Item = ();
type Error = JSError;
fn poll(&mut self) -> Result<Async<()>, Self::Error> {
self.inner.poll().map_err(|err| self.apply_source_map(err))
}
}
fn fetch_module_meta_data_and_maybe_compile_async(
state: &ThreadSafeState,
specifier: &str,
referrer: &str,
) -> impl Future<Item = ModuleMetaData, Error = DenoError> {
let use_cache = !state.flags.reload;
let state_ = state.clone();
let specifier = specifier.to_string();
let referrer = referrer.to_string();
state
.dir
.fetch_module_meta_data_async(&specifier, &referrer, use_cache)
.and_then(move |out| {
if out.media_type == msg::MediaType::TypeScript
&& !out.has_output_code_and_source_map()
{
debug!(">>>>> compile_sync START");
Either::A(
compile_async(state_.clone(), &specifier, &referrer, &out)
.map_err(|e| {
debug!("compiler error exiting!");
eprintln!("{}", JSErrorColor(&e).to_string());
std::process::exit(1);
}).and_then(move |out| {
debug!(">>>>> compile_sync END");
state_.dir.code_cache(&out)?;
Ok(out)
}),
)
} else {
Either::B(futures::future::ok(out))
}
})
}
fn fetch_module_meta_data_and_maybe_compile(
state: &ThreadSafeState,
specifier: &str,
referrer: &str,
) -> Result<ModuleMetaData, DenoError> {
tokio_util::block_on(fetch_module_meta_data_and_maybe_compile_async(
state, specifier, referrer,
))
}
#[cfg(test)]
mod tests {
use super::*;
use crate::flags;
use crate::ops::op_selector_std;
use crate::resources;
use crate::startup_data;
use crate::state::ThreadSafeState;
use crate::tokio_util;
use deno::js_check;
use futures::future::lazy;
use std::sync::atomic::Ordering;
use std::thread;
#[test]
fn execute_mod() {
let filename = std::env::current_dir()
.unwrap()
.join("tests/esm_imports_a.js");
let filename = filename.to_str().unwrap().to_string();
let argv = vec![String::from("./deno"), filename.clone()];
let (flags, rest_argv) = flags::set_flags(argv).unwrap();
let state = ThreadSafeState::new(flags, rest_argv, op_selector_std);
let state_ = state.clone();
tokio_util::run(lazy(move || {
let mut worker =
Worker::new("TEST".to_string(), StartupData::None, state);
if let Err(err) = worker.execute_mod(&filename, false) {
eprintln!("execute_mod err {:?}", err);
}
tokio_util::panic_on_error(worker)
}));
let metrics = &state_.metrics;
assert_eq!(metrics.resolve_count.load(Ordering::SeqCst), 1);
}
#[test]
fn execute_mod_circular() {
let filename = std::env::current_dir().unwrap().join("tests/circular1.js");
let filename = filename.to_str().unwrap().to_string();
let argv = vec![String::from("./deno"), filename.clone()];
let (flags, rest_argv) = flags::set_flags(argv).unwrap();
let state = ThreadSafeState::new(flags, rest_argv, op_selector_std);
let state_ = state.clone();
tokio_util::run(lazy(move || {
let mut worker =
Worker::new("TEST".to_string(), StartupData::None, state);
if let Err(err) = worker.execute_mod(&filename, false) {
eprintln!("execute_mod err {:?}", err);
}
tokio_util::panic_on_error(worker)
}));
let metrics = &state_.metrics;
assert_eq!(metrics.resolve_count.load(Ordering::SeqCst), 2);
}
fn create_test_worker() -> Worker {
let state = ThreadSafeState::mock();
let mut worker =
Worker::new("TEST".to_string(), startup_data::deno_isolate_init(), state);
js_check(worker.execute("denoMain()"));
js_check(worker.execute("workerMain()"));
worker
}
#[test]
fn test_worker_messages() {
tokio_util::init(|| {
let mut worker = create_test_worker();
let source = r#"
onmessage = function(e) {
console.log("msg from main script", e.data);
if (e.data == "exit") {
close();
return;
} else {
console.assert(e.data === "hi");
}
postMessage([1, 2, 3]);
console.log("after postMessage");
}
"#;
js_check(worker.execute(source));
let resource = worker.state.resource.clone();
let resource_ = resource.clone();
tokio::spawn(lazy(move || {
worker.then(move |r| -> Result<(), ()> {
resource_.close();
js_check(r);
Ok(())
})
}));
let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
let r = resources::post_message_to_worker(resource.rid, msg).wait();
assert!(r.is_ok());
let maybe_msg = resources::get_message_from_worker(resource.rid)
.wait()
.unwrap();
assert!(maybe_msg.is_some());
// Check if message received is [1, 2, 3] in json
assert_eq!(*maybe_msg.unwrap(), *b"[1,2,3]");
let msg = json!("exit")
.to_string()
.into_boxed_str()
.into_boxed_bytes();
let r = resources::post_message_to_worker(resource.rid, msg).wait();
assert!(r.is_ok());
})
}
#[test]
fn removed_from_resource_table_on_close() {
tokio_util::init(|| {
let mut worker = create_test_worker();
js_check(
worker.execute("onmessage = () => { delete window['onmessage']; }"),
);
let resource = worker.state.resource.clone();
let rid = resource.rid;
tokio::spawn(lazy(move || {
worker.then(move |r| -> Result<(), ()> {
resource.close();
println!("workers.rs after resource close");
js_check(r);
Ok(())
})
}));
assert_eq!(resources::get_type(rid), Some("worker".to_string()));
let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
let r = resources::post_message_to_worker(rid, msg).wait();
assert!(r.is_ok());
debug!("rid {:?}", rid);
// TODO Need a way to get a future for when a resource closes.
// For now, just sleep for a bit.
thread::sleep(std::time::Duration::from_millis(1000));
assert_eq!(resources::get_type(rid), None);
})
}
}