mirror of
https://github.com/denoland/deno
synced 2024-08-27 20:09:17 +00:00
![Divy Srivastava](/assets/img/avatar_default.png)
This introduces the `denort` binary - a slim version of deno without tooling. The binary is used as the default for `deno compile`. Improves `deno compile` final size by ~2.5x (141 MB -> 61 MB) on Linux x86_64.
258 lines
8.4 KiB
Rust
258 lines
8.4 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use crate::cdp;
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use crate::emit::Emitter;
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use crate::util::file_watcher::WatcherCommunicator;
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use crate::util::file_watcher::WatcherRestartMode;
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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::futures::StreamExt;
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use deno_core::serde_json::json;
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use deno_core::serde_json::{self};
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use deno_core::url::Url;
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use deno_core::LocalInspectorSession;
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use deno_terminal::colors;
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use std::collections::HashMap;
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use std::path::PathBuf;
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use std::sync::Arc;
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use tokio::select;
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fn explain(status: &cdp::Status) -> &'static str {
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match status {
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cdp::Status::Ok => "OK",
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cdp::Status::CompileError => "compile error",
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cdp::Status::BlockedByActiveGenerator => "blocked by active generator",
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cdp::Status::BlockedByActiveFunction => "blocked by active function",
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cdp::Status::BlockedByTopLevelEsModuleChange => {
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"blocked by top-level ES module change"
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}
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}
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}
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fn should_retry(status: &cdp::Status) -> bool {
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match status {
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cdp::Status::Ok => false,
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cdp::Status::CompileError => false,
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cdp::Status::BlockedByActiveGenerator => true,
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cdp::Status::BlockedByActiveFunction => true,
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cdp::Status::BlockedByTopLevelEsModuleChange => false,
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}
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}
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/// This structure is responsible for providing Hot Module Replacement
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/// functionality.
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///
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/// It communicates with V8 inspector over a local session and waits for
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/// notifications about changed files from the `FileWatcher`.
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///
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/// Upon receiving such notification, the runner decides if the changed
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/// path should be handled the `FileWatcher` itself (as if we were running
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/// in `--watch` mode), or if the path is eligible to be hot replaced in the
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/// current program.
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///
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/// Even if the runner decides that a path will be hot-replaced, the V8 isolate
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/// can refuse to perform hot replacement, eg. a top-level variable/function
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/// of an ES module cannot be hot-replaced. In such situation the runner will
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/// force a full restart of a program by notifying the `FileWatcher`.
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pub struct HmrRunner {
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session: LocalInspectorSession,
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watcher_communicator: Arc<WatcherCommunicator>,
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script_ids: HashMap<String, String>,
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emitter: Arc<Emitter>,
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}
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#[async_trait::async_trait(?Send)]
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impl crate::worker::HmrRunner for HmrRunner {
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// TODO(bartlomieju): this code is duplicated in `cli/tools/coverage/mod.rs`
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async fn start(&mut self) -> Result<(), AnyError> {
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self.enable_debugger().await
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}
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// TODO(bartlomieju): this code is duplicated in `cli/tools/coverage/mod.rs`
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async fn stop(&mut self) -> Result<(), AnyError> {
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self
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.watcher_communicator
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.change_restart_mode(WatcherRestartMode::Automatic);
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self.disable_debugger().await
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}
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async fn run(&mut self) -> Result<(), AnyError> {
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self
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.watcher_communicator
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.change_restart_mode(WatcherRestartMode::Manual);
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let mut session_rx = self.session.take_notification_rx();
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loop {
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select! {
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biased;
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Some(notification) = session_rx.next() => {
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let notification = serde_json::from_value::<cdp::Notification>(notification)?;
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if notification.method == "Runtime.exceptionThrown" {
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let exception_thrown = serde_json::from_value::<cdp::ExceptionThrown>(notification.params)?;
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let (message, description) = exception_thrown.exception_details.get_message_and_description();
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break Err(generic_error(format!("{} {}", message, description)));
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} else if notification.method == "Debugger.scriptParsed" {
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let params = serde_json::from_value::<cdp::ScriptParsed>(notification.params)?;
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if params.url.starts_with("file://") {
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let file_url = Url::parse(¶ms.url).unwrap();
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let file_path = file_url.to_file_path().unwrap();
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if let Ok(canonicalized_file_path) = file_path.canonicalize() {
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let canonicalized_file_url = Url::from_file_path(canonicalized_file_path).unwrap();
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self.script_ids.insert(canonicalized_file_url.to_string(), params.script_id);
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}
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}
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}
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}
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changed_paths = self.watcher_communicator.watch_for_changed_paths() => {
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let changed_paths = changed_paths?;
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let Some(changed_paths) = changed_paths else {
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let _ = self.watcher_communicator.force_restart();
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continue;
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};
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let filtered_paths: Vec<PathBuf> = changed_paths.into_iter().filter(|p| p.extension().map_or(false, |ext| {
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let ext_str = ext.to_str().unwrap();
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matches!(ext_str, "js" | "ts" | "jsx" | "tsx")
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})).collect();
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// If after filtering there are no paths it means it's either a file
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// we can't HMR or an external file that was passed explicitly to
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// `--unstable-hmr=<file>` path.
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if filtered_paths.is_empty() {
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let _ = self.watcher_communicator.force_restart();
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continue;
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}
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for path in filtered_paths {
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let Some(path_str) = path.to_str() else {
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let _ = self.watcher_communicator.force_restart();
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continue;
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};
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let Ok(module_url) = Url::from_file_path(path_str) else {
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let _ = self.watcher_communicator.force_restart();
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continue;
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};
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let Some(id) = self.script_ids.get(module_url.as_str()).cloned() else {
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let _ = self.watcher_communicator.force_restart();
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continue;
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};
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let source_code = self.emitter.load_and_emit_for_hmr(
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&module_url
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).await?;
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let mut tries = 1;
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loop {
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let result = self.set_script_source(&id, source_code.as_str()).await?;
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if matches!(result.status, cdp::Status::Ok) {
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self.dispatch_hmr_event(module_url.as_str()).await?;
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self.watcher_communicator.print(format!("Replaced changed module {}", module_url.as_str()));
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break;
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}
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self.watcher_communicator.print(format!("Failed to reload module {}: {}.", module_url, colors::gray(explain(&result.status))));
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if should_retry(&result.status) && tries <= 2 {
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tries += 1;
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tokio::time::sleep(std::time::Duration::from_millis(100)).await;
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continue;
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}
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let _ = self.watcher_communicator.force_restart();
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break;
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}
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}
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}
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_ = self.session.receive_from_v8_session() => {}
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}
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}
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}
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}
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impl HmrRunner {
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pub fn new(
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emitter: Arc<Emitter>,
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session: LocalInspectorSession,
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watcher_communicator: Arc<WatcherCommunicator>,
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) -> Self {
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Self {
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session,
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emitter,
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watcher_communicator,
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script_ids: HashMap::new(),
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}
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}
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// TODO(bartlomieju): this code is duplicated in `cli/tools/coverage/mod.rs`
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async fn enable_debugger(&mut self) -> Result<(), AnyError> {
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self
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.session
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.post_message::<()>("Debugger.enable", None)
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.await?;
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self
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.session
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.post_message::<()>("Runtime.enable", None)
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.await?;
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Ok(())
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}
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// TODO(bartlomieju): this code is duplicated in `cli/tools/coverage/mod.rs`
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async fn disable_debugger(&mut self) -> Result<(), AnyError> {
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self
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.session
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.post_message::<()>("Debugger.disable", None)
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.await?;
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self
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.session
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.post_message::<()>("Runtime.disable", None)
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.await?;
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Ok(())
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}
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async fn set_script_source(
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&mut self,
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script_id: &str,
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source: &str,
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) -> Result<cdp::SetScriptSourceResponse, AnyError> {
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let result = self
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.session
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.post_message(
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"Debugger.setScriptSource",
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Some(json!({
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"scriptId": script_id,
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"scriptSource": source,
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"allowTopFrameEditing": true,
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})),
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)
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.await?;
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Ok(serde_json::from_value::<cdp::SetScriptSourceResponse>(
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result,
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)?)
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}
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async fn dispatch_hmr_event(
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&mut self,
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script_id: &str,
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) -> Result<(), AnyError> {
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let expr = format!(
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"dispatchEvent(new CustomEvent(\"hmr\", {{ detail: {{ path: \"{}\" }} }}));",
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script_id
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);
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let _result = self
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.session
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.post_message(
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"Runtime.evaluate",
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Some(json!({
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"expression": expr,
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"contextId": Some(1),
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})),
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)
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.await?;
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Ok(())
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}
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}
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