mirror of
https://github.com/denoland/deno
synced 2024-08-25 02:57:22 +00:00
375 lines
10 KiB
Rust
375 lines
10 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use crate::colors;
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use crate::fs_util::canonicalize_path;
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use deno_core::error::AnyError;
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use deno_core::error::JsError;
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use deno_core::futures::Future;
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use deno_runtime::fmt_errors::format_js_error;
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use log::info;
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use notify::event::Event as NotifyEvent;
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use notify::event::EventKind;
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use notify::Error as NotifyError;
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use notify::RecommendedWatcher;
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use notify::RecursiveMode;
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use notify::Watcher;
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use std::collections::HashSet;
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use std::path::PathBuf;
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::select;
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use tokio::sync::mpsc;
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use tokio::sync::mpsc::UnboundedReceiver;
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use tokio::time::sleep;
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const CLEAR_SCREEN: &str = "\x1B[2J\x1B[1;1H";
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const DEBOUNCE_INTERVAL: Duration = Duration::from_millis(200);
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struct DebouncedReceiver {
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// The `recv()` call could be used in a tokio `select!` macro,
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// and so we store this state on the struct to ensure we don't
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// lose items if a `recv()` never completes
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received_items: HashSet<PathBuf>,
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receiver: UnboundedReceiver<Vec<PathBuf>>,
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}
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impl DebouncedReceiver {
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fn new_with_sender() -> (Arc<mpsc::UnboundedSender<Vec<PathBuf>>>, Self) {
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let (sender, receiver) = mpsc::unbounded_channel();
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(
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Arc::new(sender),
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Self {
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receiver,
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received_items: HashSet::new(),
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},
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)
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}
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async fn recv(&mut self) -> Option<Vec<PathBuf>> {
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if self.received_items.is_empty() {
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self
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.received_items
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.extend(self.receiver.recv().await?.into_iter());
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}
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loop {
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select! {
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items = self.receiver.recv() => {
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self.received_items.extend(items?);
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}
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_ = sleep(DEBOUNCE_INTERVAL) => {
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return Some(self.received_items.drain().collect());
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}
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}
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}
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}
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}
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async fn error_handler<F>(watch_future: F)
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where
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F: Future<Output = Result<(), AnyError>>,
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{
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let result = watch_future.await;
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if let Err(err) = result {
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let error_string = match err.downcast_ref::<JsError>() {
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Some(e) => format_js_error(e),
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None => format!("{:?}", err),
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};
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eprintln!(
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"{}: {}",
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colors::red_bold("error"),
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error_string.trim_start_matches("error: ")
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);
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}
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}
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pub enum ResolutionResult<T> {
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Restart {
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paths_to_watch: Vec<PathBuf>,
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result: Result<T, AnyError>,
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},
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Ignore,
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}
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async fn next_restart<R, T, F>(
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resolver: &mut R,
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debounced_receiver: &mut DebouncedReceiver,
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) -> (Vec<PathBuf>, Result<T, AnyError>)
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where
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R: FnMut(Option<Vec<PathBuf>>) -> F,
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F: Future<Output = ResolutionResult<T>>,
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{
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loop {
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let changed = debounced_receiver.recv().await;
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match resolver(changed).await {
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ResolutionResult::Ignore => {
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log::debug!("File change ignored")
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}
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ResolutionResult::Restart {
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paths_to_watch,
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result,
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} => {
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return (paths_to_watch, result);
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}
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}
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}
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}
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pub struct PrintConfig {
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/// printing watcher status to terminal.
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pub job_name: String,
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/// determine whether to clear the terminal screen
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pub clear_screen: bool,
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}
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fn create_print_after_restart_fn(clear_screen: bool) -> impl Fn() {
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move || {
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if clear_screen {
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eprint!("{}", CLEAR_SCREEN);
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}
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info!(
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"{} File change detected! Restarting!",
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colors::intense_blue("Watcher"),
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);
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}
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}
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/// Creates a file watcher, which will call `resolver` with every file change.
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///
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/// - `resolver` is used for resolving file paths to be watched at every restarting
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/// of the watcher, and can also return a value to be passed to `operation`.
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/// It returns a [`ResolutionResult`], which can either instruct the watcher to restart or ignore the change.
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/// This always contains paths to watch;
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///
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/// - `operation` is the actual operation we want to run every time the watcher detects file
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/// changes. For example, in the case where we would like to bundle, then `operation` would
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/// have the logic for it like bundling the code.
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pub async fn watch_func<R, O, T, F1, F2>(
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mut resolver: R,
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mut operation: O,
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print_config: PrintConfig,
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) -> Result<(), AnyError>
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where
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R: FnMut(Option<Vec<PathBuf>>) -> F1,
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O: FnMut(T) -> F2,
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F1: Future<Output = ResolutionResult<T>>,
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F2: Future<Output = Result<(), AnyError>>,
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{
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let (sender, mut receiver) = DebouncedReceiver::new_with_sender();
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let PrintConfig {
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job_name,
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clear_screen,
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} = print_config;
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// Store previous data. If module resolution fails at some point, the watcher will try to
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// continue watching files using these data.
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let mut paths_to_watch;
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let mut resolution_result;
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let print_after_restart = create_print_after_restart_fn(clear_screen);
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match resolver(None).await {
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ResolutionResult::Ignore => {
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// The only situation where it makes sense to ignore the initial 'change'
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// is if the command isn't supposed to do anything until something changes,
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// e.g. a variant of `deno test` which doesn't run the entire test suite to start with,
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// but instead does nothing until you make a change.
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//
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// In that case, this is probably the correct output.
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info!(
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"{} Waiting for file changes...",
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colors::intense_blue("Watcher"),
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);
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let (paths, result) = next_restart(&mut resolver, &mut receiver).await;
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paths_to_watch = paths;
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resolution_result = result;
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print_after_restart();
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}
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ResolutionResult::Restart {
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paths_to_watch: paths,
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result,
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} => {
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paths_to_watch = paths;
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resolution_result = result;
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}
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};
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info!("{} {} started.", colors::intense_blue("Watcher"), job_name,);
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loop {
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let mut watcher = new_watcher(sender.clone())?;
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add_paths_to_watcher(&mut watcher, &paths_to_watch);
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match resolution_result {
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Ok(operation_arg) => {
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let fut = error_handler(operation(operation_arg));
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select! {
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(paths, result) = next_restart(&mut resolver, &mut receiver) => {
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if result.is_ok() {
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paths_to_watch = paths;
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}
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resolution_result = result;
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print_after_restart();
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continue;
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},
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_ = fut => {},
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};
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info!(
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"{} {} finished. Restarting on file change...",
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colors::intense_blue("Watcher"),
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job_name,
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);
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}
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Err(error) => {
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eprintln!("{}: {}", colors::red_bold("error"), error);
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info!(
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"{} {} failed. Restarting on file change...",
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colors::intense_blue("Watcher"),
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job_name,
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);
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}
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}
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let (paths, result) = next_restart(&mut resolver, &mut receiver).await;
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if result.is_ok() {
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paths_to_watch = paths;
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}
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resolution_result = result;
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print_after_restart();
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drop(watcher);
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}
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}
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/// Creates a file watcher.
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///
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/// - `operation` is the actual operation we want to run every time the watcher detects file
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/// changes. For example, in the case where we would like to bundle, then `operation` would
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/// have the logic for it like bundling the code.
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pub async fn watch_func2<T: Clone, O, F>(
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mut paths_to_watch_receiver: UnboundedReceiver<Vec<PathBuf>>,
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mut operation: O,
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operation_args: T,
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print_config: PrintConfig,
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) -> Result<(), AnyError>
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where
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O: FnMut(T) -> Result<F, AnyError>,
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F: Future<Output = Result<(), AnyError>>,
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{
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let (watcher_sender, mut watcher_receiver) =
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DebouncedReceiver::new_with_sender();
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let PrintConfig {
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job_name,
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clear_screen,
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} = print_config;
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let print_after_restart = create_print_after_restart_fn(clear_screen);
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info!("{} {} started.", colors::intense_blue("Watcher"), job_name,);
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fn consume_paths_to_watch(
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watcher: &mut RecommendedWatcher,
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receiver: &mut UnboundedReceiver<Vec<PathBuf>>,
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) {
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loop {
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match receiver.try_recv() {
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Ok(paths) => {
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add_paths_to_watcher(watcher, &paths);
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}
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Err(e) => match e {
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mpsc::error::TryRecvError::Empty => {
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break;
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}
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// there must be at least one receiver alive
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_ => unreachable!(),
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},
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}
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}
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}
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loop {
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let mut watcher = new_watcher(watcher_sender.clone())?;
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consume_paths_to_watch(&mut watcher, &mut paths_to_watch_receiver);
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let receiver_future = async {
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loop {
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let maybe_paths = paths_to_watch_receiver.recv().await;
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add_paths_to_watcher(&mut watcher, &maybe_paths.unwrap());
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}
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};
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let operation_future = error_handler(operation(operation_args.clone())?);
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select! {
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_ = receiver_future => {},
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_ = watcher_receiver.recv() => {
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print_after_restart();
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continue;
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},
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_ = operation_future => {
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// TODO(bartlomieju): print exit code here?
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info!(
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"{} {} finished. Restarting on file change...",
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colors::intense_blue("Watcher"),
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job_name,
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);
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consume_paths_to_watch(&mut watcher, &mut paths_to_watch_receiver);
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},
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};
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let receiver_future = async {
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loop {
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let maybe_paths = paths_to_watch_receiver.recv().await;
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add_paths_to_watcher(&mut watcher, &maybe_paths.unwrap());
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}
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};
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select! {
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_ = receiver_future => {},
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_ = watcher_receiver.recv() => {
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print_after_restart();
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continue;
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},
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};
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}
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}
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fn new_watcher(
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sender: Arc<mpsc::UnboundedSender<Vec<PathBuf>>>,
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) -> Result<RecommendedWatcher, AnyError> {
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let watcher = Watcher::new(
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move |res: Result<NotifyEvent, NotifyError>| {
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if let Ok(event) = res {
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if matches!(
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event.kind,
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EventKind::Create(_) | EventKind::Modify(_) | EventKind::Remove(_)
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) {
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let paths = event
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.paths
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.iter()
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.filter_map(|path| canonicalize_path(path).ok())
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.collect();
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sender.send(paths).unwrap();
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}
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}
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},
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Default::default(),
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)?;
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Ok(watcher)
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}
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fn add_paths_to_watcher(watcher: &mut RecommendedWatcher, paths: &[PathBuf]) {
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// Ignore any error e.g. `PathNotFound`
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for path in paths {
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let _ = watcher.watch(path, RecursiveMode::Recursive);
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}
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log::debug!("Watching paths: {:?}", paths);
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}
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