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denoland-deno/runtime/ops/fs_events.rs

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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use crate::permissions::Permissions;
use deno_core::error::AnyError;
use deno_core::parking_lot::Mutex;
use deno_core::AsyncRefCell;
use deno_core::CancelFuture;
use deno_core::CancelHandle;
use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::op;
use deno_core::Extension;
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use notify::event::Event as NotifyEvent;
use notify::Error as NotifyError;
use notify::EventKind;
use notify::RecommendedWatcher;
use notify::RecursiveMode;
use notify::Watcher;
use serde::Deserialize;
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use serde::Serialize;
use std::borrow::Cow;
use std::cell::RefCell;
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use std::convert::From;
use std::path::PathBuf;
use std::rc::Rc;
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use tokio::sync::mpsc;
pub fn init() -> Extension {
Extension::builder()
.ops(vec![op_fs_events_open::decl(), op_fs_events_poll::decl()])
.build()
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}
struct FsEventsResource {
#[allow(unused)]
watcher: RecommendedWatcher,
receiver: AsyncRefCell<mpsc::Receiver<Result<FsEvent, AnyError>>>,
cancel: CancelHandle,
}
impl Resource for FsEventsResource {
fn name(&self) -> Cow<str> {
"fsEvents".into()
}
fn close(self: Rc<Self>) {
self.cancel.cancel();
}
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}
/// Represents a file system event.
///
/// We do not use the event directly from the notify crate. We flatten
/// the structure into this simpler structure. We want to only make it more
/// complex as needed.
///
/// Feel free to expand this struct as long as you can add tests to demonstrate
/// the complexity.
#[derive(Serialize, Debug)]
struct FsEvent {
kind: &'static str,
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paths: Vec<PathBuf>,
flag: Option<&'static str>,
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}
impl From<NotifyEvent> for FsEvent {
fn from(e: NotifyEvent) -> Self {
let kind = match e.kind {
EventKind::Any => "any",
EventKind::Access(_) => "access",
EventKind::Create(_) => "create",
EventKind::Modify(_) => "modify",
EventKind::Remove(_) => "remove",
EventKind::Other => "other",
};
let flag = e.flag().map(|f| match f {
notify::event::Flag::Rescan => "rescan",
});
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FsEvent {
kind,
paths: e.paths,
flag,
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}
}
}
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#[derive(Deserialize)]
pub struct OpenArgs {
recursive: bool,
paths: Vec<String>,
}
#[op]
fn op_fs_events_open(
state: &mut OpState,
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args: OpenArgs,
) -> Result<ResourceId, AnyError> {
let (sender, receiver) = mpsc::channel::<Result<FsEvent, AnyError>>(16);
let sender = Mutex::new(sender);
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let mut watcher: RecommendedWatcher =
Watcher::new(move |res: Result<NotifyEvent, NotifyError>| {
let res2 = res.map(FsEvent::from).map_err(AnyError::from);
let sender = sender.lock();
// Ignore result, if send failed it means that watcher was already closed,
// but not all messages have been flushed.
let _ = sender.try_send(res2);
})?;
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let recursive_mode = if args.recursive {
RecursiveMode::Recursive
} else {
RecursiveMode::NonRecursive
};
for path in &args.paths {
let path = PathBuf::from(path);
state.borrow_mut::<Permissions>().read.check(&path)?;
watcher.watch(&path, recursive_mode)?;
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}
let resource = FsEventsResource {
watcher,
receiver: AsyncRefCell::new(receiver),
cancel: Default::default(),
};
let rid = state.resource_table.add(resource);
Ok(rid)
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}
#[op]
async fn op_fs_events_poll(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
) -> Result<Option<FsEvent>, AnyError> {
let resource = state.borrow().resource_table.get::<FsEventsResource>(rid)?;
let mut receiver = RcRef::map(&resource, |r| &r.receiver).borrow_mut().await;
let cancel = RcRef::map(resource, |r| &r.cancel);
let maybe_result = receiver.recv().or_cancel(cancel).await?;
match maybe_result {
Some(Ok(value)) => Ok(Some(value)),
Some(Err(err)) => Err(err),
None => Ok(None),
}
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}