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125 lines
3.7 KiB
Rust
125 lines
3.7 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use super::dispatch_json::{Deserialize, JsonOp, Value};
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use crate::op_error::OpError;
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use crate::state::State;
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use deno_core::*;
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use futures::future::poll_fn;
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use futures::future::FutureExt;
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use notify::event::Event as NotifyEvent;
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use notify::Error as NotifyError;
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use notify::EventKind;
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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 serde::Serialize;
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use std::convert::From;
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use std::path::PathBuf;
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use tokio::sync::mpsc;
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pub fn init(i: &mut Isolate, s: &State) {
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i.register_op("op_fs_events_open", s.stateful_json_op(op_fs_events_open));
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i.register_op("op_fs_events_poll", s.stateful_json_op(op_fs_events_poll));
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}
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struct FsEventsResource {
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#[allow(unused)]
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watcher: RecommendedWatcher,
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receiver: mpsc::Receiver<Result<FsEvent, ErrBox>>,
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}
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/// Represents a file system event.
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///
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/// We do not use the event directly from the notify crate. We flatten
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/// the structure into this simpler structure. We want to only make it more
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/// complex as needed.
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///
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/// Feel free to expand this struct as long as you can add tests to demonstrate
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/// the complexity.
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#[derive(Serialize, Debug)]
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struct FsEvent {
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kind: String,
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paths: Vec<PathBuf>,
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}
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impl From<NotifyEvent> for FsEvent {
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fn from(e: NotifyEvent) -> Self {
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let kind = match e.kind {
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EventKind::Any => "any",
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EventKind::Access(_) => "access",
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EventKind::Create(_) => "create",
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EventKind::Modify(_) => "modify",
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EventKind::Remove(_) => "remove",
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EventKind::Other => todo!(), // What's this for? Leaving it out for now.
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}
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.to_string();
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FsEvent {
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kind,
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paths: e.paths,
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}
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}
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}
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pub fn op_fs_events_open(
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state: &State,
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args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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#[derive(Deserialize)]
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struct OpenArgs {
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recursive: bool,
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paths: Vec<String>,
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}
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let args: OpenArgs = serde_json::from_value(args)?;
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let (sender, receiver) = mpsc::channel::<Result<FsEvent, ErrBox>>(16);
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let sender = std::sync::Mutex::new(sender);
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let mut watcher: RecommendedWatcher =
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Watcher::new_immediate(move |res: Result<NotifyEvent, NotifyError>| {
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let res2 = res.map(FsEvent::from).map_err(ErrBox::from);
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let mut sender = sender.lock().unwrap();
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// Ignore result, if send failed it means that watcher was already closed,
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// but not all messages have been flushed.
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let _ = sender.try_send(res2);
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})
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.map_err(ErrBox::from)?;
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let recursive_mode = if args.recursive {
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RecursiveMode::Recursive
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} else {
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RecursiveMode::NonRecursive
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};
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for path in &args.paths {
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state.check_read(&PathBuf::from(path))?;
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watcher.watch(path, recursive_mode).map_err(ErrBox::from)?;
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}
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let resource = FsEventsResource { watcher, receiver };
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let table = &mut state.borrow_mut().resource_table;
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let rid = table.add("fsEvents", Box::new(resource));
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Ok(JsonOp::Sync(json!(rid)))
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}
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pub fn op_fs_events_poll(
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state: &State,
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args: Value,
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_zero_copy: Option<ZeroCopyBuf>,
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) -> Result<JsonOp, OpError> {
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#[derive(Deserialize)]
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struct PollArgs {
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rid: u32,
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}
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let PollArgs { rid } = serde_json::from_value(args)?;
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let state = state.clone();
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let f = poll_fn(move |cx| {
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let resource_table = &mut state.borrow_mut().resource_table;
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let watcher = resource_table
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.get_mut::<FsEventsResource>(rid)
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.ok_or_else(OpError::bad_resource_id)?;
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watcher
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.receiver
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.poll_recv(cx)
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.map(|maybe_result| match maybe_result {
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Some(Ok(value)) => Ok(json!({ "value": value, "done": false })),
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Some(Err(err)) => Err(OpError::from(err)),
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None => Ok(json!({ "done": true })),
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})
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});
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Ok(JsonOp::Async(f.boxed_local()))
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}
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