116 lines
3.4 KiB
Rust
116 lines
3.4 KiB
Rust
//! Rustdoc's FileSystem abstraction module.
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//!
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//! On Windows this indirects IO into threads to work around performance issues
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//! with Defender (and other similar virus scanners that do blocking operations).
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//! On other platforms this is a thin shim to fs.
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//!
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//! Only calls needed to permit this workaround have been abstracted: thus
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//! fs::read is still done directly via the fs module; if in future rustdoc
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//! needs to read-after-write from a file, then it would be added to this
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//! abstraction.
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use errors;
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use std::fs;
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use std::io;
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use std::path::Path;
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use std::sync::Arc;
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use std::sync::mpsc::{channel, Receiver, Sender};
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macro_rules! try_err {
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($e:expr, $file:expr) => {{
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match $e {
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Ok(e) => e,
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Err(e) => return Err(E::new(e, $file)),
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}
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}};
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}
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pub trait PathError {
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fn new<P: AsRef<Path>>(e: io::Error, path: P) -> Self;
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}
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pub struct ErrorStorage {
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sender: Option<Sender<Option<String>>>,
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receiver: Receiver<Option<String>>,
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}
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impl ErrorStorage {
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pub fn new() -> ErrorStorage {
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let (sender, receiver) = channel();
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ErrorStorage {
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sender: Some(sender),
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receiver,
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}
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}
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/// Prints all stored errors. Returns the number of printed errors.
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pub fn write_errors(&mut self, diag: &errors::Handler) -> usize {
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let mut printed = 0;
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// In order to drop the sender part of the channel.
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self.sender = None;
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for msg in self.receiver.iter() {
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if let Some(ref error) = msg {
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diag.struct_err(&error).emit();
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printed += 1;
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}
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}
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printed
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}
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}
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pub struct DocFS {
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sync_only: bool,
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errors: Arc<ErrorStorage>,
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}
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impl DocFS {
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pub fn new(errors: &Arc<ErrorStorage>) -> DocFS {
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DocFS {
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sync_only: false,
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errors: Arc::clone(errors),
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}
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}
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pub fn set_sync_only(&mut self, sync_only: bool) {
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self.sync_only = sync_only;
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}
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pub fn create_dir_all<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
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// For now, dir creation isn't a huge time consideration, do it
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// synchronously, which avoids needing ordering between write() actions
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// and directory creation.
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fs::create_dir_all(path)
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}
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pub fn write<P, C, E>(&self, path: P, contents: C) -> Result<(), E>
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where
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P: AsRef<Path>,
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C: AsRef<[u8]>,
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E: PathError,
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{
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if !self.sync_only && cfg!(windows) {
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// A possible future enhancement after more detailed profiling would
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// be to create the file sync so errors are reported eagerly.
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let contents = contents.as_ref().to_vec();
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let path = path.as_ref().to_path_buf();
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let sender = self.errors.sender.clone().unwrap();
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rayon::spawn(move || {
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match fs::write(&path, &contents) {
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Ok(_) => {
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sender.send(None)
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.expect(&format!("failed to send error on \"{}\"", path.display()));
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}
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Err(e) => {
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sender.send(Some(format!("\"{}\": {}", path.display(), e)))
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.expect(&format!("failed to send non-error on \"{}\"", path.display()));
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}
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}
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});
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Ok(())
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} else {
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Ok(try_err!(fs::write(&path, contents), path))
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}
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}
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}
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