feat(tvix/eval): add file_type method

This allows peeking of the type at a given path.

It's necessary, as an open() might not fail until you try to read()
from it, and generally, stat'ing can be faster in some cases.

Change-Id: Ib002da3194a3546ca286de49aac8d1022ec5560f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11871
Tested-by: BuildkiteCI
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
This commit is contained in:
Florian Klink 2024-06-25 20:37:43 +03:00 committed by flokli
parent 04f04cfc27
commit 080654aaf9
3 changed files with 51 additions and 0 deletions

View file

@ -54,6 +54,10 @@ pub trait EvalIO {
/// Open the file at the specified path to a `io::Read`.
fn open(&self, path: &Path) -> io::Result<Box<dyn io::Read>>;
/// Return the [FileType] of the given path, or an error if it doesn't
/// exist.
fn file_type(&self, path: &Path) -> io::Result<FileType>;
/// Read the directory at the specified path and return the names
/// of its entries associated with their [`FileType`].
///
@ -101,6 +105,20 @@ impl EvalIO for StdIO {
Ok(Box::new(File::open(path)?))
}
fn file_type(&self, path: &Path) -> io::Result<FileType> {
let file_type = File::open(path)?.metadata()?.file_type();
Ok(if file_type.is_dir() {
FileType::Directory
} else if file_type.is_file() {
FileType::Regular
} else if file_type.is_symlink() {
FileType::Symlink
} else {
FileType::Unknown
})
}
fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
let mut result = vec![];
@ -150,6 +168,13 @@ impl EvalIO for DummyIO {
))
}
fn file_type(&self, _: &Path) -> io::Result<FileType> {
Err(io::Error::new(
io::ErrorKind::Unsupported,
"I/O methods are not implemented in DummyIO",
))
}
fn read_dir(&self, _: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
Err(io::Error::new(
io::ErrorKind::Unsupported,

View file

@ -60,6 +60,10 @@ where
self.actual.as_ref().open(path)
}
fn file_type(&self, path: &Path) -> io::Result<FileType> {
self.actual.as_ref().file_type(path)
}
fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
self.actual.as_ref().read_dir(path)
}

View file

@ -531,6 +531,28 @@ impl EvalIO for TvixStoreIO {
}
}
#[instrument(skip(self), ret(level = Level::TRACE), err)]
fn file_type(&self, path: &Path) -> io::Result<FileType> {
if let Ok((store_path, sub_path)) =
StorePath::from_absolute_path_full(&path.to_string_lossy())
{
if let Some(node) = self
.tokio_handle
.block_on(async { self.store_path_to_node(&store_path, &sub_path).await })?
{
match node {
Node::Directory(_) => Ok(FileType::Directory),
Node::File(_) => Ok(FileType::Regular),
Node::Symlink(_) => Ok(FileType::Symlink),
}
} else {
self.std_io.file_type(path)
}
} else {
self.std_io.file_type(path)
}
}
#[instrument(skip(self), ret(level = Level::TRACE), err)]
fn read_dir(&self, path: &Path) -> io::Result<Vec<(bytes::Bytes, FileType)>> {
if let Ok((store_path, sub_path)) =