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feat(fs): new fs module to replace filesystem

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Paul Campbell 2024-04-27 20:31:23 +01:00
parent 36070f59cc
commit 2e3827e0e0
9 changed files with 182 additions and 20 deletions
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3
Cargo.toml
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@ -31,6 +31,9 @@ thiserror = "1.0"
# fs
tempfile = "3.10"
# error handling
derive_more = { version = "1.0.0-beta.6", features = ["from", "display"] }
[dev-dependencies]
# testing
assert2 = "0.3"

39
README.md
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@ -13,26 +13,25 @@ There are two FileSystem implementation: [filesystem] and [fs].
#### std::fs alternatives
| To Do | [std::fs] | [kxio::fs] | |
| ----- | ---------------- | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| [ ] | canonicalize | path::canonicalize | Returns the canonical, absolute form of a path with all intermediate components normalized and symbolic links resolved. |
| [ ] | copy | file::copy | Copies the contents of one file to another. This function will also copy the permission bits of the original file to the destination file. |
| [ ] | create_dir | dir::create | Creates a new, empty directory at the provided path |
| [ ] | create_dir_all | dir::create_all | Recursively create a directory and all of its parent components if they are missing. |
| [ ] | hard_link | link::create | Creates a new hard link on the filesystem. |
| [ ] | metadata | path::metadata | Given a path, query the file system to get information about a file, directory, etc. |
| [ ] | read | file::read | Read the entire contents of a file into a bytes vector. |
| [ ] | read_dir | dir::read | Returns an iterator over the entries within a directory. |
| [ ] | read_link | link::read | Reads a symbolic link, returning the file that the link points to. |
| [ ] | read_to_string | file::read_to_string | Read the entire contents of a file into a string. |
| [ ] | remove_dir | dir::remove | Removes an empty directory. |
| [ ] | remove_dir_all | dir::remove_all | Removes a directory at this path, after removing all its contents. Use carefully! |
| [ ] | remove_file | file::remove | Removes a file from the filesystem. |
| [ ] | rename | path::rename | Rename a file or directory to a new name, replacing the original file if to already exists. |
| [ ] | set_permissions | path::set_permissions | Changes the permissions found on a file or a directory. |
| [ ] | symlink_metadata | link::metadata | Query the metadata about a file without following symlinks. |
| [ ] | write | file::write | Write a slice as the entire contents of a file. |
| [ ] | try_exists | path::exists | Returns Ok(true) if the path points at an existing entity. |
| To Do | [std::fs] | [kxio::fs::FileSystem] | |
| ----- | ---------------- | ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| [ ] | canonicalize | path_canonicalize | Returns the canonical, absolute form of a path with all intermediate components normalized and symbolic links resolved. |
| [ ] | copy | file_copy | Copies the contents of one file to another. This function will also copy the permission bits of the original file to the destination file. |
| [ ] | create_dir | dir_create | Creates a new, empty directory at the provided path |
| [ ] | create_dir_all | dir_create_all | Recursively create a directory and all of its parent components if they are missing. |
| [ ] | hard_link | link_create | Creates a new hard link on the filesystem. |
| [ ] | metadata | path_metadata | Given a path, query the file system to get information about a file, directory, etc. |
| [ ] | read | file_read | Read the entire contents of a file into a bytes vector. |
| [ ] | read_dir | dir_read | Returns an iterator over the entries within a directory. |
| [ ] | read_link | link_read | Reads a symbolic link, returning the file that the link points to. |
| [x] | read_to_string | file_read_to_string | Read the entire contents of a file into a string. |
| [ ] | remove_dir | dir_remove | Removes an empty directory. |
| [ ] | remove_dir_all | dir_remove_all | Removes a directory at this path, after removing all its contents. Use carefully! |
| [ ] | remove_file | file_remove | Removes a file from the filesystem. |
| [ ] | rename | path_rename | Rename a file or directory to a new name, replacing the original file if to already exists. |
| [ ] | set_permissions | path_set_permissions | Changes the permissions found on a file or a directory. |
| [ ] | symlink_metadata | link_metadata | Query the metadata about a file without following symlinks. |
| [x] | write | file_write | Write a slice as the entire contents of a file. |
### Network

3
src/filesystem.rs
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@ -1,3 +1,5 @@
#![allow(deprecated)]
use std::{
ops::Deref,
path::PathBuf,
@ -16,6 +18,7 @@ pub fn temp() -> std::io::Result<FileSystem> {
}
#[derive(Clone, Debug)]
#[deprecated(since = "1.1.0", note = "Use [kxio::fs::FileSystem] instead")]
pub enum FileSystem {
Real(RealFileSystem),
Temp(TempFileSystem),

50
src/fs/mod.rs Normal file
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@ -0,0 +1,50 @@
use std::path::{Path, PathBuf};
use derive_more::From;
mod real;
mod temp;
#[derive(Debug, From, derive_more::Display)]
pub enum Error {
Io(std::io::Error),
#[display("Path access attempted outside of base ({base:?}): {path:?}")]
PathTraversal {
base: PathBuf,
path: PathBuf,
},
}
pub type Result<T> = core::result::Result<T, Error>;
pub const fn new(base: PathBuf) -> FileSystem {
FileSystem::Real(real::new(base))
}
pub fn temp() -> Result<FileSystem> {
temp::new().map(FileSystem::Temp)
}
pub enum FileSystem {
Real(real::RealFileSystem),
Temp(temp::TempFileSystem),
}
impl std::ops::Deref for FileSystem {
type Target = dyn FileSystemLike;
fn deref(&self) -> &Self::Target {
match self {
Self::Real(fs) => fs,
Self::Temp(fs) => fs.deref(),
}
}
}
pub trait FileSystemLike {
fn base(&self) -> &Path;
fn path_of(&self, path: PathBuf) -> Result<PathBuf>;
fn file_write(&self, path: &Path, contents: &str) -> Result<()>;
fn file_read_to_string(&self, path: &Path) -> Result<String>;
fn path_exists(&self, path: &Path) -> Result<bool>;
fn path_is_file(&self, path: &Path) -> Result<bool>;
}

52
src/fs/real.rs Normal file
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@ -0,0 +1,52 @@
use std::path::{Path, PathBuf};
pub const fn new(base: PathBuf) -> RealFileSystem {
RealFileSystem { base }
}
pub struct RealFileSystem {
base: PathBuf,
}
impl super::FileSystemLike for RealFileSystem {
fn base(&self) -> &Path {
&self.base
}
fn path_of(&self, path: PathBuf) -> super::Result<PathBuf> {
let path_of = self.base.as_path().join(path);
self.validate(&path_of)?;
Ok(path_of)
}
fn file_write(&self, path: &Path, contents: &str) -> super::Result<()> {
self.validate(path)?;
std::fs::write(path, contents).map_err(Into::into)
}
fn file_read_to_string(&self, path: &Path) -> super::Result<String> {
self.validate(path)?;
std::fs::read_to_string(path).map_err(Into::into)
}
fn path_is_file(&self, path: &Path) -> super::Result<bool> {
self.validate(path)?;
Ok(path.is_file())
}
fn path_exists(&self, path: &Path) -> super::Result<bool> {
self.validate(path)?;
Ok(path.exists())
}
}
impl RealFileSystem {
fn validate(&self, path: &std::path::Path) -> super::Result<()> {
if !path.starts_with(&self.base) {
return Err(super::Error::PathTraversal {
base: self.base.clone(),
path: path.to_path_buf(),
});
}
Ok(())
}
}

28
src/fs/temp.rs Normal file
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@ -0,0 +1,28 @@
use std::sync::{Arc, Mutex};
use tempfile::TempDir;
pub(super) fn new() -> super::Result<TempFileSystem> {
let temp_dir = tempfile::tempdir()?;
let base = temp_dir.path().to_path_buf();
let temp_dir = Arc::new(Mutex::new(temp_dir));
let real = super::real::new(base);
Ok(TempFileSystem {
real,
_temp_dir: temp_dir,
})
}
pub struct TempFileSystem {
real: super::real::RealFileSystem,
_temp_dir: Arc<Mutex<TempDir>>,
}
impl std::ops::Deref for TempFileSystem {
type Target = dyn super::FileSystemLike;
fn deref(&self) -> &Self::Target {
&self.real
}
}

4
src/lib.rs
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@ -1,5 +1,9 @@
#[cfg(feature = "fs")]
pub mod filesystem;
#[cfg(feature = "fs")]
pub mod fs;
#[cfg(feature = "network")]
pub mod network;

20
src/tests/fs.rs Normal file
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@ -0,0 +1,20 @@
use std::path::PathBuf;
use crate::fs;
type TestResult = Result<(), crate::fs::Error>;
#[test]
fn write_read_file_exists() -> TestResult {
let temp_fs = fs::temp()?;
let name: PathBuf = temp_fs.path_of("foo".into())?;
temp_fs.file_write(&name, "content")?;
let c = temp_fs.file_read_to_string(&name)?;
assert_eq!(c, "content");
let exists = temp_fs.path_exists(&name)?;
assert!(exists);
let is_file = temp_fs.path_is_file(&name)?;
assert!(is_file);
Ok(())
}

3
src/tests/mod.rs
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@ -1,5 +1,8 @@
#[cfg(feature = "fs")]
pub mod filesystem;
#[cfg(feature = "fs")]
pub mod fs;
// #[cfg(feature = "network")]
// pub mod network;