openethereum/devtools/src/random_path.rs

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// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Random path
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use std::path::*;
use std::fs;
use std::env;
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use std::ops::{Deref, DerefMut};
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use rand::random;
pub struct RandomTempPath {
path: PathBuf
}
pub fn random_filename() -> String {
random_str(8)
}
pub fn random_str(len: usize) -> String {
(0..len).map(|_| ((random::<f32>() * 26.0) as u8 + 97) as char).collect()
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}
impl RandomTempPath {
pub fn new() -> RandomTempPath {
let mut dir = env::temp_dir();
dir.push(random_filename());
RandomTempPath {
path: dir.clone()
}
}
pub fn create_dir() -> RandomTempPath {
let mut dir = env::temp_dir();
dir.push(random_filename());
fs::create_dir_all(dir.as_path()).unwrap();
RandomTempPath {
path: dir.clone()
}
}
pub fn as_path(&self) -> &PathBuf {
&self.path
}
pub fn as_str(&self) -> &str {
self.path.to_str().unwrap()
}
pub fn new_in(&self, name: &str) -> String {
let mut path = self.path.clone();
path.push(name);
path.to_str().unwrap().to_owned()
}
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}
impl Drop for RandomTempPath {
fn drop(&mut self) {
if let Err(e) = fs::remove_dir_all(self.as_path()) {
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panic!("Failed to remove temp directory. Here's what prevented this from happening: ({})", e);
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}
}
}
pub struct GuardedTempResult<T> {
pub result: Option<T>,
pub _temp: RandomTempPath
}
impl<T> GuardedTempResult<T> {
pub fn reference(&self) -> &T {
self.result.as_ref().unwrap()
}
pub fn reference_mut(&mut self) -> &mut T {
self.result.as_mut().unwrap()
}
pub fn take(&mut self) -> T {
self.result.take().unwrap()
}
}
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impl<T> Deref for GuardedTempResult<T> {
type Target = T;
fn deref(&self) -> &T { self.result.as_ref().unwrap() }
}
impl<T> DerefMut for GuardedTempResult<T> {
fn deref_mut(&mut self) -> &mut T { self.result.as_mut().unwrap() }
}
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#[test]
fn creates_dir() {
let temp = RandomTempPath::create_dir();
assert!(fs::metadata(temp.as_path()).unwrap().is_dir());
}
#[test]
fn destroys_dir() {
let path_buf = {
let temp = RandomTempPath::create_dir();
assert!(fs::metadata(temp.as_path()).unwrap().is_dir());
let path_buf = temp.as_path().to_path_buf();
path_buf
};
assert!(fs::metadata(&path_buf).is_err());
}
#[test]
fn provides_random() {
let temp = RandomTempPath::create_dir();
assert!(temp.as_path().to_str().is_some());
}