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temp.ts
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// Copyright (c) 2025, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import {logger} from './logger.js';
import * as utils from './utils.js';
const pendingRemoval: string[] = [];
export type Stats = {
numCreated: number;
numActive: number;
numRemoved: number;
numAlreadyGone: number;
};
const stats = {
numCreated: 0,
numRemoved: 0,
numAlreadyGone: 0,
};
/**
* Get the current stats for temporary directories.
*/
export function getStats(): Stats {
return {
...stats,
numActive: pendingRemoval.length,
};
}
// Reset stats, for tests only.
export function resetStats() {
stats.numCreated = 0;
stats.numRemoved = 0;
stats.numAlreadyGone = 0;
}
/**
* Create a temporary directory, always in the operating systems' temporary directory.
* @param prefix a prefix for the directory name
*/
export async function mkdir(prefix: string) {
const result = await fs.promises.mkdtemp(path.join(os.tmpdir(), prefix));
++stats.numCreated;
pendingRemoval.push(result);
return result;
}
/**
* Synchronously create a temporary directory, always in the operating systems' temporary directory.
* @param prefix a prefix for the directory name
*/
export function mkdirSync(prefix: string) {
const result = fs.mkdtempSync(path.join(os.tmpdir(), prefix));
++stats.numCreated;
pendingRemoval.push(result);
return result;
}
/**
* Remove all temporary directories created by this module.
*/
export async function cleanup() {
// "Atomically" take a copy of the things to remove and set it to an empty array.
const toRemove = pendingRemoval.splice(0, pendingRemoval.length);
let numRemoved = 0;
let numAlreadyGone = 0;
for (const dir of toRemove) {
if (!(await utils.dirExists(dir))) {
++stats.numAlreadyGone;
++numAlreadyGone;
continue;
}
try {
await fs.promises.rm(dir, {recursive: true, force: true});
++numRemoved;
++stats.numRemoved;
} catch (e) {
logger.error(`Failed to remove ${dir}: ${e}`);
}
}
logger.debug(`Removed ${numRemoved} (${numAlreadyGone} already gone) of ${toRemove.length} temporary directories`);
}
process.on('exit', async () => {
await cleanup();
});