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// Copyright (c) 2018, 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.
const LRU = require('lru-cache'),
logger = require('../logger').logger,
fs = require('fs-extra'),
path = require('path'),
mkdirp = require('mkdirp'),
BaseCache = require('./base.js');
// With thanks to https://gist.github.com/kethinov/6658166
function getAllFiles(root, dir) {
dir = dir || root;
return fs.readdirSync(dir).reduce((files, file) => {
const fullPath = path.join(dir, file);
const name = path.relative(root, fullPath);
const isDirectory = fs.statSync(fullPath).isDirectory();
return isDirectory ? [...files, ...getAllFiles(root, fullPath)] : [...files, {name, fullPath}];
}, []);
}
class OnDiskCache extends BaseCache {
constructor(path, cacheMb) {
super(`OnDiskCache(${path}, ${cacheMb}mb)`);
this.path = path;
this.cacheMb = cacheMb;
this.cache = LRU({
max: cacheMb * 1024 * 1024,
length: n => n.size,
noDisposeOnSet: true,
dispose: (key, n) => {
fs.unlink(n.path, () => {});
}
});
mkdirp.sync(path);
const info = getAllFiles(path).map(({name, fullPath}) => {
const stat = fs.statSync(fullPath);
return {
key: name,
sort: stat.ctimeMs,
data: {
path: fullPath,
size: stat.size
}
};
});
// Sort oldest first
info.sort((x, y) => x.sort - y.sort);
for (let i of info) {
this.cache.set(i.key, i.data);
}
}
statString() {
return `${super.statString()}, LRU has ${this.cache.itemCount} item(s) ` +
`totalling ${this.cache.length} bytes on disk`;
}
async getInternal(key) {
const cached = this.cache.get(key);
if (!cached) return {hit: false};
try {
const data = await fs.readFile(cached.path);
return {hit: true, data: data};
} catch (err) {
logger.error(`error reading '${key}' from disk cache: `, err);
return {hit: false};
}
}
async putInternal(key, value) {
const info = {
path: path.join(this.path, key),
size: value.length
};
await fs.writeFile(info.path, value);
return this.cache.set(key, info);
}
}
module.exports = OnDiskCache;