81 lines
2.1 KiB
JavaScript
81 lines
2.1 KiB
JavaScript
import fsSyncOriginal from 'fs'
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import fsPromisesOriginal from 'fs/promises'
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import crypto from 'crypto'
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import path from 'path'
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import os from 'os'
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export default class FSCache {
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constructor(options = {}, fsSync, fsPromises) {
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this.fsSync = fsSync || fsSyncOriginal
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this.fsPromises = fsPromises || fsPromisesOriginal
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this.id = crypto.randomBytes(15).toString('base64').replace(/\//g, '-')
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this.parse_json = options.parse_json ?? true
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this.prefix = options.prefix ? options.prefix + '-' : ''
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this.hash_alg = options.hash_alg || 'md5'
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this.cache_dir = options.cache_dir || path.join(os.tmpdir(), this.id)
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// Verify hash algorithm is supported on this system
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crypto.createHash(this.hash_alg)
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this.fsSync.mkdirSync(this.cache_dir, { recursive: true })
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}
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_parseCacheData(data, overwrite = {}) {
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return overwrite.parse_json ?? this.parse_json ? JSON.parse(data) : data
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}
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_parseSetData(data, overwrite = {}) {
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return overwrite.parse_json ?? this.parse_json ? JSON.stringify(data) : data
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}
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hash(name) {
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return crypto.hash(this.hash_alg, name)
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}
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get(name, fallback, opts) {
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return this.fsPromises.readFile(
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path.join(this.cache_dir, this.hash(name)),
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{ encoding: 'utf8' }
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)
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.then(
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data => this._parseCacheData(data, opts),
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err => (fallback)
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)
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}
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getSync(name, fallback, opts) {
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let data;
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try {
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data = this.fsSync.readFileSync(
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path.join(this.cache_dir, this.hash(name)),
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{ encoding: 'utf8' }
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)
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} catch {
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return fallback
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}
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return this._parseCacheData(data, opts)
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}
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set(name, data, opts = {}) {
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try {
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return this.fsPromises.writeFile(
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path.join(this.cache_dir, this.hash(name)),
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this._parseSetData(data, opts),
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{ encoding: opts.encoding || 'utf8' }
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)
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} catch (err) {
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return Promise.reject(err)
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}
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}
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setSync(name, data, opts = {}) {
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this.fsSync.writeFileSync(
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path.join(this.cache_dir, this.hash(name)),
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this._parseSetData(data, opts),
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{ encoding: opts.encoding || 'utf8' }
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)
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}
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}
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