mapycz-api/dist/cache.js

mapy.cz fastrpc and REST interfaces

import * as fs from 'fs';
import * as fsp from 'fs/promises';
import { md5 } from 'js-md5';
import path from 'path';
import logger from './logger.js';
export class Cache {
    key(obj) {
        return md5(JSON.stringify(obj));
    }
    is(_key) {
        return false;
    }
    async get(_key) { }
    async set(_key, _value) { }
}
export class InMemoryCache extends Cache {
    constructor() {
        super();
        this.store = {};
    }
    is(key) {
        return key in this.store;
    }
    async get(key) {
        return this.store[key];
    }
    async set(key, value) {
        this.store[key] = value;
    }
}
export class FileCache extends Cache {
    constructor(cachePath = 'cache') {
        super();
        this.cachePath = cachePath;
        if (!fs.existsSync(cachePath))
            throw Error(`cache path:${cachePath} doesn't exist`);
    }
    is(key) {
        return fs.existsSync(this.path(key));
    }
    path(key) {
        return path.join(this.cachePath, key);
    }
    async get(key) {
        logger.debug({ key }, 'cache read');
        const buffer = await fsp.readFile(this.path(key), 'utf8');
        return JSON.parse(buffer);
    }
    async set(key, value) {
        logger.debug({ key }, 'cache write');
        return fsp.writeFile(this.path(key), JSON.stringify(value));
    }
}
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