Memoize mixin for Moleculer services

README.md

Memoize mixin for Moleculer services

Add caching for Moleculer service methods too. This mixin creates a memoize method which caches responses in service methods.

Usage

const Memoize = require("../mixins/memoize.mixin");

module.exports = {
    name: "acl",

    mixins: [
        Memoize()
    ],

    methods: {
        async getPermissions(roleNames) {
            return await this.memoize("permissions", roleNames, async () => {
                // Do something. The response will be cached based on `roleNames` value.

                return res;
            });
        },        
    }
}

memoize.mixin.js

"use strict";

module.exports = function(opts = {}) {
    return {
        methods: {
            async memoize(name, params, fn) {
                if (!this.broker.cacher) return fn();

                const key = this.broker.cacher.defaultKeygen(`${this.name}:memoize-${name}`, params, {});

                let res = await this.broker.cacher.get(key);
                if (res)
                    return res;

                res = await fn();
                this.broker.cacher.set(key, res, opts.ttl);

                return res;
            }
        }
    };
};