New

Conditional caching

It's a common issue that you enable caching for an action but sometimes you don't want to get data from cache. To solve it you may set ctx.meta.$cache = false before calling and the cacher won't send cached responses.

Example

// Turn off caching for this request
broker.call("greeter.hello", { name: "Moleculer" }, { meta: { $cache: false }}))

Other solution is that you use a custom function which enables or disables caching for every request. The function gets the ctx Context instance so it has access any params or meta data.

Example

// greeter.service.js
module.exports = {
    name: "greeter",
    actions: {
        hello: {
            cache: {
                enabled: ctx => ctx.params.noCache !== true,
                keys: ["name"]
            },
            handler(ctx) {
                this.logger.debug(chalk.yellow("Execute handler"));
                return `Hello ${ctx.params.name}`;
            }
        }
    }
};

// Use custom `enabled` function to turn off caching for this request
broker.call("greeter.hello", { name: "Moleculer", noCache: true }))

LRU memory cacher

An LRU memory cacher has been added to the core modules. It uses the familiar lru-cache library.

Example

let broker = new ServiceBroker({ cacher: "MemoryLRU" });

let broker = new ServiceBroker({
    logLevel: "debug",
    cacher: {
        type: "MemoryLRU",
        options: {
            // Maximum items
            max: 100,
            // Time-to-Live
            ttl: 3
        }
    }
});

Changes

throw the error further in loadService method so that Runner prints the correct error stack.
new packetLogFilter transit option to filter packets in debug logs (e.g. HEARTBEAT packets) by @faeron
the Redis cacher clean & del methods handle array parameter by @dkuida
the Memory cacher clean & del methods handle array parameter by @icebob
fix to handle version: 0 as a valid version number by @ngraef

moleculerjs/moleculer v0.13.5 on GitHub

New

Conditional caching

LRU memory cacher

Changes

moleculerjs/moleculer v0.13.5
on GitHub