beems

beems (formerly dot-bee)

a bee-queue based minimalist toolkit for building fast, decentralized, scalable and fault tolerant microservices

Install

npm i --save beems

You can also clone this repository and make use of it yourself.

git clone https://github.com/umuplus/beems.git
cd beems
npm i
npm test

Before running tests, please make sure that you have Redis available on localhost. If you don't know how to do that temporarily, please use following command to run it via docker.

docker run -p 6379:6379 --name beems_redis redis:4-alpine

Configuration

• bee: options for initializing a bee queue instance. please see more details at Bee Queue Settings.
• job: options for creating a bee queue job. only setId, retries, backoff, delayUntil and timeout methods allowed. please see more details at Bee Queue Job Settings.
• on: event handlers for server. please see more details at Queue Local Events
• pino: options for pino logger. it's { "level": "error" } by default.

Server Methods

• .addServices(services, concurrency = cpus().length, options): adds list of services and automatically creates their queues and consumers
• .addService(service, concurrency = cpus().length, options): adds a new service and automatically creates related queue and its consumer
• .close(): stops all existing queues for a clean shutdown
• .destroy(): removes everything about existing queues from redis

Client Methods

• .acceptServices(services, options): accepts existing services to send jobs
• .acceptService(service, options): accepts an existing service to send jobs
• .forward(service, method, data, options): sends a new job to an existing service and returns a Job instance
• .health(service): returns number of jobs for each state
• .job(service, id): returns an existing Job by id
• .send(service, method, data, options): sends a new job to an existing service and retrieves its response
• .close(): stops all existing queues for a clean shutdown

Examples

const { Client, Service, Server } = require('beems');
const { cpus } = require('os');
 
class TestService extends Service {
    async echo(job) {
        return job.data;
    }
}
 
const client = new Client();
const server = new Server({
    on: { failed: (j, e) => server.logger.error(j.id, e.message) }
});
server.addServices([ new TestService('test') ], cpus().length);
client.acceptServices([ 'test' ]);
 
try {
    const data = { t: Date.now() };
    const { job, response } = await client.send('test', 'echo', data);
    console.log(job.id, response);
} catch({ job, error: e }) {
    console(job.id, e.message);
}
 
await client.close();
await server.destroy();
await server.close();

Optional Job Configuration

please see more details at Bee Queue Job Settings.

await client.send('test', 'echo', { t: Date.now() }, {
    setId: 'my-custom-job-id',
    retries: 2,
    backoff: [ 'fixed', 1000 ],
    delayUntil: Date.parse('2082-08-23T00:00:01.000Z'),
    timeout: 10000
});

TODO

• Add some useful logs