microservices with senecajs

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MICROSERVICES WITH SENECAJSTrung Dang

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Agenda What is microservices? Factors affect when building up the system with

microservices Introducing SenecaJS SenecaJS with RabbitMQ Integrate with Consul, RabbitMQ Talk is cheap – Show me the code ------ DEMO TIME Q/A

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What is Microservices?

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Monolithic Application Model

1. How to scale this application to serve more customer requests?

2. The Payments Module is taking very long time to process the requests. Is there any solution with cheap cost?

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Introducing Microservices ArchitectureThe Benefits of Microservices• Faster and simpler deployments and rollbacks• Elimination of long-term commitment to a

single technology stack• Improved fault isolation• Independently scalable services• Technology diversity• Ability to write new features as plugins

The Drawbacks of Microservices• Increased network communication• Serialization between microservices• Additional complexity in testing a distributed

system• Increased complexity in deployment

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Scaling an application – The Art Of Scalability

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Main factors need to review when building up microservices system? API Gateway OR Direct Client to Microservice Communication Stateless / Stateful Invoking / Consuming service’s action Serialization between microservices Service Discovery Transaction Eventual consistency CI / CD, configuration deployment Service Health check

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Introducing SenecaJS

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Who’s using it

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SenecaJS Philosophy

• Pattern Matching: instead of fragile service discovery, you just let the world know what sort of messages you are about.

• Transport Independence: you can send messages between services in many ways, all hidden from your business logic.

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SenecaJS – First microservicevar seneca = require('seneca')()

seneca.add('role:math,cmd:sum', (msg, reply) => { reply(null, { answer: (msg.left + msg.right) }) })

seneca.act({ role: 'math', cmd: 'sum', left: 1, right: 2 }, (err, result) => {

if (err) return console.error(err) console.log(result) })

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SenecaJS with AMQP Transport

• seneca-amqp-transporthttps://github.com/seneca-contrib/seneca-amqp-transport• It is a plugin to allow seneca listeners and clients to communicate

over AMQP• Currently support AMQP 0.9.1• For AMQP 1.0, please use seneca-servicebus-transport• It use customized RPC (Remote Procedure Call) to implement the

transportation.

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SenecaJS with AMQP Transport – Show me the codevar seneca = require('seneca')() .use('seneca-amqp-transport') .add('role:create,foo:1', function (args, done) { console.log(“Server: with i = " + args.zed); done(null, { zed: args.zed, bar: args.zed + 1}) }) .listen({

type: 'amqp', pin: ‘module:test', url: 'amqp://trungdt:123absoft.vn@pm.absoft.vn:5672’ });

var client = seneca .client({ type: 'amqp', pin: ‘module:test’ url: 'amqp://trungdt:123absoft.vn@pm.absoft.vn:5672’ });

for (var i = 0; i < 10; i++) { client.act('role:create,foo:1,zed:' + i , function (err, ret) { console.log(‘Client: with i = ‘ + ret.zed); });}

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SenecaJS with AMQP Transport – How it works

Routing by topic: module:test Consumer Queue

Individual Queue created by each Client

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Microservices using SenecaJS, RabbitMQ, Consul, SequelizeJS and FeathersJS

servicebase

Database Models

Service Logic

Service BNGI

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itMQ

Configuration Storage & Health Checker

Post

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ql

Docker

servicebase

Database Models

Service Logic

Service A

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Introducing package servicebase

https://bitbucket.org/trungdang_apium/microservices_servicebase

Features :• Listener / Client mode, with AMQP Transport or HTTP Transport• Promisify all functions• Use Consul as Configuration Storage & Service Health Checher• Support multiple database adapters (Sequelize). Postgresql & Sqlite are build-in support• Loggly logs monitoring• Support Authorization when consuming the service’s action• Error handler: no more terminating your service because of TIMEOUT or fatal$ error• Including unit-test helper• Including typed-definitions file

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Show Me Your Code

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Q&AThank you very much