The document discusses the microservices architecture, its benefits such as faster deployments and improved fault isolation, and drawbacks like increased network communication and complexity. It introduces SenecaJS, a framework for building microservices, and demonstrates its use with RabbitMQ and AMQP transport. Additionally, it highlights key factors to consider when building a microservices system, as well as a package called 'servicebase' that offers multiple functionalities and configuration options.

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MICROSERVICES WITH SENECAJS
Trung 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 Architecture
The 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 microservice
var 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-transport
https://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 code
var 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 B
NGINX–LoadBalancer
GatewayAPI1GatewayAPI2
RabbitMQ
Configuration Storage & Health Checker
Postgresql
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&A
Thank you very much