WILD microSERVICES

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@tolkv

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@aatarasoff

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WILD microSERVICES

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DISCLAIMER

No warranty guarantee

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Agenda

1. Theory

2. Practice

3. Q&A

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Ball of Mud

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SOA Principles1. standardized service contract

2. loose coupling

3. encapsulation

4. reusability

5. autonomy

6. statelessness

7. discoverability11

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Никто не любит “некрасивые” технологии

поэтому они умирают

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Про тренды

In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.

-- James Lewis and Martin Fowler

Что такое микросервисы?

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In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.

-- James Lewis and Martin Fowler

Что такое микросервисы?

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Размер имеет значение?

● Method/Function = Microservice?

● 10-300 LOC = Microservice?

● 1 week = Microservice?

● 1 developer = Microservice?

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Размер не имеет значения*

● Single Responsibility

● One capability

● Bounded context

“In your organization, you should be thinking not in terms of data that is shared, but about the capabilities those contexts provide the rest of the domain.”– Sam Newman, Building Microservices

*до разумных пределов конечно19

Domain-Driven Design

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In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.

-- James Lewis and Martin Fowler

Что такое микросервисы?

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Process segregation

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In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.

-- James Lewis and Martin Fowler

Что такое микросервисы?

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Независимый деплой

build test

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In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.

-- James Lewis and Martin Fowler

Что такое микросервисы?

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Language/technology segregation

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Data segregation

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Team segregation

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Принцип LSD

- L языков программирования- S в среднем фреймворков на язык- D типов источников данных

complexity = L * S * D

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Пример

- три языка программирования- два в среднем фреймворка на язык- семь типов источников данных

- legacy WS, mongo db- хранимые процедуры, JDBC-templates- elasticsearch, neo4j- мишкина база

complexity = 3 * 2 * 7 = 42 (!)30

Чем нельзя жертвовать?

min (L * S * D) -> ?

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Закон трёх букв

min (L * S * D) -> max (D)

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Почему Spring Boot/Spring Cloud?

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А теперь попробуем

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Demo

Demo -> Deploy Time

Service Discovery

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Demo -> Time to Discover

Где мой порт?

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Какие есть варианты?

● Nginx/Haproxy + consul template

● Haproxy + bamboo (need marathon)

● Netflix Zuul (Java way!!!)

● Custom Servlet <- все с этого начинают!

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Netflix Zuul

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Demo -> Gateway Time

Безопасность

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Защита на уровне сервиса

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Защита на уровне сервиса #2

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Опять этот gateway

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REST/HTTP

Authorization: Bearer <TOKEN>ClientID: <ID>

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Thrift API Gateway

service InternalTestService {

SomeReturnData getSomeData(

1: UserData userData,

2: RequestData requestData

) throws (1: SomeException e);

}

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Thrift API Gateway

service InternalTestService {

SomeReturnData getSomeData(

1: UserData userData,

2: RequestData requestData

) throws (1: SomeException e);

}

service ExternalTestService {

SomeReturnData getSomeData(

1: AuthToken authData,

2: RequestData requestData

) throws (1: SomeException e,

99: UnauthorizedException ue);

}

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Springway@SpringBootApplication@EnableThriftGatewaypublic class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); }}

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Demo -> Thrift the Ripper

Demo -> Hystrix the Saviour

Типичная микросервисная архитектура

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А что в этих ваших интернетах?

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DDDD (4D)

Выводы

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● Микросервисы - это просто

Выводы

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● Микросервисы - это просто

● Микросервисы - это сложно

Парадокс (де)централизации микросервисов

Чтобы эффективно работать с распределенными приложениями, нужно иметь очень хорошие

централизованные библиотеки/инструменты

Например: логирование, health-чеки, метрики, обработку программных ошибок

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Парадокс (де)централизации микросервисов

Чтобы эффективно работать с распределенными приложениями, нужно иметь очень хорошие

централизованные библиотеки/инструменты

Но: не выносите бизнес-логику или доменные объекты

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LSD вам в помощь

min (L * S * D) -> max (D)

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СсылкиОригинальное исполнение

https://github.com/bsideup/thrift-spring-boot-starter

Крутой плагин для Gradle

https://github.com/bsideup/GradleThrift

Forward2Dockerhttps://github.com/bsideup/forward2docker/releases

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@bsideup

Code. Better. Together.Spring Thrift Clienthttps://github.com/aatarasoff/spring-thrift-starter

Thrift API Gatewayhttps://github.com/aatarasoff/thrift-api-gateway-corehttps://github.com/aatarasoff/spring-thrift-api-gateway

Примеры сегодняшнего дняhttps://github.com/lavcraft/jug-samples

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Высокие теории

Sam Newman “Building Microservices”

Martin Fowler “Microservice TradeOff” “Microservices”

“The Twelwe-Factor App” http://12factor.net

Hystrix: managing failures in distributed systems - Tomasz Nurkiewicz https:

//www.youtube.com/watch?v=JadVts_prtA

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Спасибо! Готовы ответить на ваши вопросы

@tolkv

@aatarasoff

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