# E-Mail MicroService (EMS)

An Alternative Open Source to AWS SES

### Open Source Technologies

*   TypeScript
*   MongDB
*   NodeJS

### EMS Objectives

*   Import CSV Users List
*   Relationship CSV User List with TAG
*   Send automatic message for one or many TAGs

Business Rules

*   for TAGs
*   for users
*   Na importação, se a tag não existir ela deve ser criada
*   Na importação, se o usuário já existir, só vamos veicular com a tag
*   Multiples Tags per users

Integration

*   AWS SES

Infrastructure

*   MongoDB
*   Express
*   Kafka

### Requisitos Funcionais — RF

*   Importar uma lista em CSV e relacionar ela com uma tag
*   Enviar mensagem para uma ou mais tags
*   Listar inscritos em uma ou mais tag
*   Visualização do Progresso de Envio (Concluido/ não concluido)

### Requisitos Não Funcionais — RNF

*   Utilizar o Amazon SES ($1 => 10.000 emails sents)
*   Utilizar MongoDB
*   Utilizar Express
*   Serviço de Mensageria (REDIS, KAFKA)

### Regras de Negócios — RN

*   Na importação, se a TAG não existir ela deve ser criada
*   Na importação, se o usuário já existir, só vamos veicula-lo com a tag
*   A importação deve permitir múltiplas tags

### Minimum Value Product — MVP

*   1 semana

### Project Structure

*   yarn init -y
*   yarn add nodemon sucrase -D
*   yarn add express
*   **Install TypeScript**
*   yarn add typescript ts-node-dev [@types/express](http://twitter.com/types/express) -D
*   yarn add [@typescript](http://twitter.com/typescript "Twitter profile for @typescript")\-eslint/eslint-plugin -D
*   yarn add @typescript-eslint/parser -D
*   yarn add eslint -D
*   yarn add eslint-config-airbnb-base -D
*   yarn add eslint-config-prettier -D
*   yarn add eslint-import-resolver-typescript -D
*   yarn add eslint-plugin-import -D
*   yarn add eslint-plugin-prettier -D
*   yarn add prettier -D
*   yarn add tsconfig-paths -D

### Coding

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834032361/ToH6PrUCF.jpeg)

### Production Dependencies

*   yarn add mongoose
*   yarn add @types/mongoose -D

### Install MongoDB with Docker

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834034012/JcWNiKo2O.png)

*   docker pull mongo
*   docker run -d -p 27017:27017 -p 28017:28017 -e MONGODB\_PASS=”admin” mongodb
*   docker run -d -p 27017:27017 -e MONGODB\_PASS=”admin” -e MONGODB\_USER=”admin” mongo

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834035586/avRvbola1.png)

### Test Driven Development — TDD

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834036882/3TYZJsb3U.gif)

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834038406/X2ZSbTKJi.png)

*   yarn add jest -D
*   yarn add @types/jest -D
*   yarn jest — init
*   yarn add ts-jest -D

*   yarn test

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834040446/0yTXy5FCc.png)

*   yarn test — watchAll

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1662834042330/yGMTQDkhx.png)

### Functionals Tests

*   HTTP Client for Requisitions
*   Database Mock => MongoDB Fake
*   MongoDB Memory Server
*   jest-mongodb

[**GitHub - shelfio/jest-mongodb: Jest preset for MongoDB in-memory server**  
*Jest preset to run MongoDB memory server $ yarn add @shelf/jest-mongodb --dev Make sure mongodb is installed in the…*github.com](https://github.com/shelfio/jest-mongodb "https://github.com/shelfio/jest-mongodb")[](https://github.com/shelfio/jest-mongodb)

```
$ yarn add @shelf/jest-mongodb --dev
```

Jest with MongoDB Setup

[**Using with MongoDB · Jest**  
*With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with MongoDB.*jestjs.io](https://jestjs.io/pt-BR/docs/mongodb "https://jestjs.io/pt-BR/docs/mongodb")[](https://jestjs.io/pt-BR/docs/mongodb)