sanar-ms

Framework to create Sanar Microservices. With this library you are able to quickly create a extensible microservice following the standards adopted by Sanar.

Features:

• Setup Express Server: Quickly setup all API server
• Logger: Pretty logging with multiple transports
• Env Vars: Assert and Validate environment variables
• Healthcheck: Customize how we know the service is health
• Database Integration: Create and assert database connection
• API Validator: Validating request body/queries/cookies/headers
• API Pagination: Standardization of pagination in API

---

Basic Usage

 
import * as SanarMS from 'sanar-ms';
 
const ms = new SanarMS({
  name: 'questions',
});
 
ms.app.get('/hello', (req, res) => {
  res.json({ hello: 'world' });
});
 
ms.listen();
 

Documentation

Full options example

const opts = {
  name: 'my-service',
  middlewares: {
    push: [],
    unshift: [],
    overwrite: [],
  },
  logger: {
    transports: [
      new winston.transports.Console(),
    ],
    silent: false,
    level: 'info',
  },
  envs: [
    {
      name: 'MONGO_HOST',
      type: 'url',
      required: true,
    },
    {
      name: 'MONGO_PORT',
      type: 'port',
    },
  ],
  validator: ({ body, query }) => ({
    createUser: [
      body('name')
        .isString()
      query('enabled')
        .isBoolean()
    ],
  }),
}

Options

Basic Setup

• name (String): Microservice name

Server Setup

• middlewares.unshift (Array): Unshift/Prepend Express middleware before all default middlewares.
• middlewares.push (Array): Push/Append Express middleware after all default middlewares.
• middlewares.overwrite (Array): Overwrite all default Express. Note: when defined, unshift and push will be ignored.

Logger

• logger.transports (Array): List of Logger transports (See more: winston-transports)
• logger.level (String): Log only if logger.level less than or equal to this level
• logger.silent (Boolean): If true, all logs are suppressed

Environment Variables

• envs (Array[env]): List of environment variable definitions

Environment Object Properties

• env.name (String): Env variable name. Ex: MONGO_HOST
• env.type (String): Env variable type. Ex: int. See below all types.
• env.required (String): If true and not defined, the Microservie crashes.

Environment Variable Types

• int: Parse int number. Example: 123
• float: Parse float number. Example 12.8
• string Parse string. Example 'Hello'
• boolean. Parse boolean. Example: true
• host. Parse host. Example: localhost
• port. Parse port. Example: 3000
• url. Parse url. Example: http://editorasanar.com.br

Healthcheck

• health (Function): Custom function to assert the Microservice is healthy. Returns true healthy / false unhealthy

Database

• database.enabled: Enable / Disable database
• database.type: Database type. See the list of Database types below.

Database Types

• mongo: MongoDB using Mongoose framework

Note: Currently we are only giving support to mongo database.

Validator

• database.validator: Function that should return a map of key => validationMiddlewares

Note: We use express-validator. See all validator types.

---

Examples

Example 1 - Extending middlewares with Unshift / Push:

const beforeMiddleware = (req: any, res: any, next: any) => {
  console.log('Before all default middlewares');
  next();
};
 
const afterAllMiddleware = (req: any, res: any, next: any) => {
  console.log('After all default middlewares');
  next();
};
 
const ms = new SanarMS({
  name: 'my-service',
  middlewares: {
    unshift: [
      beforeMiddleware,
    ],
    push: [
      afterAllMiddleware,
    ]
  }
});

Example 2 - Overwriting middlewares:

const ms = new SanarMS({
  name: 'my-service',
  middlewares: {
    overwrite: [
      bodyParser.json(),
    ],
  }
});

Example 3 - Custom Logger Transports:

const ms = new SanarMS({
  name: 'my-service',
  transports: [
    new winston.transports.Console(),
    new winston.transports.File({ filename: 'app.log' }),
    new AwsCloudWatch(options),
  ],
});