Archivo configuración

Configurando el iamRoleStatements del recurso podemos conectarnos a el.

# Serverless.yml
service: aws-lambda-crud-node
frameworkVersion: '2 || 3'

provider:
	name: aws
	runtime: nodejs12.x
	lambdaHashingVersion: '20201221'
	region: us-west-2
	iamRoleStatements:
		- Effect: Allow
			Action:
        - dynamodb:*
			Resource:
				- arn:aws:dynamodb:us-west-2:xxxxxxxxx:table/TaskTable

functions:

resources:

Crear tabla

Esto crea una nueva tabla con un id como partition key de tipo string.

resources:
	Resources:
		TaskTable:
			Type: AWS::DynamoDB::Table
			Properties:
				TableName: TaskTable
				BillingMode: PAY_PER_REQUEST
			AttributeDefinitions:
				- AttributeName: id
					AttributeType: S
			KeySchema:
				- AttributeName: id
					keyType: HASH

Configurar lambda

// addTask.js
const { v4 } = require('uuid')
const AWS = require('aws-sdk')

const addTask = async(event) => {

	// Conectar a la base de datos, mediante el clientID
	const dynamodb = new AWS.DynamoDB.DocumentClient()

	const { title, description } = JSON.parse(event.body)
	const createdAt = new Date()	
	const id = v4()
	
	const newTask = {
		id,
		title,
		description,
		createdAt
	}

	await dynamodb.put({
		TableName: 'TaskTable',
		Item: newTask
	}).promise()

	return {
		statusCode: 200,
		body: JSON.stringify(newTask)
	}
} 

module.exports = {
	addTask,
}

functions:
	createTask:
		handler: src/addTask.addTask
		events:
			- httpApi:
					path: /tasks
					method: post

Desplegar

sls deploy --verbose

https://www.youtube.com/watch?v=wvux4WOU5dc