Python + AWS Lambda Hands OnPython + AWS Lambda Hands On

Overview

Python + AWS Lambda Hands On

Python

Preparação do Ambiente

Criação do ambiente:

python3 -m venv ./hands-on-env

Ativação do ambiente:

# Linux
./hands-on-env/bin/activate
# Windows
hands-on-env/Script/activate.bat

PIP

  • É o gerenciador de pacotes do Python.
  • Gradle/Maven/NPM do Python

Instalação das dependências

pip install <NOME DO PACOTE>

# OU

pip install -r requirements.txt

Exemplos de script

exemplos/1-hello-world.py

Notebooks

jupyter notebook notebooks
  1. Python Básico
  2. Bot Bitcoin
  3. Analise Dados Bitcoin

AWS Lambda

  • Function as a service (FAAS)
  • Functions são configuradas, carregadas e executadas por uma runtime
  • Configuramos somente a memória. CPU é alocada indiretamente
  • Pagamos pelo tempo de duração da execução da função
  • Uma das peças principais de uma arquitetura Serverless

Pontos principais (Cai nas certificações):

  • Tempo máximo de duração 15 min
  • Pacote pode ter até 50 Mb zipado e 250 Mb deszipado
  • 512 Mb storage disponível no /tmp
  • Mínimo 128 MB and máximo 3GB

Permissões

  • AWS Lambda execution role

Exemplo: Assume role policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow",
    }
  ]
}

Versões

  • Cada deploy de uma lambda recebe uma versão sequencial e um ARN.
  • O ARN com sufixo latest aponta para o último deploy
  • Por essa caracteristica de imutabilidade de versão, podemos utilizar apelidos (Alias). Feature muito utilizada em integrações com o API Gateway para os modelos de deploy Blue Green
# Criar um apelido
aws lambda create-alias --function-name my-function --name alias-name --function-version version-number --description " "
# Alterar o apelido
aws lambda update-alias --function-name my-function --name alias-name --function-version version-number 
To delete an alias, use the delete-alias command.
# Deletar o apelido
aws lambda delete-alias --function-name my-function --name alias-name 

Ciclo de Vida

image

Fase Inicial:

  • Cria ou descongela a função
  • Faz download do código;
  • Configura as variáveis de ambiente;
  • Roda as funções de inicialização - Tudo que não pertença à função handler

Fase Execução:

  • A função handler é executada. Só pagamos por esse tempo (Billing execution).

Fase Desligamento:

  • Quando a função não recebe requisições por x segundos, a lambda é desligada.

Criação da Infraestrutura

Criação do Projeto

Podemos criar o projeto utilizando o Serverless Application Model (SAM).

  1. Instalar o client

  2. Criar a base do projeto:

sam init
# Seguir o passo a passo

Execução local

sam local invoke FunctionExemplo --event events/event.json
Owner
Marcelo Ortiz de Santana
Marcelo Ortiz de Santana
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