【Python】AWS SAMでLambda単体デプロイ【AWS】

この記事はAWS SAMによるLambdaの単体デプロイについて解説したものです。

こんにちは！らびです。今回はAWS SAMを使ってLambdaを単体デプロイしていきます。

前回取り上げたtemplate.yamlの知識を応用していきます！

Lambdaテンプレートの作成
template.yamlの修正
ビルドとデプロイ
まとめ

Lambdaテンプレートの作成

まずはLambdaのテンプレートを作成しましょう。作業用のフォルダでsam initを実行します。

実行結果はこんな感じだジョ。

$sam init

Which template source would you like to use?
        1 - AWS Quick Start Templates
        2 - Custom Template Location
Choice: 1

Cloning from https://github.com/aws/aws-sam-cli-app-templates

Choose an AWS Quick Start application template
        1 - Hello World Example
        2 - Multi-step workflow
        3 - Serverless API
        4 - Scheduled task
        5 - Standalone function
        6 - Data processing
        7 - Infrastructure event management
        8 - Machine Learning
Template: 1

 Use the most popular runtime and package type? (Nodejs and zip) [y/N]: N

Which runtime would you like to use?
        1 - dotnet5.0
        2 - dotnetcore3.1
        3 - dotnetcore2.1
        4 - go1.x
        5 - java11
        6 - java8.al2
        7 - java8
        8 - nodejs14.x
        9 - nodejs12.x
        10 - nodejs10.x
        11 - python3.9
        12 - python3.8
        13 - python3.7
        14 - python3.6
        15 - python2.7
        16 - ruby2.7
        17 - ruby2.5
Runtime: 11

What package type would you like to use?
        1 - Zip
        2 - Image
Package type: 1

Based on your selections, the only dependency manager available is pip.
We will proceed copying the template using pip.

Project name [sam-app]: sam-app-20220118-01

    -----------------------
    Generating application:
    -----------------------
    Name: sam-app-20220118-01
    Runtime: python3.9
    Architectures: x86_64
    Dependency Manager: pip
    Application Template: hello-world
    Output Directory: .

    Next steps can be found in the README file at ./sam-app-20220118-01/README.md


    Commands you can use next
    =========================
    [*] Create pipeline: cd sam-app-20220118-01 && sam pipeline init --bootstrap
    [*] Test Function in the Cloud: sam sync --stack-name {stack-name} --watch

template.yamlの修正

先ほど作成したLambdaのテンプレートでtemplate.yamlを修正して、API Gatewayに関する記述をコメントアウトします。

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  sam-app-20220118-01

  Sample SAM Template for sam-app-20220118-01

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.9
      Architectures:
        - x86_64
      # Events:
      #   HelloWorld:
      #     Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
      #     Properties:
      #       Path: /hello
      #       Method: get

Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  # HelloWorldApi:
  #   Description: "API Gateway endpoint URL for Prod stage for Hello World function"
  #   Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"
  HelloWorldFunction:
    Description: "Hello World Lambda Function ARN"
    Value: !GetAtt HelloWorldFunction.Arn
  HelloWorldFunctionIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt HelloWorldFunctionRole.Arn

ビルドとデプロイ

変更したtemplate.yamlの内容でビルドとデプロイを実施しましょう。

ビルドとデプロイのコマンドはそれぞれ以下の通りです。

$sam build

$sam deploy --guided

ログや管理コンソールから単体デプロイが確認できるジョ。

ログ

…

CloudFormation events from stack operations
---------------------------------------------------------------------------------------------------------------------
ResourceStatus                ResourceType                  LogicalResourceId             ResourceStatusReason
---------------------------------------------------------------------------------------------------------------------
CREATE_IN_PROGRESS            AWS::IAM::Role                HelloWorldFunctionRole        -
CREATE_IN_PROGRESS            AWS::IAM::Role                HelloWorldFunctionRole        Resource creation Initiated
CREATE_COMPLETE               AWS::IAM::Role                HelloWorldFunctionRole        -
CREATE_IN_PROGRESS            AWS::Lambda::Function         HelloWorldFunction            -
CREATE_IN_PROGRESS            AWS::Lambda::Function         HelloWorldFunction            Resource creation Initiated
CREATE_COMPLETE               AWS::Lambda::Function         HelloWorldFunction            -
CREATE_COMPLETE               AWS::CloudFormation::Stack    sam-app-20220118-01           -
---------------------------------------------------------------------------------------------------------------------

…