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AWS SAMの環境変数設定方法

Last updated at Posted at 2019-11-10

AWS SAM とは

https://docs.aws.amazon.com/ja_jp/serverless-application-model/latest/developerguide/what-is-sam.html

AWS SAM でGoogle先生に聞けば、色んな回答が出ます。

Background

Lambda のローカルテストよく使われるツールで、template.ymlLambdaAPI Gateway の設定を書いて、AWS SAM CLI から実行し、テストします。

Example

template.yml
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Runtime: nodejs10.x
    Handler: index.handler
    Timeout: 10
    MemorySize: 1024
    Environment:
      Variables:
        DYNAMO_ENDPOINT: DUMMY_ENDPOINT

Resources:
  A001:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ../build/A001/
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /groups
            Method: GET
      Environment:
        Variables:
          TABLE_GROUP_WORDS: DUMMY_GROUP_WORDS

Goal

DUMMY_ENDPOINTDUMMY_GROUP_WORDS を置き換えます。

Start Command

sam local start-api -t template.yml --env-vars vars.json

Implement

GlobalsResources sectionの書き方が違います。

vars.json
{
  "Parameters": { ## Globals Section
    "DYNAMO_ENDPOINT": "http://host.docker.internal:4569"
  },
  "A001": {  ## Resources Section
    "DUMMY_GROUP_WORDS": "T_GROUP_WORDS"
  }
}

Summay

GlobalsParameters で設定し、Resources は実際の Resource 名となります。

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