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# AWS Lambda Rest Api ## What is "AWS Lambda Rest Api" It makes rest api lambda simple and readable. ## How To Install ```shell $ pip install aws-lambda-rest-api ``` or ```txt # requirements.txt ︙ aws-lambda-rest-api ︙ ``` ## How To Use Suppose write resource file as below, ```yaml Resources: QuestionApi: Type: AWS::Serverless::Function Properties: CodeUri: questions/ Handler: rest.lambda_handler Runtime: python3.8 Events: GetQuestions: Type: Api Properties: Path: /questions Method: get GetQuestion: Type: Api Properties: Path: /questions/{question_id} Method: get CreateQuestion: Type: Api Properties: Path: /questions Method: post UpdateQuestion: Type: Api Properties: Path: /questions/{question_id} Method: put PartialUpdateQuestion: Type: Api Properties: Path: /questions/{question_id} Method: put DestoryQuestion: Type: Api Properties: Path: /questions/{question_id} Method: delete ``` You can write rest.py as below. ```python from aws_lambda_rest_api import RestApi class QuestionApi(RestApi): detail_key = 'question_id' def list(self, event, context): return { 'statusCode': 200, 'body': [1, 2, 3], } def retrieve(self, event, context): question_id = event['pathParameters'].get('question_id') return { 'statusCode': 200, 'body': {'id': question_id, 'title': 'Hello Question'}, } def create(self, event, context): return { 'statusCode': 200, 'body': 'Done create.', } def update(self, event, context): question_id = event['pathParameters'].get('question_id') return { 'statusCode': 200, 'body': 'Done update.', } def partial_update(self, event, context): question_id = event['pathParameters'].get('question_id') return { 'statusCode': 200, 'body': 'Done update partially.', } def destory(self, event, context): question_id = event['pathParameters'].get('question_id') return { 'statusCode': 200, 'body': 'Done destroy.' } ``` The chart below shows the relationship between the http method and overrided method. |Http Method|Detail?|Overrided Method| |:----|:----|:----| |GET|TRUE|retrieve| |GET|FALSE|list| |POST|TRUE|-| |POST|FALSE|create| |PUT|TRUE|update| |PUT|FALSE|-| |PATCH|TRUE|partial_update| |PATCH|FALSE|-| |DELETE|TRUE|destroy| |DELETE|FALSE|-| |ANY|ANY|default|