AWS SDK を使用して REST API を作成してデプロイする - AWS SDK コードの例

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AWS SDK を使用して REST API を作成してデプロイする

次のコードサンプルは、以下の操作方法を示しています。

  • API Gateway で提供される REST API を作成します。

  • ユーザープロファイルを表すリソースを REST API に追加します。

  • REST API が DynamoDB テーブルを使用してユーザープロファイルデータを保存するように、統合メソッドを追加します。

  • HTTP リクエストを REST API に送信して、ユーザープロファイルを追加および取得します。

Python
SDK for Python (Boto3)
注記

については、「」を参照してください GitHub。AWS コード例リポジトリ で全く同じ例を見つけて、設定と実行の方法を確認してください。

API Gateway オペレーションをラップするクラスを作成します。

import argparse import json import logging from pprint import pprint import boto3 from botocore.exceptions import ClientError import requests logger = logging.getLogger(__name__) class ApiGatewayToService: """ Encapsulates Amazon API Gateway functions that are used to create a REST API that integrates with another AWS service. """ def __init__(self, apig_client): """ :param apig_client: A Boto3 API Gateway client. """ self.apig_client = apig_client self.api_id = None self.root_id = None self.stage = None def create_rest_api(self, api_name): """ Creates a REST API on API Gateway. The default API has only a root resource and no HTTP methods. :param api_name: The name of the API. This descriptive name is not used in the API path. :return: The ID of the newly created API. """ try: result = self.apig_client.create_rest_api(name=api_name) self.api_id = result["id"] logger.info("Created REST API %s with ID %s.", api_name, self.api_id) except ClientError: logger.exception("Couldn't create REST API %s.", api_name) raise try: result = self.apig_client.get_resources(restApiId=self.api_id) self.root_id = next( item for item in result["items"] if item["path"] == "/" )["id"] except ClientError: logger.exception("Couldn't get resources for API %s.", self.api_id) raise except StopIteration as err: logger.exception("No root resource found in API %s.", self.api_id) raise ValueError from err return self.api_id def add_rest_resource(self, parent_id, resource_path): """ Adds a resource to a REST API. :param parent_id: The ID of the parent resource. :param resource_path: The path of the new resource, relative to the parent. :return: The ID of the new resource. """ try: result = self.apig_client.create_resource( restApiId=self.api_id, parentId=parent_id, pathPart=resource_path ) resource_id = result["id"] logger.info("Created resource %s.", resource_path) except ClientError: logger.exception("Couldn't create resource %s.", resource_path) raise else: return resource_id def add_integration_method( self, resource_id, rest_method, service_endpoint_prefix, service_action, service_method, role_arn, mapping_template, ): """ Adds an integration method to a REST API. An integration method is a REST resource, such as '/users', and an HTTP verb, such as GET. The integration method is backed by an AWS service, such as Amazon DynamoDB. :param resource_id: The ID of the REST resource. :param rest_method: The HTTP verb used with the REST resource. :param service_endpoint_prefix: The service endpoint that is integrated with this method, such as 'dynamodb'. :param service_action: The action that is called on the service, such as 'GetItem'. :param service_method: The HTTP method of the service request, such as POST. :param role_arn: The Amazon Resource Name (ARN) of a role that grants API Gateway permission to use the specified action with the service. :param mapping_template: A mapping template that is used to translate REST elements, such as query parameters, to the request body format required by the service. """ service_uri = ( f"arn:aws:apigateway:{self.apig_client.meta.region_name}" f":{service_endpoint_prefix}:action/{service_action}" ) try: self.apig_client.put_method( restApiId=self.api_id, resourceId=resource_id, httpMethod=rest_method, authorizationType="NONE", ) self.apig_client.put_method_response( restApiId=self.api_id, resourceId=resource_id, httpMethod=rest_method, statusCode="200", responseModels={"application/json": "Empty"}, ) logger.info("Created %s method for resource %s.", rest_method, resource_id) except ClientError: logger.exception( "Couldn't create %s method for resource %s.", rest_method, resource_id ) raise try: self.apig_client.put_integration( restApiId=self.api_id, resourceId=resource_id, httpMethod=rest_method, type="AWS", integrationHttpMethod=service_method, credentials=role_arn, requestTemplates={"application/json": json.dumps(mapping_template)}, uri=service_uri, passthroughBehavior="WHEN_NO_TEMPLATES", ) self.apig_client.put_integration_response( restApiId=self.api_id, resourceId=resource_id, httpMethod=rest_method, statusCode="200", responseTemplates={"application/json": ""}, ) logger.info( "Created integration for resource %s to service URI %s.", resource_id, service_uri, ) except ClientError: logger.exception( "Couldn't create integration for resource %s to service URI %s.", resource_id, service_uri, ) raise def deploy_api(self, stage_name): """ Deploys a REST API. After a REST API is deployed, it can be called from any REST client, such as the Python Requests package or Postman. :param stage_name: The stage of the API to deploy, such as 'test'. :return: The base URL of the deployed REST API. """ try: self.apig_client.create_deployment( restApiId=self.api_id, stageName=stage_name ) self.stage = stage_name logger.info("Deployed stage %s.", stage_name) except ClientError: logger.exception("Couldn't deploy stage %s.", stage_name) raise else: return self.api_url() def api_url(self, resource=None): """ Builds the REST API URL from its parts. :param resource: The resource path to append to the base URL. :return: The REST URL to the specified resource. """ url = ( f"https://{self.api_id}.execute-api.{self.apig_client.meta.region_name}" f".amazonaws.com/{self.stage}" ) if resource is not None: url = f"{url}/{resource}" return url

REST API をデプロイし、リクエストパッケージで呼び出します。

def usage_demo(table_name, role_name, rest_api_name): """ Demonstrates how to used API Gateway to create and deploy a REST API, and how to use the Requests package to call it. :param table_name: The name of the demo DynamoDB table. :param role_name: The name of the demo role that grants API Gateway permission to call DynamoDB. :param rest_api_name: The name of the demo REST API created by the demo. """ gateway = ApiGatewayToService(boto3.client("apigateway")) role = boto3.resource("iam").Role(role_name) print("Creating REST API in API Gateway.") gateway.create_rest_api(rest_api_name) print("Adding resources to the REST API.") profiles_id = gateway.add_rest_resource(gateway.root_id, "profiles") username_id = gateway.add_rest_resource(profiles_id, "{username}") # The DynamoDB service requires that all integration requests use POST. print("Adding integration methods to read and write profiles in Amazon DynamoDB.") gateway.add_integration_method( profiles_id, "GET", "dynamodb", "Scan", "POST", role.arn, {"TableName": table_name}, ) gateway.add_integration_method( profiles_id, "POST", "dynamodb", "PutItem", "POST", role.arn, { "TableName": table_name, "Item": { "username": {"S": "$input.path('$.username')"}, "name": {"S": "$input.path('$.name')"}, "title": {"S": "$input.path('$.title')"}, }, }, ) gateway.add_integration_method( username_id, "GET", "dynamodb", "GetItem", "POST", role.arn, { "TableName": table_name, "Key": {"username": {"S": "$method.request.path.username"}}, }, ) stage = "test" print(f"Deploying the {stage} stage.") gateway.deploy_api(stage) profiles_url = gateway.api_url("profiles") print( f"Using the Requests package to post some people to the profiles REST API at " f"{profiles_url}." ) requests.post( profiles_url, json={"username": "will", "name": "William Shakespeare", "title": "playwright"}, ) requests.post( profiles_url, json={ "username": "ludwig", "name": "Ludwig van Beethoven", "title": "composer", }, ) requests.post( profiles_url, json={"username": "jane", "name": "Jane Austen", "title": "author"}, ) print("Getting the list of profiles from the REST API.") profiles = requests.get(profiles_url).json() pprint(profiles) print(f"Getting just the profile for username 'jane' (URL: {profiles_url}/jane).") jane = requests.get(f"{profiles_url}/jane").json() pprint(jane)