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implement backent into cdk
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‎.gitignore‎

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# LocalStack
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volume/
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.idea

‎app.py‎

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#!/usr/bin/env python3
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import os
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import aws_cdk as cdk
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from quiz_app.quiz_app_stack import QuizAppStack
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app = cdk.App()
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QuizAppStack(app, "QuizAppStack",
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# If you don't specify 'env', this stack will be environment-agnostic.
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# Account/Region-dependent features and context lookups will not work,
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# but a single synthesized template can be deployed anywhere.
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# Uncomment the next line to specialize this stack for the AWS Account
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# and Region that are implied by the current CLI configuration.
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#env=cdk.Environment(account=os.getenv('CDK_DEFAULT_ACCOUNT'), region=os.getenv('CDK_DEFAULT_REGION')),
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# Uncomment the next line if you know exactly what Account and Region you
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# want to deploy the stack to. */
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#env=cdk.Environment(account='123456789012', region='us-east-1'),
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# For more information, see https://docs.aws.amazon.com/cdk/latest/guide/environments.html
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)
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app.synth()

‎cdk.json‎

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{
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"app": "python3 app.py",
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"watch": {
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"include": [
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"**"
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],
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"exclude": [
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"README.md",
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"cdk*.json",
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"requirements*.txt",
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"source.bat",
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"**/__init__.py",
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"**/__pycache__",
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"tests"
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]
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},
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"context": {
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"@aws-cdk/aws-lambda:recognizeLayerVersion": true,
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"@aws-cdk/core:checkSecretUsage": true,
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"@aws-cdk/core:target-partitions": [
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"aws",
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"aws-cn"
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],
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"@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver": true,
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"@aws-cdk/aws-ec2:uniqueImdsv2TemplateName": true,
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"@aws-cdk/aws-ecs:arnFormatIncludesClusterName": true,
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"@aws-cdk/aws-iam:minimizePolicies": true,
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"@aws-cdk/core:validateSnapshotRemovalPolicy": true,
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"@aws-cdk/aws-codepipeline:crossAccountKeyAliasStackSafeResourceName": true,
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"@aws-cdk/aws-s3:createDefaultLoggingPolicy": true,
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"@aws-cdk/aws-sns-subscriptions:restrictSqsDescryption": true,
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"@aws-cdk/aws-apigateway:disableCloudWatchRole": true,
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"@aws-cdk/core:enablePartitionLiterals": true,
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"@aws-cdk/aws-events:eventsTargetQueueSameAccount": true,
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"@aws-cdk/aws-iam:standardizedServicePrincipals": true,
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"@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker": true,
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"@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName": true,
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"@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy": true,
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"@aws-cdk/aws-route53-patters:useCertificate": true,
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"@aws-cdk/customresources:installLatestAwsSdkDefault": false,
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"@aws-cdk/aws-rds:databaseProxyUniqueResourceName": true,
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"@aws-cdk/aws-codedeploy:removeAlarmsFromDeploymentGroup": true,
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"@aws-cdk/aws-apigateway:authorizerChangeDeploymentLogicalId": true,
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"@aws-cdk/aws-ec2:launchTemplateDefaultUserData": true,
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"@aws-cdk/aws-secretsmanager:useAttachedSecretResourcePolicyForSecretTargetAttachments": true,
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"@aws-cdk/aws-redshift:columnId": true,
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"@aws-cdk/aws-stepfunctions-tasks:enableEmrServicePolicyV2": true,
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"@aws-cdk/aws-ec2:restrictDefaultSecurityGroup": true,
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"@aws-cdk/aws-apigateway:requestValidatorUniqueId": true,
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"@aws-cdk/aws-kms:aliasNameRef": true,
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"@aws-cdk/aws-autoscaling:generateLaunchTemplateInsteadOfLaunchConfig": true,
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"@aws-cdk/core:includePrefixInUniqueNameGeneration": true,
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"@aws-cdk/aws-efs:denyAnonymousAccess": true,
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"@aws-cdk/aws-opensearchservice:enableOpensearchMultiAzWithStandby": true,
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"@aws-cdk/aws-lambda-nodejs:useLatestRuntimeVersion": true,
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"@aws-cdk/aws-efs:mountTargetOrderInsensitiveLogicalId": true,
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"@aws-cdk/aws-rds:auroraClusterChangeScopeOfInstanceParameterGroupWithEachParameters": true,
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"@aws-cdk/aws-appsync:useArnForSourceApiAssociationIdentifier": true,
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"@aws-cdk/aws-rds:preventRenderingDeprecatedCredentials": true,
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"@aws-cdk/aws-codepipeline-actions:useNewDefaultBranchForCodeCommitSource": true,
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"@aws-cdk/aws-cloudwatch-actions:changeLambdaPermissionLogicalIdForLambdaAction": true,
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"@aws-cdk/aws-codepipeline:crossAccountKeysDefaultValueToFalse": true,
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"@aws-cdk/aws-codepipeline:defaultPipelineTypeToV2": true,
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"@aws-cdk/aws-kms:reduceCrossAccountRegionPolicyScope": true
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}
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}

‎quiz_app/__init__.py‎

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‎quiz_app/quiz_app_stack.py‎

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import json
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from pathlib import Path
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from tty import CFLAG
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import aws_cdk
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from aws_cdk import (
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# Duration,
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Stack,
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aws_sqs as sqs,
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aws_dynamodb as dynamodb,
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aws_iam as iam,
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aws_lambda as _lambda,
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CfnOutput as Output
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)
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from constructs import Construct
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class QuizAppStack(Stack):
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def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
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super().__init__(scope, construct_id, **kwargs)
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# TABLES
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quizzes_table = dynamodb.Table(
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self,
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"QuizzesTable",
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table_name="Quizzes",
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partition_key=dynamodb.Attribute(
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name="QuizID",
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type=dynamodb.AttributeType.STRING,
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),
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billing_mode=dynamodb.BillingMode.PROVISIONED,
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read_capacity=5,
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write_capacity=5,
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)
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user_submissions_table = dynamodb.Table(
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self,
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"UserSubmissionsTable",
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table_name="UserSubmissions",
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partition_key=dynamodb.Attribute(
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name="SubmissionID",
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type=dynamodb.AttributeType.STRING,
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),
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billing_mode=dynamodb.BillingMode.PROVISIONED,
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read_capacity=5,
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write_capacity=5,
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)
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user_submissions_table.add_global_secondary_index(
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index_name="QuizID-Score-index",
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partition_key=dynamodb.Attribute(
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name="QuizID",
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type=dynamodb.AttributeType.STRING,
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),
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sort_key=dynamodb.Attribute(
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name="Score",
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type=dynamodb.AttributeType.NUMBER,
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),
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projection_type=dynamodb.ProjectionType.ALL,
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read_capacity=5,
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write_capacity=5,
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)
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Output(self, "QuizTable", value=quizzes_table.table_name)
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Output(self, "UserSubmissionsTable", value=user_submissions_table.table_name)
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functions_and_roles = [
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("CreateQuizFunction","configurations/create_quiz_policy.json","CreateQuizRole", "lambdas/get_quiz/handler.py"),
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("GetQuizFunction","configurations/get_quiz_policy.json","GetQuizRole", "lambdas/get_quiz/handler.py"),
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("SubmitQuizFunction","configurations/submit_quiz_policy.json", "SubmitQuizRole", "lambdas/submit_quiz/handler.py"),
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("ScoringFunction", "configurations/scoring_policy.json", "ScoringRole", "lambdas/scoring/handler.py"),
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("GetSubmissionFunction", "configurations/get_submission_policy.json", "GetSubmissionRole", "lambdas/get_submission/handler.py"),
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("GetLeaderboardFunction", "configurations/get_leaderboard_policy.json", "GetLeaderboardRole", "lambdas/get_leaderboard/handler.py"),
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("ListPublicQuizzesFunction", "configurations/list_quizzes_policy.json", "ListQuizzesRole", "lambdas/list_quizzes/handler.py"),
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("RetryQuizzesWritesFunction","configurations/retry_quizzes_writes_policy.json", "RetryQuizzesWritesRole", "lambdas/retry_quizzes_writes/handler.py"),
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]
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for function_info in functions_and_roles:
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function_name, policy_file_path, role_name, handler_path = function_info
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policy_json = self.read_policy_file(f"../{policy_file_path}")
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policy_document = iam.PolicyDocument.from_json(policy_json)
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policy = iam.ManagedPolicy(
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self,
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"FunctionPolicy",
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managed_policy_name=f"{function_name}Policy",
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document=policy_document,
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)
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role = iam.Role(
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self,
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"LambdaExecutionRole",
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role_name=role_name,
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assumed_by=iam.ServicePrincipal("lambda.amazonaws.com"),
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description=f"Role for Lambda function {function_name}",
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)
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# Attach the policy to the role
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role.add_managed_policy(policy)
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_lambda.Function(
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self,
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"LambdaFunction",
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function_name=function_name,
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runtime=_lambda.Runtime.PYTHON_3_11,
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handler="handler.lambda_handler",
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code=_lambda.Code.from_asset(handler_path),
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role=role,
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timeout=aws_cdk.Duration.seconds(30),
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)
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sqs.Queue(scope, "QuizSubmissionQueue", queue_name="QuizSubmissionQueue")
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@staticmethod
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def read_policy_file(file_path: str) -> dict:
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"""Reads a JSON policy file and returns it as a dictionary."""
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file_path = Path(file_path)
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if not file_path.exists():
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raise FileNotFoundError(f"Policy file not found: {file_path}")
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with open(file_path, "r") as file:
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return json.load(file)

‎requirements-dev.txt‎

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pytest==6.2.5

‎requirements.txt‎

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aws-cdk-lib==2.136.0
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constructs>=10.0.0,<11.0.0

‎source.bat‎

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@echo off
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rem The sole purpose of this script is to make the command
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rem
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rem source .venv/bin/activate
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rem
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rem (which activates a Python virtualenv on Linux or Mac OS X) work on Windows.
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rem On Windows, this command just runs this batch file (the argument is ignored).
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rem
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rem Now we don't need to document a Windows command for activating a virtualenv.
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echo Executing .venv\Scripts\activate.bat for you
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.venv\Scripts\activate.bat

‎tests/__init__.py‎

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‎tests/unit/__init__.py‎

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