internal TheStateMachineStack(Construct scope, string id, IStackProps props = null) : base(scope, id, props)
        {
            // Step Function Starts Here

            // The first thing we need to do is see if they are asking for pineapple on a pizza
            _pineappleCheckHandler = new Lambda.Function(this, "pineappleCheckHandler", new Lambda.FunctionProps
            {
                Runtime = Lambda.Runtime.NODEJS_12_X,
                Code    = Lambda.Code.FromAsset("lambda_fns"),
                Handler = "orderPizza.handler"
            });

            /*
             * Step functions are built up of steps, we need to define our first step
             * This step was refactored due to Deprecated function
             */
            _orderPizzaTask = new StepFunctionTasks.LambdaInvoke(this, "Order Pizza Job", new StepFunctionTasks.LambdaInvokeProps
            {
                LambdaFunction      = _pineappleCheckHandler,
                InputPath           = "$.flavour",
                ResultPath          = "$.pineappleAnalysis",
                PayloadResponseOnly = true
            });

            // Pizza Order failure step defined
            _jobFailed = new StepFunction.Fail(this, "Sorry, We Dont add Pineapple", new StepFunction.FailProps
            {
                Cause = "They asked for Pineapple",
                Error = "Failed To Make Pizza"
            });

            // If they didnt ask for pineapple let's cook the pizza
            _cookPizza = new StepFunction.Pass(this, "Lets make your pizza");

            // If they ask for a pizza with pineapple, fail. Otherwise cook the pizza
            _chainDefinition = StepFunction.Chain
                               .Start(_orderPizzaTask)
                               .Next(new StepFunction.Choice(this, "With Pineapple?") // Logical choice added to flow
                                     .When(StepFunction.Condition.BooleanEquals("$.pineappleAnalysis.containsPineapple", true), _jobFailed)
                                     .Otherwise(_cookPizza));

            // Building the state machine
            _stateMachine = new StepFunction.StateMachine(this, "StateMachine", new StepFunction.StateMachineProps
            {
                Definition       = _chainDefinition,
                Timeout          = Duration.Minutes(5),
                TracingEnabled   = true,
                StateMachineType = StepFunction.StateMachineType.EXPRESS
            });

            /**
             * HTTP API Definition
             **/

            // We need to give our HTTP API permission to invoke our step function
            _httpApiRole = new IAM.Role(this, "HttpAPIRole", new IAM.RoleProps
            {
                AssumedBy      = new IAM.ServicePrincipal("apigateway.amazonaws.com"),
                InlinePolicies = new Dictionary <string, IAM.PolicyDocument>
                {
                    { "AllowSFNExec", new IAM.PolicyDocument(new IAM.PolicyDocumentProps
                        {
                            Statements = new IAM.PolicyStatement[]
                            {
                                new IAM.PolicyStatement(new IAM.PolicyStatementProps
                                {
                                    Actions   = new string[] { "states:StartSyncExecution" },
                                    Effect    = IAM.Effect.ALLOW,
                                    Resources = new string[] { _stateMachine.StateMachineArn }
                                })
                            }
                        }) }
                }
            });

            _api = new APIGateway.HttpApi(this, "TheStateMachineAPI", new APIGateway.HttpApiProps
            {
                CreateDefaultStage = true
            });

            _integration = new APIGateway.CfnIntegration(this, "Integration", new APIGateway.CfnIntegrationProps
            {
                ApiId              = _api.HttpApiId,
                IntegrationType    = "AWS_PROXY",
                ConnectionType     = "INTERNET",
                IntegrationSubtype = "StepFunctions-StartSyncExecution",
                CredentialsArn     = _httpApiRole.RoleArn,
                RequestParameters  = new Dictionary <string, string>
                {
                    { "Input", "$request.body" }, { "StateMachineArn", _stateMachine.StateMachineArn }
                },
                PayloadFormatVersion = "1.0",
                TimeoutInMillis      = 10000
            });

            new APIGateway.CfnRoute(this, "DefaultRoute", new APIGateway.CfnRouteProps
            {
                ApiId    = _api.HttpApiId,
                RouteKey = APIGateway.HttpRouteKey.DEFAULT.Key,
                Target   = "integrations/" + _integration.Ref
            });

            new Amazon.CDK.CfnOutput(this, "HTTP API Url", new Amazon.CDK.CfnOutputProps
            {
                Value = _api.Url
            });
        }
Ejemplo n.º 2
0
        internal TheStateMachineStack(Construct scope, string id, IStackProps props = null) : base(scope, id, props)
        {
            // Step Function Starts Here

            // The first thing we need to do is see if they are asking for pineapple on a pizza
            _pineppaleCheckHandler = new Lambda.Function(this, "pineappleCheckLambdaHandler", new Lambda.FunctionProps
            {
                Runtime = Lambda.Runtime.NODEJS_12_X,
                Code    = Lambda.Code.FromAsset("lambda_fns"),
                Handler = "orderPizza.handler"
            });

            /*
             * Step functions are built up of steps, we need to define our first step
             * This step was refactored due to Deprecated function
             */
            _orderPizzaTask = new StepFuncionTasks.LambdaInvoke(this, "Order Pizza Job", new StepFuncionTasks.LambdaInvokeProps
            {
                LambdaFunction      = _pineppaleCheckHandler,
                InputPath           = "$.flavour",
                ResultPath          = "$.pineappleAnalysis",
                PayloadResponseOnly = true
            });

            // Pizza Order failure step defined
            _jobFailed = new StepFunction.Fail(this, "Sorry, We Dont add Pineapple", new StepFunction.FailProps
            {
                Cause = "Failed To Make Pizza",
                Error = "They asked for Pineapple"
            });

            // If they didnt ask for pineapple let's cook the pizza
            _cookPizza = new StepFunction.Pass(this, "Lets make your pizza");

            // If they ask for a pizza with pineapple, fail. Otherwise cook the pizza
            _chainDefinition = StepFunction.Chain
                               .Start(_orderPizzaTask)
                               .Next(new StepFunction.Choice(this, "With Pineapple?") // Logical choice added to flow
                                     .When(StepFunction.Condition.BooleanEquals("$.pineappleAnalysis.containsPineapple", true), _jobFailed)
                                     .Otherwise(_cookPizza));

            // Building the state machine
            _stateMachine = new StepFunction.StateMachine(this, "StateMachine", new StepFunction.StateMachineProps
            {
                Definition = _chainDefinition,
                Timeout    = Duration.Minutes(5)
            });

            /**
             * Dead Letter Queue Setup
             * SQS creation
             * https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-dead-letter-queues.html
             */
            _deadeLetterQueue = new SQS.Queue(this, "stateMachineLambdaDLQ", new SQS.QueueProps
            {
                VisibilityTimeout = Duration.Seconds(300)
            });

            // defines an AWS Lambda resource to connect to our API Gateway
            _stateMachineHandler = new Lambda.Function(this, "stateMachineLambdaHandler", new Lambda.FunctionProps
            {
                Runtime         = Lambda.Runtime.NODEJS_12_X,
                Code            = Lambda.Code.FromAsset("lambda_fns"),
                Handler         = "stateMachineLambda.handler",
                DeadLetterQueue = _deadeLetterQueue,
                Environment     = new Dictionary <string, string>
                {
                    { "statemachine_arn", _stateMachine.StateMachineArn }
                }
            });

            // Grants to state machine execution
            _stateMachine.GrantStartExecution(_stateMachineHandler);

            /*
             * Simple API Gateway proxy integration
             */
            // defines an API Gateway REST API resource backed by our "sqs_publish_lambda" function.
            new APIGateway.LambdaRestApi(this, "Endpoint", new APIGateway.LambdaRestApiProps
            {
                Handler = _stateMachineHandler
            });
        }