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
});
}
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
});
}
