Using aws sfn with mskconnect

Question

Pulumi · Accepted Answer

AWS Step Functions (SFN) allow you to coordinate multiple AWS services into serverless workflows. When you want to integrate Amazon Managed Streaming for Apache Kafka (Amazon MSK) with AWS Step Functions, you often use Amazon MSK Connect which is a service that helps you to build and run scalable, secure, and highly available Apache Kafka to Apache Kafka data replication tasks.

To demonstrate how to use AWS Step Functions with MSK Connect, we will create a workflow that triggers an MSK Connect task, and then proceed with further steps based on the result of that task. We'll create a Step Function (State Machine) that has a task state to interact with MSK Connect. For simplicity, our workflow won't have any complex logic and will consist of only triggering the MSK Connect task.

Here's a basic Pulumi program written in TypeScript that sets up the necessary resources to demonstrate this integration:

1. **MSK Connect Connector**: This resource defines the connector for MSK to handle specific Kafka connect tasks.
2. **State Machine**: The Step Functions State Machine will be defined to include a task that references our MSK Connect work.

The following program assumes that you have already set up the necessary IAM roles and policies that allow Step Functions to execute MSK Connect tasks:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// MSK Connect Connector
const mskConnectConnector = new aws.mskconnect.Connector("myMskConnectConnector", {
    // Replace with the actual configuration specifics for your MSK Connect Connector
    kafkaCluster: {
        apacheKafkaCluster: {
            bootstrapServers: "YOUR_BOOTSTRAP_SERVERS",
            vpc: {
                securityGroups: ["YOUR_SECURITY_GROUP_IDS"],
                subnets: ["YOUR_SUBNET_IDS"],
            },
        },
    },
    kafkaconnectVersion: "2.7.1",
    serviceExecutionRoleArn: "YOUR_SERVICE_EXECUTION_ROLE_ARN",
    // ... other required configurations like connector plugins and capacity.
    // See AWS Provider documentation for more details.
});

// IAM Role for Step Functions to interact with MSK Connect
const sfnRole = new aws.iam.Role("sfnRole", {
    assumeRolePolicy: {
        Version: "2012-10-17",
        Statement: [{
            Action: "sts:AssumeRole",
            Effect: "Allow",
            Principal: {
                Service: "states.amazonaws.com",
            },
        }],
    },
});

// Assume we've created a policy that allows invoking MSK Connect and attached it to `sfnRole`,
// you would specify the policy ARN below as 'aws:iam::Policy:policyARN'.
const rolePolicyAttachment = new aws.iam.RolePolicyAttachment("sfnRolePolicyAttachment", {
    role: sfnRole,
    policyArn: "arn:aws:iam::aws:policy/service-role/AWSLambdaRole", // replace with your specific policy ARN
});

// Step Functions State Machine - Integrating with MSK Connect
const mskTaskStateMachine = new aws.sfn.StateMachine("mskTaskStateMachine", {
    roleArn: sfnRole.arn,
    definition: pulumi.interpolate`{
        "Comment": "A simple AWS Step Functions state machine that triggers an MSK Connect task.",
        "StartAt": "MskConnectTask",
        "States": {
            "MskConnectTask": {
                "Type": "Task",
                "Resource": "arn:aws:states:::mskconnect:startConnector.sync",
                "Parameters": {
                    "ConnectorArn": "${mskConnectConnector.arn}"
                },
                "End": true
            }
        }
    }`,
});

// Export the State Machine ARN
export const stateMachineArn = mskTaskStateMachine.arn;
```

**Explanation:**

- We import the required Pulumi AWS SDK packages to create resources.
- We declare a `Connector` with a placeholder for configurations. You need to update them with the actual values from your environment (Bootstrap servers, VPC configurations, service execution role ARN, etc.).
- We create an IAM Role (`sfnRole`) with a trust relationship that allows Step Functions to assume this role.
- A policy is attached to the IAM role, allowing the necessary actions to be performed by the Step Functions. Replace the policy ARN with the specific policy that grants permissions to invoke MSK Connect actions.
- The `StateMachine` is defined with a single task state that invokes the MSK Connect Connector. The ARN of the created Connector resource is passed as a parameter.
- We export the ARN of the created State Machine for reference or integration with other systems.

Make sure to replace placeholder values like `YOUR_BOOTSTRAP_SERVERS`, `YOUR_SECURITY_GROUP_IDS`, and `YOUR_SERVICE_EXECUTION_ROLE_ARN` with actual values from your AWS environment. The IAM role and policies should also be configured according to your security requirements and the specific permissions needed to run the tasks.

This program forms the foundation of a Pulumi project to define infrastructure as code for your AWS resources integrating Step Functions with MSK Connect.