Spring Boot service that reads from the AWS Glue Data Catalog

 To create a Spring Boot service that reads from the AWS Glue Data Catalog, you need to set up a few components:

1. Spring Boot Application: Set up a Spring Boot application.
2. AWS SDK for Glue: Add the necessary dependencies for AWS Glue.
3. AWS Configuration: Configure the AWS credentials and region.
4. Service Class: Create a service class to interact with the Glue Data Catalog.

Here’s a step-by-step guide:

Step 1: Set Up Your Spring Boot Application

Start by creating a new Spring Boot project. You can use Spring Initializr (https://start.spring.io/) to generate a basic Spring Boot project with the necessary dependencies.

Step 2: Add Dependencies

Add the necessary dependencies to your pom.xml file:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>software.amazon.awssdk</groupId>
        <artifactId>glue</artifactId>
    </dependency>
    <dependency>
        <groupId>software.amazon.awssdk</groupId>
        <artifactId>auth</artifactId>
    </dependency>
</dependencies>

Step 3: Configure AWS Credentials and Region

Create an application.yml or application.properties file to configure your AWS credentials and region.

yaml
aws:
  region: us-west-2
  accessKeyId: YOUR_ACCESS_KEY_ID
  secretAccessKey: YOUR_SECRET_ACCESS_KEY

Step 4: Create AWS Configuration Class

Create a configuration class to set up the AWS Glue client.

java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.glue.GlueClient;

@Configuration
public class AwsConfig {

    @Value("${aws.accessKeyId}")
    private String accessKeyId;

    @Value("${aws.secretAccessKey}")
    private String secretAccessKey;

    @Value("${aws.region}")
    private String region;

    @Bean
    public GlueClient glueClient() {
        return GlueClient.builder()
                .region(Region.of(region))
                .credentialsProvider(StaticCredentialsProvider.create(AwsBasicCredentials.create(accessKeyId, secretAccessKey)))
                .build();
    }
}

Step 5: Create a Service Class

Create a service class to interact with the Glue Data Catalog.

java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import software.amazon.awssdk.services.glue.GlueClient;
import software.amazon.awssdk.services.glue.model.GetDatabasesRequest;
import software.amazon.awssdk.services.glue.model.GetDatabasesResponse;

@Service
public class GlueService {

    private final GlueClient glueClient;

    @Autowired
    public GlueService(GlueClient glueClient) {
        this.glueClient = glueClient;
    }

    public GetDatabasesResponse getDatabases() {
        GetDatabasesRequest request = GetDatabasesRequest.builder().build();
        return glueClient.getDatabases(request);
    }
}

Step 6: Create a Controller Class

Create a controller class to expose an endpoint for the service.

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import software.amazon.awssdk.services.glue.model.GetDatabasesResponse;

@RestController
@RequestMapping("/glue")
public class GlueController {

    private final GlueService glueService;

    @Autowired
    public GlueController(GlueService glueService) {
        this.glueService = glueService;
    }

    @GetMapping("/databases")
    public GetDatabasesResponse getDatabases() {
        return glueService.getDatabases();
    }
}


PLEASE NOTE: if you do not have access to AWS accessKeyId and  secretAccessKey,. you can get an 
instance of glueClient using following code snippet

 GlueClient glueClient = GlueClient.builder()
                .region(region)
                .build();


To access a cross account DB, please use the folloiwng Example 
SELECT statement:

SELECT * FROM "glue:arn:aws:glue:us-east-1:999999999999:catalog".tpch1000.customer
 

Step 7: Run the Application

Run your Spring Boot application. You can access the Glue Data Catalog databases by navigating to http://localhost:8080/glue/databases.

This setup provides a basic Spring Boot service that reads from the AWS Glue Data Catalog. You can extend this to handle more Glue operations as needed