lambda

Lambda Example

A practical example that includes a Lambda function and DynamoDB table.

Configuration

This stack includes the following resources:

• DynamoDB Table: Table for storing items
• Lambda Function: Simple function with Python 3.12 runtime
• IAM Role: Lambda execution role with DynamoDB access permissions
• IAM Policy: Read/write permissions for the DynamoDB table

Features Tested in cdkd

1. Lambda Asset Publishing: Code from lambda/ directory is uploaded to S3
2. Ref in Environment Variables: DynamoDB table name is referenced in the TABLE_NAME environment variable
3. Resource Dependencies: Lambda → DynamoDB → IAM Role dependency chain
4. Automatic IAM Policy Generation: Policy creation via grantReadWriteData()
5. Fn::GetAtt: Retrieve Lambda ARN and DynamoDB ARN in outputs

Deploy

# Install packages
vp install

# Deploy with cdkd
node ../../../dist/cli.js deploy \
  --app "node bin/app.ts" \
  --state-bucket <your-state-bucket> \
  --region us-east-1 \
  --verbose

Test Points

• Lambda assets are correctly published to S3
• DynamoDB table is created
• Lambda function is created with the correct role attached
• Environment variable TABLE_NAME is set to the table name
• IAM Policy is correctly created and attached to Lambda execution role
• Outputs are correctly resolved (function name, ARN, etc.)

Clean up

node ../../../dist/cli.js destroy \
  --state-bucket <your-state-bucket> \
  --stack LambdaStack \
  --region us-east-1 \
  --force