Compose
The backend stack is included automatically when selecting the backend stack during /ipa-compose. Run the compose skill:
Select the backend stack when prompted for stacks to include. The compose skill generates the deployment Makefile with all required parameter wiring.
Configuration
Required Parameters
| Parameter | Type | Description |
|---|
Namespace | String | Project namespace prefix for resource naming. 1-12 characters, lowercase alphanumeric and hyphens, must start with a letter. |
Environment | String | Deployment environment. Allowed values: dev, staging, prod. |
ImageUri | String | Full ECR image URI including tag (e.g., 123456789012.dkr.ecr.us-east-1.amazonaws.com/repo:latest). |
AuthIssuer | String | OIDC issuer URL for JWT validation. Sourced from the Cognito stack IssuerUrl output. |
AuthAudience | String | OIDC client ID for JWT audience validation. Sourced from the Cognito stack UserPoolClientId output. |
Optional Parameters
| Parameter | Type | Default | Description |
|---|
FunctionName | String | fn | Logical function name for the backend Lambda. 1-24 characters, lowercase alphanumeric and hyphens. |
InvokeMode | String | RESPONSE_STREAM | Lambda invocation mode. Allowed values: BUFFERED, RESPONSE_STREAM. |
MemorySize | Number | 512 | Lambda memory allocation in MB. Range: 128-10240. |
Timeout | Number | 300 | Lambda timeout in seconds. Range: 1-900. |
ImageCommand | CommaDelimitedList | (empty) | Override container CMD (e.g., python,-m,handler). Leave empty to use the Dockerfile CMD. |
Feature Flags
| Flag | Default | Description |
|---|
EnablePassengersTable | false | Creates a DynamoDB table ({Namespace}_{Environment}_passengers) for passenger data. Adds a conditional least-privilege IAM policy to the Lambda execution role granting read/write access to the table. |
EnableSqsIntegration | false | Adds SQS SendMessage and GetQueueAttributes permissions to the Lambda execution role and injects the SQS_QUEUE_URL environment variable into the function. Also grants access to the convention-based jobs table ({Namespace}_{Environment}_jobs). Enabled automatically when the queue stack is also selected during composition. |
When EnableSqsIntegration is set to true, the following additional parameters become relevant:
| Parameter | Type | Default | Description |
|---|
SqsQueueUrl | String | (empty) | SQS queue URL injected as the SQS_QUEUE_URL environment variable. |
SqsSendQueueArns | String | (empty) | Comma-separated SQS queue ARNs for send permissions. |
Wiring
The backend stack receives values from upstream stacks. The compose skill wires these automatically in the generated Makefile.
| Backend Parameter | Source Stack | Source Output | Notes |
|---|
ImageUri | ECR | RepositoryUri | Append image tag (e.g., :latest) |
AuthIssuer | Cognito | IssuerUrl | OIDC issuer endpoint |
AuthAudience | Cognito | UserPoolClientId | OIDC client ID |
SqsQueueUrl | Queue | QueueUrl | Only when EnableSqsIntegration=true |
SqsSendQueueArns | Queue | QueueArn | Only when EnableSqsIntegration=true |
Outputs
| Output | Description | Export Name |
|---|
ApiUrl | HTTP API invoke URL (application entry point). Format: https://{api-id}.execute-api.{region}.amazonaws.com/prod | {StackName}-ApiUrl |
FunctionArn | Lambda function ARN | {StackName}-FunctionArn |
FunctionName | Lambda function name | {StackName}-FunctionName |
PassengersTableArn | DynamoDB passengers table ARN. Conditional -- only present when EnablePassengersTable=true. | {StackName}-PassengersTableArn |