go-lambda-error-handling

To handle Go Lambda errors safely, wrap causes with context and keep domain failures transport-agnostic. Map expected failures into safe API Gateway responses or SQS partial batch responses at the adapter boundary, preventing HTTP or SQS concerns from leaking into core logic.

The best way to map SQS retry behavior in Go Lambda is to classify failures as retryable or terminal. Use partial batch responses to preserve FIFO ordering and prevent reprocessing of successful items, ensuring only terminal errors stop the batch.

To return safe HTTP responses from API Gateway, map domain and application errors to appropriate status codes at the HTTP adapter boundary. Convert validation, conflict, and dependency failures into safe responses instead of generic Lambda errors.

Hexagonal architecture works well with Go AWS Lambda for error classification. It separates domain, application, and adapter boundaries, allowing you to map validation, conflict, dependency, retryable, and terminal failures correctly without string-based branching.

Go Lambda services return generic errors when causes are not wrapped with context. Implement explicit, inspectable error handling by wrapping causes at each boundary and classifying expected failures transport-agnostically for correct HTTP or SQS mapping.

You need partial batch SQS responses in Go Lambda when processing mixed success and failure batches. Classify retryable and terminal failures, return partial batch responses to preserve FIFO ordering, and avoid reprocessing successful items on retry.