Module response 

Durable execution invocation output formatting.

The AWS Lambda Durable Execution service requires Lambda handlers to return a specific JSON envelope as their response, rather than the user’s plain JSON value. This module provides wrap_handler_result to convert the handler’s Result<serde_json::Value, DurableError> into the required format.

Protocol

The durable execution service validates the Lambda response and expects one of:

• {"Status": "SUCCEEDED", "Result": "<serialized-user-result>"} — execution completed
• {"Status": "FAILED", "Error": {"ErrorMessage": "...", "ErrorType": "..."}} — execution failed
• {"Status": "PENDING"} — execution suspended (wait/callback/retry/invoke)

The Result field in the SUCCEEDED case is a JSON string (the user’s result value serialized to a JSON string, then included as a string field).

Functions

wrap_handler_result

Wrap a handler result into the durable execution invocation output format.