Asynchronous Form Schema Discovery: Idempotent Retries and Secure Temporary Files
Use a durable job record as the unit of work for form schema discovery: validate the document at admission, submit one asynchronous extraction job under a correlation ID, poll it with bounded retries, and treat the temporary files on disk as scratch space that nothing downstream is allowed to trust. In a healthtech service that watermarks discharge packets before they go to an outside clinic, the…
Implement asynchronous form schema discovery using idempotent retries and secure temporary files. Begin by submitting the form extraction as a dedicated asynchronous job via POST /v1/pdf/form/extract, then persist the returned job identifier. Poll the job status using GET /v1/pdf/job/get/{job_id} with exponential backoff, jitter, and a deadline derived from your sharing SLO.
Always honor Retry-After headers to prevent overwhelming the system. Implement robust validation at the point of admission, checking MIME type, page count, byte size, and ensuring they comply with policy. Reject oversized or malformed uploads immediately to avoid latency amplification during peak traffic. Create a unique private working directory for each correlation ID using 0700 permissions, keeping input and output files separate and deleting the scratch directory upon completion.
Store the manifest, containing correlation ID, upstream job ID, MIME type, page count, size, digests, policy version, render decision, and timestamps, for at least 30 days. This manifest outlives the temporary files, providing a reliable audit trail for downstream processing and compliance checking.
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