Make interrupted document fetch retries preserve one import identity
A response drops after storage completes; retry publishes a second document with a different identity.
- Focused work estimate
- 5h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Idempotency · Storage lifecycle
Estimated field mix
- Storage systems40%
- Security30%
- Backend30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional knowledge service imports documents from customer-entered URLs. The importer follows redirects and trusts response metadata too broadly.
Setup prerequisites
- Build a local fetch adapter and controlled HTTP test servers.
- Use synthetic documents and deny network access outside the test allowlist.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- AFETCH-101 · Accept only explicitly supported document URL schemes
- AFETCH-102 · Bind document import requests to tenant-owned destination policies
- AFETCH-103 · Reject private and special-use destination addresses before connection
- AFETCH-104 · Revalidate every document redirect before following it
- AFETCH-105 · Enforce byte and time limits while streaming imported documents
- AFETCH-106 · Validate document type from bytes before publishing the import
Acceptance criteria
- Use a stable import command identity and staged object generation.
- Publish at most one completed object per command.
- Changed URL or policy version under the same key conflicts.
Implementation constraints
- Persist publication and completion state atomically.
Verification to include
- Drop the response after publication and retry to the same import.
- Interrupt a stream and verify its incomplete generation cannot be published.
Deliverables
- Idempotent import completion and fault probe
Rollout and recovery
Canary one synthetic tenant; stop completion and inspect staging generations on inconsistency.
Value of the work
For the engineer: Practice defensive URL handling and bounded untrusted-input processing.
For the team: Review whether integrations can import content without expanding infrastructure access.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.