Split the long proxy method into several smaller methods to improve maintainability
and testability. Each new method has a single responsibility:
- initializeUpstreams: handles upstream configuration setup
- tryCache: manages cache lookup logic
- tryUpstreams: coordinates upstream query attempts
- processUpstream: handles individual upstream query processing
- handleAllUpstreamsFailure: manages failure scenarios
- checkCache: performs cache checks and retrieval
- serveStaleResponse: handles stale cache responses
- shouldContinueWithNextUpstream: determines if failover is needed
- prepareSuccessResponse: formats successful responses
This refactoring:
- Reduces cognitive complexity
- Improves code testability
- Makes the DNS proxy logic flow clearer
- Isolates error handling and edge cases
- Maintains existing functionality
No behavioral changes were made.
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