gtxu opened a new pull request, #70960:
URL: https://github.com/apache/airflow/pull/70960
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Service discovery systems with dynamic port mapping (like AWS Service
Discovery for ECS) often define external services using DNS SRV records.
Currently, reaching these services from Airflow requires routing traffic
through a static load balancer.
This pull request allows HttpHook and HttpAsyncHook
to dynamically discover target hosts and ports using DNS SRV records.
Instead of connecting to a stale IP, the hooks resolve the service
name Just-In-Time (JIT) before making the request.
This change introduces `dnspython` as an optional dependency to keep
the core HTTP provider lightweight. To prevent DNS query flooding,
a TTL cache mechanism is implemented.
- Implemented soft dependency via the `srv` extra.
- Built RFC 2782 compliant failover (lowest priority tier filtering
and random target selection).
- Added concurrency-safe TTL caching (`srv_cache_ttl`) using
`asyncio.Lock` to prevent cache stampedes in asynchronous contexts.
- Exposed `srv_lookup` and `srv_cache_ttl` configuration directly
in the Airflow Connection UI via custom form widgets.
closes: #9186
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##### Was generative AI tooling used to co-author this PR?
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- [X] Yes - Claude Sonnet 5
Generated-by: Claude Sonnet 5 following [the
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