feat: implement context snapshot fetch (Task 8)#2
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June 7, 2026 00:33
- Add context_fetcher.py with Prometheus and Docker socket queries - Implement fallback chain: Docker → Prometheus → unavailable - Query peer count and validator count based on client type - Integrate context snapshot into WebhookHandler before processing - Add 10 unit tests for context fetcher module - Update implementation plan to mark Task 8 complete
- Add Connection: close to Docker socket request to prevent hanging
- Remove broken Prometheus container fallback (up{container=...} doesn't work in eth-docker)
- Add nimbus and lodestar to validator count queries
- Add test assertion to verify Connection: close header is sent
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What this PR does
Implements Task 8: Context snapshot fetch for the webhook receiver.
Changes
webhook-receiver/src/webhook_receiver/context_fetcher.py_query_prometheus: Queries Prometheus for instant vector values (2s timeout)_get_docker_container_status: Queries Docker socket via Unix socket for container statefetch_context_snapshot: Orchestrates the fallback chain (Docker → "unavailable")WebhookHandler— context snapshot attached before dedup/storm protectiondocs/hermes-implementation-plan.mdto mark Task 8 completeReview Fixes (separate commit for easy review)
Connection: closeto Docker socket HTTP request to prevent indefinite hangingup{container=...}doesn't work in eth-docker)Connection: closeheader is sentTest results