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fix: prune empty topic entries from topics map - #543
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@lodekeeper please open this PR against the js-libp2p monorepo. This repo will soon be archived |
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Reopened this against the js-libp2p monorepo here:\n\n- libp2p/js-libp2p#3405\n\nThis is the same empty-topic pruning fix from this PR, ported under |
nflaig
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Mar 13, 2026
## Summary Open the Lodestar side of the memory-leak mitigation by clearing composed response-timeout signals in req/resp request handling. This is the Lodestar-local follow-up for the network-thread leak investigation in #8969. It addresses the req/resp timeout-signal retention path by replacing the `AbortSignal.any(...)` composition with a clearable composed signal and explicitly clearing listeners once the response stream is done. This PR is intentionally scoped to the req/resp fix only. The separate residual gossipsub topic-retention issue is being tracked upstream in `ChainSafe/js-libp2p-gossipsub#543`, and we can pick that up once a new libp2p release lands. ## Change - add `createRespSignal()` helper in `packages/reqresp/src/request/index.ts` - compose request signal + timeout signal via an `AbortController` - remove abort listeners explicitly via `respSignal.clear()` after the response closes ## Validation - `pnpm build` - `pnpm lint` *(warning-only: pre-existing unused biome suppression in `packages/light-client/test/unit/webEsmBundle.browser.test.ts`)* ## AI disclosure This PR was authored with AI assistance (Lodekeeper 🌟). --------- Co-authored-by: lodekeeper <lodekeeper@users.noreply.github.com>
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Summary
Fix a
topicsmap retention bug in gossipsub.When a remote peer unsubscribed from a topic, or disconnected after being the last subscriber for a topic, the internal
topics: Map<TopicStr, Set<PeerIdStr>>entry was left behind as an emptySet. Over time this let topic strings accumulate indefinitely.This patch:
topicsentries on remote unsubscribetopicsentries on peer disconnecttopicsentries from unsubscribe-only updatesCloses #542.
Details
The minimal fix is intentionally scoped to
topicsonly.I did not prune
meshentries in the same change becausemeshis local joined-topic state and deleting empty mesh topics on disconnect would interfere with heartbeat maintenance/regrafting.fanoutalready has TTL cleanup, andbackoffalready self-prunes empty per-topic maps.Testing
pnpm test -- --target node --grep 'topic entries|unsubscribe-only'pnpm lintAI disclosure
Initial heap analysis and patch drafting were assisted by AI tooling, then validated with local source inspection and test runs.