Address review on #1306:
- Only close enrChangeCh once wg.Wait() completes; on timeout leave it open
to avoid a send-on-closed-channel panic from still-running node goroutines.
- Convert stopWithTimeout to a *WakuNode method using w.log (per review).
- Reword the cancel comment to not reference a non-existent processLoop symbol.
Signed-off-by: kblinichkin <kirill.blinichkin@gmail.com>
Sustained subscribe failures saturated CPU, leaked 600+ subscriptionLoop
goroutines, and twice panicked with `strings: Join output length overflow`.
Five independent issues:
- api/filter: errcnt budget was gated on `possibleRecursiveError`, which
matched only `ErrNoPeersAvailable` / `swarm.ErrDialBackoff`. The dominant
error class never incremented errcnt, so the 3-error-per-5s budget was
dead code. Replaced gate with `shouldIncrementErrCnt(err)`: counts every
non-nil error.
- protocol/filter: WakuFilterLightNode.Subscribe flattened per-peer errors
via `fmt.Errorf+strings.Join`, losing typed *FilterError and growing
unboundedly. Replaced with typed `*SubscribeError` (PeerID, ContentTopics,
Err) plus `HasRateLimitError()`; `Error()` is hard-capped. Concurrent
per-peer appends now mutex-guarded.
- api/filter: 60-s rate-limit backoff on `*SubscribeError.HasRateLimitError()`.
`shouldHonourRateLimitBackoff(rateLimitedUntil, now)` gates ticker push and
closing-channel checkAndResubscribe. Cleared on subscribe success.
- api/filter: FilterManager.waitingToSubQueue was a cap-100 chan written and
drained under the same lock, deadlocking the manager once full. Replaced
with mutex-guarded slice.
- api/filter: Sub.cleanup closed DataCh while multiplex forwarders could
still be sending. Added multiplexWG awaited in cleanup; forwarder send is
in a select with apiSub.ctx.Done() so it can't deadlock when
subDetails.C is never closed (node-stop transitions).
Tests (all under -race):
- TestSub_CleanupRaceWithMultiplex (50 iter)
- TestSub_CleanupDoesNotDeadlockWhenSubChannelStaysOpen
- TestFilterManager_SubscribeFilter_DoesNotDeadlockWhenQueueFull
- TestShouldIncrementErrCnt
