fix(dash-spv): extend the CFHeaders queue from the tick, not only on a header event - #964
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romchornyi wants to merge 5 commits into
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fix(dash-spv): extend the CFHeaders queue from the tick, not only on a header event#964romchornyi wants to merge 5 commits into
romchornyi wants to merge 5 commits into
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…a header event `handle_new_headers` is the only thing that ever extends the filter-header queue, and it runs solely off `BlockHeaderSyncComplete` and `BlockHeadersStored`. Block-header storage can advance without either reaching this manager: a segment completing out of order promotes a run of buffered headers, and on a long scan that is how the last stretch of the chain lands. When that happens the manager keeps the target it was last told about, its queue drains, and nothing re-arms it. Filter headers then stop for good while block headers, ChainLocks and inv announcements carry on — so the client looks alive while sync is frozen, which is what makes this hard to spot from the outside. Observed on a mainnet restore: the queue was last extended to height 2_398_000 at 19:12:58, block headers reached 2_523_515 at 19:36:48, and filter headers never moved again — filters and blocks stuck at 95% with `last_activity` climbing past twenty minutes. The tick now re-reads the tip from storage and calls `handle_new_headers` when it has moved past what this manager knows. Same shape as promoting finished header segments from the tick (#960): trust the tick, not the message. The regression test drives exactly that sequence — storage advances with no event delivered — and fails without this change.
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Included review availability: Your plan includes up to 3 reviews per rolling hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe filter-header synchronization manager now reads the stored block-header tip during ChangesFilter header progress resynchronization
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change lets filter-header synchronization resume when stored block headers advance without an event, with targeted and full-suite tests reported passing. No actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant FilterHeadersSyncManager
participant FilterHeadersManager
participant BlockHeaderStorage
FilterHeadersSyncManager->>FilterHeadersManager: stored_block_header_tip()
FilterHeadersManager->>BlockHeaderStorage: read stored block-header tip
BlockHeaderStorage-->>FilterHeadersManager: return advanced tip
FilterHeadersManager-->>FilterHeadersSyncManager: return advanced tip
FilterHeadersSyncManager->>FilterHeadersSyncManager: handle_new_headers()
FilterHeadersSyncManager-->>FilterHeadersSyncManager: queue CFHeaders request
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## dev #964 +/- ##
==========================================
+ Coverage 76.90% 76.91% +0.01%
==========================================
Files 329 329
Lines 82407 82469 +62
==========================================
+ Hits 63373 63433 +60
- Misses 19034 19036 +2
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romchornyi
marked this pull request as ready for review
August 18, 2026 10:38
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Inline comments:
In `@dash-spv/src/sync/filter_headers/manager.rs`:
- Line 412: Extend the test using create_test_request_sender and
handle_new_headers to receive and assert the expected CFHeaders request for the
newly discovered range, including its requested height range and relevant filter
type. Keep the existing block_header_tip_height assertion and verify the request
is emitted after the queue is initialized or extended.
In `@dash-spv/src/sync/filter_headers/sync_manager.rs`:
- Around line 159-176: Rename the pull request title to use the supported
semantic prefix: “fix: resynchronize filter-header progress”.
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Fix all unresolved CodeRabbit comments on this PR:
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dash-spv/src/sync/filter_headers/manager.rsdash-spv/src/sync/filter_headers/sync_manager.rs
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…he tip The tip assertion alone was too weak to protect the fix. `handle_new_headers` updates `block_header_tip_height` before it touches the pipeline, so a version that noticed the advance and then queued nothing would still have passed — and would have left sync exactly as frozen as the bug it is meant to close. The test now drains the request channel and requires at least one `GetCFHeaders`, then checks every stop hash against the headers in the newly discovered range, so a request rebuilt from the stale target cannot satisfy it either. Still falsifiable: with the tick branch removed the test fails, now on the tip assertion first.
…ick' into fix/filter-headers-resume-from-tick
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Issue being fixed or feature implemented
Filter-header sync can stop permanently mid-scan and never resume, while the client keeps looking healthy.
handle_new_headersis the only thing that ever extends the CFHeaders queue, and it runs solely offBlockHeaderSyncCompleteandBlockHeadersStored. Block-header storage can advance without either reaching this manager — a segment completing out of order promotes a run of buffered headers, and on a long scan that is how the last stretch of the chain lands. When that happens the manager keeps the target it was last told about, its queue drains, and nothing re-arms it.Block headers, ChainLocks and inv announcements carry on normally, so from the outside the client looks alive while sync is frozen.
Observed on a mainnet restore:
Segment 38: complete)Filters and blocks sat at 95% with
last_activityclimbing past twenty minutes. The wallet's transactions stop arriving at that point, because the persisted watermark cannot advance past the filter frontier.Same shape as #960 (promote finished header segments from the tick, not only on a message), in the neighbouring pipeline.
What was done?
tick()re-reads the block-header tip from storage and callshandle_new_headerswhen it has moved past what this manager was last told. Addedstored_block_header_tip()on the manager for that read — the storage handle is private to the sibling module, and this keeps it that way rather than widening the field.No change to the event paths; this is purely an additional way in.
How Has This Been Tested?
test_tick_extends_when_storage_tip_advanced_without_an_eventdrives exactly the failing sequence: a manager mid-sync that was last told the tip was 1000, storage advanced past that with no event delivered, then onetick.The test is falsifiable and was checked both ways:
sync_manager.rsstashed — fails withtick must pick up a tip that advanced without an eventFull
dash-spvlib suite: 556 passed, 0 failed, 2 ignored.Not yet verified end-to-end on mainnet. The mechanism is covered by the unit test, and an app-level run over a patched local checkout completed normally, but that run was on testnet — the network where the stall was originally observed has not been re-run against this build. Keeping this as a draft for that reason.
Breaking Changes
None. Additive: one new private-to-module accessor and an extra branch in
tick.Checklist
For repository code-owners and collaborators only
Summary by CodeRabbit