fix(dash-spv): persist the masternode messages and replay them on start - #1073
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Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant SyncManager
participant MasternodesManager
participant PersistentMasternodeStorage
participant DashSpvClient
participant MasternodeListEngine
SyncManager->>MasternodesManager: Process QRInfo and MnListDiff messages
MasternodesManager->>PersistentMasternodeStorage: Store QRInfo and successfully applied diffs
DashSpvClient->>PersistentMasternodeStorage: Load engine on restart
PersistentMasternodeStorage->>MasternodeListEngine: Replay stored messages
PersistentMasternodeStorage-->>DashSpvClient: Return rebuilt engine
Possibly related PRs
Merge Risk: ⚪ Minimal · up to Replay now excludes stored messages from orphaned blocks, and the QRInfo helper preserves its previous behavior. The change is mergeable after normal checks. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Restart replay improves availability, but it can install an incomplete reconstructed state without distinguishing that state from a complete replay. Downstream signature checks limit the apparent security impact; recovery before all consumers use the state remains uncertain. Retained concerns
Security review detailsSecurity Blast Radius
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✅ Passed checks (4 passed)
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## dev #1073 +/- ##
==========================================
+ Coverage 77.75% 77.81% +0.06%
==========================================
Files 317 317
Lines 80829 81118 +289
==========================================
+ Hits 62845 63125 +280
- Misses 17984 17993 +9
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…has pruned it The masternode list engine keeps only the lists within its retention window, so a Platform proof at an older height, or one whose quorum retired before the oldest list kept, no longer resolves from memory. The stored masternode messages still hold those lists. `DashSpvClient::get_quorum_at_height` now falls back to the storage when the engine does not resolve the quorum, and `ffi_dash_spv_get_quorum_public_key` goes through it, so Platform's lookups work at any height the SPV has stored. `MessageLog::quorum_entry_at_or_before` replays the messages stored up to six rotation cycles above the height (a QRInfo builds lists back to its h-4c work block) and looks the quorum up after each one, keeping the hit from the highest list, so a list the window drops later in the replay still counts. The lookup replays from a `MessageLog`, a copy of the message index taken under the storage lock and released before the replay, so a long replay does not hold up the masternode sync storing the next message. The replay locks the header storage per message instead of for the whole pass. The start-up replay goes through the same log. Known limit: the replay starts from the first stored message, so a lookup that misses memory costs a replay of history. Test: a Platform quorum mined at 1 and retired at 2, followed by a diff per block to 2500, past the regtest window (2304): the engine a restart loads does not resolve it at 100, the storage lookup does, and an unknown quorum misses in both. Stacked on fix/masternode-persist-across-restarts (#1073). Verified: fmt, clippy --workspace --all-features --all-targets -D warnings, dashcore 626, dash-spv 579 + dashd_masternode 10 + dashd_sync 32, dash-spv-ffi 49 + dashd_sync 7. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Inline comments:
In @dash-spv/src/storage/masternode.rs:
- Around line 145-207: Update replay’s planning loop to skip Diff and QrInfo
messages when their tip block hash does not resolve through headers to the
message’s stored height; only feed valid messages into the engine or add them to
the plan. Apply the check before feed_qrinfo_heights_to_engine for QrInfo and
before feed_block_height for Diff.
In @dash-spv/src/storage/mod.rs:
- Around line 256-269: Update the storage-reopen flow in
DashSpvClient::clear_storage to rebuild the sync managers, including
MasternodesManager, using the reopened storage handles before synchronization
can resume. Ensure the managers no longer retain handles or engines from before
the storage was cleared.
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📒 Files selected for processing (11)
dash-spv/src/client/lifecycle.rsdash-spv/src/storage/masternode.rsdash-spv/src/storage/mod.rsdash-spv/src/storage/types.rsdash-spv/src/sync/masternodes/manager.rsdash-spv/src/sync/masternodes/sync_manager.rsdash-spv/tests/dashd_masternode/helpers.rsdash-spv/tests/dashd_masternode/setup.rsdash-spv/tests/dashd_masternode/tests_sync.rsdash/src/sml/masternode_list_engine/mod.rsdash/src/test_utils/sml.rs
💤 Files with no reviewable changes (1)
- dash-spv/src/storage/types.rs
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…has pruned it The masternode list engine keeps only the lists within its retention window, so a Platform proof at an older height, or one whose quorum retired before the oldest list kept, no longer resolves from memory. The stored masternode messages still hold those lists. `DashSpvClient::get_quorum_at_height` now falls back to the storage when the engine does not resolve the quorum, and `ffi_dash_spv_get_quorum_public_key` goes through it, so Platform's lookups work at any height the SPV has stored. `MessageLog::quorum_entry_at_or_before` replays the messages stored up to six rotation cycles above the height (a QRInfo builds lists back to its h-4c work block) and looks the quorum up after each one, keeping the hit from the highest list, so a list the window drops later in the replay still counts. The lookup replays from a `MessageLog`, a copy of the message index taken under the storage lock and released before the replay, so a long replay does not hold up the masternode sync storing the next message. The replay locks the header storage per message instead of for the whole pass. The start-up replay goes through the same log. Known limit: the replay starts from the first stored message, so a lookup that misses memory costs a replay of history. Test: a Platform quorum mined at 1 and retired at 2, followed by a diff per block to 2500, past the regtest window (2304): the engine a restart loads does not resolve it at 100, the storage lookup does, and an unknown quorum misses in both. Stacked on fix/masternode-persist-across-restarts (#1073). Verified: fmt, clippy --workspace --all-features --all-targets -D warnings, dashcore 626, dash-spv 581 + dashd_masternode 10 + dashd_sync 32, dash-spv-ffi 49 + dashd_sync 7. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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`PersistentMasternodeStateStorage` was never called: nothing stored the masternode state and `DashSpvClient::new` always built an empty engine, so every restart re-synced the masternode lists from the network (#988), and Platform lookups and InstantSend verification had nothing to work with until it did. The storage now keeps the two network messages that build the engine, one file per message and height (`masternodes/diff_<h>.dat`, `qrinfo_<h>.dat`, atomic writes, indexed on open), and `load_engine` rebuilds the engine by replaying them before the client touches the network: - the masternode manager stores a QRInfo at its tip height and an MnListDiff at its target height once the engine has applied it; a write that fails is logged and only costs a re-sync of that message on the next start; - the replay runs the path the live sync does: QRInfo heights through `feed_qrinfo_heights_to_engine` (moved into storage for that), diff heights from the file name and the header storage; - messages apply in the order of their newest base, so a diff built on a list a QRInfo produced comes after that QRInfo whatever their heights; a message whose base never appears is skipped and left to the network, and an unreadable file is skipped too; - heights resolve against the header storage, injected at construction, so there is one height mapping and it is the one the header chain keeps; - a message whose block (a QRInfo's tip) is not at its height in the header chain is skipped: a reorg truncates the headers but leaves the files of orphaned blocks on disk until a new message replaces them, and replaying one would rebuild a list for a block no longer in the chain, which the masternode manager would then request its next diff from; - once replayed, the newest list's non-rotating quorums are verified, as the live sync does when a pipeline completes. `MasternodeState`, `storage/types.rs` and the dead state storage go away. `StorageManager::masternodes()` exposes the storage. Tests: - `test_masternode_list_sync_with_restart` (dashd) now reads the engine the restarted client built before it touches the network and requires the first session's tip list back, and requires every storage directory the first session earned to be on disk and not to shrink across the restart. It fails on dev, where the engine comes back empty and `masternodes/` is never written. - storage unit tests: a reopened storage replays what was stored, an orphan diff is skipped and the next one still applies, a message whose block left the header chain is skipped, the replay verifies the newest list's non-rotating quorums, a second write at one height wins, unreadable files and foreign names do not fail the load, a QRInfo's base is the list its diff chain starts from. Known limit: the replay reads every message stored since the first sync, so start-up time grows with uptime (about 14.7 s after 10 days of mainnet diffs, measured in pr-993); keeping it bounded is a separate change. Verified: fmt, clippy --workspace --all-features --all-targets -D warnings, dashcore 626, dash-spv 580 + dashd_masternode 10 + dashd_sync 32, dash-spv-ffi 49 + dashd_sync 7. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…has pruned it The masternode list engine keeps only the lists within its retention window, so a Platform proof at an older height, or one whose quorum retired before the oldest list kept, no longer resolves from memory. The stored masternode messages still hold those lists. `DashSpvClient::get_quorum_at_height` now falls back to the storage when the engine does not resolve the quorum, and `ffi_dash_spv_get_quorum_public_key` goes through it, so Platform's lookups work at any height the SPV has stored. `MessageLog::quorum_entry_at_or_before` replays the messages stored up to six rotation cycles above the height (a QRInfo builds lists back to its h-4c work block) and looks the quorum up after each one, keeping the hit from the highest list, so a list the window drops later in the replay still counts. The lookup replays from a `MessageLog`, a copy of the message index taken under the storage lock and released before the replay, so a long replay does not hold up the masternode sync storing the next message. The replay locks the header storage per message instead of for the whole pass. The start-up replay goes through the same log. Known limit: the replay starts from the first stored message, so a lookup that misses memory costs a replay of history. Test: a Platform quorum mined at 1 and retired at 2, followed by a diff per block to 2500, past the regtest window (2304): the engine a restart loads does not resolve it at 100, the storage lookup does, and an unknown quorum misses in both. Stacked on fix/masternode-persist-across-restarts (#1073). Verified: fmt, clippy --workspace --all-features --all-targets -D warnings, dashcore 626, dash-spv 581 + dashd_masternode 10 + dashd_sync 32, dash-spv-ffi 49 + dashd_sync 7. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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PersistentMasternodeStateStoragewas never called: nothing stored the masternode state andDashSpvClient::newalways built an empty engine, so every restart re-synced the masternode lists from the network (#988), and Platform lookups and InstantSend verification had nothing to work with until it did.The storage now keeps the two network messages that build the engine, one file per message and height (
masternodes/diff_<h>.dat,qrinfo_<h>.dat, atomic writes, indexed on open), andload_enginerebuilds the engine by replaying them before the client touches the network:feed_qrinfo_heights_to_engine(moved into storage for that), diff heights from the file name and the header storage;MasternodeState,storage/types.rsand the dead state storage go away.StorageManager::masternodes()exposes the storage.Tests:
test_masternode_list_sync_with_restart(dashd) now reads the engine the restarted client built before it touches the network and requires the first session's tip list back, and requires every storage directory the first session earned to be on disk and not to shrink across the restart. It fails on dev, where the engine comes back empty andmasternodes/is never written.Known limit: the replay reads every message stored since the first sync, so start-up time grows with uptime (about 14.7 s after 10 days of mainnet diffs, measured in pr-993); keeping it bounded is a separate change.
Verified: fmt, clippy --workspace --all-features --all-targets -D warnings, dashcore 620, dash-spv 578 + dashd_masternode 10 + dashd_sync 32, dash-spv-ffi 49 + dashd_sync 7.
PR Hygiene ·
7c4c63c/self-revieweddash-spv(dash-spv/src/client/lifecycle.rs,dash-spv/src/storage/masternode.rs,dash-spv/src/storage/mod.rsand 6 more) — QuantumExplorer or xdustinfacedash/src/sml/masternode_list_engine/mod.rs,dash/src/test_utils/sml.rs) — QuantumExplorer or xdustinfaceWhen every box is checked the
PR Hygienecheck passes and this can merge.Summary by CodeRabbit
New Features
Reliability