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feat(wallet)!: wallet truncate above - #1104
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughFork recovery now truncates wallet state before stored chain data. Wallet truncation restores eligible spent outputs, retains InstantSend-locked transactions as unconfirmed, and emits a ChangesFork recovery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ForkRecovery
participant WalletManager
participant ManagedWalletInfo
participant WalletEventCallbacks
ForkRecovery->>WalletManager: truncate_above(fork_height)
WalletManager->>ManagedWalletInfo: truncate_above(height)
ManagedWalletInfo-->>WalletManager: truncation results and updated balances
WalletManager-->>WalletEventCallbacks: ChainTruncated event
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Fork recovery may be rejected or left partially complete after a storage failure. Resolve these open concerns before merging. Security Architecture ReviewSecurity architecture risk: 🟠 High · up to The native callback layout becomes incompatible with previously compiled callers. Fork recovery also emits truncation notifications between stopping and restarting their forwarding task, which can leave external wallet mirrors inconsistent. Deployment compatibility and durable recovery guarantees remain incompletely established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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After a fork, the client truncates its storage at the fork height and syncs the new branch, but the wallets kept everything they recorded from the dropped blocks: their transactions and UTXOs stayed confirmed, and their synced height stayed above the fork, so the filters of the new branch below it were never scanned for them. `WalletInfoInterface::truncate_above` removes the transactions recorded in blocks above the height, with the UTXOs they created, the spends observed in them, and lowers the synced and last-processed heights to it. The coins those transactions spent are unspent again: each funds account keeps the UTXOs removed by spends not yet chainlocked, pruned once the spend is chainlocked, since a fork never goes below a ChainLock and the funding record of a chainlocked transaction is dropped. `WalletInterface::truncate_above` applies it to every wallet and emits a `WalletEvent::ChainTruncated` per wallet with the removed txids and the restored outpoints, so a persister can drop the rows above the fork. The FFI forwards it through `on_chain_truncated`. The client calls it when it handles a fork. Truncating a storage below its start height now drops everything instead of failing. The block storage starts at its first stored block, so a fork right below it made the recovery fail with the client stopped. `test_sync_follows_reorg` replaces a block that pays a coinbase to the wallet and spends a wallet coin: afterwards only the funding coin is left, unspent, and the event names what to drop and restore. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## dev #1104 +/- ##
==========================================
- Coverage 77.96% 77.96% -0.01%
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Files 302 302
Lines 79049 79371 +322
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+ Hits 61634 61884 +250
- Misses 17415 17487 +72
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Inline comments:
Review comments at @dash-spv-ffi/src/callbacks.rs:
- Line 1019: The added on_chain_truncated field changes the existing callbacks
struct layout and can misinterpret old callers’ user_data. Preserve the original
layout and dash_spv_ffi_client_new ABI; expose ChainTruncated handling through a
separately versioned callbacks struct and entrypoint.
Review comments at
@key-wallet/src/managed_account/managed_core_funds_account.rs:
- Around line 1395-1396: Update `Deserialize` handling for `unsettled_spends` to
rebuild the legacy cache from persisted transaction records when the field is
absent. For spends above the fork height whose funding transaction is at or
below it, reconstruct each `Utxo` from the recorded parent transaction output
and wallet input details so `truncate_above` can restore the spent coin.
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📒 Files selected for processing (23)
dash-spv-ffi/src/bin/ffi_cli.rsdash-spv-ffi/src/callbacks.rsdash-spv-ffi/tests/dashd_sync/callbacks.rsdash-spv/src/client/lifecycle.rsdash-spv/src/storage/block_headers.rsdash-spv/src/storage/blocks.rsdash-spv/src/storage/filter_headers.rsdash-spv/src/storage/filters.rsdash-spv/src/storage/segments.rsdash-spv/tests/dashd_sync/helpers.rsdash-spv/tests/dashd_sync/tests_fork.rsdash-spv/tests/dashd_sync/tests_transaction.rskey-wallet-manager/src/event_tests.rskey-wallet-manager/src/events.rskey-wallet-manager/src/process_block.rskey-wallet-manager/src/test_utils/mock_wallet.rskey-wallet-manager/src/wallet_interface.rskey-wallet/src/managed_account/managed_core_funds_account.rskey-wallet/src/tests/mod.rskey-wallet/src/tests/observed_spent_outpoints_tests.rskey-wallet/src/tests/truncate_above_tests.rskey-wallet/src/wallet/managed_wallet_info/mod.rskey-wallet/src/wallet/managed_wallet_info/wallet_info_interface.rs
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Few things to look at:
- A held spend-first coin is lost once its spend block is replayed. After the funding arrives,
reapply_heightsreplays the spend, its input matches viaspent_before_funded, andupdate_utxosdrops that entry without pushing it intounsettled_spends(managed_core_funds_account.rs:409). A fork that then drops the spend restores nothing. Push the heldUtxoas well, and extendtruncate_above_restores_a_held_output_whose_spend_it_dropsto replay before truncating. - A spend-first coin in the same account is lost too. When the funding arrives after its spend was recorded in that account, the
is_outpoint_spentbranch skips the output (managed_core_funds_account.rs:333), so it lands in no map and cannot be restored. File it under the spender's txid there. - Nothing enforces "a fork never goes below a ChainLock".
fork_height(block_headers/manager.rs:185) fires on any unstored header whose parent is stored below the tip, before validation or a ChainLock check. Below a ChainLock, truncation drops provider payload records whose txids stay infinalized_txids, so they are never rebuilt, and withkeep-finalized-transactionsit drops chainlocked spends without restoring their coins. Clamptruncate_aboveatlast_applied_chain_lock, or ignore such forks inhandle_fork. unsettled_spendsleaks. A spend-only mempool transaction later mined in an already chainlocked block goes throughpromote_stored_transaction_context, which finalizes the record but never clears its entry. The field is persisted, so it only grows. Clear it there.- A storage error skips the wallet truncation for good. If one of the storage
truncate_abovecalls inhandle_forkfails,?returns before the wallet is touched. The next run sees no fork because the headers are already truncated, so the wallet keeps its stale records and a synced height above the fork. The wallet truncation needs to happen even when storage fails. - InstantSend-locked spends get their inputs back as spendable. The lock is final for the txid and the network will mine it again, but until then coin selection can build a transaction that conflicts with our own lock. Keep the inputs of a dropped IS-locked transaction spent, ideally by moving the record back to unconfirmed instead of deleting it.
ChainTruncated.heightis the fork height, not the wallet's new synced height. The wallet storesmin(synced, fork), but the docs (events.rs:307,callbacks.rs:836) say to lower the synced height toheight, which raises it for a wallet that was behind. Emitinfo.synced_height()or reword the docs.
And those... probably don't matter:
on_chain_truncatednever fires over FFI.handle_forktruncates the wallet (lifecycle.rs:281) afterstop_lockedhas joined the old wallet event monitor, andrun_lockedonly subscribes the new one later (sync_coordinator.rs:62), so noEventHandlerever seesChainTruncated. Truncate after the monitors subscribe and beforestart_sync, and assert the event through the handler intest_sync_follows_reorg.- This is a breaking change.
WalletInterface::truncate_abovehas no default andFFIWalletEventCallbackschanges layout, so the title should befeat(wallet)!: ..., like #1093.
A branch off below the best persisted ChainLock is no fork: the blocks it locks are final, so storage and wallets are left as they are. `MetadataStorage::load_metadata` now deserializes the stored JSON value. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`truncate_above` fails and changes nothing when the height is below a wallet's applied ChainLock; `WalletManager` checks every wallet first, so a refused truncation leaves all of them as they are. A fork now truncates the wallets before storage and always restarts the client, so a storage failure keeps the fork unstored and it is detected and retried. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…he fork A wallet behind the fork has nothing to drop, so it is left as it is and gets no `ChainTruncated`. The event docs now lower a synced height to the fork height only when it is above it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A spend first seen in the mempool and then in a chainlocked block is final, so its `unsettled_spends` entry is dropped instead of kept forever. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… drops its block An InstantSend lock is final for the txid and the network mines it again, so its record goes back to the mempool, its outputs stay InstantSend-locked and the coins it spent stay spent instead of becoming selectable. `ChainTruncated` reports such transactions in `unconfirmed_txids`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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An output spent before it was funded, whether held in `spent_before_funded` or spent by a transaction the account recorded first, is now kept in `unsettled_spends` under its spend, so a fork dropping the spend gives it back. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @dash-spv/src/client/lifecycle.rs:
- Around line 288-289: Update the truncation error branch in handle_fork to
return or propagate the error without calling run_locked, so synchronization
remains stopped when a truncation fails.
Review comments at @dash-spv/src/sync/block_headers/manager.rs:
- Line 213: Update the fork check in the `chain_lock` handling to compare the
stored header hash with `chain_lock.block_hash`; when they differ, recover
toward the ChainLocked branch instead of rejecting every fork below
`chain_lock.block_height`. Add a test covering a ChainLock saved before its
header, followed by storage of a conflicting branch through the ChainLock
height.
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📒 Files selected for processing (22)
dash-spv-ffi/src/bin/ffi_cli.rsdash-spv-ffi/src/callbacks.rsdash-spv/src/client/lifecycle.rsdash-spv/src/storage/metadata.rsdash-spv/src/storage/mod.rsdash-spv/src/sync/block_headers/manager.rsdash-spv/src/sync/chainlock/manager.rsdash-spv/src/sync/mod.rskey-wallet-ffi/src/error.rskey-wallet-manager/src/error.rskey-wallet-manager/src/event_tests.rskey-wallet-manager/src/events.rskey-wallet-manager/src/process_block.rskey-wallet-manager/src/test_utils/mock_wallet.rskey-wallet-manager/src/wallet_interface.rskey-wallet/src/error.rskey-wallet/src/managed_account/managed_core_funds_account.rskey-wallet/src/tests/observed_spent_outpoints_tests.rskey-wallet/src/tests/truncate_above_tests.rskey-wallet/src/transaction_checking/wallet_checker.rskey-wallet/src/utxo.rskey-wallet/src/wallet/managed_wallet_info/wallet_info_interface.rs
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Comment on lines
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| if let Err(e) = truncated { | ||
| tracing::warn!("Fork at height {} not followed: {}", fork_height, e); |
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🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win
🔎 Supported by static analysis
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#!/bin/bash
set -e
printf '%s\n' '--- diff ---'
git diff --no-ext-diff --unified=50 5628202e401185b5353426082313885ef347729c 3c0da64d3112069d9f78deeaba99b1d23470e756 -- dash-spv/src/client/lifecycle.rs
printf '%s\n' '--- lifecycle source ---'
git show 3c0da64d3112069d9f78deeaba99b1d23470e756:dash-spv/src/client/lifecycle.rs | nl -ba | sed -n '220,330p'
printf '%s\n' '--- fork detector references ---'
rg -n -F -- 'fork_height' dash-spv/src/sync dash-spv/src/client
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rg -n -F -- 'parent' dash-spv/src/sync/block_headers/manager.rsRepository: dashpay/rust-dashcore
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printf '%s\n' '--- fork detector ---'
git show 3c0da64d3112069d9f78deeaba99b1d23470e756:dash-spv/src/sync/block_headers/manager.rs | nl -ba | sed -n '125,230p'
printf '%s\n' '--- truncate declarations and implementations ---'
rg -n -F -- 'truncate_above' dash-spv/src dash-spv
printf '%s\n' '--- run_locked and startup ---'
rg -n -F -- 'async fn run_locked' dash-spv/src/client/lifecycle.rs
git show 3c0da64d3112069d9f78deeaba99b1d23470e756:dash-spv/src/client/lifecycle.rs | nl -ba | sed -n '80,210p'Repository: dashpay/rust-dashcore
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printf '%s\n' '--- truncate declarations and implementations ---'
rg -n -F -- 'truncate_above' dash-spv/src dash-spv
printf '%s\n' '--- run_locked location ---'
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printf '%s\n' '--- lifecycle startup ---'
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Do not restart synchronization after a storage truncation fails.
handle_fork truncates block headers before filter headers, filters, and blocks. If a later truncation fails, the remaining operations are skipped, but the error branch still calls run_locked. After a successful header truncation, the stored tip is fork_height. BlockHeadersManager::fork_height does not classify a header whose parent is at that tip as a fork, so the same branch may not trigger cleanup again. Return the error and leave synchronization stopped, or resume the remaining truncations before restarting.
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only still-valid issues, skip the rest with a brief reason, keep changes
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Review comment at @dash-spv/src/client/lifecycle.rs around lines 288 - 289:
Update the truncation error branch in handle_fork to return or propagate the
error without calling run_locked, so synchronization remains stopped when a
truncation fails.
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| .await | ||
| .load_metadata::<ChainLock>(BEST_CHAINLOCK_METADATA_STORAGE_KEY) | ||
| .await?; | ||
| if let Some(chain_lock) = chain_lock.filter(|cl| fork_height < cl.block_height) { |
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🗄️ Data Integrity & Integration | 🟠 Major | 🏗️ Heavy lift
Reconcile the stored header with the ChainLock before rejecting the fork.
A valid ChainLock can be saved before its header exists: ChainLockManager::verify_block_hash permits that state. If a different branch is then stored through the ChainLock height, this height-only check rejects a fork toward the ChainLocked branch. The client can remain on the conflicting stored chain. Compare the stored header hash with chain_lock.block_hash. When they differ, recover toward the ChainLocked branch rather than rejecting every fork below its height. Add a test for that ordering.
🤖 Prompt for AI Agents
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Review comment at @dash-spv/src/sync/block_headers/manager.rs at line 213:
Update the fork check in the `chain_lock` handling to compare the stored header
hash with `chain_lock.block_hash`; when they differ, recover toward the
ChainLocked branch instead of rejecting every fork below
`chain_lock.block_height`. Add a test covering a ChainLock saved before its
header, followed by storage of a conflicting branch through the ChainLock
height.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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One more which probably comes in play whenever there is a fork since you said you restart the client?
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I think this doesnt apply:
I'd go further and drop the serde derives from the structs nobody serializes. That More broadly, I think key-wallet's current design is a source of problems we can't |
…bove # Conflicts: # dash-spv/src/sync/chainlock/manager.rs
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Breaking changes
key-walletWalletInfoInterface::truncate_above(height) -> Result<Truncation, Error>. It changes nothing and fails with the newError::TruncateBelowChainLockwhenheightis below the wallet's applied ChainLock.key-wallet-managerWalletInterface::truncate_above(height) -> Result<(), WalletError>, with no default implementation.WalletEvent::ChainTruncatedandWalletError::TruncateBelowChainLock.dash-spvMetadataStorage::load_metadata<T: DeserializeOwned>returns the deserialized JSON value instead of raw bytes.dash-spv-ffiFFIWalletEventCallbackshas a newon_chain_truncatedfield, so its layout changes and C/Swift callers must rebuild.Summary by CodeRabbit
PR Hygiene ·
2165277/self-revieweddash-spv-ffi/src/bin/ffi_cli.rs,dash-spv-ffi/src/callbacks.rs,dash-spv-ffi/tests/dashd_sync/callbacks.rsand 1 more) — approved by xdustinfacedash-spv(dash-spv/src/client/lifecycle.rs,dash-spv/src/storage/block_headers.rs,dash-spv/src/storage/blocks.rsand 11 more) — approved by xdustinfacekey-wallet-manager(key-wallet-manager/src/error.rs,key-wallet-manager/src/event_tests.rs,key-wallet-manager/src/events.rsand 3 more) — approved by xdustinfacekey-wallet(key-wallet/src/error.rs,key-wallet/src/managed_account/managed_core_funds_account.rs,key-wallet/src/tests/mod.rsand 6 more) — approved by xdustinfaceWhen every merge requirement is met, the
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