feat(key-wallet): let a build fund from only the inputs it was given - #994
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ChangesRestricted input selection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The opt-in wallet funding mode enables chunked transactions without changing default behavior. Concurrent builds can still select the same input before reservation is recorded, so callers should serialize restricted builds or address atomic reservation before relying on concurrent construction. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant TransactionBuilder
participant FundingAccount
participant CoinSelection
TransactionBuilder->>FundingAccount: add_funding and reservation bookkeeping
FundingAccount-->>TransactionBuilder: funding candidates and change address
TransactionBuilder->>CoinSelection: filtered seeded inputs
CoinSelection-->>TransactionBuilder: selected transaction inputs
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## dev #994 +/- ##
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+ Coverage 77.06% 77.09% +0.02%
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Files 329 329
Lines 83317 83451 +134
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+ Hits 64209 64334 +125
- Misses 19108 19117 +9
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In `@key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs`:
- Around line 239-241: Update TransactionBuilder::use_only_added_inputs to make
restricted selection independent of call order: track inputs originating from
add_inputs and remove previously added funding candidates from self.inputs when
enabling the option, while preserving explicitly added inputs. Add a regression
test covering add_funding(...).use_only_added_inputs() and verifying restricted
selection does not retain the prior unreserved UTXOs.
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`add_funding` unions the funding account's entire unreserved UTXO set into the candidate pool, and `SelectionStrategy::All` then takes all of it. A caller that splits a large account into batches of at most MAX_STANDARD_TX_INPUTS and seeds one batch per build therefore achieves nothing: every build still sees the whole account and fails with TooManyInputs, so an account above the cap cannot be drained at all, however the caller chunks it. That is the iOS CoinJoin sweep. A wallet with 589 mixed UTXOs reports "Too many inputs for a standard transaction: 589 (max 500)" on every attempt and every retry, and the coins cannot be moved by any route the app offers. `use_only_added_inputs()` opts a build into funding from its seeded inputs alone. `add_funding` still records the reservation bookkeeping and supplies the change address, so whichever seeded outpoints selection picks are reserved by the account that holds them; it just contributes no candidates of its own. It also drops a seeded input the account has since reserved for another in-flight build. `add_inputs` does not consult the reservation set, while the normal funding path guarantees every candidate is unreserved — without this the opt-in would introduce a double-spend the default path cannot produce. Both directions are pinned by tests: a 589-UTXO account fails with TooManyInputs unbounded, and builds its 500-input chunk with the opt-in.
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…r builds in `use_only_added_inputs` only gated later `add_funding` calls, so a caller that funded first kept the account's whole unreserved set in the candidate pool and `SelectionStrategy::All` still tripped the cap — the very failure the option exists to prevent. `add_inputs` now records the outpoints it supplied, and enabling the option discards everything else already in the pool. Both orders now build the same transaction, which a regression test pins.
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Inline comments:
In `@key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs`:
- Line 224: Update the input insertion in the relevant transaction-builder
method to deduplicate self.inputs by OutPoint before appending a UTXO,
preserving the existing funding/input behavior while preventing duplicate
prevouts. Add a regression test covering
add_funding(...).add_inputs([utxo]).use_only_added_inputs() and verify the
resulting selection contains the UTXO only once.
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… offered Seeding an outpoint an earlier `add_funding` already contributed left two candidates for it, and the restriction kept both — coin selection does not deduplicate, so `SelectionStrategy::All` spent it twice and Core rejects the duplicate prevouts. The restriction now deduplicates as it filters. Scoped to the opt-in, like the reserved-input filter beside it: `add_inputs` can duplicate on the default path too, but deduplicating there changes behaviour for every current caller — and several existing tests seed the same outpoint repeatedly and rely on each copy counting, which is a fixture bug worth its own change rather than a silent one here.
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Inline comments:
In `@key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs`:
- Line 265: Ensure reserved seeded inputs remain excluded after later add_inputs
calls in the restricted-input flow: revalidate them against attached funding
reservations immediately before coin selection, or enforce the equivalent check
in add_inputs when use_only_added_inputs is active. Preserve valid seeded inputs
while preventing previously reserved outpoints from being spent, and add
regression coverage for both call orders around add_funding,
use_only_added_inputs, and add_inputs.
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The restriction ran wherever it was configured, so a later call could still slip a candidate past it: `add_inputs` after `use_only_added_inputs` could seed an outpoint another build had reserved, and nothing dropped it — `add_funding` had already excluded it, so it is not in that account's `owned` set and the build would not reserve it either, leaving coin selection free to spend it into a conflicting transaction. All three concerns now run once, immediately before coin selection, beside the `require_final_inputs` filter: keep only what `add_inputs` seeded, drop what a funding account has reserved, and collapse an outpoint offered twice. Call order stops mattering, and `add_funding` and `use_only_added_inputs` go back to being a plain accumulator and a plain setter. The tests now assert on the built transaction rather than the intermediate pool, which is where the contract actually lives, and cover both orderings.
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looks good but what if this were per funding call instead of a builder-wide flag add_funding_reservation_only(&mut funds, &acc), i.e. add_funding without contributing candidates? If they're never added there's nothing to undo later: the build-time filter and all the call-order handling go away.
Per review: `add_funding_reservation_only` takes on the account's reservation bookkeeping and change address without offering its UTXOs as candidates. Nothing is contributed, so nothing has to be undone — the builder-wide flag, the seeded- outpoint tracking and the order-independence handling all go away, and the option is now per funding account rather than per build. One check does not move to the call: `add_inputs` may run after it and does not consult a reservation set, so a seeded outpoint another in-flight build holds would still be selectable. That is revalidated before selection, against the reservation sets of the accounts funded this way — a double-spend the candidate path cannot produce, since every UTXO it offers is unreserved.
…pay/rust-dashcore into fix/sweep-only-added-inputs
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@ZocoLini took the per-call shape — thanks, it is simpler. One check did not move to the call, and I kept it before selection: Tests renamed to Note for whoever picks up the downstream PR: the shape change pushes the flag one layer up. dashpay/platform#4548 exposes this as a builder flag through the FFI, which no longer exists here, so it needs the flag held in 🤖 Generated with Claude Code |
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Nice — much more natural this way. One thing though: the new reservation_only_funding field isn't needed. self.funding already holds a ReservationSet per account, so the check can just derive from it
…g entries Per review: `funding` already carries a `ReservationSet` per account, so the separate `reservation_only_funding` field was duplicating what the builder knows. Deriving from `funding` also widens the guarantee, deliberately: the check now covers plain `add_funding` too. That path never offers a reserved UTXO of its own, but `add_inputs` can still seed one, and letting it through would spend an outpoint another in-flight build holds. No path into the builder can do that now, which a test pins.
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Right, the field was redundant — dropped, the check derives from That does widen it: it now covers plain 682 pass. 🤖 Generated with Claude Code |
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Two things look redundant now:
-
reservation_only_funding_is_independent_of_builder_call_orderis the same builder chain, fixture and assertion asreservation_only_funding_contributes_no_candidates -
The
reservedfilter infund_fromis now belt-and-braces: the build-time pass drops any reserved outpoint fromself.inputswhenever funding is attached, so a reserved candidate can't reach selection either way.
And the test comments still describe the flag design: they talk about "the opt-in", and the one on reservation_only_funding_cannot_duplicate_a_seeded_candidate says the pool would hold the outpoint twice — reservation-only funding contributes nothing, so it can't.
… the flag Per review: - `reservation_only_funding_is_independent_of_builder_call_order` was the same chain, fixture and assertion as `reservation_only_funding_contributes_no_candidates`. - `reservation_only_funding_cannot_duplicate_a_seeded_candidate` asserted something the shape now makes impossible: reservation-only funding contributes no candidates, so there is nothing for a seeded outpoint to duplicate against. - Comments still described the builder-wide flag as "the opt-in". The `reserved` filter in `fund_from` stays. It reads as belt-and-braces now that the pass before selection drops reserved outpoints, but it is also what keeps them out of the candidate pool in the first place, and `set_funding_skips_reserved_utxos` pins that at the pool level — removing the filter fails it.
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Both tests dropped, and the comments no longer talk about a flag that is gone. On the 680 pass. 🤖 Generated with Claude Code |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '--- PR metadata ---'
gh pr view 994 --repo dashpay/rust-dashcore --json number,title,headRefName,baseRefName,mergeable,state,url
echo '--- Changed files ---'
gh pr diff 994 --repo dashpay/rust-dashcore --name-only
echo '--- Current diff ---'
gh pr diff 994 --repo dashpay/rust-dashcore -- key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs
echo '--- File outline ---'
ast-grep outline key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs --items all --type impl,function --view expanded
echo '--- Reservation and input-selection references ---'
rg -n -C 5 --type rust \
'add_funding_reservation_only|add_funding|add_inputs|fund_from|assemble_unsigned|reserved|set_funding_skips_reserved_utxos|reservation_only_funding' \
key-wallet/src/wallet/managed_wallet_info/transaction_builder.rsLength of output: 1584 🏁 Script executed: #!/bin/bash
set -u
base_ref="$(git merge-base HEAD origin/dev 2>/dev/null || git merge-base HEAD dev 2>/dev/null || true)"
if [ -z "$base_ref" ]; then
echo 'Could not determine the merge base.'
exit 1
fi
echo '--- Diff against merge base ---'
git diff --no-ext-diff --unified=80 "$base_ref"...HEAD -- \
key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs
echo '--- File outline ---'
ast-grep outline key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs \
--items all --type impl,function --view expanded || true
echo '--- Funding and selection methods ---'
rg -n -C 14 --type rust \
'pub fn add_funding\b|pub fn add_funding_reservation_only\b|pub fn add_inputs\b|fn fund_from\b|fn assemble_unsigned\b' \
key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs || true
echo '--- Relevant test declarations ---'
rg -n -A 8 -B 3 --type rust \
'fn (set_funding_skips_reserved_utxos|reservation_only_funding_[A-Za-z0-9_]+)' \
key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs || trueLength of output: 42888 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '--- Post-selection reservation logic ---'
sed -n '560,760p' key-wallet/src/wallet/managed_wallet_info/transaction_builder.rs
echo '--- Reservation type and lifecycle definitions ---'
rg -n -C 12 --type rust \
'struct Reservation(Set|Token)\b|impl ReservationSet\b|fn reserve\b|fn release_if_owner\b|fn reserved\b' \
key-wallet/src
echo '--- New API call sites ---'
rg -n -C 6 --type rust \
'\.add_funding_reservation_only\s*\(' \
.
echo '--- Funding call sites ---'
rg -n -C 4 --type rust \
'\.add_funding\s*\(' \
key-walletLength of output: 41163
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…994) * feat(key-wallet): let a build fund from only the inputs it was given `add_funding` unions the funding account's entire unreserved UTXO set into the candidate pool, and `SelectionStrategy::All` then takes all of it. A caller that splits a large account into batches of at most MAX_STANDARD_TX_INPUTS and seeds one batch per build therefore achieves nothing: every build still sees the whole account and fails with TooManyInputs, so an account above the cap cannot be drained at all, however the caller chunks it. That is the iOS CoinJoin sweep. A wallet with 589 mixed UTXOs reports "Too many inputs for a standard transaction: 589 (max 500)" on every attempt and every retry, and the coins cannot be moved by any route the app offers. `use_only_added_inputs()` opts a build into funding from its seeded inputs alone. `add_funding` still records the reservation bookkeeping and supplies the change address, so whichever seeded outpoints selection picks are reserved by the account that holds them; it just contributes no candidates of its own. It also drops a seeded input the account has since reserved for another in-flight build. `add_inputs` does not consult the reservation set, while the normal funding path guarantees every candidate is unreserved — without this the opt-in would introduce a double-spend the default path cannot produce. Both directions are pinned by tests: a 589-UTXO account fails with TooManyInputs unbounded, and builds its 500-input chunk with the opt-in. * fix(key-wallet): apply the input restriction whatever order the caller builds in `use_only_added_inputs` only gated later `add_funding` calls, so a caller that funded first kept the account's whole unreserved set in the candidate pool and `SelectionStrategy::All` still tripped the cap — the very failure the option exists to prevent. `add_inputs` now records the outpoints it supplied, and enabling the option discards everything else already in the pool. Both orders now build the same transaction, which a regression test pins. * fix(key-wallet): collapse an outpoint both add_inputs and add_funding offered Seeding an outpoint an earlier `add_funding` already contributed left two candidates for it, and the restriction kept both — coin selection does not deduplicate, so `SelectionStrategy::All` spent it twice and Core rejects the duplicate prevouts. The restriction now deduplicates as it filters. Scoped to the opt-in, like the reserved-input filter beside it: `add_inputs` can duplicate on the default path too, but deduplicating there changes behaviour for every current caller — and several existing tests seed the same outpoint repeatedly and rely on each copy counting, which is a fixture bug worth its own change rather than a silent one here. * fix(key-wallet): apply the input restriction at selection time The restriction ran wherever it was configured, so a later call could still slip a candidate past it: `add_inputs` after `use_only_added_inputs` could seed an outpoint another build had reserved, and nothing dropped it — `add_funding` had already excluded it, so it is not in that account's `owned` set and the build would not reserve it either, leaving coin selection free to spend it into a conflicting transaction. All three concerns now run once, immediately before coin selection, beside the `require_final_inputs` filter: keep only what `add_inputs` seeded, drop what a funding account has reserved, and collapse an outpoint offered twice. Call order stops mattering, and `add_funding` and `use_only_added_inputs` go back to being a plain accumulator and a plain setter. The tests now assert on the built transaction rather than the intermediate pool, which is where the contract actually lives, and cover both orderings. * refactor(key-wallet): make it a funding call, not a builder-wide flag Per review: `add_funding_reservation_only` takes on the account's reservation bookkeeping and change address without offering its UTXOs as candidates. Nothing is contributed, so nothing has to be undone — the builder-wide flag, the seeded- outpoint tracking and the order-independence handling all go away, and the option is now per funding account rather than per build. One check does not move to the call: `add_inputs` may run after it and does not consult a reservation set, so a seeded outpoint another in-flight build holds would still be selectable. That is revalidated before selection, against the reservation sets of the accounts funded this way — a double-spend the candidate path cannot produce, since every UTXO it offers is unreserved. * refactor(key-wallet): derive the reserved-input check from the funding entries Per review: `funding` already carries a `ReservationSet` per account, so the separate `reservation_only_funding` field was duplicating what the builder knows. Deriving from `funding` also widens the guarantee, deliberately: the check now covers plain `add_funding` too. That path never offers a reserved UTXO of its own, but `add_inputs` can still seed one, and letting it through would spend an outpoint another in-flight build holds. No path into the builder can do that now, which a test pins. * test(key-wallet): drop the redundant cases and fix comments left from the flag Per review: - `reservation_only_funding_is_independent_of_builder_call_order` was the same chain, fixture and assertion as `reservation_only_funding_contributes_no_candidates`. - `reservation_only_funding_cannot_duplicate_a_seeded_candidate` asserted something the shape now makes impossible: reservation-only funding contributes no candidates, so there is nothing for a seeded outpoint to duplicate against. - Comments still described the builder-wide flag as "the opt-in". The `reserved` filter in `fund_from` stays. It reads as belt-and-braces now that the pass before selection drops reserved outpoints, but it is also what keeps them out of the candidate pool in the first place, and `set_funding_skips_reserved_utxos` pins that at the pool level — removing the filter fails it. --------- Co-authored-by: Roman <51091564+jeanpierreroma@users.noreply.github.com>
…was given The wallet-aware finalizers offer every unreserved UTXO of the funding account alongside anything `core_wallet_tx_builder_add_inputs_from_outpoints` seeded, so seeding a subset does not restrict what gets selected. A caller draining an account in batches that each stay under the standard-transaction input limit therefore achieves nothing: every batch sees the whole account and fails with a too-many-inputs error, and an account above the cap cannot be drained at all. That is the iOS CoinJoin sweep. Reproduced on a testnet wallet holding 700 mixed UTXOs: "Too many inputs for a standard transaction: 700 (max 500)" on every attempt; the reporting mainnet wallet has 589 and ~101 DASH it cannot move. key-wallet takes the choice per funding call (dashpay/rust-dashcore#994), and the finalizers make that call internally, so the intent is carried on the FFI builder and read when they run. `finalize_transaction` keeps its signature and delegates to `finalize_transaction_with_options`, so no existing caller changes.
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Problem
add_fundingunions the funding account's entire unreserved UTXO set into the candidate pool(
transaction_builder.rs:178-189), andSelectionStrategy::Allthen selects all of it(
coin_selection.rs, theAllarm). The input cap is checked after selection, against the selectedset:
So a caller that splits a large account into batches of at most 500 and seeds one batch per build via
add_inputsachieves nothing — every build sees the whole account. An account above the cap cannot bedrained at all, no matter how the caller chunks it, and no retry can help.
This is live: the iOS CoinJoin sweep (
SwiftDashSDKTransactionSender.sweepCoinJoin) does exactly thischunking. A user with 589 mixed UTXOs gets
Too many inputs for a standard transaction: 589 (max 500)on every attempt; their ~101 DASH cannot be moved by any route the app offers, and the failure is at
build time so nothing is broadcast.
What this changes
use_only_added_inputs()opts a build into funding from its seeded inputs alone.add_fundingkeepsdoing its reservation bookkeeping and still supplies the change address — so whichever seeded outpoints
selection picks are reserved by the account that owns them — it simply contributes no candidates.
Opt-in, so no existing caller changes behaviour.
It also drops a seeded input the account has since reserved for another in-flight build:
add_inputsdoes not consult the reservation set, whereas the normal funding path guarantees every candidate is
unreserved. Without that, the opt-in would introduce a double-spend the default path cannot produce.
Testing
cargo test -p key-wallet --lib— 681 passed, 0 failed, 18 ignored.Two new tests, both directions of the mechanism:
only_added_inputs_lets_a_chunked_drain_clear_the_input_cap— a 589-UTXO account (the figure fromthe live report) fails with
TooManyInputsunbounded, and builds its 500-input chunk with the opt-in.use_only_added_inputs_keeps_selection_to_the_seeded_batch—add_fundingcontributes no candidates,only the seeded input is spent, and it is still reserved by its owning account.
Notes for review
Related prior work that did not land: #819 (open) adds a
sweep_todrain plus in-key-wallet chunking,and dashpay/platform#3817 (closed) had the platform-side chunked sweep. This is the smaller, opt-in
piece that unblocks the existing app-side chunking; #819 remains the fuller answer if it is revived.
add_inputsbypassing the reservation filter also affects the default path, where a seeded outpoint canbe selected while reserved elsewhere. This PR only closes it under the new flag; the general case is
left alone deliberately, since changing
add_inputswould alter behaviour for every current caller.Summary by CodeRabbit
New Features
Bug Fixes