feat(cashu): take flow escrow request + unblock creation — Track A TA-2 - #830
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. WalkthroughCashu Track A order and take actions now use no-Lightning handlers. Cashu takes atomically claim pending orders, persist trade keys, publish updates, and send escrow instructions without creating Lightning invoices. Concurrent or funded takes are rejected without overwriting escrow data. ChangesCashu Track A flow
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change enables the Cashu escrow request and take flow while preserving the existing Lightning path; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Client
participant CashuDispatch
participant TakeAction
participant EscrowHelper
participant Database
participant Seller
participant Buyer
Client->>CashuDispatch: submit Cashu order or take
CashuDispatch->>TakeAction: route Track A action
TakeAction->>EscrowHelper: request escrow with trade keys
EscrowHelper->>Database: atomically claim Pending as WaitingPayment
Database-->>EscrowHelper: claim result
EscrowHelper->>Database: persist and publish updated order
EscrowHelper->>Seller: send Cashu escrow instructions
EscrowHelper->>Buyer: send waiting notice
Suggested reviewers: Poem
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✅ Passed checks (4 passed)
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| order_updated | ||
| .update(pool) | ||
| .await |
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When two TakeBuy/TakeSell events for the same pending Cashu order run concurrently, both handlers can hold a stale Pending copy and reach this unconditional full-row update. If the first request has already let the seller submit AddCashuEscrow and the CAS has advanced the row to Active with cashu_* fields populated, the later stale update can rewrite the row back to WaitingPayment and clear the persisted escrow while notifications have already gone out. The take transition should be conditional on the current status/empty escrow before enqueueing the request, or re-read and abort once the order has moved on.
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Already addressed in 49e7e8c, before this comment was surfaced. show_cashu_escrow_request in src/util.rs now claims the transition with a CAS (claim_order_status, Pending -> WaitingPayment, refusing any order whose Cashu escrow is already funded) before it writes anything. The loser of a concurrent take gets CantDo(NotAllowedByStatus) and changes nothing, so the stale full-row update can no longer drag the status back or null a persisted cashu_escrow_token. Covered by the concurrent-rejection and funded-order-preservation tests in src/util.rs.
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Reviewed against current main. The design is sound and the CAS added in f76d5fe closes the concurrency hole properly — I checked the code claims individually. One thing should come out of the diff before merge, plus three notes.
Verified: 1049 passed / 0 failed, cargo clippy --all-targets -- -D warnings clean, cargo fmt --check clean. The helper actually has three tests, not the one the description lists — ..._advances_status_and_notifies_both_parties, ..._refuses_a_take_on_a_funded_order, and ..._refuses_a_second_concurrent_take. The latter two cover the CAS, which is the part that needed them. Worth updating the description; it undersells the coverage.
The early-return placement in take_sell.rs:222 / take_buy.rs sits after validation and before any Lightning-specific work, so "Lightning path byte-for-byte unchanged" holds structurally.
1. cashu-e2e-keys.json looks like an accidental commit
The diff adds a 6-line file at the repo root containing three cleartext secret values (buyer/seller/mostro trade keys), with a note reading "do not delete until the sats are swept." It isn't mentioned anywhere in the description's Changes list, and the note reads like a personal reminder rather than repo documentation — both of which point at a local harness artifact that got swept up.
Severity is genuinely low, and worth stating so nobody over-reacts: docker-compose.cashu.yml runs nutshell on the FakeWallet backend with MINT_PRIVATE_KEY=TEST_PRIVATE_KEY, and the file's own header says "no Lightning node, no real" sats. So these keys redeem worthless test ecash, not funds.
Still worth removing rather than leaving:
.gitignorehas no pattern that would catch it — it covers.env,settings.toml,mostro.db*, but a keys JSON at the root goes straight in. The next harness run commits it again.- Once it's in history on a public repo it stays there, and the same harness pointed at a real mint would produce an identically-shaped file.
- It cuts against where the repo is heading on key handling (AGENTS.md's scrubbing guidance, open issue #836).
Suggest dropping the file from the branch and adding something like cashu-e2e-keys.json (or *-keys.json) to .gitignore. If it's actually wanted as a fixture, tests/fixtures/ with a line saying the keys are FakeWallet-only would make the intent legible.
2. The CAS hardcodes Pending, but both callers accept two statuses
show_cashu_escrow_request claims Status::Pending → Status::WaitingPayment. Both call sites gate more loosely:
// take_sell.rs:80-81 (take_buy.rs:41-42 identical)
if order.check_status(Status::Pending).is_err()
&& order.check_status(Status::WaitingTakerBond).is_err()So an order in WaitingTakerBond passes the caller's check, reaches the helper, and gets refused by the CAS with NotAllowedByStatus — a legitimate take rejected.
It isn't reachable today, and the reason is worth writing down: validate_cashu_settings (src/config/util.rs:101-105) makes cashu.enabled and anti_abuse_bond.enabled mutually exclusive as a startup-fatal error, so WaitingTakerBond never occurs on a Cashu node. The correctness of the hardcoded Pending therefore rests on a constraint enforced in an unrelated module.
Given Tracks B/C/D will revisit this area, a one-line comment on the CAS call noting "Pending is the only reachable pre-state because cashu and anti_abuse_bond are mutually exclusive (§4.5, enforced in validate_cashu_settings)" would keep it from becoming a live bug if that decision is ever relaxed. Alternatively, accept both statuses in the claim.
3. Order of publish vs persist — I think it's safe, but not for the reason the comment gives
The helper publishes the WaitingPayment order event (update_order_event) before order_updated.update(pool) writes the full row. Between the CAS and that write there is a window where TA-1's lock CAS — which expects WaitingPayment — could fire, and the full-row write, built from the copy read before the CAS, would then null cashu_escrow_token / cashu_escrow_locked_at. That is precisely the clobbering the CAS doc comment sets out to prevent, arriving via the seller instead of a second taker.
I believe it's unreachable, for two reasons neither the comment nor the docs state: the seller cannot build the 2-of-3 without the buyer's trade pubkey, which only ships in the message enqueued after the write; and at that moment the DB row has no buyer_pubkey recorded yet, so the lock handler's own validation would reject the submission anyway.
Both of those are properties of code ordering elsewhere, not of this function. Worth a note here so a later refactor that moves either enqueue above the update doesn't quietly open the window.
4. Stale stack note, and the branch needs a rebase
The header says "Stacked on #829 (TA-1) → #828 (CF-5). Review/merge those first" — both merged (#828 on Jul 22, #829 on Jul 24) and the base is already main, so that line now sends a reviewer looking for dependencies that don't exist. The branch is 33 commits behind main; worth rebasing so CI reflects the real merge target.
Two things I'd call out as done well rather than as asks: claim_order_status binds Status::to_string() on both sides instead of hardcoding status literals — which is exactly the bug class #882 is currently fixing elsewhere in db.rs, so this one can't drift the same way. And the explanation on the CAS of why the loser's full-row write is dangerous (nulling columns its stale copy doesn't carry) is the kind of note that stops someone "simplifying" the guard away later.
Contributor, not a maintainer — technical review only, no merge signal implied.
Add the Cashu branch to `take_sell_action`/`take_buy_action` and the `show_cashu_escrow_request` helper (docs/cashu/02-track-a-lock.md §5), and unblock `NewOrder`/`TakeBuy`/`TakeSell` in `dispatch_cashu`. A taken order on a cashu node now asks the SELLER to lock a 2-of-3 escrow instead of paying a hold invoice, leaving the order in `WaitingPayment` where the TA-1 CAS expects it. Creatable and takeable ship together so the book never fills with untakeable orders (the orphan-order hazard CF-5 warns about). - `util::show_cashu_escrow_request`: advance to `WaitingPayment`, record both trade pubkeys, publish the order event, and enqueue an escrow request to the seller (`Action::WaitingSellerToPay` + `Payload::Order` carrying `amount`/`buyer_trade_pubkey`/`seller_trade_pubkey`) plus a bare "waiting for the seller" notice to the buyer. The buyer redeems ecash directly, so there is no buyer payout invoice. The escrow locks `order.amount` exactly (the fee is a separate token in TA-1f); the mint URL + locktime floor are node policy the daemon enforces authoritatively at lock validation (TA-1 §5/§7), so they are not carried in the request (the 0.14.0 protocol has no field for them). - `take_sell`/`take_buy`: early-return through `show_cashu_escrow_request` when `is_cashu_enabled()`, skipping the hold-invoice / buyer-invoice path. A supplied buyer invoice is ignored in Cashu mode. Lightning path unchanged. - `dispatch_cashu`: route `NewOrder`/`TakeBuy`/`TakeSell` to `handle_message_action_no_ln` (their real handlers); the gate test drops them from the `InvalidAction` list accordingly. Test: `show_cashu_escrow_request` advances the status, records both pubkeys, and enqueues the seller request (with the trade pubkeys + bare amount) and the buyer notice. Depends on CF-5 (+ TA-1 for the full e2e lock). Base: feat/cashu-ta1-lock-handler Refs: docs/cashu/02-track-a-lock.md (TA-2)
Addresses the P1 review finding on the TA-2 take flow. show_cashu_escrow_request built a full row from an order copy read at the top of the take handler and wrote it unconditionally. Two concurrent TakeBuy/TakeSell for the same pending order both pass the caller's in-memory check_status, so the loser's write lands second — dragging the status back to WaitingPayment with its own trade keys and nulling every column its stale copy does not carry. If the seller had already submitted AddCashuEscrow in the window, that includes the persisted cashu_escrow_token: a funded escrow silently erased, with the lock notifications already sent. The helper now claims the Pending -> WaitingPayment transition through db::claim_order_status before touching anything, so only one taker reaches the write and the loser aborts with CantDo(NotAllowedByStatus) having changed nothing. The claim additionally refuses any order whose escrow is already funded, so a late take can never drag a funded order backwards whatever its current status. Note the Lightning path has the same shape — show_hold_invoice writes a full row just as unconditionally — but its stale write clears an invoice hash/preimage that the invoice-subscription flow reconciles, not an escrow token that nothing can recover. Worth a separate issue; not changed here. Track A §5 is updated to match.
Addresses the review on #830. - Drop `cashu-e2e-keys.json`: a local TA-1 e2e harness artifact that got swept into the branch. The keys are FakeWallet-only (the compose mint runs with `MINT_PRIVATE_KEY=TEST_PRIVATE_KEY`), so nothing redeemable is exposed, but `.gitignore` had no pattern to catch it and the next harness run would commit it again. Adds `*-keys.json`. - Document why `show_cashu_escrow_request`'s CAS hardcodes `Pending` while both callers also admit `WaitingTakerBond`: `WaitingTakerBond` is unreachable on a Cashu node because `validate_cashu_settings` makes `cashu.enabled` and `anti_abuse_bond.enabled` mutually exclusive at startup. That constraint lives in an unrelated module, so relaxing it would turn the claim into a refused-legitimate-take bug. - Document why publishing the order event before the full-row `update` is safe: the seller cannot build the 2-of-3 without the buyer trade pubkey, which only ships after the write, and the row carries no `buyer_pubkey` for the lock handler to validate against yet. Both are properties of ordering elsewhere, so the note warns against hoisting either enqueue above the write.
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Inline comments:
In `@docs/cashu/02-track-a-lock.md`:
- Around line 578-586: Update the documentation reference to claim_order_status
so it uses the repository citation style: cite src/db.rs together with the
enclosing function name instead of db::claim_order_status. Leave the surrounding
explanation unchanged.
In `@src/app/take_sell.rs`:
- Around line 244-260: Update the take flow before the Cashu branch so buyer
payout invoice validation is skipped when Settings::is_cashu_enabled() is true,
while retaining validate_invoice for non-Cashu takes. Add a regression test
covering a malformed BOLT11 payload that succeeds through Cashu escrow handling.
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.gitignoredocs/cashu/02-track-a-lock.mdsrc/app.rssrc/app/take_buy.rssrc/app/take_sell.rssrc/db.rssrc/util.rs
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Cashu escrow mode never reads the buyer's payout invoice — the buyer redeems ecash directly from the 2-of-3 token — but `take_sell_action` ran `validate_invoice` before reaching the Cashu branch, so a stale or malformed BOLT11 payload rejected the take over a field the flow never uses. The inline comment already claimed a supplied invoice was ignored; now the code matches. The gate lives in `validate_buyer_invoice`, which takes the Cashu flag as an argument: `Settings::is_cashu_enabled()` reads the process-wide `MOSTRO_CONFIG` OnceLock, which a unit test cannot toggle, so the decision is only testable once it is separated from the read. Also fix a documentation citation to the repository style.
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Post-merge on TA-2. This is the same defect Nothing is burning: Cashu is off by default and I have it on a branch — the Cashu twin of that test (deterministic: claim, then assert |
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Correction to my comment above — the failure chain I described cannot occur.
What survives is narrower and already owned: between The branch may still be useful there: the test asserts |
2 participants
What & why
Completes the Cashu lock flow end-to-end with TA-1 (
docs/cashu/02-track-a-lock.md§5). A taken order on a cashu node now asks the seller to lock a 2-of-3 escrow instead of paying a hold invoice, and unblocks order creation + the take flow indispatch_cashu.Creation and taking ship together: unblocking
NewOrderany earlier would populate the book with orders that can never be taken to completion (no escrow) — the orphan-order hazard CF-5's rationale warns about.Changes
util::show_cashu_escrow_request(new, the Cashu analogue ofshow_hold_invoice): advance the order toWaitingPayment(where the TA-1 CAS expects it), record both trade pubkeys, publish the order event, and enqueue:Action::WaitingSellerToPay+Payload::Order(SmallOrder)carryingamount+buyer_trade_pubkey+seller_trade_pubkey(everything the client needs to build the 2-of-3);take_sell/take_buy: early-return throughshow_cashu_escrow_requestwhenis_cashu_enabled(), skipping the hold-invoice / buyer-invoice path. The buyer redeems ecash directly, so there is no buyer payout invoice (a supplied one is ignored). Lightning path byte-for-byte unchanged.dispatch_cashu:NewOrder/TakeBuy/TakeSell→handle_message_action_no_ln(their real handlers). The CF-5 gate test drops them from theInvalidActionlist.Design notes
order.amountexactly — the Mostro fee is a separate token (Option 2, TA-1f).add_cashu_escrow_action§5/§7), so a client funding against the wrong mint or too short a locktime is simply rejected and retries.Action::WaitingSellerToPay+Payload::Order(with the trade pubkeys set) — on a cashu node the seller's client reads that as "lock the escrow", the same convention the first-attempt branch used.Tests
Three tests cover the helper:
show_cashu_escrow_request_advances_status_and_notifies_both_parties— advances the status toWaitingPayment, records both trade pubkeys, and enqueues the seller escrow request (asserting theOrderpayload carries the trade pubkeys + bare amount, no buyer invoice) and the buyer notice.show_cashu_escrow_request_refuses_a_take_on_a_funded_order— the CAS refuses a take oncecashu_escrow_locked_atis set.show_cashu_escrow_request_refuses_a_second_concurrent_take— of two concurrent takes holding the same stalePendingcopy, only the winner proceeds; the loser aborts having changed nothing.Checklist
cargo fmt --checkcargo clippy --all-targets --all-features -- -D warningscargo test— 1227 passedBuilds on #829 (TA-1) and #828 (CF-5), both merged. Refs:
docs/cashu/02-track-a-lock.md(TA-2).🧪 Manual testing — step by step
Prereqs: the Cashu-mode
mostrodsetup from CF-5 (#828) — mint up (docker compose -f docker-compose.cashu.yml up -d),[cashu] enabled = true. Check out this branch (CF-5 + TA-1 are already onmain). Run withRUST_LOG=mostro=info.1. Order creation + taking are unblocked in Cashu mode
NewOrder).InvalidActionas in CF-5) and appears in the book asPending. ✔️TakeSell, orTakeBuyfor a buy order).2. The seller gets an escrow request; the order waits for the lock
Action::WaitingSellerToPaycarrying aPayload::Order(SmallOrder) whoseamount= the order amount and whosebuyer_trade_pubkey/seller_trade_pubkeyare set — everything the seller's client needs to build the 2-of-3. The buyer receives a bareWaitingSellerToPay"waiting for the seller" notice. ✔️status = 'waiting-payment', both trade pubkeys recorded. This is exactly where TA-1's lock CAS expects the order. ✔️3. Unit test
cargo test --bin mostrod show_cashu_escrow_requestExpected: the helper advances the order to
WaitingPayment, records both trade pubkeys, and enqueues the seller escrow request (Order payload with the trade pubkeys + bare amount) plus the buyer notice. ✔️4. Lightning regression
[cashu] enabled = false, create + take an order on an LND node.Summary by CodeRabbit
New Features
Bug Fixes
Documentation