Module nonce 

Per-(account_index, api_key_index) sequential nonce manager.

Mirrors the optimistic strategy lighter-python’s OptimisticNonceManager uses: each call to NonceManager::next_nonce hands out the next monotonic integer for the requested key without waiting for the venue to confirm the prior one. The caller bounds the number of unconfirmed allocations through the NonceManager::skip_window argument; once the window is exhausted, NonceManager::next_nonce errors so the caller can drain or refresh before issuing further transactions.

The window bounds local unconfirmed allocations, not venue acceptance of out-of-order transactions. With skip_nonce=0, the venue requires consecutive nonces per API key; callers must preserve submission order.

The module is lock-free per key: a [DashMap] keys an Arc holding two AtomicI64s (last_issued and baseline). NonceManager::next_nonce is a CAS loop bounded by skip_window; NonceManager::ack_success monotonically advances the baseline when the venue confirms a tx; NonceManager::ack_failure_if_latest rolls back the most recent allocation when the failed nonce is still the latest issuance.

Structs

NonceManager

Thread-safe sequential nonce allocator keyed by (account_index, api_key_index).

Enums

NonceError

Errors raised by NonceManager.

Constants

DEFAULT_SKIP_WINDOW

Default skip-window used when the caller does not specify one.