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cdd59359b9
* pubsub: consolidate into Spec, adopt Arc<SubscriptionId>, and wire through wallet/mint/WS/FFI
Refactor the pub/sub engine to a single Spec trait, move Event alongside it,
and propagate Arc-backed subscription IDs across the stack. This simplifies
generics, clarifies responsibilities, and preserves coalescing +
latest-on-subscribe semantics.
- **Single source of truth:** `Spec` owns `Topic`, `Event`, `SubscriptionId`,
`Context`, new_instance, and fetch_events.
- **Lean & explicit API:** Remove Topic trait split;
`Subscriber::send(Event)` carries sub-ID internally.
- **Performance/ergonomics:** `Arc<SubscriptionId>` avoids heavy clones and
makes channel/task hops trivial.
- Introduce `pub_sub/typ.rs` with:
- trait `Spec`
- trait `Event` colocated with Spec.
- Remove `pub_sub/event.rs` fold `Event` into `typ.rs`.
- Make `Pubsub<S>` generic over `Spec` and store `Arc<S>`.
- The subscriber holds `Arc<SubscriptionId>` and deduplicates the latest
entry per subscription.
- SubscriptionRequest: rename SubscriptionName → SubscriptionId; return
`Arc<...>` from `subscription_name()`.
- Remote consumer (Transport) now parameterized by `Spec`; control types
updated:
- `StreamCtrl<S>`, `SubscribeMessage<S>`, internal caches keyed by
`S::Topic`.
- Mint/wallet:
- Mint: `MintPubSubSpec` (Context = `DynMintDatabase`),
`PubSubManager(Pubsub<MintPubSubSpec>)`.
- Wallet: lightweight MintSubTopics Spec with `Context = ()`.
- IDs go Arc end-to-end:
- cdk-axum WS maps `HashMap<Arc<SubId>, JoinHandle<()>>`, publisher sends
`(Arc<SubId>, NotificationPayload)`.
- `subscription::{Params, WalletParams}` now use `Arc<...>`.
- cdk-ffi conversions & wallet glue updated.
- Integration tests updated for new types.
- Coalescing unchanged: multiple local subs to the same topic are combined
into a single remote sub.
- Backfill via `Spec::fetch_events(topics, Subscriber)`; Subscriber enforces
latest-only dedupe per subscription.
**Result:** a slimmer, more maintainable pub/sub core that’s easier to embed
across mint, wallet, transports, and FFI without sacrificing performance or
semantics.
---------
Co-authored-by: thesimplekid <tsk@thesimplekid.com>
Cashu
A Rust implementation of the Cashu protocol, providing the core functionality for Cashu e-cash operations.
Overview
This crate implements the core Cashu protocol as defined in the Cashu NUTs (Notation, Usage, and Terminology).
Features
- Cryptographic Operations: Secure blind signatures and verification
- Token Management: Creation, validation, and manipulation of Cashu tokens
- NUTs Implementation: Support for the core Cashu protocol specifications
- Type-safe API: Strongly-typed interfaces for working with Cashu primitives
Usage
Add this to your Cargo.toml:
[dependencies]
cashu = "*"
Basic Example
use cashu::amount::Amount;
use cashu::nuts::nut00::Token;
use std::str::FromStr;
// Parse a Cashu token from a string
let token_str = "cashuBo2FteCJodHRwczovL25vZmVlcy50ZXN0bnV0LmNhc2h1LnNwYWNlYXVjc2F0YXSBomFpSAC0zSfYhhpEYXCCpGFhAmFzeEAzYzNlOWRhMDU3ZjQzNmExOTc2MmRhOWYyYTBjMzc5YzE5N2RlNDMzZDY5MWU1NDI0ZmRjODcxNjZjMmNlMjZmYWNYIQKKtwESLR-yn5rqNAL3_8_H5BtpwjSPs7uOJ18kPn2mV2Fko2FlWCCsMAK1xoLlwVRxpv8hfsxKYXlXTOomiVt3JCbzNgQpUmFzWCD9MfRUr0asiF_jUJMSylphLvKUd2SLz9oSpcvuLCXPp2FyWCA_1toQ_l158xW0zorqTBXvh76o-_D3e-Ru1Ea-51UrFaRhYQhhc3hAMTM5YWRjZDJlY2Q5MWQyNjNjMDhhMzdhNjBmODZjNDVkYWE3NjNmNjM4NTY0NzEyMmFiZjhlMDM3OGQ0NjA5OGFjWCECHZh5Qx9o-8PaY6t0d5hRTbWeez1dh3md7ehfE25f2N5hZKNhZVgg5MLkVzIw2tDzdUpYwFe-MLhIPJ4hkCpPGL0X7RxpPIRhc1ggyEtcsq3FX8wZOGpwTXOP7BsqfdYdMhGG1X8jVjncDcVhclggyLVOc2xy4m1_YeYGef2HQ8WyJX7LjZq403CS9Dt_eME=";
let token = Token::from_str(token_str).expect("Valid token");
// Get the total amount
let amount: Amount = token.value().expect("Value");
println!("Token amount: {}", amount);
Implemented NUTs
Mandatory
| NUT # | Description |
|---|---|
| 00 | Cryptography and Models |
| 01 | Mint public keys |
| 02 | Keysets and fees |
| 03 | Swapping tokens |
| 04 | Minting tokens |
| 05 | Melting tokens |
| 06 | Mint info |
Optional
| # | Description | Status |
|---|---|---|
| 07 | Token state check | Implemented |
| 08 | Overpaid Lightning fees | Implemented |
| 09 | Signature restore | Implemented |
| 10 | Spending conditions | Implemented |
| 11 | Pay-To-Pubkey (P2PK) | Implemented |
| 12 | DLEQ proofs | Implemented |
| 13 | Deterministic secrets | Implemented |
| 14 | Hashed Timelock Contracts (HTLCs) | Implemented |
| 15 | Partial multi-path payments (MPP) | Implemented |
| 16 | Animated QR codes | Not implemented |
| 17 | WebSocket subscriptions | Implemented |
| 18 | Payment Requests | Implemented |
| 19 | Cached responses | Implemented |
| 20 | Signature on Mint Quote | Implemented |
License
This project is licensed under the MIT License.