FFI Implementations from the buttplug-rs Rust Sex Toy Control Library to other langauges.
If you don't work in Rust but still want to control sex toys, you're in the right place!
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Finished FFI implementations available in this repo:
Implementations currently in the works:
- Python
- C/C++
Implementations we'd like to see:
- Java/Kotlin
- Swift
- Idris
The Buttplug Rust FFI library exposes access to the Buttplug Client API of buttplug-rs. This allows creation of both in-process (i.e. run both a Buttplug client/server in the same process, including direct hardware access) and remote (i.e. use Buttplug Client to talk via Websockets/Pipes/etc to a remote Buttplug server) Buttplug Clients. From these clients, you can scan for and get back device objects, which allow for control of devices from the language of your choice.
The usable API surface of Buttplug is fairly small. The bulk of the library consists of internal configuration, protocol translation, and hardware communication. If the FFI layer seems small, that's because it is. There really aren't that many entry points into the library itself, which luckily makes building FFI easy.
For simple type conversion purposes, the FFI layer uses protobufs. Protobufs provide a simple, fast way to deal with type differences between many languages, and due to the low frequency of message updates in buttplug (we might send 100s of messages per second in a system with multiple devices, but usually its 10s), the overhead of the conversion process isn't too expensive for us. Flatbuffers were originally considered and implemented for C#, but ended up causing developer friction on bringup. We don't really need the ability to pick out fields to parse, as we'll always be using the full message in arguments.
For more information on FFI and Rust using intermediate serialization layers, check out the following articles:
- Rust @ Fullstory Part 2
- Rust @ Fullstory Part 2
- Crossing the Rust FFI Frontier with Protocol Buffers
The actual FFI layer consists of a few exposed cdecl functions (see the export.rs file for method definitions) that serve as message passing interfaces in and out of the system. These functions should handle being called from different threads.
The library currently implements FFI from Rust to the following languages:
- C#
- JS/Typescript for web via WASM and Typescript
Our current plans are to expand to the following list of languages:
- JS/Typescript for Node
- Python
- C/C++
- Swift
- Java
- Go
- Haskell
If you have any languages you would like to see supported, please file an issue and let us know.
If you have questions, support is available via:
- Discord - This is the best choice for support
- Mentions/DMs to @buttplugio on twitter
If you would like to help provide language implementations for buttplug-rs-ffi, please create an issue or comment on a related issue in our tracker.
Please discuss any interest in providing implementations in an issue (or privately with qdot on discord or twitter DMs if you would like to stay anonymous and out of recorded info on the repo) before submitting PRs. Random PRs without matching issues and discussion are likely to be closed without merging.
buttplug-rs-ffi is BSD licensed.
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