react-native-turbo-lnd

A pure C++-only TurboModule for lnd.

Easily embed and interact with the Lightning Network client lnd inside an app with a convenient API. This lib uses lnd's falafel bindings in order to run lnd embedded inside an app.

• ⚡️ Runs lnd embedded inside your app

• 🕺 Epic C++ TurboModule bindings for interacting with lnd, sharing the same source-code for all platforms

• 🤯 Convenient and simple API for all lnd gRPC methods and server/bidi streams

• 🤓 Type-safety and auto-complete for all protobufs, using protobuf-es

• 📦 Unopinionated core bindings for other protobuf libraries. Zero dependencies

• 👷‍♂️ Provide your own lnd binaries, or use our prebuilt ones

Platform support:

✅ Android
✅ iOS
✅ macOS
🤨 Linux via react-native-web and NodeJS C++ Addon (WIP)
🚫 Windows (planned)
🚫 Web
✅ Jest mocks (all gRPC methods not yet mocked)

An opinionated API react-native-turbo-lnd using protobuf-es bindings is provided for lnd's protobufs, giving auto-complete and type-safety for all protobufs and gRPC methods.

An unopinionated core API react-native-turbo-lnd/core to lnd's falafel bindings is also available if you want to use another protobuf library. This API let's you send and receive protobufs as base64-encoded strings, which you can then encode/decode yourself.

Note

We currently use an out-of-tree fork of lnd for building the binaries, which can be found here. This is because the official lnd repository does not yet support using falafel bindings with cgo. Once/if the official lnd repository supports building with cgo, we will switch to using the official lnd repository. This fork also has a few minor patches that is being used in Blixt Wallet.

Installation

This lib requires new architecture enabled in your app. It will not work on the old architecture and there are no plans to support it.

1. Install the package:

npm	yarn
npm install react-native-turbo-lnd	yarn add react-native-turbo-lnd

If you wish to use the protobuf-es bindings:

npm	yarn
npm install @bufbuild/protobuf	yarn add @bufbuild/protobuf

2. Download the lnd binaries automatically using a convenience script from the root of your project:

node node_modules/react-native-turbo-lnd/fetch-lnd.js

If you wish to download the binaries manually, follow the instructions below.

Android:

Download the latest lnd-cgo-android.zip from hsjoberg/react-native-turbo-lnd/releases containing lnd .so binaries and unzip the files to <project root>/android/app/src/main/jniLibs. The structure should look like this:

android/app/src/main/jniLibs
├── arm64-v8a
│   └── liblnd.so
├── armeabi-v7a
│   └── liblnd.so
├── x86
│   └── liblnd.so
└── x86_64
    └── liblnd.so

Note: CMake will by default look for the files in ../../../android/app/src/main/jniLibs, starting from <project root>/node_modules/react-native-turbo-lnd/cpp.

If you have another structure or wish to customize it, you can pass in -DLND_JNILIBS_PATH to CMake. For example from your app/build.gradle:

defaultConfig {
  // Other configs

  externalNativeBuild {
      cmake {
          arguments "-DLND_JNILIBS_PATH=/your/path/here"
      }
  }
}

iOS/macOS:

Download the latest liblnd-{ios|mac}.zip file from hsjoberg/react-native-turbo-lnd/releases and unzip it. Then rename liblnd-fat.a to liblnd.a and place it in <project root>/{ios|macos}/liblnd.a. Navigate to the folder in Finder and drag the liblnd.a file into the Xcode project root. Check "Copy items if needed". Be sure to also select the correct app target.

Note: You may need to also add libresolv to the Xcode project. Go to your app target in Xcode, then select the General tab. Find the "Frameworks, Libraries, and Embedded Content" section and click on the "+" button. Search for the libresolv.tbd file and add it.

3. Done!

Usage

import { Button, View } from "react-native";
import { start, getInfo } from "react-native-turbo-lnd";

export default function App() {
  const onPressStart = async () => {
    await start(
      `--lnddir="<TODO>" --noseedbackup --nolisten --bitcoin.active --bitcoin.mainnet --bitcoin.node=neutrino --feeurl="https://nodes.lightning.computer/fees/v1/btc-fee-estimates.json" --routing.assumechanvalid --tlsdisableautofill --neutrino.connect=192.168.10.120:19444`
    );
  }

  const onPressGetInfo = async () => {
    const info = await getInfo({});
    console.log("syncedToChain", info.syncedToChain);
  }

  return (
    <View>
      <Button title="start" onPress={onPressStart} />
      <Button title="getInfo" onPress={onPressGetInfo} />
    </View>
  )
}

Building your own lnd binaries

Note

If you wish to compile your own lnd binaries, you can follow the instructions here.

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT

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