cfd-js-wasm

Crypto Finance Development Kit for WebAssembly (CFD-JS-WASM)

WebAssembly of cfd libraries (by JSON format API)

WebAssembly Example

example

Overview

This library is development kit for crypto finance application. Useful when developing applications for cryptocurrencies.

Target Network

Bitcoin
Liquid Network

Support function by cfd

Bitcoin
- Bitcoin Script (builder, viewer)
- Transaction
  - Create, Parse, Decode
  - Simple pubkey-hash sign / verify
  - Estimate Fee
  - Coin Selection (FundRawTransaction)
- PSBT (v0. v2 & taproot is not yet.)
  - Create, Parse, Decode
  - Simple pubkey-hash sign / verify
  - Estimate Fee
  - Coin Selection (FundRawTransaction)
- ECDSA Pubkey/Privkey (TweakAdd/Mul, Negate, Sign, Verify)
- BIP32, BIP39
- Output Descriptor (contains miniscript parser)
- Schnorr/Taproot
- Bitcoin Address (Segwit-v0, Segwit-v1, P2PKH/P2SH)
Liquid Network
- Confidential Transaction
  - Blind, Unblind
  - Reissuance
- Confidential Address

Libraries for each language

WebAssembly : cfd-js-wasm
- JavaScript : cfd-js
- C/C++ : cfd
  - Extend the cfd-core library. Defines the C language API and extension classes.
- C++ : cfd-core
  - Core library. Definition base class.
other language:
- Python : cfd-python
- C# : cfd-csharp
- Go : cfd-go
- Rust : cfd-rust

Use case

use web page development

Copy the wasm file in the dist folder. For access to wasm, copy’cfdjs_wasm_json.js’ or make your own. Copy cfdjs_wasm_jsonapi.js if necessary.

add dependencies on package.json (node.js or electron)

Add github’s cfd-js-wasm path on caller app’s package.json:

  "cfd-js-wasm": "github:p2pderivatives/cfd-js-wasm#semver:^0.3.2",

If you use old npm or yarn, describe as follows:

  "cfd-js-wasm": "git+https://github.com/p2pderivatives/cfd-js-wasm#semver:^0.3.2",

for Developper

Dependencies

Clang (10.0.0 or higher)
C/C++ Compiler
- can compile c++11
CMake (3.14.3 or higher)
Python (3.8 or higher)
node.js (12.8 or higher)
emscripten (1.39.10 or higher)

Build

Using docker

WebAssembly does not depend on the execution environment. You can use it in any environment by building it on Docker.

docker-compose build
docker-compose up

attention If you get an error, do the following:
1. remove external/libwally-core
2. remove node_modules

local build

First, set the environment variable of emscripten according to the usage procedure of emscripten.

When using the cmake-js package and npm script, the options for compilation are already set.

npm install
npm run emcmake

Test and Example

Test

npm run test

Example

web Example

Show github pages.

node.js Example

npm run example
npm run elements_example
npm run ts_example

Information for developpers

using library

cfd-js
- cfd
  - cfd-core
    - libwally-core (forked from ElementsProject/libwally-core)
    - univalue (for JSON encoding and decoding)

formatter

clang-format (using v10.0.0)
eslint

linter

cpplint
eslint

document tool

doxygen & graphviz

Developper Note

Git connection:

Git repository connections default to HTTPS. However, depending on the connection settings of GitHub, you may only be able to connect via SSH. As a countermeasure, forcibly establish SSH connection by setting CFD_CMAKE_GIT_SSH=1 in the environment variable.

Windows: (On the command line. Or set from the system setting screen.)
```
set CFD_CMAKE_GIT_SSH=1
```
MacOS & Linux(Ubuntu):
```
export CFD_CMAKE_GIT_SSH=1
```

Ignore git update for CMake External Project:

Depending on your git environment, you may get the following error when checking out external:

  Performing update step for 'libwally-core-download'
  Current branch cmake_build is up to date.
  No stash entries found.
  No stash entries found.
  No stash entries found.
  CMake Error at /workspace/cfd-core/build/external/libwally-core/download/libwally-core-download-prefix/tmp/libwally-core-download-gitupdate.cmake:133 (message):


    Failed to unstash changes in:
    '/workspace/cfd-core/external/libwally-core/'.

    You will have to resolve the conflicts manually

This phenomenon is due to the git update related command. Please set an environment variable that skips update processing.

Windows: (On the command line. Or set from the system setting screen.)
```
set CFD_CMAKE_GIT_SKIP_UPDATE=1
```
MacOS & Linux(Ubuntu):
```
export CFD_CMAKE_GIT_SKIP_UPDATE=1
```

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