node-red-native-addon

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node-red-native-addon

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Node-RED Native (WebAssembly) Addon (for my own reference)

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# Node-RED Native (WebAssembly) Addon

## What is WebAssembly?

> WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable target for compilation of high-level languages like C/C++/Rust, enabling deployment on the web for client and server applications.    _from [WebAssembly.org](https://webassembly.org/)_

> WebAssembly has huge implications for the web platform — it provides a way to run code written in multiple languages on the web at near native speed, with client apps running on the web that previously couldn’t have done so. _from [Mozila.org](https://developer.mozilla.org/en-US/docs/WebAssembly)_

## WebAssembly in node

- [Getting Started With WebAssembly in Node.js](http://thecodebarbarian.com/getting-started-with-webassembly-in-node.js.html)
- [Run wast (WebAssembly) in node](https://gist.github.com/kanaka/3c9caf38bc4da2ecec38f41ba24b77df)

## WebAssembly + Node-RED (node v8+)

Since WebAssembly is available in node (v8.x+), I experimented in Node-RED environment

#### Example 1. `node-red-contrib-nativesquare` :   calling `_square()` from `square.wasm`.

square.wasm was pre-built wasm (originally in C).

```
Welcome to Node-RED
===================
9 Aug 13:31:36 - [info] Node-RED version: v0.18.6
9 Aug 13:31:36 - [info] Node.js  version: v8.11.2
9 Aug 13:31:36 - [info] Windows_NT 10.0.10586 x64 LE
```

- [native-square-flow.json](https://github.com/phyunsj/node-red-native-addon/blob/master/node-red-native-addon-example.json)

#### Example 2. `node-red-contrib-nativesquare` :   calling `_lowercase(char *)` from `lowercase.wasm`.

- [Passing a string to C code compiled with emscripten.](https://github.com/phyunsj/node-red-native-addon/tree/master/node-red-contrib-lowercase)

- [native-lowercase-flow.json](https://github.com/phyunsj/node-red-native-addon/blob/master/node-red-contrib-lowercase.json)

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