`slp-realtime`

The brains and the brawn of Project Clippi.

This library provides an easy way to subscribe to real-time Slippi game events as they happen. Rebuilt from the ground up using RxJS Observables, the power to subscribe to any and every event is in your hands.

Highlights

Go file-less. Read directly from Slippi Dolphin, the relay, or a console.
Custom combos. Easily add combo parameters and output Dolphin-compatible JSON files.
Powerful RxJS Observable and Stream API.

Installation

This package relies on the rxjs and @slippi/slippi-js packages as a peer dependency and must be installed alongside this package.

With NPM

npm install @vinceau/slp-realtime rxjs @slippi/slippi-js

With Yarn

yarn add @vinceau/slp-realtime rxjs @slippi/slippi-js

Usage

See a working example or check out the docs.

For a list of all the subscribable events, click here.

Subscribing to In-Game Events

We can use this library to subscribe to in game events.

First instantiate an instance of SlpLiveStream and connect to a Wii or Slippi relay.

const { SlpLiveStream } = require("@vinceau/slp-realtime");

const livestream = new SlpLiveStream();
livestream
  .start(address, slpPort)
  .then(() => {
    console.log("Successfully connected!");
  })
  .catch(console.error);

Then instantiate an instance of SlpRealTime and pass the SlpLiveStream to it. We will use it to subscribe to desired events. For example:

const { SlpRealTime } = require("@vinceau/slp-realtime");

const realtime = new SlpRealTime();
// Read from the SlpLiveStream object from before
realtime.setStream(livestream);

realtime.game.start$.subscribe(() => {
  console.log("game started");
});

realtime.stock.playerSpawn$.subscribe((stock) => {
  const { playerIndex, count } = stock;
  console.log(`player ${playerIndex + 1} spawned with ${count} stocks remaining`);
});

realtime.combo.end$.subscribe(() => {
  console.log("wombo combooo!!");
});

Detecting Custom Combos

We can subscribe to the end of any and every combo but really what we want is to filter for specific combos.

First, instantiate a ComboFilter. For all the possible filtering options, see ComboFilterSettings.

const { ComboFilter } = require("@vinceau/slp-realtime");

const comboFilter = new ComboFilter();
comboFilter.updateSettings({
  excludeCPUs: false, // combos on CPUs are okay
  comboMustKill: false, // combos don't have to kill
  minComboPercent: 40, // combos have to do at least 40% damage
});

ComboFilter has an isCombo() method which returns true if a given combo matches the specified criteria. We can hook it up to our live stream with the following:

realtime.combo.end$.subscribe((payload) => {
  const { combo, settings } = payload;
  if (comboFilter.isCombo(combo, settings)) {
    console.log("Combo matched!");
  }
});

Make a Custom HUD

Want to make your own HUD?

Subscribe to percent and stock changes
Write the data to a file
Add files to OBS
???
Profit!!

realtime.stock.percentChange$.subscribe((payload) => {
  const player = payload.playerIndex + 1;
  console.log(`player ${player} percent: ${payload.percent}`);
  fs.writeFileSync(`./player${player}Percent.txt`, payload.percent.toFixed(0));
});

realtime.stock.countChange$.subscribe((payload) => {
  const player = payload.playerIndex + 1;
  console.log(`player ${player} stocks: ${payload.stocksRemaining}`);
  fs.writeFileSync(`./player${player}Stocks.txt`, payload.stocksRemaining.toString());
});

NOTE: Please don't actually do this for real custom HUDs. Writing to files is slow and OBS takes a long time to update after file changes. If you actually want to build a custom layout for OBS you should use a browser source and send updates using websockets instead of writing data to a file.

Setup on WSL

If you're running the Node project inside Windows Subsystem for Linux and running Dolphin or a relay in Windows, setup requires a couple extra steps:

Change the address passed to livestream.start to the one listed in /etc/resolv.conf instead of localhost (see here)
Add a firewall rule allowing access from WSL (see here)

Development

To build the library from source:

yarn run build

To start the development server:

yarn run watch

To run the tests:

yarn run test

Acknowledgements

This project was made possible by:

Jas Laferriere and the rest of the Project Slippi team
NikhilNarayana and his Get Slippi Combos script

License

This software is released under the terms of MIT license.

Linking back to this Github repo is much appreciated.