austindoeswork / buildabot

Let's build a bot for npcompete.io

How to make your AI

+-------+
|NP     | <-- websocket --> your bot
|Compete| <-- websocket --> your enemy
|Server | --- websocket --> loyal fan
+-------+

list of language examples:

• golang
• c++
• python

0 Overview

• Get your devkey
• Open up a websocket to either of:
  • ws://localhost/wsjoin?game=NameOfGame
  • a specific room (that someone else can join)
  • ws://localhost/wsplay
  • play next available person
• Send devkey through the websocket
• Begin receiving game states
• Send game commands
• Win hella ca$h

1 Credentials

• Go to npcompete.io
• Signup with a username and password
• Get your devkey under your profile
• Do not share this key, as it will identify your bot
• nice

2 Websocket - Tutorial

This tutorial is in golang, but you can find other language examples within this directory

• We will be using the gorilla websocket package

$> go get github.com/gorilla/websocket

• Now lets make a file, and call it ai.go

package main

import (
	"fmt" // for io
	"github.com/gorilla/websocket" // for websockets
)

func main() {
	// some variables we need to connect
	serverURL := "ws://npcompete.io/wsplay"
	devkey := "YOURKEYHERE"
	
	//...
}

• Quickly open up a websocket

	//open websocket
	var dialer *websocket.Dialer
	conn, _, _ := dialer.Dial(serverURL, nil)
	defer conn.Close()
	
	//...

• Then, let's send our key thru the socket

	//write our devkey
	conn.WriteMessage(1, []byte(devkey))
	
	//...

• The server will respond with which player you are, your username, and the game name

	//receive acknowledgement
	_, msg, _ := conn.ReadMessage()
	fmt.Printf("%s\n", msg)
	
	//...

• Once the game starts, the server will being sending game states as json objects
• Now let's respond to each game frame with our super smart strategy

	//send game inputs
	for {
		_, msg, _ = conn.ReadMessage()
		_ = msg
		// fmt.Printf("%s\n", msg) 
		// uncomment this to output all frames
		
		conn.WriteMessage(1, []byte("b00 02"))
		//                           ^^  ^  
		//                      "buy"||  |
		//                            |  lane #
		//                code for a "nut" troop
	}

• TODO: watch your game at TODO
• We're done! Full Code HERE