Creating a script to random move a set of bots

[FDelporte]

Hi, this is my first experiment with Mineflayer for a demo/test project. I would like to have several bots walking around, and recreate them whenever they die, lose connection, etc...

Based on farmers and some of the other examples, I created this code, but still, my bots keep disconnecting and don't get recreated. I think I missed some of the related events...

I'm using Minecraft Server 1.19.2

From time to time, also errors are thrown, like this:

Error: write EPIPE
    at afterWriteDispatched (node:internal/stream_base_commons:160:15)
    at writeGeneric (node:internal/stream_base_commons:151:3)
    at Socket._writeGeneric (node:net:900:11)
    at Socket._write (node:net:912:8)
    at writeOrBuffer (node:internal/streams/writable:392:12)
    at _write (node:internal/streams/writable:333:10)
    at Writable.write (node:internal/streams/writable:337:10)
    at Framer.ondata (/minecraft-client-simulator/node_modules/readable-stream/lib/internal/streams/readable.js:699:22)
    at Framer.emit (node:events:513:28)
    at addChunk (/minecraft-client-simulator/node_modules/readable-stream/lib/internal/streams/readable.js:291:12) {
  errno: -32,
  code: 'EPIPE',
  syscall: 'write'
}

/node_modules/mineflayer/lib/promise_utils.js:62
    const timeoutError = new Error(`Event ${event} did not fire within timeout of ${timeout}ms`)
                         ^
Error: Event blockUpdate:(71, 91, -28) did not fire within timeout of 5000ms
    at onceWithCleanup (/minecraft-client-simulator/node_modules/mineflayer/lib/promise_utils.js:62:26)
    at placeBlockWithOptions /minecraft-client-simulator/node_modules/mineflayer/lib/plugins/place_block.js:13:36)
    at runNextTicks (node:internal/process/task_queues:60:5)
    at listOnTimeout (node:internal/timers:533:9)
    at process.processTimers (node:internal/timers:507:7)
    at async EventEmitter.placeBlock (/minecraft-client-simulator/node_modules/mineflayer/lib/plugins/place_block.js:24:5)

Someone who has an existing sample or can improve mine?

const { Vec3 } = require('vec3')
const mineflayer = require('mineflayer')
const { pathfinder, Movements, goals } = require('mineflayer-pathfinder')

const names = []
const bots = []

if (process.argv.length < 4 || process.argv.length > 6) {
  console.log('Usage : node farmer.js <host> <port>')
  process.exit(1)
}

let i = 0
function next () {
  if (i < 5) {
    setTimeout(() => {
      createBot(`farmer-bot-${i}`)
      next()
    }, 100)
    i++
  }
}
next()

function createBot (name) {
    console.log("Creating " + name)

    const bot = mineflayer.createBot({
        host: process.argv[2],
        port: parseInt(process.argv[3]),
        username: name
    })

    bot.loadPlugin(pathfinder)

    let counter = 1;
    
    bot.once('spawn', function () {
        bot.pathfinder.setMovements(new Movements(bot))

        var idx = bots.length
        bots[idx] = bot
        names[idx] = name
        
        console.log("Added " + idx + " " + bots[idx] + " " + names[idx])
        
        setInterval(() => {
            const entity = bot.nearestEntity()
            if (entity !== null) {
                if (entity.type === 'player') {
                    bot.lookAt(entity.position.offset(0, 1.6, 0))
                    counter++
                    if (counter > 50) {
                        counter = 1
                        moveBotsRandom()
                    }
                } else if (entity.type === 'mob') {
                    console.log("Entity is a mob")
                    bot.lookAt(entity.position)
                }
            }
        }, 50)
    })

    function blockToSow () {
        return bot.findBlock({
            point: bot.entity.position,
            matching: bot.registry.blocksByName.farmland.id,
            maxDistance: 6,
            useExtraInfo: (block) => {
                const blockAbove = bot.blockAt(block.position.offset(0, 1, 0))
                return !blockAbove || blockAbove.type === 0
            }
        })
    }

    function blockToHarvest () {
        return bot.findBlock({
            point: bot.entity.position,
            maxDistance: 6,
            matching: (block) => {
                return block && block.type === bot.registry.blocksByName.wheat.id && block.metadata === 7
            }
        })
    }

    async function loop () {
        try {
            while (1) {
                const toHarvest = blockToHarvest()
                if (toHarvest) {
                    await bot.dig(toHarvest)
                } else {
                    break
                }
            }
            while (1) {
            const toSow = blockToSow()
                if (toSow) {
                    await bot.equip(bot.registry.itemsByName.wheat_seeds.id, 'hand')
                    await bot.placeBlock(toSow, new Vec3(0, 1, 0))
                } else {
                    break
                }
            }
        } catch (e) {
            console.log(e)
        }

        // No block to harvest or sow. Postpone next loop a bit
        setTimeout(loop, 1000)
    }

    bot.once('login', loop)
    bot.on('error', (err) => {
        console.log("Err " + name)
        createBot(name)
    })

    // Reconnect
    bot.on('death', () => {
        console.log("Died " + name)
        createBot(name)
    })
}

function moveBotsRandom() {
    for (let i = 0; i < bots.length; i++) {
        let bot = bots[i]
        let randomX = randomNumber(1, 100)
        let randomY = randomNumber(1, 100)
        let randomZ = randomNumber(1, 10)
        console.log("Moving " + names[i] + " to " + randomX + "/" + randomY + "/" + randomZ)
        bot.pathfinder.setGoal(new goals.GoalBlock(randomX, randomY, randomZ))
    }
}

function randomNumber(min, max) { 
    return Math.random() * (max - min) + min;
}   

[amoraschi]

1.19.2 is not supported yet.