see_leaderboard_bot/advancementAPI.ts

import {Rcon, PacketType} from "./rcon";

import config from "./config.json" assert { type: "json" };

const advancements = new Map<string, number>();
let advancementsRequired = 0;
let authenicated = false;

const advancementRegex = /^([^ ]*) has (\d*) \[Advancements\]$/gm;
const playerRegex = /There are \d* whitelisted player\(s\): /gm;
const noAdvancements =
  /^Can't get value of bac_advancements for ([^;]*); none is set$/gm;

const client = new Rcon(
  config.rcon.host,
  config.rcon.port,
  config.rcon.password
);
let rconReconnectTimeout: Timer | null | undefined;

client.on("connect", () => {
  console.log("RCON connected.");
});

client.on("auth", () => {
  console.log("RCON authenicated.");
  authenicated = true;
});
client.on("end", () => {
  console.log("RCON ended. Reconnecting in 1000ms.")
  if(rconReconnectTimeout) {
    clearTimeout(rconReconnectTimeout);
  }
  rconReconnectTimeout = setTimeout(() => {
    client.connect()
  }, 1000)
})
client.on("response", (a: string) => {
  if (playerRegex.test(a)) {
    const whitelistedPlayers = a.replace(playerRegex, "").split(", ");
    advancementsRequired = whitelistedPlayers.length;

    for (let i = 0; i < whitelistedPlayers.length; i++) {
      setTimeout(() => {
        const name = whitelistedPlayers[i];
        client.send(`scoreboard players get ${name} bac_advancements`, PacketType.COMMAND);
      }, i * 20);
    }
  }

  if (advancementRegex.test(a)) {
    advancements.set(
      a.replace(advancementRegex, "$1"),
      +a.replace(advancementRegex, "$2")
    );
  }
  if (noAdvancements.test(a)) {
    advancements.set(a.replace(noAdvancements, "$1"), 0);
  }
  if (advancements.size == advancementsRequired) {
    client.emit("done");
  }
});

export function getAdvancements(): Promise<Map<string, number>> {
  return new Promise(async (res, rej) => {
    if (!authenicated) {
      await new Promise((res2, rej2) => {
        client.once("auth", () => {
          res2("");
        });
        client.once("error", () => {
          rej2();
        });
      });
    }
    advancementsRequired = 0;
    advancements.clear();
    client.send("whitelist list", PacketType.COMMAND);
    client.once("done", () => {
      res(advancements);
    });
  });
}

client.connect();