Lambda function to get average VIZ price feed from bts.quotes.bank.viz.plus account https://eiy5lsown5.execute-api.us-east-2.amazonaws.com

feed.js

exports.handler = async function (event) {
  return new Promise(function (resolve, reject) {
    let viz = require("viz-js-lib");
    viz.config.set("websocket", "https://node.viz.cx/");
    viz.api.getAccounts(["bts.quotes.bank.viz.plus"], function (err, result) {
      if (err) {
        reject(Error(err));
      }
      let blockNum = result[0]["custom_sequence_block_num"];
      viz.api.getBlock(blockNum, function (err, res) {
        if (err) {
          reject(Error(err));
        }
        let transactions = res["transactions"];
        for (let t of transactions) {
          let operations = t["operations"];
          for (let o of operations) {
            if (o[0] === "custom") {
              if (o[1]["required_regular_auths"].includes("bts.quotes.bank.viz.plus")
                && o[1]["id"] === "vizplus_bitshares_info") {
                resolve(JSON.parse(o[1]["json"])[1]);
                return;
              }
            }
          }
        }
        reject(Error("Something went wrong"));
      });
    });
  });
};