epic_explorer/server/socket/block.ts

import { getConnection } from "typeorm";
const moment = require("moment");

export async function universalGetLatestBlockDetails(socket) {

  let block_height = "",
    letest_block = "",
    letest_block_num = "",
    letest_block_duration = "";

  const BlockchainLatestBlockQuery = await getConnection().query(
    "SELECT timestamp,height,edge_bits,hash,secondary_scaling, previous_id, total_difficulty_cuckaroo, total_difficulty_cuckatoo, total_difficulty_progpow, total_difficulty_randomx FROM blockchain_block ORDER BY timestamp DESC LIMIT 1"
  );
  const BlockchainPreviousBlockQuery = await getConnection().query(
    "SELECT total_difficulty_cuckaroo, total_difficulty_cuckatoo, total_difficulty_progpow, total_difficulty_randomx FROM blockchain_block WHERE hash=" +
      "'" +
      BlockchainLatestBlockQuery[0].previous_id +
      "'"
  );
  let height = BlockchainLatestBlockQuery[0].height;

  if (height > 12960) {
    var remain_block = height - 12960;
    var coin_existence =
      1440 * 200 +
      1440 * 180 +
      1440 * 160 +
      1440 * 140 +
      1440 * 120 +
      1440 * 100 +
      1440 * 80 +
      1440 * 60 +
      1440 * 50 +
      25 * remain_block;
  } else if (height > 11520) {
    var remain_block = height - 11520;
    var coin_existence =
      1440 * 200 +
      1440 * 180 +
      1440 * 160 +
      1440 * 140 +
      1440 * 120 +
      1440 * 100 +
      1440 * 80 +
      1440 * 60 +
      remain_block * 50;
  } else if (height > 10080) {
    var remain_block = height - 10080;
    var coin_existence =
      1440 * 200 +
      1440 * 180 +
      1440 * 160 +
      1440 * 140 +
      1440 * 120 +
      1440 * 100 +
      1440 * 80 +
      remain_block * 60;
  } else if (height > 8640) {
    var remain_block = height - 8640;
    var coin_existence =
      1440 * 200 +
      1440 * 180 +
      1440 * 160 +
      1440 * 140 +
      1440 * 120 +
      1440 * 100 +
      remain_block * 80;
  } else if (height > 7200) {
    var remain_block = height - 7200;
    var coin_existence =
      1440 * 200 +
      1440 * 180 +
      1440 * 160 +
      1440 * 140 +
      1440 * 120 +
      remain_block * 100;
  } else if (height > 5760) {
    var remain_block = height - 5760;
    var coin_existence =
      1440 * 200 + 1440 * 180 + 1440 * 160 + 1440 * 140 + remain_block * 120;
  } else if (height > 4320) {
    var remain_block = height - 4320;
    var coin_existence =
      1440 * 200 + 1440 * 180 + 1440 * 160 + remain_block * 140;
  } else if (height > 2880) {
    var remain_block = height - 2880;
    var coin_existence = 1440 * 200 + 1440 * 180 + remain_block * 160;
  } else if (height > 1440) {
    var remain_block = height - 1440;
    var coin_existence = 1440 * 200 + remain_block * 180;
  } else {
    var coin_existence = height * 200;
  }

  letest_block = moment(BlockchainLatestBlockQuery[0].timestamp).fromNow();
  letest_block_num = letest_block.substr(0, letest_block.indexOf(" ")); // "72"
  letest_block_duration = letest_block.substr(letest_block.indexOf(" ") + 1); // "tocirah sneab"
  const SECOND_POW_EDGE_BITS = 29;
  const BASE_EDGE_BITS = 24;

  if (BlockchainLatestBlockQuery[0].edge_bits == SECOND_POW_EDGE_BITS) {
    var hashvalue = BlockchainLatestBlockQuery[0].hash;
    var diff =
      (BlockchainLatestBlockQuery[0].secondary_scaling * 2 ** 64) /
      parseInt(hashvalue.substring(0, 16), 16);
    var result = Math.min(diff, 0xffffffffffffffff);
    var difficulty = Math.round(result);
  } else {
    var graph_weight =
      2 *
      2 ** (BlockchainLatestBlockQuery[0].edge_bits - BASE_EDGE_BITS) *
      BlockchainLatestBlockQuery[0].edge_bits;
    var hashvalue = BlockchainLatestBlockQuery[0].hash;
    var diff =
      (graph_weight * 2 ** 64) / parseInt(hashvalue.substring(0, 16), 16);
    var result = Math.min(diff, 0xffffffffffffffff);
    var difficulty = Math.round(result);
  }

  if (BlockchainLatestBlockQuery[0].previous_id) {
    var targetdifficultycuckaroo =
      BlockchainLatestBlockQuery[0].total_difficulty_cuckaroo -
      BlockchainPreviousBlockQuery[0].total_difficulty_cuckaroo;
    var targetdifficultycuckatoo =
      BlockchainLatestBlockQuery[0].total_difficulty_cuckatoo -
      BlockchainPreviousBlockQuery[0].total_difficulty_cuckatoo;
    var targetdifficultyprogpow =
      BlockchainLatestBlockQuery[0].total_difficulty_progpow -
      BlockchainPreviousBlockQuery[0].total_difficulty_progpow;
    var targetdifficultyrandomx =
      BlockchainLatestBlockQuery[0].total_difficulty_randomx -
      BlockchainPreviousBlockQuery[0].total_difficulty_randomx;
  }

  block_height = BlockchainLatestBlockQuery[0].height;
  var TotalCuckoo =
    parseInt(BlockchainLatestBlockQuery[0].total_difficulty_cuckatoo) +
    parseInt(BlockchainLatestBlockQuery[0].total_difficulty_cuckaroo);

  socket.emit("latestblockdetail", {
    block_height,
    letest_block,
    letest_block_num,
    letest_block_duration,
    coin_existence,
    difficulty,
    targetdifficultycuckaroo,
    targetdifficultycuckatoo,
    targetdifficultyprogpow,
    targetdifficultyrandomx,
    TotalCuckoo,
    TotalDifficultyCuckaroo:
      BlockchainLatestBlockQuery[0].total_difficulty_cuckaroo,
    TotalDifficultyCuckatoo:
      BlockchainLatestBlockQuery[0].total_difficulty_cuckatoo,
    TotalDifficultyProgpow:
      BlockchainLatestBlockQuery[0].total_difficulty_progpow,
    TotalDifficultyRandomx:
      BlockchainLatestBlockQuery[0].total_difficulty_randomx
  });
}