ppai/server/triangle/trangleCalc.js

import crypto from 'crypto';
import iorKeys from './iorKeys.js';
import eventSolutions from './eventSolutions.js';

/**
 * 精确浮点数字
 * @param {number} number
 * @param {number} x
 * @returns {number}
 */
const fixFloat = (number, x=3) => {
  return parseFloat(number.toFixed(x));
}

/**
 * 盘口排序
 */
const priority = { polymarket: 1, pinnacle: 2 };
const getPriority = (p) => {
  return priority[p] ?? 99;
}
const sortCpr = (cpr) => {
  const temp = [...cpr];
  temp.sort((a, b) => getPriority(a.p) - getPriority(b.p));
  return temp;
}

/**
 * 获取平台类型
 */
const getPlatformKey = (cpr) => {
  const platforms = sortCpr(cpr).map(item => item.p);
  return [...new Set(platforms)].join('_');
}

const cartesianOdds = (selection) => {
  const [a, b, c] = selection;
  return a.flatMap(itemA => b.flatMap(itemB => c.map(itemC => [itemA, itemB, itemC])));
}

const getOptimalSelections = (odds, rules) => {
  const results = [];

  rules.forEach((rule, ruleIndex) => {
    const validOptions = [];
    const selection = [];
    let isValid = true;
    for (let i = 0; i < 3; i++) {
      const key = rule[i];
      let item = odds[key];
      if (key === '-') {
        item = { no: { v: 1 } };
      }
      if (!item) {
        isValid = false;
        break;
      }
      const candidates = Object.keys(item);
      if (candidates.length === 0) {
        isValid = false;
        break;
      }
      selection.push(candidates.map(k => ({
        k: key,
        p: k,
        o: item,
        ...item[k],
      })));
    }
    if (isValid) {
      const cartesian = cartesianOdds(selection);
      cartesian.forEach(iors => {
        const iorsCount = new Set(iors.filter(ior => ior.p !== 'no').map(ior => ior.p));
        if (iorsCount.size > 1) {
          validOptions.push(iors);
        }
      });
    }
    validOptions.forEach(iors => {
      results.push({ rule, iors, ruleIndex });
    });
  });
  return results;
}

export const getPassableEvents = (relations) => {
  return relations.map(({ platforms }) => {
    const eventsMap = {};
    const oddsMap = {};

    Object.keys(platforms).forEach(platform => {
      const { id, leagueName, teamHomeName, teamAwayName, timestamp, evtime, odds } = platforms[platform] ?? {};
      if (!odds) {
        return;
      }
      if (platform === 'polymarket') {
        eventsMap['info'] = { id, leagueName, teamHomeName, teamAwayName, timestamp };
      }
      Object.keys(odds).forEach(ior => {
        if (!oddsMap[ior]) {
          oddsMap[ior] = {};
        }
        oddsMap[ior][platform] = odds[ior]
      });
    });
    eventsMap['odds'] = oddsMap;
    return eventsMap;
  })
  .filter(item => item?.info);
}

export const eventsCombination = (passableEvents) => {
  const solutions = [];
  passableEvents.forEach(events => {
    const { odds, info } = events;
    Object.keys(iorKeys).forEach(iorGroup => {
      const rules = iorKeys[iorGroup];
      const optimalSelections = getOptimalSelections(odds, rules);
      optimalSelections.forEach(selection => {
        const { iors, rule, ruleIndex } = selection;
        const [, , , crossType] = rule;
        const [ oddsSideA, oddsSideB, oddsSideC ] = iors;
        const baseIndex = iors.reduce((minIdx, cur, idx) => cur.v < iors[minIdx].v ? idx : minIdx, 0);
        if (!oddsSideA || !oddsSideB || !oddsSideC) {
          return;
        }
        if (oddsSideA.v <= 1 || oddsSideB.v <= 1) {
          return;
        }
        const cpr = [oddsSideA, oddsSideB, oddsSideC];
        const betInfo = {
          cross_type: crossType,
          base_index: baseIndex,
          base_stake: 10000,
          odds_side_a: fixFloat(oddsSideA.v - 1),
          odds_side_b: fixFloat(oddsSideB.v - 1),
          odds_side_c: fixFloat(oddsSideC.v - 1),
        };
        const sol = eventSolutions(betInfo, true);
        if (cpr[2].k == '-') {
          cpr.pop();
        }
        if (!isNaN(sol?.win_average)) {
          const id = info.id;
          const keys = cpr.map(item => `${item.k}-${item.p}`).join('##');
          const sid = crypto.createHash('sha1').update(`${id}-${keys}`).digest('hex');
          const hasLower = cpr.some(item => item.q === 0);
          const platformKey = getPlatformKey(cpr);
          const timestamp = Date.now();
          solutions.push({sid, sol, cpr, cross: platformKey, info, lower: hasLower, rule: `${iorGroup}:${ruleIndex}`, timestamp});
        }
      });
    });
  });
  return solutions.sort((a, b) => b.sol.win_profit_rate - a.sol.win_profit_rate);
}