one/libs/token.js

const IERC20 = require("./web3/ierc20-token");
const { Level } = require("level");
const db = new Level('app.db', { valueEncoding: 'json' })

module.exports = class Token {
  exchange = {}
  ierc20 = {}

  orderPrice = 0
  orderAmount = 0
  nextHandleTime = 0

  constructor(exchangeSymbol, exchangePriceTick, exchangeLotSize, exchangePair, ierc20Decimals) {
    this.exchange.symbol = exchangeSymbol
    this.exchange.priceTick = exchangePriceTick
    this.exchange.lotSize = exchangeLotSize
    this.exchange.pair = exchangePair

    this.ierc20.decimals = ierc20Decimals
  }

  async save() {
    const localData = {
      orderPrice: this.orderPrice,
      orderAmount: this.orderAmount,
      nextHandleTime: this.nextHandleTime
    }

    await db.put(this.exchange.pair, JSON.stringify(localData))
  }

  async load() {
    try {
      const localDataJsonStr = await db.get(this.exchange.pair)
      const localData = JSON.parse(localDataJsonStr)

      this.orderAmount = localData.orderAmount
      this.orderPrice = localData.orderPrice
      this.nextHandleTime = localData.nextHandleTime
    } catch (e) {}
  }

  static async init(context, tokenHash, priceTickFilterMap, lotSizeFilterMap) {
    const config = context.config
    const logger = context.logger

    // token初始化
    const ierc20Decimals = parseInt(await IERC20.getDecimals(tokenHash))
    const exchangeSymbol = config.tokenMapping[tokenHash]
    const exchangePair = `${exchangeSymbol}${config.baseIerc20Token.symbol}`
    const exchangePriceTick = priceTickFilterMap[exchangePair]
    const exchangeLotSize = lotSizeFilterMap[exchangePair]

    const token = new Token(exchangeSymbol, exchangePriceTick, exchangeLotSize, exchangePair, ierc20Decimals)

    // 载入时持久化
    await token.load()

    context.tokenMap[tokenHash] = token

    logger.info(`${token.exchange.pair}初始化完毕，orderPrice:${token.orderPrice}, orderAmount:${token.orderAmount}.`)
  }

  static async batchInit(context, ierc20TokenAddressList, priceTickFilterMap, lotSizeFilterMap) {
    context.tokenMap = {}

    for (const tokenHash of ierc20TokenAddressList) {
      // 初始化token
      await Token.init(context, tokenHash, priceTickFilterMap, lotSizeFilterMap)
    }
  }
}