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55 lines
1.2 KiB
55 lines
1.2 KiB
const log = require('loglevel')
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const util = require('./util')
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const BigNumber = require('bignumber.js')
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function tokenInfoGetter () {
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const tokens = {}
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return async (address) => {
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if (tokens[address]) {
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return tokens[address]
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}
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tokens[address] = await getSymbolAndDecimals(address)
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return tokens[address]
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}
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}
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async function getSymbolAndDecimals (tokenAddress, existingTokens = []) {
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const existingToken = existingTokens.find(({ address }) => tokenAddress === address)
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if (existingToken) {
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return existingToken
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}
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let result = []
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try {
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const token = util.getContractAtAddress(tokenAddress)
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result = await Promise.all([
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token.symbol(),
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token.decimals(),
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])
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} catch (err) {
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log.warn(`symbol() and decimal() calls for token at address ${tokenAddress} resulted in error:`, err)
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}
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const [ symbol = [], decimals = [] ] = result
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return {
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symbol: symbol[0] || null,
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decimals: decimals[0] && decimals[0].toString() || null,
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}
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}
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function calcTokenAmount (value, decimals) {
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const multiplier = Math.pow(10, Number(decimals || 0))
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return new BigNumber(value).div(multiplier).toString()
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}
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module.exports = {
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tokenInfoGetter,
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calcTokenAmount,
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getSymbolAndDecimals,
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}
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