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token.js
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token.js
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import ethers from 'ethers'
import Pair from './types/pair'
import ERC20_ABI from '../constants/abis/erc20'
import ERC20_BYTES32_ABI from '../constants/abis/erc20_bytes32'
import { USDD_ADDRESS, USDT_ADDRESS, FED_ADDRESS, FEDNAME, FED_DECIMALS, APPROVE_MAX, USDX_DECIMALS } from '../constants/index'
import { isAddress, getProviderOrSigner, calculateGasMargin, tryParseAmount } from '../utils/index'
import { getContract, getFactoryContract, getPairContract, getTokenContract, getUSDDContract } from './contract'
import { Token } from '@uniswap/sdk'
import TokenAmount from '../hooks/types/tokenAmount'
import { getNetworkId } from './wallet'
import { MaxUint256 } from '@ethersproject/constants'
// Get USDD token object without network.
export function getUSDDTokenStatic() {
return new Token(getNetworkId(), USDD_ADDRESS, USDX_DECIMALS, 'USDD', 'USDD')
}
// Get USDT token object without network.
export function getUSDTTokenStatic() {
return new Token(getNetworkId(), USDT_ADDRESS, USDX_DECIMALS, 'USDT', 'USDT')
}
// Get Fed token object without network.
export function getFedTokenStatic() {
return new Token(getNetworkId(), FED_ADDRESS, FED_DECIMALS, FEDNAME, FEDNAME)
}
// Get token info from network.
export async function getTokenDetails(chainId = 1, tokenAddress = USDD_ADDRESS) {
if (!isAddress(tokenAddress)) {
throw new Error('Invalid token address')
}
if (tokenAddress === USDD_ADDRESS) {
return getUSDDTokenStatic()
}
const name = await getTokenName(tokenAddress).catch(() => null)
const symbol = await getTokenSymbol(tokenAddress).catch(() => null)
const decimals = await getTokenDecimals(tokenAddress).catch(() => null)
return new Token(chainId, tokenAddress, decimals, symbol, name)
}
// Get pair info form network
export async function getPairFromToken(tokenA, tokenB, pairAddress = undefined) {
if (pairAddress === undefined) {
const tokenAmountA = tryParseAmount("0", tokenA)
const tokenAmountB = tryParseAmount("0", tokenB)
return new Pair(tokenAmountA, tokenAmountB)
}
const [reserves0, reserves1] = await getPairContract(pairAddress).getReserves()
const balances = [reserves0, reserves1]
return new Pair(new TokenAmount(tokenA, balances[0]), new TokenAmount(tokenB, balances[1]))
}
// get token name
export async function getTokenName(tokenAddress) {
if (!isAddress(tokenAddress)) {
throw Error(`Invalid 'tokenAddress' parameter '${tokenAddress}'.`)
}
return getContract(tokenAddress, ERC20_ABI)
.name()
.catch(() =>
getContract(tokenAddress, ERC20_BYTES32_ABI)
.name()
.then(bytes32 => ethers.utils.parseBytes32String(bytes32))
)
.catch(error => {
throw error
})
}
// get token symbol
export async function getTokenSymbol(tokenAddress) {
if (!isAddress(tokenAddress)) {
throw Error(`Invalid 'tokenAddress' parameter '${tokenAddress}'.`)
}
return getContract(tokenAddress, ERC20_ABI)
.symbol()
.catch(() => {
const contractBytes32 = getContract(tokenAddress, ERC20_BYTES32_ABI)
return contractBytes32.symbol().then(bytes32 => ethers.utils.parseBytes32String(bytes32))
})
.catch(error => {
throw error
})
}
// get token decimals
export async function getTokenDecimals(tokenAddress) {
if (!isAddress(tokenAddress)) {
throw Error(`Invalid 'tokenAddress' parameter '${tokenAddress}'.`)
}
return getContract(tokenAddress, ERC20_ABI)
.decimals()
.catch(error => {
throw error
})
}
// get the ether balance of an address
export async function getEtherBalance() {
const singer = getProviderOrSigner(true)
return singer.getBalance()
}
// get the token balance of an address
export async function getTokenBalance(tokenAddress, address) {
if (!isAddress(tokenAddress) || !isAddress(address)) {
throw Error(`Invalid 'tokenAddress' or 'address' parameter '${tokenAddress}' or '${address}'.`)
}
return getContract(tokenAddress, ERC20_ABI).balanceOf(address)
}
// Query allowance state
export async function getTokenAllowance(tokenAddress, userAddress, spenderAddress) {
if (!isAddress(userAddress) || !isAddress(tokenAddress) || !isAddress(spenderAddress)) {
throw Error(
"Invalid 'address' or 'tokenAddress' or 'spenderAddress' parameter" +
`'${userAddress}' or '${tokenAddress}' or '${spenderAddress}'.`
)
}
return getTokenContract(tokenAddress, false).allowance(userAddress, spenderAddress)
}
// Approve token
export async function approveToken(tokenAddress, spenderAddress, value) {
if (!isAddress(tokenAddress) || !isAddress(spenderAddress)) {
throw Error(
"Invalid 'address' or 'tokenAddress' or 'spenderAddress' parameter" +
`'${tokenAddress}' or '${spenderAddress}'.`
)
}
const approveVal = APPROVE_MAX ? MaxUint256 : value
const gas = await getTokenContract(tokenAddress, true).estimateGas.approve(spenderAddress, approveVal)
const gasLimit = calculateGasMargin(gas)
return getTokenContract(tokenAddress, true).approve(spenderAddress, approveVal, {
gasLimit: gasLimit
})
}
export async function convertUSDDToUSDT(amount) {
const contract = getUSDDContract(USDD_ADDRESS, true)
const gas = await contract.estimateGas.withdraw(amount)
const gasLimit = calculateGasMargin(gas)
return contract.withdraw(amount, {
gasLimit: gasLimit
})
}
export async function convertUSDTToUSDD(to, amount) {
const contract = getUSDDContract(USDD_ADDRESS, true)
const gas = await contract.estimateGas.deposit(to, amount)
const gasLimit = calculateGasMargin(gas)
return contract.deposit(to, amount, {
gasLimit: gasLimit
})
}
// Get all debts data
export async function getAllToken(networkId) {
const contract = getFactoryContract(networkId)
const logs = await contract.queryFilter("PairCreated")
const allTokens = {}
for (const l of logs) {
const data = l.args
allTokens[data.token] = {
name: data.symbol,
symbol: data.symbol,
decimals: data.decimals
}
}
return allTokens
}