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Add PancakeSwap support to UniswapKit #163

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Feb 17, 2021
Merged

Add PancakeSwap support to UniswapKit #163

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8 changes: 5 additions & 3 deletions app/src/main/java/io/horizontalsystems/ethereumkit/sample/MainViewModel.kt
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Expand Up @@ -31,7 +31,7 @@ class MainViewModel : ViewModel() {
private val bscScanKey = "5ZGSHWYHZVA8XZHB8PF6UUTRNNB4KT43ZZ"
private val walletId = "walletId"
private val networkType: NetworkType = NetworkType.BscMainNet
private val webSocket = false
private val webSocket = true
private val words = "mom year father track attend frown loyal goddess crisp abandon juice roof".split(" ")

private val disposables = CompositeDisposable()
Expand Down Expand Up @@ -62,14 +62,16 @@ class MainViewModel : ViewModel() {
val swapStatus = SingleLiveEvent<Throwable?>()

val tokens = listOf(
Erc20Token("CAKE", "CAKE", Address("0x0e09fabb73bd3ade0a17ecc321fd13a19e81ce82"), 18),
Erc20Token("PancakeSwap", "CAKE", Address("0x0e09fabb73bd3ade0a17ecc321fd13a19e81ce82"), 18), //BEP20
Erc20Token("Beefy.Finance", "BIFI", Address("0xCa3F508B8e4Dd382eE878A314789373D80A5190A"), 18), //BEP20

Erc20Token("DAI", "DAI", Address("0xad6d458402f60fd3bd25163575031acdce07538d"), 18),
Erc20Token("GMO coins", "GMOLW", Address("0xbb74a24d83470f64d5f0c01688fbb49a5a251b32"), 18),
Erc20Token("USDT", "USDT", Address("0xdAC17F958D2ee523a2206206994597C13D831ec7"), 6),
Erc20Token("DAI-MAINNET", "DAI", Address("0x6b175474e89094c44da98b954eedeac495271d0f"), 18)
)
val fromToken: Erc20Token? = tokens[0]
val toToken: Erc20Token? = null//tokens[0]
val toToken: Erc20Token? = tokens[1]

fun init() {
ethereumKit = createKit()
Expand Down
15 changes: 8 additions & 7 deletions uniswapkit/src/main/java/io/horizontalsystems/uniswapkit/TokenFactory.kt
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@@ -1,10 +1,10 @@
package io.horizontalsystems.uniswapkit

import io.horizontalsystems.ethereumkit.core.EthereumKit
import io.horizontalsystems.ethereumkit.core.EthereumKit.NetworkType
import io.horizontalsystems.ethereumkit.models.Address
import io.horizontalsystems.uniswapkit.models.Token

class TokenFactory(networkType: EthereumKit.NetworkType) {
class TokenFactory(networkType: NetworkType) {
private val wethAddress = wethAddress(networkType)

fun etherToken(): Token {
Expand All @@ -16,12 +16,13 @@ class TokenFactory(networkType: EthereumKit.NetworkType) {
}

companion object {
private fun wethAddress(networkType: EthereumKit.NetworkType): Address {
private fun wethAddress(networkType: NetworkType): Address {
val wethAddressHex = when (networkType) {
EthereumKit.NetworkType.EthMainNet -> "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
EthereumKit.NetworkType.EthRopsten -> "0xc778417e063141139fce010982780140aa0cd5ab"
EthereumKit.NetworkType.EthKovan -> "0xd0A1E359811322d97991E03f863a0C30C2cF029C"
else -> "0xc778417e063141139fce010982780140aa0cd5ab"
NetworkType.EthMainNet -> "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
NetworkType.EthRopsten -> "0xc778417e063141139fce010982780140aa0cd5ab"
NetworkType.EthKovan -> "0xd0A1E359811322d97991E03f863a0C30C2cF029C"
NetworkType.EthRinkeby -> "0xc778417e063141139fce010982780140aa0cd5ab"
NetworkType.BscMainNet -> "0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c"
}
return Address(wethAddressHex)
}
Expand Down
24 changes: 17 additions & 7 deletions uniswapkit/src/main/java/io/horizontalsystems/uniswapkit/TradeManager.kt
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Expand Up @@ -2,9 +2,9 @@ package io.horizontalsystems.uniswapkit

import io.horizontalsystems.ethereumkit.contracts.ContractMethod
import io.horizontalsystems.ethereumkit.core.EthereumKit
import io.horizontalsystems.ethereumkit.core.EthereumKit.NetworkType
import io.horizontalsystems.ethereumkit.core.toHexString
import io.horizontalsystems.ethereumkit.models.Address
import io.horizontalsystems.ethereumkit.models.Transaction
import io.horizontalsystems.ethereumkit.models.TransactionData
import io.horizontalsystems.uniswapkit.contract.*
import io.horizontalsystems.uniswapkit.models.*
Expand All @@ -16,20 +16,22 @@ import java.util.*
import java.util.logging.Logger

class TradeManager(
private val ethereumKit: EthereumKit
private val evmKit: EthereumKit
) {
private val address: Address = ethereumKit.receiveAddress
private val address: Address = evmKit.receiveAddress
private val logger = Logger.getLogger(this.javaClass.simpleName)

val routerAddress: Address = getRouterAddress(evmKit.networkType)

fun pair(tokenA: Token, tokenB: Token): Single<Pair> {

val (token0, token1) = if (tokenA.sortsBefore(tokenB)) Pair(tokenA, tokenB) else Pair(tokenB, tokenA)

val pairAddress = Pair.address(token0, token1)
val pairAddress = Pair.address(token0, token1, evmKit.networkType)

logger.info("pairAddress: ${pairAddress.hex}")

return ethereumKit.call(pairAddress, GetReservesMethod().encodedABI())
return evmKit.call(pairAddress, GetReservesMethod().encodedABI())
.map { data ->
logger.info("getReserves data: ${data.toHexString()}")

Expand Down Expand Up @@ -59,7 +61,7 @@ class TradeManager(
fun estimateSwap(tradeData: TradeData, gasPrice: Long): Single<Long> {
val swapData = buildSwapData(tradeData)

return ethereumKit.estimateGas(
return evmKit.estimateGas(
to = routerAddress,
value = if (swapData.amount == BigInteger.ZERO) null else swapData.amount,
gasPrice = gasPrice,
Expand Down Expand Up @@ -139,7 +141,15 @@ class TradeManager(
}

companion object {
val routerAddress = Address("0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D")

private fun getRouterAddress(networkType: NetworkType) =
when (networkType) {
NetworkType.EthMainNet,
NetworkType.EthRopsten,
NetworkType.EthKovan,
NetworkType.EthRinkeby -> Address("0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D")
NetworkType.BscMainNet -> Address("0x05fF2B0DB69458A0750badebc4f9e13aDd608C7F")
}

fun tradeExactIn(pairs: List<Pair>, tokenAmountIn: TokenAmount, tokenOut: Token, maxHops: Int = 3, currentPairs: List<Pair> = listOf(), originalTokenAmountIn: TokenAmount? = null): List<Trade> {
//todo validations
Expand Down
2 changes: 1 addition & 1 deletion uniswapkit/src/main/java/io/horizontalsystems/uniswapkit/UniswapKit.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ class UniswapKit(
private val logger = Logger.getLogger(this.javaClass.simpleName)

val routerAddress: Address
get() = TradeManager.routerAddress
get() = tradeManager.routerAddress

fun etherToken(): Token {
return tokenFactory.etherToken()
Expand Down
24 changes: 21 additions & 3 deletions uniswapkit/src/main/java/io/horizontalsystems/uniswapkit/models/Pair.kt
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
package io.horizontalsystems.uniswapkit.models

import io.horizontalsystems.ethereumkit.core.EthereumKit.NetworkType
import io.horizontalsystems.ethereumkit.core.hexStringToByteArray
import io.horizontalsystems.ethereumkit.crypto.CryptoUtils
import io.horizontalsystems.ethereumkit.models.Address
Expand Down Expand Up @@ -81,11 +82,28 @@ class Pair(
}

companion object {
fun address(token0: Token, token1: Token): Address {
fun address(token0: Token, token1: Token, networkType: NetworkType): Address {
val factoryAddress: String
val initCodeHash: String

when (networkType) {
NetworkType.EthMainNet,
NetworkType.EthRopsten,
NetworkType.EthKovan,
NetworkType.EthRinkeby -> {
factoryAddress = "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f"
initCodeHash = "0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f"
}
NetworkType.BscMainNet -> {
factoryAddress = "0xBCfCcbde45cE874adCB698cC183deBcF17952812"
initCodeHash = "0xd0d4c4cd0848c93cb4fd1f498d7013ee6bfb25783ea21593d5834f5d250ece66"
}
}

val data = "0xff".hexStringToByteArray() +
"0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f".hexStringToByteArray() +
factoryAddress.hexStringToByteArray() +
CryptoUtils.sha3(token0.address.raw + token1.address.raw) +
"0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f".hexStringToByteArray()
initCodeHash.hexStringToByteArray()

return Address(CryptoUtils.sha3(data).copyOfRange(12, 32))
}
Expand Down