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uniswap.go
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uniswap.go
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package staking_factory
import (
"bytes"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/y2labs-0sh/dada-api/alchemy"
"github.com/y2labs-0sh/dada-api/box"
"github.com/y2labs-0sh/dada-api/erc20"
)
const uniswap_decimals = 18
func (u *UniswapV2) Stake(value *big.Int, amount *big.Int, userAddr common.Address, pool common.Address) (*stakeResult, error) {
const stakingFunc = "stake"
if value != nil {
return nil, fmt.Errorf("staking_factory::Uniswap: stake value must be nil")
}
abiParser, err := abi.JSON(bytes.NewReader(box.Get("raw_contract_abi/uniswap_staking.abi")))
if err != nil {
return nil, err
}
contractcall, err := abiParser.Pack(stakingFunc, amount)
if err != nil {
return nil, err
}
al, err := alchemy.NewAlchemy()
if err != nil {
return nil, err
}
_, stakingToken, err := al.UniswapV2RewardStakingToken(pool)
if err != nil {
return nil, err
}
allowance, err := al.ERC20Allowance(stakingToken, userAddr, pool)
if err != nil {
return nil, err
}
allowanceData := make([]byte, 0)
allowIsSatisfied := false
if allowance.Cmp(amount) >= 0 {
allowIsSatisfied = true
} else {
approveBytes, err := erc20.PackERC20Approve(pool, amount)
if err != nil {
return nil, err
}
allowanceData = approveBytes
}
return &stakeResult{
Data: contractcall,
ContractAddr: pool,
FromTokenAddr: stakingToken,
FromTokenAmount: amount,
Allowance: amount,
AllowanceSatisfied: allowIsSatisfied,
AllowanceData: allowanceData,
}, nil
}
func (u *UniswapV2) Exit(userAddr common.Address, pool common.Address) (*exitResult, error) {
const method = "exit"
abiParser, err := abi.JSON(bytes.NewReader(box.Get("raw_contract_abi/uniswap_staking.abi")))
if err != nil {
return nil, err
}
contractcall, err := abiParser.Pack(method)
if err != nil {
return nil, err
}
al, err := alchemy.NewAlchemy()
if err != nil {
return nil, err
}
rewardToken, stakingToken, err := al.UniswapV2RewardStakingToken(pool)
if err != nil {
return nil, err
}
rewards, err := al.ERC20BalanceOf(rewardToken, userAddr)
if err != nil {
return nil, err
}
stakingAmount, err := al.ERC20BalanceOf(pool, userAddr)
if err != nil {
return nil, err
}
return &exitResult{
Data: contractcall,
ContractAddr: pool,
StakingTokenAddr: stakingToken,
RewardTokenAddr: rewardToken,
WithdrawAmount: stakingAmount,
RewardAmount: rewards,
StakingDecimals: uniswap_decimals,
RewardDecimals: uniswap_decimals,
}, nil
}
func (u *UniswapV2) ClaimReward(userAddr common.Address, pool common.Address) (*claimRewardResult, error) {
const method = "getReward"
abiParser, err := abi.JSON(bytes.NewReader(box.Get("raw_contract_abi/uniswap_staking.abi")))
if err != nil {
return nil, err
}
contractcall, err := abiParser.Pack(method)
if err != nil {
return nil, err
}
al, err := alchemy.NewAlchemy()
if err != nil {
return nil, err
}
rewardToken, _, err := al.UniswapV2RewardStakingToken(pool)
if err != nil {
return nil, err
}
rewards, err := al.ERC20BalanceOf(rewardToken, userAddr)
if err != nil {
return nil, err
}
return &claimRewardResult{
Data: contractcall,
ContractAddr: pool,
RewardTokenAddr: rewardToken,
RewardAmount: rewards,
RewardDecimals: uniswap_decimals,
}, nil
}
// @param amount nil = withdraw all
func (u *UniswapV2) Withdraw(userAddr common.Address, pool common.Address, amount *big.Int) (*withdrawResult, error) {
const method = "withdraw"
abiParser, err := abi.JSON(bytes.NewReader(box.Get("raw_contract_abi/uniswap_staking.abi")))
if err != nil {
return nil, err
}
al, err := alchemy.NewAlchemy()
if err != nil {
return nil, err
}
if amount == nil {
var err error
if amount, err = al.ERC20BalanceOf(pool, userAddr); err != nil {
return nil, err
}
} else {
// make sure that user has staked equal to or more than this amount
stakedAmount, err := al.ERC20BalanceOf(pool, userAddr)
if err != nil {
return nil, err
}
if stakedAmount.Cmp(amount) < 0 {
return nil, fmt.Errorf("not enough staked balance")
}
}
contractcall, err := abiParser.Pack(method, amount)
if err != nil {
return nil, err
}
_, stakingToken, err := al.UniswapV2RewardStakingToken(pool)
if err != nil {
return nil, err
}
return &withdrawResult{
Data: contractcall,
ContractAddr: pool,
StakingTokenAddr: stakingToken,
WithdrawAmount: amount,
StakingDecimals: uniswap_decimals,
}, nil
}