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gov.go
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gov.go
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package gov
import (
"bytes"
"embed"
"errors"
"fmt"
"math/big"
sdk "github.com/cosmos/cosmos-sdk/types"
govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
pcommon "github.com/sei-protocol/sei-chain/precompiles/common"
"github.com/sei-protocol/sei-chain/x/evm/state"
)
const (
VoteMethod = "vote"
DepositMethod = "deposit"
)
const (
GovAddress = "0x0000000000000000000000000000000000001006"
)
var _ vm.PrecompiledContract = &Precompile{}
// Embed abi json file to the executable binary. Needed when importing as dependency.
//
//go:embed abi.json
var f embed.FS
func GetABI() abi.ABI {
abiBz, err := f.ReadFile("abi.json")
if err != nil {
panic(err)
}
newAbi, err := abi.JSON(bytes.NewReader(abiBz))
if err != nil {
panic(err)
}
return newAbi
}
type Precompile struct {
pcommon.Precompile
govKeeper pcommon.GovKeeper
evmKeeper pcommon.EVMKeeper
bankKeeper pcommon.BankKeeper
address common.Address
VoteID []byte
DepositID []byte
}
func NewPrecompile(govKeeper pcommon.GovKeeper, evmKeeper pcommon.EVMKeeper, bankKeeper pcommon.BankKeeper) (*Precompile, error) {
newAbi := GetABI()
p := &Precompile{
Precompile: pcommon.Precompile{ABI: newAbi},
govKeeper: govKeeper,
evmKeeper: evmKeeper,
address: common.HexToAddress(GovAddress),
bankKeeper: bankKeeper,
}
for name, m := range newAbi.Methods {
switch name {
case VoteMethod:
p.VoteID = m.ID
case DepositMethod:
p.DepositID = m.ID
}
}
return p, nil
}
// RequiredGas returns the required bare minimum gas to execute the precompile.
func (p Precompile) RequiredGas(input []byte) uint64 {
methodID, err := pcommon.ExtractMethodID(input)
if err != nil {
return pcommon.UnknownMethodCallGas
}
if bytes.Equal(methodID, p.VoteID) {
return 30000
} else if bytes.Equal(methodID, p.DepositID) {
return 30000
}
// This should never happen since this is going to fail during Run
return pcommon.UnknownMethodCallGas
}
func (p Precompile) Address() common.Address {
return p.address
}
func (p Precompile) GetName() string {
return "gov"
}
func (p Precompile) Run(evm *vm.EVM, caller common.Address, callingContract common.Address, input []byte, value *big.Int, readOnly bool) (bz []byte, err error) {
defer func() {
if err != nil {
evm.StateDB.(*state.DBImpl).SetPrecompileError(err)
}
}()
if readOnly {
return nil, errors.New("cannot call gov precompile from staticcall")
}
ctx, method, args, err := p.Prepare(evm, input)
if err != nil {
return nil, err
}
if caller.Cmp(callingContract) != 0 {
return nil, errors.New("cannot delegatecall gov")
}
switch method.Name {
case VoteMethod:
return p.vote(ctx, method, caller, args, value)
case DepositMethod:
return p.deposit(ctx, method, caller, args, value)
}
return
}
func (p Precompile) vote(ctx sdk.Context, method *abi.Method, caller common.Address, args []interface{}, value *big.Int) ([]byte, error) {
if err := pcommon.ValidateNonPayable(value); err != nil {
return nil, err
}
if err := pcommon.ValidateArgsLength(args, 2); err != nil {
return nil, err
}
voter, found := p.evmKeeper.GetSeiAddress(ctx, caller)
if !found {
return nil, fmt.Errorf("voter %s is not associated", caller.Hex())
}
proposalID := args[0].(uint64)
voteOption := args[1].(int32)
err := p.govKeeper.AddVote(ctx, proposalID, voter, govtypes.NewNonSplitVoteOption(govtypes.VoteOption(voteOption)))
if err != nil {
return nil, err
}
return method.Outputs.Pack(true)
}
func (p Precompile) deposit(ctx sdk.Context, method *abi.Method, caller common.Address, args []interface{}, value *big.Int) ([]byte, error) {
if err := pcommon.ValidateArgsLength(args, 1); err != nil {
return nil, err
}
depositor, found := p.evmKeeper.GetSeiAddress(ctx, caller)
if !found {
return nil, fmt.Errorf("depositor %s is not associated", caller.Hex())
}
proposalID := args[0].(uint64)
if value == nil || value.Sign() == 0 {
return nil, errors.New("set `value` field to non-zero to deposit fund")
}
coin, err := pcommon.HandlePaymentUsei(ctx, p.evmKeeper.GetSeiAddressOrDefault(ctx, p.address), depositor, value, p.bankKeeper)
if err != nil {
return nil, err
}
res, err := p.govKeeper.AddDeposit(ctx, proposalID, depositor, sdk.NewCoins(coin))
if err != nil {
return nil, err
}
return method.Outputs.Pack(res)
}