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contract.go
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contract.go
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package staking
import (
"errors"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/functionx/fx-core/v7/x/evm/types"
)
type Contract struct {
ctx sdk.Context
bankKeeper BankKeeper
distrKeeper DistrKeeper
stakingKeeper StakingKeeper
evmKeeper EvmKeeper
}
func NewPrecompiledContract(
ctx sdk.Context,
bankKeeper BankKeeper,
stakingKeeper StakingKeeper,
distrKeeper DistrKeeper,
evmKeeper EvmKeeper,
) *Contract {
return &Contract{
ctx: ctx,
bankKeeper: bankKeeper,
stakingKeeper: stakingKeeper,
distrKeeper: distrKeeper,
evmKeeper: evmKeeper,
}
}
func (c *Contract) Address() common.Address {
return stakingAddress
}
func (c *Contract) IsStateful() bool {
return true
}
func (c *Contract) RequiredGas(input []byte) uint64 {
if len(input) <= 4 {
return 0
}
switch string(input[:4]) {
case string(DelegateMethod.ID):
return DelegateGas
case string(UndelegateMethod.ID):
return UndelegateGas
case string(RedelegateMethod.ID):
return RedelegateGas
case string(WithdrawMethod.ID):
return WithdrawGas
case string(DelegationMethod.ID):
return DelegationGas
case string(DelegationRewardsMethod.ID):
return DelegationRewardsGas
case string(TransferSharesMethod.ID):
return TransferSharesGas
case string(ApproveSharesMethod.ID):
return ApproveSharesGas
case string(AllowanceSharesMethod.ID):
return AllowanceSharesGas
case string(TransferFromSharesMethod.ID):
return TransferFromSharesGas
default:
return 0
}
}
func (c *Contract) Run(evm *vm.EVM, contract *vm.Contract, readonly bool) (ret []byte, err error) {
if len(contract.Input) <= 4 {
return types.PackRetError("invalid input")
}
cacheCtx, commit := c.ctx.CacheContext()
snapshot := evm.StateDB.Snapshot()
// parse input
switch string(contract.Input[:4]) {
case string(DelegateMethod.ID):
ret, err = c.Delegate(cacheCtx, evm, contract, readonly)
case string(UndelegateMethod.ID):
ret, err = c.Undelegate(cacheCtx, evm, contract, readonly)
case string(RedelegateMethod.ID):
ret, err = c.Redelegation(cacheCtx, evm, contract, readonly)
case string(WithdrawMethod.ID):
ret, err = c.Withdraw(cacheCtx, evm, contract, readonly)
case string(DelegationMethod.ID):
ret, err = c.Delegation(cacheCtx, evm, contract, readonly)
case string(DelegationRewardsMethod.ID):
ret, err = c.DelegationRewards(cacheCtx, evm, contract, readonly)
case string(TransferSharesMethod.ID):
ret, err = c.TransferShares(cacheCtx, evm, contract, readonly)
case string(ApproveSharesMethod.ID):
ret, err = c.ApproveShares(cacheCtx, evm, contract, readonly)
case string(AllowanceSharesMethod.ID):
ret, err = c.AllowanceShares(cacheCtx, evm, contract, readonly)
case string(TransferFromSharesMethod.ID):
ret, err = c.TransferFromShares(cacheCtx, evm, contract, readonly)
default:
err = errors.New("unknown method")
}
if err != nil {
// revert evm state
evm.StateDB.RevertToSnapshot(snapshot)
return types.PackRetError(err.Error())
}
// commit and append events
commit()
return ret, nil
}
func (c *Contract) AddLog(evm *vm.EVM, event abi.Event, topics []common.Hash, args ...interface{}) error {
data, newTopic, err := types.PackTopicData(event, topics, args...)
if err != nil {
return err
}
evm.StateDB.AddLog(ðtypes.Log{
Address: c.Address(),
Topics: newTopic,
Data: data,
BlockNumber: evm.Context.BlockNumber.Uint64(),
})
return nil
}