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undelegate.go
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undelegate.go
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package staking
import (
"errors"
"fmt"
"math/big"
"time"
sdkmath "cosmossdk.io/math"
"github.com/armon/go-metrics"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
evmtypes "github.com/evmos/ethermint/x/evm/types"
fxtypes "github.com/functionx/fx-core/v5/types"
"github.com/functionx/fx-core/v5/x/evm/types"
)
func (c *Contract) Undelegate(ctx sdk.Context, evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
if readonly {
return nil, errors.New("undelegate method not readonly")
}
// parse args
var args UndelegateArgs
err := types.ParseMethodArgs(UndelegateMethod, &args, contract.Input[4:])
if err != nil {
return nil, err
}
valAddr := args.GetValidator()
_, found := c.stakingKeeper.GetValidator(ctx, valAddr)
if !found {
return nil, fmt.Errorf("validator not found: %s", valAddr.String())
}
sender := sdk.AccAddress(contract.Caller().Bytes())
evmDenom := c.evmKeeper.GetParams(ctx).EvmDenom
// withdraw rewards if delegation exist, add reward to evm state balance
reward := big.NewInt(0)
if _, found = c.stakingKeeper.GetDelegation(ctx, sender, valAddr); found {
if reward, err = c.withdraw(ctx, evm, contract.Caller(), valAddr, evmDenom); err != nil {
return nil, err
}
}
unDelAmount, completionTime, err := Undelegate(ctx, c.stakingKeeper, c.bankKeeper, sender, valAddr, sdk.NewDecFromBigInt(args.Shares), evmDenom)
if err != nil {
return nil, fmt.Errorf("undelegate failed: %s", err.Error())
}
// add undelegate log
if err := c.AddLog(evm, UndelegateEvent, []common.Hash{contract.Caller().Hash()},
args.Validator, args.Shares, unDelAmount.BigInt(), big.NewInt(completionTime.Unix())); err != nil {
return nil, err
}
// add undelegate event
UndelegateEmitEvents(ctx, sender, valAddr, unDelAmount, completionTime)
return UndelegateMethod.Outputs.Pack(unDelAmount.BigInt(), reward, big.NewInt(completionTime.Unix()))
}
func Undelegate(ctx sdk.Context, sk StakingKeeper, bk BankKeeper, delAddr sdk.AccAddress,
valAddr sdk.ValAddress, shares sdk.Dec, bondDenom string,
) (sdkmath.Int, time.Time, error) {
validator, found := sk.GetValidator(ctx, valAddr)
if !found {
return sdkmath.Int{}, time.Time{}, stakingtypes.ErrNoDelegatorForAddress
}
if sk.HasMaxUnbondingDelegationEntries(ctx, delAddr, valAddr) {
return sdkmath.Int{}, time.Time{}, stakingtypes.ErrMaxUnbondingDelegationEntries
}
returnAmount, err := sk.Unbond(ctx, delAddr, valAddr, shares)
if err != nil {
return sdkmath.Int{}, time.Time{}, err
}
// transfer the validator tokens to the not bonded pool
if validator.IsBonded() {
coins := sdk.NewCoins(sdk.NewCoin(bondDenom, returnAmount))
if err := bk.SendCoinsFromModuleToModule(ctx, stakingtypes.BondedPoolName, stakingtypes.NotBondedPoolName, coins); err != nil {
return sdkmath.Int{}, time.Time{}, err
}
}
completionTime := ctx.BlockHeader().Time.Add(sk.UnbondingTime(ctx))
ubd := sk.SetUnbondingDelegationEntry(ctx, delAddr, valAddr, ctx.BlockHeight(), completionTime, returnAmount)
sk.InsertUBDQueue(ctx, ubd, completionTime)
return returnAmount, completionTime, nil
}
func UndelegateEmitEvents(ctx sdk.Context, delegator sdk.AccAddress, validator sdk.ValAddress, amount sdkmath.Int, completionTime time.Time) {
if amount.IsInt64() {
defer func() {
telemetry.IncrCounter(1, evmtypes.ModuleName, "undelegate")
telemetry.SetGaugeWithLabels(
[]string{"tx", "msg", evmtypes.TypeMsgEthereumTx},
float32(amount.Int64()),
[]metrics.Label{telemetry.NewLabel("denom", fxtypes.DefaultDenom)},
)
}()
}
ctx.EventManager().EmitEvents(sdk.Events{
sdk.NewEvent(
stakingtypes.EventTypeUnbond,
sdk.NewAttribute(stakingtypes.AttributeKeyValidator, validator.String()),
sdk.NewAttribute(sdk.AttributeKeyAmount, amount.String()),
sdk.NewAttribute(stakingtypes.AttributeKeyCompletionTime, completionTime.Format(time.RFC3339)),
),
sdk.NewEvent(
sdk.EventTypeMessage,
sdk.NewAttribute(sdk.AttributeKeyModule, evmtypes.ModuleName),
sdk.NewAttribute(sdk.AttributeKeySender, delegator.String()),
),
})
}