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transfer_shares.go
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/
transfer_shares.go
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package staking
import (
"errors"
"fmt"
"math/big"
sdkmath "cosmossdk.io/math"
"github.com/armon/go-metrics"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
distrtypes "github.com/cosmos/cosmos-sdk/x/distribution/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"
"github.com/functionx/fx-core/v5/x/evm/types"
fxstakingtypes "github.com/functionx/fx-core/v5/x/staking/types"
)
func (c *Contract) TransferShares(ctx sdk.Context, evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
if readonly {
return nil, errors.New("transfer method not readonly")
}
// parse args
var args TransferSharesArgs
if err := types.ParseMethodArgs(TransferSharesMethod, &args, contract.Input[4:]); err != nil {
return nil, err
}
valAddr := args.GetValidator()
token, reward, err := c.handlerTransferShares(ctx, evm, valAddr, contract.Caller(), args.To, args.Shares)
if err != nil {
return nil, err
}
ctx.EventManager().EmitEvents(sdk.Events{
sdk.NewEvent(
sdk.EventTypeMessage,
sdk.NewAttribute(sdk.AttributeKeyModule, evmtypes.ModuleName),
sdk.NewAttribute(sdk.AttributeKeySender, sdk.AccAddress(contract.Caller().Bytes()).String()),
),
})
return TransferSharesMethod.Outputs.Pack(token, reward)
}
func (c *Contract) TransferFromShares(ctx sdk.Context, evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
if readonly {
return nil, errors.New("transferFrom method not readonly")
}
// parse args
var args TransferFromSharesArgs
if err := types.ParseMethodArgs(TransferFromSharesMethod, &args, contract.Input[4:]); err != nil {
return nil, err
}
valAddr := args.GetValidator()
spender := contract.Caller()
if err := c.decrementAllowance(ctx, valAddr, args.From.Bytes(), spender.Bytes(), args.Shares); err != nil {
return nil, err
}
token, reward, err := c.handlerTransferShares(ctx, evm, valAddr, args.From, args.To, args.Shares)
if err != nil {
return nil, err
}
ctx.EventManager().EmitEvents(sdk.Events{
sdk.NewEvent(
sdk.EventTypeMessage,
sdk.NewAttribute(sdk.AttributeKeyModule, evmtypes.ModuleName),
sdk.NewAttribute(sdk.AttributeKeySender, sdk.AccAddress(contract.Caller().Bytes()).String()),
),
})
return TransferFromSharesMethod.Outputs.Pack(token, reward)
}
func (c *Contract) decrementAllowance(ctx sdk.Context, valAddr sdk.ValAddress, owner, spender sdk.AccAddress, decrease *big.Int) error {
allowance := c.stakingKeeper.GetAllowance(ctx, valAddr, owner, spender)
if allowance.Cmp(decrease) < 0 {
return fmt.Errorf("transfer shares exceeds allowance(%s < %s)", allowance.String(), decrease.String())
}
newAllowance := big.NewInt(0).Sub(allowance, decrease)
c.stakingKeeper.SetAllowance(ctx, valAddr, owner, spender, newAllowance)
return nil
}
func (c *Contract) handlerTransferShares(
ctx sdk.Context,
evm *vm.EVM,
valAddr sdk.ValAddress,
from, to common.Address,
sharesInt *big.Int,
) (*big.Int, *big.Int, error) {
validator, found := c.stakingKeeper.GetValidator(ctx, valAddr)
if !found {
return nil, nil, fmt.Errorf("validator not found: %s", valAddr.String())
}
fromDel, found := c.stakingKeeper.GetDelegation(ctx, from.Bytes(), valAddr)
if !found {
return nil, nil, errors.New("from delegation not found")
}
// if from has receiving redelegation, can't transfer shares
if c.stakingKeeper.HasReceivingRedelegation(ctx, from.Bytes(), valAddr) {
return nil, nil, errors.New("from has receiving redelegation")
}
shares := sdk.NewDecFromBigInt(sharesInt) // TODO share with sdk.Precision
if fromDel.GetShares().LT(shares) {
return nil, nil, fmt.Errorf("insufficient shares(%s < %s)", fromDel.GetShares().TruncateInt().String(), shares.TruncateInt().String())
}
// withdraw reward
evmDenom := c.evmKeeper.GetParams(ctx).EvmDenom
_, err := c.withdraw(ctx, evm, from, valAddr, evmDenom)
if err != nil {
return nil, nil, fmt.Errorf("withdraw failed: %s", err.Error())
}
// get to delegation
toReward := big.NewInt(0)
toDel, toDelFound := c.stakingKeeper.GetDelegation(ctx, to.Bytes(), valAddr)
if !toDelFound {
toDel = stakingtypes.NewDelegation(to.Bytes(), valAddr, sdk.ZeroDec())
// if address to not delegate before, increase validator period
_ = c.distrKeeper.IncrementValidatorPeriod(ctx, validator)
} else {
// withdraw to address reward
toReward, err = c.withdraw(ctx, evm, to, valAddr, evmDenom)
if err != nil {
return nil, nil, fmt.Errorf("withdraw failed: %s", err.Error())
}
}
// update from delegate, delete it if shares zero
fromDelStartingInfo := c.distrKeeper.GetDelegatorStartingInfo(ctx, valAddr, from.Bytes())
fromDel.Shares = fromDel.Shares.Sub(shares)
if fromDel.GetShares().IsZero() {
// if shares zero, remove delegation and delete starting info and reference count
if err := c.stakingKeeper.RemoveDelegation(ctx, fromDel); err != nil {
return nil, nil, err
}
// decrement previous period reference count
decrementReferenceCount(c.distrKeeper, ctx, valAddr, fromDelStartingInfo.PreviousPeriod)
c.distrKeeper.DeleteDelegatorStartingInfo(ctx, valAddr, from.Bytes())
} else {
c.stakingKeeper.SetDelegation(ctx, fromDel)
// update from starting info
fromDelStartingInfo.Stake = validator.TokensFromSharesTruncated(fromDel.GetShares())
c.distrKeeper.SetDelegatorStartingInfo(ctx, valAddr, from.Bytes(), fromDelStartingInfo)
}
// update to delegate, set starting info if to not delegate before
toDel.Shares = toDel.Shares.Add(shares)
c.stakingKeeper.SetDelegation(ctx, toDel)
if !toDelFound {
// if to not delegate before, last period reference count - 1 and set starting info
previousPeriod := c.distrKeeper.GetValidatorCurrentRewards(ctx, valAddr).Period - 1
incrementReferenceCount(c.distrKeeper, ctx, valAddr, previousPeriod)
stakeToken := validator.TokensFromSharesTruncated(shares)
toDelStartingInfo := distrtypes.NewDelegatorStartingInfo(previousPeriod, stakeToken, uint64(ctx.BlockHeight()))
c.distrKeeper.SetDelegatorStartingInfo(ctx, valAddr, to.Bytes(), toDelStartingInfo)
} else {
// update to starting info
toDelStartingInfo := c.distrKeeper.GetDelegatorStartingInfo(ctx, valAddr, to.Bytes())
toDelStartingInfo.Stake = validator.TokensFromSharesTruncated(toDel.GetShares())
c.distrKeeper.SetDelegatorStartingInfo(ctx, valAddr, to.Bytes(), toDelStartingInfo)
}
// calculate token from shares
token := validator.TokensFromShares(shares).TruncateInt()
// add log
if err := c.AddLog(evm, TransferSharesEvent, []common.Hash{from.Hash(), to.Hash()},
valAddr.String(), shares.TruncateInt().BigInt(), token.BigInt()); err != nil {
return nil, nil, err
}
// add emit event
TransferSharesEmitEvents(ctx, valAddr, from.Bytes(), to.Bytes(), sdkmath.NewIntFromBigInt(sharesInt), token)
return token.BigInt(), toReward, nil
}
// increment the reference count for a historical rewards value
func incrementReferenceCount(k DistrKeeper, ctx sdk.Context, valAddr sdk.ValAddress, period uint64) {
historical := k.GetValidatorHistoricalRewards(ctx, valAddr, period)
if historical.ReferenceCount > 2 {
panic("reference count should never exceed 2")
}
historical.ReferenceCount++
k.SetValidatorHistoricalRewards(ctx, valAddr, period, historical)
}
// decrement the reference count for a historical rewards value, and delete if zero references remain
func decrementReferenceCount(k DistrKeeper, ctx sdk.Context, valAddr sdk.ValAddress, period uint64) {
historical := k.GetValidatorHistoricalRewards(ctx, valAddr, period)
if historical.ReferenceCount == 0 {
panic("cannot set negative reference count")
}
historical.ReferenceCount--
if historical.ReferenceCount == 0 {
k.DeleteValidatorHistoricalReward(ctx, valAddr, period)
} else {
k.SetValidatorHistoricalRewards(ctx, valAddr, period, historical)
}
}
func TransferSharesEmitEvents(ctx sdk.Context, validator sdk.ValAddress, from, recipient sdk.AccAddress, shares, token sdkmath.Int) {
if shares.IsInt64() {
defer func() {
telemetry.IncrCounter(1, evmtypes.ModuleName, "transfer_shares")
telemetry.SetGaugeWithLabels(
[]string{"tx", "msg", evmtypes.TypeMsgEthereumTx},
float32(shares.Int64()),
[]metrics.Label{telemetry.NewLabel("validator", validator.String())},
)
}()
}
ctx.EventManager().EmitEvents(sdk.Events{
sdk.NewEvent(
fxstakingtypes.EventTypeTransferShares,
sdk.NewAttribute(stakingtypes.AttributeKeyValidator, validator.String()),
sdk.NewAttribute(fxstakingtypes.AttributeKeyFrom, from.String()),
sdk.NewAttribute(fxstakingtypes.AttributeKeyRecipient, recipient.String()),
sdk.NewAttribute(fxstakingtypes.AttributeKeyShares, shares.String()),
sdk.NewAttribute(fxstakingtypes.AttributeKeyAmount, token.String()),
),
})
}